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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:
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Patent Number Title Of Patent Date Issued
8689906 Methods and apparatus for reducing stick-slip Apr. 8, 2014
8684109 Drilling method for drilling a subterranean borehole Apr. 1, 2014
8657034 Method of drilling a subterranean borehole Feb. 25, 2014
8629895 Camera-based facial recognition or other single/multiparty presence detection as a method of effecting telecom device alerting Jan. 14, 2014
8528660 System and method for safe well control operations Sep. 10, 2013
8490719 Method and apparatus for controlling bottom hole pressure in a subterranean formation during rig pump operation Jul. 23, 2013
8453760 Method and apparatus for controlling bottomhole temperature in deviated wells Jun. 4, 2013
8448720 Optimized pressure drilling with continuous tubing drill string May. 28, 2013
8378842 Downhole component with an electrical device in a blind-hole Feb. 19, 2013
8360170 Method of drilling a subterranean borehole Jan. 29, 2013
8347983 Drilling with a high pressure rotating control device Jan. 8, 2013
8322439 Arrangement and method for regulating bottom hole pressures when drilling deepwater offshore wells Dec. 4, 2012
8281875 Pressure and flow control in drilling operations Oct. 9, 2012
8267197 Apparatus and methods for controlling bottomhole assembly temperature during a pause in drilling boreholes Sep. 18, 2012
8201628 Wellbore pressure control with segregated fluid columns Jun. 19, 2012
8151904 Method for improved well control with a downhole device Apr. 10, 2012
8146681 Drilling tool and drilling method Apr. 3, 2012
8136609 Multiple input scaling autodriller Mar. 20, 2012
8132630 Reverse circulation pressure control method and system Mar. 13, 2012
8118114 Closed-loop control of rotary steerable blades Feb. 21, 2012
RE43199 Arrangement and method for regulating bottom hole pressures when drilling deepwater offshore wells Feb. 21, 2012
8011450 Active bottomhole pressure control with liner drilling and completion systems Sep. 6, 2011
7984770 Method for determining formation integrity and optimum drilling parameters during drilling Jul. 26, 2011
7967081 Closed-loop physical caliper measurements and directional drilling method Jun. 28, 2011
7958948 Method and system for return of drilling fluid Jun. 14, 2011
7954558 Devices and methods for power control in horizontal directional drilling Jun. 7, 2011
7921936 Method and system for controlling an excavating apparatus Apr. 12, 2011
7836973 Annulus pressure control drilling systems and methods Nov. 23, 2010
7828081 Method of drilling a lossy formation Nov. 9, 2010
7806203 Active controlled bottomhole pressure system and method with continuous circulation system Oct. 5, 2010
7789201 Gear unit and method for controlling an internal pressure in the gear unit Sep. 7, 2010
7775299 Method and apparatus for programmable pressure drilling and programmable gradient drilling, and completion Aug. 17, 2010
7775297 Multiple input scaling autodriller Aug. 17, 2010
7721822 Control systems and methods for real-time downhole pressure management (ECD control) May. 25, 2010
7623961 Method for determining a track of a geographical trajectory Nov. 24, 2009
7562723 Method for determining formation fluid entry into or drilling fluid loss from a borehole using a dynamic annular pressure control system Jul. 21, 2009
7546876 Method and apparatus for jet-fluid abrasive cutting Jun. 16, 2009
7539548 Smart-control PLC based touch screen driven remote control panel for BOP control unit May. 26, 2009
7500529 Method and apparatus for predicting and controlling secondary kicks while dealing with a primary kick experienced when drilling an oil and gas well Mar. 10, 2009
7464770 Closed-loop control of hydraulic pressure in a downhole steering tool Dec. 16, 2008
7407019 Method of dynamically controlling open hole pressure in a wellbore using wellhead pressure control Aug. 5, 2008
7395877 Apparatus and method to reduce fluid pressure in a wellbore Jul. 8, 2008
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

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