与酸化联作的堵水技术  

A Combined Technique of Water Blocking and Formation Acidizing,

作　　者：蒲万芬[1,2,3] 陈刚[1,2,3] 胡书宝 陈铁龙[1,2,3] 

机构地区：[1]西南石油学院石油工程系 [2]华北油田采油五厂 [3]石油工程系

出　　处：《西南石油学院学报》1997年第3期43-48,共6页Journal of Southwest Petroleum Institute

基　　金：国家"863"项目

摘　　要：介绍与酸化处理联合作业的丙烯酰胺（ＡＭ）与低级醛就地共聚合堵水体系（ＸＮ－ＰＰ）以及先堵后酸的工艺技术。室内实验着重进行堵剂与自生酸的酸敏性试验，研究与油藏环境条件有关的堵剂性能，考查堵剂对大孔道的选择注入性，并对前置液（弱凝胶体）性质作了相关评价。结果表明，堵剂在高盐（１．４×１０５ｍｇ／ｌ）环境和高温（１２０℃）条件下具有良好的耐酸性、高强度性和堵水效果，在一定条件下堵水剂原液还有良好的选择进入性，即优先进入出水层位。堵水及酸化联作技术在矿场进行了２口井的先导性试验，实施的油藏为恶劣油藏，温度１２０℃、矿化度１０～１２×１０４ｍｇ／ｌ，产水率接近１００％。经ＸＮ－ＰＰ体系堵水和自生酸酸化联合作业后，两口井均达到了控水增油的目的，平均含水下降５０％，分别增油３３８８和５４７ｔ，且目前继续有效，取得了明显的经济效益。This paper introduces a novel technique in which water blocking technique is combined with acidizing treatment. The blocking system, XN-PP, is made of AM and a kind of small molecular aldehyde. These two components can undergo co-polymerization and form a gel with high viscosity and strength in host reservoirs where the temperature is 110 - 120℃ and the total salinity is 9-12×105 mg/l. The acid resistance of the blocking agent to self-generating acids was experimentally studied, the blocking ability of the agent under reservoir conditions and the optimum injectivity to large pore channels were investigated, and the protective effect of the preflush on the agent was evaluated. The results indicate that the gel is tolerant of the acids, and it has not only high strength but also high efficiency in water shutoff. A preliminary test of the technique was carried out in two wells in an oilfield. Oil production was greatly enhanced and water production effectively controlled for both wells.

关 键 词：酸化联作 堵水 油井 

分 类 号：TE358.3[石油与天然气工程—油气田开发工程]