The exploration and development of oil and gas resources in the Sichuan Basin is shifting to the deeper strata.The deep and ultra-deep wells in deep carbonate gas reservoirs are faced with many difficulties,such as mu...The exploration and development of oil and gas resources in the Sichuan Basin is shifting to the deeper strata.The deep and ultra-deep wells in deep carbonate gas reservoirs are faced with many difficulties,such as multiple pressure systems,poor drillability,ultra-high pressure,ultra-high temperature and high sulfur content,which bring great challenges to drilling and completion engineering.In order to ensure the smooth exploration and development of deep carbonate oil and gas resources in the Sichuan Basin,the overall concept of combiningfield practice and technological research is followed.During the 13th Five-Year Plan,a batch of ultra-deep wells(well depth about 8000 m)have been drilled fast and safely(such as Well SYX133 in the Shuangyushi structure),and great progresses have been achieved in the experimental research of the support technologies in drilling and completion of deep and ultra-deep wells.And the achievements are as follows.First,the optimization of non-standard well structure,combined with the application of precisely managed pressure drilling technology and under-pressure plugging technology,lays a foundation for the optimized fast drilling and the safe reaching of geological targets.Second,a high-efficiency customized PDC drill bit is comprehensively optimized,popularized and applied,which effectively improves the average rate of penetration(ROP)in difficult-to-drill formations.Third,the development and application of drillingfluids(e.g.being resistant to high temperature of 200 C and anti-composite brine)and active under-pressure plugging technology effectively reduces downhole complexities while drilling the complex for-mations,such as high temperature and high pressure brine and circulation loss.Fourth,when precisely managed pressure drilling and precisely managed pressure cementing methods are applied in the strata with a narrow density window,multiple pressure systems and pressure sensitivity,the average drilling and completionfluid loss is reduced by more than 90%,and the complexity treatment time is cut down by more than 85%,and the cementing quality pass rate is increased by more than 20%.Fifth,the integrated application of ROP improvement technologies and tools(e.g.air drilling)results in a great reduction of drilling cycle and cost.It is concluded that the experimental research achievements provide basic support for the fast development of natural gas resources in the Anyue Gas Field,Sichuan Basin,and the great discovery of the Permian and Devonian natural gas resources in the northwestern Sichuan Basin.What's more,in order to adapt to the development of the deep natural gas(over 9000 m)in the Sichuan Basin during the 14th Five-Year Plan,it is necessary to speed up researches on drilling and completion tech-nologies in nine aspects,e.g.high-temperature downhole tools and workingfluid.展开更多
Ultra-deep formations hold abundant oil and gas resources.As the demand for oil and gas increases with economic development,more and more efforts are putting into the exploration and development of oil and gas reservo...Ultra-deep formations hold abundant oil and gas resources.As the demand for oil and gas increases with economic development,more and more efforts are putting into the exploration and development of oil and gas reservoirs in deep formations around the world.In China,the exploration and development of deep oil and gas are pacing up,especially in ultra-deep formations in the Sichuan Basin,Tarim Basin and Ordos Basin.The reservoirs in these basins feature extremely large depth(over 7000 m),super high temperature(150°C-210°C),super high pressure(over 150 MPa),high acid gas content(H_2S and CO_2),strong heterogeneity,and multiple pressure systems,which pose a series of challenges to wellbore engineering technologies including drilling,drilling fluid,cementing,logging,and completion testing.Therefore,it is necessary to delve into core drilling and testing technologies for deep formations.展开更多
Natural gas from ultra-deep reservoirs has been a major contributor for reserves boost,deliverability construction,and profits growth in natural gas industry in China.As a significant strategic domain in the future de...Natural gas from ultra-deep reservoirs has been a major contributor for reserves boost,deliverability construction,and profits growth in natural gas industry in China.As a significant strategic domain in the future development of upstream business,the high-quality development of ultra-deep gas resources has great significance for economic benefits enhancement and sustained regional supply assurance.In this paper,based on the appraisal of development characteristics and effectiveness in the developed large ultra-deep gasfields,challenges for high quality development were indicated,which include the difficulties in structure confirm,uncertainties in reserves define and production optimization,risks of aquifer water early breakthrough and high investment of deep wells.Through indoor physical simulation experiments,reservoir characterization,performance evaluation,reservoir simulation and knowledge acquisition from analogousfields at home and abroad,the connotation and requirements for high quality development were discussed,and furthermore,strategies and proposals were thus proposed as follows:to strengthen the pre-development reservoir evaluation to define movable gas reserves and quantify rational production rate so as to avoid facility waste;to optimize both well pattern and wellflow rate to achieve uniform depletion and high EUR;to continuously enhance drilling&completion technologies to further reduce drilling and completion circle and cost and targeted reservoir stimulation technologies to enhance movable reserves and single-well productivity and increase the depletion of inferior reserves;and to innovate management modes to establish scientific programs and procedures for the construction,production and operation of ultra-deep gasfields and strictly control the upper limit index of production rate so as to emphasize quality benefits.In conclusion,high-quality development of ultra-deep gasfields,a hard and complex system though,will be possibly achieved only by continuous innovation of exploration and development technologies and management modes.展开更多
On August 2,a twin-segment solid rocket motor of the largest diameter,grain mass and thrust in China completed its ground test firing with success.The3 m solid motor was independently developed by the Academy of Aeros...On August 2,a twin-segment solid rocket motor of the largest diameter,grain mass and thrust in China completed its ground test firing with success.The3 m solid motor was independently developed by the Academy of Aerospace Solid Propulsion Technology（AASPT）under CASC.展开更多
A new method,named the complete liquid-phase technology,has been applied to prepare catalysts for methanol synthesis.Its main innovative thought lies in preparing slurry catalysts directly from raw solution.Activity t...A new method,named the complete liquid-phase technology,has been applied to prepare catalysts for methanol synthesis.Its main innovative thought lies in preparing slurry catalysts directly from raw solution.Activity tests indicate that the CuZnAl slurry catalyst prepared by the new method can efficiently catalyze conversion of syngas to ethanol in a slurry reactor,while CO conversion reaches 35.9%and ethanol selectivity is more than 20%,with a total alcohol selectivity of more than 87%.No deactivation was found during the 192 h reaction.展开更多
A state-owned enterprise grasps new opportunities In a huge dome immersed in blue laser lights,people experience a breathtaking race along glowing glass rails,accompanied by adrenaline-pumping music with3Dgraphics fas...A state-owned enterprise grasps new opportunities In a huge dome immersed in blue laser lights,people experience a breathtaking race along glowing glass rails,accompanied by adrenaline-pumping music with3Dgraphics fashingpasttheireyes.展开更多
基金supported by the National Research Council of Science and Technology Major Project“Sichuan Basin Large-scale Carbonate Cas Fiekd Development Demonstration Project”(No.:2016ZX05052).
文摘The exploration and development of oil and gas resources in the Sichuan Basin is shifting to the deeper strata.The deep and ultra-deep wells in deep carbonate gas reservoirs are faced with many difficulties,such as multiple pressure systems,poor drillability,ultra-high pressure,ultra-high temperature and high sulfur content,which bring great challenges to drilling and completion engineering.In order to ensure the smooth exploration and development of deep carbonate oil and gas resources in the Sichuan Basin,the overall concept of combiningfield practice and technological research is followed.During the 13th Five-Year Plan,a batch of ultra-deep wells(well depth about 8000 m)have been drilled fast and safely(such as Well SYX133 in the Shuangyushi structure),and great progresses have been achieved in the experimental research of the support technologies in drilling and completion of deep and ultra-deep wells.And the achievements are as follows.First,the optimization of non-standard well structure,combined with the application of precisely managed pressure drilling technology and under-pressure plugging technology,lays a foundation for the optimized fast drilling and the safe reaching of geological targets.Second,a high-efficiency customized PDC drill bit is comprehensively optimized,popularized and applied,which effectively improves the average rate of penetration(ROP)in difficult-to-drill formations.Third,the development and application of drillingfluids(e.g.being resistant to high temperature of 200 C and anti-composite brine)and active under-pressure plugging technology effectively reduces downhole complexities while drilling the complex for-mations,such as high temperature and high pressure brine and circulation loss.Fourth,when precisely managed pressure drilling and precisely managed pressure cementing methods are applied in the strata with a narrow density window,multiple pressure systems and pressure sensitivity,the average drilling and completionfluid loss is reduced by more than 90%,and the complexity treatment time is cut down by more than 85%,and the cementing quality pass rate is increased by more than 20%.Fifth,the integrated application of ROP improvement technologies and tools(e.g.air drilling)results in a great reduction of drilling cycle and cost.It is concluded that the experimental research achievements provide basic support for the fast development of natural gas resources in the Anyue Gas Field,Sichuan Basin,and the great discovery of the Permian and Devonian natural gas resources in the northwestern Sichuan Basin.What's more,in order to adapt to the development of the deep natural gas(over 9000 m)in the Sichuan Basin during the 14th Five-Year Plan,it is necessary to speed up researches on drilling and completion tech-nologies in nine aspects,e.g.high-temperature downhole tools and workingfluid.
文摘Ultra-deep formations hold abundant oil and gas resources.As the demand for oil and gas increases with economic development,more and more efforts are putting into the exploration and development of oil and gas reservoirs in deep formations around the world.In China,the exploration and development of deep oil and gas are pacing up,especially in ultra-deep formations in the Sichuan Basin,Tarim Basin and Ordos Basin.The reservoirs in these basins feature extremely large depth(over 7000 m),super high temperature(150°C-210°C),super high pressure(over 150 MPa),high acid gas content(H_2S and CO_2),strong heterogeneity,and multiple pressure systems,which pose a series of challenges to wellbore engineering technologies including drilling,drilling fluid,cementing,logging,and completion testing.Therefore,it is necessary to delve into core drilling and testing technologies for deep formations.
文摘Natural gas from ultra-deep reservoirs has been a major contributor for reserves boost,deliverability construction,and profits growth in natural gas industry in China.As a significant strategic domain in the future development of upstream business,the high-quality development of ultra-deep gas resources has great significance for economic benefits enhancement and sustained regional supply assurance.In this paper,based on the appraisal of development characteristics and effectiveness in the developed large ultra-deep gasfields,challenges for high quality development were indicated,which include the difficulties in structure confirm,uncertainties in reserves define and production optimization,risks of aquifer water early breakthrough and high investment of deep wells.Through indoor physical simulation experiments,reservoir characterization,performance evaluation,reservoir simulation and knowledge acquisition from analogousfields at home and abroad,the connotation and requirements for high quality development were discussed,and furthermore,strategies and proposals were thus proposed as follows:to strengthen the pre-development reservoir evaluation to define movable gas reserves and quantify rational production rate so as to avoid facility waste;to optimize both well pattern and wellflow rate to achieve uniform depletion and high EUR;to continuously enhance drilling&completion technologies to further reduce drilling and completion circle and cost and targeted reservoir stimulation technologies to enhance movable reserves and single-well productivity and increase the depletion of inferior reserves;and to innovate management modes to establish scientific programs and procedures for the construction,production and operation of ultra-deep gasfields and strictly control the upper limit index of production rate so as to emphasize quality benefits.In conclusion,high-quality development of ultra-deep gasfields,a hard and complex system though,will be possibly achieved only by continuous innovation of exploration and development technologies and management modes.
文摘On August 2,a twin-segment solid rocket motor of the largest diameter,grain mass and thrust in China completed its ground test firing with success.The3 m solid motor was independently developed by the Academy of Aerospace Solid Propulsion Technology（AASPT）under CASC.
文摘A new method,named the complete liquid-phase technology,has been applied to prepare catalysts for methanol synthesis.Its main innovative thought lies in preparing slurry catalysts directly from raw solution.Activity tests indicate that the CuZnAl slurry catalyst prepared by the new method can efficiently catalyze conversion of syngas to ethanol in a slurry reactor,while CO conversion reaches 35.9%and ethanol selectivity is more than 20%,with a total alcohol selectivity of more than 87%.No deactivation was found during the 192 h reaction.
文摘A state-owned enterprise grasps new opportunities In a huge dome immersed in blue laser lights,people experience a breathtaking race along glowing glass rails,accompanied by adrenaline-pumping music with3Dgraphics fashingpasttheireyes.
