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Multi-source spacing measurement device and method for neutron porosity during drilling

A neutron porosity and measuring device technology, applied in the field of petroleum drilling engineering, can solve the problem that the sensitivity of the probe and the accuracy of the data cannot be satisfied at the same time, and achieve the effect of real-time evaluation of the formation and guarantee of the accuracy of the data.

Active Publication Date: 2018-03-23
BC P INC CHINA NAT PETROLEUM CORP +2
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Problems solved by technology

However, due to the fixed source distance between the near and far detectors relative to the neutron generator, this device cannot meet the requirements of detector sensitivity and data accuracy at the same time.

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  • Multi-source spacing measurement device and method for neutron porosity during drilling
  • Multi-source spacing measurement device and method for neutron porosity during drilling
  • Multi-source spacing measurement device and method for neutron porosity during drilling

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Embodiment Construction

[0042] see Figure 1 to Figure 5 , shows the multi-source distance while drilling neutron porosity measuring device and its measuring method of the present invention.

[0043] Wherein said multi-source distance while drilling neutron porosity measurement device can include non-magnetic drill collar 2, neutron emission unit, fast neutron monitoring unit, thermal neutron detection unit and control unit, through the combination of these units, this The applied multi-source distance while drilling neutron porosity measurement device can convert the detection data into neutron porosity results according to different working conditions through a preset program downhole.

[0044] Wherein, the neutron emission unit may include a plurality of accelerator neutron sources 3, and a plurality of accelerator neutron sources 3 are arranged on the inner wall of the mud channel 1 at the same height along a certain angle interval, and the plurality of accelerator neutron sources 3 are all With...

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Abstract

The invention discloses a multi-source spacing measurement device and method for neutron porosity during drilling. The measurement device includes a non-magnetic drill collar, a neutron emission unit,a fast neutron monitoring unit, a hot neutron detecting unit and a control unit; the neutron emission unit contains multiple accelerator neutron sources, the fast neutron monitoring unit includes multiple fast neutron monitor groups, the hot neutron detecting unit includes multiple hot neutron detector groups, and the control unit is connected to the neutron emission unit, the fast neutron monitoring unit and the hot neutron detecting unit separately. The multi-source spacing measurement device and method for the neutron porosity during drilling overcome the defects in the prior art, ensure the flexibility and data accuracy of detecting instruments under a complex geologic condition, effectively reduce the influences of well hole parameters, vibration, impact and random fluctuation of measurement data on the measurement result, solve problems in prior art, remove limitations in the prior art, and achieve accurate acquirement of stratum porosity parameters.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling engineering, in particular to a multi-source distance neutron porosity measurement device while drilling and a measurement method thereof. Background technique [0002] Neutron porosity measurement while drilling is a measurement-while-drilling method that utilizes the interaction between neutrons and the formation to obtain formation porosity parameters. The porosity and other lithological parameters of the formation can be obtained through the energy and intensity changes after the interaction with the nuclei of each element in the formation (including inelastic scattering, elastic scattering, radiation capture, activation, etc.). [0003] The early neutron porosity measurement technology was mainly used in wireline logging, and then gradually developed into logging while drilling. The neutron sources are mainly divided into isotope neutron source and accelerator neutron source, and t...

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Application Information

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IPC IPC(8): E21B49/00E21B47/00
CPCE21B47/00E21B49/00
Inventor 李万军毛为民王刚艾维平周海秋洪迪峰吴萌滕鑫淼王俊峰王鹏顾亦新贾衡天张华北童振林云涛
Owner BC P INC CHINA NAT PETROLEUM CORP
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