Deep-well Pumps Research Articles

Утечка жидкости в скважинном штанговом насосе

Утечка жидкости в скважинном штанговом насосе

Position-Binary Technology for Processing the Signals of a Load for Identification of the Technical State of Deep-Well Sucker-Rod Pumps

A position-binary technology for processing the signals of a load caused by the weight of a rod string on the suspension of a sucker-rod pumping unit is proposed. The method may be employed for identification of the technical state of deep-well sucker-rod units. An algorithm for identification of the technical state of the unit is developed. An implementation of the new algorithm on an actual facility with the use of a remote system confirms the increased reliability of automated diagnostics.

Analysis of working behavior of Jinping-I Arch Dam during initial impoundment

To study the stress, deformation, and seepage pressure during the initial impoundment of the Jinping-I Arch Dam, monitoring analysis and numerical calculation were used in a dam behavior analysis that focused on the working behavior of the dam during the late period of the initial impoundment up to the end of November 2014. The numerical calculation was performed based on feedback analysis of the deformation and stress of the arch dam through inversion of the elastic moduli (E) of the dam body and foundation, using a three-dimensional finite element model for the linear elastic material of the arch dam. The main monitoring indices presented insignificant changes in the late period of the initial impoundment, and the results of feedback analysis were consistent with monitoring results. Analysis results also show that the deformations of the dam body and dam foundation were within the design range; the dam stress distributions were normal, with values lower than the design control criteria; and the seepage flows through the dam body and dam foundation were lower than the design drainage capacity of the deep-well pump house, demonstrating that the Jinping-I Arch Dam was in good working condition, and the initial impoundment had been successfully completed. The results of the working behavior analysis of the Jinping-I hydropower project during the initial impoundment can provide references for safe operation of similar projects.

Dynamic Programming Approach in the Optimization of Tool Life in Turning Process of Duplex Stainless Steel DSS

The paper presents the application of dynamic programming for optimization of cutting parameters of Duplex Stainless Steels (DSS). In this work, modified Dijkstra's optimization algorithm is used in order to obtain the optimal values of the technological cutting parameters with coated carbide tool point. ANOVA analysis was performed to determine the significance of machining parameters. The results at optimum cutting condition are predicted using estimated values. The study was performed within a production facility during the machining of electric motor parts and deep-well pumps.

Taguchi Design of Experiment in the Optimization of Tool Life in Turning Process of Duplex Stainless Steel DSS

The paper presents the contribution in methodology of production processes of difficulty to cut materials particularly in optimization method of Duplex Stainless Steels (DSS). In this work, Design of Experiment (DOE) is used to examine turning experimental data. The DOE, based on the Taguchi method with orthogonal array L9 and signal-to-noise ratio are used. The optimal values of the technological cutting parameters with coated carbide tool point are searched. ANOVA analysis was performed to determine the signification of machining parameters. The significance of various cutting parameters on tool life have been proven. The results at optimum cutting condition are predicted using estimated values. The study was performed within a production facility during the machining of electric motor parts and deep-well pumps.

Development of the sealing method of the pump clearance by well production

The paper deals with the issues of creating sealing systems in process equipment. The problem of leakage through the clearance of the plunger-cylinder pair of the deep-well pump is considered, and well production is used as a sealing medium. To implement the specified sealing system, the fluid-fracture effect, developed by R. S. Gurbanov and M.A. Mamedova is used. The fluid-fracture effect at certain critical values of fracture opening leads to changes in the rheological properties of the well production, which allows to identify the pumps with the necessary clearances for the production to work as a seal. The developed method allows to reduce the delivery rate of the pump and decrease the cost of pumps used in a single well.

An economic analysis of role of technology in sustaining water resources for enhanced agricultural production

Sugar producing regions in India have more than 80 percentage groundwater irrigation through deep-well pumping. Whereas, NASA's gravity recovery and climate experiment satellites have revealed faster depletion of groundwater stocks in India. These areas are cultivating 93 percentage of sugarcane. This research is a comparative study and has attempted to estimate the economic value of irrigation water and the benefits of water and energy that can be saved through adoption of improved irrigation technologies. The economic value of each ha. cm of irrigation water for sugarcane was also worked out. Including additional area under irrigation with the water saved should be recommended only in safe and semi-critical regions to prevent 'rebound' effect.

Inquisition of Flow through Splittered Blade Impellers in Deepwell Pumps using Computational Fluid Dynamics

Inquisition of Flow through Splittered Blade Impellers in Deepwell Pumps using Computational Fluid Dynamics

Influence of Technological Cutting Parameters on Surface Texture of Austenitic Stainless Steel

The paper presents the contribution in engineering of surfaces particularly in surface texture of Austenitic Stainless Steels. The objective of the investigation was to determine the surface texture of austenitic stainless steel after turning with coated carbide tool point. The investigation included geometrical parameters of Surface Integrity for different technological cutting parameters in dry turning process of austenitic stainless steel. The article presents the surface roughness parameters with the roughness profiles (irregular slopes). The percentage of isotropic surfaces and Bearing Area of ​​Primary Model. Analyses were performed for variable cutting parameters. An Infinite Focus Measurement Machine (IFM) was used for the surface texture analysis. The study was performed within a production facility during the machining of electric motor parts and deep-well pumps.

Influence of Cutting Parameters on Surface Morphology of Austenitic Stainless Steel after Turning

The study presents the contribution in engineering of surfaces particularly in surface morphology of Austenitic Stainless Steels. The objective of the investigation was to determine the surface morphology of austenitic stainless steel after turning with coated carbide tool point. The investigation included geometrical parameters of SI for different cutting parameters in dry turning process of austenitic stainless steel. The study has been performed within a production facility during the production of electric motor parts and deep-well pumps.

Prospects for the Use of the Bolshebanny Geothermal Field Reserves to Generate Electricity and Heat

The possibility of developing the Bolshebanny geothermal field explored in the 1960s is discussed in view of the current state of the art in the geothermal technologies. It is proposed to exploit production wells by forced pumping with deep-well pumps and suppressing boiling. This raises the issue of constructing a 14 MW binary power plant with variable capacity.

Hybrid Method of Dynamograms Wavelet Analysis for Oil-Production Equipment State Identification

In the paper we considered a hybrid method of dynamograms wavelet analysis, applied for oil-production equipment work mode identification. Neural network architecture for sucker-rod deep-well pump units malfunctions detection is proposed. The architecture of intellectual data recognition system applied for pump installation control is presented.

NUMERICAL CALCULATION AND EXPERIMENTAL STUDY OF AXIAL FORCE IN A DEEP-WELL CENTRIFUGAL PUMP

In the operation process of centrifugal pumps, especially in multi-stage pumps, axial force is one of the main factors which affect the pump safety and reliability. This paper presents the axial force study in a deep-well centrifugal pump (DCP) with theoretical calculation, numerical simulation and experimental measure. Three different calculation formulas were respectively introduced and used in the model pump. The calculated results were compared and analyzed with the numerical simulation values and experimental results, and the detailed numerical simulation methods and experimental configuration were explained. Finally, the more accurate formula for calculating the axial force in oblique flow centrifugal impeller was selected out. At the rated flow point, the deviation of the axial force obtained by numerical simulation and the experimental value is approximately 3.8%, and the calculated result of selected formula only less than the experimental results of 2.6%. The results provide a theoretical basis for the axial force calculation in the centrifugal impeller design process.

Experimental Analysis by Measurement of Surface Roughness Variations in Turning Process of Duplex Stainless Steel

Abstract The objective of the investigation was to identify surface roughness after turning with wedges of coated sintered carbide. The investigation included predic ting the average surface roughness in the dry machining of Duplex Stainless Steel (DSS) and the determination of load curves together with roughness profiles for various cutting conditions. The load curves and roughness profiles for various cutting wedges and variable cutting parameters were compared. It has been shown that dry cutting leads to a decrease in friction for lubricated surfaces, providing a small initial contact area where the surface is contacted. The st udy has been performed within a production facility during the production of electric motor parts and deep-well pumps. Keywords: turning, coatings, friction-reducing, optical microscopy, surface roughness analysis and models. © 2014 Polish Academy of Sciences. All rights reserved 1. Introduction Engineering surfaces, particularly those generated using multi-step manufacturing processes and intended for tribological applications such as bearings and gears, rarely if ever have perfectly normal distributed elevations [1]. Surface roughness measurements of any workpiece are among the most important ones in length and angle metrology, both in theory and practice. According to Wieczorowski et al. [2], there are great discrepancies in these measurements because of the large variety of instruments for surface roughness analysis. Hence, three-dimensional surface topography parameters are necessary for assessing the surface roughness characteristics more effectively [3]. According to Mahovic Poljacek et al. [4], a precise characterization of roughness and surface topography is of prime importance in many engineering industries because certain functional properties of the materials are often determined by the surface structure and characteristics. Estimation of the magnitude of surface roughness under the given cutting conditions resulting from metal removal operations is one of the major goals in this area [5, 6]. According to Benardos and Vosniakos [7], surface roughness is a widely used index of product quality and in most cases a technical requirement for mechanical products. Achieving the desired surface quality is of great importance for the functional behaviour of a part. Surface profilometry is for many years a well-known method of topography inspection [8–12]. Topography parameters represent surface properties is much better than 2D ones. Using the surface parameters can be determined functions describing surface behaviour. The workpiece material is duplex stainless steel because this stainless steel is widely used for many industrial applications due to its unique properties. Cabrera et al. [13] and Park et al. [14] consider that the good combination of their mechanical properties (high strength and toughness) and corrosion resistance makes them of great interest for a wide range of

Microhardness and Surface Integrity in Turning Process of Duplex Stainless Steel (DSS) for Different Cutting Conditions

The objective of the investigation was to identify microhardness of surface integrity (SI) after turning with wedges of coated sintered carbide. SI is important in determining corrosion resistance, and also in fatigue crack initiation. The investigation included microhardness analyses in dry and wet machining of duplex stainless steel. The microhardness of SI for various cutting speeds was compared. It has been shown that wet cutting leads to the decrease of SI hardening depth, while increasing the rounded cutting edge radius of the wedge increases the maximum microhardness values and the hardening depth. An infinite focus measurement machine has been used for the rounded cutting edge radius analysis. The study has been performed within a production facility during the production of electric motor parts and deep-well pumps as well as explosively cladded sheets.

Numerical simulation and uncertainty estimation in a deep-well centrifugal pump

One stage deep-well centrifugal pump section is investigated numerically in this study. Three-dimensional steady Reynolds-Averaged Navier–Stokes (RANS) equations are solved on high-quality fine structured grids in conjunction with the shear stress transport (SST) k-ω turbulence model by employing the CFD (computational fluid dynamics) software ANSYS-Fluent 13.0. A detailed grid sensitivity analysis was carried out to analyse the influence of grid elements number. The discretization errors were calculated specifically through the Richardson extrapolation theory. The uncertainty of fine gird for the simulation in this paper was estimated as 1.23%. The prototype experimental test results were acquired and compared with the data predicted from the numerical simulation, which showed that there is a good agreement between two methods.

Development and test of a plastic deep-well pump

To develop a plastic deep-well pump, three methods are proposed on structural and forming technique. First, the major hydraulic components are constructed by plastics, and the connection component is constructed by steel. Thus the pump structure is more concise and slim, greatly reducing its weight and easing its transportation, installation, and maintenance. Second, the impeller is designed by maximum diameter method. Using same pump casing, the stage head is greatly increased. Third, a sealing is formed by impeller front end face and steel end face, and two slots are designed on the impeller front end face, thus when the two end faces approach, a lubricating pair is formed, leading to an effective sealing. With above methods, the pump's axial length is greatly reduced, and its stage head is larger and more efficient. Especially, the pump's axial force is effectively balanced. To examine the above proposals, a prototype pump is constructed, and its testing results show that the pump efficiency exceeds the national standard by 6%, and the stage head is improved by 41%, meanwhile, its structure is more concise and ease of transportation. Development of this pump would provide useful experiences for further popularity of plastic deep-well pumps.

The Machinability of Duplex Stainless Steel - Solutions in Practice

In production practice, it is important to know the machinability of new constructional materials. This is related to the selection of adequate cutting tools and machining conditions. One of such relatively new materials is Duplex Stainless Steel (DSS). Manufacturing machine parts of hard-to-machine material is very troublesome. It is still more difficult when high quality requirements are to be met. Duplex stainless steel is used in applications for very severe working conditions, e.g. for modern deep-well pump bodies for mining industry or the shafts of electric mixer motors in food industry. This paper discusses the effect of cutting conditions on the machinability of DSS. The advantages and disadvantages of various tool materials with regard to machining of DSS are highlighted. Problems associated with the machining of DSS as well as tool wear and the mechanisms responsible for tool failure are identified and discussed. However, the machinability of DSS is an area that needs to be studied more deeply to cut the production cost.

Analysis of Efficiency of Methods for Improving Sucker-Rod Deep-Well Pump Plungers and Choice of an Alternative Method

Analysis is provided for electrolytic chromizing and flame spraying used for strengthening plungers in the manufacture of sucker-rod deep-well pumps. The main disadvantages of these strengthening methods are indicated. A new method is proposed for strengthening plungers using cold electrolytic iron plating. Operation of test specimens of sucker-rod well pumps under industrial conditions, fitted with plungers strengthened by cold iron plating, demonstrate an advantage over chromizing and flame spraying. An increase in operating life by a factor of 1.2–1.3 is established.

Numerical and Experimental Study of Axial Force and Hydraulic Performance in a Deep-Well Centrifugal Pump With Different Impeller Rear Shroud Radius

A multistage deep-well centrifugal pump (DCP) with different impeller rear shroud radius have been investigated both numerically and experimentally under multiconditons, which aims at studying the influence of impeller rear shroud radius to the axial force and pump hydraulic performance. During this study, a two-stage DCP equipped with three different impellers was simulated employing the commercial computational fluid dynamics (CFD) software ANYSY-Fluent to solve the Navier-Stokes equations for three-dimensional steady flow. High-quality structured grids were meshed on the whole computational domain. Test results were acquired by prototype experiments, and then compared with the predicted pump performance and axial force. The static pressure distribution in the pump passage obtained by numerical simulation was analyzed. The results indicated that the appropriate impeller rear shroud radius could improve the pump performance and lower the axial force significantly.