Oil Pumping Unit Research Articles

The Mechanical Structure of a New Energy-Saving Pumping Unit Analysis by Pro/E

Traditional oil drilling equipment cannot meet the demand of oilfield drilling technology in the later period. Application of new technologies, energy saving and cost reduction are development directions of the oil pumping machine. This paper introduces a new energy-saving hydraulic pumping unit with hydraulic energy recovery system, which drives the hydraulic cylinder to finish pumping action that can reduce the equipment power by 40% under the same load. In this paper, the mechanical structure of a new type of oil pumping unit is built and analysis is done by Pro/E software. The analysis results show: The guiding vehicle mechanism itself contributes to counterweight, and hydraulic actuator is directly connected to the base. So it has the advantages of a simple structure, saves steel, light weight, smaller in size and the manufacturing process requirements are not high. This shows that the machine can directly replace the traditional conventional beam pumping unit and has higher application value.

Design of New Energy-Saving Pumping Unit Suitable for Remote Areas and Heavy Oil Recovery

At present, China's key oil and gas exploration and development was directed to heavy oil reservoirs and reservoirs in remote areas. As the main mechanical oil recovery equipment, pumping unit in general has some shortcomings in developing these kinds of reservoir, such as high energy consumption, short maintenance cycle, high cost of production management, and not suitable for remote area of harsh environment. In view of the deficiencies of the existing oil pumping unit, a new type of energy-saving pumping unit is designed with high efficiency and energy saving, stable and reliable, long pump inspection cycle, convenient maintenance and low-cost. It can fully meet the needs of production and maintenance for viscous oil wells and remote wells.

Sensor Network Based Oilwell Health Monitoring and Intelligent Control

Most oil pumping units (OPUs) have been using manual control in the oilfield. This existing oil-pumping system, a high power-consuming process, has the incapability of OPU's structural health monitoring. In this paper, a sensor network based intelligent control is proposed for power economy and efficient oilwell health monitoring. The proposed sensor network consists of three-level sensors: (1) several types of basic sensors, such as load sensor, angular sensor, voltage sensor, current sensor and oil pressure sensor, which are the first level sensors (FLS), are used for oilwell data sensing; (2) our developed intelligent sensors (IS), which belong to the second level sensor, are designed mainly for an oilwell's data elementary processing, main fault alarm/indication, typical data storage/indication, data/status transmission up to the third level sensor (TLS), data/status transmission between IS, and command transmission down to the OPU motor; and (3) our developed software-defined (SD) control centers with an embedded database, i.e., the TLS, are designed for hundreds of oilwells data storage/management, data processing, malfunction detection, malfunction alarm/indication, stroke-adjustment command transmission down to a specific IS for power economy and the malfunction report to the maintenance staff via global system for mobile communications (GSM) short message service (SMS). Experiment results at the Chinese Petroleum's Changqing Oilfield demonstrate our proposed sensor network based system.

Study of Energy-Saving Control in Oil Pumping Units Based on DTC Technology

The pumping unit is the main pumping equipment in the oil field. However, there widely exist such defects as low pumping efficiency, high energy consumption, much time and great efforts consumption in stroke adjustment etc. in the current pumping unit, resulting in serious waste of energy. Some energy-saving technologies in pumping units have been developed, but the effects are not quite good. Aiming at this situation, this paper introduces a new type of motor control theory - Direct Torque Control. By controlling the stator voltage, the technology achieves the direct control of the motor torque. Meanwhile, with the combination of the motor running condition of pumping units, study of energy-saving control based on DTC technology is carried out. It turns out that the energy-saving effect is significant according to the application and test results of the energy-saving control device in the oil field. Therefore, the control device can bring certain economic benefits and have the value of popularization and application.

An Explicit Analysis Method for Walking-Beam Oil Pumping Unit

Based on the theory of linear transformation and vector operations, an explicit analysis method is proposed for walking-beam oil pumping unit, which overcomes the difficulties of traditional method: roots discriminating of quadratic equations method and angle quadrant discriminating trigonometric functions method. The kinematics and torque factor of suspension point, and the crank torque of the three kinds of walking-beam pumping units are calculated in a new way according to the rule of power conservation, which avoids the complex calculation of the force bore by each rod. The validity of this proposed method is illustrated with a numerical example.

Linear Electromagnetic Oil Pumping Unit Based on the Principle of Coil Gun

Projectiles in coil gun usually make one-way movement and move at a very high speed. The device would be fit for the application of oil pumping unit, as long as the projectiles can make reciprocating movement and move slower by adopting proper control methods. At present, during the production process of petroleum, the efficiency of the system is rather low. Energy dissipation takes a considerable ratio in the total cost of oil production. Moreover, beam pumping-unit system suffers from long driving chain, poor flexibility, a quite huge capacity and weight under long length of stroke, and low efficiency. Aiming at the earlier problems, linear electromagnetic oil pumping unit is presented in this paper, which is essentially a multiphase coil launcher. Analysis is made about the advantages and disadvantages of three-phase and multiphase structures, as well as the practical structure. Simulation studies are made; meanwhile, experimental investigations are carried out on a small-scale-model machine system. Further simulation studies of coil launching system are carried through the mechanical and mathematical models of rod string in a sucker-rod pumping-unit system. Theoretical analysis and experimental results verify the feasibility and the validity of the proposed system. Thus, a new path to solve the problem of high energy dissipation in oil production is explored.

A high torque density permanent magnet motor for oil pumping unit

A low speed, high torque density compound permanent magnet (PM) motor is developed for oil pumping unit to reduce energy consumption. It consists of dual axial-field PM motors and an outer rotor PM motor. In order to account for the influence of skew, a multislice two-dimensional finite element method is employed to analyze the air gap field distribution, back-emf, cogging torque, and electromagnetic torque. Predicted results are validated experimentally.

New-generation electric pumping unit with enhanced suction capacity

An NGPNA 3600-120 horizontal booster oil pumping unit designed to deliver oil or oil products from tanks to main pumps is shown. Special features of operation of the pumping unit and major technical and technological solutions incorporated in the design of the pump and its technical specifications are given.

New generation of multifunctional mobile high-pressure oil and gas field pumping units

Technical data and description of basic versions of UNB type of mobile pumping units designed for operation with almost any abrasive-containing, fast-hardening, corrosive, and other fluid media having densities of up to 2.4 g/cm3 are given. The equipment of the units is mounted on truck chassis fit for long-distance traveling.

A new series of unitized mobile high-pressure oil and gas pumping units

Technical characteristics of several versions of a unitized series of pumping units differing essentially in hydraulic blocks, materials of domestic elements of the delivery lines, and high-pressure safety devices are given. Designs of blocks of the pumping unit are described.

Synthesis and Analysis of Stroke-Increasing and Force-Balancing Mechanisms for Rod Pumping Units

Abstract This paper introduces a creative synthesis and analysis of stroke-increasing and force-balancing mechanisms for rod oil pumping units by using the systematic linkage technique. The corresponding relations between the kinematic components in mechanisms and the link element in associated linkage are determined. Four acceptable associated linkages are used to create eight new types of mechanisms for rod oil pumping units. Formulas are derived for calculating stroke, counterweight mass, and driving force. For each synthesized mechanism, an analysis of properties, working loads, and strokes is conducted. Finally, a better mechanism for the rod oil pumping units is presented.

Experimental study on a novel linear electromagnetic pumping unit

High loss of energy is a common problem in all oil fields. It is mainly caused by the intrinsic disadvantage of traditional beam-pumping units, such as complex transmission devices, short stroke, low efficiency, etc. The aim of this paper is to apply electromagnetic launch technology in oil-pumping unit. Both electromagnetic launch technology and linear motor technology are combined to develop a novel direct-driven electromagnetic pumping unit (EMPU) in which each coil is driven and controlled separately. The principles and working process of the electromagnetic pumping unit are described. With the conditions of work environment being taken into consideration, experiments were conducted to test and verify the performance of the model prototype. The disadvantages of a traditional oil-pumping unit are overcome by the novel linear electromagnetic pumping unit.

Computer Model Evaluates Oil Pumping Units in Inclined Wells

Abstract The paper analyzes the dynamic behaviour of the sucker rod string in the inclined well. In this case, due to the curvature of the tubing the rod vibrates longitudinally as well as transversally. A mathematical model of the vibrating string consisting of two coupled differential equations was developed. The paper describes the fundamental assumptions and simplifications which can be used in the numerical analysis. The examples of the results are also presented. They include the effect of the distortion of the geometry of the rod string on the plunger load-displacement diagram and the diagram of the friction forces along the rod string. Introduction The evaluation of pumping units in the inclined wells has been a serious problem in engineering practice. The common practice at present is the application of the program developed for vertical wells to the analysis of deviated wells. This introduces substantial errors in the calculations of the stresses in the rod string and as regards the gearbox torques. Generally, the maximum torques calculated properly for the actual geometry of the slant hole pumping unit can be up to 40% larger than the corresponding values obtained from the calculations for vertical units. Besides, the application of the program for vertical wells to the evaluation of inclined, wells gives results in which all the friction forces from the rod string are concentrated at the plunger. This gives false prediction of high compressive forces at the bottom of the rod string and can be the reason for the wrong conclusions regarding the rod stability. The rod in the inclined well is under different static and dynamic forces than in the vertical one. It is supported by the tubing of wheeled couplings but it is also transversely loaded by its own weight. Therefore, the dynamic behaviour of the sucker rod in the deviated well is much more complicated and different from a vertical one. The differences are caused by the friction between the rod string and the tubing and the rod curvature. If the tubing is curved, the dynamically loaded rod string deforms and comes into contact with the wall of the tubing. The curvature causes the lateral displacements of the rod inside the tubing. It couples the longitudinal vibrations with the transverse vibrations. The axial compressive forces at the bottom of the well can buckle the rods. In this case, the problem becomes nonlinear and difficult to solve. The need to obtain a model for use in the evaluation of pumping units and downhole equipment in the inclined and deviated wells resulted in the development of an applicable design and optimization technique. SRPUMP computer program was developed a tool that allows a high level of expert knowledge to be applied daily in the field, dealing with problems of the inclined wells. Fundamental Assumptions An accurate prediction of the performance of the sucker rod string and the bottomhole equipment requires careful modelling of the dynamic behaviour of the rod.

Experience with the construction and performance of pile foundations under oil pumping units : Chizhevskii, M V Soil Mech Found Engng, V17, N4, July–Aug 1980, P125–127

Experience with the construction and performance of pile foundations under oil pumping units : Chizhevskii, M V Soil Mech Found Engng, V17, N4, July–Aug 1980, P125–127

Experience with the construction and performance of pile foundations under oil-pumping units

Experience with the construction and performance of pile foundations under oil-pumping units