Method for evaluating performance of drill pipe connector

A technology of drill pipe joints and evaluation methods, applied in construction and other fields, can solve the problems of inability to simulate the stress characteristics of threaded joints and the inability to effectively simulate the stress characteristics of threaded joints

Inactive Publication Date: 2012-04-11
SHANGHAI UNIV
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  • Abstract
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Problems solved by technology

However, due to the relative sliding between the threaded surfaces of the pin and box under the make-up torque, the joint will be tightened to a certain extent, and the two-dimensional axisymmetric model cannot effectively simulate the make-up because the threads are independent of each other. Stress characteristics of threaded joints under torque
In addition, the bending moment is not an axisymmetric load on the drill pipe joint, so the stress characteristics of the threaded joint under the action of the bending moment cannot be simulated by a two-dimensional axisymmetric model

Method used

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  • Method for evaluating performance of drill pipe connector
  • Method for evaluating performance of drill pipe connector
  • Method for evaluating performance of drill pipe connector

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Embodiment

[0029] Example: Evaluating the Performance of Drill Pipe Joints Using Three-Dimensional Finite Element Analysis Technique

[0030] Using this evaluation method to evaluate a drill pipe joint, the main parameters of the drill pipe joint are shown in Table 1.

[0031] Table 1 Main parameters of drill pipe joints

[0032] Outer diameter of thickened part / mm 168.28 Tube outer diameter / mm 130.18 inner diameter / mm 95.25 Thread taper 1:12

[0033] The material used for the drill pipe joint is 37CrMnMoA, which is an isotropic elastic-plastic material with an elastic modulus of 2.06×10 5 MPa, Poisson's ratio is 0.29, the real stress-plastic strain curve of the material is as attached Figure 4 shown. Considering the influence of thread grease containing 40-60% by weight of zinc powder, the coefficient of friction between mating surfaces (including between threads and between shoulder surfaces) is taken as 0.08.

[0034] The von Mises stress distri...

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Abstract

The invention provides a method for evaluating the performance of a drill pipe connector, which has the steps that: finite element pre-processing software is used for dividing a three-dimensional geometric model of the drill pipe connector into grids; a three-dimensional finite element model of the drill pipe connector is built; non-linear finite element analysis software ABAQUS is used for calculation to obtain a vonMises stress distribution nephogram of the drill pipe connector; the impact of the peak and the distribution state of the vonMises stress distribution nephogram of the drill pipe connector on the connecting performance of the connector is investigated to obtain a contact pressure distribution nephogram of a contact surface is obtained; and the impact of the distribution state of the contact pressure distribution nephogram of the contact surface on the sealing performance of the connector is investigated. The method can evaluate the stress characteristics of the drill pipe connector under the single or joint action of torque wrench moment, axial pulling force, bending moment and other complicated external load so as to effectively evaluate the performance of the drill pipe connector, and has very importance significance in improving the use performance of the drill pipe connector, prolonging the service life of a drill pipe and reducing the operation cost.

Description

Technical field [0001] The invention involves the field of oil field drilling technology, especially the performance evaluation method of drilling rod joint. Background technique [0002] Drilling rods are the main tools for transmitting power and transporting drilling fluids. They play an important role in the drilling process of oil and gas fields. Drilling rod failure accidents often bring huge economic losses to oil fields.According to the statistical analysis of the drilling column failure accident, 65%of the failure accident occurred at the drilling rod joint.The stress distribution state of the drill rod joint directly determines the connection strength and sealing performance of the drill rod.Therefore, research on the stress distribution of drill rod joints is the key to improving the performance of drill rods. [0003] At present, most researchers generally use the two -dimensional axis symmetrical finite element analysis to analyze the stress of the drill rod joint to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/007
Inventor 狄勤丰陈锋袁鹏斌王文昌
Owner SHANGHAI UNIV
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