Joseph D Hebert

US Patent:

49093207, Mar 20, 1990

Filed:

Oct 14, 1988

Appl. No.:

7/258228

Inventors:

Joseph V. Hebert - Houston TX
Robert J. Schwartz - Houston TX

Assignee:

Drilex Systems, Inc. - Houston TX

International Classification:

E21B 2902
E21B 2912

US Classification:

166 551

Abstract:

A detonation assembly for an explosive wellhead severing system which employs a battery pack lowerable through a drill string to engage and power the detonation assembly positioned within the well bore. The lowerable unit includes a biased shutter which seals the contacts from discharge of the battery pack by the surrounding fluids. The shuttered unit is lowered into contact with the receiving unit to arm the detonation assembly. Until the power unit is lowered into engagement, the severing system is not armed. In case of malfunction or misfire, the power unit can be retrieved to disarm the detonator assembly. The entire assembly is housed within the drill string to isolate the critical elements from the surrounding environment.

US Patent:

56578202, Aug 19, 1997

Filed:

Dec 14, 1995

Appl. No.:

8/572592

Inventors:

Thomas F. Bailey - Pebblebrook TX
John E. Campbell - Houston TX
Joseph V. Hebert - Tomball TX

Assignee:

Smith International, Inc. - Houston TX

International Classification:

E21B 708

US Classification:

166 557

Abstract:

A two trip sidetrack casing milling apparatus for elongating and enlarging a previously formed window in a cased borehole in preparation for a subsequent sidetracking drilling operation is disclosed. The apparatus consists of three mills on a shaft, a first window mill is secured to an end of a shaft. The first window mill forms a diameter larger than a diameter of a subsequent sidetracking drill bit that is passed through the window. A second pilot mill is secured to the shaft and strategically positioned above the first window mill. The second pilot mill forms a diameter that is less than the diameter of the first window mill. A third watermelon mill is secured to the shaft and strategically positioned above the second pilot mill. The third watermelon mill forms a diameter that is at least the same diameter as the first window mill. The second, smaller in diameter pilot mill serves to move toward the window thereby straightening the shaft while further cutting a portion of the casing surrounding the window thus assuring a more stable and accurate sidetrack direction.