页岩微纳米孔缝封堵评价方法研究  

Research on Evaluation Methods for Plugging Micro and Nano Pores in Shale

作　　者：付旻皓 王平全[1] 鲁劲松 苏俊霖[1] 冉超 武元鹏[1,2] Fu Minhao;Wang Pingquan;Lu Jinsong;Su Junlin;Ran Chao;Wu Yuanpeng(State Key Laboratoray of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Sichuan,610500;School of New Energy and Materials,Southwest Petroleum University,Sichuan,610500;Guangzhou Marine Geological Survey,Guangdong,510075)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川610500 [2]西南石油大学新能源与材料学院,四川610500 [3]广州海洋地质调查局,广东510075

出　　处：《当代化工研究》2023年第20期169-172,共4页Modern Chemical Research

基　　金：国家自然科学基金面上项目“页岩水基钻井液封堵内固强体机理与方法”(项目编号:51974270);中国石油-西南石油大学创新联合体科技合作项目“降低长水平段复杂工况及井下事故的配套技术研究”(项目编号:2020CX040201)。

摘　　要：针对微纳米级孔缝的超低孔超低渗页岩地层,国内外缺少可靠的方法对其封堵进行评价。实验以延长组长7段页岩为参考对象,测试了页岩的岩性、孔隙特征等数据;通过研究膨润土、各类钻井液处理剂和API重晶石对泥饼厚度及渗透率的影响,构建了模拟页岩的“标准厚泥饼”封堵评价方法,厚泥饼平均厚度为10.05mm、平均渗透率为4.81×10^(-4)mD,且具有良好的重现性,能定量评价微纳米封堵剂SPA-1在甲酸钾钻井液体系中的封堵效果,解决了页岩封堵剂及水基钻井液封堵效果评价难题,对保障页岩井壁稳定具有指导意义。For ultra-low porosity and ultra-low permeability shale formations with micro-nano pores and fractures,there are no reliable methods at home and abroad to evaluate their plugging.Taking the shale of the Chang 7 member of the Yanchang Formation as the reference object,the experiment tested the lithology and pore characteristics of the shale;by studying the effects of bentonite,various drilling fluid treatment agents and API barite on the mud cake thickness and permeability,constructed a"standard thick mud cake"plugging evaluation method for simulating shale.The average thickness of the thick mud cake is 10.05 mm,the average permeability is 4.81×10^(-4)mD,with good repeatability.It can quantitatively evaluate the plugging effect of micro-nano plugging agent SPA-1 in potassium formate drilling fluid system,which solves the difficult problem of evaluating the plugging effect of shale plugging agent and water-based drilling fluid,and has guiding significance for ensuring the stability of the shale wellbore.

关 键 词：页岩 水基钻井液 封堵评价 微纳米孔缝 超低渗透 

分 类 号：TE254[石油与天然气工程—油气井工程]