Application of strong plugging oil based drilling fluid in Shunbei Block
强封堵油基钻井液在顺北区块应用

摘要

新疆顺北区块下部地层奥陶系中下统一间房、鹰山组地质岩性为灰色、黄灰色泥晶灰岩。奥陶系碳酸盐岩储层溶蚀孔洞、裂缝发育，常出现井榻、井漏、井涌等井下复杂情况。塌漏同层，密度窗口较窄，同时井底温度较高，聚磺钾盐水基体系泥浆无法满足井下要求。采取预防为主，堵漏为辅的堵漏措施，刚性柔性都漏材料相结合，解决了油基泥浆堵漏难题。为在该区块施工出现井漏提供借鉴意义。

Abstract

The geological lithology of the lower strata of the Shunbei Block, Xinjiang, is gray and yellowish gray micrite limestone. The Ordovician carbonate reservoir is characterized by the development of corrosion holes and fractures, often resulting in downhole complex situations such as well bed, lost circulation, and kick. Collapse and leakage in the same layer, narrow density window, and high bottom hole temperature make the polysulfonated potassium salt based mud unable to meet downhole requirements. The problem of oil based mud plugging has been solved by adopting prevention first, supplemented by plugging measures, and combining rigid and flexible plugging materials. It provides reference significance for the occurrence of lost circulation during construction in this block.