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Impulse neutron complete spectrum saturability logging instrument variable parameter neutron pulse timing mode

A technology of pulsed neutrons and pulse timing, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of large Σ parameter fluctuation error and Σ logging data can not be applied, etc., so as to reduce fluctuation error, increase gate count rate, Effect of increasing the gate count rate

Active Publication Date: 2008-09-03
XIAN AOHUA ELECTRONICS INSTR +1
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Problems solved by technology

[0003] The purpose of the present invention is to provide a variable parameter neutron pulse timing mode of pulse neutron full-spectrum saturation logging tool, which solves the technical problem that the fluctuation error of Σ parameter in the background technology is so large that the Σ logging data cannot be applied

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  • Impulse neutron complete spectrum saturability logging instrument variable parameter neutron pulse timing mode
  • Impulse neutron complete spectrum saturability logging instrument variable parameter neutron pulse timing mode

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[0019] The neutron pulse timing mode of the present invention is the time mode of the fast neutron emission of the neutron tube. Take Ta=10·Tb as a large period, which includes two periods of Tc and Tb. The carbon-oxygen ratio is measured during the Tc period. In this period, there are many Δt2 small periods (that is, the neutron period during the carbon-oxygen ratio measurement). In the Δt2 small period, the neutron tube emits fast neutrons only during the Δt1 time. During the Tb period, the thermal neutron capture cross section Σ measurement is made, and fast neutrons are only emitted during the T time at the beginning of Tb.

[0020] Δt1 and Δt2 are designed according to the optimal requirements of carbon-oxygen ratio logging, and once selected, they are fixed. For example, Δt2 chooses 100μs, and Δt1 chooses 10.5μs.

[0021] The capture cross-section Σ of the oil drilling formation is usually in the range of 7.6 C.U. to 91 C.U., and the corresponding neutron lifetime τ is...

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Abstract

The present invention relates to a neutron pulse timing mode for pulse neutron whole spectrum saturation logging tool, emitting rapid neutron continuously by broad pulse design, and adding the neutron emitting time corresponding, resolves technique problem that great fluctuation error of Sigma parameter in present neutron pulse timing mode cause Sigma detecting well data can't be used, enhances the gate counting rate of monitoring Sigma and reduces the fluctuation error of Sigma parameter, reaches the similar effect near to result by special Sigma measuring apparatus.

Description

technical field [0001] The invention relates to a neutron pulse timing mode of a pulse neutron full-spectrum saturation logging tool. Background technique [0002] The neutron pulse timing mode used in the carbon-oxygen ratio logging method (also measuring the thermal neutron capture cross section Σ) of the existing similar instruments for measuring ∑ parameters is a fixed parameter mode. Since the parameters in the neutron pulse timing mode are set in advance, when the neutron lifetime τ value is small, the thermal neutron decays quickly, resulting in the time behind one cycle not being fully utilized, resulting in a very low gate count rate. Low. Although the logging speed is very low (60 m / s), the fluctuation error of the monitored Σ parameter is so large that the Σ logging data cannot be used. Contents of the invention [0003] The purpose of the present invention is to provide a variable parameter neutron pulse timing mode of pulse neutron full-spectrum saturation l...

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Application Information

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IPC IPC(8): E21B49/00G01V5/10
Inventor 赵智勇张德民杨金锁宋胜泽王庆徐建平汪永安杨联会杨连会董谦石丽云
Owner XIAN AOHUA ELECTRONICS INSTR
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