塔24致密油试验区不同压裂破胶液焖井效果评价  

Evaluation of well plugging effect of different fracturing gel breaking fluids in Ta 24 tight oil test area

作　　者：蒋建方 黄登铸[1,2] 唐珊 祁生金 姜杰 褚占宇 刘金栋 JIANG Jianfang;HUANG Dengzhu;TANG Shan;QI Shengjin;JIANG Jie;CHU Zhanyu;LIU Jindong(Unconventional Petroleum Research Institute,China University of Petroleum,Beijing 102249,China;Key Laboratory of Ministry of Education in Petroleum Engineering,China University of Petroleum,Beijing 102249,China)

机构地区：[1]中国石油大学非常规油气科学技术研究院,北京102249 [2]中国石油大学石油工程教育部重点实验室,北京102249

出　　处：《石油化工应用》2022年第7期38-44,共7页Petrochemical Industry Application

基　　金：“十三五”国家科技重大专项课题:低渗-致密油藏高效提高采收率新技术,项目编号:2017ZX05009-004。

摘　　要：大庆塔24试验区致密储层孔隙孔喉小,近年焖井作为一种减小压裂过程中伤害的工艺得到应用。为明确大庆常用胍胶、高分子聚合物和阳离子表面活性剂压裂破胶液在该区块焖井的适应性,依据SY/T 5107—2005《水基压裂液性能评价方法》在储层温度下(90℃)采用岩心驱替流动仪进行了注入液损害实验和焖井工艺适应性评价实验,并对焖井前后岩心润湿角进行测量和对比。岩心损害实验表明:胍胶、高分子和表面活性剂三种破胶液对岩心渗透率的损害率分别为18.54%、16.20%和-7.83%,胍胶对岩心渗透性损害比高分子的大,而阳离子表面活性剂破胶液提高了岩心渗透性。分别用上述三种破胶液模拟焖井2 h,3 d,15 d,30 d,结果显示:30 d后渗透率损害率对应为14.74%、7.69%和-9.82%;对比焖井是否降低岩心渗透率损害程度,焖井30 d三种破胶液对岩心渗透率损害程度各自减少3.80%、8.51%、-1.99%,高分子聚合物破胶液焖井30 d后降低岩心渗透率损害幅度最大。润湿角实验表明:上述三种压裂破胶液焖井后,岩心润湿角增幅分别为24.24%、48.39%、112.5%,表面活性剂压裂破胶液增加岩心润湿角幅度最大。The pore throat of tight reservoir in Daqing Ta 24 test area is small.In recent years,the boring well has been applied as a process to reduce the damage during fracturing.In order to clarify the adaptability of guanidine gum,polymer and cationic surfactant fracturing gel breaking fluid commonly used in Daqing in this block.According to the SY/T 5107—2005 water-based fracturing fluid performance evaluation method,the core displacement flow meter was used to carry out the injection fluid damage experiment and the evaluation experiment of the well stuffing process adaptability at the reservoir temperature(90°C),and the core wetting angle before and after the well stuffing was measured and compared.Core damage experiments show that the damage rates of guanidine gum,polymer and surfactant gel breaking fluids to core permeability are 18.54%,16.20%and-7.83%,respectively.The damage of guanidine gum to core permeability is greater than that of polymer,while the cationic surfactant gel breaking fluid improves the core permeability.The above three kinds of gel breaking fluids were used to simulate the well plugging for 2 h,3 d,15 d and 30 d,respectively.The results showed that the permeability damage rates after 30 d were 14.74%,7.69%and-9.82%,respectively.Compared with whether the plugging well reduces the damage degree of core permeability,the damage degree of three kinds of gel breaking fluids on core permeability after 30 d of plugging well decreases by 3.80%,8.51%and-1.99%respectively,and the damage degree of polymer gel breaking fluid on core permeability after 30 d of plugging well is the largest.The wetting angle experiment shows that after the above three kinds of fracturing gel breaking fluid are stuffed,the increase of core wetting angle is 24.24%,48.39%and 112.5%,respectively.The increase of core wetting angle by surfactant fracturing gel breaking fluid is the largest.

关 键 词：焖井 渗透率损害率 岩石润湿性 压裂液 致密油 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程]