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Method for analyzing mechanical strength of slotted casing

A technology of mechanical strength and casing, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as casing yield, downhole safety accidents, casing plastic deformation, etc.

Active Publication Date: 2018-03-30
BC P INC CHINA NAT PETROLEUM CORP +2
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Problems solved by technology

[0003] This application provides a method for analyzing the mechanical strength of the slotted casing, which can accurately obtain the mechanical strength value of the slotted casing, thereby providing a basic theoretical method for the design and safety assessment of the slotted casing, and then solve the problems in the prior art. When the external load exceeds the yield strength of the casing, the casing will undergo plastic deformation, leading to technical problems such as casing yield and downhole safety accidents

Method used

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  • Method for analyzing mechanical strength of slotted casing
  • Method for analyzing mechanical strength of slotted casing

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Embodiment 1

[0033] This application provides a numerical calculation method for the mechanical strength of slotted casing, such as figure 1 shown, including:

[0034] Step S110: preparing a slotted casing test piece.

[0035] In the specific implementation process, such as figure 2 As shown, the slotted casing test piece refers to: the 12-meter-long slotted casing of the entire pipe length is cut into a 1-meter-long slotted casing test piece, and the slotted casing made by the method is located at the In the middle, both ends of the specimen are flat and free of deformation, ensuring that the stress state during the casing test is consistent with that of the entire pipe.

[0036] In the specific implementation process, slotted casing test pieces with different lengths can be prepared.

[0037] Step S120: Acquiring characteristic physical and mechanical parameters of the slotted casing test piece.

[0038] In the specific implementation process, the physical and mechanical parameters ...

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Abstract

The invention discloses a method for analyzing mechanical strength of a slotted casing. The method comprises the steps of preparing a slotted casing test-piece; obtaining physical and mechanics parameters of characteristics of the slotted casing test-piece; applying different loads on the slotted casing test-piece in the axial and radial directions; controlling load size, load time and load numberof times of the loads; obtaining a change rule curve of load-time, a change rule curve of stress-strain, and a change rule curve of load-displacement of the slotted casing test-piece; according to the curves above, establishing a mechanical strength-transformation theoretical model and a mechanical strength-load theoretical model of the slotted casing test-piece; embedding the models above into auniversal finite element model, based on minimum yield strength of the slotted casing test-piece, establishing a three-dimensional numerical calculation model of the mechanical strength of the slotted casing test-piece under stress load, therefore calculating and analyzing the mechanical strength characteristics of homogeneous pipe length slotted casing under different load acting forces, and obtaining the results of the mechanical strength characteristics of homogeneous pipe length slotted casing.

Description

technical field [0001] The invention relates to the technical field of marine engineering, in particular to a method for analyzing the mechanical strength of a slotted casing. Background technique [0002] Hydraulic sand blasting slotted casing can improve the seepage conditions in the near-well zone of oil and gas wells, increase the production of oil and gas wells, and is suitable for oil and gas wells to remove plugging, increase production and increase injection. After the complete casing is slotted, it will be affected by the casing's own weight, wellhead rotation, and formation creep during downhole operations, which will generate additional stress and cause elastic deformation of the slotted casing. With the continuous accumulation of additional stress, when When the minimum yield strength of the casing is exceeded, the slotted casing will change from elastic deformation to plastic deformation, and this drastic buckling change can directly lead to casing yield and dow...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23G06F2113/14G06F2119/06
Inventor 淳明浩杨肖迪罗小桥徐爽刘振纹张宁馨张月超
Owner BC P INC CHINA NAT PETROLEUM CORP
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