Pressure Safety System for Use With a Dynamic Annular Pressure Control System

a control system and annular pressure technology, applied in the direction of drilling machines and methods, wellbore/well accessories, chemistry apparatus and processes, etc., can solve the problems of drilling fluid loss, fissures or fractures in formation, and fluid entering into the formation pores,
US20070246263A1Inactive Publication Date: 2007-10-25AT BALANCE AMERICAS
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
AT BALANCE AMERICAS
Publication Date
2007-10-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method for controlling formation pressure during the drilling of a borehole through a subterranean formation includes selectively pumping a drilling fluid through a drill string extended into a borehole, out a drill bit at the bottom end of the drill string, and into an annular space between drill string and the borehole. The drilling fluid is discharged to a reservoir to clean the drilling fluid for reuse. Annular space fluid pressure is selectively increased to maintain a selected fluid pressure proximate the bottom of the borehole by applying fluid pressure to the annular space. The selective increasing includes controlling an aperture of an orifice operatively coupled between the annular space and the reservoir. Fluid from the annular space is discharged other than through the orifice when the annular space fluid pressure exceeds a selected value, or drops below a selected value.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] Priority is claimed from U.S. Provisional Application No. 60 / 793,488 filed on Apr. 20, 2006.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

[0002] Not applicable.BACKGROUND OF THE INVENTION

[0003] 1. Field of the Invention

[0004] The invention relates generally to the field of drilling boreholes using dynamic annular pressure control devices. More specifically, the invention relates to method for determining borehole fluid control events, such as loss of drilling fluid or formation fluid entry into a borehole when such devices are used.

[0005] 2. Background Art

[0006] The exploration for and production of hydrocarbons from subsurface Earth formations ultimately requires a method to reach and extract the hydrocarbons from the formations. The reaching and extracting are typically performed by drilling a borehole from the Earth's surface to the hydrocarbon-bearing Earth formations using a drilling rig. In its simplest form, a land-base...

Claims

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