X区块碳酸盐岩油藏非均匀酸蚀工艺研究及应用  

Non-uniform Acid-etched Process in X Block Carbonate Reservoir

作　　者：林强 赵晨宇 曲占庆[2] LIN Qiang;ZHAO Chen-yu;QU Zhan-qing(CNPC Jianghan Oilfield Branch,Qianjiang 433100,Hubei,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,Shandong,China)

机构地区：[1]中国石油江汉油田分公司,湖北潜江433100 [2]中国石油大学(华东)石油工程学院,山东青岛266580

出　　处：《承德石油高等专科学校学报》2024年第5期13-16,29,共5页Journal of Chengde Petroleum College

基　　金：国家重点研发计划项目(页岩储层甲烷原位燃爆压裂理论与技术):2020YFA0711804。

摘　　要：X区块碳酸盐岩油田的开发主要以酸压为主,但单一酸液的酸蚀对地层改造的程度不理想,不能形成有效的增产。针对X区块地区高温高闭合压力条件下酸蚀导流能力不足的问题,利用室内酸蚀导流实验,研究了现场常用单一酸液和多种酸液非均匀酸蚀对酸蚀导流能力的影响,并刻画了酸蚀裂缝的形态特征。研究结果表明:转向酸刻蚀裂缝表面均匀,交联酸和多种非均匀酸蚀可形成溶孔,且多种酸液非均匀酸蚀的溶孔更加复杂多样;非均匀酸蚀形成的复杂酸蚀溶孔在高闭合压力下能有效支撑裂缝,形成较好的渗流通道,导流能力更大。在SHB-X井成功进行了现场实施,非均匀酸化增油效果明显增加,日产量保持稳定,未出现大幅度降低。证明了非均匀酸蚀在X区块油田大规模应用的可行性。The development of X Block carbonate rock oil field depends mainly on the method of acid pressure,but the acid-etched solution of single acid is not ideal for the degree of stratum reconstruction,and can not form an effective yield increase.In view of the problem of insufficient acidetched conductivity under the conditions of high temperature and high closing pressure in X Block area,this paper studies the effect of single acid solution and non-uniform acidification on the acidetched conductivity by using indoor acid-etched experiment,and the morphological characteristics of the acid-etched crack are characterized.The results show that the surface of the crack is uniform in the acid etching,and the cross-linked acid and non-uniform acidification can form dissolved pores,but the non-uniform acidification is more complicated and diverse;the complex acid-etched hole formed by non-uniform acidification is under high closing pressure.It can effectively support the cracks,form a better seepage channel,and has a larger conductivity.The field has been successfully implemented in SHB-X Well.The non-uniform acidification can significantly increase oil production,and the daily output has remained stable without significant reduction,which proves the feasibility of non-uniform acidification in large-scale application in X Block Oilfield.

关 键 词：碳酸盐岩 非均匀酸蚀 酸蚀溶孔 酸蚀导流能力 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]