钻井液与完井液2023，Vol.40Issue(6)：725-732,8.DOI:10.12358/j.issn.1001-5620.2023.06.005
冀东NP280 Es31井壁稳定钻井液技术
Drilling Fluid Technology for Stabilizing the Borehole Penetrating the Shasanyi Sub-member in Block NP-280 in Jidong Oilfield
摘要
Abstract
Borehole wall collapse has been encountered when drilling the Shasanyi sub-member in many wells in the NP-280 block in Jidong Oilfield.Study has shown that the shales in the block are easy to hydrate when in contact with water.Microfractures with medium and high angles are developed in the thief zones.These microfractures,with original widths of 0.1 μm-100 μm,become widened under pressure and hence further become fractures through which drilling fluids are lost.This in turn induces large-scale sloughing of the borehole walls and borehole collapse has thus occurred.In this paper,the studies on the mechanisms of borehole wall stabilization in the broken formations in the NP-280 block and the methods of borehole wall instability evaluation are described.Using the high temperature inhibitive drilling fluid,which was used to drill the third interval of the wells,a new inhibitive drilling fluid with high plugging capacity is developed thorough laboratory optimization.This drilling fluid is suitable for drilling formations with induced microfractures.Field application shows that it can be used to effectively prevent the borehole wall collapse problems encountered in drilling the Shasanyi sub-member,and this technology is worth applying in future drilling operation in this area.关键词
南堡280区块/Es31/钻井液/封堵/井壁稳定Key words
Nanpu Block 280/Shasanyi sub-member/Drilling fluid/Plugging/Borehole wall stabilization分类
能源科技引用本文复制引用
吴晓红,陈金霞,王现博,阚艳娜,丁乙,罗平亚..冀东NP280 Es31井壁稳定钻井液技术[J].钻井液与完井液,2023,40(6):725-732,8.基金项目
国家自然基金-面上项目"深井、超深井水基钻井液失水造壁性与流变性调控机理研究"(52274008) （52274008）
国家重点研发计划课题"井筒稳定性闭环响应机制与智能调控方法"(2019YFA0708303). （2019YFA0708303）
