Development and Application of a New High-efficiency Plunger for Deep Well Pumps

Development and Application of a New High-efficiency Plunger for Deep Well Pumps in Fault Block Oil and Gas Fields Fan Xiyan1 Yu Xin1 Shi Weishan亘2 Xu Guidong1 Cai Zao1 (1.Miyou No.5 Plant, Zhongyuan Oilfield Company2.Mizo Oil Engineering & Technology Research Institute, Zhongyuan Oilfield Company) Analyze the line. In view of the current deficiencies, a new type of high-efficiency plunger for deep well pumps has been optimized from the structure and material. Through the analysis of the application data of more than 150 wells in the field, the improved plunger has the characteristics of preventing the upper vane cover from breaking off, improving the pump efficiency and adaptability, and has a good prospect of popularization and application.

Mechanical oil extraction is mainly based on pumping wells. There are 309 oil wells in the Zhongyuan Oilfield No. 5 Production Plant, of which 283 are pumping wells, accounting for 91.6% of the total wells. During the production process, due to the unreasonable design of the Fane cover on the plunger, the pump has a low pump efficiency. The upper fan cover is easy to break off. No.5 oil production plant from 1998 to October 2000, the plunger on the vane cover off 93 wells. This not only affected the production of oil wells, but also shortened the oil well pump inspection cycle, resulting in high maintenance costs for wells. In order to improve the pump efficiency, prevent the ventilator from breaking off on the plunger, reduce the operation, reduce the cost, prolong the cycle of the pump inspection, and optimize the structure and material of the original ventilator cover. A new high-efficiency plunger for the pump is designed.

1 Structure and working principle 8 1.1 Structure Deep well pump The new high-efficiency plunger is mainly composed of the upper fan cover, the upper fan, the upper fan seat, the middle joint, the plunger body, and the lower fan assembly (see below). The upper fan cover is composed of an upper joint and a cylinder body. A liquid outlet hole is formed in the upper joint as a liquid output passage. The structure of the outlet hole was optimized to eliminate the stress concentration and make the force more reasonable. The material was optimized to improve the overall mechanical performance. Inside the cylinder, there is an oil passage, which is used as the flow passage through the cylinder into the channel of the upper joint. At the same time, it also serves as the boundary of the upward movement of the upper wingball. The force of the upper wing ball is also transmitted to the upper fan. ball.

1.2 Working principle When the pump is in the suction process, the liquid passes through the bottom of the Versail assembly and the plunger body opens the upper ball through the flow passage of the cylinder, and is output by the liquid outlet hole of the upper joint and finally discharged to the ground through the oil tube. .

The over-flow channel in the cylinder body, on the one hand, acts as a channel for the liquid to enter the upper joint, and also serves as a limit for the upward movement of the upper flaring ball so that the ball moves in the effective ball room. The liquid outlet of the upper joint is used as the liquid flow to enter the middle part of the oil pipe. It is also the source of the force when the upper ball returns. This reduces the time for the upper ball to fall and achieves the purpose of improving pump efficiency. In the lower stroke, the liquid After the liquid outlet hole of the upper joint enters the oil pipe, because the liquid outlet hole has a certain rotation direction, a certain torque will be generated when the liquid is discharged, so that the sucker rod is buckled tightly to achieve the purpose of preventing the removal.

Deep-well pump new high-efficiency plunger structure shows a joint; 2 - cylinder; 3 - upper Faner ball; a supreme ball seat; 5 - intermediate joint; a plunger body; 7 - next Verre assembly 2 on-site application After the successful development of the new type plunger, it was first applied in H2―43 well test in May 2000 and succeeded. Up to now, the tool has accumulated 156 wells in Huqing Oilfield and has been verified to fully meet the design requirements.

Fan Yan Xi Yan, born in 1965, engineer, graduated from the Department of Energy Geology, Changchun Institute of Geology, 1988. He is currently the deputy chief engineer of the No. 5 Oil Production Plant of the Central Petroleum Exploration Bureau, and is engaged in the management and application of oil extraction technology. Address (457001): Xiangyang City, Henan Province Donghuan Donghuan Community, Tel: (0393) Fan Xiyan et al. Development and Application of a New High-Efficiency Plunger for Deep Well Pumps 2.1 Increasing Fluid Production To verify the liquid capacity of the tool, a new type of high-efficiency plunger is selectively tested on the well inspecting the pump. In combination with the inspection pump, a total of 60 new-type plungers were drilled, of which 58 wells saw the effect of fluid increase in different degrees, and the process success rate was 97%. Comparing the results of the new plunger before and after entering the 60-port inspection pump well, see Table 1 Table 1 Comparison of the average production time of single wells before and after the introduction of a new type of plunger. Time of daily production of liquid/daily oil/pumping efficiency, and dynamic liquid level/measurement before the measure. It can be seen that the introduction of a new type of plunger results in an average daily increase in liquid per well. 6.2m3, 0. 7t of daily oil increase, the average pump efficiency was increased by 17.1%1 and the effect of fluid increase was obvious when the dynamic surface was decreased by 175m.

2.2 Increase the degree of fullness of the pump Another performance of the new high-efficiency plunger is that the falling time of the upper ball is reduced and the closure is rapid. This performance has also been proved in the production application. In the power diagram, it shows that the pump is full and the angularity is clear.

Such as H7-157 well before September 23, 2000 into the new plunger measures before and after changes in the well power diagram (see).

a. Measure after 2.3 measures the production pressure difference, start the low-pressure layer new high efficiency plunger and the ordinary plunger in the same working system, due to the increase of liquid production, the dynamic liquid surface drops, resulting in a reduction of the flow pressure, in some wells The low pressure layer was activated, increasing crude oil production. According to the flow pressure formula, a typical analysis is performed on the well H5-97: Pf - bottomhole flow pressure, MPa; P* average relative density of the liquid space in the casing annular space; Lp - depth of the test dynamic liquid surface, m; H - middle of the oil layer Depth, m; Pa – pressure during mantle measurement, M H5-97 well, working system prior to pump inspection is 038X3X7, pump is 1800m, dynamic fluid level is 1465m, production is 14.7/0.4/93 %; After the pump inspection work system is 038X3X7, the pump is hung up to 1800m, the dynamic liquid surface is 1710m, the production status is 21.3/2.8/87%, the fluid production before the check pump increases by 6.6m3, and the daily increase oil is 2.4t. Substituting the above data into public

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