Wellbore annular pressure control system and method using accumulator to maintain back pressure in annulus

a control system and annulus technology, applied in the direction of earth drilling, fluid removal, borehole/well accessories, etc., can solve the problems of increasing the duty cycle and increasing the size of the primary pump
US20100186960A1Inactive Publication Date: 2010-07-29SMITH INT INC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
SMITH INT INC
Publication Date
2010-07-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

A system for controlling wellbore annulus pressure during the drilling of a subterranean formation includes a drill string extending into a wellbore. A primary pump is configured for selectively pumping a drilling fluid through the drill string and into an annular space created between the drill string and the wellbore. A fluid discharge conduit is in fluid communication with the annular space for discharging the drilling fluid to a reservoir. A fluid back pressure system is connected to the fluid discharge conduit configured to selectively maintain pressure therein. The fluid back pressure system includes a fluid choke, a back pressure source and an accumulator hydraulically coupled between the back pressure source and the discharge conduit.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] Priority is claimed from U.S. Provisional Application No. 61 / 148,083 filed Jan. 29, 2009.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OF DEVELOPMENT

[0002] Not applicable.BACKGROUND OF THE INVENTION

[0003] 1. Field of the Invention

[0004] The invention relates generally to the field of wellbore drilling using annular pressure control systems. More specifically, the invention relates to back pressure systems including an accumulator to maintain back pressure.

[0005] 2. Background Art

[0006] U.S. Pat. No. 6,904,891 issued to van Riet and commonly owned with the present invention describes a system for controlling formation pressure during the drilling of a wellbore through subterranean formations. The system includes a drill string extending into the wellbore. The drill string typically includes a bottom hole assembly made up of a drill bit, sensors, and a telemetry system capable of receiving and transmitting sensor data. Sensors disposed in the...

Claims

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