Electric Pump Unit Research Articles

Technological quality support when turning thin-walled parts made of titanium alloys of electric pump units of the spacecraft temperature control system

Technological quality support when turning thin-walled parts made of titanium alloys of electric pump units of the spacecraft temperature control system

Complex ground diagnostic system for spacecraft electromechanical devices

One of the ways to make spacecraft electromechanical devices much reliable is the diagnostics of their technical condition during ground tests and identification of possible defects. Authors have viewed questions of spacecraft electromechanical devices’ diagnostics. There is an overview of the state-of-the-art applied diagnostic methods with the proposed complex diagnostic method, including, apart from vibration-based diagnostics, methods of the analysis of the vector module and vector hodograph of the electric engine’s equivalent current. Authors presented spectral characteristics of vibration acceleration signals and equivalent current, as well as hodographs. They also identified generic criteria for current diagnostics. The narration includes the description and function circuit of the ground complex diagnostic system for the engine of the electric pump unit (EPU) at the spacecraft thermal control system. It also includes the software interface for the system.

APPLICATION OF MULTIFUNCTIONAL POWER CABLE FOR DOSED SUPPLY OF CHEMICAL REAGENTS TO THE WELL

Most of the developed oil deposits in Russia reach the final stage of development. It is characterized by a large percentage of water cut in well products and a gradual increase in the frequency of repair work in production and injection wells. Therefore, almost all oil companies allocate huge funds for the development of technologies designed to increase the success of oil production from producing wells. The performance of an electric centrifugal pump unit depends on a large number of factors. These factors include gas content, the presence of salt and paraffin deposits, etc. Largely because of these complications, the overhaul period of pumping equipment, the production rate of oil wells, the throughput of oil pipelines are reduced, premature failure of various equipment occurs, and there is a need for large number of unplanned repairs, which in the future leads to a decrease in the level of production and additional costs. This article discusses the technology of using a multifunctional power cable for the dosed supply of a chemical reagent into the wells at the Klyuchevoye deposit, due to which it is possible to reduce the intercleaning and overhaul periods. The aim of the work is to study the technology of using a multifunctional power cable for dosed supply of a chemical reagent. This optimization method allows to increase the uptime of production wells, which reduces the cost of repair work and increases the production level, since the wells are in working condition for a longer period.

Simulation of an adjustable synchronous electric motor drive of a pumping unit in a reservoir pressure maintenance system

The paper describes the method of controlling water supply while maintaining reservoir pressure via changing the speed of rotation of a pumping unit synchronous electric motor drive. The paper presents a review of existing frequency converters, specifying their advantages and disadvantages. The selection of a cascade semiconductor frequency converter is substantiated. A detailed description of the computer model of an adjustable drive system based on a high-voltage synchronous electric motor drive and the selected frequency converter is also presented. The results of modeling in the form of graphs of transients allow us to conclude about the adequacy of the model and the possibility of its practical use in the study of transient modes of controlled electric pumping units based on synchronous motors.

Analysis of the influence of drydock main pumps drive on electric network

The influence of unadjustable-speed AC drive and adjustable-speed DC drive of the drydock main pumps on the network of the Okean shipyard (Ukraine) is investigated in MatLab SimPowerSystems. To accurately simulate deep-bar induction motors, the own method of determining the parameters of the T-shaped equivalent circuit and viscous friction coefficient of a virtual motor according to catalog data is used. This method is based on formulas that correspond to the T-shaped and refined L-shaped equivalent circuit. It is proposed to introduce the corrected values of the initial starting and critical torque ratio into the calculation. The rated power factor is determined indirectly and compared with the catalog value. The dependences of rotor resistance are approximated by elementary functions, which provide almost constant values of these parameters at subcritical slip values. As a result of the simulation, it became clear that even with the alternate starting of unregulated electric pump units, there is a significant voltage drop in the network. The mathematical model of DC drives was built with a common dual-circuit automatic speed control system. A resonance filter is included at the input of each synchronized 6-pulse generator, thereby eliminating possible errors in operation. The simulation results prove that during the operation of DC drives, there are switching voltage variations in the network, substantially non-sinusoidal current consumption and reactive power consumption. Given the stray capacitance of the cable line, high-frequency voltage fluctuations occur, which are dangerous for electric equipment. Through the use of the harmonic filtering and reactive power control device, these negative phenomena can be eliminated, thus, the DC drive will surpass unadjustable-speed induction motor drive in many respects. To minimize reactive power consumption, an automatic control system with an integrated variable gain reactor power controller can be used

Research of the possibility of using thermoelectric elements (TEE) in wells with low geothermal gradient

The object of research is wells with a low temperature gradient of less than 2–2.5 °С per 100 m (regions of Tataria, Bashkiria, Udmurtia, etc.). In studying the layout of a device for utilizing geothermal energy, a system analysis method was used. And in the course of the study of the sucker rod pumping unit (SRPU) and the electric centrifugal pumping unit (ECPU), the comparative analysis method is used.The paper discusses the possibility of energy savings in the exploitation of oil fields located in regions with low geothermal potential of development facilities. A method for solving the problem is considered as an option for the integrated use of not only the petrothermal energy of the subsoil, but also the hydrokinetic energy of the formation water. It is shown that the utilization of low-temperature geothermal energy due to its combination with the utilization of the hydrokinetic energy of the water pumped through the RPM system (maintaining reservoir pressure) is economically beneficial. This is due to the fact that the method proposed in the work has a number of features, in particular, production (reactive) wells are equipped at the wellhead with thermoelectric generators that convert the thermal energy of the formation fluid into electrical energy. The use of such devices will reduce the cost of electricity to power the electric drive DPE (deep pumping equipment) and other consumers of electricity in the well. Electricity generated by thermoelectric DC modules is summed from all thermoelectric converters. The received energy is sent along the line to the power supply system of the ACS-TP (automated process control system). Thanks to this, it is possible to obtain electrical energy from low temperature wells. Compared with similar known classical methods, when the gas factor of the produced products is sufficiently high (³80–100 m3/t), the use of associated gas is used to power electric gas and turbine generators that generate power for DPE directly at the production well. However, this method of utilization of associated gas at a late stage of development is not economically feasible, since in this case it is extremely low for its implementation.

ЭКСПЕРИМЕНТАЛЬНЫЕ ИССЛЕДОВАНИЯ РАБОТЫ ПНЕВМОПРУЖИННОГО КОМПЕНСАТОРА ДАВЛЕНИЯ С КВАЗИНУЛЕВОЙ ЖЕСТКОСТЬЮ

Актуальность исследования обусловлена воздействием вибрации на элементы установки погружного электроцентробежного насоса. Наличие вибрационных процессов увеличивает количество преждевременных отказов узлов установки. Одной из причин проявления вибрационного воздействия на электроцентробежную насосную установку являются перепады давления на выкиде погружного электроцентробежного насоса, при этом частоты таких перепадов невелики. Цель: разработка лабораторной установки, которая имитирует колебательные процессы, происходящие на выкидной линии электроцентробежного погружного насоса в нефтяной добывающей скважине. Объекты: модель пневмопружинного компенсатора давления с квазинулевой жесткостью, конструктивно представляющего собой пневматическую пружину, внутри которой расположен пакет из пяти последовательно установленных тарельчатых пружин. Методы: численные решения дифференциальных уравнений, теория колебаний, математический анализ, математическая статистика, методы математического моделирования. Результаты. Разработана лабораторная установка, позволяющая провести исследования модели пневмопружинного компенсатора давления с квазинулевой жесткостью, конструктивно представляющего собой пневматическую пружину, внутри которой расположен пакет из пяти последовательно установленных тарельчатых пружин. Система с квазинулевой жесткостью представляет собой совокупность пневмопружины, имеющей силовую характеристику с рабочим участком положительной жесткости, и пакета последовательно соединенных тарельчатых пружин, имеющего силовую характеристику с рабочим участком отрицательной жесткости. Экспериментально подобраны параметры тарельчатых пружин таким образом, чтобы получить силовую характеристику с участком квазинулевой жесткости при заданном давлении. Результатом исследований на лабораторном стенде стало совпадение с заданной погрешностью замеров размаха колебаний и теоретически предсказанных результатов, что позволило доказать правильность теоретических выводов.

IMPROVING THE CENTRIFUGAL PUMP DESIGN AND CHANGING THE STRENGTH OF OPERATION

Background Currently, the share of electric centrifugal pump (EСP) units, which operate in a periodic mode, is growing in the production structure at a marginal fund. In this mode, the pump flow varies from the maximum value at the beginning to the minimum at the end of the pumping period. The trend towards such dynamics is explained by the fact that the fund of low-yield wells is growing in Western Siberia, where EСP is the main mechanized method of production. When oil is being produced in marginal wells, it is often necessary to encounter such a problem, when the dynamic level of the gas-liquid mixture can drop to a critical level. In this case, the pump flow is reduced, and the pressure developed by the pump is insufficient to overcome the hydrostatic pressure of the liquid column in the tubing. In this case, the pump stops pumping fluid and an inevitable failure of the pumping unit occurs due to a motor burnout. In addition, an increase in EСP operating in automatic periodic switching on mode leads to a significant reduction in well production. Aims and Objectives The aim of the work is to introduce a device for stabilizing the pressure at the inlet to the EСP station, which would discharge part of the oil product back to the pump through the annulus without stopping the equipment. In order to ensure reliable operation of this structure, the material was tested for strength and durability, taking into account the redistribution of stresses and changes in properties during operation. Results The tests of samples from pipe fragments of steel 40X with a service life of 57, 378, 1035 days showed a decrease in the tensile strength and yield strength by 20 % and 6 %, respectively. The distribution of hardness over the cross section of the wall of the tested pipe fragments showed that the core is harder than the edges of the wall, while as the operation progresses there is a slight hardening. Impact test results showed a significant reduction in toughness by 73 %. Fatigue tests carried out according to the circular curvature with rotation, revealed a decrease in fatigue life. The analysis of the device for stabilizing the pressure at the inlet to the ESP revealed that the most loaded unit is the overlap mechanism, which forms the hydraulic channel between the tubing cavity and the annular space. The calculation the action of the axial compressive load and the internal pressure of this node showed that the resulting loads in the stress concentration zones do not exceed the allowable values.

Development of models for recognition of technological situations in the operation of electric centrifugal pumps for oil production

The article deals with the problem of constructing models for automation of the technological situations recognition procedure during operation of oil wells. An approach was suggested to recognize technological situations associated with the operation of electrical centrifugal pumping units in oil production. The paper describes the methods for constructing models intended to recognize technological situations characterizing different types of failures of such electric centrifugal pumping (ECP) units. The models based on artificial neural networks, classification trees and support vector machines were considered as separate methods for constructing models for recognizing the technical state of ECP units in oil production. The paper presents the results of studying such methods in the tasks of assessing the technical state of several types of oil and gas production equipment. It is proposed to use sets of models enabling to integrate solutions of individual recognizers to improve situation recognition reliability. In the course of the research, tests were carried out on real operational data of ECP units. The research results showed that the use of such complex models will ensure a sufficiently high accuracy of recognition of technological situations. The proposed complex models provide higher stability of the results, which is confirmed by the results of statistical analysis of solutions obtained in the course of numerical experiments. Thus, it is shown that the proposed complex models for recognition of technological situations are an effective option to be used in object control systems during operation of oil producing wells.

Features of an Asynchronous Motor with a Double-Layer Rotor in Ship Pumping Equipment

This article examines the characteristics and structure an asynchronous motor with a double-layer rotor for ship electric pumping units, as well as approaches to studying it. The main technical requirement for such motors is a low level of noise emission when providing the required heat removal from the operating motor. The use of an external double-layer rotor in this motor makes it possible to significantly improve its working and maintenance characteristics.

SOME FEATURES OF THE WELLS OPERATION AT WHITE TIGER OIL FIELD DURING TRANSITION FROM GAS-LIFT TO MECHANIZED METHOD OF OIL PRODUCTION BY ELECTRIC CENTRIFUGAL PUMPS UNITS

Background The paper discusses the experience of transition from gas-lift to mechanized method of oil production by electric centrifugal pumps units. Aims and Objectives Analysis of the wells operation at White Tiger oil field after the transition from the gas-lift method of oil production to the mechanized one using the electric centrifugal pumps. Results The authors concluded that the significant possibilities of forced sampling with electric centrifugal pump units resulted in an increase in fluid flow rate from an average of 125 to 680 m3 / d. To solve the issue of the forced sampling effect on the process of replacing productive oil intervals with water, it was proposed to continue electrocentrifugal pumps implementation at high-watered wells at White Tiger oil field. It is recommended to equip wells with electric centrifugal pumps with gas-powered mandrels for possible gas-lift operation for the period of pump inoperability and in some other cases (during start-up, pulling, load reduction).

Operating Characteristics of a Cylindrical Linear Induction Motor

This article proposes calculating a cylindrical linear electric motor (CLEM) by the finite element method. The use of an electric drive on the basis of the CLEM allows one to build a submersible, electric pump unit. For this, the secondary element is connected with the pump plunger. The unit is lowered into a well in the oil extraction zone. The three-phase winding of the CLEM inductor is connected to the voltage source by means of a flat reinforced cable. An electronic commutator located at the surface near the wellhead is used as the power source. With the use of an electronic commutator, the supply voltage frequency is regulated and the motor reversal is implemented so that its secondary element can perform reciprocating motion. The operating characteristics of the cylindrical linear electronic motor obtained from calculations for an idealized model of the motor in the cylindrical coordinate system by the finite element method are presented. These calculations were performed with the use of the ANSYS Maxwell program. The CLEM operating characteristics were calculated for different supply voltage frequencies. Calculated values of the pulling force are compared with the experimental values. Calculations in the ANSYS Maxwell program yield highly accurate pulling force values. It is shown that an increase in the supply voltage frequency leads to an increase in the motor efficiency coefficient.

APPLICATION OF SOLVENT SONPAR-5402 AGAINST ASPHALTIC RESINOUS PARAFFINE SEDIMENTS AT URSHAK OIL FIELD

The basic source for solvents search is the information on asphaltic resin- ous paraffine sediments (ARPS) composition, which is a complex mixture of paraffin hydrocarbons with a predominant content of asphaltic resinous substances, mechanical impurities and water, depending on the geological and physical conditions in the formation system and the nature of the oil itself. It is known that it is necessary to use aromatic hydrocarbons and high-molecular compounds to dissolve asphaltenes and resins. At Urshak and other fields of the Republic of Bashkortostan, the ARPS solvent SONPAR-5402 was tested, the composition of which was developed at Neftekhim Experimental Plant ZAO, Bashneft ANC. To evaluate the sol- vent SONPAR-5402 performance compared to other solvents commonly used at Urshak field, ARPS samples were subjected to impact of SONPAR-5402 and other solvents: SNPKh-7870, MIA-prom and Nefras AR-120/200. Comparing the ARPS dissolution efficiency (maximum per- centage of solvent dissolution), SONPAR-5402 is in the first place. In 2016 at Urshak field SONPAR-5402 was used in 21 wells, including 18 wells with sucker-rod pumping unit and 3 wells with electric centrifugal pump units. The results of solvent SONPAR-5402 field tests showed that the efficiency of the developed solvent in the producing wells of the Urshak field is high and makes more than 80 %, and sometimes reaches 100 %.

К вопросу прогнозирования отложения солей в установках электроцентробежных насосов

К вопросу прогнозирования отложения солей в установках электроцентробежных насосов

Интеллектуализация скважин, оснащенных установками электроцентробежных насосов

Интеллектуализация скважин, оснащенных установками электроцентробежных насосов

Operational Capability of an Electric Pump Unit with New and Worn Rotor Wheels

This article is devoted to experimental studies of the operational capability of an electric pump unit in operation with new and worn out rotor wheels. Results of measurements are presented for the operating parameters of the electric pump unit, vibration monitoring, and thermal imaging, and the calculation of static durability of a shaft, based on which the main conclusions are formulated.

Modeling of an ammonia–water absorption heat pump water heater for residential applications

An investigation of a direct gas-fired single-effect ammonia–water absorption heat pump water heater for residential applications is presented. Combustion of natural gas provides heat to the desorber where refrigerant is generated. The absorber and condenser are hydronically coupled in parallel to a hot water storage tank, while the evaporator is hydronically coupled to an ambient air heat exchanger that extracts ambient heat. A thermodynamic model is developed and the system configuration is optimized to provide a baseline heating capacity of 2.79 kW at a coefficient of performance of 1.74. A detailed parametric study over a range of water and ambient temperatures is used to understand the variation in system performance as the water is heated from 14.5 to a minimum of 57.0 °C. The performance of the heat pump coupled to a 227-liter storage tank is also modeled for three different scenarios, a cold start response to a 76-liter draw, and response to stand-by losses. The absorption heat pump water heater is found to achieve coefficients of performance better than those of commercially available gas fired heaters and electric heat pump units.

Наблюдатель угловой скорости ротора асинхронных приводов электроцентробежных насосных установок

Наблюдатель угловой скорости ротора асинхронных приводов электроцентробежных насосных установок

Load on Multipair Contact Zones of Operating Parts of Screw Pumps and Motors: A Computer Analysis

It is most reasonable to use electric screw pumping units (SPU) for oil production in harsh environments. For efficient operation of SPU the authors propose to insert the original reducer on the base of flat-conic precession transmission so as to ensure efficient SPU operation. However, the falling rotational speed of the pump screw boosts the torque in friction pair of rotor and pump holder. The paper dwells upon the specified computer simulation method for calculating the load on multipair contact zones of operating parts of the screw pump and screw down-hole motors. This method allows to determine the maximum permissible diametrical tightness of worn-out operating parts, a value at which the tightness of operating chambers (representing the operability of the pump and motor) is no longer guaranteed.

Анализ энергоэффективности электромеханических систем транспорта газа

Systematic national and international experience in the design and implementation of modern systems of automated electric drive of technological equipment of gas pipelines. Considered the most important factors for improving the competitiveness of Electromechanical systems megawatt class for centrifugal natural gas compressors. The results of numerical analysis and experimental operation of new units at compressor stations of main gas pipelines. The possibility of application of new high-voltage multilevel inverters, soft start devices, microprocessor systems control and diagnostics of Electromechanical parts of electric drives based on induction and synchronous machines. Suggested promising directions modernization and improvement of electric pumping units on the basis of use of new techniques and technologies to improve the reliability, sustainability and energy efficiency of compressor stations on gas pipelines of the Russian Federation.