Abstract
Sucker-rod pump plant operation is accompanied by inertial and shock loads, affecting the fatigue strength of sucker rods and causing possible accidents. This work proposes the original design of a shock absorber of a sucker-rod string. The peculiarity of the proposed design is the usage of thin plate packages as a bearing elastic element of the shock absorber. This approach to the elastic element’ design provides the shock absorber to be easy to manufacture and operate. Sucker-rod string protection from extra load will increase the sucker-rod pump plant efficiency in general. This study aims at developing shock absorber’s design and studying its most important performance options—strength and rigidity. A mechanical and mathematical model of a shock absorber’s elastic element was developed in order to specify its deformation. A package of thin plates was modelled as an equivalent solid plate with a cylindrical rigidity providing equal properties of the solid model and the plate package. This model makes possible to describe analytically the stress-strain state of the shock absorber bearing elements. The work presents the final expressions of the shock absorber’s strength and rigidity assessing in a convenient form for engineering practice. The numerical approbation of the obtained analytical results was carried out as the case of a plate elastic element. The authors give recommendation on the bearing unit’s design of the shock absorber.
Highlights
Pump-jacks with rotary and combined balancing, driven by asynchronous motors, are widely used for oil production by deep-barrel pumps due to their advantages as simplicity of construction and work reliability [1,2,3]
Sucker-rod pump plant operation is accompanied by inertial and shock loads, affecting the fatigue strength of sucker rods and causing possible accidents. is work proposes the original design of a shock absorber of a sucker-rod string. e peculiarity of the proposed design is the usage of thin plate packages as a bearing elastic element of the shock absorber. is approach to the elastic element’ design provides the shock absorber to be easy to manufacture and operate
A package of thin plates was modelled as an equivalent solid plate with a cylindrical rigidity providing equal properties of the solid model and the plate package. is model makes possible to describe analytically the stress-strain state of the shock absorber bearing elements. e work presents the final expressions of the shock absorber’s strength and rigidity assessing in a convenient form for engineering practice. e numerical approbation of the obtained analytical results was carried out as the case of a plate elastic element. e authors give recommendation on the bearing unit’s design of the shock absorber
Summary
Pump-jacks with rotary and combined balancing, driven by asynchronous motors, are widely used for oil production by deep-barrel pumps due to their advantages as simplicity of construction and work reliability [1,2,3]. These units do not provide best (optimal) loading conditions for sucker rods as far as sucker-rod string’s motion is determined only by driver’s kinematic and does not depend on the load in the upper part of the string [1, 4]. Apart from regular loading, sucker-rod pump plant usage is accompanied by a wide range of oscillations and inertial and shock loadings, adversely affecting the fatigue strength of sucker rods and pump tubes and causing possible accidents. erefore, sucker-rod protection from extra loading is an urgent problem; its solution will increase sucker-rod pump plant’s efficiency and effectiveness and save on additional costs
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