Centrifugal Pump Units Research Articles

To the issue of energy efficiency of using frequency-controlled centrifugal pump units

The expediency of using a variable frequency drive for pumping units was repeatedly proved both from the point of view of the economic component and the technological one. However, the construction of automatic control systems for the operating parameters of pumping stations is mainly based on maintaining the pressure setpoint and does not include monitoring the efficiency of the aggregates working in the group and, the more so, its regulation. In this paper, an algorithm is developed for the energy efficient management of centrifugal pump units, which allows not only maintaining the pressure setpoint, but also optimizing their efficiency.

Анализ эффективности применения сепараторов песка для защиты установок электроцентробежных насосов в скважинах Самотлорского месторождения

Анализ эффективности применения сепараторов песка для защиты установок электроцентробежных насосов в скважинах Самотлорского месторождения

Наблюдатель угловой скорости ротора асинхронных приводов электроцентробежных насосных установок

Наблюдатель угловой скорости ротора асинхронных приводов электроцентробежных насосных установок

Development and exploitation features of methane-coal wells using downhole pumping equipment

In this article extraction of methane from coal beds is presented. The article presents results of the study of downhole pumping equipment used in the exploitation of coal bed methane wells. The features of various types of equipment such as piston sucker-rod pumping units, electrical centrifugal pumping units and sucker-rod screw pumping units have been considered. The results show benefits of sucker-rod screw pumping units because of their versatility and resistance to higher content of mechanical impurities.

STATE, CHALLENGES AND PROSPECTS OF DEVELOPMENT OF THE METHOD FOR SIMULTANEOUS-SEPARATE OPERATION OF WELLS USING ECP UNITS IN THE MULTIHORIZON FIELDS OF WEST SIBERIA

To create the operable equipment for simultaneous-separate operation of wells by electrical centrifugal pumping units (“SSO-ECP”) the experience gained by domestic and foreign specialists in this equipment designing, manufacturing and introduction was studied. It is offered to experimentally apply the assembly of SSO-ECP -A unit in wells being in operation for development of multihorizon fields with the purpose to increase these horizons oil recovery factor and current flow rates of wells. It is shown that for perspective development of SSO-ECP it is necessary to speed up the designing process and to arrange the commercial production of automated well systems of flow rate control and water encroachment of layers separated in the borehole, well chokes, and to prepare the industry «Methodical recommendations for designing the SSO technologies in multihorizon oil fields of Russia».

DOWNHOLE REACTIVE POWER COMPENSATION

The authors provide a method for compensation of the reactive power inside a well. In the environment Matlab/ Simylink a model was developed of the site of the electrical centrifugal pump unit power supply from the transformer substation. A comparison is made of the proposed method of downhole reactive power compensation with the existing method.

Existing Perspectives of Rotodynamic Pumps Rotation Speed Increase

Perspectives of high-speed centrifugal pump units are regarded, besides the main problems of rotation speed increase and their solution methods are studied in this paper.

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.

Developing Digital Control System Centrifugal Pumping Unit

Currently, the leading Russian oil companies engaged in the development of automatic control systems (ACS) oil equipment, to improve its efficiency. As an example of an object needed to optimize its work, a centrifugal pumping unit (CPU) can be specified. Frequency actuators provide an opportunity to run CPU in any algorithm, and many industrial controllers, are part of the automatic control system technological process (ACSTP), allow optimizing the operation of the centrifugal pumping unit and help determine the requirements for the development of digital automatic control system for CPU. The development of digital automatic control systems for such a complex nonlinear control object like CPU has several features that should be considered when designing control systems for that object.

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.

Design concept of a pump stage with replaceable hydraulic components and prediction of its performance curves

In many cases, centrifugal pump units are expected to deliver the required performance under varying operating conditions. In particular, the pumps for oil extraction and transportation should deliver a constant head, although their capacity often changes during the life cycle. In order to keep the efficiency at a high level and not to replace a whole pump, the authors suggest to replace in such cases only hydraulic components of the pump (impellers and stationary sections of diffuser channels) that are to be installed in the same casing. The paper describes an approach for designing of radial-flow impellers and sections of diffuser channels to be used as replaceable. It allows for delivering a required head and providing a high efficiency in a wide range of capacities. The components intended for smaller capacities are featured with narrower flow passages. However, the dimensions of replaceable components are the same. The paper describes also a numerical simulation of fluid flow in a pump stage with two sets of replaceable radial-flow impellers and sections of diffuser channels. The CFD software used in this research is ANSYS CFX 11. Good correspondence of results is observed. Difference in flow pattern at various capacities and its influence on the performance curves delivered with replaceable components is demonstrated. Basing on the obtained results, the analysis of energy losses is presented.

Procedures and practice for raising reliability of dynamic equipment

are a challenging task whose accomplishment requires consideration of all factors that assure trouble-free operation. Leading enterprises absolutely justifiably pay constant attention to development of diagnostic systems, refinement of methods, and enhancement of quality of technical services. However, it must be remembered that the base level of reliability of the unit underlying its design constantly falls in the operational process. In view of aging of the dynamic equipment park and growing cost of new equipment, its upgrading, which makes it possible to raise at a relatively small cost the reliability and efficiency indices through use of state-of-the-art units designed by using advanced technical solutions that ensure a qualitatively new level of the unit, is becoming increasingly urgent. At present, more than a hundred units of equipment upgraded by OOO TRIZ are in use in various enterprises of Ukraine, Russia, and Belarus. These are dynamically loaded centrifugal compressor and pump units, turbines, generators, and electric motors. For example, the compressor unit K-104 has been upgraded in all Ukrainian enterprises of the nitrogen industry without exception. Use of engineering solutions offered by OOO TRIZ for dynamic equipment of the petrochemical industry does not require high initial investment and fully guarantees: • decrease of emergency shutdowns; • increase of time between servicing cycles; • enhancement of efficiency; • lowering of vibration level by 1.5–3 times; • curtailment of operational cost; • lengthening of service life; • payback period not more than one year; • operational warranty period 24 months. Practical experience of operation of the upgraded units MTV 2-5, ATKP 435/1600, 340-81-4, 43VTs 160/9, and 4RSA-32 (made by the company UkrTATNAFTA in Kremenchug), and 5 VR (made by the company Galichina in Drogobych), the first ones of which underwent upgrading in 1995, confirms the above-listed factors. For 12 years TRIZ, in order to enhance the reliability of rotor machines, has been using radial bearings with self-adjusting bushings (bearing shells) on a hydrostatic suspension. More than 80 units with a rotor speed ranging from 1500 to 24,000 rpm and a shaft neck diameter ranging from 40 to 300 mm are being successfully operated with PDO-type bearChemical and Petroleum Engineering, Vol. 39, Nos. 1–2, 2003

Experience with the operation and repair of elecrically driven centrifugal pumping units in the central base for production maintenance, scientific-production union of the “Yuganskneftegaz” Joint Stock Company

Experience with the operation and repair of elecrically driven centrifugal pumping units in the central base for production maintenance, scientific-production union of the “Yuganskneftegaz” Joint Stock Company

Operation and repair of electrically driven centrifugal pumping units in the Tatneft' Joint Stock Comapany

Operation and repair of electrically driven centrifugal pumping units in the Tatneft' Joint Stock Comapany

Use of foreign technology in the testing, repair, and reconditioning of electrically driven centrifugal pumping units

Use of foreign technology in the testing, repair, and reconditioning of electrically driven centrifugal pumping units

Technique: Arteriorarterial Bypass For Renal Transplant Protection During Abdominal Aortic Aneurysmectomy Using a Centrifugal Pump and Limited Heparinization

Today, renal transplant patients have increasing longterm success rates. Since the arteriosclerotic disease plaguing the renal patient seems to be more intensified after hemodialysis, expectations are that greater numbers of renal transplant patients with aortic disease will be seen. When clamping of the aorta occurrs during aneurysmectomy, perfusion of the transplanted kidney is compromised. A Bio-Medicus [a] centrifugal pump was utilized in the repair of an abdominal aortic aneurysm to protect the transplanted renal graft. The bypass consisted of cannulated sites of the left axillary artery and the left femoral artery with the centrifugal pump unit interposed. The resulting bypass was considered to be an “in situ” perfusion of the kidney. A small amount of heparin was given. The transplanted kidney excreted urine the entire procedure; the creatinine levels remained stable, and the patient did well. Successful use of this simple yet effective arterioarterial bypass lends itself to greater use in the future (J. Extra-Corpor. Technol., 21(2): 61-64, 1989, 11 Ref).

The Selection and Operation of Centrifugal Pumps

Centrifugal pumping units, particularly electric motor driven, used largely by smaller cities and towns, are unique in that the annual cost of power for their operation nearly always exceeds the first cost of the pump and motor. Frequently, it is two or more times the cost of the pumping equipment. For example, the power cost of pumping one million gallons of water per day against a head of 200 feet with electric current averaging 1^ cents per kilowatt hour, will be approximately $5,250.00 per year, and the cost of pump and motor, assuming this to have a capacity of two million gallons daily, will be less than $2,000.00. This fact should lead to careful consideration, before purchasing, of characteristics and general suitability of the pump and motor to the service to be performed, in order to accomplish the minimum operating cost. For instance, in the example given, each 1 per cent of combined efficiency of pump and motor is worth $80.00 per year, or 10 percent on an investment of $800.00, which sum is more than a third of the entire cost of pump and motor. These figures are not unusual.

One Example of Centrifugal Pumps for Petroleum Transportation

Abstract This paper deals with the problems involved in one specific installation of motor-driven centrifugal pumps for pipe-line work. The author describes conditions prior to the installation, and gives the reasons for the selection of centrifugal pumping units, as well as actual construction and operating costs so far as possible. He also discusses the effect that the experience gained from the installation described may have on the future use of centrifugal pumps in petroleum transportation.

One Example of Centrifugal Pumps for Petroleum Transportation

Abstract This paper deals with the problems involved in one specific installation of motor-driven centrifugal pumps for pipe-line work. The author describes conditions prior to the installation, and gives the reasons for the selection of centrifugal pumping units, as well as actual construction and operating costs so far as possible. He also discusses the effect that the experience gained from the installation described may have on the future use of centrifugal pumps in petroleum transportation.

Closure to Test of A Three-Stage, Direct-Connected, Centrifugal Pumping Unit

Closure to Test of A Three-Stage, Direct-Connected, Centrifugal Pumping Unit