| 摘要 |
A pressure absorbing tool is attached to a workover motor in a milling assembly. The tool includes an upper housing portion that is secured to a drilling string, and a lower mandrel portion that is secured to the workover motor and is moveable axially, but not rotationally with respect to the upper housing portion between an axially compressed position and an axially extended position. Longitudinal grooves are inscribed on the lower mandrel portion, and a plurality of guide members are associated with the upper housing and disposed within the grooves. The axially retracting design uses pressure acting across two pistons to retract as the motor stalls. The Belleville washers bias the tool to the extended position once the motor has returned to operating conditions.
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