基于裂缝介质转变为多孔颗粒介质的调剖方法与矿场应用  

The method of profile control based on the transformation of fracture media into porous particle media and its field application

作　　者：王成俊 张磊[2,3,4] 展转盈 倪军[5] 高怡文 王维波 WANG Chengjun;ZHANG Lei;ZHAN Zhuanying;NI Jun;GAO Yiwen;WANG Weibo(College of Chemistry and Chemical Engineering,Xi′an Shiyou University,Xi′an 710065,China;Key Laboratory of Theory and Technology of Petroleum Exploration and Development in Hubei Province,China University of Geosciences,Wuhan 430074,China;Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil&Gas Reservoirs,Xi′an Shiyou University,Xi′an 710065,China;Xi′an Key Laboratory of Tight oil(Shale oil)Development,Xi′an Shiyou University,Xi′an 710065,China;Research Institute of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi′an 710065,China)

机构地区：[1]西安石油大学化学化工学院,陕西西安710065 [2]中国地质大学(武汉)油气勘探开发理论与技术湖北省重点实验室,湖北武汉430074 [3]西安石油大学陕西省油气田特种增产技术重点实验室,陕西西安710065 [4]西安石油大学西安市致密油(页岩油)开发重点实验室,陕西西安710065 [5]陕西延长石油(集团)有限责任公司研究院,陕西西安710065

出　　处：《断块油气田》2022年第5期709-713,共5页Fault-Block Oil & Gas Field

基　　金：国家重点研发计划项目“CO_(2)驱油技术及地质封存安全监测”(2018YFB0605500);陕西省重点研发计划一般项目(工业领域)“改善CO_(2)流度增稠驱油技术与应用”(2021GY-141);陕西省油气田特种增产技术重点实验室开放基金项目“低渗透油藏新型水凝胶调剖剂的研发与提高采收率机理研究”(KFJJ-TZ-2020-6);西安市致密油(页岩油)开发重点实验室开放基金项目“页岩油热流体-超临界CO_(2)吞吐提高采收率机理研究”(XSTS-202004)。

摘　　要：为了实现对大裂缝水窜通道的高效封堵,提高低渗透油藏的水驱效果,开展了凝胶颗粒与聚合物本体凝胶联合封堵技术研究。先利用凝胶颗粒将大裂缝通道转变为多孔颗粒介质通道,再利用聚合物本体凝胶封堵颗粒介质间的通道。结果表明:对于开度为1.8 mm的裂缝,凝胶颗粒在粒径为2.5 mm、质量浓度为8000 mg/L、注入速度为1.0 mL/min的注入参数条件下,可密集均匀地分布在裂缝通道中,并呈活塞式均匀向前推进;当凝胶颗粒充填整条裂缝后,所形成的多孔颗粒介质的渗透率为2300.0×10^(-3)μm^(2)。基于裂缝性岩心基质的渗透率,要求优选的聚合物本体凝胶在渗透率为2300.0×10^(-3)μm^(2)的多孔颗粒介质中的封堵压力梯度应大于3.3 MPa/m,从而启动基质中的流体。以此为依据,所需聚合物本体凝胶的强度应大于66 Pa,所用的聚合物本体凝胶的组成为质量浓度4000 mg/L的HPAM+质量浓度150 mg/L的Cr^(3+)。这一调剖方法在延长油田5088-3井组取得了较好的增油效果,可以为裂缝性低渗透油藏的可持续高效开发提供技术支撑。In order to efficiently plug the large fracture water channels and enhance oil recovery of the fractured low-permeability reservoirs by water flooding,the combination plugging technology of gel particles and polymer gels is studied.Firstly,the large fracture channel is transformed into a porous particle media channel by using gel particles,and then the polymer gel is used to plug the particle medium channel.The results show that the gel particles can be densely and uniformly distributed in the fracture channel with the aperture of 1.8 mm under the injection parameters of particle size of 2.5 mm,concentration of 8,000 mg/L and flow rate of 1.0 mL/min.Besides,the gel particles advance evenly in a piston-like manner in the fracture channel.When the whole fracture is filled with the gel particles,the permeability of the formed porous particle media is 2,300.0×10^(-3)μm^(2).According to permeability of fractured core,the plugging pressure gradient of the preferred polymer gel in the porous media with the permeability of 2,300.0×10^(-3)μm^(2) is required to be greater than 3.3 MPa/m so as to start fluid in the matrix.Based on this,the strength of the required polymer gel should be more than 66 Pa and the composition of the used polymer gel is 4,000 mg/L HPAM and 150 mg/L Cr^(3+).The method of profile control achieved a better effect of oil increasing in 5088-3 well group of Yanchang Oilfield,which can provide a technology support for the sustainable and efficient development of fractured low-permeability reservoirs.

关 键 词：大尺度裂缝 介质转变 多孔颗粒介质 聚合物本体凝胶 注入参数 

分 类 号：TE348[石油与天然气工程—油气田开发工程]