Preserving wellbore integrity during carbon dioxide injection

Patent metadata

Field	Value
Publication number	US-12387016-B2
Application number	US-202218062659-A
Country	US
Kind code	B2
Filing date	Dec 7, 2022
Priority date	Dec 7, 2022
Publication date	Aug 12, 2025
Grant date	Aug 12, 2025

Abstract

Embodiments presented provide for a method to negate debonding of the casing from a cement in a wellbore. In one embodiment, the cement around the casing is set with a sufficiently large residual compressive stress, preventing the deboning.

First claim

What is claimed is:

1. A method of designing a wellbore with a cement residual compressive stress layer around a casing, the method comprising:
obtaining data related to an open hole log for a wellbore in a field;
performing a simulation for injection of a fluid within the field with a desired mass flow rate, a given surface temperature, and anticipated designed perforations, the simulation computing downhole temperature on the wellbore;
inferring densities of a mud and a cement slurry used within the field from a first mud specification and a first cement specification to be used with the wellbore;
estimating a value of cement shrinkage (γ c );
computing a possible extent for shrinkage of material around the wellbore based upon the value of cement shrinkage (γ c );
evaluating the wellbore with a loading to determine whether a plane stress model or a plane strain model governs a radial deformation of the wellbore;
in response to determining that the plane stress model governs the radial deformation of the wellbore, performing a first set of operations comprising:
setting a maximum brine height for the wellbore,
calculating a plane stress coefficient value,
calculating a value of stress and the radial deformation for the wellbore,
calculating a slurry height for the wellbore, and
reevaluating the maximum brine height in response to determining that the slurry height is at an upper bound or a lower bound;

in response to determining that the plane strain models governs the radial deformation of the wellbore, performing a second set of operations comprising:
setting the maximum brine height for the wellbore,
calculating a plane strain coefficient value,
calculating a value of plane stress for the wellbore,
calculating the slurry height for the wellbore, and
reevaluating the maximum brine height in response to determining that the slurry height is at the upper bound or the lower bound the bounds;

determining whether a collapse of a casing occurs for the loading based on calculated results of a governing model of the plane stress model or the plane strain model;
in response to determining that the collapse of the casing occurs, selecting one of a second casing specification and a second cement specification;
running a second simulation for injection of the fluid within the field using a selected one of the second casing specification and the second cement specification;
writing all input and calculated parameters to a non-volatile memory; and
controlling a filling of the wellbore with cement slurry and brine using the selected one of the second casing specification and the second cement specification, wherein the cement slurry is filled to the slurry height and the brine is filled to the maximum brine height.

2. The method according to claim 1 , wherein the fluid is carbon dioxide.

3. The method according to claim 1 , wherein the value of γ c is obtained experimentally.

4. The method according to claim 1 , further comprising:
setting a new maximum brine height based, at least in part, on the slurry height.

5. The method according to claim 1 , further comprising:
displaying input and calculated parameters on a monitor.

6. The method according to claim 1 , wherein, for a governance of the plane stress model, a value of stress and radial strain is estimated.

7. The method according to claim 1 , wherein, for a governance of the plane strain model, a value of stress and radial strain is estimated.

8. The method according to claim 1 , wherein the obtaining data related to an open hole log for the wellbore in the field includes a formation temperature.

9. The method according to claim 1 , wherein the obtaining data related to an open hole log for the wellbore includes specifying a mass flow rate of fluid to be pumped downhole and determining downhole fluid temperature.

10. A method of designing a wellbore with a cement residual compressive stress layer around a casing, the method comprising:
obtaining data related to an open hole log for a wellbore in a field;
performing a simulation for injection of a fluid within the field with a desired mass flow rate, a given surface temperature, and anticipated designed perforations, the simulation computing downhole temperature on the wellbore;
inferring densities of a mud and a cement slurry used within the field from a first mud specification and a first cement specification to be used with the wellbore;
estimating a value of cement shrinkage γ c ;
computing a possible extent for shrinkage of material around the wellbore based upon the value of cement shrinkage (γ c );
evaluating the wellbore with a loading to determine whether a plane stress model or a plane strain model governs the wellbore deformation, wherein:
in response to determining that the plane stress model governs the wellbore, performing a first set of operations comprising:
setting a maximum brine height for the wellbore,
calculating a plane stress coefficient value,
calculating a value of stress and radial strain for the wellbore,
calculating height for the wellbore,
recalculating the maximum brine height in response to determining that the slurry height is at an upper bound or a lower bound; and

in response to determining that the plane strain model governs the wellbore, performing a second set of operations comprising:
setting the maximum brine height for the wellbore,
calculating a plane strain coefficient value,
calculating the value of stress and radial strain for the wellbore,
calculating the slurry height for the wellbore,
recalculating the maximum brine height in response to determining that the slurry height is at the upper bound or the lower bound;

determining whether a collapse of a casing occurs for the loading based upon a governance of the plane stress model or the plane strain model;
in an event of the collapse, selecting one of a second casing specification and a second cement specification;
running second simulation;
writing all input and calculated parameters to a non-volatile memory; and
controlling a filling of the wellbore with cement slurry and brine using a selected one of the second casing specification and the second cement specification, wherein the cement slurry is filled to the slurry height and the brine is filled to the maximum brine height.

11. The method according to claim 10 , wherein the fluid is carbon dioxide.

12. The method according to claim 10 , wherein the value of γ c is obtained experimentally.

13. The method according to claim 10 , further comprising:
displaying the input and calculated parameters on a monitor.

14. The method according to claim 10 , wherein, for a governance of the plane stress model, values of stress, and radial strain are estimated.

15. The method according to claim 10 , wherein, for a governance of the plane strain model, a value of stress, and radial strain are estimated.

16. The method according to claim 10 , wherein the obtaining data related to an open hole log for the wellbore in the field includes a formation temperature.

17. The method according to claim 10 , wherein the obtaining data related to an open hole log for the wellbore includes specifying a mass flow rate and determining downhole temperature of the fluid to be pumped downhole.

Assignees

• Schlumberger Technology Corp

Inventors

• Ramakrishnan Terizhandur S
• Morrell Daniel

Classifications

• E21B41/0064

  Carbon dioxide sequestration (storing fluids in porous layers B65G5/005) · CPC title

• E21B47/007

  Measuring stresses in a pipe string or casing (for locating blocked portions of pipes E21B47/09) · CPC title

• E21B47/07

  Temperature · CPC title

• E21B2200/20

  Computer models or simulations, e.g. for reservoirs under production, drill bits · CPC title

• E21B47/005 Primary

  Monitoring or checking of cementation quality or level · CPC title