Abstract: A sensing device and a method for sensing the presence and absence of an object in a machine using the sensing device. The sensing device generally including a sensing mechanism, a resistive element, and a control mechanism communicatively coupled to the sensing mechanism and resistive element. The sensing mechanism being coupled to the resistive element. The method comprising actuating the sensing mechanism so that it senses the location of the object. Recording the voltage across the resistive element in the control mechanism when the sensing mechanism senses the location of the object. Reactuating the sensing mechanism at least one more time to sense the location of the object. Measuring a subsequent voltage across the resistive element when the sensing mechanism is reactuated and comparing the subsequent voltage with the recorded voltage across the resistive element when the resistive element sensed the location of the object.

Abstract: A crooked, slanted, cased wellbore extends downhole to a pay zone which is produced by a rod actuated downhole pump that lifts fluid from the bottom of the wellbore up through a tubing string to a wellhead. The pump is seated in a pump cavity, and the tubing string is tensioned at opposed ends while it is rotated. The upper end of the tubing string is attached to a fluid conveying swivel and a tubing rotator. A tubing anchor having a fluid conveying rotatable mandrel is attached adjacent to and forms part of the lower end of the tubing string by which the lower end of the tubing string is rotatably tensioned and releasably affixed to the casing in proximity to the lower end of the wellbore. A plurality of radially active slips are actuated in response to manipulation of the tubing string to extend the slips into engagement with the casing wall and to retract the slips in order to remove the tubing string from the borehole.

Abstract: A cased wellbore extends downhole to a pay zone which is produced by a rod actuated downhole pump that lifts fluid from the bottom of the wellbore up through a tubing string to a wellhead. The pump is seated in a pump cavity, and the tubing string is tensioned and is rotated. The upper end of the tubing string is attached to a fluid conveying swivel and a tubing rotator. A combination tubing anchor having a fluid conveying rotatable mandrel is attached adjacent to and forms part of the lower end of the tubing string by which the lower end of the tubing string is rotatably and releasably affixed to the casing in proximity to the lower end of the wellbore. A plurality of radially active slips are actuated in response to manipulation of the tubing string to extend the slips into engagement with the casing wall and to retract the slips in order to remove the tubing string from the borehole.

Abstract: A sensing device for monitoring the presence of a tool or other object on an automatic machine comprises a sensing head adapted to be mounted on the machine. The sensing head has a sensing needle mounted on the output shaft of a reversible motor actuated on each cycle of the automatic machine for movement through a swing angle such that the sensing needle will either contact the monitored object or complete the full swing angle movement resulting in a cycle continue or cycle stop signal to the automatic machine control. The swing angle is manually adjustable by a setting ring on the sensing head for either clockwise or counterclockwise initial rotation of the sensing needle through any desired angle up to 180.degree. degrees.

Abstract: Viscous oil in a geological formation is recovered by producing hydrogen peroxide near the formation, injecting hydrogen peroxide into the formation to effect its decomposition and reaction of oxygen with resident hydrocarbon, and recovering oil in response to injection of hydrogen peroxide.

Abstract: Oil is recovered from underground formations more efficiently by the use of a subsurface power piston that reciprocates a subsurface pump. A series of connecting rods called sucker rods connects the power piston to the subsurface pump. The subsurface power piston is driven upward by a surface mounted hydraulic actuation system. The power piston and sucker rod travel downward by the force of gravity. The distance between the subsurface pump and power piston is set so the pressure at the depths of the power piston and pump closely counterbalance the weight of the sucker rod string at all positions of stroke with a slight down bias. The free-body piston of the surface actuator acts as a membrane member between the refined oil of the surface actuation system and the fluid being recovered. The pumping action occurs on the downstroke of the subsurface equipment. The pumping speed is automatically and optimally adjusted according to fluid parameters.

Abstract: An articulated conveyor comprising a conventional endless-loop chain-link conveyor belt traveling over a fixed frame section, an adjustable frame section mounted for translational movement on a guide carrier, and a floating frame section pivotably mounted to connect the fixed section to the adjustable section. The guide carrier permits translational movement of the adjustable frame section in a direction perpendicular to the longitudinal axes of the adjustable frame section and the fixed frame section to provide parallel offset of the adjustable section with respect to the fixed section. Longitudinal guide slots in the upper and lower faces of the three frame sections engage center tabs on the bottom of the belt to guide the belt for travel along the frame sections.