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US 2026/0259344 A1Published application
Techniques for predicting co2 saturation in formations based on nuclear magnetic resonance data
AssigneeSchlumberger Technology Corporation
InventorRobert Laronga
Life of this patent
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Abstract
Systems and methods for applying a cutoff or gaussian distribution, however measured, derived, or conceived, in the T1 domain, in the T2 domain, or in the two-dimensional T1-T2 domain to a Nuclear Magnetic Resonance (NMR) log acquired in a well, thereby predicting a fraction of a fluid that will be replaced by carbon dioxide (CO2) in response to the CO2 being introduced into a reservoir pore system (e.g., the pore system of reservoir rock of a geological formation and the fluid it contains).
Claims22
A method comprising:
- deploying a Nuclear Magnetic Resonance (NMR) tool into a wellbore extending through a geological formation as part of a reservoir pore system;
- utilizing the NMR tool to acquire an NMR log comprising NMR log data relating to the geological formation extracting a core sample from the geological formation using core extraction equipment;
- deriving a cutoff or gaussian distribution based at least in part on analysis of the core sample;
- and
- applying the cutoff or gaussian distribution in at least one domain to the NMR log data to predict a fraction of a fluid that will be replaced by carbon dioxide (CO2) in response to the CO2 being injected into the reservoir pore system.
2 more elements
A method comprising:
- deploying a Nuclear Magnetic Resonance (NMR) tool into a wellbore extending through a geological formation as part of a reservoir pore system;
- utilizing the NMR tool to acquire an NMR log comprising NMR log data relating to the geological formation;
- extracting a core sample from the geological formation using core extraction equipment;
- deriving a cutoff, gaussian distribution, or differential gaussian distribution based at least in part on analysis of the core sample;
- and
- applying the cutoff, gaussian distribution, or differential gaussian distribution in at least one domain to the NMR log data to predict a fraction of carbon dioxide (CO2) that will be residually trapped by capillary pressure hysteresis.
3 more elements
A method comprising:
- deploying a Nuclear Magnetic Resonance (NMR) tool into a wellbore extending through a geological formation as part of a reservoir pore system;
- utilizing the NMR tool to acquire an NMR log comprising NMR log data relating to the geological formation;
- extracting a core sample from the geological formation using core extraction equipment;
- deriving one or more coefficients, one or more numerators, or one or more shift factors based at least in part on analysis of the core sample;
- and
- applying the one or more coefficients, one or more numerators, or one or more shift factors to convert all or part of one or more NMR distributions of the NMR log data to predicted capillary pressure distributions relevant to carbon dioxide (CO2) being injected into the reservoir pore system.
3 more elements
Dependencies are inferred from the claim text.