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| 大口径管道定向钻穿越复杂地层的设计与施工 | |
| 引用本文： | 陈周,冉永红,尤伟星,张浩.大口径管道定向钻穿越复杂地层的设计与施工[J].油气储运,2012,31(1):33-35,83,84. |
| 作者姓名： | 陈周 冉永红 尤伟星 张浩 |
| 作者单位： | 1. 中国石油天然气管道工程有限公司穿跨越室,河北廊坊,065000 2. 中国石油天然气管道局国内事业部,河北廊坊,065000 3. 北京城建建设工程有限公司,北京,100000 |
| 摘 要： | 西气东输二线举水定向钻穿越工程中,采用原定向钻单穿设计方案施工时,管道拖至覆盖层与岩层交界面处时受阻致使回拖失败。按照顺气流方向向右平移10m后重新进行穿越,实施对穿方案,并在原设计方案的出土端采用开挖、夯套管及注浆加固处理松软覆盖层的方法,最终成功穿越。分析首次穿越失败原因:未加固覆盖层、穿越管径过大以及扩孔器较重等因素共同作用导致扩孔时出土端覆盖层下沉,覆盖层与岩石交界面处形成台阶,使管道回拖卡阻。总结施工经验,在大管径定向钻穿越软硬交错复杂地层的设计与施工中,务必加固上部覆盖层,且扩孔、修孔、洗孔、回拖过程应连续进行,在特殊情况下,停止回拖时间不宜超过4h。 |
| 关 键 词： | 油气管道 定向钻 软硬交错地层 扩孔 卡阻 对穿 |
Design and construction of directional drilling crossing project for large-diameter pipeline in complex stratums |
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| Chen Zhou,Ran Yonghong,You Weixing,Zhang Hao.Design and construction of directional drilling crossing project for large-diameter pipeline in complex stratums[J].Oil & Gas Storage and Transportation,2012,31(1):33-35,83,84. | |
| Authors: | Chen Zhou Ran Yonghong You Weixing Zhang Hao |
| Institution: | 1.China Petroleum Pipeline Engineering Corporation2.China Petroleum Pipeline Bureau Domestic Division3.Beijing Urban Construction Group Co.Ltd |
| Abstract: | As one of the construction items of the 2nd West-to-East Gas Pipeline,Jushui crossing project with directional drilling way was carried out,with the specifi ed design pressure 10 MPa and pipe diameter 1219 mm.The one-crossing method designed in original crossing scheme was failed when the pipe was towed back at the interface of soil layer and rock layer.A modifi ed scheme was presented by re-drilling at a parallel location 10 m right away from previous point along air flow direction,applying opposite-direction drilling.Also,by excavating at the otherend,using tampering casing and injecting grouting to consolidate the loose soil layer,the drilling succeeded fi nally.Analyzing the failure reasons,the unsuccessful backtow was from the step-shaped curve at the interface of soil layer and rock layer,which resulted from non-consolidated soil layer,too large drilling diameter and the heavy bore-expander.For large diameter drilling crossing the soft-hard alternating layer,the soil layer had to be consolidated,the bore expansion,repair,clean and towback should proceed continuously.In special cases,the shut-down time for towback should not more than 4 hr. |
| Keywords: | oil and gas pipeline directional drilling soft-hard alternating layer bore expansion Blockage opposite-direction drilling |
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