Wear detection for progressing cavity pumps with system identification methods

Müller, Jens; Kouhi, Y.; Leonow, Sebastian; Mönnigmann, Martin

doi:10.1016/j.ifacol.2020.12.865

Cited by 3 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We assume Q to be positive definite and R = κI, κ > 0. Although the convergence of the extended Kalman filter is not always guaranteed [5], the observer (12) asymptotically converges under the assumptions on Q and R, if the estimated and measured currents share the same sign. This claim is proved in Appendix A, where we also show the sign criterion can be checked easily.…”

Section: Observer Design For the Estimation Of The Motor-pump Torquementioning

confidence: 99%

“…We how that V (e) = e P −1 e with e = x − x is a Lyapunov function for the observer (12). Since P (t) satisfies the Riccati equation ( 13), P (t) −1 exits, is symmetric and thus its eigenvalues are real.…”

Section: Appendix A: Convergence Of the Extended Kalman Filter Based ...mentioning

confidence: 99%

“…Progressive cavity pumps (PCPs) have a broad range of applications in the food, cosmetics, and petroleum industries, where they are used for fluids with high viscosity and abrasive media in particular [17]. Due to the practical importance of PCPs, model-based methods for flow estimation [2,13,19], modeling of torque in the presence of negligible viscosity and frition effects [17,20], and condition monitoring and wear detection [12] have attracted sustained attention. All these methods require to know the pump speed, torque, or rotor position, which are typically measured by expensive sensors such as absolute encoders or torque transmitters.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Estimating load points of a motor-pump system using pressure and inverter drive data

Kouhi,

Müller,

Leonow

et al. 2020

Preprint

View full text Add to dashboard Cite

We propose a novel method for the estimation of rotor position, speed, and torque of a motor-pump system consisting of a progressive cavity pump (PCP) driven by an induction motor which operates under V/f open-loop control. We compute the speed and rotor position of the PCP by applying a phase locked loop (PLL) to the pressure signal at the pressure side of the pump. An extended Kalman filter is used to estimate the torque of the PCP based on the speed, effective value of the stator current of the induction motor and a nonlinear motor model. Furthermore, we derive a tractable condition under which the convergence of the observer is guaranteed. We use a laboratory experiment to verify our results.

show abstract

Section: Observer Design For the Estimation Of The Motor-pump Torquementioning

confidence: 99%

Section: Appendix A: Convergence Of the Extended Kalman Filter Based ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Estimating load points of a motor-pump system using pressure and inverter drive data

Kouhi,

Müller,

Leonow

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…It is essential to consider downhole conditions for the efficient operation of downhole equipment. Optimization of PCP wear can be achieved through the geometry of the pump, proper selection of stator elastomers and wear-resistant rotor coatings, and correct selection of the pump size for a specific application [11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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

Isaev¹,

Aliev

Дроздов

et al. 2022

Energies

View full text Add to dashboard Cite

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.

show abstract