摘要
选取中原油田文23储气库储集层标准岩心,开展多周期注采条件下渗透率应力敏感实验,分析了多周期注采渗透率应力敏感变化规律,提出了多周期注采岩石覆压渗透率计算方法,分析了多周期注采储集层渗透率应力敏感对储气库注采能力的影响。研究表明:岩石渗透率保持率随储气库运行周期数增多初期快速下降,后期缓慢降低;净应力上升过程中渗透率应力敏感指数随净应力变化过程数的增多而降低;净应力下降过程中渗透率应力敏感指数基本不随净应力变化过程数的变化而变化;随净应力变化过程数的增多,特定岩石净应力上升过程的渗透率应力敏感指数不断趋近于净应力下降过程的渗透率应力敏感指数;岩石渗透率越低,不可逆渗透率损失率越大,岩石周期应力敏感性越强;岩石渗透率越低,渗透率应力敏感指数越大,岩石应力敏感性越强,渗透率过低的储集层不宜作为储气库选层;储集层渗透率应力敏感性对气井注采能力影响较大,且主要集中在前数个周期。图13表4参21。
Permeability sensitivity to stress experiments were conducted on standard core samples taken from Wen 23 Gas Storage at multi-cycle injection and production conditions of the gas storage to study the change pattern of stress sensitivity of permeability.A method for calculating permeability under overburden pressure in the multi-cycle injection and production process was proposed,and the effect of stress sensitivity of reservoir permeability on gas well injectivity and productivity in UGS was analyzed.Retention rate of permeability decreased sharply first and then slowly with the increase of the UGS cycles.The stress sensitivity index of permeability decreased with the increase of cycle number of net stress variations in the increase process of net stress.The stress sensitivity index of permeability hardly changed with the increase of cycle number of net stress variations in the decrease process of net stress.With the increase of cycle number of net stress variation,the stress sensitivity index of permeability in the increase process of net stress approached that in the decrease process of net stress.The lower the reservoir permeability,the greater the irreversible permeability loss rate,the stronger the cyclic stress sensitivity,and the higher the stress sensitivity index of the reservoir.Low permeability gas zones are not suitable as gas storage regions.Stress sensitivity of reservoir permeability has strong impact on gas well injectivity and productivity and mainly in the first few cycles.
作者
李继强
赵冠群
戚志林
尹冰毅
许寻
方飞飞
杨棽垚
齐桂雪
LI Jiqiang;ZHAO Guanqun;QI Zhilin;YIN Bingyi;XU Xun;FANG Feifei;YANG Shenyao;QI Guixue(The Key Laboratory of Complex Oil and Gas Field Exploration and Development of Chongqing Municipality,Chongqing 401331,China;School of Petroleum Engineering,Chongqing University of Science and Technology,Chongqing 401331,China;Exploration and Development Research Institute of Sinopec Zhongyuan Oilfield Company,Puyang 457000,China)
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2021年第4期835-842,共8页
Petroleum Exploration and Development
基金
重庆市技术创新与应用发展专项面上项目“大型天然气地下储集装备研发”(cstc2020jscx-msxmX0189)。
关键词
气藏型储气库
多周期注采
储集层应力敏感
注采能力
储气库选层
gas storage rebuilt from gas reservoirs
multi-cycle injection and production
reservoir stress sensitivity
injection and production capacity
gas storage layer selection
