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US 12,378,882 B2Granted
Method for performing Raman spectroscopy within a logging while drilling instrument
AssigneeSchlumberger Technology Corporation
InventorsHarold Pfutzner, Bastian Sauerer
Life of this patent
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Abstract
A downhole tool has a tool body with an outer diameter equal to a borehole diameter, at least one cavity formed in and opening to an outer surface defining the outer diameter of the tool body, a light source, a filter, and a light detector mounted in the at least one cavity, and a window disposed at the opening of the at least one cavity, wherein the window encloses the cavity.
Claims17
A method, comprising:
- cutting a fresh surface in a wall of a borehole extending through a formation with one or more blades of a downhole tool;
- taking a Raman spectroscopy measurement of the fresh surface from within the borehole extending through the formation before the fresh surface is exposed to borehole fluids with a Raman spectroscopy measurement system, the Raman spectroscopy measurement system including:
- a light source disposed in a first cavity in an outer surface of a blade of the one or more blades, wherein the first cavity is enclosed by a first window flush with the outer surface of the blade;
- a filter disposed in a second cavity in the outer surface of the blade, wherein the second cavity is enclosed by a second window flush with the outer surface of the blade;
- and
- a light detector disposed in the second cavity;
- generating a Raman spectrum from the Raman spectroscopy measurement;
- and
- determining kerogen maturity in the formation from the Raman spectrum.
6 more elements
A method, comprising:
- drilling a borehole through a formation;
- cutting a fresh surface in a wall of the borehole with one or more blades of a downhole tool;
- taking a Raman spectroscopy measurement of the fresh surface within the borehole during the drilling to obtain a Raman spectrum before the fresh surface is exposed to borehole fluids with a Raman spectroscopy measurement system, the Raman spectroscopy measurement system including:
- a light source disposed in a first cavity in an outer surface of a blade of the one or more blades, wherein the first cavity is enclosed by a first window flush with the outer surface of the blade;
- a filter disposed in a second cavity in the outer surface of the blade, wherein the second cavity is enclosed by a second window flush with the outer surface of the blade;
- and
- a light detector disposed in the second cavity;
- determining kerogen maturity in the formation from the Raman spectrum;
- and
- geo-steering the drilling of the borehole based on the kerogen maturity.
7 more elements
A method, comprising:
- deploying a downhole tool into a borehole extending through a formation, wherein the downhole tool comprises:
- a tool body one or more blades extending radially from the tool body;
- a first cavity formed in an outer surface of a blade of the one or more blades, wherein a first window encloses the first cavity and is flush with the outer surface of the blade;
- a light source mounted in the first cavity;
- a filter mounted in the at least one a second cavity formed in the outer surface of the blade, wherein a second window encloses the second cavity and is flush with the outer surface of the blade;
- and
- a light detector mounted in the second cavity, wherein the light source and the light detector are configured to rake back-scatter measurements;
- cutting a fresh surface in a wall of the borehole with the downhole tool with the one or more blades;
- taking a Raman spectroscopy measurement of the fresh surface from within the borehole with the downhole tool to obtain a Raman spectrum before the fresh surface is exposed to borehole fluids;
- determining kerogen maturity in the formation from the Raman spectrum;
- and
- geo-steering drilling of the borehole based on the kerogen maturity.
9 more elements
Dependencies are inferred from the claim text.