摘要
国内某气田Y1组气藏属于典型的中-低孔、中-低渗储层、埋藏深、温度高（135℃-150℃）、存在强水锁强水敏伤害,平均水敏指数78.4%,平均水锁伤害率83.9%,且为含凝析油气藏,凝析油含量最高达40%,属于复杂气藏。该区块作业工况条件差,井下管柱结构复杂,加上压裂技术在该区块的研究及应用处于起步阶段,压裂改造难度较大。室内通过开展大量研究工作,研发、筛选出水锁处理剂、抗凝析油起泡剂、高效黏土稳定剂等添加剂产品,形成了一套适合该气田Y1组气藏的压裂液体系。室内评价结果表明,该压裂液体系在150℃、170 s-1下,连续剪切90 min,黏度保持在100 mPa·s左右；破胶剂过硫酸铵加量0.02%,残渣含量为363 mg/L,压裂液体系对储层强水锁、强水敏岩心基质渗透率平均损害率为18.4%,对于强敏感性岩心,属于较低伤害压裂液体系。成功完成了该气田首次压裂施工,共计完成8口井现场试验,取得了很好的增产效果。
Y1 group gas reservoir is a typical middle- low porosity,middle- low permeability reservoir. It is a complex gas reservoir,has complicated characteristics such as deep buried depth,high temperature( 135 ~ 150℃),strong water blocking and water sensitivity damage,the water sensitivity index is78. 4% and average water blocking damage index is about83. 9%. The study and application of fracturing technology in Y1 group are still in its initial stage. The poor working conditions and the complex down- hole string structure enhance the difficulty of fracturing operation. Water blocking agent,foaming agent and clay stabilizer were developed to form a fracturing fluid system for Y1 group gas reservoir. The laboratory results indicated that the viscosity of this fracturing fluid system was about100 m Pa· s under 170s- 1 continual shearing for 90 min at150℃,the concentration of APS was 0. 02%,the residue content was 363 mg / L,and the average permeability damage of core with strong water sensitivity and water blocking damage was18. 4%. The fracturing fluid system was applied successfully in8 wells of Y1 group gas reservoir and the yield- increasing effect was remarkable.
出处
《钻采工艺》
CAS
北大核心
2015年第2期59-62,9,共4页
Drilling & Production Technology
基金
中国石油集团川庆钻探工程有限公司科技攻关项目
低渗透油气田勘探开发国家工程实验室专项"高温深井压裂液体系开发研究"(项目编号2010-43)
关键词
复杂气藏
强水敏
水锁
压裂液
complex gas reservoir,water sensitivity,water blocking,fracturing fluid
作者简介
汪小宇（1982-），工程师，硕士，2007年毕业于长江大学化学与环境工程学院，现从事油气田开发相关的研究工作。地址：（710021）西安未央区长庆兴隆园小区钻采工程技术研究院，电话：029—86594877，13891916036，E—mail：wxy—gcy@cnpc．com．cn
