Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (5): 178-188.doi: 10.12108/yxyqc.20240517

• PETROLEUM ENGINEERING AND OIL & GAS FIELD DEVELOPMENT • Previous Articles    

Natural depletion characteristics and pressure maintenance strategies of faultcontrolled fracture-cavity condensate gas reservoirs in Shunbei Oilfield

SU Hao1, GUO Yandong1, CAO Liying1, YU Chen1, CUI Shuyue1, LU Ting1, ZHANG Yun2, LI Junchao3   

  1. 1. Sinopec Research Institute of Petroleum Exploration and Production, Beijing 100083, China;
    2. Research Institute of Exploration and Production, Sinopec Northwest Oilfield Company, Urumqi 830011, Xinjiang, China;
    3. College of Mechanical Engineering, Xi'an Shiyou University, Xi'an 710065, China
  • Received:2023-04-03 Revised:2023-06-18 Online:2024-09-01 Published:2024-09-04

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Abstract: The fault-controlled fracture-cavity condensate gas reservoirs in Shunbei Oilfield have special geological conditions and are difficult to develop. Based on the actual parameters of the gas reservoirs in Shunbei Oilfield，a quantitative analysis method integrated modeling and simulation was used to characterize the natural depletion of fault-controlled fracture-cavity condensate gas reservoirs，and corresponding pressure maintenance strategies were formulated. The results show that：（1）A hierarchical modeling method based on geophysical attribute depiction was adopted for different types of facies to obtain a fused three-dimensional reservoir facies model. Based on the data of wave impedance，logging data，and well testing interpretation，a three-dimensional porosity model and permeability model was obtained by using human-computer interaction and gradual nesting method. On this basis of two models，combined the fluid model obtained from PVT experiments，a multi-component numerical simulation model representing the characteristics of the fault-controlled fracture-cavity condensate gas reservoirs in the region can be obtained.（2）Retrograde condensation and stress sensitivity are two major factors that constrain the natural depletion development effect of such condensate gas reservoirs. The retrograde condensation shortens the stable production time of oil，increases the gas oil ratio，and reduces cumulative oil production. Fractures in reservoirs with stress sensitivity may close under certain stress conditions，resulting in the difficulty to produce some reserves connected to the fractures.（3）CH4 is the optimal injection medium for pressure maintenance development，and the best injection effect occurs when it is injected slightly above the dew point pressure. Injection-production rate and injection time are positively correlated with the oil production increment，but the oil replacement rate decreases as the injection volume increases. For the injection-production well group，the scheme which adopts continuous injection and production mode first and then switch to pulse injection and continuous production mode is the best strategy for increasing oil production while preventing gas channeling. For the isolated well，the huff and puff injection and production method can be used to improve the condensate oil recovery. Further，both the injection and production wells are deployed in a cave，which is easier to make the injected gas act on the main reserves in the cave and drive out the main reserves in a directional way. Meanwhile，ensuring sufficient distance between injection and production wells is beneficial for preventing gas channeling and increasing the swept volume.

Key words: numerical model, natural depletion, retrograde condensation, stress sensitivity, pressure maintenance development, development strategy, enhanced oil recovery, condensate gas reservoir, fault-controlled fracture-cavity reservoir, Shunbei Oilfield

CLC Number: 

  • TE319
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