Method for quickly evaluating tensile property of degradation drill rod joint

A technology for drill pipe joints and evaluation methods, applied in special data processing applications, instruments, electrical digital data processing, etc.

Inactive Publication Date: 2017-01-18
SHANGHAI UNIV
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the current method for evaluating the mechanical properties of downgraded drill pipe joints under complex load conditions, the purpose o

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for quickly evaluating tensile property of degradation drill rod joint
  • Method for quickly evaluating tensile property of degradation drill rod joint
  • Method for quickly evaluating tensile property of degradation drill rod joint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0031] Example: The tensile strength of a degraded drill pipe joint is determined using a rapid evaluation method for the tensile performance of a degraded drill pipe joint.

[0032] Using this evaluation method to evaluate a degraded drill pipe joint (NC38), its main structural parameters are shown in Table 1.

[0033]

[0034] Use CAD geometric modeling software to establish a three-dimensional geometric model of the downgraded drill pipe joint, such as figure 2 shown. Use the finite element pre-processing software to mesh the degraded drill pipe joint, and establish its three-dimensional finite element model, as shown in image 3 shown.

[0035] The material used for the drill pipe joint is an isotropic elastoplastic material with an elastic modulus of 2.06×10 5 MPa, Poisson's ratio is 0.29, and the true stress-plastic strain data of the material are shown in Table 2. Considering the influence of thread grease containing 40-60% by weight of zinc powder, the coeffici...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method for quickly evaluating the tensile property of a degradation drill rod joint. The method comprises the following steps: performing grid division on a degradation drill rod joint three-dimensional geometric model by using finite element pre-processing software on the basis of measuring a geometric structure parameter of the degradation drill rod joint and a mechanical property parameter of a material by using a special tool or facility, building the degradation drill rod joint three-dimensional geometric model, performing calculation by using nonlinear finite element analysis software ABAQUS to obtain a three-dimensional stress characteristic of the degradation drill rod joint under the action of a complicated load. On the basis of the three-dimensional stress characteristic, the tensile strength of the degradation drill rod joint can be calculated. The evaluation method can be used for evaluating the tensile property of the degradation drill rod joint under the action of a complicated external load such as a make up torque and an axial tension so as to evaluate the safety of the degradation drill rod joint. The method has very important significance for recognition of a load limit of the degradation drill rod joint, instruction for the use of the degradation drill rod joint and guarantee of the working safety of drilling.

Description

technical field [0001] The invention relates to the technical field of oil field drilling, in particular to a method for quickly evaluating the tensile performance of a degraded drill pipe joint. Background technique [0002] The drill pipe joint is the weak link of the drill string. It is prone to wear to varying degrees during use, which makes the wall thickness thinner and affects the strength of the joint. The API standard gives the classification basis for the drill pipe body and joints, but does not give the tensile strength of the degraded drill pipe joints. With the number of deep wells, ultra-deep wells and extended-reach horizontal wells increasing year by year, the tensile properties of drill tool joints have received more and more attention. Therefore, there is a great need for a rapid evaluation method that can effectively determine the tensile properties of degraded drill pipe joints. [0003] The experimental method is a reliable method for evaluating the co...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23
Inventor 狄勤丰陈锋王文昌冯少波张鹤陈薇
Owner SHANGHAI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap