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Controllable-neutron three-detector element well logging device and method

A detector element and detector technology, which is applied in the field of oil and natural gas exploration, can solve the problems such as the influence of the variety of element oxide species on the accuracy of element content calculation, and achieve the effect of overcoming dependence and broadening the scope of application.

Active Publication Date: 2017-12-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0011] The above-mentioned patents or documents introduce some existing methods for determining element content by using capture gamma or inelastic gamma energy spectroscopy, but they need to rely on the oxide closed model, so the calculation accuracy of element content is limited by the diversity of element oxides Impact

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Embodiment Construction

[0033] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0034] Such as figure 1 As shown, a controllable neutron three-detector element logging device, the device generally performs continuous depth measurement in the borehole 10, the borehole is generally filled with mud, and the surrounding of the borehole is the formation 9, including a cylindrical shell , a D-T controllable neutron source 1, a near-He-3 thermal neutron detector 2, a LaBr 3 Gamma detector 4, photomultiplier tube 6, ultra-distant He-3 thermal neutron detector 7 and telemetry subsection 8, near He-3 thermal neutron detector 2 and LaBr 3 A tungsten shielding material 3, LaBr 3 The outer side of the detector 4 is equipped with a high-capture boron material 5 , and the telemetry sub-section 8 performs signal demodulation and processing on the measurement information, and finally uploads it to the ground control ...

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Abstract

The invention discloses a controllable-neutron three-detector element well logging device and method, which specifically relate to the field of oil and natural gas exploration. The device uses a D-T controllable neutron source, a near He-3 neutron detector, a LaBr3 crystal gamma detector, and a super far He-3 thermal neutron detector. The two He-3 neutron detectors collect the time spectrum of neutrons and the total count of neutrons. The LaBr3 gamma detector collects inelastic and capture gamma time spectrums, and measurement information is uploaded to ground equipment through a telemetry pipe nipple of the instrument. The method includes the following steps: first, processing the inelastic gamma energy spectrum, calculating the inelastic gamma yield of elements, and calculating the dry weights of Si, C and other elements according to the inelastic yield of elements, the near-to-super far neutron counting ratio and other information; and then, processing the capture gamma energy spectrum, calculating the capture yield of elements, and calculating the contents of elements which can be measured by the capture gamma energy spectrum, such as Ca, S and Fe, according to the contents of elements determined by inelastic gamma and the capture yield.

Description

technical field [0001] The invention relates to the field of oil and natural gas exploration, in particular to a controllable neutron three-detector element logging device and method. Background technique [0002] Currently, there are a variety of well logging methods and devices that can determine the content of elements in downhole formations. Representative ones include Schlumberger’s ECS (Elemental Capture Spectroscopy), Halliburton’s GEM (Geochemical logging), and Baker Hughes’ FLeX (Formation Lithology eXplorer) and Schlumberger's LithoScanner element logging tool. Among them, ECS and GEM adopt Am-Be isotope neutron source and single BGO gamma detector. FLeX and Litho Scanner use the D-T controllable neutron source, the former uses a BGO gamma detector, and the latter uses a high-resolution LaBr 3 Gamma detector. The neutron source of the instrument emits neutrons into the wellbore and the formation. When the neutron energy is high, it can inelastically scatter with...

Claims

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Application Information

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IPC IPC(8): G01V5/14
CPCG01V5/14
Inventor 刘军涛张锋张泉滢遆永周李向辉田立立陈前
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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