带压切割气井双封分压管柱工艺技术

Cutting Under Pressure Technology for the Tubing String with Dual Packer in Gas Well

复杂多个大直径工具管柱、腐蚀管柱和带喷砂器的管柱带压起钻工艺尚无有效方法,为此,研发了带压切割气井双封分压管柱工艺技术。该工艺技术采用专门的带压切割装置,利用切割刀具在装置内逐段切割,带压起出切割掉的油管,下带压密封捞矛打捞切割掉的油管鱼头,逐级起出复杂管柱。现场试验结果表明,气井带压切割工艺可以实现73.0 mm N80油管双封分压管柱的带压切割;对于腐蚀穿孔和双封分压以上复杂管柱可以采取装置内分段切割、密封打捞及分级起出的技术方案。

There is still no effective method of tripping out complex multiple large diameter tool string, corro?sion string and string with sandblast under pressure, to address the issue, a technology of cutting dual packer iso?lation string in gas well has been developed?A special device capable of cutting string under pressure is used to cut the string by cutter?After tripping out the cut tubing string section, run fishing spear for snubbing operation to fish the tubing string in well, thus, tripping out the complex string piece by piece?Field tests show that the cutting un?der pressure technology for gas well is fully capable of cutting the ?73?0 mm N80 tubing string with dual packer un?der pressure?For corrosion perforation and the complex string upper dual packer, cutting into piece, fishing with sealing and tripping out piece by piece could be a solution.