A holistic approach was employed to develop a technique for conveying severing tools on wireline tractor. The objective is to establish a procedure to preserve the integrity of the tractor and related components of the toolstring.
Wireline tractors are sometimes required to convey pipe recovery services when the drillpipe becomes stuck and circulation is lost. In this case, the primary objective is to free the pipe in the lateral right above the stuck point. Pipe recovery services typically use a freepoint finder, detonating cord, and pipe cutter or colliding tool. This last option employs a high explosive load triggered in a specific manner to cause precise collision of the shock waves. Unfortunately, the explosion commonly damages the tractor used for conveyance.
A full experimental characterization of the downhole explosion was conducted to record all critical parameters that could physically damage the tractor. A dedicated special acquisition system was then used to measure experimentally the effect of a colliding tool conveyed on a tractor including pressure, shock, and strains.
In-depth analysis of the results was used to determine optimized operational guidelines and practices to achieve the objective of reliably conveying severing tools while preserving the integrity of the tractor and related logging tools. The technique relies on a cost-effective solution.
This method has been deployed to the field for successful application in the Middle East where it saved significant operational time and maximized the recovered pipe length without any damage to the tractor.
With this enhanced method, wireline tractors can convey pipe recovery tools with acceptable risk of damage to the tractor, which reduces operation cost. Overall, it significantly increases the confidence in using this conveyance option for pipe recovery services and minimizes potential downtime.
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