文章基本信息

标题：IMPROVING THE WELLBORE STABILITY WITH HIGHPERFORMANCE WATER-BASED DRILLING FLUIDS INBONGOR BASIN, CHAD
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作者：Zhang Rui ; Tang Yinan ; Zhou Yanjun 等
期刊名称：Fresenius Environmental Bulletin
印刷版ISSN：1018-4619
出版年度：2020
卷号：29
期号：9
页码：7481-7487
语种：English
出版社：PSP Publishing
摘要：The problem of borehole instability is a major problem that plagues the H block of the Bongor Basin in Chad. In the actual drilling process using the potassium formate (PFA) drilling fluid system, there are downhole complications such as diameter reduction, collapse, electronic logging block, and casing extraction. The performance cannot meet the drilling requirements. Based on the existing drilling fluid system, the optimal form ulation of drilling flu id system w ith SIAT, KPAM and PAC-LV as key treatment agents was optimized by laboratory experiments and the amount was adjusted. The experimental analysis shows that the shale inhibitor SIAT has better ability to inhibit shale hydration than HP AG, superior to KCOOH. The use of the shale en- capsulator KPAM instead of EMP, FA-367 can effectively prevent the flocculation and thickening of the drilling fluid, and the flocculation time is shorter. The flu id loss reducer PAC-LV w ith remarkable flu id loss reduction effect and good com patibility w ith other additives is preferred. A fter application of the updated drilling fluid, the average hole diameter expansion rate of the seven wells in this field was 5.85%, which was 4.29% lower than before. The drilling fluid density was reduced to 1.50 g/cm3, and the average drilling cycle was shortened by 3.09 d, which saved the drilling cost significantly.
关键词：Chad Basin;Drilling fluid system;Optimization evaluation;Borehole instability;Shale