砂岩储层黏土矿物溶解实验研究  

Experimental study on clay mineral dissolution in sandstone reservoir

作　　者：王春鹏 梅文博 谭章龙 张亚飞[2] 申文杰 张钟浩 邓拓[2] 王金杰 杨浩[3] 张浩[3] WANG Chunpeng;MEI Wenbo;TAN Zhanglong;ZHANG Yafei;SHEN Wenjie;ZHANG Zhonghao;DENG Tuo;WANG Jinjie;YANG Hao;ZHANG Hao(China United Coalbed Methane(Shanci)Co.,Ltd.,Taiyuan 030000,China;China United Coalbed Methane Co.,Ltd.,Beijing 100015,China;China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]中联煤层气(山西)有限责任公司,太原030000 [2]中联煤层气有限责任公司,北京100015 [3]中国地质大学(北京),北京100083

出　　处：《非常规油气》2023年第6期102-108,共7页Unconventional Oil & Gas

基　　金：中国石化固井与完井重点实验室开放基金项目“耐高温地聚合物水泥浆体系优选及形成机理研究”(20-GWJ-KF-11)。

摘　　要：为了搞清砂岩储层黏土矿物溶解情况,提出效果较好的解堵体系;针对不同酸液与储层黏土矿物发生反应易造成储层堵塞等问题,开展了盐酸、氢氟酸、氟硼酸和乙酸单独溶蚀矿物实验;研究了反应温度和酸液浓度的影响以及矿物解除效果评价;在此基础上,进行了混合酸液以及混合碱盐溶液对矿物溶蚀实验研究。结果表明:1)盐酸、氢氟酸、氟硼酸和乙酸的最佳单酸溶液的矿物溶蚀浓度分别为6%~8%,2%~4%,4%~6%和1%~5%,4种酸均起到了降低岩心强度的作用,盐酸的影响最大,乙酸影响最小(5%)。2)4种酸液对石英、长石和黏土等矿物溶蚀的影响顺序为氢氟酸>氟硼酸>盐酸>乙酸。3)氢氧化钠和氢氧化钾对矿物的溶蚀效果较差,硅酸钠和氯化铵对矿物溶蚀后,岩心强度得到提高。4)提出黏土矿物解除体系为(2%~4%)氢氟酸+(6%~8%)盐酸+(4%~6%)氟硼酸+(1%~5%)乙酸,系统的酸液浓度可在浓度范围内调节。以上成果认识,对解除储层黏土矿物时保护储层骨架有一定的指导意义。In order to clarify the dissolution of clay minerals in sandstone reservoirs and propose a plugging removal system with good effect.In view of the problems such as reservoir plugging caused by the reaction between different acids and clay minerals,separate experiments were carried out to dissolve minerals using hydrochloric acid,hydroflu-oric acid,fluoroboric acid and acetic acid were carried out.The influence of reaction temperature and acid concentra-tion and the evaluation of mineral dissolution effect were studied.On this basis,the experimental study on the disso-lution of minerals with mixed acid solution and alkali and salt solution was carried out.The results show that:1)The optimal mineral dissolution concentration range of single acid solution is 6%~8%,2%~4%,4%~6%and 1%~5%for hydrochloric acid,hydrofluoric acid,fluoroboric acid and acetic acid.The four acids all play a role in reducing the strength of the core,of which hydrochloric acid has the greatest effect and acetic acid has the least effect(5%).2)The sequence of effects of the four acids on the dissolution of quartz,feldspar and clay minerals is hydrofluoric acid>fluoroboric acid>hydrochloric acid>acetic acid.3)The dissolution effect of sodium hydroxide and potassium hydroxide on minerals is poor,while the core strength is improved after the dissolution of sodium silicate and ammonium chloride.4)It is proposed that the clay mineral removal system is(2%~4%)hydrofluoric acid+(6%~8%)hydrochloric acid+(4%~6%)fluoroboric acid+(1%~5%)acetic acid,and the acid concen-tration of the system can be adjusted in the concentration range.The above results have certain guiding significance to protect the reservoir skeleton when removing the clay minerals.

关 键 词：黏土矿物 堵塞 矿物溶蚀 酸 室内实验 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]