G - Physics – 01 – V
Patent
G - Physics
01
V
358/3, 358/4
G01V 5/00 (2006.01)
Patent
CA 1259428
NUCLEAR WELL LOGGING DATA ACQUISITION SYSTEM AND METHOD 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. For acquiring energy spectrum data, a downhole multi-parameter analyzer is provided including a pulse height analyzer and memory. The analyzer converts each gamma ray pulse height into a digital code by peak detection, level and pulse pile-up discrimination, sample-and-hold, and analog-digital conversion. The digital code includes the address of a unique memory location or channel corresponding to the energy of the particular gamma ray. After a preselected time interval which may include several source firings, the memory channels collectively contain counts for each incremental energy band in the desired energy spectrum. The memory may then be interrogated by the downhole CPU for spectral analysis, transmission of the spectrum to the surface, and presentation of a gamma ray emission versus energy level plot. For acquiring temporal spectrum data, the multi- parameter analyzer also includes a memory address generator. The generator repeatedly produces a numerical sequence of memory address codes corresponding to a sequence of adjacent time windows. Each code uniquely defines a different discrete time window relative to a -2- reference start time, whereby the windows collectively comprise the time interval of the desired spectrum. Each time a gamma ray pulse is detected, the memory address generated at that time addresses a corresponding memory location and increments the count value resident therein. At conclusion of the time spectrum interval of interest which may include the source firing interval, the memory locations may be interrogated by the CPU and the resultant spectral data analyzed, transmitted to the surface, or presented visually as a gamma ray emission count versus time plot.
507173
Macrae & Co.
Western Atlas International Inc.
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