自生二氧化碳络合酸化体系的性能研究  

Performance Study on Authigenetic CO_2 of Complex Acidizing System

作　　者：郑延成[1] 黄倩[1] 贾跃立[2] 

机构地区：[1]长江大学化学与环境工程学院,湖北荆州434023 [2]河南油田分公司石油工程技术研究院,河南南阳473132

出　　处：《石油天然气学报》2010年第5期21-24,59,共5页Journal of Oil and Gas Technology

基　　金：国家"973"规划项目(G19990225)

摘　　要：针对河南油田老区块酸化增注效果逐渐变差的问题,以长链二元羧酸和碳酸盐为主剂开展了自生二氧化碳深部解堵技术研究。在评价回注污水、模拟油对多段岩心的水相渗透率影响的基础上,研究了自生CO2对无机物、有机物的解堵效果,以及CO2与酸液配合使用顺序对长岩心渗透率的影响。结果表明,污染物注入量越大,水相渗透率越低,注入10PV以后,渗透率降低30%～70%;注入自生CO2段塞可以有效清除有机物的堵塞,使水相渗透率提高3～4倍。CO2与酸液配合使用可大幅提高渗流能力和有效作用深度,对重复酸化的储层也具有较好的增注效果。还讨论了酸与CO2的注入顺序所适应的条件。In allusion to the problem of worsening well stimulations in the eastern maturing wellblocks of Henan Oilfield,deep plug removal technology with CO2 produced by the reaction of dicarboxylic acid and carbonate in formation and acidization were studied.On the base of evaluation of plugging ability of injecting sewage and simulation oil to reservoir,the effect of CO2 produced in formation and injecting sequence of CO2 and acid on plug removal was studied.The results show that water permeability of series core reduces by 30%～70% after injecting fluids over 10 pore volume,inorganic and organic plugging can be removed by CO2 injection,especially oil plugging can be removed to enhance water permeability to 3～4 times that of oil.CO2 used with acid can improve permeability of low-permeability reservoir after reacidizing and deep acidizing.In addition,suitable condition of CO2 and acid is discussed.

关 键 词：增注技术 酸化 解堵 CO2 络合表面活性剂 低渗储层 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]