Buckling of a twisted rod with centralizers in a tubing

Zhang, Qiang; Wang, Xiaolong; Li, Wei; Xiao, Zhongmin; Yue, Qi; Zhu, Yueying

doi:10.1016/j.petrol.2021.108731

Cited by 6 publications

(3 citation statements)

References 58 publications

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“…The issue of pipe and rod wear prevention in such wells has always been of great concern [9][10][11]. At the same time, researchers around the world have also achieved a series of important results on the issue of wear and tear [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Study on the Wear Performance of Polyethylene Inner Lining Pipe under Different Load and Mineralization Conditions

Ding

Wang

Liu³

et al. 2023

Coatings

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This study conducted pin disc friction and wear performance tests on polyethylene-lined oil pipes and four types of centralizing materials (45# steel, nylon, polytetrafluoroethylene (PTFE), and surface alloy coating) in oil fields. The friction coefficient and wear rate were tested, and the wear mechanism was analyzed using scanning electron microscopy (SEM) and three-dimensional confocal microscopy. Using a combination of experimental testing analysis and theoretical research, a comprehensive evaluation of the current wellbore centering and anti-wear technology for oil was conducted. The experimental results indicate that the usage limit of polyethylene-lined oil pipes is 400 N, and compared to metal oil pipe materials, the wear rate of both stabilizing material and tubing material is lower, indicating that it has a certain service life. From the perspective of testing load, taking into account the factors of friction coefficient and wear rate, the recommended sequence of straightening material for polyethylene lined oil pipes is (1) surface alloy coating, (2) nylon, (3) PTFE, and (4) 45# steel.

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Section: Introductionmentioning

confidence: 99%

Study on the Wear Performance of Polyethylene Inner Lining Pipe under Different Load and Mineralization Conditions

Ding

Wang

Liu³

et al. 2023

Coatings

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“…However, during the servicing process, oil tubing is subject to corrosive media and complex loads and is prone to eccentric wear [9], uniform corrosion [10], pitting corrosion [11], stress corrosion cracking [12], and other failures. When used as a gathering and transportation pipeline, systematic defect detection must be carried out to ensure the safety of transportation.…”

Section: Introductionmentioning

confidence: 99%

Failure Analysis of Cracked P110 Repaired Tubing Used for Gas Transmission

Zhang,

Xie,

et al. 2023

Materials

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With green and low-carbon developments in oil fields, an increasing amount of repaired oil tubing is being used as oil and gas transmission pipelines in China. However, due to differences in manufacturing standards between oil tubing and transmission pipelines, there are inevitably some issues during their use. This paper investigates a case of cracking failure in repaired oil tubing used as a gathering and transportation pipeline. The failure occurred after eight months of operation and was characterized by a circumferential crack at the male thread end of the tubing joint. To determine the root cause of the failure, a series of experiments were conducted on the oil tubing. The experiments included visual inspection, chemical composition analysis, mechanical properties testing, hardness testing, metallographic examination, and microstructure analysis. The results revealed that the thread of the cracked tubing was not tightened to the specified position; the connection between the tubing and the coupling was welded in a circumferential direction; and cracks occurred in the heat-affected zone of the weld. Chemical composition, tensile performance, and the Charpy impact of the tubing meet the requirements of API 5CT for P110 material, and no abnormalities were found in the metallographic structure. The microstructure at the weld toe of the fracture is martensite, and the hardness is 476 HV10. Based on the thermal simulation verification test, when the material of the tubing cools from 1200 °C, which is located in the coarse HAZ temperature zone, the base metal transforms into martensite with a little granular bainite, exhibiting its highest hardness value at 371 HV10, which is higher than the allowable hardness for carbon steel and indicates the material has poor weldability. The reasons for the cracking and failure of the tubing are that the P110 repaired tubing has a high carbon equivalent and poor weldability. During the welding process, martensitic structure was formed at the weld toe, and cold cracks appeared in the heat-affected zone, resulting in failure. To avoid the reoccurrence of such failure, recommendations are proposed.

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“…The formula of moment of inertia of different cross sections was firstly deduced, and the calculation formula of the critical force of the hydraulic cylinder rod with defects was obtained by doing research on the rod with the cylindrical defects. Zhang et al 16 proposed a novel numerical simulation methodology to discretize the sucker rod and centralizer into beam elements. Beam and gap elements were combined to describe the contact between the sucker rod and the tubing.…”

Section: Introductionmentioning

confidence: 99%

The failure behavior of buckling pin valve: Theoretical, numerical, and experimental study

Zhang

Che

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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At present, buckling pin in the bypass of piping as pressure relief valve has been gradually utilized in the low-concentration coal-bed methane (CBM), which bends to release pressure when the main valve fails leading to pipeline blockage. However, current researches mainly focused on the buckling behavior of hydraulic cylinder rod or rod string, and less consideration was given to the operational reliability of buckling pin valves. This paper deduced the calculation formula of the critical failure load based on Euler formula in the buckling pin under buckling load. Besides, three finite element models (FEM) based on Johnson−Cook constitutive model were compared to predict failure strength of buckling pin which were verified by experiment. In addition, the defect sensitivity analysis of the buckling pin under different initial geometric defects rate was carried out. The results showed that a) the experimental value of the critical failure load in the buckling pin was 206.04 N and the bending position was in the middle of the buckling pin; b) the analysis result adopting explicit dynamic method was in best agreement with the experimental results within deviation of 0.24%; and c) the initial geometric defect of buckling pin should be controlled within 1%. This study provides an important reference to predict the critical failure load of the buckling pin valve and achieve safe transportation of low-concentration CBM.

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Buckling of a twisted rod with centralizers in a tubing

Cited by 6 publications

References 58 publications

Study on the Wear Performance of Polyethylene Inner Lining Pipe under Different Load and Mineralization Conditions

Study on the Wear Performance of Polyethylene Inner Lining Pipe under Different Load and Mineralization Conditions

Failure Analysis of Cracked P110 Repaired Tubing Used for Gas Transmission

The failure behavior of buckling pin valve: Theoretical, numerical, and experimental study

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