Methods for thermal neutron diffusion coefficient logging
阅读：972发布：2022-05-08
专利汇可以提供Methods for thermal neutron diffusion coefficient logging专利检索，专利查询，专利分析的服务。并且An illustrative embodiment of the present invention includes methods for thermal neutron diffusion coefficient logging. Two spaced thermal neutron detectors are deployed at different distances from a pulsed source of 14 MEV neutrons. Each detector samples the thermal neutron population over two different time intervals following the emission of a burst of neutrons by the source. Count signals from the detectors are combined according to predetermined relationships to derive signals representative of the thermal neutron diffusion coefficient, the initial neutron age, the porosity and the water saturation of the earth formations in the vicinity of the borehole.，下面是Methods for thermal neutron diffusion coefficient logging专利的具体信息内容。
1. A method for determining the thermal neutron diffusion coefficient of earth formations in the vicinity of a well borehole comprising the steps of: repetitively irradiating earth formations surrounding a well borehole with bursts of fast neutrons from a neutron source; subsequent to a neutron burst, detecting at, at least two different spaced distances from said neutron source and during at least two different time intervals, the thermal neutron population in the well borehole and generating at least four count signals representative of the detected thermal neutron population at said at least two different spaced distances at said at least two different time intervals; generating a first count ratio signal representative of the ratio of said count signals at the two different spaced detectors during said first time interval subsequent to said neutron burst; generating a second count ratio signal representative of the ratio of said count signals at the two different spaced detectors during said second time interval subsequent to said neutron burst; and combining said first and second count ratio signals according to a predetermined relationship to generate a signal representative of the thermal neutron diffusion coefficient in the vicinity of the well borehole.
2. The method of claim 1 wherein said at least two different time intervals subsequent to a neutron burst are selected so as to occur at a sufficient time after said neutron burst to allow borehole effects to substantially vanish.
3. The method of claim 2 and further including the step of using said signal representative of the thermal neutron diffusion coefficient to derive according to a predetermined relationship a signal representative of the porosity of the earth formations in the vicinity of the well borehole.
4. The method of claim 2 and further including the step of using said signal representative of the thermal neutron diffusion coefficient to derive according to a predetermined relationship a signal representative of the intrinsic thermal neutron lifetime of earth formations in the vicinity of the well Borehole.
5. The method of claim 2 and further including the steps of using said signal representative of the thermal neutron diffusion coefficient to derive according to a predetermined relationship signals representative of the porosity phi and intrinsic thermal neutron lifetime TO of earth formations in the vicinity of the well borehole and using said phi and TO representative signals to derive a signal representative of the water saturation Sw of earth formations in the vicinity of the well borehole.
6. The method of claim 5 and further including the steps of repeating said measurements at different depths and recording said representative signals as a function of borehole depth.
7. A method for determining enhanced porosity values of earth formations in the vicinity of a well borehole comprising the steps of: repetitively irradiating earth formations in the vicinity of a well borehole with bursts of fast neutrons from a neutron source; subsequent to a neutron burst detecting at, at least two different spaced distances from said neutron source and during at least two different time intervals, the thermal neutron population in the well borehole and generating at least four count signals representative of the detected thermal neutron populations at said at least two different spaced distances at said at least two different time intervals; generating a first count ratio signal representative of the ratio of said count signals at the two different spaced detectors during said first time interval subsequent to said neutron burst; generating a second count ratio signal representative of the ratio of said count signals at the two different spaced detectors during said second time interval subsequent to said neutron burst; generating from said first and second count ratio signals and from said representative neutron population signals, and according to predetermined relationships signals representative of the thermal neutron diffusion coefficient D and the initial neutron age Tau O of the earth formations in the vicinity of the well borehole; and generating from said diffusion coefficient D signals and said neutron age Tau O signals, signals representative of the porosity phi of earth formations in the vicinity of the well borehole according to predetermined relationships.
8. The method of claim 7 wherein the neutron populations are sampled at said different distances and over said different time intervals after the neutron burst at a sufficient time after said burst to allow borehole effects to substantially vanish.
9. The method of claim 8 and further including the step of using said representative porosity signal and said representative neutron diffusion coefficient signal to derive a signal representative of the intrinsic thermal neutron lifetime TO of earth formations in the vicinity of the well borehole.
10. The method of claim 9 wherein the steps are repeated at different depth levels in the wellbore and said representative signals are recorded as a function of borehole depth.
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