Method and device for simulating multi-rush fracture toughness of well drilling working condition

A technology of fracture toughness and testing device, which is applied in the direction of applying repetitive force/pulsation force to test the strength of materials, which can solve problems such as inability to simulate, and achieve the effects of ensuring test accuracy, low price, and easy maintenance in the later period.

Inactive Publication Date: 2012-01-04
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0009] The purpose of the present invention is to provide a multi-stroke fracture toughness test method and device under simulated drilling conditions, so as to solve the problem that the current material multi-stroke fracture toughness test method cannot simulate drilling conditions and perform low-load multi-stroke in line with the vibration characteristics of the drill string. The technical difficulties of testing, and while achieving the above goals, simplify the system complexity and reduce the cost of equipment

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  • Method and device for simulating multi-rush fracture toughness of well drilling working condition
  • Method and device for simulating multi-rush fracture toughness of well drilling working condition
  • Method and device for simulating multi-rush fracture toughness of well drilling working condition

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Embodiment Construction

[0024] The invention utilizes the rotation characteristics of the rotating body to make the test piece fixed on the outer edge of the rotating body strike the anvil board adjacent to the rotating body outside the rotating body with a certain period, so as to achieve the low-load multi-stroke fracture toughness test experiment in accordance with the vibration characteristics of the drill string purpose.

[0025] In order to use the above method, the test device provided by the present invention mainly includes: a base 10, a speed-regulating motor 7, a transmission device A, a mud tank 3, an anvil 2, a rotating main plate 4, and a test piece seat 1. The speed-regulating motor 7 is fixed on the base 10; the transmission device A adopts belt transmission, the power is transmitted to the large pulley 5 through the small pulley 6, the warp shaft 13 drives the rotating main plate 4 to rotate, and the large pulley 5 and the shaft 13 are connected by the key 14; The lower part of 13 is in...

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Abstract

The invention discloses a method and device for simulating the multi-rush fracture toughness of a well drilling working condition. The invention is characterized in that the rotating characteristics of a rotating body are utilized to cause a test piece fixed at the outer edge of the rotating body to attack a chopping block fixed at the outer edge surface of an adjacent rotating body at a certain period and frequency, thus the aim of carrying out a low-load multi-rush experiment in accordance with vibration characteristics of a drilling column is achieved. In the device, whether a well drilling liquid is injected into a mud groove can be optional in the test, thus the underground environment under the working conditions of a mud drilling well and an air drilling well can be simulated, and the fracture condition of a drilling column material under the underground low-load multi-rush action is truly reflected. The device has a simple structure and low manufacturing cost and can be applicable to testing and studying on multi-rush fracture toughness of the drilling column material.

Description

Technical field [0001] The invention relates to a method and a device for testing multi-stroke fracture toughness of drill string materials that simulate drilling conditions. Background technique [0002] It is inevitable that the drill string will crack during the drilling process. Through the analysis of the current drilling conditions, the main cause of downhole drill string crack propagation is drill string vibration. Its vibration characteristics are: a single impact load value is not large, but multiple accumulated energy has a large contribution to drill string failure. Therefore, to correctly evaluate the mechanism of low load and multiple impact loads on drill string cracks, and to study the correlation between low load and multiple impact fracture toughness and the mechanical properties of drill string materials, it is necessary to establish a test drill string material under the action of drilling fluid The design of a low-load, multiple-impact fracture toughness test...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/34
Inventor 林元华孙永兴施太和李强曾德智张继川王其军朱红钧朱达江周莹谢娟
Owner SOUTHWEST PETROLEUM UNIV
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