Method and apparatus for determining density of earth formations
AssigneeSchlumberger Technology Corporation
InventorMichael L. Evans
Life of this patent
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Abstract
Apparatus for determining the density of underground formations surrounding a borehole, such as a wireline logging tool or a logging-while-drilling tool, includes a high energy neutron source for irradiating the formations from within the borehole and a detector which detects gamma rays in the borehole resulting from the irradiation of the formations with high energy neutrons. The detected gamma rays are analyzed to determine the density of the formations.
Claims20
A method of determining the density of underground formations surrounding a borehole, comprising:
- a) irradiating the formations with high energy neutrons from within the borehole;
- b) detecting gamma rays in the borehole resulting from the irradiation with high energy neutrons;
- and
- c) analyzing the detected gamma rays to determine the density of the formations.
A method of determining the density of underground formations surrounding a borehole, comprising:
- a) creating a source of gamma rays in the formations by irradiating the formations from within the borehole;
- b) detecting gamma rays from the source in the borehole;
- and
- c) analyzing the detected gamma rays to determine the density of the formations.
Apparatus for determining the density of underground formations surrounding a borehole, comprising:
- a) a tool body;
- b) a high energy neutron source in the tool body for irradiating the formations from within the borehole;
- c) a detector which detects gamma rays in the borehole resulting from the irradiation of the formations with high energy neutrons;
- and
- d) means for analyzing the detected gamma rays to determine the density of the formations.
Dependencies are inferred from the claim text.