Robert A Stratton

US Patent:

20120012306, Jan 19, 2012

Filed:

Jul 19, 2010

Appl. No.:

12/838724

Inventors:

Shawn J. Treadaway - Houston TX, US
Robert C. Stratton - Houston TX, US
James A. Rochen - Waller TX, US

Assignee:

WEATHERFORD/LAMB INC. - Houston TX

International Classification:

E21B 23/01

US Classification:

166216

Abstract:

A downhole tool slip mechanism including a cone, cage, and slip disposed on a mandrel. The cone and cage can be move in relation to one another, and the come may be locked into place during run-in and retrieval downhole. The cage contains slip slots contains a spring retaining finger for a spring that resides between the retention finger and the slip. This spring serves to bias the slip inward during run-in and retrieval. The slip slots have load-bearing shoulders used to engage the slip during retrieval. The slips outer surface is completely covered in wickers so that the slip can sustain greater loads when set in place. Additionally, the slip has load-bearing shoulders with an increased thickness cross-section to sustain greater loads during retrieval while minimizing slip and cage failures.

US Patent:

20140000906, Jan 2, 2014

Filed:

Jun 28, 2012

Appl. No.:

13/536078

Inventors:

Scott Earl Williamson - Caslte Rock CO, US
Robert Christopher Stratton - Houston TX, US

International Classification:

E21B 43/10
E21B 34/06
E21B 23/04

US Classification:

166373, 166212, 166208

Abstract:

A liner flotation system comprises a liner, a first valve, and a second valve configured to form a gas filled chamber within the liner. The first valve is operable to allow fluid flow into the chamber, and the second valve operable to allow fluid flow out of the chamber. A sleeve is disposed in the chamber, and the first valve is movable into engagement with the sleeve to provide an indication of a position of the first valve. A method of securing a liner in a well comprises lowering a liner having a gas filled chamber in the well, actuating a valve to open fluid flow into the chamber, removing the gas from the chamber, and moving the valve into engagement with a sleeve coupled to the liner to provide an indication of a position of the valve.