First Successful Mechanical Cutter Cut Tubing Under Compression Including Three Different Types of Control Lines

Recia Karina Melly, Surya Putra Sri Sutama
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Abstract

One of O&G operator in Indonesia is scheduled to have a re-entry and drilling campaign at their deepwater field. The re-entry program objectives were to cut 5-1/2", 17#, 13Cr-L80 tubing and POOH existing upper completion prior P&A operation. Due to the well condition the chosen cut depth was at high inclination and multiple control lines need to be severed. A cutter with new design machining arm shaped like tiger claw was chosen to perform the cut. This operation was an outstanding achievement and the first time for deepwater in the region. A conventional way of tubing cut is putting the tubing in tension to prevent cutting blades got pinched and increase the chance of successful cut. However, the challenge for tubing cutting at this well was not only to cut the multiple control lines but also tubing hanger was not preferred to be unlatched prior tubing cut. The mechanical cutter should be able to cut under compression and also reach control lines with total OD of 6.916". Mechanical cutter with new design tiger claw blade was chosen due to its ability to cut the tubing under compression and also the blade arms could expand increases the cutting range to 7.2" guaranteeing continuation cutting beyond tubular OD through the multiple control lines. As this will be the first time in Indonesia, a SIT was performed in two conditions, under compression and neutral, with results confirming the cutter was able to cut tubing and multiple control lines. The cutter was deployed using e-line with tractor conveyance due to high degree inclination and positioned 1m below the tubing coupling to ensure the control lines were still in tension as it was close to the cable clamp. The new machining arm technology produces a grinding effect to cut through the tubing and as it expanded reaching the control lines, the blades keep grinding the tubing body and scored the control lines. After 129mins effective cutting time and confirmed with the circulation from annulus to tubing, it was decided to stop and POOH the cutter. When the cutter at the surface, it was measured that the blade had expanded, and operation continued to unlatch tubing hanger and POOH upper completion. The tubing was cut with a clean and smooth surface with control lines sheared at cutting depth. With the newly designed cutting elements, enabling a safe and efficient cutting operation. This solution eliminates the risks of unlatching the TH and put tubing in tension, the cost of rig time and ensuring no interruption to the well program. Operational details, including job planning and lessons learned will be discussed in the paper
首次成功的机械切割器在压缩下切割油管,包括三种不同类型的控制线
印度尼西亚的一家油气运营商计划在其深水油田进行重新进入和钻井活动。再入井计划的目标是在弃井作业之前切割现有上部完井的5-1/2”、17#、13Cr-L80油管和POOH。由于井况,选择的切割深度处于大斜度,需要切断多条控制线。采用新设计的虎爪形加工臂刀具进行切削。此次作业取得了杰出的成就,也是该地区深水作业的首次。传统的油管切割方法是将油管拉紧,以防止切割刀片夹紧,增加成功切割的机会。然而,这口井的油管切割面临的挑战不仅是要切割多条控制线,而且油管悬挂器在切割油管之前不希望被解开。机械切割机应能在压缩下切割,并能到达总外径为6.916”的控制线。采用全新设计的虎爪刀片的机械刀具,能够在压缩条件下切割油管,并且刀片臂可以扩展,将切割范围增加到7.2英寸,保证通过多条控制线在油管外径之外继续切割。由于这是在印度尼西亚的第一次,因此在压缩和中性两种情况下进行了SIT作业,结果证实了切削齿能够切割油管和多条控制线。由于斜度较大,切削齿采用带牵引器的e-line下入,定位在油管接头下方1m处,以确保靠近电缆卡箍的控制线仍处于张力状态。新的加工臂技术产生磨削效果,切割油管,当它扩展到控制线时,刀片继续磨削油管体并划破控制线。经过129分钟的有效切削时间,并与环空到油管的循环确认后,决定停止切削齿并将切削齿排出体外。当切削齿到达地面时,测量到刀片已经膨胀,然后继续作业,解开油管悬挂器和POOH上部完井。油管切割时表面干净光滑,控制线在切割深度处剪切。采用全新设计的切割元件,实现安全高效的切割操作。该解决方案消除了打开TH和拉紧油管的风险,减少了钻机时间成本,并确保了作业不中断。操作细节,包括工作计划和经验教训将在文件中讨论
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