Pulsed neutron logging for petrolithium
AssigneeWeatherford Technology Holdings, LLC
InventorsGregory Schmid, Richard Pemper, Natasa Mekic
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Abstract
Methods, tools, and systems for determining the lithium concentration of a formation traversed by a wellbore using pulsed neutron logging are described. Since determining lithium directly using pulsed neutron logging is problematic, this disclosure provides ways of determining lithium concentration indirectly using models that relate lithium concentration with concentrations of other elements that are predicted to be associated with lithium.
Claims22
A method of determining a concentration of lithium contained within a brine in a formation traversed by a wellbore, the method comprising:
- using data from a pulsed neutron logging tool in the wellbore to determine a concentration of one or more proxy elements in the brine, wherein the one or more proxy elements do not comprise lithium, and
- using the determined concentration of the one or more proxy elements to determine the concentration of lithium in the brine.
A non-transitory computer-readable medium comprising instructions for execution by a computer for determining a concentration of lithium contained within a brine in a formation traversed by a wellbore, wherein the instructions are configured to cause the computer to:
- receive data generated using a pulsed neutron logging tool in the wellbore,
- use the data to determine a concentration of one or more proxy elements in the brine, wherein the one or more proxy elements do not comprise lithium, and
- use the determined concentration of the one or more proxy elements to determine the concentration of lithium in the brine.
Dependencies are inferred from the claim text.