LXC-005井胶质复合堵漏材料水泥浆堵漏技术

LXC-005井在钻井、固井过程中陆续发生井漏,主要漏层为处于断裂带的煤层和漏失压力很低的砂层,先后用复合堵漏材料配成的复合堵漏钻井液和水泥堵漏11次无效。针对砂层、煤层裂缝的严重漏失情况采用了混合法堵漏技术,先用复合堵漏钻井液堵漏架桥,然后应用复合堵漏钻井液与水泥混配而成的水泥浆即胶质复合堵漏材料水泥浆堵漏。该井应用胶质复合堵漏材料水泥浆堵漏技术堵漏2次,取得了堵漏作业成功,为下套管、固井提供了一个稳定的井眼。下套管固井过程中未发生任何复杂情况,固井质量全优。实践证明,胶质复合堵漏材料(大颗粒)水泥浆适合于孔隙大的砂层和裂缝性煤层的堵漏作业。

Plugging Technology Using Colloid Composite Cement Slurry in Well LXC-005

Lost circulations were continually encountered during drilling and cementing operations of well LXC-005, and the main lost zones are coal beds in the fracture belts and sand zones with extremely low leaking pressure. Eleven times of plugging operations were conducted using drilling fluid made from composite plugging materials and cement, but without any effect. A hybrid plugging technology is adopted, i.e., use the composite plugging drilling fluid for bridging firstly, and then plug with the colloid composite cement slurry made from composite plugging drilling fluid and cement. Two times of plugging operations were conducted using the colloid composite cement slurry, and the lost circulation zones were finally sealed off. A stable hole was achieved for running casing and cementing, and without any trouble encountered during casing and cementing. It has been proved that the colloid composite cement slurry is suitable for plugging the sandstone of large pores and fractured coal bed.