Controlling the Pressure within an Annular Volume of a Wellbore
AssigneesChevron U.S.A. Inc., Los Alamos National Security, LLC
InventorsRobert E. Hermes, Manuel E. Gonzalez, Brian C. Llewellyn, James B. Bloys, Don M. Coates
Life of this patent
Estimating the term…
Abstract
A process is described for replacing at least a portion of the liquid within the annular volume of a casing system within a wellbore with a second liquid. The second liquid is preselected to provide a measure of control of the pressure within the annular volume as the fluid within the volume is being heated.
Claims21
A process for controlling the pressure within a confined volume comprising:
- providing a volume containing a first fluid having a first pressure and a first temperature within the volume;
- replacing at least a portion of the first fluid within the volume with a second fluid comprising a porous foam material;
- sealing the volume to produce a confined volume;
- heating the fluid within the confined volume, such that the fluid is at a second pressure and at a second temperature;
- wherein the second fluid is preselected such that the second pressure is lower than had the confined volume contained the first fluid only at the second temperature.
-14. (canceled)
-29. (canceled)
A process for controlling the pressure within the casing structure of a wellbore, comprising:
- a) providing an annular volume described by two casing strings within a wellbore and containing a first fluid having a first pressure and a first temperature at a selected location within the annular volume;
- b) replacing at least a portion of the first fluid within the annular volume with a second fluid comprising a porous foam material;
- c) sealing the annular volume to produce a confined volume;
- d) heating the fluid within the confined volume, such that the fluid at the selected location is at a second pressure and at a second temperature;
- wherein the second fluid is preselected such that the second pressure at the selected location is lower than the pressure at the selected location within the confined volume would have been had the confined volume contained the first fluid only at the second temperature.
A process for controlling the pressure within the casing structure of a wellbore, comprising:
- a) providing an annular volume described by two casing strings within a wellbore and containing a first fluid having a first maximum pressure at a first temperature within the annular volume;
- b) replacing at least a portion of the first fluid within the annular volume with a second fluid comprising a porous foam material;
- c) sealing the annular volume to produce a confined volume;
- d) heating the fluid within the confined volume to an elevated temperature relative to the first temperature, such that at least a portion of the fluid is at a second maximum pressure;
- wherein the second fluid is preselected such that the second maximum pressure is lower than the maximum pressure within the confined volume would have been had the confined volume contained the first fluid only at the elevated temperature.
A process for controlling the pressure within a confined volume comprising:
- a) providing at a first pressure and at a first temperature a volume containing a first fluid and a second fluid comprising a porous foam material;
- b) sealing the volume to produce a confined volume;
- c) heating the first fluid and the second fluid within the confined volume, such that the first fluid and the second fluid are at a second pressure and at a second temperature;
- wherein the second fluid is preselected such that the second pressure is lower than had the confined volume contained the first fluid only at the second temperature.
-42. (canceled)
Dependencies are inferred from the claim text.