SIMULATION OF OPERATION OF DOWNHOLE PLUNGER PUMPING INSTALLATIONS WITH PNEUMATIC COMPENSATORS

Известия Томского политехнического университета: Инжиниринг георесурсов

Veronika A. Molchanova¹  Kamil R. Urazakov¹  Eduard O. Timashev¹ 

[1] Ufa State Petroleum Technological University;

关键词: plunger pump installation with downhole drive;    pneumatic compensator;    technological parameters of the pneumatic compensator;    pressure oscillation;    charging pressure;    working chamber of the pneumatic compensator;   

DOI  :  10.18799/24131830/2020/12/2938

来源: DOAJ

【 摘 要 】

Relevance. To date, the most urgent task of mechanized oil production is to increase the profitability of operation of low-debit and complicated well stock. One of the promising ways to solve this problem is to improve traditional and develop alternative operating technologies, in particular, plunger pumping units with downhole drive.The efficiency of downhole plunger installations is largely determined by the load acting on the pump plunger. A significant increase in cyclic variable loads on the plunger and drive is due to pressure fluctuations in the lift pipes, resulting from uneven pump supply. The above causes the relevance of the development of methods and technologies for reducing pressure pulsations in the lift pipes of downhole plunger installations. Object: pump plunger installation with downhole drive, equipped with pneumatic pressure compensators (pneumatic compensators), working in the bench well. Pneumatic compensators are devices designed to create a uniform flow of liquid in lift pipes. Purpose: to study the effectiveness of pneumatic compensators as part of plunger pumping units with downhole drive, to analyze the influence of technological and geometric parameters of pneumatic compensators on the effectiveness of smoothing pressure fluctuations and flow rate in lift pipes. Methods: development of an analytical mathematical model of the downhole plunger installation in a bench well; numerical experiments to identify patterns of influence of the technological parameters of pneumocompensators on their performance; physical modelling of downhole plunger installation in a bench hole. Results.The authors have obtained the analytical expression that allows calculating the pressure dynamics in the lift (tubing) pipes for a given law of change in the pump supply and energy intensity of the pneumatic compensator system. As a result of modeling the operation of a downhole plunger installation in a bench well, a theoretical barogram of the pressure change in the tubing during the pumping cycle is obtained, which is in good agreement with the actual barogram. Simulation of the operation of the downhole plunger installation equipped with pneumatic compensators shows a significant, almost an order of magnitude, reduction of pressure pulsations in the tubing and loads on the plunger and drive. The influence of the total volume and charging pressure of pneumatic compensators on the efficiency of their operation is analyzed. Practical recommendations for calculating the optimal charging pressure of pneumatic compensators are given.

【 授权许可】

Unknown