Bent casing pipe non-uniform collapse strength simulation test method and device

A test method, non-uniform technology, applied in the direction of applying stable tension/compression to test material strength, etc., can solve problems such as lack of accuracy and reliability, failure to consider the impact of casing collapse strength, test data verification, etc.

Inactive Publication Date: 2016-02-24
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, only some scholars have theoretically studied the casing collapse strength under non-uniform loads. Influence of moment on the collapse strength of casing under non-uniform load

Method used

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  • Bent casing pipe non-uniform collapse strength simulation test method and device

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Embodiment Construction

[0017] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0018] The present invention utilizes the thrust bearing and the right fixture (the right fixture can reciprocate up and down under the action of the thrust bearing.) to apply an additional bending moment to the casing fixed by the left fixture and the bracket, so that the casing bends and produces a certain dogleg degree , using the front moving indenter and the rear moving indenter of the pressure testing machine to apply non-uniform loads to the curved casing, and at the same time record the casing strain under different external loads through the strain gauges and strain gauges on the outer wall of the casing, and draw based on the test data The relationship curve between non-uniform load and casing strain can be calculated to obtain the non-uniform collapse strength of the casing under the dogleg degree, and the non-uniform collapse strength of the casing under d...

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Abstract

The invention discloses a bent casing pipe non-uniform collapse strength simulation test method and device. Through a thrust bearing and a right clamp, additional bending moment is applied for a casing pipe fixed by a left clamp and a support, the right clamp produces up-down reciprocating motion under the action of the thrust bearing so that the casing pipe is bent and produces a certain overall angle change rate, through a front movement pressure head and a rear movement pressure head of a compression-testing machine, non-uniform load is applied for the bent casing pipe, the casing pipe strains under different loads are recorded by a strain gage and a strain meter on the outer wall of the casing pipe, based on the test data, a relationship curve of the non-uniform loads and the casing pipe strains is drawn, non-uniform collapse strength of the casing pipe at the overall angle change rate is calculated, and through change of the overall angle change rate, non-uniform collapse strength values of the casing pipe at different overall angle change rates are obtained. The test method and device are suitable for test and research of non-uniform collapse strength of a casing pipe in a crooked hole.

Description

technical field [0001] This patent relates to the technical field of oil and natural gas drilling engineering, in particular to a test method and device for simulating the non-uniform collapse strength of a curved casing. technical background [0002] In the oil and gas drilling and production process, oil casing plays the role of protecting the wellbore, strengthening the well wall, isolating the oil, gas and water layers in the well and sealing various complex formations. Field failure data show that casings designed in accordance with API standards still deform and even collapse in plastic creep formations and formations with large dip angles, such as Longgang 001-1, Longgang 001-2, and Longgang 39 wells in the Sichuan-Chongqing gas field. Well, Well Longgang 13, Well Puguang 204-2H, Well Yingshen No. 1 in Tarim Oilfield, and Well TK1127 in Tahe Oilfield all belong to the non-uniform collapse of salt rock formations. The strength design does not consider the reduction of...

Claims

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Application Information

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IPC IPC(8): G01N3/12
CPCG01N3/12
Inventor 邓宽海林元华曾德智刘婉颖王锦昌王其军仝闯闯周禄江李佳莲韩礼红
Owner SOUTHWEST PETROLEUM UNIV
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