Inelastic gamma ray logging system专利检索-快中子中子化学元素和化合物专利检索查询-专利查询网

Inelastic gamma ray logging system

阅读：197发布：2021-03-08

专利汇可以提供Inelastic gamma ray logging system专利检索，专利查询，专利分析的服务。并且An illustrative embodiment of the invention includes a system for providing inelastic neutron gamma ray measurements in a well borehole. A pulsed neutron source is used to irradiate earth formations in the vicinity of the borehole with 14 MEV neutrons. Gamma rays resulting from the inelastic scattering of these fast neutrons are detected by an encapsulated liquid scintillator used in conjunction with a photomultiplier. The resulting representative voltage pulses are input to pulse height analyzing apparatus having energy windows located to embrace the Compton distributions associated with calcium, silicon, oxygen and carbon. The number of counts occurring in each of these energy regions may then be interpreted in terms of quantities of interest with respect to the formations in the borehole vicinity.，下面是Inelastic gamma ray logging system专利的具体信息内容。

权利要求

1. Apparatus for determining the characteristics of material in the vicinity of a well borehole, comprising: a fluid tight hollow body member sized for passage through a well borehole and having situated therein; neutron source means for providing a flux of fast neutrons to irradiate materials in the vicinity of the borehole and liquid scintillation detector means comprising a scintillator material disposed in an essentially hydrogen free organic solvent for detecting gamma radiations attributable to the inelastic scattering of fast neutrons from materials in the vicinity of the borehole and for producing voltage pulses functionally related to the energy of the gamma radiations; and means for separating said functionally related voltage pulses into a spectrum of corresponding inelastic gamma ray energies and for recording said spectrum of inelastic gamma ray energies.

2. The apparatus of claim 1 wherein said liquid scintillation detector means comprises a scintillator material disposed in a solvent of hexaflurobenzene (C6F6).

3. The apparatus of claim 1 wherein said neutron source means comprises a pulsed source of 14 MEV neutrons and said means for separating said voltage pulses into a spectrum of corresponding inelastic gamma ray energies includes time gating means for providing said pulses to said separating means substantially coincident in time with the operation of said pulsed neutron source.

4. The apparatus of claim 1 wherein said means for separating said proportional voltage pulses includes pulse height analyzer means having pulse height channels corresponding to at least four energy channels in the inelastic gamma ray energy spectrum between 1 MEV and 8 MEV.

5. The apparatus of claim 4 wherein said at least four energy channels includes energy channels encompassing substantial portions of the Compton distributions associated with calcium, silicon, carbon and oxygen associated with the inelastic scattering of neutrons by these four elements.

6. The apparatus of claim 5 wherein said energy channels extend from approximately 1.4 to 1.6 MEV for silicon, from approximately 2.25 to 3.5 MEV for calcium, from approximately 3.5 to 4.5 MEV for carbon and from approximately 4.5 to 6.1 MEV for oxygen.

7. Apparatus for determining the characteristics of earth formation materials in the vicinity of a well borehole, comprising: a fluid tight hollow body member sized for passage through a well borehole; pulsed neutron source means in said body member for repetitively irradiating the earth formations in the borehole vicinity with relatively short duration pulses of fast neutrons; scintillation detector means comprising a scintillator material disposed in a liquid essentially hydrogen free organic solvent in said body member for detecting gamma radiations attributable to earth formation materials in the vicinity of the borehole and for producing voltage pulses functionally related to the energy thereof; means for separating said functionally related voltage pulses into a plurality of voltage pulse channels corresponding to a plurality of gamma ray energies; and time gating means for selecting as input to said means for separating said voltage pulses substantially only those pulses occurring during the operative period of said pulsed neutron source.

8. The apparatus of claim 7 wherein said solvent is hexaflurobenzene (C6F6).

9. The apparatus of claim 7 wherein said means for separating said voltage pulses into a plurality of channels comprises means for separating said voltage pulses into at least four channels corresponding to the energies encompassing substantial portions of the Compton distribution associated with calcium, silicon, carbon and oxygen caused by the inelastic scattering of fast neutrons by these four elements.

10. The apparatus of claim 9 wherein said at least four channels include channels covering the approximate energy ranges of 1.4 to 1.6 MEV for silicon, 2.25 to 3.5 MEV for calcium, 3.5 to 4.5 MEV for carbon and 4.5 to 6.1 MEV for oxygen.

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