Harold E. Payne
Engineering at Byu Blf Dr, Spring, TX

6644422, Nov 11, 2003

Aug 13, 2001

09/929175

Monty H. Rial - Dallas TX
Lawrence W. Diamond - Rockwall TX
Harold E. Payne - Spring TX

CDX Gas, L.L.C. - Richardson TX

E21B 728

175 57, 175285

An underreamer for forming a cavity within a well bore is provided. The underreamer may include a housing rotatably disposed within the well bore. The underreamer may also include an actuation rod slidably positioned in the housing. The underreamer may further include a plurality of cutter sets where each cutter set is pivotally coupled to the housing and the actuation rod. The cutter sets are also pivotally coupled together. An axial force applied to the actuation rod operates to slide the actuation rod relative to the housing and extend the cutter sets from a retracted position radially outward relative to the housing to form the cavity when the housing is rotated.

6595301, Jul 22, 2003

Aug 17, 2001

09/932482

Lawrence W. Diamond - Rockwall TX
Joseph A. Zupanick - Pineville WV
Harold E. Payne - Spring TX

CDX Gas, LLC - Dallas TX

E21B 1034

175 57, 175269, 175292

A single-blade underreamer for forming a cavity within a well bore includes a housing rotatably disposed within the well bore, and a stabilizer coupled to the housing. The stabilizer is operable to stabilize the housing within the well bore during formation of the cavity. The underreamer also includes a single cutter pivotally coupled to the housing, and a piston slidably disposed within the housing and adapted to engage the cutter. A downwardly disposed force applied to the piston is operable slide the piston relative to the housing to correspondingly extend the cutter outwardly relative to the housing from a retracted position to form the cavity during rotation of the housing.

6591922, Jul 15, 2003

Aug 13, 2001

09/929568

Monty H. Rial - Dallas TX
Lawrence W. Diamond - Rockwall TX
Harold E. Payne - Spring TX

CDX Gas, LLC - Dallas TX

B21B 728

175288, 175284, 175292

An underreamer for forming a cavity within a well bore may include a housing rotatably disposed within the well bore. The underreamer may also include an actuation rod slidably positioned in the housing. The underreamer may further include a plurality of cutter sets nested together around the actuation rod while the cutter sets are in a retracted position where each cutter set is pivotally coupled to the housing and the actuation rod. The cutter sets are also pivotally coupled together. An axial force applied to the actuation rod operates to slide the actuation rod relative to the housing and extend the cutter sets radially outward relative to the housing to form the cavity when the housing is rotated.

6575255, Jun 10, 2003

Aug 13, 2001

09/929551

Monty H. Rial - Dallas TX
Lawrence W. Diamond - Rockwall TX
Harold E. Payne - Spring TX

CDX Gas, LLC - Dallas TX

E21B 1062

175 57, 175285

An underreamer for forming a cavity within a well bore is provided. The underreamer may include a housing rotatably disposed within the well bore. The underreamer may also include a sleeve slidably positioned around the housing. The underreamer may further include at least one cutter set where each cutter set is pivotally coupled to the housing and the sleeve. An axial force applied to the sleeve operates to slide the sleeve relative to the housing and extend each cutter set from a retracted position radially outward relative to the housing to form the cavity when the housing is rotated.

6722452, Apr 20, 2004

Feb 19, 2002

10/079444

Monty H. Rial - Dallas TX
Lawrence W. Diamond - Rockwall TX
Joseph A. Zupanick - Pineville WV
Harold E. Payne - Spring TX

CDX Gas, LLC - Dallas TX

E21B 728

175 57, 175265, 175284

An underreamer for forming a cavity within a well bore includes a housing adapted to be rotatably disposed within the well bore and a piston slidably coupled to the housing. The underreamer also includes a first cutter having a first end and a second end. The first end of the first cutter is pivotally coupled to the housing. The underreamer further includes a second cutter having a first end and a second end. The first end of the second cutter is coupled to the piston. The second end of the first cutter is coupled to the second cutter such that an axial force applied to the piston is operable to slide the piston relative to the housing and extend the second end of the second cutter radially outward relative to the housing from a retracted position to form the cavity when the housing is rotated relative to the well bore.

6595302, Jul 22, 2003

Aug 17, 2001

09/932487

Lawrence W. Diamond - Rockwall TX
Harold E. Payne - Spring TX

CDX Gas, LLC - Dallas TX

E21B 728

175 65, 175 57, 175265, 175267

An underreamer for forming a cavity within a well bore includes a housing rotatably disposed within the well bore. The underreamer also includes a plurality of cutting blades pivotally coupled to the housing. The underreamer further includes a piston slidably disposed within the housing and adapted to engage the cutting blades. The piston is operable to receive a downwardly disposed force operable slide the piston relative to the housing. The sliding movement of the piston extends the cutting blades outwardly from a retracted position relative to the housing. The underreamer also includes a passage disposed within the piston and operable to communicate a fluid received via an annulus of the housing to the cutting blades.