1
Klaus B Huber, Joe C Hromas, Nolan C Lerche: Inductive coupler activated completion system. Schlumberger Technology Corporation, Gordon Waggett, John Ryberg, Jeffrey E Griffin, October 26, 1999: US05971072 (95 worldwide citation)

A well completion apparatus disposed in a wellbore having first and second tubings and a tool disposed in the second tubing. An inductive coupler has a male coil located in the first tubing and is configured to receive an input signal. A female coil in the inductive coupler is attached to the first ...


2
Joe C Hromas, Dinesh R Patel: Pressure-controlled well tester adapted to be selectively retained in a predetermined operating position. Schlumberger Technology Corporation, Henry N Garrana, John H Bouchard, August 16, 1994: US05337827 (91 worldwide citation)

In the present invention a testing tool having an axial flow passage is arranged to be connected in a pipe string and placed in a well bore. Communication through the flow passage is controlled by a valve member which is cooperatively arranged in the body to be moved back and forth for selectively o ...


3
Joe C Hromas, Klaus B Huber: Releasable connector assembly for a perforating gun and method. Schlumberger Technology Corporation, Dan C Hu, August 8, 2000: US06098716 (72 worldwide citation)

An apparatus for releasably coupling a perforating gun to a string includes a tubular member to couple the perforating gun to the string and a latch. The latch connects the perforating gun to the tubular member before detonation of the perforating gun. In response to the detonation of the perforatin ...


4
Joe C Hromas, Antoni K L Miszewski, Klaus B Huber: Automatic tubing release. Schlumberger Technology Corporation, Henry N Garrana, John H Bouchard, March 15, 1994: US05293940 (65 worldwide citation)

An automatic tubing release mechanism is adapted to be disposed in a wellbore between a tubing, on one end, and a perforating gun, on the other end. The release mechanism includes a frangible breakup tube, firing head positioned above the breakup tube, and the perforating gun positioned below the br ...


5
Klaus B Huber, Joe C Hromas: Azimuth-oriented perforating system and method. Schlumberger Technology Corporation, Jeffrey E Griffin, Jaime A Castano, John J Ryberg, December 21, 1999: US06003599 (46 worldwide citation)

An apparatus for positioning a tool, such as a perforating gun, in a wellbore to orient the tool in a desired direction. An anchor having a first reference terminal is set in the wellbore, the first reference terminal pointing in a known direction. A second reference terminal is attached to the tool ...


6
Klaus B Huber, Joe C Hromas, Arnold G Edwards: Tubing and wireline conveyed perforating method and apparatus. Schlumberger Technology Corporation, Henry N Garrana, John H Bouchard, June 25, 1991: US05025861 (43 worldwide citation)

A new method of standalone perforating comprises the steps of lowering a perforator part-way into a borehole on a tubing string; when perforating is desired, connecting a wireline to the perforator; disconnecting the perforator from the tubing string; lowering the perforator into the borehole to the ...


7
A Glen Edwards, Joe C Hromas, Klaus B Huber, Edward G Smith Jr: Shock absorber for use in a wellbore including a frangible breakup element preventing shock absorption before shattering allowing shock absorption after shattering. Schlumberger Technology Corporation, Henry N Garrana, John H Bouchard, November 22, 1994: US05366013 (38 worldwide citation)

A shock absorber, adapted to be disposed above a perforating gun in a tool string and adapted to be disposed in a wellbore, includes a crushable element disposed between an inner and outer housing, a frangible breakup element, and a detonating cord disposed within the frangible breakup element and c ...


8
Joe C Hromas, A Glen Edwards, Klaus B Huber: Hydrostatic setting tool including a selectively operable apparatus initially blocking an orifice disposed between two chambers and opening in response to a signal. Schlumberger Technology Corporation, Henry N Garrana, John H Bouchard, September 15, 1992: US05146983 (37 worldwide citation)

A hydrostatic setting tool, adapted for setting an anchored device in a wellbore, includes a housing having a pair of ports exposed to well fluid at hydrostatic pressure. The ports lead to a shoulder of a setting mandrel. A barrier is disposed diametrically across the setting tool and an oil chamber ...


9
Joe C Hromas: Pressure-controlled well tester operated by one or more selected actuating pressures. Schlumberger Technology Corporation, Henry N Garrana, John H Bouchard, March 13, 1990: US04907655 (31 worldwide citation)

In the representative embodiment of the new and improved well bore apparatus disclosed herein, a test valve is arranged to be coupled in a pipe string for positioning in a well bore. When the test valve is arranged to be selectively operated by changes in the well annulus pressure, the apparatus of ...


10
Joe C Hromas, Klaus B Huber: System for activating a perforating device in a well. Schlumberger Technology Corporation, John J Ryberg, Gordon G Waggett, June 15, 1999: US05911277 (28 worldwide citation)

Apparatus and method for activating a device in a well, such as firing a perforating gun in a well. An electrically-activated firing system is coupled to an actuating assembly, which includes a release piston movable by fluid pressure, a firing pin, and a frangible element connected to hold the rele ...