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有机盐钻井液体系由水溶性加重剂Weigh2和Weigh3、降滤失剂Redu1和Redu2、无荧光白沥青NFA-25、强包被抑制剂IND10、提切剂Visco1和Visco2组成。有机盐钻井液具有流变性好、抑制性强、造壁性好、保护油气层效果好、对钻具无腐蚀,对环境无污染等特点。介绍了有机盐钻井液在DH1-8-6井的现场应用情况。应用结果表明,该井二开段井眼平均井径扩大率为5.4％;该井井底温度为134℃,在深井段取心、钻进和完井的施工中,钻井完井液性能稳定,滤失量稳中有降,取心、完井作业,3次完井电测以及下套管固井均非常顺利。该井使用FS2565钻头从井深1892 m钻至井深5120 m,进尺3228 m,钻头提出后完好无损,证明该体系能够充分清洗、冷却和保护钻头,延长钻头寿命;该井有机盐钻井液现场用浆经中国石油天然气集团公司环境监测总站检测,结果无毒。
Organic salt drilling fluid system consists of water-soluble Weigh2 and Weigh3 weight loss reducer Redu1 and Redu2, fluorescent white pitch NFA-25, strong coating inhibitor IND10, cutting agent Visco1 and Visco2 composition. Organic salt drilling fluid has the advantages of good rheology, strong inhibition, good wall making, effective protection of oil and gas formation, no corrosion on the drilling tools and no pollution to the environment. The application situation of organic salt drilling fluid in DH1-8-6 well was introduced. The application results show that the average well diameter expansion rate of the second section of the well is 5.4%, and the bottomhole temperature of the well is 134 ° C. During the construction of coring, drilling and completion in the deep section, the drilling and completion fluid performance is stable , The amount of fluid loss is steady down, coring, completion, electrical completion of the three well completion and well casing cementing are very smooth. The well drilled, drilled and protected the bit with FS2565 bit from 1892 m to well depth of 5120 m and 3228 m into the well, which proves that the system can prolong the life of the bit. The drilling fluid of organic salt drilling fluid The China National Petroleum Corporation Environmental Monitoring Station test, the results non-toxic.