David O Trent

US Patent:

7013824, Mar 21, 2006

Filed:

Aug 21, 2003

Appl. No.:

10/645112

Inventors:

Jeffrey D. Otten - Cypress TX, US
David Trent - Cypress TX, US
Travis R. Jordan - Houston TX, US

Assignee:

Seahorse Equipment Corporation - Houston TX

International Classification:

B63B 35/44

US Classification:

114264, 441 3

Abstract:

A riser centralizer for transferring lateral loads from the riser to a platform hull includes a keel centralizer mounted on a keel joint. The keel centralizer is received within a keel guide sleeve secured in a support mounted at the lower end of the platform hull. The keel centralizer includes a nonmetallic composite bearing ring having a radiused peripheral profile for minimizing contact stresses between the keel centralizer and the keel guide sleeve in extremes of riser and platform motion. The internal surface of the keel guide sleeve is clad with a corrosion resistant alloy and coated with a wear resistant ceramic rich coating.

US Patent:

7270071, Sep 18, 2007

Filed:

Mar 30, 2007

Appl. No.:

11/694708

Inventors:

David Trent - Cypress TX, US

Assignee:

ATP Oil & Gas Corporation - Houston TX

International Classification:

B63B 35/44

US Classification:

114265, 4051951

Abstract:

The present invention is a deep draft partially submersible and buoyant floating vessel comprised of at least three independent vertical columns. The columns have an upper column with an upper column diameter and a lower column integrally connected to the upper column with a lower column diameter smaller than the upper column diameters. The lower column contains a variable ballast, a free flooding ballast, and a lower column fixed ballast. The lower pontoon is connected to each lower column opposite the upper column. The lower pontoon has lower pontoon fixed ballast means. A deck is located on the columns for supporting a tensioner assembly.

US Patent:

7329070, Feb 12, 2008

Filed:

Mar 30, 2007

Appl. No.:

11/694680

Inventors:

David Trent - Cypress TX, US

Assignee:

ATP Oil & Gas Corporation - Houston TX

International Classification:

E21B 15/02

US Classification:

4052244

Abstract:

A tensioner assembly having a fully extended position, a fully retracted position and a plurality of extended positions there between, for supporting a riser extending downwardly from a platform to a subsea wellhead. The tensioner assembly can have a riser conductor portion, a tension disk, a lower support structure, a plurality of ram tensioner piston rods, a cylinder deck, a plurality of hydraulic stroke cylinders, a plurality of first primary accumulators, a plurality of second primary accumulators, a plurality of first valves, a plurality of secondary accumulators, and a plurality of second valves.

US Patent:

7588393, Sep 15, 2009

Filed:

Sep 2, 2008

Appl. No.:

12/203026

Inventors:

David Trent - Cypress TX, US
Daniel H. Longwell - Houston TX, US

Assignee:

ATP Oil & Gas Corporation - Houston TX

International Classification:

B63B 35/44
E21B 17/01

US Classification:

4052244, 4052231, 166352, 166367

Abstract:

A method for supporting top tension drilling and production risers on a floating vessel using a tensioner assembly above the water line of the vessel. The method can include attaching at least one hydraulic cylinder on a first end to a first position on a floating vessel and on a second end to a tension frame below the first position. The next step of the method can be forming a fluid connection between the at least one hydraulic cylinder and at least one primary accumulator.

US Patent:

7654327, Feb 2, 2010

Filed:

Sep 2, 2008

Appl. No.:

12/203002

Inventors:

David Trent - Cypress TX, US

Assignee:

ATP Oil & Gas Corporation - Houston TX

International Classification:

E21B 7/12

US Classification:

166345, 166359, 4052244, 4052231

Abstract:

A tensioner assembly for moveably carrying a conductor that communicates from a wellhead to a piece of well access equipment on a rig. The tensioner assembly includes a support frame, at least one hydraulic cylinder connected to the support frame, and at least one primary accumulator in fluid communication with the hydraulic cylinder.

US Patent:

7886828, Feb 15, 2011

Filed:

Sep 2, 2008

Appl. No.:

12/203010

Inventors:

David Trent - Cypress TX, US
Daniel H. Longwell - Houston TX, US

International Classification:

E21B 29/12
E21B 7/12

US Classification:

166355, 166345, 166359, 166352, 4052244

Abstract:

A floating vessel for supporting top tension drilling and production risers having a hull and an operation deck disposed on top of the hull. A tensioner assembly for moveably carrying a conductor that communicates from a wellhead to a piece of well access equipment. The well access equipment is connected to the floating vessel. The tensioner assembly is supported by the floating vessel.

US Patent:

7976247, Jul 12, 2011

Filed:

Nov 4, 2009

Appl. No.:

12/612474

Inventors:

David Trent - Cypress TX, US
Charles C. Trent - San Antonio TX, US

Assignee:

ATP Oil & Gas Corporation - Houston TX

International Classification:

E21B 43/01

US Classification:

4052244, 4052231, 166355, 92 85 B

Abstract:

A self contained dual pressure cylinder for use in tensioner assemblies for oil and natural gas floating vessels. The self contained dual pressure cylinder can have a high pressure outer barrel surrounding a high pressure inner barrel, forming a high pressure gas channel, a low pressure outer barrel surrounding a low pressure inner barrel, forming a low pressure fluid channel. A high pressure gas port connected to a high pressure gas reservoir, a low pressure fluid port connected to a low pressure gas reservoir, a low pressure fluid compression area connected to the low pressure fluid port, a hollow rod slidingly engaged each inner barrel, a dual pressure capture plate with moveable rod seals and moveable rod wear, a piston a low pressure elastomeric seal, a low pressure/high pressure separator, and a high pressure elastomeric seal.

US Patent:

7980786, Jul 19, 2011

Filed:

Nov 4, 2009

Appl. No.:

12/612454

Inventors:

David Trent - Cypress TX, US
Charles C. Trent - San Antonio TX, US

Assignee:

ATP Oil & Gas Corporation - Houston TX

International Classification:

E21B 43/01

US Classification:

4052244, 4052231, 166355, 92 85 B

Abstract:

A tensioner system is described for oil and natural gas floating platforms and floating vessels having a plurality of self contained dual pressure cylinders for adjusting simultaneously low and high pressures in low pressure and high pressure channels, wherein the tensioner system is disposed on a floating structure to dampen the effects of sea waves and wind load between casing from a well and the floating structure due to movement of the sea and movement based on wind.