超致密储层流体敏感性实验方法  

The Experimental Methods to Evaluate the Fluids Sensitivity Damage of Ultra-deep and Ultra-tight Gas Reservoirs

作　　者：张杜杰 金军斌[1,2] 李大奇 张栋 金中良 ZHANG Dujie;JIN Junbin;LI Daqi;ZHANG Dong;JIN Zhongliang(State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Beijing,100101;SINOPEC Research Institute of Petroleum Engineering,Beijing,100101;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan,610500;Wupu Drilling Branch of Sinopec North China Petroleum Engineering Co.,Ltd.,Xinxiang,Henan,453700)

机构地区：[1]页岩油气富集机理与有效开发全国重点实验室,北京100101 [2]中石化石油工程技术研究院有限公司,北京100101 [3]西南石油大学油气地质及开发工程国家重点实验室,成都610500 [4]中石化华北石油工程有限公司五普钻井分公司,河南新乡453700

出　　处：《钻井液与完井液》2024年第2期172-177,共6页Drilling Fluid & Completion Fluid

基　　金：国家自然科学基金联合基金“高温高应力井筒失稳机理与控制方法”(U19B6003-05);国家重点研发计划“井筒稳定性闭环响应机制与智能调控方法”(2019YFA0708303);中国博士后科学基金面上资助“深部破碎地层井壁稳定技术研究”(2020M680818)。

摘　　要：超致密储层具有基块致密、黏土矿物丰富等特点,潜在流体敏感性强,准确评价储层流体敏感程度对优选入井工作液性能至关重要。选取超致密气层砂岩岩心,改进了压力衰减法评价储层流体敏感性,并与常规的压力衰减法和改进的稳态流体敏感性实验方法对比分析。结果显示,常规的压力衰减法样品水敏程度为中等偏弱,改进的压力衰减法评价样品水敏程度中等偏强,实验结果与改进的高温高回压测试方法具有一致性,且实验时间缩短近40%。分析认为:改进的压力衰减法能够模拟地层高温环境,原理清楚,结果可靠,新方法弥补了常规压力衰减法工作流体无法高效注入岩心的不足,提高了测试精度,缩短了实验时间,对优化致密油气藏储层损害评价方法具有借鉴意义。Ultra-tight gas reservoirs are characteristic with deep buried depth,high formation temperature and strong potential fluids sensitivity damage,and the ultra-low permeability of matrix lead to the industry standard method not being applied to evaluate the formation fluids sensitivity damage.In this study,sandstone cores from ultra-tight gas layers were selected.Meanwhile,modified pressure decay method was proposed.In addition,the normal pressure decay method and modified steady-state fluid sensitivity test method were used to evaluate the water sensitive damage degree as a comparison.The results indicates that the water sensitivity damage degree obtained by the normal pressure decay method is middle to weak,the water sensitivity damage degree obtained by the modified pressure decay method is middle to strong,which is consistent with the modified steady-state fluid sensitivity test method.Moreover,the experiment time was reduced by nearly 40%.The analysis showed that the modified pressure decay method could simulate the stratum high temperature environment with the clear principle and obtained reliable result.The new method makes up for the deficiency that the normal pressure decay method cannot efficiently inject the working fluid into the core,improves the testing accuracy and shorts the experimental time,and has reference significance for the damage evaluation method of ultra-tight oil and gas reservoir.

关 键 词：超致密 砂岩气藏 高温 高回压 流体敏感性 评价方法 

分 类 号：TE258[石油与天然气工程—油气井工程]