羌塘盆地油气地质调查井钻探技术进展

Progress in Drilling Technology for Oil and Gas Geological Survey Wells in Qiangtang Basin

摘要:

羌塘盆地油气资源调查评价工作主要依托地质调查井完成，主要采用绳索取心钻进工艺完成钻井施工。西藏地质六队通过不断摸索总结，找到一套适用于羌塘盆地高海拔高寒低氧深厚沉积岩等严苛条件下的绳索取心钻进工艺配套方案。钻探设备从优化改装传统机械岩心钻机升级到定制研发新型电动顶驱直驱钻机；取心钻具从S系列过渡到Q系列，并将绳索取心主要口径增大到SQ（150mm），形成了HQ（96mm）、PQ（122mm）、SQ（150mm）三大口径共担重任的局面；钻井液从常规细分散低固相体系发展到全新无固相高抑制抗污染阳离子体系；钻井堵漏从常规惰性材料和普通水泥浆液堵漏优化到抗水侵早强型水泥浆液堵漏和原创堵漏小球堵漏。

Abstract:

The investigation and evaluation of oil and gas resources in the Qiangtang Basin mainly rely on geological survey wells, and the drilling construction is mainly carried out using rope coring drilling technology. Through continuous exploration and summary, Xizang Geological Team 6 has found a complete set of wireline coring drilling technology that is suitable for severe conditions such as high altitude, cold and low oxygen deep sedimentary rocks in the Qiangtang Basin. The drilling equipment has been upgraded from optimizing and retrofitting traditional mechanical core drilling rigs to customizing and developing new electric top drive direct drive drilling rigs; The coring drilling tool has transitioned from the S series to the Q series, and the main diameter of the rope coring tool has been increased to SQ (150mm), forming a situation where the three major diameters of HQ (96mm), PQ (122mm), and SQ (150mm) share the responsibility; The development of drilling fluid from conventional fine dispersed low solid phase system to a new solid free high inhibition anti pollution cationic system; Drilling plugging has been optimized from conventional inert materials and ordinary cement slurry plugging to anti water invasion early strength cement slurry plugging and original plugging ball plugging.