scholarly journals INCREASING THE ENERGY EFFICIENCY OF A PUMP UNIT UNDER PULSE HYDRAULIC FRACTURING BREAKDOWN

2017 ◽  
Vol 254 (4) ◽  
pp. 39-44 ◽  
Author(s):  
A.Sh. Shipulin ◽  
KKS Kupavih ◽  
KAS Kupavih
Keyword(s):  
Energy Efficiency ◽  
Hydraulic Fracturing ◽  
Pump Unit ◽  
Pulse Hydraulic Fracturing

A NUMERICAL INVESTIGATION OF PULSE HYDRAULIC FRACTURING TREATMENTS USING THE X-FEM TECHNIQUE

2019 ◽  
Vol 22 (8) ◽  
pp. 923-938
Author(s):  
Mohammad Vahab ◽  
Zakieh Harif ◽  
Nasser Khalili
Keyword(s):  
Hydraulic Fracturing ◽  
Numerical Investigation ◽  
Pulse Hydraulic Fracturing

Some aspects of improving the energy efficiency of a mine centrifugal pumps.

2020 ◽  
Vol 23 (2) ◽  
pp. 48-51
Author(s):  
V. KONDRATENKO ◽  
◽  
V. KALYNYCHENKO ◽  
Keyword(s):  
Energy Efficiency ◽  
Mine Drainage ◽  
Experimental Studies ◽  
Operating Mode ◽  
Centrifugal Pumps ◽  
Pump Unit ◽  
Drainage Systems ◽  
Start Up ◽  
Discharge Unit ◽  
Pumping Units

Mine drainage systems, which are used at the main drainage of mining enterprises, have a drive capacity of up to 1600kW. To reduce non-productive energy losses, as well as for the continuous operation of the mining company, mine pumps must be energy efficient and reliable. Analysis of downtime of drainage systems shows that the weak point is the unloading device. This fact can lead not only to the failure of the pumping unit, but also to possible prolonged downtime of the mine. The main disadvantage of the existing disk unloading devices of mine pumps is their low reliability and low service life, due to the rapid wear of the components of the unloading unit. The most vulnerable elements of the unloading device are the unloading rings. The need for frequent replacement and adjustment of the elements of the discharge unit is associated with disassembly and assembly of the pump directly in the pump chamber. Such actions require significant costs of unproductive manual labor of service personnel, and rapid wear of parts of the unloading device necessitates their constant replenishment. Malfunctions in the unloading device can cause significant pump failures. To increase the reliability and energy efficiency of mine drainage systems, the method of control of the unloading device was used. During the experimental studies it was found that cavitation phenomena during the operation of pumping units are absent and, accordingly, can not be the cause of wear of the elements of the unloading unit. When the pumps are operating in steady state, the displacement of the rotors was monitored for 3-4 hours on each pump unit. After data processing, it was obtained that the wear of the surface of the unloading rings occurs at a rate of 0.05-0.15mm in one hour. To determine the wear of the rings of unloading during start-up - stop of the pump, at first the indicators of measuring devices at the established mode of operation of the pump unit were fixed. Then the pump was turned off and on again. After starting the pump unit, we made sure that the operating mode of the unloading device did not change and compared the readings of the shaft position indicator before stopping and after starting the pump. From the measurements made it followed that stopping and starting the pump does not lead to noticeable wear of the unloading device. Therefore, it can be assumed that mainly the wear of the discharge rings occurs during the steady operation of the pump unit.

scholarly journals Energy Efficiency Analysis of Fixed-Speed Pump Drives with Various Types of Motors

2019 ◽  
Vol 9 (24) ◽  
pp. 5295 ◽  
Author(s):  
Victor Goman ◽  
Safarbek Oshurbekov ◽  
Vadim Kazakbaev ◽  
Vladimir Prakht ◽  
Vladimir Dmitrievskii
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Duty Cycle ◽  
Induction Motors ◽  
Electric Motors ◽  
Pump Unit ◽  
Permanent Magnet Synchronous Motors ◽  
Variable Flow ◽  
Synchronous Motors ◽  
Flow Pump

The paper presents a comparative analysis of energy consumption by 2.2 kW electric motors of various types and energy efficiency classes in the electric drive of a pump unit with throttle control in a water supply system. Line-start permanent-magnet synchronous motors of the IE4 energy efficiency class and induction motors of the IE4 and IE3 energy efficiency classes of various manufacturers were considered (IE4 and IE3 are labels of energy efficiency classes of electric motors according to IEC 60034-30-1 standard). Energy consumption at a hydraulic load changing under a typical duty cycle was calculated based on the nameplate data of the pump and electric motors. The developed method shows that selecting an electric motor based on the IE energy efficiency class under the IEC 60034-30-1 standard (i.e., based on efficiency at a rated load) may not provide the minimum energy consumption of a variable flow pump unit over a typical duty cycle. In particular, the considered IE4 class line-start permanent-magnet synchronous motors do not provide significant advantages over IE4 class induction motors, and sometimes even over IE3 class induction motors when they are used in variable flow pump units.

scholarly journals Justification on Choosing Screw Pumping Units as Energy Efficient Artificial Lift Technology

2021 ◽  
Vol 64 (2) ◽  
pp. 143-151
Author(s):  
D. I. Sidorkin ◽  
K. S. Kupavykh
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Hydraulic Fracturing ◽  
Permanent Magnet ◽  
Specific Energy Consumption ◽  
Oil And Gas Industry ◽  
High Yield ◽  
Reservoir Pressure ◽  
Permanent Magnet Motor ◽  
Artificial Lift

The paper analyzes the main techniques and technologies of oil fluid recovery in the context of energy consumption, significantly rising over the latest decade. It is recognized that the number of publications in the area of energy efficiency is growing steadily. Currently Russian oil and gas industry are facing the task of accelerating reduction of energy consumption while preserving, or even increasing, production rates. The task is complicated by the fact that the majority of deposits in Russia either have already entered (primarily, Volga-Ural region) or are now entering (West Siberia) their last stage of exploration, whereas new deposits in East Siberia are only being brought into production. Furthermore, a lot of new deposits, which provide for high recovery rates, are profitable a priori as at the first stage of exploration they do not need any artificial lift due to their free flow production without any oil well pumps. However, there is a significant share of new deposits with low-permeability reservoirs, which require either a system of reservoir pressure maintenance or periodic hydraulic fracturing. At the same time deposits at the late stages of exploration, apart from the use of pump units, systems of reservoir pressure maintenance and hydraulic fracturing, require regular repair and restoration, measures against salt and heavy oil sediments, mechanical impurities, flooding, etc., which all has a negative effect on well profitability. In order to solve these problems, the authors review existing methods and calculate specific energy consumption using various pump systems for hypothetical wells, varying in yield. According to the research results, it has been revealed that from the point of view of energy efficiency, it is desirable to equip low- and low-yield wells with sucker rod progressive cavity pump units, medium-yield ones – with electric progressive cavity pumps driven by permanent magnet motor, medium- and high-yield wells – with electric progressive cavity pumps or electric submersible pumps driven by permanent magnet motor, depending on the characteristics of the pumpedout oil fluid.

Variable frequency of pulse hydraulic fracturing for improving permeability in coal seam

2013 ◽  
Vol 23 (6) ◽  
pp. 847-853 ◽  
Author(s):  
Quangui Li ◽  
Baiquan Lin ◽  
Cheng Zhai ◽  
Guanhua Ni ◽  
Shen Peng ◽  
...  
Keyword(s):  
Coal Seam ◽  
Hydraulic Fracturing ◽  
Variable Frequency ◽  
Pulse Hydraulic Fracturing

Pulse Hydraulic Fracturing of a Rock Massif - The STIROMAS Project

2017 ◽  
Author(s):  
H.S. Semíková ◽  
O. Vaněček ◽  
M. Vaněček ◽  
O. Krásný ◽  
P. Kučera ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Rock Massif ◽  
Pulse Hydraulic Fracturing

Study and Application of Pulse Hydraulic Fracturing for Tight Oil Reservoir

2021 ◽  
Author(s):  
Hongxing Xu ◽  
Hu Sun ◽  
Zuwen Wang ◽  
Mian Zhang ◽  
Jianping Lan ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Hydraulic Fracturing ◽  
Pulse Frequency ◽  
Tight Oil ◽  
Oil Reservoir ◽  
Pressure Amplitude ◽  
Fracture Pressure ◽  
Pulse Hydraulic Fracturing ◽  
Tight Oil Reservoir ◽  
Hydraulic Pulse

Abstract Pulse hydraulic fracturing is a promising stimulation technology to enhance the effectively permeability of coal seams. The fundamental of pulse hydraulic fracturing is that fracturing fluids with a certain frequency are injected into coal, resulting in the rupture of coal and forming a well-distributed fracture network due to the pulse loading. Better effects of gas extraction using pulse hydraulic fracturing had been gotten compared with that of hydraulic fracturing. Accordingly, how to apply pulse hydraulic fracturing technology to improve the fracturing effect of tight and shale reservoirs is a question worth thinking about, although this is very challenging due to the totally different downhole operating conditions. In this paper, experimental apparatus for fatigue damage of quasi-triaxial rock under alternating loads was established. The maximum injection pressure is 50MPa, while the pulse pressure amplitude is greater than 5MPa, and the pulse frequency is adjustable from 0 to 50Hz. Rock failure experiments under pulsating load were carried out and the effects of different hydraulic pulse parameters and rock properties on rock damage were studied. Experimental results show that hydraulic pulse has different effects on rock compressive strength and fracture pressure of different properties. With the increase of hydraulic pulse frequency, the influence on rock compressive strength increases firstly and then decreases. With the increase of pulse pressure amplitude, the influence on rock strength increases. With the increase of hydraulic pulse processing time, the influence on rock fracture pressure increases firstly and then tends to stabilize. Hydraulic pulse has the greatest influence on the compressive strength and fracture pressure of He 8 reservoir, followed by Chang 8 and Chang 6 reservoir of Changqing Oilfield in China. Based on the experimental results, hydraulic pulse frequency is preferred to be about 18-20Hz, accordingly, a downhole hydraulic pulse generator is designed and manufactured. The indoor test results show that the generator performance meets the design requirements. Field tests of pulse hydraulic fracturing were carried out in 3 wells in Changqing tight oil reservoir. Encouraging results were obtained, the average construction pressure was reduced obviously and average daily production per well increased significantly compared to adjacent wells.

scholarly journals Effects of Cyclic Loading on the Pore Structure of Anthracite Coal

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Dong Wang ◽  
Tie Li ◽  
Zhiheng Cheng ◽  
Weihua Wang
Keyword(s):  
Cyclic Loading ◽  
Hydraulic Fracturing ◽  
Pore Structure ◽  
Wave Amplitude ◽  
Testing Machine ◽  
Sine Wave ◽  
Shanxi Province ◽  
Loading Frequency ◽  
Anthracite Coal ◽  
Pulse Hydraulic Fracturing

In the process of improving coalbed permeability through pulse hydraulic fracturing, the cyclic loading effect influences the characteristics of micropores in coal matrix, thus affecting the process of gas migration. Therefore, it is essential to investigate the effect of cyclic loading on the pore structure of coal. Seven groups of loading tests at different frequencies and amplitudes were conducted on anthracite coal obtained from Shanxi Province, China, using a fatigue-testing machine. Subsequently, using a PoreMaster GT-60 Mercury-intrusion apparatus, the influence of the frequency and amplitude on the structural characteristics (including mercury-injection and mercury-ejection curves, pore size distribution, porosity, and specific surface area) of pores in coal samples was analyzed. Finally, the law and mechanism of action of the loading frequency and amplitude on pores in coal samples were comprehensively analyzed. The test results showed that, in the case of maintaining the sine-wave amplitude unchanged during loading while altering the loading frequency, the overall porosity and pore volume rise at different degrees. The growth of the loading frequency presents a more significant promotive effect on the initiation and development of pores and fractures. Moreover, it drives the transformation of micropores and transition pores into mesopores and macropores, thus increasing the proportion of seepage pores. Under the condition of large sine-wave amplitude during loading, macropores and mesopores are subjected to the repeated action of the external force, thereby reducing the overall porosity. In addition, the volume of the seepage pores declines, and the number of the coalesced pores decreases. Finally, in light of these results, the implications of frequency and amplitude selection in the process of pulse hydraulic fracturing are discussed. Therefore, the results of this research will provide an important theoretical basis for the field application of pulse hydraulic fracturing technology in coal mines.

scholarly journals Energy Efficiency Enhancement Potential of the Heat Pump Unit in a Seawater Source Heat Pump District Heating System

2016 ◽  
Vol 146 ◽  
pp. 134-138 ◽  
Author(s):  
Shu Hiawen ◽  
Wang Tingyu ◽  
Jia Xin ◽  
Ren Zhiyong ◽  
Yu Haiyang ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Heat Pump ◽  
District Heating ◽  
Heating System ◽  
Efficiency Enhancement ◽  
Pump Unit ◽  
District Heating System ◽  
Heat Pump Unit
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