Pressure responsive centralizer

a centralizer and pressure technology, applied in the direction of drilling casings, wellbore/well accessories, pipes, etc., can solve the problems of high induced pressure, pressure has been known to be a significant factor in the failure of subsea wells, and annular pressure buildup in wellbores, so as to reduce apb, enhance casing products, and increase casing capacity

Inactive Publication Date: 2006-11-02
HALLIBURTON ENERGY SERVICES INC
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  • Abstract
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  • Claims
  • Application Information

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Benefits of technology

[0016] A final way of mitigating APB is by using enhanced casing products. Increased casing capacities can accommodate a higher degree of pressure buildup without detrimental effects to the casing or well. Extensive work has been applied here also involving advanced, probabilistic performance properties of the subject casings.
[0017] The present inventions describe methods and systems for controlling pressure and volume variations in boreholes. For example, in one embodiment an innovative centralizer comprises a centralizing structure with at least one sealed hollow structural component where a rupture disk is capable of breaking in response to sufficient pressure. The present innovations further t

Problems solved by technology

Annular pressure buildup within wellbores has been recognized in the oil and gas industry for many years as a serious problem.
This pressure has been known to be a significant factor in the failure of subsea wells, including Well A-2 of British Petroleum 1999 Marlin development program in the deepwater program off the Gulf of Mexico.
When wellbore fluids heat up and expand in a closed system, the expansion causes high induced pressures.
Consequently, bleeding the outer annuli may n

Method used

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Embodiment Construction

[0029] The numerous innovative teachings of the present application will be described with particular reference to the presently preferred embodiment (by way of example, and not of limitation).

[0030] The disclosed inventions take advantage of a new way in which the pressure in boreholes can be controlled. In one embodiment, a centralizer is combined with a rupture disk to allow for the release of excess pressure from a wellbore. The hollow components in this embodiment contain a burst disk or rupture disk, which are selected to rupture at a predetermined pressure as required by well hydrostatic pressure and other factors. The inside and outside diameters of the centralizer preferably provide effective centering of the casing in the borehole or outer casing. The number of struts and rupture and burst disks may be adjusted in such a way as to meet the specific pressure and volume needs of a specific project. For instance, in one embodiment, there may be six struts with one rupture di...

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Abstract

A centralizer including hollow structural components. In at least one embodiment, the hollow structural component is sealed by at least one valve or rupture disk. When unacceptable overpressures occur, the valve or rupture disks break to allow influx into the hollow element, thereby relieving pressure and avoiding damage that might otherwise occur. In other embodiments, the hollow structural component collapses to expand available volume.

Description

FIELD OF THE INVENTION [0001] The present invention relates to systems and methods for controlling pressure in wellbores. BACKGROUND AND SUMMARY OF THE INVENTION Background: Pressure in Well [0002] Annular pressure buildup within wellbores has been recognized in the oil and gas industry for many years as a serious problem. Fluids trapped in a wellbore or annular space in a wellbore will expand with a corresponding increase in temperature leading to a volume increase and increase in the force they exert upon the surrounding area. This pressure has been known to be a significant factor in the failure of subsea wells, including Well A-2 of British Petroleum 1999 Marlin development program in the deepwater program off the Gulf of Mexico. One relevant article is Practical and Successful Prevention of Annular Pressure Buildup on the Marlin Project, SPE International 77473, 2002, Richard F. Vargo, Jr., et al, and which is hereby incorporated by reference in its entirety. Background: Annula...

Claims

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Application Information

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IPC IPC(8): E21B17/10
CPCE21B17/1078E21B41/00E21B34/063
Inventor FAUL, RONALD R.
Owner HALLIBURTON ENERGY SERVICES INC
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