JPT Technology Applications: Cut-and-Pull Spear

Copyright 2014, Society of Petroleum Engineers. Reprinted from the Journal of Petroleum Technology with permission.

With many aging wells approaching the decommissioning stage, operators are looking for effective options to plug and abandon (P&A) their wells, particularly in offshore environments. Baker Hughes has introduced the Harpoon cut-and-pull spear, designed for P&A and slot recovery operations (Fig. 5). The spear can be set and reset several times through simple mechanical manipulation, allowing multiple cut-and-pull attempts in a single trip for reduced nonproductive time. This is especially advantageous in situations where cement bond and scale buildup are unknown, improving the probability of success. The Harpoon is run in with a cutting assembly and does not require a stop ring, allowing the robust spear to engage the casing directly above the cut, ensuring maximum force is distributed at the cut point. Specially designed slips distribute loads evenly across the entire casing diameter to prevent casing deformation, and the tool applies tension during cutting for improved cutting performance. A built-in filter helps control debris for increased reliability. The spear’s design also supports loads in both directions so it can accommodate the use of fishing jars. For added safety, the spear features a packoff device to control the circulation of annular fluids from the well or in the event that a pressurized zone is exposed during the cutting operation.

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