Electric Pump Unit Research Articles

The Research and Development of the Amphibious Disaster-Resistant Submersible Pump with Dual Pump and Dual Motor

This thesis introduces a kind of horizontal wet electric submersible pump unit with both submersible and nonsubmersible operational models which can be installed permanently. Then, it analyses the structural features, operating principles, main component performance and rotor system. A series of technical advantages show that this kind of submersible pump has a bright application prospect in conventional drainage and disaster-resistant emergency drainage of deep mines.

Determination of electrical centrifugal pump unit capability based on pressure survey results with thermal and manometrical system at the pump suction

The article shows the possibility of getting of additional information about determination of productivity of electric centrifugal pumping unit, as well as productive parameters of well by using of measurements with the help of precise thermo manometric system at the pump suction. The equipment of mechanized stack of wells with remote pressure and temperature sensors at pump suction enables to solve the tasks more precisely. Using of telemetry systems with thermo-manometric sensors constantly fixing parameters of downhole pumping equipment and environment is a promising direction for solving the tasks of pressure transient analysis of mechanized stack. As distinct from wave measuring the TMS sensor detects pressure on suction level of electrical borehole pump, that is why there is not necessity to calculate the fluids density in annular space above electrical centrifugal pump while calculating bottom hole and rock pressure. Thus, due to widespread introduction of borehole pumps equipped with pressure sensors in oil production, there are no problems with borehole pressure data logging. But direct measurement of fluid flow rate coming from the bed is a difficult task, especially for marginal wells. Classic pressure transient analysis technologies do not provide determining the change in flow rate over time, and this variable is fixed (for example: pressure transient analysis after well start-up with constant production rate, immediate cease of fluid flow from the bed after well shut-in from steady state). The relevance of the topic is determined by necessity of developing the well survey methods at nonsteady state during the process of start-up and improving the results of hydrodynamic studies interpretation quality. Results of the researches confirmed the adequate accuracy of the determination of productive characteristics of well under the pressure suppression curve.

The Stress Analysis of Joint Connecting Bolt of Submersible Electric Pump

Submersible electric pump units are connected by bolts. This paper uses finite element analysis method to simulate how the pump joint bolt behave when it transmit torque.In this paper, temperature method is adopted to simulate the bolt preload and axial deformation.It also used to analyse and calculate the limited value when submersible electric pump units transmit torque under different preload. All of this provide the designing of connecting bolt preload and construction with theoretical basis.

New technology of electric centrifugal pump operation in deviated wells

A flexible coupling designed to ensure physical flexibility of electric centrifugal pumping units, which makes it possible to run-in (lower) and operate the unit at an angle of up to 5° between the shafts, has been developed, made, and tested. It has been established that the flexible coupling reduces vibration and increases delivery. Bench and industrial tests have demonstrated the effectiveness of use of the flexible coupling.

Development of an electric motor-driven pump unit for electro-hydraulic power steering with 42V power-Net

Motorization in vehicles is expanding rapidly for fuel efficiency, customer comfort, convenience, and safety features. These new electric loads represent an increase in the required electric power. This has generated interest in new, higher power systems such as the 42V Power Net. The electro-hydraulic power steering (EHPS) system is one of these systems. This paper presents the development of the electric motor-driven pump unit for the EHPS system using a 42V power-Net. The interior type permanent magnet synchronous motor (IPMSM) can be applied to this system with more power density per volume for compactness of the EHPS. In order to improve the system, the IPMSM and its control method was optimized for improved torque characteristics and electric power consumption. The performances of both the pump unit and the IPMSM have been verified by experimental results. Finally, all in one type the electric motor-driven pump unit are developed from the experiment verification.

Statistical analysis of operational reliability for electric pump units CN 60–180 of VVER-1000 reactors with root estimation methods

We consider the problem of processing statistical data obtained during the operation of pumping units CN 60---180 operating as standard equipment of the VVER-1000 reactors. Data for analysis was taken from the industry database of VNIIAES. The objects' operation has been observed from January 1, 1990 to December 31, 2007. Statistical information is processed with nonparametric estimation method called root estimation. We obtain reliability characteristics for the units: time-to-failure density and distribution function, faultless operation probability, and fault intensity. The obtained results are used to determine control influences.

Modern pumps made by Turbonasos Enterprise for pumping oil and oil products

Designs of NVN and NV-D-1M types of modern semi-submersible electric pumping units for pumping stock-tank (commercial) oil, corrosive and neutral stratal water, water-oil emulsion, gas condensate, etc., are presented. The advantages and typical features of hydrostatic and hydrodynamic sliding bearings are shown. A schematic design of the transmission and booster support of one of the pump models is shown.

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.

Combined electrical and mechanical model of electric submersible pumps

The electric submersible pump unit consists of a pump powered by a medium-voltage three-phase induction motor. The power transmission system is integrated with the riser pipes. Starting the pump causes heavy dynamic stresses on the motor shaft and the mechanical connection between pump (impellers) and shaft. The motor and its load will generate transient torque pulsations that may be damaging to shaft and coupling, particularly to the key grooves. System models are developed to predict the electrical and mechanical conditions on starting. Different torsional models with certain types of nonlinearities, combined with different motor models have been examined to find combinations that give the best results. The motor models applied include saturation in the main flux path and the leakage flux paths, as well as rotor deep bar effect. It has been shown how the pump parameters, material coefficients, design dimensions, and number of impellers affect the dynamic stresses. The aim has been to optimize the design with respect to the transient stresses. The simulations reveal that the resulting shaft torque, caused by excitation from resonant frequencies during the acceleration period, amount to high values that may result in excessive overloading of shafts, couplings, and key grooves. Maximum torque is, as expected, strongly dependent on the shaft dimensions. Certain shaft diameters may cause resonance and, thereby, heavy torsional amplitudes. It has been shown how the model can be a tool in the struggle to find the optimum shaft diameter.

Development of High-Load Water-Lubricated Radial-Axial Bearings for Electric-Pump Units in the First Loop of a Nuclear Power Plant

Development of High-Load Water-Lubricated Radial-Axial Bearings for Electric-Pump Units in the First Loop of a Nuclear Power Plant

Operation of submersible electric pumping units in the “Lyantorneft'” Oil-and-Gas Division of the “Surgutneftegaz” Company

Operation of submersible electric pumping units in the “Lyantorneft'” Oil-and-Gas Division of the “Surgutneftegaz” Company

Conditions for starting electric pump unit

The conditions for starting water-immersible electric pumps depend on many factors~ viz., the depth of immersion of the pump into the well, the water level in the well, the state of the delivery pipe, the motor power, the power and voltage in the terminals of the power source, its load, the length and cross section of the electric wires, and many others. The starting conditions become more complicated as the capacity of the unit increases. In view of this, for fabricating the first ETsV 12-63-520 electric pumps with an immersion depth greater than 500 m we studied, taking account of the potentials of the experimental station, the conditions for starting the unit as a function of the voltage in the motor terminals, the length of the electric wire and its location, the location of the gate valve in the pump delivery line.

Submersible electric pump unit for lifting seawater

Submersible electric pump unit for lifting seawater

Salt Flat Oil Field, Caldwell County, Texas

The Salt Flat oil field in southern Caldwell County, Texas, was opened October 13, 1928, making the third oil field in Caldwell County producing from the Edwards limestone. A daily peak of 52,013 barrels was reached on June 18, 1929. In all, 343 wells have been drilled, only 25 of which are dry holes. The Salt Flat field is located parallel with, and on the southeast or upthrown side of, a fault which strikes N. 30° E. The fault has a maximum vertical displacement of 375 feet. The pay formation is the upper 25-35 feet of the Edwards limestone (Comanche), which is a porous dolomitic limestone with lenses of indurated cherty limestone. The upper few feet of the pay formation is ordinarily soft yellowish limestone, commonly referred to as dobe. A few wells have encountered commercial production above the Edwards limestone. The surface beds in the Salt Flat field are Wilcox sand and shale, which are Eocene or early Tertiary in age. The Salt Flat field, which consists of 1,196 productive acres, produced 13,790,362 barrels of 36° gravity oil (A. P. I.) to the end of 1929. It is estimated that the ultimate recovery will be approximately 30,000 barrels per acre, or a total recovery of approximately 36,000,000 barrels of oil for the entire field. The average depth to the pay horizon is 2,700 feet, and rotary methods of drilling have been used exclusively. Most of the wells are pumped with individual electric pumping units.