Gamma ray detector in carbon/oxygen spectral logging system with alpha particles
A technology of energy spectrum logging and carbon-oxygen ratio, applied in the field of detectors, can solve problems such as signal interference, achieve the effects of eliminating interference factors, ensuring logging accuracy, and enhancing layering capabilities
Inactive Publication Date: 2013-01-02
BC P INC CHINA NAT PETROLEUM CORP +1
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[0003] In order to solve the problem that there is a large signal interference between the spectral signal and the fast signal obtained by the existing gamma-ray detector, which leads to the problem that the logging accuracy is reduced, the present invention provides a new carbon-oxygen ratio of accompanying alpha particles The gamma-ray detector in the energy spectrum logging system can fundamentally eliminate the interference factors caused by the signal multiplication process after using this gamma-ray detector, effectively solve the problem of mutual interference between the two signals, and ensure the logging precision
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[0010] The present invention will be further described below in conjunction with accompanying drawing:
[0011] like figure 1 As shown, the gamma-ray detector in this kind of carbon-oxygen ratio energy spectrum logging system accompanied by α particles includes a probe main casing 7 with a spectral signal and a high-voltage signal access hole 12 at the bottom and a belt in the probe main casing 7. There is a cylindrical scintillator 6 with a scintillator sheath 8, and most importantly, there are two photomultiplier tubes in the main housing 7 of the probe, namely a fast gamma signal photomultiplier 5 and a spectral gamma signal photomultiplier 9 . After the top and the bottom of the cylindrical scintillator 6 are polished and windowed, they are respectively connected to the photocathodes of the two photomultiplier tubes, and optical silicone oil is applied to the corresponding joints as an optical coupler; the spectral gamma signal photomultiplier tube The anode of 9 output...
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The invention relates to a gamma ray detector in a carbon / oxygen spectral logging system with alpha particles, which mainly solves the problem that larger signal interference exists between spectral signals and fast signals acquired by the traditional gamma ray detector in a carbon / oxygen instrument with alpha particles and causes the reduction of the logging accuracy. The gamma ray detector is characterized in that two photomultipliers are arranged in a main shell of a probe; after planes at the top and the bottom of a cylindrical scintillator are polished to form windows, the planes at the top and the bottom of the cylindrical scintillator are respectively connected with the photocathodes of the two photomultipliers; the photoanodes of the two photomultipliers respectively output spectral signals and fast signals independently; optical silicone oil is smeared at the corresponding joint of the scintillator with the scintillator to be used as an optical coupling agent; and after a fast gamma signal photomultiplier and a spectral gamma signal photomultiplier are closely connected with the cylindrical scintillator, corresponding signal wires and high-voltage power supply wires respectively pass through signal outlet holes at two ends. After the gamma ray detector is used, the interference factors generated in the signal multiplication process can be basically eliminated, therebyensuring the logging accuracy.
Description
Technical field: [0001] The present invention relates to a detector used in well logging with α-particle carbon-oxygen ratio energy spectrum in an oil field, in particular to a gamma-ray detection applied in a carbon-oxygen ratio energy spectrum logging system with α-particles device. Background technique: [0002] When the 14MeV fast neutron interacts with the nucleus, the neutron is absorbed by the nucleus to form a composite nucleus, and then the neutron is emitted at a lower energy, and the nucleus remains in an excited state. The excited nuclei generally return to the ground state by emitting γ-rays. This process is called inelastic scattering. The carbon-oxygen ratio logging system accompanied by α particles is an improved carbon-oxygen ratio logging system based on the fast neutron inelastic scattering theory. It includes a neutron tube with an alpha particle signal acquisition device, a gamma detector for measuring directly inelastically scattered gamma rays induce...
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IPC IPC(8): E21B47/00G01V5/12
Inventor 丁希金徐成褚庆军
Owner BC P INC CHINA NAT PETROLEUM CORP