钻探工程2024，Vol.51Issue(5)：154-162,9.DOI:10.12143/j.ztgc.2024.05.019
广西苗儿山大厚度水敏性地层冲洗液技术研究及应用
Research and application of drilling fluid technology for thick water-sensitive formations in the Miaoershan area of Guangxi
摘要
Abstract
The potential for uranium exploration in the Miaoershan area of Guangxi is enormous,but part of the formations are complex,with large thickness of water-sensitive and broken formations.During drilling construction,difficulties such as hole wall collapse and excessively large bore diameter occur frequently,leading to frequent accidents in the hole,which seriously affect the construction progress.Therefore,mineral composition and microscopic characteristics of water sensitive cores in the area were analyzed.The analysis results show that there are a large amount of clay minerals such as montmorillonite,kaolinite,hydromica,etc.in the water-sensitive formations,and the microcracks are developed with serious hydration expansion.To solve above problems,new materials with film forming and wall protecting functions were optimized through indoor evaluation experiments,and a drilling fluid system with good wall protection performance was further developed,which consists of 5%film-forming agent A,3%film-forming agent B,1.5%modified asphalt,1%plugging agent while drilling,1%sealing agent,0.6%viscosifier,0.2%coating agent.The API filtration loss of this drilling fluid is 5～8mL,and the relative expansion reduction rate reaches over 87%.This drilling fluid can effectively inhibit hydration expansion of the water-sensitive formations,and the wall protection effect is significant.This technology has been successfully applied in three boreholes in the Miaoershan area,smoothly drilling through water-sensitive formations without any problems such as core dispersion or hole wall collapse.Good application results have been achieved,and a film forming and wall protection drilling fluid technology has been preliminarily formed for water-sensitive formations in this area.关键词
水敏性地层/成膜护壁冲洗液/孔壁坍塌/钻孔超径/铀矿勘探Key words
water-sensitive formation/film-forming wall protection drilling fluid/hole wall collapse/excessively large bore diameter/uranium exploration分类
天文与地球科学引用本文复制引用
刘俊辉,李晓东..广西苗儿山大厚度水敏性地层冲洗液技术研究及应用[J].钻探工程,2024,51(5):154-162,9.基金项目
中国核工业地质局铀矿地质项目"苗儿山—越城岭地区铀矿资源调查评价与勘查"(编号:2022-22) （编号:2022-22）
