1
Roger Fincher, Larry Watkins, Friedhelm Makohl, Detlef Hahn: Method and apparatus for drilling boreholes in earth formations (drilling liner systems). Baker Hughes Incorporated, Madan Mossman & Sriram P C, March 6, 2001: US06196336 (187 worldwide citation)

A drilling liner having a core bit at its bottom end is carried along with a pilot bit on an inner bottom hole assembly driven by a downhole mud motor. In one embodiment, the motor is powered by mud carried by an inner string. Alternatively, the inner string may be omitted and the flow of mud throug ...


2
Peter Fontana, Larry Watkins, Peter Aronstam: Drilling system and method for controlling equivalent circulating density during drilling of wellbores. Baker Hughes Incorporated, Madan Mossman & Sriram P C, September 18, 2007: US07270185 (92 worldwide citation)

A drilling system for drilling subsea wellbores includes a tubing-conveyed drill bit that passes through a subsea wellhead. Surface supplied drilling fluid flows through the tubing, discharges at the drill bit, returns to the wellhead through a wellbore annulus, and flows to the surface via a riser ...


3
Roger W Fincher, Roland May, Peter Fontana, Larry Watkins, James W Macfarlane: Subsea wellbore drilling system for reducing bottom hole pressure. Deep Vision, Madan Mossman & Sriram P C, July 9, 2002: US06415877 (87 worldwide citation)

The present invention provides drilling systems for drilling subsea wellbores. The drilling system includes a tubing that passes through a sea bottom wellhead and carries a drill bit. A drilling fluid system continuously supplies drilling fluid into the tubing, which discharges at the drill bit bott ...


4
Roger W Fincher, Roland May, Peter Fontana, Larry Watkins, James W Macfarlane: Subsea wellbore drilling system for reducing bottom hole pressure. Deep Vision, Madan Mossman & Sriram P C, November 18, 2003: US06648081 (58 worldwide citation)

The present invention provides drilling systems for drilling subsea wellbores. The drilling system includes a tubing that passes through a sea bottom wellhead and carries a drill bit. A drilling fluid system continuously supplies drilling fluid into the tubing, which discharges at the drill bit bott ...


5
Sven Krueger, Volker Krueger, Harald Grimmer, Roger Fincher, Larry Watkins, Peter Aronstam, Peter Fontana: Control systems and methods for active controlled bottomhole pressure systems. Baker hughes Incorporated, Madan Mossman & Sriram P C, February 13, 2007: US07174975 (52 worldwide citation)

Methods and control systems are provided for a wellbore drilling system having an active differential pressure device (APD device) in fluid communication with a returning fluid. The APD Device creates a differential pressure across the device, which reduces the pressure below or downhole of the devi ...


6
Roger W Fincher, Roland May, Peter Fontana, Larry Watkins, James W Macfarlane: Subsea wellbore drilling system for reducing bottom hole pressure. Deep Vision, Madan Mossman & Sriram P C, February 15, 2005: US06854532 (49 worldwide citation)

The present invention provides drilling systems for drilling subsea wellbores. The drilling system includes a tubing that passes through a sea bottom wellhead and carries a drill bit. A drilling fluid system continuously supplies drilling fluid into the tubing, which discharges at the drill bit bott ...


7
Roland E Chemali, Volker Krueger, Peter Aronstam, Roger Fincher, Larry Watkins: Apparatus and methods for self-powered communication and sensor network. Baker Hughes Incorporated, Madan Mossman & Sriram P C, July 15, 2008: US07400262 (44 worldwide citation)

A system for communicating between a first location and a second location comprises a jointed tubular string having a first section and a second section connected at a connection joint, with the tubular string having a fluid in an internal passage thereof. A first acoustic transducer is mounted in t ...


8
Peter Aronstam, Roger Fincher, Larry Watkins: Steerable bit assembly and methods. Baker Hughes Incorporated, Madan Mossman & Sriram P C, October 30, 2007: US07287604 (43 worldwide citation)

A drilling system includes a steerable bottomhole assembly (BHA) having a steering unit and a control unit that provide dynamic control of drill bit orientation or tilt. Exemplary steering units can adjust bit orientation at a rate that approaches or exceeds the rotational speed of the drill string ...


9
Peter Fontana, Roger Fincher, Larry Watkins, Peter Aronstam: Wellbore fluid circulation system and method. Baker Hughes Incorporated, Madan Mossman & Sriram P C, June 6, 2006: US07055627 (42 worldwide citation)

The present invention provides drilling systems for drilling wellbores. The drilling system includes an umbilical that passes through a wellhead and carries a drill bit. A drilling fluid system supplies drilling fluid into an annulus (supply line) between the umbilical and the wellbore, which discha ...


10
Peter Aronstam, Volker Krueger, Sven Krueger, Harald Grimmer, Roger Fincher, Larry Watkins, Peter Fontana: Modular design for downhole ECD-management devices and related methods. Baker Hughes Incorporated, Madan Mossman & Sriram P C, August 29, 2006: US07096975 (36 worldwide citation)

One or more components of a wellbore drilling assembly utilize a modular construction to facilitate assembly, disassembly, repair and/or maintenance of a wellbore drilling assembly and/or to extend the overall operating capabilities of the drilling assembly. In one embodiment, a modular construction ...