Dual spaced epithermal neutron detector porosity logging with AcBe source专利检索-中子探测器传感器与探测器专利检索查询-专利查询网

Dual spaced epithermal neutron detector porosity logging with AcBe source

阅读：798发布：2021-04-10

专利汇可以提供Dual spaced epithermal neutron detector porosity logging with AcBe source专利检索，专利查询，专利分析的服务。并且An illustrative embodiment of the invention includes method and apparatus for making earth formation porosity measurements in open or cased well boreholes. A relatively high intensity (108 neutrons/sec.) actinium-beryllium neutron source is used to irradiate earth formations surrounding a well borehole with high energy neutrons. As the high energy neutrons interact with the materials comprising the earth formation their energy is reduced and some having epithermal energy are deflected back into the borehole at spaced distances from the neutron source. Two epithermal energy neutron detectors spaced at different vertical distances from the neutron source and from each other are used to measure the epithermal neutron population at the different distances. The ratio of the counting rates in the two detectors may be interpreted in terms of earth formation porosity by means of a predetermined relationship.，下面是Dual spaced epithermal neutron detector porosity logging with AcBe source专利的具体信息内容。

权利要求

1. A method for measuring the porosity of earth formations in the vicinity of a well borehole comprising the steps of: irradiating the earth formations in the vicinity of the borehole with fast neutrons from a relatively high intensity actiniumberyllium neutron source; detecting essentially only the epithermal neutron population at a first spaced distance from said source in the borehole; detecting essentially only the epithermal neutron population at a second different spaced distance from said source in the borehole; discriminating against the detection of the thermal neutron population at said detectors in the borehole; and combining the epithermal neutron population measurements made at said two different spaced distances to derive an indication of formation porosity.

2. The method of claim 1 wherein the step of combining said epithermal neutron population measurements includes taking a ratio of said measurements to provide an indication of the hydrogen index of said earth formations.

3. The method of claim 1 wherein the irradiating step is performed by irradiating the earth formations in the vicinity of the well borehole with a neutron source comprising an actinium-beryllium source emitting approximately 108 neutrons/sec.

4. The method of claim 3 wherein the two epithermal neutron detecting steps are performed at spaced distances of about 46 and 76 cm from said actinium-beryllium neutron source by employing cadmium wrapped He3 detectors having effective sensitive centers at these distances.

5. Apparatus for measuring a porosity related characteristic of earth formations in the vicinity of a well borehole comprising: a fluid tight body member sized for passage in a borehole and housing; a relatively high intensity source of fast neutrons comprising an actinium-beryllium source; a first epithermal neutron detector spaced a first longitudinal distance from said neutron source; a second epithermal neutron detector spaced a second different longitudinal distance from said neutron source; shielding means for discriminating against the detection of thermal neutrons at said two different spaced epithermal neutron detectors; and means responsive to signals from said epiThermal neutron detectors to generate a signal related to a porosity characteristic of the earth formations in the vicinity of the borehole.

6. The apparatus of claim 5 wherein said neutron source comprises an actinium-beryllium source capable of emitting approximately 108 neutrons/sec.

7. The apparatus of claim 6 wherein said first epithermal neutron detector is spaced with its effective sensitive center 46 cm from the effective center of said neutron source and said second epithermal neutron detector is spaced with its effective sensitive center approximately 76 cm from the effective center of said neutron source.

8. The apparatus of claim 7 wherein said epithermal neutron detectors comprise He3 neutron detectors embedded in a neutron moderating material and the whole surrounded by a thermal neutron absorbing material, said near detector comprising a detector being about 1 inch in diameter and 4 inches long and said far detector being about 2 inches in diameter and 4 inches long and said near detector containing He3 at 2 atmospheres pressure and said far detector containing He3 at 20 atmospheres pressure.

9. The apparatus of claim 8 wherein said He3 neutron detectors are embedded in lucite plastic material and the whole is surrounded by a cadmium shield approximately 0.020 inches thick.

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Dual spaced epithermal neutron detector porosity logging with AcBe source

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