北部湾盆地全油基钻井液技术研究与应用

Development and Application of Full Oil-based Drilling Fluids in Beibu Gulf Basin

南海西部北部湾海域地质构造复杂,一直以来是钻完井事故的多发区。面对边际油田开发难度的不断增加,针对该海域涠洲组易垮塌、断层多、易井漏、易发生卡钻和储保难度大等特征,通过室内配伍实验,分析各材料加量比例,确定配方,形成了一套新型全油基钻井液体系。通过现场应用表明,与常规油基钻井液对比,全油基钻井液具有更强的封堵能力和抑制性,润滑性能好,抗污染能力强,井眼清洁好,储层保护效果好,有效提高机械钻速,解决了传统强封堵油基钻井液体系出现的诸多问题,达到了综合提速的效果。

The geological structure of the beibu gulf basin oilfields in west Nanhai is complex.Down-hole incidents are frequent in well drilling and completion.In order to cope with the increasing difficulties in the marginal oil field drilling,such as wellbore collapse,multiple faults,formation leak,drill pipe sticking,difficult reserve protection, etc.in the Weizhou formation in this area,a novel full oil-based drilling fluid formula was developed through laboratory compatibility experiments based on the ratio of each drilling fluid component.Comparison of full oil-based drilling fluids with conventional oil-based drilling fluids indicate that the full oil-based drilling fluids have stronger sealing and plugging,inhibition,good lubrication performance,strong anti-pollution ability,good wellbore cleaning and good reservoir protection.It can also effectively increase ROP and solve many problems with the conventional oilbased drilling fluid,achieving a comprehensive drilling efficiency.