A high-strength and corrosion-resistant sucker rod and a preparation process thereof are disclosed. Raw materials for preparing the high-strength and corrosion-resistant sucker rod include, by weight percent, Mn: 0.70% to 1.20%, Cr: 9.50% to 13.50%, Ni: 0.65% to 1.10%, Mo: 0.10% to 0.90%, Cu: 0.28% to 0.56%, C: ≤0.07%, Si: ≤0.50%, P: ≤0.08%, and S: ≤0.005%, the balance is Fe and unavoidable impurities. The sucker rod prepared by the new process has an actual grain size equal to or greater than grade 8, excellent mechanical properties that meet the standard of grade HL specified in SY/T5029 Sucker Rods, and excellent corrosion fatigue resistance. The preparation process is simple and easy for operation, and suitable for large-scale promotion.

A controller for operating a rod pumping unit at a pump speed. The controller includes a processor configured to operate a pump piston of the rod pumping unit at a first speed. The processor is further configured to determine a pump fillage level for a pump stroke based on a position signal and a load signal. The processor is further configured to reduce the pump speed to a second speed based on the pump fillage level for the pump stroke.

A pump apparatus for pumping fluid from a well has a cylinder having upper and lower ends with inlet ports, a hollow pump rod defining a plurality of pump rod entry ports, a travelling two-way valve separating a cylinder interior into variable volume upper and lower chambers and first and second one-way valves mounted to the cylinder to seal the inlet ports.

A sensor apparatus is provided for transmitting data of a polished rod in a rod pumping system, the rod pumping system including a rod rotator that rotates the polished rod. The sensor apparatus includes an outer shell configured to receive the polished rod, a signal processor within the outer shell, a position sensor within the outer shell and configured to sense and output to the signal processor a position signal, and a magnetic pickup sensor configured to sense and output to the signal processor a signal indicating a sensed magnetic field. The signal processor is configured to count a number of strokes of the polished rod based on the position signal, and to determine whether a fault exists based on the number of strokes and the signal indicating the sensed magnetic field.

A long stroke pumping unit includes a tower and a counterweight assembly movable along the tower. A belt includes a first end connected to the counterweight assembly and a second end connectable to a rod string. A prime mover is used to reciprocate the counterweight assembly along the tower. A sensor detects the position of the counterweight assembly, and a load cell measures the force exerted on the rod string. A motor is provided to adjust an effective weight of the counterweight assembly during reciprocation thereof along the tower. A controller communicates data with the sensor and the load cell and controls the adjustment force exerted by the adjustment motor.

A control system for operating a beam pumping unit includes a strain gauge and a beam pumping unit controller. The strain gauge is coupled to a Samson post of the beam pumping unit, and is configured to measure a Samson post strain. The beam pumping unit controller is coupled to the strain gauge and is configured to operate the beam pumping unit to induce a variable load on a rod of the beam pumping unit. The beam pumping unit controller is further configured to receive the Samson post strain from the strain gauge and compute the variable load based on the Samson post strain.

A jointed plunger assembly has a north end cap, a south end cap, and a body therebetween. The body includes at least one joint segment. In one embodiment, multiple joint segments are provided. Joints are formed throughout the body. In one embodiment, a flex rod is positioned in the north end cap, south end cap, and body. The flex rod is configured to flex and also seal fluid within the assembly, thereby preventing fluid leakage and helping to ensure that pumped fluid is moved upward and away from the pump. The assembly is configured to flex at each joint and is capable of flexing in various directions to follow the contours of the wellbore and the pump barrel. This configuration provides increased efficiency for deviated and horizontal pumping operations and helps the assembly components to wear more evenly, extending plunger life.

A prime example of an application for a head with contiguous counterweight is a sucker rod reciprocating pump whose circular arc head is contiguous with a counterweight and is pivotably connected to the pitman arm, crank arm weight, and speed reducer. The pitman arm is substantially horizontal and the crank arm to wrist pin phase angle is about 70-90 degrees. Auxiliary counter weight extends from the head weight on a stinger and the head weights are adjustable. The head weight diameter is either constrained within the circular arc head's outer diameter or can be larger. The upper pitman bearings are outboard on the equalizer which is integral with the head. The center bearing of the head is outboard on the rectangular sampson post. The head counterweight increases permissible load on a speed reducer. This example use of a head with contiguous counterweight has can be configured to utilize beneficial embodiments for adjusting sampson post height and pitman arm length; and for changing the stroke length without removing the wrist pin from the crank weight hole.

Cushioning dampers are beneficial for preventing stress cracks on a sucker rod reciprocating pump whose circular arc head is contiguous with a counterweight and is pivotably connected to the pitman arm, crank arm weight, and speed reducer. The pitman arm is substantially horizontal and the crank arm to wrist pin phase angle is about 70-90 degrees. Auxiliary counter weight extends from the head weight on a stinger and the head weights are adjustable. The head weight diameter is either constrained within the circular arc head's outer diameter or can be larger. The upper pitman bearings are outboard on the equalizer which is integral with the head. The center bearing of the head is outboard on the rectangular sampson post. The head counterweight increases permissible load on a speed reducer. This invention has embodiments for adjusting sampson post height and pitman arm length; and for changing the stroke length without removing the wrist pin from the crank weight hole.

A method of producing hydrocarbon fluids from a wellbore. The method comprises providing a wellbore, with the wellbore having been completed with a tubular string along a horizontal section. The tubular string may be a string of production casing, or joints of slotted tubular bodies. The method also includes running a fluid pumping system into the wellbore. The fluid pumping system comprises a sucker rod string, a traveling valve residing at a lower end of the sucker rod string, and a standing valve releasably connected to a lower end of the traveling valve. The method additionally includes landing the standing valve into a seating nipple along the horizontal section of the wellbore, and then releasing the standing valve from the traveling valve while the fluid pumping system is in the wellbore. The method further includes operating a pumping unit at a surface to produce hydrocarbon fluids from the production casing.