To address the persistent challenge of dynamic mismatch between wellbore lifting capacity and reservoir fluid supply,and to establish a robust optimization framework for drainage operations in high-water-cut tight san...To address the persistent challenge of dynamic mismatch between wellbore lifting capacity and reservoir fluid supply,and to establish a robust optimization framework for drainage operations in high-water-cut tight sandstone gas reservoirs,this study systematically investigates the graded optimization and dynamic adaptation of drainage gas recovery technologies.Production data from a representative tight gas field were first employed to forecast reservoir performance.The predictive reliability was rigorously validated through high-precision history matching,thereby providing a quantitatively consistent foundation for subsequent wellbore optimization.Building on this characterization,a coupled simulation framework was developed that integrates wellbore multiphase flow modeling with nodal analysis based on the Inflow Performance Relationship,IPR,and the Vertical Lift Performance,VLP.This coordinated approach enables comprehensive evaluation of process adaptability and dynamic optimization of foam-assisted drainage,mechanical pumping,and jet pumping systems under evolving water-gas ratio,WGR conditions.The results reveal that a progressively increasing water-gas ratio is the dominant factor driving the transition from chemically assisted drainage methods to mechanically enhanced lifting technologies.A distinct quantitative threshold is identified at WGR≈0.002,beyond which mechanical intervention becomes more effective and economically justified.For mechanical pumping and jet pumping systems,a parameter inversion optimization strategy constrained by the target bottomhole flowing pressure,Pwf,is proposed to ensure stable production while maintaining reservoir drawdown control.In particular,the nozzle-to-throat area ratio of the jet pump is identified as the key governing parameter influencing entrainment capacity and lifting efficiency.Moreover,a configuration characterized by small pump diameter,long stroke length,and low operating speed is demonstrated to satisfy drainage requirements while mitigating torque fluctuations,enhancing volumetric efficiency,and improving pump fillage stability.展开更多
China’s enhanced intellectual property rights(IPR)protection framework presents a promising prospect for European SMEs to pursue strategic growth and market expansion within the country’s innovation-driven economy.
This study investigates the unsteady flow characteristics of shale oil reservoirs during the depletion development process,with a particular focus on production behavior following fracturing and shut-in stages.Shale r...This study investigates the unsteady flow characteristics of shale oil reservoirs during the depletion development process,with a particular focus on production behavior following fracturing and shut-in stages.Shale reservoirs exhibit distinctive production patterns that differ from traditional oil reservoirs,as their inflow performance does not conform to the classic steady-state relationship.Instead,production is governed by unsteady-state flow behavior,and the combined effects of thewellbore and choke cause the inflowperformance curve to evolve dynamically over time.To address these challenges,this study introduces the concept of a“Dynamic IPR curve”and develops a dynamic production analysis method that integrates production time,continuity across multi-stage state fields,and the interactions between tubing flow and choke flow.This method provides a robust framework to characterize the attenuation trend of reservoir productivity and to accurately describe wellbore flow behavior.By applying the dynamic IPR approach,the study overcomes the limitations of conventional methods,which are unable to capture the temporal variations inherent in shale reservoir production.The proposed methodology offers a theoretical foundation for improved production forecasting,optimization of choke size,and analysis of wellbore tubing characteristics,thereby supporting more effective operational decision-making across different stages of shale reservoir development.展开更多
基金supported by the Major Science and Technology Project of PetroChina Company Limited“Research on Key Technologies for Enhancing Recovery in Tight Sandstone Gas Reservoirs”,specifically under its third sub-project:“Research on Integrated Fracturing,Drainage,and Production Technology to Enhance Single-Well Production in Water-Bearing Gas Reservoirs”(Grant number:2023ZZ25YJ03).
文摘To address the persistent challenge of dynamic mismatch between wellbore lifting capacity and reservoir fluid supply,and to establish a robust optimization framework for drainage operations in high-water-cut tight sandstone gas reservoirs,this study systematically investigates the graded optimization and dynamic adaptation of drainage gas recovery technologies.Production data from a representative tight gas field were first employed to forecast reservoir performance.The predictive reliability was rigorously validated through high-precision history matching,thereby providing a quantitatively consistent foundation for subsequent wellbore optimization.Building on this characterization,a coupled simulation framework was developed that integrates wellbore multiphase flow modeling with nodal analysis based on the Inflow Performance Relationship,IPR,and the Vertical Lift Performance,VLP.This coordinated approach enables comprehensive evaluation of process adaptability and dynamic optimization of foam-assisted drainage,mechanical pumping,and jet pumping systems under evolving water-gas ratio,WGR conditions.The results reveal that a progressively increasing water-gas ratio is the dominant factor driving the transition from chemically assisted drainage methods to mechanically enhanced lifting technologies.A distinct quantitative threshold is identified at WGR≈0.002,beyond which mechanical intervention becomes more effective and economically justified.For mechanical pumping and jet pumping systems,a parameter inversion optimization strategy constrained by the target bottomhole flowing pressure,Pwf,is proposed to ensure stable production while maintaining reservoir drawdown control.In particular,the nozzle-to-throat area ratio of the jet pump is identified as the key governing parameter influencing entrainment capacity and lifting efficiency.Moreover,a configuration characterized by small pump diameter,long stroke length,and low operating speed is demonstrated to satisfy drainage requirements while mitigating torque fluctuations,enhancing volumetric efficiency,and improving pump fillage stability.
文摘China’s enhanced intellectual property rights(IPR)protection framework presents a promising prospect for European SMEs to pursue strategic growth and market expansion within the country’s innovation-driven economy.
基金supported by National Natural Science Foundation of China(Grant No.52474029)National Natural Science Foundation for Young Scientists of China(A)(Grant No.52525403)+2 种基金National Major Science and Technology Projects under the 14th Five-Year Plan(Grant No.2024ZD1405105)Science and Technology Innovation Team Project of Xinjiang Uygur Autonomous Region(Grant No.2024TSYCTD0018)Xinjiang Uygur Autonomous Region.
文摘This study investigates the unsteady flow characteristics of shale oil reservoirs during the depletion development process,with a particular focus on production behavior following fracturing and shut-in stages.Shale reservoirs exhibit distinctive production patterns that differ from traditional oil reservoirs,as their inflow performance does not conform to the classic steady-state relationship.Instead,production is governed by unsteady-state flow behavior,and the combined effects of thewellbore and choke cause the inflowperformance curve to evolve dynamically over time.To address these challenges,this study introduces the concept of a“Dynamic IPR curve”and develops a dynamic production analysis method that integrates production time,continuity across multi-stage state fields,and the interactions between tubing flow and choke flow.This method provides a robust framework to characterize the attenuation trend of reservoir productivity and to accurately describe wellbore flow behavior.By applying the dynamic IPR approach,the study overcomes the limitations of conventional methods,which are unable to capture the temporal variations inherent in shale reservoir production.The proposed methodology offers a theoretical foundation for improved production forecasting,optimization of choke size,and analysis of wellbore tubing characteristics,thereby supporting more effective operational decision-making across different stages of shale reservoir development.
