pH值对高密度钻井液流变性能的影响  

Influence of pH value on rheological performance of high-density drilling fluid

作　　者：郭靖[1] 李天太[1] 张喜凤[1] 郭必虎 张斌[3] 梁红军[3] 

机构地区：[1]西安石油大学石油工程学院,陕西西安710065 [2]长庆石油勘探局巡视组,陕西西安710065 [3]塔里木油田公司勘探事业部,新疆库尔勒841000

出　　处：《断块油气田》2008年第1期95-97,共3页Fault-Block Oil & Gas Field

基　　金：国家自然科学基金项目:复杂条件下钻井技术基础研究(50234030)资助

摘　　要：随着油气勘探地下条件的日趋复杂,在钻井过程中不得不使用密度在2.25g·cm-3以上的高密度钻井液。通过大量实验,研究了在添加PAC-HV(高黏度聚阴离子纤维素衍生物)前后,pH值对高密度钻井液流变性能的影响规律。实验结果表明:当加碱量为0.9%时,聚合物钻井液的pH值在8.5～9.5时,钻井液的表观黏度、塑性黏度和动切力最小,钻井液的流变性最佳;由于PAC-HV的包被作用,钻井液黏度的大小受pH值影响程度显著。该研究成果将为高密度钻井液在各个油田现场的推广使用,提供基础理论依据。Because of the complex downhole geological conditions,the high-density drilling fluids（high than 2.25g/cm^3） have to be used in some oilfields. Based on lots of tests, the influence of pH value on rheological performance of high-density drilling fluid have been researched at the different conditions of adding PAC-HV and without PAC-HV, The experimental results show that when alkali quantity reaches 0.9% and pH value reaches 8.5-9.5, the values of AV, PV and VP become minimal, and the performance of drilling fluids becomes best. Because of the package action of PAC-HV, the viscosity of drilling fluids is influenced. The study results offer a theoretical foundation for the high--density drilling fluids widely used to other oilfields.

关 键 词：PH值 PAC-HV 高密度 钻井液 流变参数 实验研究 

分 类 号：TE254[石油与天然气工程—油气井工程]