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DH1-H3井是位于塔里木盆地塔北隆起东河塘断裂构造带东河1背斜的一口超深阶梯水平井,完钻井深为6326 m。该井深、井眼大且长裸眼,油层压力系数低、存在高压差,钻井过程中的潜在事故、复杂隐患多,该区的1口水平井因在二开大井眼无法解决“流变性与压耗”的矛盾,被迫提前中途完钻;另1口水平井因卡钻而侧钻。该井通过优选正电胶-聚合物-聚磺体系,优化配方及维护处理方案,保证了该井的顺利完成并节约钻井周期80多天。提出,采用强封堵、强润滑,结合“无故障及间歇”钻井的思路,可解决高压差、枯竭产层的压差卡钻问题;合理复配使用正电胶与高分子量聚合物,是解决抑制与分散、循环压耗与岩屑携带的关键。
Well DH1-H3 is an ultra-deep-stepped horizontal well located at Donghe 1 anticline, East Beitang Uplift, Tarim Basin, with a drilling depth of 6326 m. The well depth, borehole large and long naked eye, the reservoir pressure coefficient is low, there is a high pressure differential, the potential accident during drilling, complex hidden trouble, the area of 1 horizontal well can not be solved because of the open 2 big wellbore “rheology and pressure Consumption ”contradiction, forced to finish drilling halfway; the other one horizontal well due to stuck and sidetrack. The well ensures that the well is completed successfully and the drilling cycle is saved for more than 80 days by optimizing the positive rubber-polymer-polysulfone system, optimizing the formulation and maintaining the treatment plan. It is put forward that adopting strong sealing and strong lubrication combined with the idea of “no fault and intermittent” drilling can solve the problem of differential pressure sticking in high pressure difference and depleted pay zone; reasonably compound with positive glue and high molecular weight polymer , Is to solve the restraint and dispersion, the key to the cycle of pressure loss and debris carry.