| Patent Number |
Title Of Patent |
Date Issued |
| RE36012 |
Accelerator-based methods and apparatus for measurement-while-drilling |
December 29, 1998 |
| Measurement-while-drilling apparatus includes a 14 MeV neutron accelerator, a near-spaced neutron detector which primarily senses source neutrons and whose output is proportional to source strength, one or more intermediately-spaced epithermal neutron detectors eccentered against the |
| 7552761 |
Method and system for wellbore communication |
June 30, 2009 |
| A communication system for a casing while drilling system is provided. The casing while drilling system is adapted to advance a bottom hole assembly into a subsurface formation via a casing. The communication system comprises a high frequency modulator and a transducer. The modulator is |
| 7004263 |
Directional casing drilling |
February 28, 2006 |
| A directional casing drilling system including a casing string for rotation of a drill bit, a shaft coupled to the casing string, and a sleeve having pads that are hydraulically extensible. The sleeve may be positioned about a portion of the shaft. The invention may also include a tu |
| 6761230 |
Downhole drilling apparatus and method for using same |
July 13, 2004 |
| A method and apparatus is provided to support a gyroscope within a downhole drilling tool. A packaging system is positioned within a drill collar of the drilling tool and includes a housing for the gyro and at least one centralizer supporting the housing within the drill collar. The syst |
| 6219301 |
Pressure pulse generator for measurement-while-drilling systems which produces high signal stren |
April 17, 2001 |
| A system is disclosed for generating and transmitting data signals to the surface of the earth while drilling a borehole, the system operating by generating pressure pulses in the drilling fluid filling the drill string. The system is designed to maximize signal strength while minimizing |
| 5631563 |
Resistivity antenna shield, wear band and stabilizer assembly for measuring-while-drilling tool |
May 20, 1997 |
| A sensor protection system for use with an MWD tool includes a tubular body having lesser and greater diameter portions, antennas mounted in grooves in the lesser diameter portion, shield sleeves covering the antennas and being locked in place against longitudinal and rotational movement |
| 5613561 |
Apparatus for sealing instruments in a downhole tool |
March 25, 1997 |
| An apparatus for sealing a first pressure environment from a second, lower pressure environment, includes a plug having a desired cross section for insertion into a barrier wall aperture shaped to receive the plug. The barrier wall has a first pressure environment on its outside surface |
| 5539225 |
Accelerator-based methods and apparatus for measurement-while-drilling |
July 23, 1996 |
| Measurement-while-drilling apparatus includes a 14 MeV neutron accelerator, a near-spaced neutron detector which primarily senses source neutrons and whose output is proportional to source strength, one or more intermediately-spaced epithermal neutron detectors eccentered against the |
| 5363931 |
Drilling stabilizer |
November 15, 1994 |
| A stabilizer to be mounted on a collar of a well drilling string including a circumferentially continuous tubular body having several outwardly extending blades thereon, the tubular body having an inner dimension such that it can be slid onto a drill collar, and radially energized compon |
| 5184692 |
Retrievable radiation source carrier |
February 9, 1993 |
| A retrievable radiation source carrier assembly for a logging while drilling tool is disclosed. The carrier includes a solid rod or member of high strength and low elastic modulus that connects the housings of at least two radiation sources. In a preferred embodiment, the carrier inc |
| 4432143 |
Well logging apparatus |
February 21, 1984 |
| An elongated body member having a plurality of crank arms pivotally attached thereto, such crank arms disposed generally symmetrically around the perimeter of the body member. At a first end of each crank arm is a contact pad for maintaining substantial contact with the sidewalls of a |
