Stephen Scott Gill

US Patent:

58522620, Dec 22, 1998

Filed:

Sep 28, 1995

Appl. No.:

8/535968

Inventors:

Stephen P. Gill - Atherton CA
Timothy Prowten - San Jose CA
Marek Z. Kozak - Fremont CA

Assignee:

Magnetic Pulse, Inc. - Fremont CA

International Classification:

G01V 140

US Classification:

181106

Abstract:

An acoustic formation logging tool includes a transmitter, a receiver, a tube wave absorber, and a digital signal processing section. The transmitter includes an electromagnetic actuator based on capacitive discharge through a coil, producing an intense magnetic pressure which causes an actuator to move into an oil-filled acoustic waveguide. The actuator includes a pusher plate with holes that reduces cavitation and is capable of operation at great depths commonly encountered in oil well logging. Pulse power and spectrum of the acoustic transmitter are sufficient to measure either reflections from distant geological structures or waves propagating through the formation near the borehole. A positive acoustic pulse and a symmetric negative acoustic pulse are generated by action of the actuator on the acoustic waveguide. By directing and diverting the positive and negative pulses, a plurality of acoustic transmitters in a tool provide for operation in a multiplicity of modes: monopole, dipole, quadrupole, and a new unipole mode.

US Patent:

59369132, Aug 10, 1999

Filed:

Jul 24, 1997

Appl. No.:

8/900242

Inventors:

Stephen P. Gill - Atherton CA
Timothy Prowten - San Jose CA
Marek Z. Kozak - Fremont CA

Assignee:

Magnetic Pulse, Inc - Fremont CA

International Classification:

G01V 140

US Classification:

367 25

Abstract:

A receiver section for an acoustic oil well logging tool comprised of a plurality of receiver sub-units connected longitudinally within a rigid tubular member. Each receiver sub-unit has a series of acoustic wave sensors located for receiving and detecting monopole, dipole, quadrupole and unipole waveforms. Separate channels are provided for conveying waveforms data from each receiver sub-unit to an above ground data processing unit. Each receiver sub-unit also includes a compensating sensor for detecting tool vibrations and for producing signals which are combined with waveform data in the processing unit to eliminate the effects of tool vibration.

US Patent:

48496995, Jul 18, 1989

Filed:

Jun 8, 1987

Appl. No.:

7/059107

Inventors:

Stephen P. Gill - Atherton CA
John D. Watson - Oakland CA
Keith O. Brink - San Jose CA

Assignee:

MPI, Inc. - Fremont CA

International Classification:

G01V 328

US Classification:

324339

Abstract:

In accordance with the present invention, a pulsed induction logging system is provided which includes a logging sonde for traversing a borehole and having downhole microprocessor/controller circuitry in operative contact with a separate host computer/controller at the earth's surface. The host computer/controller and two downhole microprocessor/controllers constitute a network of digital computers and generate a digital pulsed logging code for periodically permitting a radiation coil to be driven by an oscillating current having high peak power. A powerful primary pulse of electromagnetic (EM) energy is periodically generated for irradiating the adjacent formation for induction logging purposes. The sonde also includes an antenna array for detecting secondary induced fields in the formation around the borehole. The array preferably includes a series of grouped, paired coils axially spaced along the borehole.

US Patent:

44157673, Nov 15, 1983

Filed:

Oct 19, 1981

Appl. No.:

6/312801

Inventors:

Stephen P. Gill - Atherton CA
Lawrence F. Wagner - Berkeley CA
Gregory G. Frye - San Leandro CA
Klaus-Peter A. Bantowsky - Hayward CA

Assignee:

Votan - Fremont CA

International Classification:

G10L 100

US Classification:

381 45

Abstract:

Speech signal analysis for data reduction, as stored for synthesis or recognition, is improved by features including: digital spectral analysis; reduction of channel data and bit allocation by selective summation of groups of contiguous data; using the mean average of the log amplitude to find the deviation for each channel; also using the instaneous shape of the mean value for each channel for pairs of adjacent frames, all combined to find a feature ensemble for each pair of adjacent frames.