低渗储层新型防水锁剂的研究及应用  

Research and application of new waterproof locking agent for low permeability reservoir

作　　者：耿学礼 吴智文 黄毓祥 苏延辉 史斌 郑晓斌 GENG Xueli;WU Zhiwen;HUANG Yuxiang;SU Yanhui;SHI Bin;ZHENG Xiaobin(CNOOC EnerTech-Drilling & Production Co., Tianjin 300451, China;Tianjin Branch of CNOOC Ltd., Tianjin 300459, China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300451 [2]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《断块油气田》2019年第4期537-540,共4页Fault-Block Oil & Gas Field

基　　金：中海油能源发展股份有限公司“非常规油气勘探开发关键技术”重大专项子课题“煤层气储层伤害评价与保护技术研究”(HFXMLZ-CJFZ1311)

摘　　要：低渗储层在钻井、完井、修井过程中的水锁伤害,一般采用在入井液体中加入防水锁剂的方式预防。但传统的防水锁剂多为单一的表面活性剂,不能同时降低气液、液液和固液的界面张力,且耐盐性能较差。针对这一问题,研发了一种新型防水锁剂DF-FSS02。室内实验表明:射孔液中加入防水锁剂DF-FSS02,搅拌后不起泡;DF-FSS02质量分数为0.10%时表、界面张力分别下降56.92%和86.52%,质量分数为5.00%时可以解除水锁伤害,质量分数为0.20%时可以预防水锁伤害,且与地层水、射孔液等的配伍性良好。防水锁剂DF-FSS02在临兴区块首批应用了5口井,其中4口井均达到预测配产。在室内实验和现场应用中,DF-FSS02均表现出良好的降低水锁伤害作用,这对低孔低渗油气田的开发具有借鉴意义。In the process of drilling, finishing and work-over, water blocking damage in low permeability reservoir is usually prevented by adding anti-water blocking agent into the working fluid. The traditional anti-water blocking agent was a surface active agent and cannot simultaneously reduce the gas-liquid, liquid-liquid and solid-liquid interfacial tension, and salt tolerance was poor. In order to solve this problem, a compound fluorocarbon anti-water blocking agent DF-FSS02 was developed. Laboratory experiments show that control fluid joined with anti-water blocking agent DF-FSS02 does not blister when stirring. When the amount of dosage is 0.10%, the surface tension and the interfacial tension are decreased by 56.92% and 86.52%, respectively. Water blocking damage can be relieved when the dosage of DF-FSS02 is added up to 5.00%;water blocking damage can be prevented by adding 0.20%, and DF-FSS02 has good compatibility with formation water and control fluid. The anti-water blocking agent is currently used in five wells in Lingxing Block, of which four wells have reached forecast proration production. The anti-water blocking agent has shown good effect on reducing the water blocking damage in both laboratory and field applications, and has remarkable significance for the development of low porosity and low permeability oil and gas fields.

关 键 词：低渗储层 防水锁剂 表面张力 界面张力 储层伤害 

分 类 号：TE257[石油与天然气工程—油气井工程]