With the development of heavy oil reservoir in Le 'an, Shengli Oilfield, there are some problems, such as the increase of steam injection pressure, the deterioration of conventional steam injection effect and the ...With the development of heavy oil reservoir in Le 'an, Shengli Oilfield, there are some problems, such as the increase of steam injection pressure, the deterioration of conventional steam injection effect and the difficulty of subsequent production. In order to improve the development effect of heavy oil reservoir, it is necessary to optimize the design of measures, ensure and control the quality of steam injection, and fine process management according to the development characteristics of heavy oil reservoir, so as to achieve the best effect. Implement node-based fine management of heavy oil thermal recovery, innovate and enrich the types of heavy oil thermal recovery measures in terms of source design, and improve the efficiency of measures;In terms of production and operation, shorten the time of steam injection, improve the operating time rate of steam injection and ensure the dryness of steam entering the well;In terms of oil well production, fine management by cycle and type is implemented to give full play to the maximum productivity of oil wells. Take multiple measures to ensure efficient development of lean heavy oil reservoir.展开更多
The Yan'an Gas Field is located in the southeastern part of the Ordos Basin,and its low-permeability tight sandstone gas reservoirs are characterized by thin reservoirs,poor physical properties and complex overlap...The Yan'an Gas Field is located in the southeastern part of the Ordos Basin,and its low-permeability tight sandstone gas reservoirs are characterized by thin reservoirs,poor physical properties and complex overlapping relationships.In addition,its surface is loess tableland,which makes it difficult to predict reservoirs by using seismic data.As a result,existing engineering technologies for gas field development cannot support the efficient development of this field.In order to optimize the development methods and technologies of the Yan'an Gas Field,the Yanchang Petroleum(Group)Co.Ltd.has developed to a set of key technologies suitable for the benefit development of this field concerning reservoir prediction,well pattern optimization,drilling and completion,reservoir protection,fracturing stimulation and ground gathering and transportation after nearly ten years of theoretical and technical researches.First,an effective reservoir prediction technology based on dynamic knowledge base was developed.It improves the drilling ratio of effective sandbody dramatically and achieves the accurate tracking of stable single sandbody in the range of 3-5 m.Second,a three-dimensional exploitation mode of hybrid well pattern based on the irregular diamond-shaped well pattern was established.It includes the multi-layer commingled production of cluster well and the single-layer production of horizontal well.Compared with regular well patterns,the well number is reduced by 6.9%and well pattern control is increased by 8%.Third,high-efficiency drilling technology for vulnerable reservoirs with collapse and leakage in the same well was developed.It improves wellbore wall stability,shortens drilling cycle and protects reservoir.Fourth,the multi-layer long-span fracturing of vertical/directional wells in one operation and the CO_(2)and hydraulic fracturing treatment of horizontal wells were realized to improve single well production significantly.Fifth,the medium-pressure gathering and transportation system in loess tableland with downhole throttling,branch-on-branch inter-well tandem and centralized alcohol injection as the core technologies was established.It reduces workload,shortens construction cycle and improves economic benefit.In conclusion,these development technologies play a crucial role in the development,appraisal and productivity construction of the Yan'an Gas Field.Through the application of these key technologies,the benefit development of this field is realized with an annual natural gas production capacity of 50×10^(8)m^(3).Furthermore,they are conducive to the enrichment and development of the theories and technologies for developing tight sandstone gas reservoirs in China,and they can be used as a reference for the development of similar gas fields.展开更多
Low average single-well production resulting in low economic benefit has become the main bottleneck of the CBM gas development in China.So it is significant to choose suitable efficient development technologies based ...Low average single-well production resulting in low economic benefit has become the main bottleneck of the CBM gas development in China.So it is significant to choose suitable efficient development technologies based on CBM geological factors for high rank CBM recovery enhancement.In view of this,CBM geological factors were analyzed,different geological models were established and the corresponding models of development engineering technologies were thus put forward.It was proposed that the four main factors affecting high rank CBM recovery from a lower degree to a higher degree respectively include coal texture,rank of coal metamorphism,in-situ stress,and the ratio of critical desorption pressure to initial reservoir pressure.On this basis,four engineering geological models were classified as follows:vertical well,open-hole multilateral horizontal well,U-shaped and roof tree-like horizontal wells,and fish-bone and L-shaped wells.It is concluded that the former two models are more adaptable in such areas with better coal texture and high degree of thermal maturity,while the latter two are commonly applied in a wide range of areas.展开更多
文摘With the development of heavy oil reservoir in Le 'an, Shengli Oilfield, there are some problems, such as the increase of steam injection pressure, the deterioration of conventional steam injection effect and the difficulty of subsequent production. In order to improve the development effect of heavy oil reservoir, it is necessary to optimize the design of measures, ensure and control the quality of steam injection, and fine process management according to the development characteristics of heavy oil reservoir, so as to achieve the best effect. Implement node-based fine management of heavy oil thermal recovery, innovate and enrich the types of heavy oil thermal recovery measures in terms of source design, and improve the efficiency of measures;In terms of production and operation, shorten the time of steam injection, improve the operating time rate of steam injection and ensure the dryness of steam entering the well;In terms of oil well production, fine management by cycle and type is implemented to give full play to the maximum productivity of oil wells. Take multiple measures to ensure efficient development of lean heavy oil reservoir.
基金Project supported by the National High-tech Research and Development Plan(863 Program)project“new technology for shale gas exploration and development”(No.:2013AA064501)Shaanxi Science and Technology Research and Development Plan project“Natural gas exploration and development innovation team of Shaanxi Yanchang Petroleum”(No.:2015KCT-17).
文摘The Yan'an Gas Field is located in the southeastern part of the Ordos Basin,and its low-permeability tight sandstone gas reservoirs are characterized by thin reservoirs,poor physical properties and complex overlapping relationships.In addition,its surface is loess tableland,which makes it difficult to predict reservoirs by using seismic data.As a result,existing engineering technologies for gas field development cannot support the efficient development of this field.In order to optimize the development methods and technologies of the Yan'an Gas Field,the Yanchang Petroleum(Group)Co.Ltd.has developed to a set of key technologies suitable for the benefit development of this field concerning reservoir prediction,well pattern optimization,drilling and completion,reservoir protection,fracturing stimulation and ground gathering and transportation after nearly ten years of theoretical and technical researches.First,an effective reservoir prediction technology based on dynamic knowledge base was developed.It improves the drilling ratio of effective sandbody dramatically and achieves the accurate tracking of stable single sandbody in the range of 3-5 m.Second,a three-dimensional exploitation mode of hybrid well pattern based on the irregular diamond-shaped well pattern was established.It includes the multi-layer commingled production of cluster well and the single-layer production of horizontal well.Compared with regular well patterns,the well number is reduced by 6.9%and well pattern control is increased by 8%.Third,high-efficiency drilling technology for vulnerable reservoirs with collapse and leakage in the same well was developed.It improves wellbore wall stability,shortens drilling cycle and protects reservoir.Fourth,the multi-layer long-span fracturing of vertical/directional wells in one operation and the CO_(2)and hydraulic fracturing treatment of horizontal wells were realized to improve single well production significantly.Fifth,the medium-pressure gathering and transportation system in loess tableland with downhole throttling,branch-on-branch inter-well tandem and centralized alcohol injection as the core technologies was established.It reduces workload,shortens construction cycle and improves economic benefit.In conclusion,these development technologies play a crucial role in the development,appraisal and productivity construction of the Yan'an Gas Field.Through the application of these key technologies,the benefit development of this field is realized with an annual natural gas production capacity of 50×10^(8)m^(3).Furthermore,they are conducive to the enrichment and development of the theories and technologies for developing tight sandstone gas reservoirs in China,and they can be used as a reference for the development of similar gas fields.
基金Project supported by the National Major Science and Technology Project“Demonstrative horizontal well development of CBM in Qinshui Basin,Shanxi”(No.:2011ZX05061)PetroChina Major Science and Technology Project“Demonstrative exploration and development of CBM in Qinshui Basin”(No.:2010E-2208)PetroChina Huabei Oilfield Science and Technology Project“Research on efficient development technologies for Mabe East block”(No.:2016-HB-M06).
文摘Low average single-well production resulting in low economic benefit has become the main bottleneck of the CBM gas development in China.So it is significant to choose suitable efficient development technologies based on CBM geological factors for high rank CBM recovery enhancement.In view of this,CBM geological factors were analyzed,different geological models were established and the corresponding models of development engineering technologies were thus put forward.It was proposed that the four main factors affecting high rank CBM recovery from a lower degree to a higher degree respectively include coal texture,rank of coal metamorphism,in-situ stress,and the ratio of critical desorption pressure to initial reservoir pressure.On this basis,four engineering geological models were classified as follows:vertical well,open-hole multilateral horizontal well,U-shaped and roof tree-like horizontal wells,and fish-bone and L-shaped wells.It is concluded that the former two models are more adaptable in such areas with better coal texture and high degree of thermal maturity,while the latter two are commonly applied in a wide range of areas.
