深圳大学学报（理工版）2026，Vol.43Issue(3)：273-280,8.DOI:10.3724/SP.J.1249.2026.03273
低渗致密裂缝发育气藏衰竭开采底水水侵规律
Bottom-water invasion behavior during depletion of fractured tight gas reservoirs with low permeability
摘要
Abstract
The DX gas reservoir is characterized by ultra-high pressure,extremely low porosity and permeability,well-developed fractures,and a strong bottom-water drive.During depletion,the decline in formation pressure intrudes rapid bottom-water invasion through fracture networks,resulting in early water breakthrough and significant trapping of natural gas within micro-fractures and pore spaces,thereby reducing overall recovery.To investigate the bottom-water invasion behavior in fractured tight gas reservoirs,physical simulation experiments were conducted under high-temperature and ultra-high-pressure conditions(136℃and 106 MPa)using full-diameter fractured core samples.The effects of depletion rate and aquifer sizes on key indicators,including recovery factor,water-gas ratio,water-free production period,and gas production per unit pressure drop,were systematically analyzed.Results indicate that both increasing aquifer size and accelerating depletion rate lead to higher water production,increased water-gas ratio,shortened water-free period,and reduced gas recovery.Aquifer size exerts a significantly stronger influence than the depletion rate.Specifically,increasing the aquifer size from 4.5 to 20.0 times the hydrocarbon pore volume results in a nearly tenfold increase in cumulative water production,an rise in water breakthrough pressure by 18 MPa,and a value of 21.61%reduction in gas recovery.In contrast,doubling the depletion rate results in approximately a twofold increase in cumulative water production,a 6 MPa increase in breakthrough pressure,and a 10.97%reduction in recovery.These findings indicate that appropriate control of rational depletion rate and effective water management strategies are critical for improving economic performance of fractured tight gas reservoirs.This research provides a crucial theoretical and experimental basis for understanding and managing bottom-water invasion and offers significant practical guidance for optimizing development strategies in fractured gas reservoirs.关键词
油气田开发/超高压/衰竭开采/衰竭速度/水体大小/水侵规律/裂缝发育气藏Key words
oil-gas field development/ultra-high pressure/depletion development/depletion rate/aquifer size/water invasion behavior/fractured gas reservoir分类
能源科技引用本文复制引用
杜建芬,王家树,郭平,田浩,王恒,陈啸博..低渗致密裂缝发育气藏衰竭开采底水水侵规律[J].深圳大学学报（理工版）,2026,43(3):273-280,8.基金项目
Natural Science Foundation of Sichuan Province(2024NSFSC2012) （2024NSFSC2012）
China National Petroleum Corporation"the 14th Five-Year Plan"Prospective Fundamental Major Science and Technology Project(2021DJ3301) 四川省自然科学基金资助项目(2024NSFSC2012) （2021DJ3301）
中国石油集团公司"十四五"前瞻性基础性重大科技资助项目(2021DJ3301) （2021DJ3301）
