浅层气区地质岩心钻探技术综合研究与应用

Comprehensive Study and Application of Geological Core Drilling Technology in Shallow Gas Area

核电发展需要稳定的铀资源供应,在我国北方油气盆地开展砂岩型铀矿战略选区和调查评价,需要对主要异常和重点地区进行取心钻探工程验证。但钻进地层极松散破碎,取心率低;浅层气发育,井控要求高;大直径扩孔,井斜和携岩困难;极寒冬季施工及环保要求高。通过研究和探索,形成了一套浅层气区极松散破碎地层的绿色综合钻探技术体系及工艺方法,包括单管锥阀取心、环保高粘低失水泥浆、远程井控、钻铤及导向钻具分级扩孔等,为北方砂岩型铀矿找矿突破和资源能源安全保障提供技术支撑,具有示范与推广作用。

The development of nuclear power requires a stable supply of uranium resources. For the strategic selection and investigation ＆ evaluation of sandstone-type uranium deposits in oil and gas basins in northern China, the main anomalies and key areas need to be verified by coring drilling. In view of the poor geological conditions of ex treme loose and broken strata with low core recovery, shallow gas development, high well control request, large diameter hole reaming with difficult well inclination control and difficult rock carrying, construction in extremely cold winter and high environmental protection request, a set of green integrated drilling techniques and methods is successfully explored for drilling in extremely loose fractured formation in shallow gas area such as single pipe cone valve coring, environment friendly high viscosity and low cement loss slurry, remote well control, graded reaming with drill collar and guiding drilling tool, which provides technical support for prospecting breakthrough of sand stone-type uranium deposit in northern China and energy supply security with extension demonstration.