Non-Invaded Formation Density Measurement and Photoelectric Evaluation Using an X-Ray Source
An x-ray based litho-density tool for measurement of simultaneous invaded and non-invaded formation surrounding a borehole is provided, the tool including at least an internal length comprising a sonde section, wherein sonde section further includes an x-ray source; at least one radiation measuring detector; at least one source monitoring detector; and a plurality of sonde-dependent electronics. In various embodiments, the tool uses x-rays to illuminate the formation surrounding a borehole, and a plurality of detectors are used to directly measure both invaded and non-invaded formation bulk densities. Detectors used to measure borehole standoff such that other detector responses may be compensated for tool standoff; long and ultra-long space detectors disposed in electromagnetic communication with a source located within a collimated tungsten radiation shield; and wear-pads disposed such that the source and detector assembly may be pressed against the side of the borehole to reduce borehole effects are also provided.
1 . An x-ray based litho-density tool for measurement of simultaneous invaded and non-invaded formation surrounding a borehole, said tool comprising:
an internal length comprising a sonde section, wherein said sonde section further comprises an x-ray source; at least one radiation measuring detector; at least one source monitoring detector; and a plurality of sonde-dependent electronics.
2 . The tool of claim 1 , further comprising a plurality of tool logic electronics and PSUs.
3 . The tool of claim 1 , wherein the tool uses x-rays to illuminate the formation surrounding a borehole, and a plurality of detectors are used to directly measure both invaded and non-invaded formation bulk densities.
4 . The tool of claim 1 , further comprising a detector used to measure borehole standoff such that other detector responses may be compensated for tool standoff.
5 . The tool of claim 1 , further comprising a long space detector; an ultra-long space detector; and a source located within a collimated radiation shield.
6 . The tool of claim 5 , wherein said shield further comprises tungsten.
7 . The tool of claim 1 , wherein the tool is configured so as to permit through-wiring.
8 . The tool of claim 1 , wherein the tool further comprises a wear-pad disposed such that the source and detector assembly may be pressed against the side of the borehole to reduce borehole effects.
9 . The toot of claim 1 , wherein the reference detector is used to monitor the output of the x-ray source.
10 . tool of claim 1 , wherein the short-space is configured to distribute incoming photons into energy classifications, such that photoelectric measurements may be made.