The Technology of Long Cable Snubbing Fishing through Coiled Tubing in Horizontal Shale Gas Wells
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摘要: 为解决页岩气水平井泵送桥塞射孔联作时长电缆落井不易打捞的问题，研究了连续油管带压打捞长电缆技术。采用CCL磁性定位器探测鱼顶位置，然后下入"低速螺杆+外钩"的井下工具组合打捞落鱼，利用低速螺杆转动外钩捕获电缆，落鱼起至井口后利用电缆防喷器夹持电缆，打开井口防喷管，分段起出电缆。涪陵地区某井利用该技术成功打捞出了81.00 m长的电缆及通井工具串，取得了良好的现场应用效果。连续油管带压打捞长电缆技术解决了电缆在水平井井下位置不易精准定位、连续油管不能旋转和长电缆无法完全起至防喷管内等难点，为页岩气水平井打捞长电缆提供了一种不污染地层、安全可靠和灵活高效的方法。Abstract: In order to solve the problem of fishing the long cable lost in shale gas horizontal wells,a method of coiled tubing snubbing fishing was developed.In this method,the first step is to use the CCL to detect the depth of the fish top.Later,the RIH-downhole tool combination of low-speed screw motor works with the external grapple to recover the fish.The low speed screw motor rotates to drive the external grapple to catch the cable.After pulling out of the hole (POOH) and transporting the fish to the wellhead,a cable blowout preventer is used to seal the cable.Then the process is to open the wellhead preventer to pull the cable out of the hole in stages.This method resolves many difficulties,including the downhole precise positioning of cable,coiled tubing rotation,and long cable pulled up into the lubricator.This technology once was used to recover 81.00 m long cable+drifting string successfully in a well of the Fuling Area,and good results were attained by the field application. The success of long cable snubbing fishing through coiled tubing has provided a safe,reliable,flexible and efficient method for fishing of long cable in shale gas horizontal wells.
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Keywords:
- shale gas /
- horizontal well /
- operation under pressure /
- fishing /
- cable /
- coiled tubing
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