US Patent Application No: 2007/0151,762

Number of patents in Portfolio can not be more than 2000

Method for determining formation fluid entry into or drilling fluid loss from a borehole using a dynamic annular pressure control system

ALSO PUBLISHED AS: 7562723

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Abstract

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A method for controlling formation pressure during drilling includes pumping a drilling fluid through a drill string in a borehole, out a drill bit at the end of the drill string into an annular space. The drilling fluid is discharged from the annular space proximate the Earth's surface. At least one of a flow rate of the drilling fluid into the borehole and a fluid flow rate out of the annular space is measured. Pressure of the fluid in the annular space proximate the Earth's surface and pressure of the fluid proximate the bottom of the borehole are measured. Pressure of the fluid proximate the bottom of the borehole is estimated using the measured flow rate, annular space pressure and density of the drilling fluid. A warning signal is generated if difference between the estimated pressure and measured pressure exceeds a selected threshold.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SMITH INTERNATIONAL, INC.HOUSTON, TX1027

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Reitsma, Donald G Katy, TX 14 41

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
MANAGED PRESSURE OPERATIONS PTE LTD (3)
8,210,266 Drill pipe 0 2009
8,360,170 Method of drilling a subterranean borehole 0 2010
8,684,109 Drilling method for drilling a subterranean borehole 0 2011
 
SMITH INTERNATIONAL, INC. (3)
8,490,719 Method and apparatus for controlling bottom hole pressure in a subterranean formation during rig pump operation 0 2007
8,567,525 Method for determining fluid control events in a borehole using a dynamic annular pressure control system 0 2010
8,757,272 Method and apparatus for precise control of wellbore fluid flow 0 2010
 
SCHLUMBERGER TECHNOLOGY CORPORATION (2)
7,857,046 Methods for obtaining a wellbore schematic and using same for wellbore servicing 1 2006
8,757,254 Adjustment of mud circulation when evaluating a formation 0 2010
 
TRANSOCEAN OFFSHORE DRILLING (2)
7,866,399 Apparatus and method for managed pressure drilling 9 2006
8,631,874 Apparatus and method for managed pressure drilling 0 2011
 
BP CORPORATION NORTH AMERICA INC. (1)
7,950,451 Annulus mud flow rate measurement while drilling and use thereof to detect well dysfunction 3 2009
 
NCH CORPORATION (1)
7,823,656 Method for monitoring drilling mud properties 1 2009