渗吸采油用非交联缔合型清洁压裂液体系  

Non-crosslinked Associative Clean Fracturing Fluid System for Imbibition Oil Recovery

作　　者：任洪达 许成军 孙锡泽 蒲迪[3] 董景锋 郭拥军[2,3] REN Hongda;XU Chengjun;SUN Xize;PU Di;DONG Jingfeng;GUO Yongjun(Engineering Technology Research Institute,Xinjiang Oilfield Branch Company,PetroChina,Karamay,Xinjiang 834000,P R of China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,P R of China;College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,P R of China)

机构地区：[1]中国石油新疆油田分公司工程技术研究院,新疆克拉玛依834000 [2]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [3]西南石油大学化学化工学院,四川成都610500

出　　处：《油田化学》2022年第2期246-251,294,共7页Oilfield Chemistry

基　　金：新疆维吾尔自治区天山青年计划项目“新疆油田钻井防漏堵漏技术研究与应用”(项目编号2018Q101)。

摘　　要：为进一步提高渗吸采油压裂液焖井后的采收率,研究了破胶液中不同残渣含量及稠化剂相对分子质量对渗吸采收率的影响,通过渗吸剂优选及其对非交联缔合型稠化剂(CFZ)增黏、耐温耐剪切、渗吸采收率性能的影响研究,构建优化了一套残渣低、相对分子质量低的渗吸采油非交联缔合型清洁压裂液体系。研究表明:破胶液中残渣含量及相对分子质量越低,对渗吸采收率影响越小。配方为0.3%稠化剂CFZ+0.2%渗吸剂SZX-1+0.06%破胶剂APS的渗吸采油非交联缔合型清洁压裂液体系,在90℃、170 s^(-1)下剪切90 min的黏度为77.43 mPa·s,破胶液在油湿岩心表面接触角为31.6°,油水界面张力为0.66 mN/m,残渣含量为17.2 mg/L,相对分子质量为1.15×104,渗吸采收率为14.8%。该体系可为进一步提高压裂后的渗吸采收率提供理论依据及技术支持。In order to further improve the recovery of imbibition fracturing fluid after well shut-in,the effects of different residue content and molecular weight of the thickener in fracturing fluid gel breaker on imbibition recovery were studied.Through the optimization of imbibition agent and its effects on the viscosity increasing,temperature resistance,shear resistance and imbibition recovery performance of non-crosslinked associative thickener(CFZ),a set of imbibition recovery non-crosslinked associative clean fracturing fluid system with low residue and low molecular weight was constructed and optimized.The results showed that the lower the residue content and molecular weight in gel breaker,the smaller the effect on imbibition recovery.When the system,composed of 0.3%thickener CFZ+0.2%imbibition agent SZX-1+0.06%gel breaker APS,was sheared at the temperature of 90℃and at the shear rate of 170 s^(-1) for 90 min,the viscosity was 77.43 mPa·s.The contact angle of the gel breaker on oil wet surface was 31.6°,the oil-water interfacial tension was 0.66 mN/m,the residue content was 17.2 mg/L and the molecular weight of the thicker in the gel breaker was 1.15×104,the imbibition recovery was 14.8%.The system provided the theoretical basis and technical support for further improving the imbibition recovery after fracturing.

关 键 词：渗吸采油 非交联缔合型稠化剂 清洁压裂液 残渣含量 相对分子质量 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程]