Abstract: A downhole, hydraulically actuated pump assembly, having an engine reciprocatingly connected to a production pump. Power fluid is conducted downhole to the engine of the pump assembly, while production fluid and spent power fluid is conducted uphole to the surface of the ground.The pump assembly includes a housing within which spaced, axially aligned, cylindrical chambers reciprocatingly receive spaced engine and pump pistons which are connected together in a manner to enable the engine to reciprocate the production pump.A mechanically actuated valve assembly is contained within the engine piston and is arranged respective to various different flow passageways so that flow of power fluid through the engine forces the engine piston to reciprocate.The valve assembly includes a control rod and a valve element concentrically arranged respective to one another and to the engine piston. The valve element is reciprocated respective to the engine piston in response to the reciprocation of the control rod.

Abstract: An o-ring seal assembly in combination with a downhole pump and an o-ring collar. The seal assembly includes a special o-ring device and two coacting seal holding members which cooperate together to provide an o-ring groove, and which separate to enable an o-ring of this invention to be received therewithin. The special o-ring includes a resilient o-ring and a retainer. The o-ring has an annular face thereof bonded to a concave face formed on the retainer member. In one form of the invention the retainer member is in the form of a cylinder having an outer concave wall bonded to the inner annular face of the o-ring. In another embodiment of the invention, the retainer member is in the form of an apertured disc having an upper concave wall bonded to a lower annular face of the o-ring. The o-ring preferably is made of rubber or rubber-like material while the retainer member is made of metal and is vulcanized to the rubber o-ring.

Abstract: A downhole, hydraulically actuated pump assembly of the free or fixed type which includes a control valve positioned above the engine, and a plurality of pistons connected together by a hollow connecting rod. The pistons are arranged to divide a production cylinder from an engine cylinder, so that the connecting rod is always placed in compression, thereby avoiding rod breakage. The hollow connecting rod is employed to supply power fluid to the lower engine, and the rod ends are arranged to have fluid pressure exerted thereagainst to improve the operation of the pump assembly.The production pump divides the engine into an upper and lower engine assembly so that the upper engine strokes the pump in a downward direction, while the lower engine strokes the pump in an upward direction.

Abstract: A downhole, hydraulically actuated, double acting pump of either the fixed or the free type, having a control valve positioned above the engine. The engine has a power cylinder chamber arranged at each extremity thereof, so that the connecting rod is placed in compression on each stroke of the engine.The downhole pump includes spaced, external seals which form spaced, concentric, annular flow chambers therebetween, which cooperate with the various flow paths formed within the pump to enable a maximum size piston to be utilized within the apparatus. Hence, the power fluid and production fluid flow along unique flow paths, which are not formed within the side wall of the pump housing; and therefore, the apparatus accommodates a maximum diameter piston.

Abstract: A valve device for controlling fluid flow into and out of the working chamber of a reciprocating pump. A valve body axially receives the pump connecting rod and includes circumferentially extending, alternately arranged, intake ports and exhaust passageways. Seats are formed on opposed sides of the main body, and a spring-loaded plate abuttingly engages the seats.An outwardly directed annulus circumferentially extends about a central,, marginal portion of the main body and communicates with the inlet port by means of an outwardly directed cavity which is formed by milling a crescent-shaped portion of a cylinder having an outer peripheral edge portion which intersects the centerline of a vertically disposed, constant diameter port, while the centerline of the axial passageway, port, and cylinder lie along a common line drawn normally to the longitudinal central axis of the valve body.

Abstract: The method and apparatus for producing an oil well, by the provision of a pumpjack unit which reciprocates an engine assembly located within the upper extremity of a wellbore. The engine assembly has a power piston which hydraulically drives a lift piston by means of hydraulic fluid being transferred therebetween. The lift piston is directly attached to and reciprocates a string of sucker rod, which in turn reciprocates the downhole production pump.The hydraulic fluid associated with the engine assembly is contained within a closed system, and the relative sizes of the power and lift pistons are of a ratio to cause the lift piston to travel a greater distance respective to the power piston, thereby enabling a relatively short stroke of the polish rod to impart the piston of the subsurface pump with a relatively larger stroke.

Abstract: An alarm system having means by which unauthorized entrance into an enclosure activates electro-mechanical apparatus which dials a second telephone from a first telephone, thereby informing whomever might be present at the second telephone that a particular location is being burglarized.

Abstract: A relatively large power fluid tubing is run downhole and connected to a relatively small power fluid tubing. The small power fluid tubing is connected to the valve assembly of a downhole pump. The small diameter tubing and pump is enclosed within a production tubing having the lower end thereof sealed to the pump inlet, with the lower end of the pump being placed in fluid communication with formation fluid. The upper end of the production tubing is vented and supported from the relatively large diameter power fluid tubing. A packer is disposed below the vent. Production from the pump occurs through an annulus which is formed between the small power tubing and the production tubing. Produced fluid from the pump flows through the annulus, through the vent, and up through the borehole annulus, while power fluid flows to the valve assembly of the pump engine by means of the series connected large and small power fluid tubing.

Abstract: A downhole fluid actuated pump assembly for use in a borehole. Power fluid flows downhole to an engine which actuates a pump, and the pump lifts production fluid to the surface of the earth, with the spent power fluid from the pump assembly being co-mingled with the production fluid.The pump assembly has cylinders spaced from one another by a valve assembly with each of the cylinders being divided into upper and lower chambers by a piston, with one side of each piston being used as the engine while the remaining side of each piston is used for pumping formation fluid.A common connecting rod connects together the pistons and the valve assembly. The interior of the rod is hollow and forms a flow passageway for flow of power fluid to the valve assembly and to a balance tube.

Abstract: A plunger for a downhole pump having a hollow mandrel with a concentrically arranged resilient cylinder thereabout, with an annular chamber formed between the mandrel and the cylinder. The annular chamber is flow connected to the interior of the hollow mandrel so that pressure which is effected within the hollow mandrel also is effected within the annular chamber causing the resilient cylinder to expand radially outwardly into engagement with the interior surface of the working barrel, thereby more efficiently sealing the plunger to the working barrel.

Abstract: An alarm system having means by which unauthorized entrance into an enclosure activates mechanical apparatus which dials a second telephone from a first telephone, thereby informing whomever might be present at the second telephone that a particular location is being burglarized.