A method for evaluating data from a reciprocating downhole pump includes the steps of acquiring downhole position and load data, providing the position and load data to a processing unit, normalizing the position and load data, converting the position and load data to a calculated polar coordinate data set, evaluating the calculated polar coordinate data set to determine a condition or occurrence at the reciprocating pump, and outputting calculated key parameters for controlling and optimizing the reciprocating pump and beam pumping unit. The method further comprises a step of creating a library of reference data sets, comparing the calculated polar data set against the library of ideal and reference data sets, identifying one or more reference data sets that match one or more portions of the calculated polar data set, and outputting the probability of one or more of the known conditions within the calculated polar data set.

Sensor systems and methods for downhole pumping systems include a sensor subsystem for detecting movement of at least one component of the downhole pumping system. The sensor subsystem includes an axial motion sensor to be coupled to the at least one component of the downhole pumping system and to detect axial movement of the at least one component of the downhole pumping system and a rotational sensor to be coupled to the at least one component of the downhole pumping system and to detect rotational movement of the at least one component of the downhole pumping system by sampling rotational velocity values with the rotational sensor generated by rotation of the at least one component of the downhole pumping system.

A tool for use in suspending operation of an oil or gas well driven by an artificial lift with a polished rod connected to a sucker rod in a tubing string. The tool includes a body having a lower narrow portion dimensioned to fit within the interior cavity of a tubing string inlet or an upper extension thereof, and an upper wide diameter portion defining a substantially horizontal landing surface dimensioned to rest upon the top edge of the tubing string inlet or the upper extension thereof. The tool includes one or more sucker rod-engaging structures and one or more longitudinal slots extending through the lower narrow portion and the upper wide diameter portion to allow passage of fluid or gas through the tool when the tool is supported on the top edge of the tubing string inlet or the upper extension thereof.

A lubricating element for drag reduction in production and transportation of water-cut heavy oil in a wellbore comprises a flow guide component and a shell component; the flow guide component is fixed in a cyclone chamber of the shell component, and is provided with an intermediate rod to connect and fix a center cone, a flow stabilizing cone and flow guide blades. The lubricating element is a static element integrating three functions of oil-water separation, water control and liquid ring formation, thereby reducing energy consumption for production and transportation of heavy crude oil, and cutting down surface water treatment facilities.

A hang-off system for suspending a rod string within a well is provided. In one embodiment, such a system includes a hang-off ram of a blowout preventer and a hang-off sub sized to fit within a bore of the blowout preventer. The hang-off ram and the hang-off sub have complementary surfaces that enable the hang-off ram to engage the hang-off sub within the blowout preventer to facilitate suspension of a sucker-rod string in a well from the hang-off sub. Additional systems, devices, and methods are also disclosed.

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.

This invention discloses a downhole occluder for oil wells. A sealing socket and a positioning flange with sealing surfaces are set up inside an oil pipe. An oil sucker rod pump is installed inside the tubular column which mounts on top of the sealing socket. A sealing surface of a sealing flange on the rod pump mounts with a sealing surface of the sealing socket on the tubular column. Outer oil inlet borings are placed at the wall of oil tubular column underneath the positioning flange. An inner pipe is installed inside this section of tubular column. Place inner oil inlet borings on the inner pipe wall corresponding to outer oil inlet borings on the tubular column. Sealing grooves are placed underneath the inner oil inlet borings on the inner pipe wall. Sealing rings are placed in the sealing grooves to seal the inner wall of tubular column. Top of inner pipe is connected to oil sucker rod pump through connecting coupler. Bottom end of tubular column is occluded. The structure of this invention is simple, reasonable and reliable to perform the well maintenance works of pressurized sucker rod and oil pipe. It brings the convenience to repeatedly occlude the pressure under the well to result in a safe, highly efficient, environmental and energy saving production.

A polished rod sealing device for an oil pumping machine includes a built-in stuffing box. The built-in stuffing box is arranged inside oil pipe enlargement press cap and can seal the polished rod of the oil pumping machine. The sealing device maintains dynamic coaxiality between the polished rod and the stuffing box, and reduces eccentric wear of the sealing packing resulted from the polished rod. The sealing device also provides lubrication between the polished rod and the sealing packing.

A downhole tubing rotator that has a housing configured into a production tubing string in a well in a reservoir, the housing being generally cylindrical with a hollow center and containing a two pole, three phase induction squirrel cage motor operatively connected to a tubing rotator configured to clamp onto a production tubing joint and rotate one or more production tubing joints (but not an entire production tubing string) when the motor is activated. An armor-protected insulated power and control cable connects the motor to a control box positioned at a surface of a reservoir and various sensors provide feedback for the unit. Methods of using this tool are also provided.

A helical solid profile attached and originating from the outer diameter of a composite or steel sucker rod and extending approximately to the inner diameter of the production tubing, running axially along the sucker rod body and affixed to it for reinforcement and stabilization of the sucker rod tension member body in axial alignment to the central axis of the production tubing which the sucker rod member is housed in, whereas the helical solid profile is made of material which is for acceptable use within the production system environment, the helical solid profile purpose being to control and reduce the sucker rod's deflection during compressive moments, extending the life of the sucker rod or reduction in stress and erratic buckling cycles.