Reducing Fluid Pound Effects With A Downhole Cushioning Device

The downhole cushioning device can reduce fluid pound effects on sucker rod strings. The tool studied in this paper is compact and simple. It is placed in the rod string above the pump to absorb shock waves. This should help prolong equipment life and reduce operating expenses. The cushioning device uses a piston and sleeve that fill with well fluid. Fluid enters the chamber creating a buffer to absorb and dampen shocks. Field data available at present indicate the device to be effective. Case histories show a reduction in rod failures after installation in problem wells.