储气库固井水泥石渗透率演化规律  

Variation law of cementing stone permeability in gas storage

作　　者：完颜祺琪 毛涛 王云[1] 黄盛 李康[1] 李早元 苏东华[2,3] WANYAN Qiqi;MAO Tao;WANG Yun;HUANG Sheng;LI Kang;LI Zaoyuan;SU Donghua(Underground Oil and Gas Storage Research Center,Research Institute of Petroleum Exploration and Development,CNPC,Beijing 100083,China;Petroleum Engineering School,Southwest Petroleum Univeristy,Chengdu 610500,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Southwest Petroleum Univeristy),Chengdu 610500,China)

机构地区：[1]中国石油勘探开发研究院地下储库研究中心,北京100083 [2]西南石油大学石油与天然气工程学院,四川成都610500 [3]油气藏地质及开发工程全国重点实验室(西南石油大学),四川成都610500

出　　处：《断块油气田》2024年第5期930-935,共6页Fault-Block Oil & Gas Field

基　　金：国家自然科学基金面上项目“固井水泥环界面密封损伤机理与改善机制研究”(52274010);中国石油集团科学技术研究院有限公司项目“氦气在固井水泥环运移渗漏规律测试研究”(RIPED.CN-2023-CL-26)。

摘　　要：固井水泥石渗透率是影响储气库长效密封的关键参数。利用超低渗气体渗透率测量仪,文中对水泥石开展了不同围压和恒定围压、升降有效应力下的渗透率测试,分析了不同压力条件对水泥石渗透率的影响机制;采用数学拟合方法,揭示了水泥石渗透率演化规律。研究结果表明:水泥石渗透率随围压增加而降低;围压恒定、有效应力升降过程中,水泥石渗透率先降低后增大,且有效应力降低阶段水泥石渗透率高于其升高阶段,水泥石内部结构损伤是该差异的主要原因;线性叠加法结合现有渗透率模型计算的水泥石渗透率结果偏高,新建的数学模型能够考虑围压和有效应力的影响,可有效预测不同压力条件下的储气库水泥石渗透率变化。研究结果为注采服役期储气库固井水泥石渗透率预测提供了一个新方法,可为储气库固井水泥环渗漏分析提供关键参数。The permeability of the cementing stone is a key parameter affecting the long-term sealing of gas storage.In this study,the permeability of the cementing stone was tested by using the ultra-low permeability gas permeability measuring instrument under different confining pressure,constant confining pressure and increasing-decreasing effective stress,and the influence mechanism of different pressure conditions on cementing stone permeability was analyzed.The variation law of cementing stone permeability was revealed through a mathematical fitting method.The results show that the permeability of cementing stone decreased with the increase of confining pressure.Under constant confining pressure and with the increase and decrease of effective stress,the permeability of cementing stone firstly decreased and then increased,and due to the internal structure damage of cementing stone,the permeability of cementing stone in the effective stress decrease stage was higher than that in its increase stage.The permeability of cementing stone calculated by the linear superposition method combined with the existing permeability model was higher than the actual permeability test results.The new mathematical model considered the influence of confining pressure and effective stress,and could accurately predict the change of cementing stone permeability under different pressure conditions in gas storage.The research results provide a novel method for prodicting the cementing stone permcability in gas storage during the injection-production serice period,which can provide key parameters for percolation analysis of the cementing sheath in gas storage.

关 键 词：固井 水泥石 渗透率 演化规律 储气库 

分 类 号：TE256[石油与天然气工程—油气井工程]