Abstract: A tool is provided for preventing the rotation of a downhole tool or rotary pump stator, the tool comprising a tubular housing and a jaw which pivots radially outwardly from the tool upon tool rotation to engage the casing wall for arresting tool rotation and providing significant stabilization of a rotary pump. In doing so, the tool housing moves oppositely to rest against the casing opposite the jaw. The tool housing and the downhole tool are thereby restrained and stabilized by the casing wall. The tool's jaw is released and is stowed adjacent the housing by opposite tool rotation. Preferably the profile of the jaw allows it to stow closely against the housing for presenting minimal obstruction. More preferably, the jaw is formed independent of the housing and the bore supports differential pressure so that the tool can be installed above a rotary pump or as a part of an extended tailpiece.

Abstract: Apparatus is provided for stabilizing a PC pump suspended from production tubing. The stabilizing apparatus is connected to the pump and comprises a tubular body having a cylindrical wall, a longitudinal bore contiguous with the production tubing and three or more circumferentially-spaced linkages are disposed in longitudinal slots formed in the exterior of the tubular body. Each linkage comprises at least a passive and an active link pivotally connected end-to-end in series, the passive link being pivoted from the body. An annulus is formed within the cylindrical wall and contains a longitudinally movable annular piston pivotally connected to the active link. The annulus is connected to the bore so that the piston is pressurized dynamically with fluid from the bore. Fluid pressure drives the piston, actuating the active link, thereby causing the linkage to expand radially outwards, the radial force being proportional with the fluid pressure.

Abstract: Improvements in centrifugal pumps are disclosed which minimize flow recirculation effects induced by wear ring leakage flow. The improvements may be used individually or in combination and comprise deflector means attached to the impeller, diverter means attached to the casing or impeller or wear ring inducer means.