气动夯管锤和滑轮组在定向钻回拖中的应用

Application of pneumatic pipe-rammer and pulley block in directional drilling towback

针对管道回拖过程中容易出现卡钻的问题,提出3种解决方法:夯管锤振击解卡、滑轮组解卡以及夯管锤和滑轮组配合解卡。以林头村抚河穿越工程为例,在夯管锤振击解卡和滑轮组解卡均失败的情况下,采用夯管锤和滑轮组配合解卡的现场操作工艺。结果表明:经过4d解卡施工,管道完全从孔洞中拖回地面,管道和防腐层完好无损,仅焊口处的防腐带略有剥裂。由于滑轮组行程存在一定弊端以及缺乏钢丝绳防护措施,夯管锤和滑轮组配合解卡的方法尚需进一步改进。

Three solutions are proposed against the sticking that may happen during pipeline towback, that is, releasing via jarring with a pipe-rammer, releasing with a pulley block, and releasing with both pipe hammer and pulley block. In the Fuhe River crossover project at Lintou Village, for example, the pipe hammer and pulley block were combined to release the stuck pipe when both first two solutions were failed. The result indicates that after releasing operation for 4 days, the pipeline was completely pulled back to the surface from the hole, both the pipeline and anti-corrosion coating were intact, and only the anti-corrosion belt at the weld junction showed slight spalling. The combined pipe hammer and pulley block method still needs to be improved, because there are some shortcomings with the pulley block stroke and no protections for the wire rope. （5 Figures, 4 References）