2 = TimesNewRoman University of Petroleum East China Department of Mechanical and Electrical Engineering, Shengli Petroleum School After 22, dynamic single screw fruit structure and working principle, given the main components of a single pump pump and single screw horse phase screw. The method of calculating the lead and offset of the bushing's end face diameter bushing is coordinated between the work of Cup Culda, the size of the work piece, and the size of the work piece should satisfy the basic theory and work characteristics of the machine, and consider Actually put forward on site, so ten = universal significance, for the different overall structure layout of the hydraulically driven single screw pump, design time = 3 has the main word hydraulic drive screw pump structure parameter matching calculation hydraulic driven single screw pump is kind New oil production device. This kind of pump has unique advantages in squeezing high-viscosity sand and high gas content crude oil, and has a good application prospect in the field of oil extraction. 1. At present, this type of pump is still in the experimental research stage in China.
Structure and working principle The main components of the hydraulically driven single screw pump consist of a single screw motor single screw pump universal joint or a soft shaft thrust bearing housing and a salvage head.
Rod; 5 single rod motor upper bushing; 61013 universal joint; 7 thrust bearing; 8 single, rod motor lower suspect; 9 single cadmium rod motor lower bush; Rod pump upper bushing; 14 single, rod pump lower mast; 15 single, rod pump lower bushing; 16 shell; 17 lower suction pump works, ground power pump pumps pressure fluid along centerline pump 1 The channel is transported to the upper chamber of the upper two-screw motor and drives the screw of the two-screw motor to rotate, converting the liquid energy into mechanical energy, and the used waste power fluid is discharged to the oil jacket through the C-channel of the plant chamber and the d-channel of the chamber respectively. The power output from the two-screw motor of the annular space i drives the screw of the lower two screw pumps to rotate, so that the underground crude oil is sucked into the chamber between the two screw pumps through the lower suction valve through the six channels, and is pressurized by the two screw pumps and the upper part Crude oil pumped by the screw pump is discharged into the annular space of the oil casing through the channel of the chamber, and the crude oil pumped by the lower screw pump is discharged into the annular space through the six channels of the chamber. The mechanical energy is converted into liquid energy. The used and used power liquid is mixed with the crude oil discharged by the two-screw pump and transported to the ground via the oil jacket annular space. According to the needs of the oil field, the author proposes the structural parameters of the hydraulic driven screw pump and the complete set of dynamic matching calculations. method.
Parameter calculation 1. Initial setting of the parameters According to the actual working conditions, the pump discharge volume, speed, and volumetric efficiency are initially determined. To make the pump work for a long time, the following relationship should be satisfied between the diameter of the lead bush of the screw bush and the eccentricity. Li Zengliang, associate professor, was born in 1962 and graduated from the Department of Mechanical Engineering of East China Institute of Petroleum Mechanical Engineering in 1984. University of Beijing to pursue a PhD, from teaching and research work. Address 257062 Dongying City, Shandong Province. Tel 0546 Received 2001 D Screw section diameter, e eccentricity, 1 signal.
The old power density of the oil screw motor worked, 1; the following formula can be obtained, the value of the range of 6 Qp downhole single screw pump actual flow, 3; n downhole single screw pump speed, rmin; Vv volumetric efficiency, at 800.85 Select between; 2. Parameter determination and verification Set a value within the range of 706 to make it meet 71 requirements. The flow formula is such that the calculated rotational speed and rotational speed calculation result must be close to the initial rotational speed.
According to the following formula, it can be determined that the bushing section long axis length and bushing outer circle diameter power match calculation 1. The pump section power matching downhole screw pump To transport the pumped crude oil to the ground, the liquid in the annular space of the oil casing must be overcome For the purpose of resistance, the actual liquid flow energy equation for the section of the annular section of the oil casing in the borehole screw pump outlet section to the borehole oil casing annulus section 2 is established.
The pressure at the 12 section, ie, the pressure at the outlet of the downhole screw pump and the wellhead pressure, the flow rate at the VB22 section, muscle 8; the hydraulic loss at Ihl7, and the velocity head at the 12 section, can be calculated. Then the pump can be obtained. The working load then, the effective power of the single screw bushing pair is due to the fact that the downhole single screw pump is symmetrically arranged with the twin screw bushing pair, so that the axial hydraulic load balance, simplify the structure of the thrust bearing, so the whole down hole single screw pump Effective power is p, pump inlet pressure or submergence pressure, 8; Np effective power of a single screw bushing pair, knowledge; Ne single screw pump effective power, take. As a result, the shaft power and the torque on the pump shaft of the single screw pump can be determined. Naxp2 The shaft power on the single screw bushing pair Ms The on-axis torque of the single screw bushing pair, Maz The total torque of the whole downhole pump, Vs The pump efficiency of the downhole screw pump can be selected between 0.6 and 0.7 in the initial design. For safety, it is recommended to choose a smaller value.
2. Power matching of the motor part In order to match the downhole motor with the downhole pump, the structural parameters of the screw bushing pair in each screw motor should be the same as the structural parameters of the screw bushing pair in the screw pump, taking into account the screw motor The balance of the axial hydraulic loads in order to reduce the structural wells of the axial thrust bearings increases their life, so the two screw bushing pairs are also symmetrically arranged in the axial direction. In this way, the output power of the entire motor should be equal to the input power of the entire pump, and due to the rotation speed, the output torque of the entire motor and the input torque of the entire pump are also equal.
The high-pressure power fluid from the surface pump is used as the input total flow rate of the downhole motor and is divided equally between the two screw motors. It is noted that most of them are used to drive the screw work, and the other part is lost through the gap between the screw and the bush. . Then the actual input flow rate required in a single screw motor can be calculated by the following formula to be the same as the theoretical flow rate in a single screw pump. The volumetric efficiency of a 3Vnv motor is generally 0.8.
The entire downhole single-screw motor requires the total actual input flow provided by the ground power pump. The liquid energy input by the screw motor is mostly converted into mechanical energy, which is output by the screw motor universal coupling and transmitted to the pump shaft. According to the principle of energy balance, the PM single-screw motor inlet and outlet pressure difference, 1 screw motor efficiency, generally desirable 0.6.
Under the calculated conditions, the pressure at the cross section of the actual liquid energy equation Pl, p212 from the wellhead 2 section to the downhole single screw motor population 1 section can be established. The liquid velocity at the t, V2l2 section is mS. The density of the liquid, helium, and hydraulic fluid flow from the wellhead 2 section through the tubing to the downhole single-screw motor population 1 section of the hydraulic damage to the downhole single screw motor and the single rod pump both have the same outlet pressure, both for the single screw motor population The pressure at the cross-section 1 can be obtained from the following formula. Substituting the above-mentioned known conditions into the formula 23 and sorting it out, the formula for calculating the cross-section pressure at the discharge outlet of the ground power pump can be obtained. According to the above analysis and calculation results, it is convenient. The ground power pump is matched to meet the requirements of flow and pressure.
Conclusion The calculation method and theory of the main structural parameters and dynamic matching of the screw bushing of the hydraulically driven single-screw pump are based on the basic theory and work characteristics of the single-screw hydraulic machinery, and fully consider the actual situation on the site. The proposed design of this type of screw pump has universal guiding significance; the specific calculation formulas given are derived for a general structural arrangement, and the design of the hydraulically driven single mast pump for this scheme can be Direct application; For hydraulically driven single screw pumps with different overall structural arrangements, some formulas should be re-derived during the design process.
1 million Banglie, Li Jizhi. Petroleum Engineering Fluid Machinery. Shandong Dongying Petroleum University Press, 19993603882 Wan Banglie. Single pole type hydraulic machinery. Dongying Petroleum University of Shandong Province edited this article Zhu Bilan
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