Well logging direct memory access system and method

Details Well logging direct memory access system and method Well logging direct memory access system and method

1985-04-22

1988-08-23

Smith, Jerry

Boots, shoes, and leggings

250270, 250261, G01V 510

Patent

active

047665432

ABSTRACT:
A generalized computer-based system and method for acquisition of nuclear well logging data, including downhole generation of energy and time spectral information. A downhole instrument traverses a borehole introducing high energy neutrons into the formation at prescribed depths. Resultant gamma rays are detected and converted into pulses which are amplified and conditioned.
A downhole multi-parameter analyzer stores pulse height and arrival time for each detected gamma ray whereby time and energy spectra are formed. Spectra include, alone or in combination, time spectra of the neutron source, inelastic and capture energy spectra. From the source time spectra, peaks are detected and capture and inelastic gates referenced thereto. Also thermal neutron decay between source bursts is derived. From the energy spectra peaks including hydrogen or iron are detected and used for calibration and automatic gain control of the gamma ray detector.
High speed buffer means and direct memory access enables access to memory by both the multi-parameter analyzer and CPU so as to avoid inhibiting data acquisition during processing of the acquired spectra by the CPU. Parameters including pulse discrimination level, detector gain, and gate positioning affecting the spectra generated downhole, which may simultaneously include inelastic, capture, and time distribution spectra, are variable in the analyzer by means of CPU control functions.

REFERENCES:
patent: 3379882 (1968-04-01), Youmans
patent: 4161782 (1979-07-01), McCracken
patent: 4317993 (1982-03-01), Herzog et al.
patent: 4327290 (1982-04-01), Plasek
patent: 4381449 (1983-04-01), Smith, Jr.
patent: 4471435 (1984-09-01), Meisner
patent: 4507554 (1985-03-01), Hertzog et al.

Affiliated with

Also associated with

Rating

Well logging direct memory access system and method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Well logging direct memory access system and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Well logging direct memory access system and method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-839801