التفاصيل البيبلوغرافية
| العنوان: |
Pressure Characteristics of Multistage Soft Plunger in an Oil Well Pump. |
| المؤلفون: |
Chunying Hu, Qingda Li, Guoyou Han, Mingyang Liu |
| المصدر: |
Journal of Engineering Science & Technology Review; 2023, Vol. 16 Issue 3, p129-136, 8p |
| مصطلحات موضوعية: |
OIL well pumps, STRUCTURAL optimization, VALUE engineering, CONSERVATION of mass, FLUID pressure, OIL well drilling, FLUID mechanics |
| مستخلص: |
Soft plunger oil well pumps integrate the advantages of scale prevention, simple structure, and convenient maintenance, which can be effectively adapted to well conditions by using alkali-surfactant-polymer (ASP) flooding technology. However, the applic2ation of soft plunger oil well pumps has been greatly limited due to its short inspection cycle. In order to explore the variation law of pressure and velocity fields of multi-stage self-compensating soft plunger oil well pumps and thus prolong their service life, this study established a numerical fluid-solid calculation model via Fluent. This calculation was used to determine the optimal three-stage soft plunger oil well pump models with different lengths and outer diameters. Next, the fluid-solid interface displacement was described and operated by using the Lagrange-Euler model and the deformation condition and stress changes of multi-stage self-compensating soft plunger oil well pumps were analyzed. Meanwhile, the leakage of relatively large clearance flow was equalized based on the law of fluid mechanics and conservation of mass, and that of liquid flowing in the clearance between the soft plunger and the pump barrel was determined. The length of each stage of the soft plunger in the self-compensating oil well pump was then calculated. Theoretical analysis and numerical simulation were combined to explore the effects of structural parameters, including the length and outer diameter of the soft plunger, on the pressure and velocity fields. Moreover, the correctness of the theoretical calculation was verified through its comparison with the numerical results of the two-way fluid-solid coupling. The results show that the maximum stress of each stage of the soft plunger occurs in the lower part of its inner wall while that of the whole oil well pump structure declined gradually from the fluid inlet to the fluid outlet. The fluid pressure in the narrow clearance between the inner wall of the pump barrel and the soft plunger presents a continuous and progressive reduction law. The maximum and the minimum flow velocities appears at the fluid inlet and outlet of each plunger, respectively, where an eddy current forms in their connection areas. A continuous and uniform pressure distribution is realized from the inlet to the outlet in the clearance flow field between pump barrel pairs. With the thirdstage soft plunger of the oil well pump as an example, the pressure field that is obtained under the optimized length and outer diameter of the soft plunger consistently conforms to the staged pressure-bearing characteristic law. Hence, the fluid-solid coupling method adopted in this study is feasible and practical in exploring the pressure characteristics of multi-stage soft plungers. This study provides certain engineering values for optimal pump structural design. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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