Calculation of dynamic loads of the sucker rod pumping system in CBM wells

Liu, Xinfu; Qi, Yaoguang; Liu, Chunhua; Pei, Zhao; Yang, Lei

doi:10.1007/s12404-010-0211-9

Cited by 4 publications

(1 citation statement)

References 4 publications

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“…When the loading rate is higher, the post-peak unloading stiffness of rock is much less than that at a lower loading rate [1]. However present studies mainly focus on mechanical properties such as deformation, strength and failure under the condition of low loading rate [2].…”

Section: Introductionmentioning

confidence: 99%

Tests on Effects of Loading Rate on Modulus and Strength of Sandstone

Zhang

Yue

Wang

2014

AMR

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For studying on the effects of loading rate on modulus and strength of sandstone, uniaxial compression experiment of the samples, from Balikun mine, was performed at different loading rates. The influence of loading rate on average modulus, uniaxial compressive strength and post-peak strength degradation angle was analyzed, and the results indicate that:: The average modulus of sandstone samples increases with loading rate increasing; the both almost obey linear relationship. The peak strength of sandstone grows with the increase of loading rate; there is an approximately exponential relationship between the two. With loading rate increasing, the post-peak strength degradation angle decreases; the relationship between the both is approximately exponential.

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Section: Introductionmentioning

confidence: 99%

Tests on Effects of Loading Rate on Modulus and Strength of Sandstone

Zhang

Yue

Wang

2014

AMR

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Judgment method of working condition of pumping unit based on the law of polished rod load data

Han

Yue

2021

J Petrol Explor Prod Technol

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At present, oil companies are committed to applying the theory and means of mathematics or data science to the research of oilfield data rules. However, for some old oil wells, aging equipment, complex environment and backward management, cause the authenticity and accuracy of the data collected by the equipment cannot be determined. According to the actual engineering demand of the old wells, this paper proposes a method based on principal component analysis, cluster analysis and regression analysis to mine and analyze the data of polished rod load of old oil wells, so as to judge the working conditions of the oil wells. Combined with the application of this study in several operation areas of some oilfields, the findings of this study can help for better understanding of the working condition information hidden in "big data" of oilfield. Meanwhile, the PCA method can reduce the complexity of the original data, the regression equation can calculate the size of the polished rod load more accurately, and the prediction model can effectively judge the working conditions of the old oil wells on site.

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A New Model to Evaluate Polished Rod Load of Sucker Rod Pumping System

Wang

Yang

et al. 2018

Day 1 Wed, September 05, 2018

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Sucker rod pumps provide mechanical energy to lift oil from bottom hole to surface when oil wells do not have enough energy to produce the oil through natural flow. It is efficient, simple, easy to be operated, and can be applied to slim holes, multiple completions, and high-temperature and viscous oils. The disadvantages include excessive friction in crooked holes, solid-sensitive problems, low efficiency in gassy wells, limited depth, and bulky volume. The load on the rod is one of the key factors that dictate the maintenance frequency of pumping unit, energy consumed to lift the fluid, and the optimization of pumping system operating parameters. The cyclic load applied on the rod causes the fatigue and finally the failure of the rod if not designed properly. The rod load is a function of friction force, plunger acceleration/deceleration, weights of plunger, fluid being lifted, and sucker rods string, and the pressures above and below on plunger. Literature review indicates that a model to accurately calculate the load of a pumping cycle is highly desired. In this study, we couple the wellbore with reservoir performance to better analyze the dynamics of pump system, which yields more accurate results. In this study, force balance during the pumping cycle is analyzed. Friction force due to the movement of the plunger and the rod, buoyant force, and gravity force are included in the modeling. The effects of acceleration and deceleration of the plunger on rod are considered. The sensitivity of pumping speed is investigated. This study proposed a more general model comparing with former researches because more factors that affect the load applying on rod are included. Including the friction force due to the viscous fluid is critical to rod load analysis in pumping heavy oil. The proposed model is significant to the cyclic fatigue and failure analysis of rod in sucker rod pumping system. It can be used to predict the possible failure point for rod string by analyzing load along the whole string. It is also a useful tool to design the tapered rod string to minimize the maximum rod load while achieving optimum rod string life. Therefore, an optimization of sucker rod pumping system is implemented by balancing the tradeoff between the maximum rod string life (or rod size) and the minimum rod load (or lowest energy consumption).

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Calculation of dynamic loads of the sucker rod pumping system in CBM wells

Cited by 4 publications

References 4 publications

Tests on Effects of Loading Rate on Modulus and Strength of Sandstone

Tests on Effects of Loading Rate on Modulus and Strength of Sandstone

Judgment method of working condition of pumping unit based on the law of polished rod load data

A New Model to Evaluate Polished Rod Load of Sucker Rod Pumping System

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