新型碳酸盐岩储层酸化解堵体系合成及解堵影响因素分析  

Formulation of a New Acid Fluid for Blocking Removal in Carbonate Formations and Analysis of Factors Affecting Blocking Removal

作　　者：钟宝鸿 钟壮壮 高宇田 ZHONG Baohong;ZHONG Zhuangzhuang;GAO Yutian(Xiasiwan Bay Oil Production Plant,Yanchang Petroleμm(Group)Co.,Ltd.,Yanan,Shaanxi 716000;Dingbian Oil Production Plant,Yanchang Petroleμm(Group)Co.,Ltd.,Yulin,Shaanxi 718600)

机构地区：[1]延长油田股份有限公司下寺湾采油厂,陕西延安716000 [2]延长油田股份有限公司定边采油厂,陕西榆林718600

出　　处：《钻井液与完井液》2021年第3期365-370,共6页Drilling Fluid & Completion Fluid

基　　金：国家自然科学基金子项目“泥页岩生烃演化过程中的油气滞留效应及对其含油气性的影响”(41572106);陕西省“13115”科技创新工程“陕西省特低渗透油气田勘探与开发工程技术研究中心”(2010ZDGC-15)联合资助。

摘　　要：针对碳酸盐岩储层钻井过程中岩屑及钻井液颗粒堵塞储层喉道严重现象,基于有机化学理论和酸化体系制备原则合成了一类新型碘磺酸乙酯并配制新型碳酸盐岩储层酸化解堵体系。室内以碳酸盐岩溶蚀率和渗透率为评价指标,分析了盐酸含量、碘磺酸乙酯含量、体系温度及初始渗透率对新型酸化解堵性能影响,并揭示其解堵机理。实验表明,盐酸及碘磺酸乙酯含量、体系温度及初始渗透率增加均有助于储层溶蚀率和渗透率提高,含7%盐酸的新型酸化解堵体系使地层溶蚀率及渗透率恢复率达96.1%和111.3%,远高于传统土酸体系的80.3%和76.1%。体系中含有的碘磺酸乙酯可延长溶蚀时间,提高解堵效率,展现出优异解堵和环保性能。Drilled cuttings and particles from drilling fluids generally cause severe blocking of the pores in carbonate reservoir rocks.A blocking removal acid fluid was developed to cope with this problem.The acid fluid is formulated with a new ethyl iodosulfonate which was synthesized based on the principles of organic chemistry and the principles of preparing acid fluids.In laboratory test,the effect of several factors,such as HCl content,ethyl iodosulfonate content,temperature of the acid fluid and initial permeability,on the blocking removal performance of the new acid fluid was analyzed using the dissolution rate of carbonate rocks and permeability as the evaluation indices.It was found that increases in the contents of HCl and ethyl iodosulfonate,the temperature of the acid fluid and the initial permeability all are beneficial to the increases of dissolution rate and the permeability of the carbonate rocks;Using the new acid fluid containing 7%HCl,the dissolution rate and percent recovery of permeability of the formation rocks were as high as 96.1%and 111.3%,respectively,far greater than these two indices for conventional clay acid,which are 80.3%and 76.1%,respectively.The existence of ethyl iodosulfonate in the acid fluid helps extend the time for the dissolution of the carbonate rocks,and enhance efficiency of blocking removal,exhibiting excellent blocking removal and environment protection performance.

关 键 词：碳酸盐岩储层 油田复合酸 酸化解堵 提高采收率 解堵机理 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]