Abstract: Studying the internal pump flow field, especially the mixed-phase flow field, is the key point to improve the pump performance. For this purpose, the University of Petroleum (Beijing) developed a set of simulation test devices for a gas-liquid two-phase flow hydraulic pump. The device consists of a single-phase flow test device and a mixed-phase flow test device. The former can simulate various working conditions in the downhole well and flow state of liquid in the oil pump more accurately, the latter can simulate different oil-gas ratio. In order to quantitatively complete the transient measurement of the flow field without disturbing the flow field, the image processing results of the velocity vector and the curl field of the planar flow field are given to reveal the transient flow structure of the flow field. , Spatial resolution and fast dynamic response characteristics of particle imaging speed (PIV) advanced technology. Oil pump is one of the main equipment in the process of oilfield development. Improving the performance of oil pump can effectively increase the output of crude oil in the oilfield and improve the economic benefits of oilfield development. At present, the development of the pump can be divided into the following three aspects. (1) Based on the mechanics analysis, through the simplification of the movement conditions and the stress conditions, the mechanical valve opening and falling process is described mechanically; (2) Based on the principle of functional design according to the production needs, the technical innovation is made on the basis of the original pump structure , Such as the development of anti-sanding card pump and anti-gas pumping heavy oil pump; (3) The related testing and observational studies in the laboratory are carried out for the purpose of studying the efficiency of pumping oil pump and its influencing factors. Such as Daqing Petroleum Institute pump energy consumption test research, the use of pressure sensors and displacement sensors to measure the pump import and export pressure curve, the pressure drop curve of the ball valve and the dynamometer, leakage and so on. At the moment, the most fundamental problem with pump performance improvements - the pump flow field - is not covered yet. The key factor to solve the problem of pump valve's movement, reasonability of pump structure and its improvement is the flow field in the pump. Therefore, studying the flow field in the pump, especially the mixed-phase flow field, is the key point to improve the performance of the pump . With PIV (particle image velocimetry) technology, LDV (Laser Doppler Flow Velocimetry) technology and ultrasound technology are maturing, one can use these advanced flow field test techniques to reach the assay without disturbing the flow field High-precision, there are already examples of the use of these advanced technologies in Canada to study the pump flow field, but no published results were found. Therefore, the use of PIV and other advanced technology to study the flow field within the pump to improve the structure of the pump is the general direction of development in the future. In view of this, the University of Petroleum (Beijing) Offshore Engineering Laboratory carried out a visualization of the internal flow field in the pump. Since there is no precedent in this respect, it is planned to proceed with the experiment first and put both theory and practice together. Pump simulation test device design ideas Pump in the downhole working medium is not single-phase, so on-site pumping pump cavity flow field actual test more difficult. In order to save time and money, but also to test the flow field of pump cavity under normal circumstances, the pump simulation test device must have gas source and liquid source, as well as visualization of research conditions, and the flow rate can also be single Liquid and gas-liquid two-phase flow characteristics of the pump when the visual observation and recording, so the entire pump chamber should be transparent. In addition, due to the strong variation of the flow field, there should be a corresponding data acquisition and processing system. In order to observe the effect of pump stroke on the flow field, the rod drive system should be adjustable. The structure of the simulation test device is designed to simulate the vertical reciprocating motion of the plunger and polished rod of the on-site oil pump, and the proper power system must be selected. One solution is to reduce the on-site pumping system of ground power, that is, take the motor-driven donkey head drive. The disadvantage of this solution is the high cost, large area, not suitable for laboratory use. Another solution is to use the motor to drive the rope directly through the pulley rod and plunger up and down movement, but in order to ensure the balance of the system to be configured balance weight, the other selection of micro-motor has difficulty. These two programs are unable to simulate the import and export pressure pump, pump flow can not be adjusted. To solve the above problems, I used hydraulic control system and pneumatic control system to achieve dynamic system simulation. Hydraulic control system is mainly to achieve reciprocating plunger up and down and control the pressure of import and export, pneumatic control system is to control the mixed-phase flow of intake. At the same time, the hydraulic control system is divided into two parts: the first part is the power cylinder hydraulic system, which is the main power source; the second most is the pump pressure compensation system, mainly used to control the pump import and export pressure And for the pump oil. Here are the three parts to be introduced. 1. Power cylinder hydraulic system Power cylinder hydraulic system mainly by the power cylinder, travel switch, two four-way solenoid valve, relief valve, pump and governor valve composition, the process shown in Figure 1. Figure 1 power cylinder hydraulic system flow chart 1-power cylinder; 2-two-way electromagnetic reversing valve; 3-speed control valve; 4-relief valve; 5- oil pump; 6,7-stroke switch works: Power oil pump to the upper end of the power cylinder, the drive piston downward movement, thus driving the polished rod down, when the polished rod touch the travel switch 6, the two four-way solenoid valve to reverse, the power pump began to lower the power cylinder The oil drives the piston to move upward to drive the polished rod to move upwards. When the polished rod touches the limit switch 7, the 2-position electromagnetic reversing valve is changed over again to resume the next stroke. Speed ​​control valve piston speed can be adjusted to change the stroke, the relief valve can adjust the pressure inside the power cylinder, changing the plunger drive. 2. Suction pump pressure compensation system Suction pump pressure compensation system consists of a fuel tank, pump, sequence valve, accumulator, pump, pressure gauge, pressure tank and relief valve composition, the process shown in Figure 2. Figure 2 pumping pump pressure compensation system flow chart 1-tank; 2-oil pump; 3-sequence valve; 4- accumulator; 5- pump; 6 pressure gauges; 7- pressure tank; 8 accumulator; 9 - Relief valve works: The pump is always in working condition, the relief valve is adjusted to a certain pressure, when the pump inlet and outlet pressure exceeds the regulation pressure, the relief valve overflow, the inlet pressure decreases; when the inlet pressure is too low, Oil pump to the pressure tank oil, so that the import pressure rose to adjust the pressure. The role of two accumulators is to avoid the import and export pump pressure fluctuations, to ensure that the import and export pump pressure to meet operating conditions. 3. Pneumatic Control System Pneumatic control system consists of air pump, gas flow meter, solenoid switch, check valve and travel switch, the process shown in Figure 3. Figure 3 pneumatic control system flow chart 1-gas pump; 2-gas flowmeter; 3-electromagnetic switch; 4-way valve; 5 5- pump; 6-stroke switch works: When the pumping pump to do the stroke of the movement, Switch open, the gas into the pump through the one-way valve, when the polished rod contacts the upper limit switch, the electromagnetic switch is closed, the gas barrier, when the pumping pump to do the next stroke. When the polished rod touches the down stroke switch again, the electromagnetic switch is opened and the gas path is opened, and the gas is supplied to the oil pump again. Simulation test device features
1. 3 /4/ 5 inch Medium Duty Caster Wheel PVC/ PU / TPR
2. High quality galvanized support
3. Single wheel PVC / PU / TPR / PVC material
4. Double ball bearings caster wheels
Medium Duty Caster Wheels,Medium Duty Casters,Caster Wheel Swivel Type,Replacement Swivel Wheels
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