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Neutron logger

A logging instrument and neutron technology, applied in the field of logging instruments, can solve the problems of inability to quantitatively evaluate gas saturation in tight gas reservoirs, strong heterogeneity, and difficulty in evaluating tight gas reservoirs.

Inactive Publication Date: 2017-12-15
CHENGDU NEWRAY TECH CO LTD
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Problems solved by technology

However, due to the complex framework minerals and strong heterogeneity of tight gas reservoirs, there are great difficulties in the evaluation of tight gas reservoirs
[0004] Scholars at home and abroad have used logging tools and technologies such as Reservoir Performance Monitor (RPM), Thermal Neutron Decay Time Logging Tool (TDT), Through-Casing Resistivity Logging (CHRF), and Nuclear Magnetic Resonance Logging (NMR) Evaluation of tight gas reservoirs, but the evaluation effect is not good, and the gas saturation of tight gas reservoirs cannot be quantitatively evaluated

Method used

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  • Neutron logger

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Embodiment Construction

[0010] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. For simplicity, some technical features known to those skilled in the art are omitted from the following description.

[0011] like figure 1 As shown, this embodiment provides a neutron logging tool, including a pulsed neutron source, a detector group, a front-end circuit system for compensating the neutron logging tool, and a data analysis module for obtaining measured data; The detector group includes a first thermal neutron detector, a second thermal neutron detector and a third thermal neutron detector, wherein the first thermal neutron detector is the closest to the pulsed neutron source, and the second thermal neutron detector is the closest to the pulsed neutron source. The pulsed neutron source is far away, and the third therma...

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Abstract

The invention relates to the technical field of logging tools, in particular to a neutron logging tool, including a pulsed neutron source, a detector group, a front-end circuit system for compensating the neutron logging tool, and data for obtaining measured data Analysis module; the detector group includes a first thermal neutron detector, a second thermal neutron detector and a third thermal neutron detector, wherein the first thermal neutron detector is closest to the pulsed neutron source, and the second thermal neutron detector is the closest to the pulsed neutron source. The sub-detectors are far away from the pulsed neutron source, and the third thermal neutron detector is farthest away from the pulsed neutron source; the front-end circuit system includes a charge-sensitive amplifier, a differential amplifier coupled with the charge-sensitive amplifier, a comparator, and a pulse shaping circuit.

Description

technical field [0001] The invention belongs to the technical field of well logging instruments, and in particular relates to a neutron well logging instrument. Background technique [0002] In recent years, the production of conventional oil has entered a downward trend, and with the high international oil price, the exploration and development of unconventional energy has attracted great attention from the energy circles at home and abroad. Unconventional oil and gas accounts for an increasing proportion of global oil and gas production, and has already played an important role in the global energy structure. [0003] Tight gas is an important unconventional natural gas resource, which means that in sandstone reservoirs with low porosity, low permeability or even ultra-low porosity and permeability, there is no natural production capacity or the natural production capacity is very low, and industrial gas flow needs to be formed through fracturing or special means natural ...

Claims

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Application Information

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IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 葛良全曾国强郭生良张庆贤
Owner CHENGDU NEWRAY TECH CO LTD
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