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| Number | Title | Issue Date |
| 8128383 | Top seal assembly A downhole sucker rod pump including a brush disposed between the downhole pump barrel and the well tubing to provide an effective seal which is not damaged during the insertion and/or withdrawal of the pump. The bush has a sufficient density and stiffness, such tha... | 03/06/2012 |
| 7604464 | Mechanically actuated gas separator for downhole pump A reciprocating downhole pump has a gas separator located at its bottom end. The separator forms a chamber that is expanded and contracted when the pump is reciprocated. Expansion and contraction of the chamber occurs by either the plunger reciprocating in the chamb... | 10/20/2009 |
| 6986651 | Pump priming apparatus A pump priming apparatus including a housing through which fluid object material may be urged to flow, the housing including an intake portion and a pumping portion downstream from the intake portion. The apparatus further includes a piston assembly carried for reci... | 01/17/2006 |
| 6755628 | Valve body for a traveling barrel pump The invention is a component of a subsurface traveling barrel bottom anchor pump comprising a traveling valve assembly which includes: a cylindrical valve body having a lower section, the lower section having a central bore therethrough and external threads which in... | 06/29/2004 |
| 6352107 | Wear resistant well pump rod and method for making same An elongated pump rod or sinkerbar for use in a pump rod string for a downhole reciprocating well pump is provided with an elongated sleeve of high density or ultra high density polyethylene over a major portion of the length of the sinkerbar to minimize ... | 03/05/2002 |
| 5697768 | Downhole swivel A method and apparatus is disclosed which reduces or removes axial loads on the drive string of a rotary downhole pump, i.e. tensile loads due to the hydrostatic load of the pumped liquid on the pump rotor, and/or at least part of the weight of the drive ... | 12/16/1997 |
| 5667369 | Volumetric pump driven by a continuous tube This invention relates to a system for pumping an effluent that is produced by a geological formation, in which a rotary pump (3) is installed and driven in rotation by a continuous tube (12) that rises up to the surface. The tube makes it possible to inj... | 09/16/1997 |
| 5654504 | Downhole pump monitoring system The present invention relates to a downhole hydraulic pump monitoring system and more specifically relates to a system which detects and/or anticipates pump malfunctions by processing readings taken by a pressure transmitter on the operating pressure and ... | 08/05/1997 |
| 5193985 | Pump control system for a downhole motor-pump assembly and method of using same A new and improved control system for monitoring and controlling the operation of a downhole linear d.c. motor-pump assembly and a method of using it for producing a sufficient reciprocating pumping action to lift well fluid through the producing tubing o... | 03/16/1993 |
| 5131466 | Self actuated intake valve assembly for inlet subsurface reciprocating pumps The present invention is drawn to an inlet valve assembly for a subsurface sucker rod operated reciprocating piston pump and, more particularly an inlet valve assembly which is locked in its closed position when the pump is in its unanchored, non-pumping ... | 07/21/1992 |
| 5062480 | Self actuated intake valve assembly for insert subsurface reciprocating pumps The present invention is drawn to an inlet valve assembly for a subsurface sucker rod operated reciprocating piston pump and, more particularly an inlet valve assembly which is locked in its closed position when the pump is in its unanchored, non-pumping ... | 11/05/1991 |
| 5048604 | Sucker rod actuated intake valve assembly for insert subsurface reciprocating pumps The invention is drawn to an improved inlet valve assembly for use in subsurface sucker rod operated reciprocating piston pumps. The inlet valve or standing valve is locked in the closed position when the pump is unanchored from the production tubing to p... | 09/17/1991 |
| 5049046 | Pump control system for a downhole motor-pump assembly and method of using same A new and improved control system for monitoring and controlling the operation of a downhole linear d.c. motor-pump assembly and a method of using it for producing a sufficient reciprocating pumping action to lift well fluid through the producing tubing o... | 09/17/1991 |
| 5015162 | Attachment for an oil well screw pump system A pumping system for a heavy oil and sand slurry from a downhole location to the ground surface includes a conventional screw type pump having a rotor and stator. At the bottom of the stator at the inlet thereto is mounted an attachment including a sleeve... | 05/14/1991 |
| 4776401 | Foot valve for pumping wells Methods of and apparatus for plugging a well below a rod pump to permit bleeding off the pressure thereabove so that the pump can be removed from the well for replacement or repairs and reinstalled for further pumping operations, the pump being connected ... | 10/11/1988 |
| 4750865 | Subsurface stuffing box assembly A method and apparatus for pumping high viscosity fluids such as viscous crude oils using a reciprocating pump powered by a reciprocating rod string where friction between the viscous fluid and the rod string and the resulting floatation effect are reduce... | 06/14/1988 |
| 4440231 | Downhole pump with safety valve Apparatus and methods are provided for installing and removing a downhole rod pump form a well while preventing flow of fluids from the well through a production tubing string.... | 04/03/1984 |
| 4280793 | Bore hole pumps A bore hole pump assembly and a method of forming the bore hole assembly, wherein a pump casing member has connected thereto a plurality of interconnectable bore hole lining pipes, with the lowermost of said pipes being connectable directly to one axial e... | 07/28/1981 |
