低表面张力滑溜水在低压致密气藏中的应用  

Application of Low Surface Tension Slick Water in Low Pressure Tight Gas Reservoir

作　　者：何定凯 HE Dingkai(Research Institute of Oil and Gas Production Technology,Petrochina Jilin Oilfield Company,Songyuan,Jilin 138000,P R of China)

机构地区：[1]中国石油吉林油田公司油气工程研究院,吉林松原138000

出　　处：《油田化学》2018年第4期634-637,共4页Oilfield Chemistry

摘　　要：低压致密气藏储层渗透率低、孔隙度小、压力系数低,普遍存在因压裂液入侵造成的水敏伤害问题。为了降低压裂液对低压致密气藏储层伤害,提高压裂液返排率,筛选一种配方为0.15%减阻剂XY-205+0.1%助排剂XY-120+0.2%防膨剂XY-63的具有低表面张力的滑溜水体系,并考察了该滑溜水的减阻率、防膨率以及对岩心伤害性能,并进行了现场应用。该滑溜水体系的表面张力为20.12 mN/m、与煤油间的界面张力为1.52 mN/m,最大减阻率达到70.58%,对王府区块HG-01井岩心的防膨率达到90%,滑溜水对岩心伤害可降至14.46%。滑溜水在低压致密气藏现场应用3口井,压裂施工顺利,压后见气速度快,排液4 h见气,返排率61%,取得较好的改造效果。The low pressure tight gas reservoir is characteristic of low permeability,low porosity and low pressure coefficient. The problem of water sensitivity damage caused by fracturing fluid invasion is widespread in the low pressure tight gas reservoir. In order to reduce the damage of fracturing fluid to reservoir and increase the flowback rate of fracturing fluid,the slick water system with low surface tension was selected,composed of 0.15% drag reducer XY-205,0.1% clean up additive XY-120 and 0.2%antiswelling agent XY-63. The drag reducing rate,anti-swelling rate and core damage performance of the slick water were also investigated,and the slick water had been put into field uses. The result showed that the surface tension of the slick water was 20.12mN/m and the interfacial tension between the slick water system and kerosene was 1.52 mN/m,The drag reduction rate of the slick water system was up to 70.58%,and the antiswelling ratio of the core of HG-01 well in Wangfu block was 90%. The core damage caused by slick water was as low as 14.46%. The application of slick water in 3 wells of low pressure tight gas reservoir showed that the fracturing operation was successful,the gas breakthrough rate was fast after fracturing,the flowback rate of slick water was61%,and the gas came out after 4 hours of running slick water. The application of low surface tension slick water in low pressure tight gas reservoir had achieved good results.

关 键 词：水力压裂 滑溜水 低压致密气藏 减阻剂 表面张力 

分 类 号：TE357[石油与天然气工程—油气田开发工程]