Gary T Oatman

US Patent:

52597237, Nov 9, 1993

Filed:

Jul 16, 1991

Appl. No.:

7/731077

Inventors:

Clyde A. Willis - Wichita Falls TX
Gary T. Oatman - Wichita Falls TX

Assignee:

W-N Apache Corporation - Wichita Falls TX

International Classification:

E21B 1915

US Classification:

4147464

Abstract:

A feeding device for down hole tubulars includes a frame which defines a support surface. First and second stops are arranged to reciprocate in stop guides between an upper position, in which the stops interrupt movement of a tubular, and a lower position in which the stops allow movement of the tubular. The stop guides are moveable relative to one another to adjust the separation between the stops as appropriate for tubulars of different diameters. A tilting actuator arm cycles the stops between upper and lower positions to control the feeding of tubulars along the support surface.

US Patent:

52733882, Dec 28, 1993

Filed:

Jul 16, 1991

Appl. No.:

7/730551

Inventors:

Clyde A. Willis - Wichita Falls TX
Gary T. Oatman - Wichita Falls TX

Assignee:

W-N Apache Corporation - Wichita Falls TX

International Classification:

E21B 1915

US Classification:

414 2254

Abstract:

A lifting device for down hole tubulars is used with an earth drilling machine of the type having a boom for moving a down hole tubular from a horizontal position at an intermediate level to a raised position aligned with a drilling axis, and a tubular holding device for holding a down hole tubular horizontally at a lower level, beneath the intermediate level. The lifting device includes first and second spaced, parallel tracks oriented to extend substantially from the lower level substantially to the upper level and first and second dolleys, each guided for movement along a respective one of the tracks and configured to retain the down hole tubular. The dolleys are moved between the lower and intermediate levels by an actuator which is connected to both of the dolleys by a mechanical linkage which includes tension members. This mechanical linkage positively synchronizes movement of the dolleys along the tracks to maintain the tubular horizontal as it is moved between the lower and intermediate levels.