英科1井深井高压差小间隙长套铣工艺实例

英科1井是重点探井,钻至6260m时严重气侵,在处理钻井液时发生压差卡钻,φ213mm钻头位置5080m,出φ244.5mm套管鞋280m。经泡解卡剂、降密度减压差,不仅没有解卡,反而导致盐水更大程度地污染钻井液,最后堵水眼失去循环。后倒扣压井成功,用φ206mm套铣筒两次套铣倒扣,鱼长193.29m。第三次决定长套铣,争取一次解卡。在间隙小、压差大、井段长的情况下,由于落实了各项措施,经32h顺利套铣192.48m,后下钻对扣,上提解卡。

AN EXAMPLE OF WASHOVER TECHNOLOGY IN LARGE INTERVAL WITH HIGH DIFFERENTIAL PRESSURE AND NARROW SIZE DIFFERENCE IN YX-1 WELL

YX-1 well, an important exploratory well in Tarim Basin, encountered a serious gas cut at 6260 m and a differential sticking with φ213 mm bit at 5080 m when a mud treatment was contacted. The φ244 mm technical casing shoe was at 4820 m. The spotting a soak solution and reducing mud weight were failed as remedial measures and led to a more severe case-mud deeply contaminated and plug of bit nozzles. Two washover operations were applied with φ206 mm washover tool and two sets of fish of total 193.29 m long were twisted off and recovered. The third washover operation for the total remained fish of 192.48 m was successfully done after 32 hours manipulation.