James Alexander Gregory

US Patent:

46403604, Feb 3, 1987

Filed:

Oct 21, 1985

Appl. No.:

6/789447

Inventors:

Albert G. Bodine - Van Nuys CA
James N. Gregory - Van Nuys CA

International Classification:

E21B 3314

US Classification:

166286

Abstract:

In forming a cement annulus around a well casing to provide an impervious seal around such casing, sonic energy is applied from a sonic oscillator to the casing and transmitted down the casing to the work area. To improve the coupling of sonic energy through the casing to the work area, the oscillator is coupled to the casing wall below the cement inlet by means of a clamp and link coupler so as to minimize the dissipation of sonic energy in the cement inlet. Further, the cement is fed to this inlet by means of a flexible hose coupling to isolate the inlet coupling and associated hardware from the sonic energy.

US Patent:

45222711, Jun 11, 1985

Filed:

Oct 17, 1983

Appl. No.:

6/542456

Inventors:

Albert G. Bodine - Van Nuys CA
James N. Gregory - Van Nuys CA

International Classification:

E21B 1716

US Classification:

175 56

Abstract:

A sonic damper unit which is placed directly above a drill collar string to damp out unwanted complex wave vibrations of the string both longitudinal and lateral in vibration mode. The damper unit comprises a tubular section which is filled with small pieces of material trapped therein which may comprise pellets of metal, pebbles, ceramic, etc. A longitudinal channel may be formed within the tubular damper unit for transporting mud therethrough and to be mixed into the trapped pellets or the like. The damper unit is preferably located in a low impedance region of the standing wave pattern formed in the string some distance from the bit, e. g. the top of the drill collar string. The pellets are capable of motion in a random pattern and thus effectively respond to the frequency content of complex vibrational wave modes both lateral and longitudinal and effectively damp out any such unwanted vibrational energy which may appear in the drill collar string.