聚合醇钻井液体系在吐哈油田的应用

吐哈油田储层孔隙度和渗透率低，极易受到污染；而大段泥页岩地层，极易发生水化分散膨胀，坍塌掉块，卡钻、井满等复杂事故，对储层造成严重损害。经室内试验，优选出了适合吐哈油田地层特性的聚合醇钻井液配方。聚合醇钻井液体系具有良好的润滑性、抑制性和防塌性以及保护油气层的能力。经神北4、红台10等探井和米48C、雁6—14C套管开窗侧钻水平井以及陵6—3C套管开窗侧钻定向井应用表明．聚合醇水基钻井液流交性好、性能稳定，有效地解决了井壁失稳问题．大大地降低了井下复杂事故发生率，提高了机械钻速，井眼规则，有效地保护了储层；聚合醇钻井液处理剂配伍性好，现场转化、维护和处理简便。满足了吐哈油田探井、大斜度定向井、水平井及开窗侧钻小眼井等特殊工艺井钻井施工的要求。

Application of polyol drilling fluid system in Tuha oilfield

Polyol drilling fluid system has been optimized based on laboratory studying and tests to withstand the formation probilems in Tuha basin where reservoir porosity and permeability are low, and formation pollution, shale hydration dispersion, sloughing, pipe sticking and lost circulation often occur. Field using in exploration wells Shenbei 4 and Hongtai 10, casing side tracking hole horizontal wells Mi 48C and Yan 6-14C and casing side tracking hole directional well Ling 6-3C have shown that the system has such advantages as good lubricity, inhibition and sloughing prevention property, and good wellhole stabilization. Using polyol drilling fluid, complex accident rate during drilling has been reduced evidently, ROP has been increased and regular borehole has been gained. In addition, the system has good compatibility and easy for field maintenance and operating. It can satisfy the special requirements of exploratory wells, high-inclination directional wells, horizontal wells, window cutting side tracking slim hole drilling, etc. in Tuha.