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Thermal production well casing tubular column total strain calculating method

A calculation method and casing string technology, applied in the field of drilling and oil production, can solve problems such as the inability to meet the needs of oilfield field operations, and achieve the effect of ensuring safe use

Active Publication Date: 2014-03-26
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the design of the pipe string based solely on the calculation of stress intensity cannot meet the needs of oilfield field operations.

Method used

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  • Thermal production well casing tubular column total strain calculating method
  • Thermal production well casing tubular column total strain calculating method
  • Thermal production well casing tubular column total strain calculating method

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Embodiment Construction

[0011] see figure 1 , a method for calculating the total strain of a casing string in a thermal recovery well provided in an embodiment of the present invention includes the following steps:

[0012] Step 1, calculate the total axial stress σ z . by formula The total axial stress is obtained; among them, the casing material Poisson's ratio μ, the casing inner diameter r 1 , casing outer diameter r 2 , internal pressure p pi , external pressure p po , the axial stress σ generated by the pipe’s own weight a , the bending stress σ caused by the dogleg degree b , the thermal stress σ generated by the temperature change T .

[0013] Step 2, calculate the axial deformation of the pipe string ε according to the total axial stress z . The formula for calculating the axial deformation of the pipe string is ϵ z = σ z ...

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Abstract

The invention discloses a thermal production well casing tubular column total strain calculating method, and belongs to the technical field of well drilling and oil recovery. The method comprises the following steps that the total axial stress is calculated; tubular column axial deformation is calculated through the total axial stress; tubular column creep deformation is calculated; the tubular column axial deformation and the tubular column creep deformation are added together to obtain thermal production well casing tubular column total strain. According to the thermal production well casing tubular column total strain calculating method, the thermal production well casing tubular column total strain is obtained, whether a thermal production well casing tubular column is in the pipe evenly-extending rate range or not can be accurately judged, and using safety is ensured.

Description

technical field [0001] The invention relates to the technical field of drilling and oil production, in particular to a method for calculating the total strain of casing strings in thermal recovery wells. Background technique [0002] At present, the design method of thermal recovery well casing string adopts the strength design method, which is mainly based on the calculation of the load stress on the string, and the obtained total stress value does not exceed the yield strength of the pipe as a qualified design. Based on the theory and considering the thermal stress in the process of thermal recovery, the pipe will not yield under high temperature conditions. However, the casing damage forms such as deformation, necking, shearing, and fracture of heavy oil thermal recovery wells fully demonstrate that the plastic deformation of the tubing has indeed occurred during service, and it is the different plastic deformations that cause the permanent deformation of the tubing, and ...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 王建军韩礼红王航
Owner BC P INC CHINA NAT PETROLEUM CORP
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