中东X区块U组致密砂岩压裂过程中的储层保护  

Formation Protection Technique in Tight Gas Reservoir Fracturing in Block X of Middle East

作　　者：尚会昌[1] 李行船[1] 武好杰[1] 

机构地区：[1]中国石化国际石油勘探开发有限公司,北京100083

出　　处：《石油钻探技术》2010年第5期65-70,共6页Petroleum Drilling Techniques

基　　金：国家科技重大专项"中东鲁卜哈里盆地古生界致密砂岩储层压裂改造技术及气藏商业性评价"(编号:2008ZX0531-002-003)部分研究内容

摘　　要：中东X区块的主要目的层U组致密砂岩储层埋藏深(>4 500 m)、温度高(150℃)、压力高(67 MPa)、地应力大(87 MPa)、物性较差(渗透率仅为1.0×10-3μm2),因此,储层改造作业存在很大的困难,对改造过程中的储层保护技术也提出了很高的要求。在介绍中东X区块U组储层基本情况的基础上,分析了U层段的黏土矿物,评价、优选了支撑剂体系,进行了包括压裂液基液配制及性能测试、复合交联体系组成及交联性能测试、破胶剂体系组成及性能、压裂液滤失性能的压裂液体系优选评价试验,并基于储层保护进行了储层改造设计和工艺技术优化。该技术在中东X区块MR-0002S井的储层改造中进行了现场应用,结果表明,返排出的流体黏度逐渐降低,说明压裂液破胶顺利,作业增产达10倍左右。Formation U is the main exploration target in Block X of Middle East.Due to its deep formation depth（〉4 500 m）,high temperature（〉150 ℃）,high formation pressure（67 MPa）,high in-situ stress（87 MPa）,poor physical properties（permeability only of 1.0×10^-3 μm^2）,there is tremendous difficulties in formation stimulation,and the requirements for formation protection during reservoir stimulation is high.After introducing the basic information of U formation of Block X,this paper analyzed the clay minerals,evaluated and optimized the proppant system.The formula of fracturing fluid and its performance were tested,and the compound cross-linked system and its joint performance were tested.Circulation lost of fracturing fluid were evaluated and optimized.For formation protection,formation stimulation was designed and technology was optimized.The application in well MR-0002S shows that the viscosity of the discharged fluid is reduced which indicates that the success of the fracturing fluid gel breaking,and production increased for about 10 times.

关 键 词：水力压裂 压裂液 低渗透储层 致密砂岩 储层保护 

分 类 号：TE258.2[石油与天然气工程—油气井工程] TE258.2