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Class Information
Number: 175/48
Name: Boring or penetrating the earth > With signaling, indicating, testing or measuring > Measuring or indicating drilling fluid (1) pressure, or (2) rate of flow
Description: Subject matter relating to a drilling fluid system forming a part of the boring means and a step or means to (1) measure or indicate the pressure of the drilling fluid or (2) measure or indicate the rate of flow of said drilling fluid at a specified location in said system.

Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
7673705 Compartmentalized MWD tool with isolated pressure compensator Mar. 9, 2010
7660672 Method and computer program product for drilling mud design optimization to maintain time-dependent stability of argillaceous formations Feb. 9, 2010
7650950 Drilling system and method Jan. 26, 2010
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
7556104 System and method for processing and transmitting information from measurements made while drilling Jul. 7, 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
7487047 Method of interpreting well data Feb. 3, 2009
7395878 Drilling system and method Jul. 8, 2008
7383102 Slug flow protection system Jun. 3, 2008
7367411 Drilling system and method May. 6, 2008
7363988 System and method for processing and transmitting information from measurements made while drilling Apr. 29, 2008
7357197 Method and apparatus for monitoring the condition of a downhole drill bit, and communicating the condition to the surface Apr. 15, 2008
7343983 Method and apparatus for isolating and testing zones during reverse circulation drilling Mar. 18, 2008
7334651 Kick warning system using high frequency fluid mode in a borehole Feb. 26, 2008
7320370 Automatic downlink system Jan. 22, 2008
7317989 Method and apparatus for chemometric estimations of fluid density, viscosity, dielectric constant, and resistivity from mechanical resonator data Jan. 8, 2008
7316278 Method for determining drilling malfunction by correlation of drilling operating parameters and drilling response parameters Jan. 8, 2008
7299884 Seismic measurements while drilling Nov. 27, 2007
7278496 Drilling system and method Oct. 9, 2007
7280432 Oscillating shear valve for mud pulse telemetry Oct. 9, 2007
7261168 Methods and apparatus for using formation property data Aug. 28, 2007
7243736 Method of controlling a well experiencing gas kicks Jul. 17, 2007
7222681 Programming method for controlling a downhole steering tool May. 29, 2007
7178608 While drilling system and method Feb. 20, 2007
7168506 On-bit, analog multiplexer for transmission of multi-channel drilling information Jan. 30, 2007
7168487 Methods, apparatus, and systems for obtaining formation information utilizing sensors attached to a casing in a wellbore Jan. 30, 2007
7134511 Soil working method and device Nov. 14, 2006
7133325 Apparatus and method for generating electrical power in a borehole Nov. 7, 2006
7128142 Apparatus and methods for improved fluid displacement in subterranean formations Oct. 31, 2006
7100708 Autodriller bit protection system and method Sep. 5, 2006
7096975 Modular design for downhole ECD-management devices and related methods Aug. 29, 2006
7096976 Drilling formation tester, apparatus and methods of testing and monitoring status of tester Aug. 29, 2006
7093674 Drilling formation tester, apparatus and methods of testing and monitoring status of tester Aug. 22, 2006
7082821 Method and apparatus for detecting torsional vibration with a downhole pressure sensor Aug. 1, 2006
7063174 Method for reservoir navigation using formation pressure testing measurement while drilling Jun. 20, 2006
7059427 Automatic drilling system Jun. 13, 2006
7044229 Downhole valve device May. 16, 2006
7044237 Drilling system and method May. 16, 2006
7044239 System and method for automatic drilling to maintain equivalent circulating density at a preferred value May. 16, 2006
7031841 Method for determining pressure of earth formations Apr. 18, 2006
7013991 Obstacle detection system for underground operations Mar. 21, 2006
6986396 Method for determining sweep efficiency for removing cuttings from a borehole Jan. 17, 2006
6957700 Self-calibrated ultrasonic method of in-situ measurement of borehole fluid acoustic properties Oct. 25, 2005
6941804 Determining the PVT properties of a hydrocarbon reservoir fluid Sep. 13, 2005
6926081 Methods of discovering and correcting subterranean formation integrity problems during drilling Aug. 9, 2005
6920942 Method and apparatus for directly controlling pressure and position associated with an adjustable choke apparatus Jul. 26, 2005
6896074 System and method for installation and use of devices in microboreholes May. 24, 2005
6879947 Method for optimizing the bit design for a well bore Apr. 12, 2005
6868920 Methods and systems for averting or mitigating undesirable drilling events Mar. 22, 2005
6820702 Automated method and system for recognizing well control events Nov. 23, 2004

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