Numerical investigation of contact stress between rotor and stator in a two-lead progressing cavity pump

Tan, Jinzhu

doi:10.1016/j.petrol.2015.07.026

Cited by 13 publications

(3 citation statements)

References 20 publications

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“…The calculation of Q b uses the mean gap height w mean and is thus only performed once for each combination of speed and differential pressure. The specific value for the gap length L in (7) was found by the comparison between the measured and calculated flow rate for one arbitrary point of operation with non-zero differential pressure and kept constant subsequently. It was found to be L = 2.5mm, which is physically reasonable and is in a similar magnitude as the value reported in [8].…”

Section: Verification Of the Backflowconjecturementioning

confidence: 99%

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Modeling pressure pulsation and backflow in progressing cavity pumps with deformable stator

Müller

Kouhi

Leonow

et al. 2021

Journal of Petroleum Science and Engineering

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This contribution studies the impact of the rotor-stator interaction in a single-stage progressing cavity pump on the flow rate and pressure. Specifically, we investigate the effect of the rotor movement on the sealings formed with deformable stators for various speeds and pressures. Sealings are reconstructed with the help of a geometric 3D model. We analyze the tangential and radial deviation of the rotor from its reference path and show that the radial deviation affects the flow rate, whereas the tangential deviation affects the pressure dynamics. The conjectures are confirmed with a laboratory test setup.

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Section: Verification Of the Backflowconjecturementioning

confidence: 99%

“…These two contact types give rise to three types of sealings [7]. The two areas highlighted in red color in Figure 2 (a) result in the spiral seal line (SPSL) and the warping seal line (WSL), which are shown in Figure 3.…”

Section: Rotor-stator Interactionmentioning

confidence: 99%

Modeling pressure pulsation and backflow in progressing cavity pumps with deformable stator

Müller

Kouhi

Leonow

et al. 2021

Journal of Petroleum Science and Engineering

View full text Add to dashboard Cite

show abstract

“…Models are being developed that combine an analytical model to predict the theoretical performance of a pump with a slippage model [4]. Other studies [5][6][7][8][9][10] have focused on studying the effect of the rotor movement on the sealings of stators for various speeds and pressures and on the improvement of pump design.…”

Section: Introductionmentioning

confidence: 99%

Improving the Efficiency of Curved Wells’ Operation by Means of Progressive Cavity Pumps

Isaev¹,

Aliev

Дроздов

et al. 2022

Energies

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This paper proposes a solution to the problem of improving the reliability of the operation of progressive cavity pump units in deviated and directional wells. High dogleg severity significantly contributes to rod breakage; rods often break close to the “elbows” with a dogleg severity of 2 deg/10 m or higher. Statistical analyses were used to identify the frequency of failures and their impact on the reliability of a PCP unit. The design layout and mathematical model for pump rods’ torsional vibrations in the curved section of a wellbore were developed. A simulation of the curved section was performed. This article provides the basic formulas needed to design a rotating rod string using two reduced discs. The creation of an additional crooked section resulted in multiple reductions in the “resonant” rotational speed and rigidity in the mathematical model. Determining the moment of inertia of the reduced discs’ mass made it possible to determine the sucker-rod string’s stiffness, the circular rotation frequency, and the number of sucker-rod revolutions under resonance. The number of reduced discs on the sucker-rod string depends on the curvature pattern. In summary, a centralizer for a rotating string was designed to reduce the vibration and shock effects of rods on the tubing.

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Effects of elevated temperature and crude oil on the properties of a hydrogenated nitrile butadiene rubber elastomer

Tan

Han

Zhang

2016

J of Applied Polymer Sci

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The stability and durability of hydrogenated nitrile butadiene rubber (HNBR) material in crude oil environments are of great importance for petroleum equipment to resist leakage and to ensure reliability. In this paper, an HNBR material was fabricated, and the degradation of the HNBR material was investigated in simulated crude oil environments. One crude oil and three temperatures (50 °C, 75 °C, and 100 °C, based on actual crude oil operations, were used in this study. Weight changes for the HNBR specimens were monitored after exposure to the environments over time. Optical microscopy was used to show the topographical changes on the specimen surfaces. Attenuated total reflection Fourier transform infrared (ATR‐FTIR) spectroscopy was employed to study the surface chemistry of the HNBR material before and after exposure to the simulated crude oil environments at selected times. Mechanical property tests (tensile and compressive stress–strain tests, tear strength test, and compression set test) were conducted to assess the changes in mechanical properties of the HNBR specimens before and after exposure to the environments. The test results show that the physical–mechanical properties of the HNBR material changed significantly. The temperature and the crude oil had a direct effect on the degradation of the mechanical properties. The ATR‐FTIR test results indicate that the surface chemistry changed via chain crosslinking in the material after exposure to the environments over time. The degradation mechanisms of the HNBR material after exposure to the crude oil could be due to the presence of chain crosslinking, chain mobility, and backbone scission. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44012.

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Numerical investigation of contact stress between rotor and stator in a two-lead progressing cavity pump

Cited by 13 publications

References 20 publications

Modeling pressure pulsation and backflow in progressing cavity pumps with deformable stator

Modeling pressure pulsation and backflow in progressing cavity pumps with deformable stator

Improving the Efficiency of Curved Wells’ Operation by Means of Progressive Cavity Pumps

Effects of elevated temperature and crude oil on the properties of a hydrogenated nitrile butadiene rubber elastomer

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