低渗透油藏注入水损害储层主控因素研究  

Study on Main Controlling Factors of Reservoir Damage Caused by Injection Water in Low Permeability Reservoir

作　　者：辛春彦 李福堂[1] 黄海龙[1] 朱明璋 XIN Chunyan;LI Futang;HUANG Hailong;ZHU Mingzhang(Research Institute of Petroleum Exploration&Development,Jidong Oilfield Company,PetroChina,Tangshan 063000,China;Sinopec Energy Saving Technology Service Co.,Ltd.,Beijing 100010,China)

机构地区：[1]中国石油冀东油田分公司勘探开发研究院,河北唐山063000 [2]中石化节能技术服务有限公司,北京100010

出　　处：《常州大学学报（自然科学版）》2021年第5期87-92,共6页Journal of Changzhou University：Natural Science Edition

摘　　要：针对南堡油田低渗油藏普遍存在注水压力不断上升、吸水指数降低、产液量下降等油田开发问题,以南堡13-52井低渗储层天然岩心及注入水为研究对象,评价储层敏感性、注入水结垢及固相颗粒堵塞等因素造成的储层渗透率损害程度。敏感性损害实验表明储层水敏损害程度中等偏强;常温及地层温度下注入水离子含量变化表明,地层温度下注入水极不稳定且有大量结垢析出;渗透率损害率随着注入水中固相含量和粒径中值的增加呈线性关系增大,注入水因固相颗粒堵塞引起的渗透率损害率达64.84%。综合研究认为储层水敏、注入水结垢及固相颗粒堵塞是造成冀东油田低渗储层注水困难的主要原因,且固相颗粒堵塞是注入水损害低渗透油藏的主要因素。Aiming at the water injection development problems of low permeability reservoir in Nanpu oilfield,such as increasing pressure of water injection wells,decreasing water absorption index and decreasing liquid production of production wells,the natural core and injected water of low permeability reservoir in Nanpu 13-52 well are studied to evaluate the damage degree of reservoir permeability caused by factors such as reservoir sensitivity,water injection scaling and solid particles blockage.Sensitivity damage experiments show that the degree of reservoir water sensitivity damage is moderately strong;the variation of ion content of injected water at normal temperature and formation temperature indicates that the injected water is extremely unstable and there is a large amount of scale precipitation under the formation temperature;the permeability damage rate increased linearly with the increase of solid content and median particle size in injected water,and the permeability damage rate of injected water due to solid particle blockage reached 64.84%.According to the comprehensive study,reservoir water sensitivity,scale formation of injected water and solid particle blockage are the main reasons for water injection difficulties in low-permeability reservoirs in Jidong oilfield.and solid phase particle blockage is the main factor of injection water damaging low permeability reservoirs.

关 键 词：低渗透 敏感性 结垢 固相含量 渗透率损害率 

分 类 号：TE348[石油与天然气工程—油气田开发工程]