A design method and device for a casing wellhead annulus pressure prevention tool

An annulus under pressure and casing technology, which is applied in design optimization/simulation, calculation, special data processing applications, etc., can solve the problems of little research progress and cannot meet the problem of wellhead annulus under pressure, and improve strain coordination ability, inhibiting gas well wellhead annulus pressure, and improving the effect of gas sealing ability

Active Publication Date: 2019-04-19
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although domestic scholars also try to solve the above problems through the finite element method, the existing research has made little progress in the study of the strain coordination force between the casing and the cement sheath, which cannot meet the needs of solving the problem of pressure in the wellhead annulus

Method used

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  • A design method and device for a casing wellhead annulus pressure prevention tool
  • A design method and device for a casing wellhead annulus pressure prevention tool
  • A design method and device for a casing wellhead annulus pressure prevention tool

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Effect test

Embodiment 1

[0055] see figure 1 It is a schematic flowchart of a design method of a casing wellhead annulus prevention tool provided in Embodiment 1 of the present invention. The method includes the following steps:

[0056] S11. Establish a finite element analysis model composed of casing, coating material, cement sheath and formation in the downhole of the gas well;

[0057] Wherein, in the gas well, the coating material is located between the casing and the cement sheath, and the cement sheath is located between the coating material and the formation.

[0058] It should be noted that the main purpose of gas well cementing and cementing operations is to effectively isolate the casing outer annulus to prevent formation fluid channeling during gas well drilling, stimulation operations and production; and to form a complete cement sheath to effectively support and protective sleeve. During the drilling and development of gas wells, the cement sheath is subject to such effects as casing i...

Embodiment 2

[0065] Referring to embodiment one of the present invention and figure 1 For the specific process of steps S11 to S13 described in , see figure 2 Corresponding to the second embodiment of the present invention figure 1 A schematic flow chart of establishing a finite element analysis model in the step S11 shown, specifically including:

[0066] S111. Establish a three-dimensional geometric model composed of casing, coating material, cement sheath and formation according to the casing size actually used and the measured borehole expansion ratio;

[0067] S112. Define physical parameters of each component of the three-dimensional geometric model;

[0068] Specifically, according to the actual downhole working conditions of on-site drilling, the physical property parameters and cement sheath failure criteria of each component in the established three-dimensional ensemble model are defined. Wherein, the coating material parameter range includes but is not limited to the effecti...

Embodiment 3

[0092] Corresponding to the design method of the casing wellhead annulus prevention tool disclosed in the first and second embodiments of the present invention, the third embodiment of the present invention also provides a design device for the casing wellhead annulus prevention tool, see Figure 5 It is a structural schematic diagram of a device for designing a casing wellhead annulus prevention tool provided in Embodiment 3 of the present invention, and the device includes:

[0093] Establishment module 1, used to establish a finite element analysis model composed of casing, coating material, cement sheath and formation in the downhole of the gas well, wherein, in the gas well, the coating material is located on the casing and the Between the cement sheath, the cement sheath is located between the coating material and the formation;

[0094] The calculation module 2 is used to analyze the parameters related to the performance of the coating material in the finite element an...

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Abstract

The invention discloses a design method and device for a casing wellhead annulus pressure prevention tool. The method comprises the steps: establishing a finite element analysis model composed of a casing, a coating material, a cement sheath and a stratum under a gas well; Analyzing parameters related to the performance of the coating material in the finite element analysis model, and performing calculating to obtain a material parameter design range which meets the parameter range of gas well pressure test and fracturing for keeping the sealing performance of the cement sheath; And in the material parameter design range, designing and obtaining the casing wellhead annulus pressure prevention tool. The purpose of restraining the annulus belt pressure of the wellhead of the gas well is achieved by keeping the sealing integrity of the cement sheath and reducing the micro annulus.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a design method and device for a casing wellhead annular pressure prevention tool. Background technique [0002] In the process of oil and gas exploration and development, the problem of pressure in the wellhead annulus between casings has become increasingly prominent. There are many factors that cause annular pressure, such as poor cementing quality, pressure change or temperature change, etc., but the structural damage of cement sheath or the appearance of gaps are one of the key factors that cause annular pressure. When there is large-scale fracturing production in a gas well, the high pressure will cause irreversible radial plastic deformation of the cement sheath, that is, after the pressure is unloaded, an annulus will appear on the first cemented surface between the casing and the cement sheath, resulting in gas channeling and annulus The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 侯树刚兰凯李帮民杨玄王旭明龚媛
Owner 中石化石油工程技术服务有限公司
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