曲斜7井气举解卡工艺

TECHNOLOGY OF STUCK PIPE FREEING USING GAS-LIFT METHOD IN QX-7 WELL

李渝江 吴德林 李玉华 牟德刚 王少英

Li Yujiang Wu Delin Li Yuhua Mu Degang Wang Shaoying

滇黔桂石油勘探局临盘钻探公司

曲斜7井是在老井φ311mm技术套管以下231m(井深1720m)处裸眼中侧钻的一口双靶深定向探井,设计井深3389m,最大井斜角53°,水平位移952m。在井下严重垮塌、井径大、有S形井段的情况下,钻至2598m接单根时发生压差粘附卡钻。经2次泡水基解卡剂和打携砂液清除岩屑床、降低钻井液密度处理均无效,后用气举降压解于一次成功。文中介绍了气举降压解卡的原理和现场施工工艺。该方法的优点是简便、快捷、费用低、效果好,且不改变原有钻井液的性能。

Exploratory QX-7 well was a sidetrack two-targets directional well with designed bottom depth of 3389 m, maximum deviation of 53°and horizontal displacement of 952 m. A differential pressure sticking was encountered at 2598 m under a circumstances of severe sloughing, and with enlarged hole gauge and dog-leg intervals during a pipe connection. After two spotting operations with water based spotting fluid and bore hole washing with a drilling fluid with lowered specific gravity were failed to eliminate the problem. A technology of gas-lift was applied successfully to free the stuck. The mechanism and engineering steps of freeing technology by gas-lifting and pressure lowering were described in the paper. The advantages of this technology are effective, low cost, simple and fast without influence to change the drilling fluid properties.

10.3969/j.issn.1000-7393.1997.01.005