Cary A Maurstad

US Patent:

8327956, Dec 11, 2012

Filed:

Dec 11, 2009

Appl. No.:

12/636506

Inventors:

Steven W. Drews - Cypress TX, US
Cary Maurstad - Friendswood TX, US

Assignee:

Varel International, Ind., L.P. - Carrollton TX

International Classification:

E21B 10/36

US Classification:

175431

Abstract:

A PDC bit includes a plurality of blades including primary blades and secondary blades. The included primary blades are set with PDC cutters in accordance with a “single set” methodology. The included secondary blades, however, are set with PDC cutters using a type of “plural set” methodology such that the radial positions of cutters on a secondary blade match the radial positions of cutters on a single set primary which is immediately preceding that secondary blade. Plural secondary blades can be positioned to follow a single primary blade, and the cutters on those plural secondary blades will have radial positions matching the cutters of the immediately preceding single set primary blade.

US Patent:

8544568, Oct 1, 2013

Filed:

Dec 6, 2010

Appl. No.:

12/960926

Inventors:

Cary Andrew Maurstad - Friendswood TX, US
Zane Michael Pettiet - Tomball TX, US

Assignee:

Varel International, Inc., L.P. - Carrollton TX

International Classification:

E21B 10/46

US Classification:

175378, 175377, 175431

Abstract:

A PDC bit includes a plurality of blades. A blade includes a primary cutter row and a secondary cutter row. Primary PDC cutters on the primary cutter row are set in accordance with a single set methodology. Backup PDC cutters on the secondary cutter row are set in accordance with a methodology wherein a radial position of each backup PDC cutter in the secondary cutter row is offset from a radial position of each primary PDC cutter in the primary cutter row. The blade further includes a tertiary cutter row. Additional backup PDC cutters on the tertiary cutter row are set in accordance with a methodology wherein a radial position of each additional backup PDC cutter in the tertiary cutter row is offset from a radial position of each primary PDC cutter in the primary cutter row. The backup cutter setting methodology is effectively radially positions the included backup PDC cutters (in the secondary cutter row and/or tertiary cutter row) between primary PDC cutters in the primary cutter row.

US Patent:

20070235230, Oct 11, 2007

Filed:

Dec 20, 2006

Appl. No.:

11/643718

Inventors:

Bruno Cuillier - Pau, FR
Alfazazi Dourfaye - Paris, FR
Cary Maurstad - Friendswood TX, US
Mike Reese - Houston TX, US
Mike Thigpen - Houston TX, US
Yuri Palaschenko - Houston TX, US

International Classification:

E21B 10/00

US Classification:

175428000

Abstract:

A PDC cutter utilizes the combination of an elliptical shape with higher thermal resistance obtained through leaching to provide a cutter which is more effective than a cutter using either concept alone. The PDC cutter includes a tungsten carbide portion with protrusions extending from a surface thereof in a pattern. The diamond volume is mounted to the surface wherein the protrusions allow for the diamond volume to be larger about a perimeter edge of the cutter and smaller/shallower in a center region of the cutter. The protrusions providing surfaces for the diamond layer (table) to bond to the underlying tungsten carbide portion. With this configuration, diamond volume is maximized around the edge of the cutter.

US Patent:

20090025984, Jan 29, 2009

Filed:

Jul 25, 2008

Appl. No.:

12/180276

Inventors:

Scott Buteaud - Houston TX, US
Cary Maurstad - Friendswood TX, US

Assignee:

Varel International, Ind., L.P. - Carrollton TX

International Classification:

E21B 10/42

US Classification:

175421, 761084, 164161

Abstract:

A bit mold is milled using a turning stage which forms a base mold component and a base gagering component. Next, a blade milling stage is performed in which the base mold component and base gagering component are milled to define integral junkslot formers separated by blade regions. Lastly, a pocket milling stage is performed in which the blade regions and integral junkslot formers of the base mold component are milled to define a plurality of cutter pockets in primary and perhaps secondary rows. Each cutter pocket includes a seat portion and a face portion. The milling of the pocket milling stage provides, at one or more of the cutter pockets, a facet. This facet is provided in an area about the junkslot former associated with the face portion of the cutter pocket, the face portion having, due to the presence of the facet, a surface for matching a cutter core displacement end surface without voids of a size which would require the use of fill material. The facet is also provided on either side of the pocket associated with the seat portion to avoid the need to clay the sides of the displacement for providing top-loading clearances. The milling process at the pocket milling stage further supports definition of relief and erosion resistance features in the mold.

US Patent:

51294710, Jul 14, 1992

Filed:

May 31, 1991

Appl. No.:

7/708854

Inventors:

Cary A. Maurstad - Kingwood TX
James R. Hall - Huffman TX

Assignee:

Hughes Tool Company - Houston TX

International Classification:

E21B 1022
F16C 3376
F16J 1550

US Classification:

175228

Abstract:

An earth boring bit having a body, pressure compensating lubricating system and cantilevered bearing shaft with an annular seal surface and a radial seal surface. A cutter is rotatably secured to the bearing shaft, with an annular seal recess having radial and cylindrical seal surfaces to oppose the seal surfaces on the body and bearing shaft to define a seal gland. A resilient and annular packing ring is compressed between the cylindrical seal surfaces, but has a length less than the minimum length of the gland. A shroud extends inwardly near the outer backface a selected distance behind the packing ring to bias it inwardly. The shroud extends inwardly toward the bearing not more than about 30% of the cross-sectional thickness of the O-ring in the relaxed condition. The O-ring is compressed in a range of about 10 to 15 percent.

US Patent:

20200011137, Jan 9, 2020

Filed:

Oct 16, 2018

Appl. No.:

16/161661

Inventors:

- CARROLLTON TX, US
CARY ANDREW MAURSTAD - LIVINGSTON TX, US

International Classification:

E21B 10/43
E21B 10/55

Abstract:

A bit for drilling a wellbore includes: a body; and a cutting face including: a blade protruding from the body; and a row of cutters, each cutter including: a substrate mounted in a pocket formed adjacent to a leading edge of the blade; and a cutting table made from a superhard material, mounted to the substrate, and having a working face. A first subset of the row of cutters is oriented at a negative side rake angle. A second subset of the row of cutters is oriented at a zero or slightly positive side rake angle. The first and the second subsets are alternating. An innermost cutter of the first subset has a maximum absolute value of the negative side rake angle. The absolute value negative side rake angles of the rest of the cutters decrease as their distance from a center of the cutting face increases.

US Patent:

20180355670, Dec 13, 2018

Filed:

Jun 8, 2017

Appl. No.:

15/617005

Inventors:

- CARROLLTON TX, US
JOHNATHAN WALTER HOWARD - CONROE TX, US
THOMAS GALLIFET - TOMBALL TX, US
PATRICIA ANN NEAL - HOUSTON TX, US
CARY ANDREW MAURSTAD - LIVINGSTON TX, US

International Classification:

E21B 10/14
E21B 10/18
E21B 29/00
E21B 10/24

Abstract:

A roller-mill bit for use in a wellbore includes: a body having a coupling formed at an upper end thereof and a plurality of lower legs; a plurality of roller disks, each roller disk secured to a bearing shaft of a respective leg for rotation relative thereto; a row of crushers mounted around each roller disk; and a fixed mill mounted to the bearing shafts and comprising a pad for each roller disk. Each pad is dressed with a cermet material.

US Patent:

20150226007, Aug 13, 2015

Filed:

Feb 6, 2015

Appl. No.:

14/616361

Inventors:

- Carrollton TX, US
William W. King - Houston TX, US
Cary Andrew Maurstad - Friendswood TX, US

International Classification:

E21B 10/18
E21B 10/52
E21B 10/50

Abstract:

A bit body for a drill bit for horizontal directional drilling includes a pair of legs and a small wedge member disposed between the pair of legs. A roller cone is rotatably mounted to each bearing shaft extending from a respective leg. The roller cones support full coverage cutting structures. A center jet nozzle is configured to direct drilling fluid between the pair of roller cones. A stabilizer member maintains an upright drilling position of the drill bit within the borehole.