Determination of Downhole Dynamometer Cards for Deviated Wells

Araújo, A. P.; Maitelli, André Laurindo; Maitelli, C. W. S. P.; Santos, Diogo Pereira dos; Costa, Rafael F. S.

doi:10.2118/173970-ms

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…In 2015 Araujo et al [17] presented a model for deviated sucker rod strings without any path constraints. They suggested the well trajectory's parametrization in three-dimensional space by the arc length and a vector description.…”

Section: Fig 2 Predictive and Diagnostic Analysismentioning

confidence: 99%

Sucker rod pump downhole dynamometer card determination based on a novel finite element method

Eisner¹,

Langbauer²,

Frühwirth³

2021

Liq., gas. energy resour.

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An advanced dynamic finite element model is presented that diagnoses the downhole pump performance of sucker rod pumping systems, applicable for any pumping conditions and equipment used. The results are compared to downhole measurements and other evaluation techniques. Buckling is an undesirable phenomenon occurring in sucker rod pumping. It essentially depends on the plunger load, which is a function of time and typically not measured but evaluated by diagnostic tools. Existing diagnostic tools exhibit specific limitations that reduce their applicability and output quality. This paper introduces a diagnostic tool, which can predict the rod string's stress field and its movement not only at the pump plunger but all along the rod string. Moreover, this tool can account for the interaction between rod guides and tubing as well as rod string and tubing. To this end, innovative tube-to-tube contact modeling is applied. The high precision results are accomplished by running a dynamic finite element simulation. The basic principle is to evaluate the plunger load incrementally by consecutively applying restarts of each time step, fully automated and computation time optimized. This publication shows that both the plunger load and the rod string's dynamic behavior can be determined for any given wellbore as long as the borehole trajectory and surface dynamometer measurements are known. The dynamic finite element model is evaluated for a deviated system and a vertical system equipped with two different downhole pump types. Comparing the simulation results with the available downhole measurements and the analytical solution shows an excellent match, whereas the proposed solution provides a considerable amount of details about the overall system's behavior. The evaluation has shown that the performance of standard and novel downhole pump types can be successfully diagnosed in detail, which is just possible under limitations with commercial software solutions. This tool can correctly predict whether or not the sucker rod string is subjected to buckling during the downstroke, which has a considerable effect on increasing the mean time between failures of a sucker rod pumping system. From the economic point of view, this means that the economic limit of a wellbore can be postponed. The novelty of the shown technique is the consideration of the full 3D trajectory and the implementation of only physical properties, result in an excellent accuracy of the output.

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Section: Fig 2 Predictive and Diagnostic Analysismentioning

confidence: 99%

Sucker rod pump downhole dynamometer card determination based on a novel finite element method

Eisner¹,

Langbauer²,

Frühwirth³

2021

Liq., gas. energy resour.

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show abstract

“…An example of later research is a comprehensive model presented by (Xu et al 1999). Some more recent works are a simulation model proposed for oil-producing wells that does not cover directional wells (Dong et al 2013); a patent (Pons 2014) and an algorithm (Araujo et al 2015) to compute the downhole dynamometer card of a directional sucker-rod well based on its surface dynamometer card; and a novel mathematical model to numerically compute sucker-rod string dynamics in deviated wells in predictive or diagnostic mode (Moreno and Garriz 2020).…”

Section: Introductionmentioning

confidence: 99%

A simulation model for dynamic behavior of directional sucker-rod pumping wells: implementation, analysis, and optimization

Araújo

Xavier‐de‐Souza

2021

J Petrol Explor Prod Technol

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Sucker-rod pumping wells can be either vertical or directional. Over time, research efforts on the functioning of vertical wells led to a well-established set of mathematical models and practical tools. When it comes to directional wells, however, no general agreement has been reached, and the topic remains in active discussion. This paper revisits, extends, implements and optimizes an overlooked model, initially devised in 1995, whose computational complexity resulted in long processing times that stymied its adoption. This model fully utilizes the 3D trajectory of the rod string, allowing for the use of two viscous friction models and proposing its own formulation for downhole boundary conditions. The resulting model can be used to efficiently simulate the dynamic behavior of directional sucker-rod pumping wells taking into account the fluid flow inside the rod-tubing annulus. We present and analyze a serial and a parallel software implementation of this CPU-intensive model based on an explicit finite-difference method. We also describe our contributions to the accuracy and performance of the original model and software implementation. A rough approximation shows that the proposed serial version is about 200 times faster than the legacy original code, if we were to run the latter in a modern processor. On top of that our parallel implementation achieved a 6.5$$\times $$ × speedup over the serial version in a shared-memory system, making it a suitable tool for well design and optimization. The research contributes to the discussions on mathematical modeling of directional sucker-rod pumping wells, and illustrates how performance-focused techniques can enable the effective use of computationally demanding models to facilitate further refinements and applications.

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Application and effect of buoyancy on sucker rod string dynamics

Lao

Zhou

2016

Journal of Petroleum Science and Engineering

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Determination of Downhole Dynamometer Cards for Deviated Wells

Cited by 5 publications

References 2 publications

Sucker rod pump downhole dynamometer card determination based on a novel finite element method

Sucker rod pump downhole dynamometer card determination based on a novel finite element method

A simulation model for dynamic behavior of directional sucker-rod pumping wells: implementation, analysis, and optimization

Application and effect of buoyancy on sucker rod string dynamics

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