Experimental method for evaluating pumping oil polish rod coating for fatigue strength influence

An experimental method, the technology of sucking polished rods, is applied in the direction of applying repeated force/pulsation force to test the strength of materials, etc., which can solve the problems of not reflecting the fatigue performance of the coating, and achieve the effect of reducing the accident of bending fatigue fracture

Active Publication Date: 2010-12-08
ANTON OILFIELD SERVICES (GRP) LTD
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Problems solved by technology

[0004] But in fact, the fatigue performance investigated by this pull-pull fatigue test method is mostly determined by the tensile strength of the polished rod, and the coating has no bad influence on the tensile strength, so this method cannot reflect the real effect of the coating on the fatigue performance. influences

Method used

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Embodiment Construction

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below.

[0021] 1. First, determine the corresponding fatigue test specimens and experimental parameters in combination with GBT 14452 metal bending mechanical properties test method, SY / T5029 sucker rod standard and actual conditions;

[0022] The polished rod sample of Ф28.6mm was selected for the test. The surface of the sample was prepared with 0.4mm thick Ni60 alloy coating by 3 different thermal spraying-remelting processes, and the temperature and speed of the 3 thermal spraying-remelting processes were different. , that is, the temperature and speed are different, and three alloy coating samples are formed, such as sample 1, sample 2 and sample 3, respectively, and the bending fatigue resistance is compared. According to GBT 14452 metal bending mechanical performance test method ...

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Abstract

The invention discloses a test method for evaluating the effect of an oil pumping polished rod coating upon a fatigue strength, which includes the following steps: determining corresponding test sample and experimental parameter of a fatigue test, evaluating the assembly of a simulation device, and simulating the bending fatigue process of an oil field site to carry on an experiment and a comparison. The invention can combine the control system of a tension-tension fatigue test machine and the support and the pressure head of a three-point bending test machine to carry on a three-point bending fatigue experiment and realize the simulation of the bending fatigue process in the scope of 10 centimeters underneath the clip of the oil pumping polished rod in oil field site, when using the invention, the effect of the coating upon the fatigue strength can be effectively evaluated.

Description

technical field [0001] The invention relates to an experimental method in the field of petroleum equipment, in particular to an experimental method for evaluating the influence of the coating of an oil pumping polished rod on the fatigue strength. Background technique [0002] Pumping wells have always been the main method of oil production in oilfields at home and abroad. With the increasing number of deep oil wells, heavy oil wells and high water cut wells, alloy coated polished rods have been widely used for their excellent corrosion resistance and wear resistance. However, due to the metallurgical bond between the polished rod substrate and the coating due to the preparation process of the alloy coating, the influence of the coating on the fatigue performance of the oil pumping polished rod is becoming more and more critical. More than 80% of the polished rods in the oil field are broken under the clips Bending fatigue fracture within 10 cm [0003] At present, there i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/34
Inventor 黄锦滨田斌吴振宁张庚娟
Owner ANTON OILFIELD SERVICES (GRP) LTD
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