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Class Information
Number: 175/25
Name: Boring or penetrating the earth > Automatic control > Of fluid pressure below ground
Description: Subject matter in which a sensed condition of operation controls a power operated means to adjust or regulate the pressure of fluid which is (1) within a borehole or (2) confined in apparatus in which the fluid pressure may be automatically adjusted or modified while the confining apparatus is within a borehole.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7264058 |
Arrangement and method for regulating bottom hole pressures when drilling deepwater offshore wells |
Sep. 4, 2007 |
| 7255173 |
Instrumentation for a downhole deployment valve |
Aug. 14, 2007 |
| 7172037 |
Real-time drilling optimization based on MWD dynamic measurements |
Feb. 6, 2007 |
| 7114576 |
Method and arrangement of controlling of percussive drilling based on the stress level determined from the measured feed rate |
Oct. 3, 2006 |
| 7111692 |
Apparatus and method to reduce fluid pressure in a wellbore |
Sep. 26, 2006 |
| 7103521 |
Method and device for neutralizing, by controlled gas injection, the formation of liquid slugs at the foot of a riser connected to a multiphase fluid transport pipe |
Sep. 5, 2006 |
| 7096975 |
Modular design for downhole ECD-management devices and related methods |
Aug. 29, 2006 |
| 7090033 |
Drill string shutoff valve |
Aug. 15, 2006 |
| 7055627 |
Wellbore fluid circulation system and method |
Jun. 6, 2006 |
| 6987463 |
Method for collecting geological data from a well bore using casing mounted sensors |
Jan. 17, 2006 |
| 6968911 |
Apparatus and methods for drilling |
Nov. 29, 2005 |
| 6920942 |
Method and apparatus for directly controlling pressure and position associated with an adjustable choke apparatus |
Jul. 26, 2005 |
| 6868920 |
Methods and systems for averting or mitigating undesirable drilling events |
Mar. 22, 2005 |
| 6854532 |
Subsea wellbore drilling system for reducing bottom hole pressure |
Feb. 15, 2005 |
| 6837313 |
Apparatus and method to reduce fluid pressure in a wellbore |
Jan. 4, 2005 |
| 6755261 |
Method and system for controlling well fluid circulation rate |
Jun. 29, 2004 |
| 6747570 |
Method for preventing fracturing of a formation proximal to a casing shoe of well bore during drilling operations |
Jun. 8, 2004 |
| 6719071 |
Apparatus and methods for drilling |
Apr. 13, 2004 |
| 6668943 |
Method and apparatus for controlling pressure and detecting well control problems during drilling of an offshore well using a gas-lifted riser |
Dec. 30, 2003 |
| 6648081 |
Subsea wellbore drilling system for reducing bottom hole pressure |
Nov. 18, 2003 |
| 6637522 |
Enhanced computer control of in-situ drilling system |
Oct. 28, 2003 |
| 6575244 |
System for controlling the operating pressures within a subterranean borehole |
Jun. 10, 2003 |
| 6527062 |
Well drilling method and system |
Mar. 4, 2003 |
| 6484816 |
Method and system for controlling well bore pressure |
Nov. 26, 2002 |
| 6474422 |
Method for controlling a well in a subsea mudlift drilling system |
Nov. 5, 2002 |
| 6415877 |
Subsea wellbore drilling system for reducing bottom hole pressure |
Jul. 9, 2002 |
| 6394195 |
Methods for the dynamic shut-in of a subsea mudlift drilling system |
May. 28, 2002 |
| 6374925 |
Well drilling method and system |
Apr. 23, 2002 |
| 6352129 |
Drilling system |
Mar. 5, 2002 |
| 6289998 |
Downhole tool including pressure intensifier for drilling wellbores |
Sep. 18, 2001 |
| 6209661 |
Method and arrangement for controlling feed in rock drilling |
Apr. 3, 2001 |
| 6102138 |
Pressure-modulation valve assembly |
Aug. 15, 2000 |
| 5873420 |
Air and mud control system for underbalanced drilling |
Feb. 23, 1999 |
| 5443128 |
Device for remote actuating equipment comprising delay means |
Aug. 22, 1995 |
| 5437308 |
Device for remotely actuating equipment comprising a bean-needle system |
Aug. 1, 1995 |
| 5303582 |
Pressure-transient testing while drilling |
Apr. 19, 1994 |
| 4930586 |
Hydraulic drilling apparatus and method |
Jun. 5, 1990 |
| 4924949 |
Drill pipes and casings utilizing multi-conduit tubulars |
May. 15, 1990 |
| 4788467 |
Downhole oil well vibrating system |
Nov. 29, 1988 |
| 4700739 |
Pneumatic well casing pressure regulating system |
Oct. 20, 1987 |
| 4653597 |
Method for circulating and maintaining drilling mud in a wellbore |
Mar. 31, 1987 |
| 4630675 |
Drilling choke pressure limiting control system |
Dec. 23, 1986 |
| 4577614 |
Advanced quick ball release sub |
Mar. 25, 1986 |
| 4509593 |
Downhole mobility and propulsion apparatus |
Apr. 9, 1985 |
| 4458766 |
Hydrojet drilling means |
Jul. 10, 1984 |
| 4403664 |
Earth boring machine and method |
Sep. 13, 1983 |
| 4337653 |
Blowout preventer control and recorder system |
Jul. 6, 1982 |
| 4291772 |
Drilling fluid bypass for marine riser |
Sep. 29, 1981 |
| 4253530 |
Method and system for circulating a gas bubble from a well |
Mar. 3, 1981 |
| 4149603 |
Riserless mud return system |
Apr. 17, 1979 |
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