新型乳化酸选择性酸化技术  

Selective acidizing technique of novel emulsified acid

作　　者：熊春明[1] 周福建[1] 马金绪[2] 石阳[1] 杨贤友[1] 丛生伟[2] 何启平[3] 

机构地区：[1]中国石油勘探开发研究院 [2]中国石油青海油田公司 [3]中国石油天然气集团公司四川石油管理局

出　　处：《石油勘探与开发》2007年第6期740-744,共5页Petroleum Exploration and Development

基　　金：国家重点基础研究发展计划"973"项目"低效气藏高效改造与保护的基础研究"(2001CB209107)

摘　　要：常规酸化过程中,酸液优先进入含水饱和度高的孔道,常使含水孔道增大,而对含油孔道酸化效果较差,因此,设计了一种新型选择性乳化酸体系,使酸液能够优先进入含油饱和度高的层段并对其改造。新型选择性乳化酸体系进入储集层与水相遇时黏度增大,而与原油相遇时黏度降低;岩心流动实验表明,经该酸液体系酸化后,含油岩心渗透率平均提高96.1%,而含水岩心渗透率仅提高10.1%。实验表明,新型乳化酸对储集层岩心具有良好的缓速性能和保护储集层性能。经青海尕斯库勒油田3口井应用,取得了良好的应用效果,新型乳化酸改造后平均单井日增油8.5 t,含水率下降3.5%。室内研究和现场应用效果表明,新型乳化酸体系对储集层具有良好的选择性酸化改造功能。In the conventional acidization, acid fluid first flows into the pore paths of high water saturation, and it usually broadens the pore paths filled with water. However, the acidification isn＇t good for the pore paths filled with oil. To solve this problem, especially in heterogeneous reservoirs, this paper designs a new-style selective emulsified acid system whose viscosity will increase when it meets water and decrease when it meets oil in reservoirs. The core flow experiment shows that the system increases the permeability of oil-saturated cores by 96. 1% on average, and increases the permeability of water-saturated cores only by 10. 1%. The novel selective emulsified acid system has better retarding and protective capabilities to reservoirs. The acid fluid system has been used in 3 wells in the Gasikule oil field in Qinghai. After acidization, the average oil growth of each well is 8.5t per day, and the water cut decreases by 3.5%.

关 键 词：新型乳化酸 选择性酸化 非均质储集层 岩心实验 尕斯库勒油田 

分 类 号：TE258[石油与天然气工程—油气井工程]