The proton exchange membrane fuel cell(PEMFC)and the hydrogen hybrid power system are studied by the fuzzy-PID(FPID)controlmethod and the fuzzy-PID controlmethod by Artificial Bee Colony algorithm(ABCFPID),respectivel...The proton exchange membrane fuel cell(PEMFC)and the hydrogen hybrid power system are studied by the fuzzy-PID(FPID)controlmethod and the fuzzy-PID controlmethod by Artificial Bee Colony algorithm(ABCFPID),respectively.The results reveal that compared with the FPID control method,the temperature overshoot of the PEMFC stack under the ABC-FPID control method is decreased by 0.6%.Moreover,the circulating water flow rate within the full operating envelope(about 3 min)is reduced by 19.46 L,which means the ABC-FPID control method is more effective in regulating the stack temperature.Then,the ABC-FPID control method is proposed to study the hydrogen hybrid power system,and the system output power matching,operating characteristic curve of the fuel cell,state of charge(SOC)of the lithium battery,system efficiency and hydrogen demand are obtained.The results indicate that the maximum system efficiency reaches 46.3%,the average system efficiency is 33.8%,and the average hydrogen demand is 0.192 kg/s.Overall,the ABC-FPID control method can efficiently ensure the stability of the fuel cell’s output power,and actively prompt the lithium battery to fulfill the function of“peak shaving and valley filling”under variable load power conditions.展开更多
The forming process and influencing factors of laser forming of TA15 titanium alloy sheet metal are researched.The effects of line energy and area energy on sheet metal bending were notable.The bending rate did not in...The forming process and influencing factors of laser forming of TA15 titanium alloy sheet metal are researched.The effects of line energy and area energy on sheet metal bending were notable.The bending rate did not increase linearly with line energy rising.When the line energy increased to a certain value,the bending rate decreased gradually for material surface melting.The influence of sheet thickness on laser forming was also studied.Compared with 3mm sheet,1.5mm sheet was bended easily and more sensitive to the parameters.The metallurgical structure showed that the structure of heating area was divided into fusion zone,heat affected zone and intermediate zone.展开更多
Shut-in after fracturing has become an important supporting technology for volume fracturing in unconventional oil and gas wells, which is helpful for gas and water imbibition replacement to increase single well produ...Shut-in after fracturing has become an important supporting technology for volume fracturing in unconventional oil and gas wells, which is helpful for gas and water imbibition replacement to increase single well production. In this paper, the hydraulic pressure, capillary pressure and osmotic pressure, the three main forces that affect well production, are calculated and compared in the Sulige tight sandstone gas field and Fuling shale gas field. The results show that the total forces affecting well production in the Sulige gas field are similar to those in the Fuling shale gas field, and it has the potential to exhibit shut-in after fracturing. For the characteristics of “low pressure” and “water blocking risk” in Sulige gas field, it is suggested that:(1)injecting N_(2) or CO_(2) during hydraulic fracturing and reasonably controlling the shut-in time after fracturing, such as shut-in for approximately 30 h, can ensure effective natural fluid flowback while replenishing energy to the formation and reduce the damage caused by water blocking and (2)the waterproof lock slickwater is used in the test wells, and the result shows that slickwater can reduce the reservoir damage and increase well production when compared with guanidine gum fracturing fluid. This research can provide some basis and reference for the field test of shut-in after fracturing in the Sulige tight sandstone gas field.展开更多
The emergence of new media in various fields has continuously strengthened the social aspect of social media.Netizens tend to express emotions in social interactions,and many people even use satire,metaphors,and other...The emergence of new media in various fields has continuously strengthened the social aspect of social media.Netizens tend to express emotions in social interactions,and many people even use satire,metaphors,and other techniques to express some negative emotions,it is necessary to detect sarcasm in social comment data.For sarcasm,the more reference data modalities used,the better the experimental effect.This paper conducts research on sarcasm detection technology based on image-text fusion data.To effectively utilize the features of each modality,a feature reconstruction output algorithm is proposed.This algorithm is based on the attention mechanism,learns the low-rank features of another modality through cross-modality,the eigenvectors are reconstructed for the corresponding modality through weighted averaging.When only the image modality in the dataset is used,the preprocessed data has outstanding performance in reconstructing the output model,with an accuracy rate of 87.6%.When using only the text modality data in the dataset,the reconstructed output model is optimal,with an accuracy rate of 85.2%.To improve feature fusion between modalities for effective classification,a weight adaptive learning algorithm is used.This algorithm uses a neural network combined with an attention mechanism to calculate the attention weight of each modality to achieve weight adaptive learning purposes,with an accuracy rate of 87.9%.Extensive experiments on a benchmark dataset demonstrate the superiority of our proposed model.展开更多
Wu Chunsheng is a senior engineer of oil and gas field development,and the deputy director of the Oil Production Technology Research Institute of the No.10 Oil Production Plant of PetroChina Changqing Oilfield Company...Wu Chunsheng is a senior engineer of oil and gas field development,and the deputy director of the Oil Production Technology Research Institute of the No.10 Oil Production Plant of PetroChina Changqing Oilfield Company.He has devoted himself to working in the field of oilfield development technology since the very beginning of his career.During the period of"Building a Western Daqing Oilfield"and the"Second Round of Development Acceleration"in Changqing Oilfield,he worked hard and studied diligently,and took the initiative to take on responsibilities while focused on practical work,growing into an outstanding young technical cadre step by step.His achievements in the research,application,promotion of new techniques and technologies,and the application of scientific research results proved extraordinary.展开更多
At present, the layering technology of water injection wells in Shengli Offshore Oilfield suffers from poor sealing, wear and tear of rubber parts, and corrosion and perforation of tubing, which seriously affect the n...At present, the layering technology of water injection wells in Shengli Offshore Oilfield suffers from poor sealing, wear and tear of rubber parts, and corrosion and perforation of tubing, which seriously affect the normal production of oil wells. To this end, the efficient stratification technology of water injection wells is studied, which has the control of all hydraulic control systems in addition to the water distributor. Hydraulic control washable annular safety packer, one-time pressure, permanent locking;hydraulic control forcibly opens and closes the well washing channel to avoid polluting the marine ecological environment. The double-sealing structure design of the hydraulic-controlled repeating packer effectively expands the axial sealing area. The hydraulically controlled two-way well flushing valve realizes forward and reverse well flushing and improves well flushing efficiency. The connection between the hydraulic control system and the ground hydraulic control cabinet realizes the remote control of the underground hydraulic control tool by the office computer terminal system, reduces the labor intensity of post-maintenance, and solves the problem of operating safety for on-site personnel. By the end of 2020, the high-efficiency stratification technology of water injection wells had been applied in more than 140 wells in Chengdao Oilfield, and the longest validity period had reached 7.6 years. The overall practical life of the pipe string could effectively meet the 5-year efficient development requirements.展开更多
Aiming at the problems that there are a lot of dead oil, wax and other pollutants in the casing wall, perforation hole and near-well zone of oil wells, which result in the limited flow capacity of oil wells and the de...Aiming at the problems that there are a lot of dead oil, wax and other pollutants in the casing wall, perforation hole and near-well zone of oil wells, which result in the limited flow capacity of oil wells and the decrease of production wells, the high-pressure jet compound plugging removal technology is studied. This technology has formed a composite plugging removal technique of vertical well and long well section segmented jet cleaning+chemical plugging removal, horizontal well segmented acidizing+foam mixed discharge cleaning and high pressure jet, which is suitable for Gaosheng Oilfields extremely thick and low permeability reservoir, and provides a strong technical guarantee for the efficient development of Gaosheng low permeability and extremely thick reservoir. It also provides a powerful technical reference for plugging removal of oil and water wells in other similar reservoirs, and has a good popularization and application prospect [1].展开更多
The substantial emissions of greenhouse gases,particularly CO_(2),constitute a primary driver of global warming.CCUS is proposed as an effective mitigation strategy which is often estimated to account for about 15%of ...The substantial emissions of greenhouse gases,particularly CO_(2),constitute a primary driver of global warming.CCUS is proposed as an effective mitigation strategy which is often estimated to account for about 15%of cumulative carbon emission reduction.In-situ CO_(2) mineralization sequestration,compared to conventional geological storage methods such as depleted oil and gas reservoirs,unmineable coal seams,and deep saline aquifers,offers the advantage of permanent immobilization of injected carbon.However,uncertainties persist regarding the characteristics of geochemical interactions under reservoir pore conditions,as well as the kinetic mechanisms of mineralization reactions.Additionally,geochemical reactions may lead to solid particle transport and deposition,potentially causing pore throat occlusion.Pilot projects in Iceland and the United States have demonstrated the feasibility of this technology,but the field remains in the early deployment stage.In this review,the mechanisms of in-situ mineralization have been elucidated,the primary factors influencing the reaction kinetics have been discussed,and the current research status in this field has been summarized.It is emphasized that establishing a reliable system for evaluating storage capacity and understanding the kinetic mechanisms governing CO_(2) conversion into minerals at multi-phase interfaces are key priorities for future work.展开更多
Horizontal shale gas well fracturing is mostly carried out by pumping bridge plugs.In the case of casing deformation,the bridge plug can not be pumped down to the designated position,so the hole sections below the def...Horizontal shale gas well fracturing is mostly carried out by pumping bridge plugs.In the case of casing deformation,the bridge plug can not be pumped down to the designated position,so the hole sections below the deformation could not be stimulated according to the design program.About 30%of horizontal shale gas wells in the Changning and Weiyuan Blocks,Sichuan Basin,suffer various casing deformation after fracturing.Previously,the hole sections which could not be stimulated due to casing deformation were generally abandoned.As a result,the resources controlled by shale gas wells weren't exploited effectively and the fracturing effect was impacted greatly.There are a lot of difficulties in investigating casing deformation,such as complex mechanisms,various influencing factors and unpredictable deformation time.Therefore,it is especially important to seek a staged fracturing technology suitable for the casing deformation sections.In this paper,the staged fracturing technology with sand plugs inside fractures and the staged fracturing technology with temporary plugging balls were tested in casing deformation wells.The staged fracturing technology with sand plugs inside fractures was carried out in the mode of single-stage perforation and single-stage fracturing.The staged fracturing technology with temporary plugging balls was conducted in the mode of single perforation,continuous fracturing and staged ball dropping.Then,two kinds of technologies were compared in terms of their advantages and disadvantages.Finally,they were tested on site.According to the pressure response,the pressure monitoring of the adjacent wells and the microseismic monitoring in the process of actual fracturing,both technologies are effective in the stimulation of the casing deformation sections,realizing well control reserves efficiently and guaranteeing fracturing effects.展开更多
In recent years,shale oil and gas development has been thriving in China.However,the shale oil and gas production always suffers a rapid decline.Based on the analysis of a large amount of former theories and experienc...In recent years,shale oil and gas development has been thriving in China.However,the shale oil and gas production always suffers a rapid decline.Based on the analysis of a large amount of former theories and experiences,a summary of acid treatment stimulation methods in shale oil and gas is presented,and the acid stimulation mechanism is analyzed.The mainstream technique in acid treatments includes:acid wash,matrix acidizing,prop fracturing with acid preflush,and multi-stage alternate-inject acid fracturing.The main stimulation mechanism of acid treatment can be summarized into 3 categories:a)the influence on shale matrix,namely the acid-induced increase of porosity and permeability,and reduce of wetting property of shale;b)the influence on rock mechanical properties,namely shale brittleness and toughness,and even Young Modulus to some degree;c)the influence on fractures'conductivity,caused by the fact that acid dissolves calcite-enrichment area in priority,and then increases roughness on fracture surface.In room temperature and atmospheric pressure,acid reduces fractures'conductivity,while in pressurized condition,the acid-soaked fractures'conductivity is higher than the conductivity of non-acid-soaked fractures.These knowledges would provide useful reference for furthering stimulation techniques and processes in shale oil and gas development.展开更多
The treatment of soil pollution is very difficult, and it is faced with such difficult problems as high cost, long period and great difficulty. In this paper, the causes and types of soil pollution and the remediation...The treatment of soil pollution is very difficult, and it is faced with such difficult problems as high cost, long period and great difficulty. In this paper, the causes and types of soil pollution and the remediation technologies of contaminated soil are introduced. Based on different principles, the research and application status and progress of biological, chemical and physical remediation technologies are reviewed, and the research and application of numerical simulation in soil remediation are introduced. Looking forward to the development of soil remediation technology, on the one hand, it is necessary to build a soil environmental management system, on the other hand, it is necessary to increase the research on the technical mechanism and numerical simulation to promote the high-level development of the industry.展开更多
Transformation of urea and glycerol to glycerol carbonate is an environmental friendly and economical process.Catalysts play an indispensable role in the process.Although many catalysts have been developed,the perform...Transformation of urea and glycerol to glycerol carbonate is an environmental friendly and economical process.Catalysts play an indispensable role in the process.Although many catalysts have been developed,the performance of the catalysts still cannot meet the needs of industrialization.In this paper,research progress of the homogeneous and heterogeneous catalysts of the reaction over the past 20 years were reviewed systematically.According to the types and active centers of catalysts,the catalysts were classified systematically and analyzed in detail.The typical reaction mechanisms were also summarized.The research and development direction of catalysts is made more explicit through systematic classification and mechanism analysis.The article reveals more novel catalysts have been designed and used for the reaction,such as mixed metal oxides with special structures,solid wastes and non-metallic materials.This work summarized the current state of research and prospected possible routes for design of novel catalysts.It is hoped that this review can provide some references for developing efficient catalysts.展开更多
This paper discusses the importance of standards in the fire extinguishing agent industry,and highlights the vital role of the standards in promoting technological innovation.China’s standards for fire extinguishing ...This paper discusses the importance of standards in the fire extinguishing agent industry,and highlights the vital role of the standards in promoting technological innovation.China’s standards for fire extinguishing agent products have evolved significantly,aligning with industrial development,market demands,regulatory requirements,to respond to the great impact of international competition in the industry.The paper analyzes the current state of China’s standards,including their composition and integration with industry growth,green development strategies,and international harmonization.Future development strategies for the standards framework should focus on valid period estimation,fire test model development,and raw material selection guidelines.By implementing these strategies,China’s fire protection industry can enhance product quality,contribute to public safety,and maintain a competitive edge in the global market.展开更多
To address the challenges of insufficient visualization in the industrial robot assembly operation system and the limitation of visualizing only geometric attributes of physical properties,a method is proposed for con...To address the challenges of insufficient visualization in the industrial robot assembly operation system and the limitation of visualizing only geometric attributes of physical properties,a method is proposed for constructing an industrial robot assembly system based on virtual reality technology.Focusing on the shaft hole assembly,the mechanical characteristics of the industrial robot shaft hole assembly process are analyzed and a dynamic model is established for shaft hole assembly operations.The key elements of virtual assembly operations for industrial robots are summarized and a five-dimensional model is proposed for industrial robot virtual operations.Utilizing the Unity3D engine based on the 5-D model for industrial robot virtual operations,an industrial robot shaft hole assembly system is developed.This system enables virtual assembly operations,displays physical attributes,and provides valuable references for the research of virtual systems.展开更多
In order to promote the utilization level of new energy resources for local and efficient consumption,this paper introduces the biogas(BG)fermentation technology into the integrated energy system(IES).This initiative ...In order to promote the utilization level of new energy resources for local and efficient consumption,this paper introduces the biogas(BG)fermentation technology into the integrated energy system(IES).This initiative is to study the collaborative and optimal scheduling of IES with wind power(WP),photovoltaic(PV),and BG,while integrating carbon capture system(CCS)and power-to-gas(P2G)system.Firstly,the framework of collaborative operation of IES for BG-CCS-P2G is constructed.Secondly,the flexible scheduling resources of the source and load sides are fully exploited,and the collaborative operation mode of CCS-P2G is proposed to establish a model of IES with WP,PV,and BG multi-energy flow coupling.Then,with the objective of minimizing the intra-day operating cost and the constraints of system energy balance and equipment operating limits,the IES withWP,PV,and BG collaborative optimal scheduling model is established.Finally,taking into account the uncertainty of the output of WP and PV generation,the proposed optimal scheduling model is solved by CPLEX,and its validity is verified by setting several scenarios.The results show that the proposed collaborative operation mode and optimal scheduling model can realize the efficient,low-carbon,and economic operation of the IES with WP,PV,and BG and significantly enhance the utilization of new energy for local consumption.展开更多
The paper is an introduction to the front-end pulse acquisition and the back-end pulse biomimetic reproduction system.This system is capable of faithfully replicating the complete pulse waveform collected at the front...The paper is an introduction to the front-end pulse acquisition and the back-end pulse biomimetic reproduction system.This system is capable of faithfully replicating the complete pulse waveform collected at the front end.Traditional Chinese Medicine(TCM)practitioners analyze and diagnose the pulse patterns at the replication end.Meanwhile,the obtained pulse waveforms are analyzed and learnt by a neural network based on key diagnostic points in TCM pulse taking,which enables the determination of the corresponding relationships between different pulse waveforms and various pulse patterns in TCM pulse taking.With the support of clinical samples,an auxiliary diagnostic system for TCM pulse patterns ensures the accuracy of pulse pattern replication.展开更多
With the growing demand for offshore energy,deepwater drilling has become a vital technology in petroleum engineering.However,conventional drilling systems often face limitations such as delayed bottomhole pressure re...With the growing demand for offshore energy,deepwater drilling has become a vital technology in petroleum engineering.However,conventional drilling systems often face limitations such as delayed bottomhole pressure response and low control precision,particularly under narrow pressure window and complex formation conditions.To address these challenges,Dual-layer Pipe dual-gradient drilling(DGD)technology has been introduced,utilizing a dual-pipe structure and downhole lift pumps to extend the pressure control range.Despite these advantages,current DGD systems lack fast and precise bottomhole pressure control due to their reliance on indirect flow-based methods.This study proposes a bottomhole pressure control method based on backpressure regulation using a hybrid fuzzy-PID control strategy.A dynamic pressure calculation model is developed for the Dual-layer Pipe DGD system,incorporating coupling among choke valve opening,surface backpressure,and bottomhole pressure.The fuzzy-PID controller adjusts valve operation in real-time based on pressure deviation and its rate of change,improving response speed and control accuracy.Simulink-based simulations demonstrate that the proposed system achieves rapid pressure regulation with an overshoot below 5%and steady-state error under 0.12%.Compared to conventional PID control,the fuzzy-PID system shows superior adaptability to pressure variations.This research enhances the theoretical foundation of backpressure control in deepwater DGD operations and provides a practical approach for improving safety and efficiency in complex drilling environments.展开更多
This article started with an overview of the current technological status and engineering developments in the field of swarm munitions.It first introduced swarm behaviors and related swarm algorithms,and then provided...This article started with an overview of the current technological status and engineering developments in the field of swarm munitions.It first introduced swarm behaviors and related swarm algorithms,and then provided a comprehensive summary of the research progress in the field of swarm munitions from four aspects:Collaborative perception and detection,collaborative positioning and navigation,task allocation for swarms,and path planning for swarms.In summary,future developments in collaborative perception,planning,positioning,navigation,and decision-making for swarm munitions will trend towards intelligence,adaptability,and collaboration.It can enable swarm munitions to be better adapted to complex and dynamic battlefields,improving operational effectiveness and mission capabilities.展开更多
An Fe-doped bimetallic ZnFe-MOF precursor was prepared using a microchannel reactor,and carbonization was conducted to synthesize a bimetallic catalyst(ZnFe-NC).The fundamental reason for the efficient activity of the...An Fe-doped bimetallic ZnFe-MOF precursor was prepared using a microchannel reactor,and carbonization was conducted to synthesize a bimetallic catalyst(ZnFe-NC).The fundamental reason for the efficient activity of the catalyst was determined through an in-depth analysis of its structural composition and close correlation with the oxygen reduction reaction(ORR).The ZnFe-NC catalyst maintains a stable truncated rhombohedral morphology and a rich microporous structure,exhibiting excellent ORR activity and long-term stability.The experimental results show that compared with the reversible hydrogen electrode,it has a high half-wave potential of 0.902 V(E_(1/2)),retains 94%of activity after 35,000 s of stability testing,and exhibits significant methanol tolerance in alkaline media.Density functional theory calculations confirm the synergistic effect between the Zn and Fe sites.Furthermore,the results indicate that the interaction between ZnFe-N_(6)coordination structures reduces the reaction energy barrier,thus enhancing intermediate adsorption during the ORR.展开更多
基金supported by the Natural Science Foundation of Jiangsu Province(BK20231445)Aeronautical Science Foundation of China(20230028052001).
文摘The proton exchange membrane fuel cell(PEMFC)and the hydrogen hybrid power system are studied by the fuzzy-PID(FPID)controlmethod and the fuzzy-PID controlmethod by Artificial Bee Colony algorithm(ABCFPID),respectively.The results reveal that compared with the FPID control method,the temperature overshoot of the PEMFC stack under the ABC-FPID control method is decreased by 0.6%.Moreover,the circulating water flow rate within the full operating envelope(about 3 min)is reduced by 19.46 L,which means the ABC-FPID control method is more effective in regulating the stack temperature.Then,the ABC-FPID control method is proposed to study the hydrogen hybrid power system,and the system output power matching,operating characteristic curve of the fuel cell,state of charge(SOC)of the lithium battery,system efficiency and hydrogen demand are obtained.The results indicate that the maximum system efficiency reaches 46.3%,the average system efficiency is 33.8%,and the average hydrogen demand is 0.192 kg/s.Overall,the ABC-FPID control method can efficiently ensure the stability of the fuel cell’s output power,and actively prompt the lithium battery to fulfill the function of“peak shaving and valley filling”under variable load power conditions.
文摘The forming process and influencing factors of laser forming of TA15 titanium alloy sheet metal are researched.The effects of line energy and area energy on sheet metal bending were notable.The bending rate did not increase linearly with line energy rising.When the line energy increased to a certain value,the bending rate decreased gradually for material surface melting.The influence of sheet thickness on laser forming was also studied.Compared with 3mm sheet,1.5mm sheet was bended easily and more sensitive to the parameters.The metallurgical structure showed that the structure of heating area was divided into fusion zone,heat affected zone and intermediate zone.
基金China National Science and Technology Major Projects (2016ZX05050) “Large-scale low-permeability core formation oil and gas reservoir development demonstration project in Ordos Basin”.
文摘Shut-in after fracturing has become an important supporting technology for volume fracturing in unconventional oil and gas wells, which is helpful for gas and water imbibition replacement to increase single well production. In this paper, the hydraulic pressure, capillary pressure and osmotic pressure, the three main forces that affect well production, are calculated and compared in the Sulige tight sandstone gas field and Fuling shale gas field. The results show that the total forces affecting well production in the Sulige gas field are similar to those in the Fuling shale gas field, and it has the potential to exhibit shut-in after fracturing. For the characteristics of “low pressure” and “water blocking risk” in Sulige gas field, it is suggested that:(1)injecting N_(2) or CO_(2) during hydraulic fracturing and reasonably controlling the shut-in time after fracturing, such as shut-in for approximately 30 h, can ensure effective natural fluid flowback while replenishing energy to the formation and reduce the damage caused by water blocking and (2)the waterproof lock slickwater is used in the test wells, and the result shows that slickwater can reduce the reservoir damage and increase well production when compared with guanidine gum fracturing fluid. This research can provide some basis and reference for the field test of shut-in after fracturing in the Sulige tight sandstone gas field.
基金funded by National Key Research and Development Program of China(No.2022YFC3302103).
文摘The emergence of new media in various fields has continuously strengthened the social aspect of social media.Netizens tend to express emotions in social interactions,and many people even use satire,metaphors,and other techniques to express some negative emotions,it is necessary to detect sarcasm in social comment data.For sarcasm,the more reference data modalities used,the better the experimental effect.This paper conducts research on sarcasm detection technology based on image-text fusion data.To effectively utilize the features of each modality,a feature reconstruction output algorithm is proposed.This algorithm is based on the attention mechanism,learns the low-rank features of another modality through cross-modality,the eigenvectors are reconstructed for the corresponding modality through weighted averaging.When only the image modality in the dataset is used,the preprocessed data has outstanding performance in reconstructing the output model,with an accuracy rate of 87.6%.When using only the text modality data in the dataset,the reconstructed output model is optimal,with an accuracy rate of 85.2%.To improve feature fusion between modalities for effective classification,a weight adaptive learning algorithm is used.This algorithm uses a neural network combined with an attention mechanism to calculate the attention weight of each modality to achieve weight adaptive learning purposes,with an accuracy rate of 87.9%.Extensive experiments on a benchmark dataset demonstrate the superiority of our proposed model.
文摘Wu Chunsheng is a senior engineer of oil and gas field development,and the deputy director of the Oil Production Technology Research Institute of the No.10 Oil Production Plant of PetroChina Changqing Oilfield Company.He has devoted himself to working in the field of oilfield development technology since the very beginning of his career.During the period of"Building a Western Daqing Oilfield"and the"Second Round of Development Acceleration"in Changqing Oilfield,he worked hard and studied diligently,and took the initiative to take on responsibilities while focused on practical work,growing into an outstanding young technical cadre step by step.His achievements in the research,application,promotion of new techniques and technologies,and the application of scientific research results proved extraordinary.
文摘At present, the layering technology of water injection wells in Shengli Offshore Oilfield suffers from poor sealing, wear and tear of rubber parts, and corrosion and perforation of tubing, which seriously affect the normal production of oil wells. To this end, the efficient stratification technology of water injection wells is studied, which has the control of all hydraulic control systems in addition to the water distributor. Hydraulic control washable annular safety packer, one-time pressure, permanent locking;hydraulic control forcibly opens and closes the well washing channel to avoid polluting the marine ecological environment. The double-sealing structure design of the hydraulic-controlled repeating packer effectively expands the axial sealing area. The hydraulically controlled two-way well flushing valve realizes forward and reverse well flushing and improves well flushing efficiency. The connection between the hydraulic control system and the ground hydraulic control cabinet realizes the remote control of the underground hydraulic control tool by the office computer terminal system, reduces the labor intensity of post-maintenance, and solves the problem of operating safety for on-site personnel. By the end of 2020, the high-efficiency stratification technology of water injection wells had been applied in more than 140 wells in Chengdao Oilfield, and the longest validity period had reached 7.6 years. The overall practical life of the pipe string could effectively meet the 5-year efficient development requirements.
文摘Aiming at the problems that there are a lot of dead oil, wax and other pollutants in the casing wall, perforation hole and near-well zone of oil wells, which result in the limited flow capacity of oil wells and the decrease of production wells, the high-pressure jet compound plugging removal technology is studied. This technology has formed a composite plugging removal technique of vertical well and long well section segmented jet cleaning+chemical plugging removal, horizontal well segmented acidizing+foam mixed discharge cleaning and high pressure jet, which is suitable for Gaosheng Oilfields extremely thick and low permeability reservoir, and provides a strong technical guarantee for the efficient development of Gaosheng low permeability and extremely thick reservoir. It also provides a powerful technical reference for plugging removal of oil and water wells in other similar reservoirs, and has a good popularization and application prospect [1].
基金support from the National Natural Science Foundation of China(51604288)the Beijing Natural Science Foundation(IS23043)+1 种基金the Science Foundation of China University of Petroleum-Beijing(ZX20200133)the Research and Development Fund of China Huaneng Group Clean Energy Technology Research Institute(QNYJJ22-21).
文摘The substantial emissions of greenhouse gases,particularly CO_(2),constitute a primary driver of global warming.CCUS is proposed as an effective mitigation strategy which is often estimated to account for about 15%of cumulative carbon emission reduction.In-situ CO_(2) mineralization sequestration,compared to conventional geological storage methods such as depleted oil and gas reservoirs,unmineable coal seams,and deep saline aquifers,offers the advantage of permanent immobilization of injected carbon.However,uncertainties persist regarding the characteristics of geochemical interactions under reservoir pore conditions,as well as the kinetic mechanisms of mineralization reactions.Additionally,geochemical reactions may lead to solid particle transport and deposition,potentially causing pore throat occlusion.Pilot projects in Iceland and the United States have demonstrated the feasibility of this technology,but the field remains in the early deployment stage.In this review,the mechanisms of in-situ mineralization have been elucidated,the primary factors influencing the reaction kinetics have been discussed,and the current research status in this field has been summarized.It is emphasized that establishing a reliable system for evaluating storage capacity and understanding the kinetic mechanisms governing CO_(2) conversion into minerals at multi-phase interfaces are key priorities for future work.
基金Project supported by the National Key Basic Research and Development Program(973 Program)“Theory and Technology Adaptability of Shale Gas Development in Typical Marine Blocks in South China”(No.2013CB228006).
文摘Horizontal shale gas well fracturing is mostly carried out by pumping bridge plugs.In the case of casing deformation,the bridge plug can not be pumped down to the designated position,so the hole sections below the deformation could not be stimulated according to the design program.About 30%of horizontal shale gas wells in the Changning and Weiyuan Blocks,Sichuan Basin,suffer various casing deformation after fracturing.Previously,the hole sections which could not be stimulated due to casing deformation were generally abandoned.As a result,the resources controlled by shale gas wells weren't exploited effectively and the fracturing effect was impacted greatly.There are a lot of difficulties in investigating casing deformation,such as complex mechanisms,various influencing factors and unpredictable deformation time.Therefore,it is especially important to seek a staged fracturing technology suitable for the casing deformation sections.In this paper,the staged fracturing technology with sand plugs inside fractures and the staged fracturing technology with temporary plugging balls were tested in casing deformation wells.The staged fracturing technology with sand plugs inside fractures was carried out in the mode of single-stage perforation and single-stage fracturing.The staged fracturing technology with temporary plugging balls was conducted in the mode of single perforation,continuous fracturing and staged ball dropping.Then,two kinds of technologies were compared in terms of their advantages and disadvantages.Finally,they were tested on site.According to the pressure response,the pressure monitoring of the adjacent wells and the microseismic monitoring in the process of actual fracturing,both technologies are effective in the stimulation of the casing deformation sections,realizing well control reserves efficiently and guaranteeing fracturing effects.
基金supported jointly by the National Natural Science Foundation of China(No.51574197)Educational Commission of Sichuan Province of China(No.16ZA0071).
文摘In recent years,shale oil and gas development has been thriving in China.However,the shale oil and gas production always suffers a rapid decline.Based on the analysis of a large amount of former theories and experiences,a summary of acid treatment stimulation methods in shale oil and gas is presented,and the acid stimulation mechanism is analyzed.The mainstream technique in acid treatments includes:acid wash,matrix acidizing,prop fracturing with acid preflush,and multi-stage alternate-inject acid fracturing.The main stimulation mechanism of acid treatment can be summarized into 3 categories:a)the influence on shale matrix,namely the acid-induced increase of porosity and permeability,and reduce of wetting property of shale;b)the influence on rock mechanical properties,namely shale brittleness and toughness,and even Young Modulus to some degree;c)the influence on fractures'conductivity,caused by the fact that acid dissolves calcite-enrichment area in priority,and then increases roughness on fracture surface.In room temperature and atmospheric pressure,acid reduces fractures'conductivity,while in pressurized condition,the acid-soaked fractures'conductivity is higher than the conductivity of non-acid-soaked fractures.These knowledges would provide useful reference for furthering stimulation techniques and processes in shale oil and gas development.
文摘The treatment of soil pollution is very difficult, and it is faced with such difficult problems as high cost, long period and great difficulty. In this paper, the causes and types of soil pollution and the remediation technologies of contaminated soil are introduced. Based on different principles, the research and application status and progress of biological, chemical and physical remediation technologies are reviewed, and the research and application of numerical simulation in soil remediation are introduced. Looking forward to the development of soil remediation technology, on the one hand, it is necessary to build a soil environmental management system, on the other hand, it is necessary to increase the research on the technical mechanism and numerical simulation to promote the high-level development of the industry.
基金supported by Fundamental Research Program of Shanxi Province(202203021221303)。
文摘Transformation of urea and glycerol to glycerol carbonate is an environmental friendly and economical process.Catalysts play an indispensable role in the process.Although many catalysts have been developed,the performance of the catalysts still cannot meet the needs of industrialization.In this paper,research progress of the homogeneous and heterogeneous catalysts of the reaction over the past 20 years were reviewed systematically.According to the types and active centers of catalysts,the catalysts were classified systematically and analyzed in detail.The typical reaction mechanisms were also summarized.The research and development direction of catalysts is made more explicit through systematic classification and mechanism analysis.The article reveals more novel catalysts have been designed and used for the reaction,such as mixed metal oxides with special structures,solid wastes and non-metallic materials.This work summarized the current state of research and prospected possible routes for design of novel catalysts.It is hoped that this review can provide some references for developing efficient catalysts.
基金supported by the specialized fund project for the fundamental research operation of central-level public welfare scientific research institutes,titled“Research on the International Standards System Construction and Updates in the Field of Fire Protection(Project No.2023SJ09)”.
文摘This paper discusses the importance of standards in the fire extinguishing agent industry,and highlights the vital role of the standards in promoting technological innovation.China’s standards for fire extinguishing agent products have evolved significantly,aligning with industrial development,market demands,regulatory requirements,to respond to the great impact of international competition in the industry.The paper analyzes the current state of China’s standards,including their composition and integration with industry growth,green development strategies,and international harmonization.Future development strategies for the standards framework should focus on valid period estimation,fire test model development,and raw material selection guidelines.By implementing these strategies,China’s fire protection industry can enhance product quality,contribute to public safety,and maintain a competitive edge in the global market.
基金Sponsored by the National Natural Science Foundation of China(Grant No.52005003)the Science and Technology Planning Project of Wuhu City(Grant No.2022jc41)。
文摘To address the challenges of insufficient visualization in the industrial robot assembly operation system and the limitation of visualizing only geometric attributes of physical properties,a method is proposed for constructing an industrial robot assembly system based on virtual reality technology.Focusing on the shaft hole assembly,the mechanical characteristics of the industrial robot shaft hole assembly process are analyzed and a dynamic model is established for shaft hole assembly operations.The key elements of virtual assembly operations for industrial robots are summarized and a five-dimensional model is proposed for industrial robot virtual operations.Utilizing the Unity3D engine based on the 5-D model for industrial robot virtual operations,an industrial robot shaft hole assembly system is developed.This system enables virtual assembly operations,displays physical attributes,and provides valuable references for the research of virtual systems.
文摘In order to promote the utilization level of new energy resources for local and efficient consumption,this paper introduces the biogas(BG)fermentation technology into the integrated energy system(IES).This initiative is to study the collaborative and optimal scheduling of IES with wind power(WP),photovoltaic(PV),and BG,while integrating carbon capture system(CCS)and power-to-gas(P2G)system.Firstly,the framework of collaborative operation of IES for BG-CCS-P2G is constructed.Secondly,the flexible scheduling resources of the source and load sides are fully exploited,and the collaborative operation mode of CCS-P2G is proposed to establish a model of IES with WP,PV,and BG multi-energy flow coupling.Then,with the objective of minimizing the intra-day operating cost and the constraints of system energy balance and equipment operating limits,the IES withWP,PV,and BG collaborative optimal scheduling model is established.Finally,taking into account the uncertainty of the output of WP and PV generation,the proposed optimal scheduling model is solved by CPLEX,and its validity is verified by setting several scenarios.The results show that the proposed collaborative operation mode and optimal scheduling model can realize the efficient,low-carbon,and economic operation of the IES with WP,PV,and BG and significantly enhance the utilization of new energy for local consumption.
基金Key R&D Plan of Liaoning Province(No.202000357-JH13/103):Construction of Liaoning Traditional Chinese Medicine Industry Technology Innovation Research InstituteNational Key Research and Development Plan Special Project(No.2019JH2/10300040)。
文摘The paper is an introduction to the front-end pulse acquisition and the back-end pulse biomimetic reproduction system.This system is capable of faithfully replicating the complete pulse waveform collected at the front end.Traditional Chinese Medicine(TCM)practitioners analyze and diagnose the pulse patterns at the replication end.Meanwhile,the obtained pulse waveforms are analyzed and learnt by a neural network based on key diagnostic points in TCM pulse taking,which enables the determination of the corresponding relationships between different pulse waveforms and various pulse patterns in TCM pulse taking.With the support of clinical samples,an auxiliary diagnostic system for TCM pulse patterns ensures the accuracy of pulse pattern replication.
基金the Sichuan Provincial Key R&D Program(Regional Innovation Coop-eration Project 2025YFHZ0306)Open Fund(PLN 2022-46)of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Southwest Petroleum University)Special Support for Sichuan Postdoctoral Research Projects.
文摘With the growing demand for offshore energy,deepwater drilling has become a vital technology in petroleum engineering.However,conventional drilling systems often face limitations such as delayed bottomhole pressure response and low control precision,particularly under narrow pressure window and complex formation conditions.To address these challenges,Dual-layer Pipe dual-gradient drilling(DGD)technology has been introduced,utilizing a dual-pipe structure and downhole lift pumps to extend the pressure control range.Despite these advantages,current DGD systems lack fast and precise bottomhole pressure control due to their reliance on indirect flow-based methods.This study proposes a bottomhole pressure control method based on backpressure regulation using a hybrid fuzzy-PID control strategy.A dynamic pressure calculation model is developed for the Dual-layer Pipe DGD system,incorporating coupling among choke valve opening,surface backpressure,and bottomhole pressure.The fuzzy-PID controller adjusts valve operation in real-time based on pressure deviation and its rate of change,improving response speed and control accuracy.Simulink-based simulations demonstrate that the proposed system achieves rapid pressure regulation with an overshoot below 5%and steady-state error under 0.12%.Compared to conventional PID control,the fuzzy-PID system shows superior adaptability to pressure variations.This research enhances the theoretical foundation of backpressure control in deepwater DGD operations and provides a practical approach for improving safety and efficiency in complex drilling environments.
文摘This article started with an overview of the current technological status and engineering developments in the field of swarm munitions.It first introduced swarm behaviors and related swarm algorithms,and then provided a comprehensive summary of the research progress in the field of swarm munitions from four aspects:Collaborative perception and detection,collaborative positioning and navigation,task allocation for swarms,and path planning for swarms.In summary,future developments in collaborative perception,planning,positioning,navigation,and decision-making for swarm munitions will trend towards intelligence,adaptability,and collaboration.It can enable swarm munitions to be better adapted to complex and dynamic battlefields,improving operational effectiveness and mission capabilities.
基金financially supported by Xinjiang Science and Technology Program(No.2023TSYCCX0118)Bingtuan Science and Technology Program(No.2023AB033)。
文摘An Fe-doped bimetallic ZnFe-MOF precursor was prepared using a microchannel reactor,and carbonization was conducted to synthesize a bimetallic catalyst(ZnFe-NC).The fundamental reason for the efficient activity of the catalyst was determined through an in-depth analysis of its structural composition and close correlation with the oxygen reduction reaction(ORR).The ZnFe-NC catalyst maintains a stable truncated rhombohedral morphology and a rich microporous structure,exhibiting excellent ORR activity and long-term stability.The experimental results show that compared with the reversible hydrogen electrode,it has a high half-wave potential of 0.902 V(E_(1/2)),retains 94%of activity after 35,000 s of stability testing,and exhibits significant methanol tolerance in alkaline media.Density functional theory calculations confirm the synergistic effect between the Zn and Fe sites.Furthermore,the results indicate that the interaction between ZnFe-N_(6)coordination structures reduces the reaction energy barrier,thus enhancing intermediate adsorption during the ORR.
