Prismatic grid inversion for oil saturation and 3-phase holdup
AssigneeHalliburton Energy Services, Inc.
InventorMayir Mamtimin
Life of this patent
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Abstract
A method of determining downhole formation oil saturation and three-phase holdup is described. The method includes lowering a pulsed-neutron logging tool downhole with a near detector and a far detector. The method further includes measuring a carbon to oxygen ratio from the near detector, measuring a carbon to oxygen ratio from the far detector, measuring a ratio of inelastic count rates, and plotting the measured ratios in a prismatic grid. The method further includes visualizing the fluid volumetrics around the pulsed-neutron logging tool.
Claims10
A method comprising:
- lowering a pulsed-neutron logging tool downhole comprising a near detector and a far detector;
- measuring a carbon to oxygen ratio from the near detector;
- measuring a carbon to oxygen ratio from the far detector;
- measuring a ratio of inelastic count rates, wherein the ratio of inelastic count rates is a ratio of near detector inelastic count rates to far detector inelastic count rates;
- and
- plotting the measured ratios in a prismatic grid.
A system for visualizing fluid volumetrics around a pulsed neutron logging tool comprising:
- a pulsed-neutron logging tool comprising a near detector and a far detector;
- and
- a prismatic grid with Cartesian coordinates, wherein one coordinate corresponds to a carbon to oxygen ratio from the near detector, another coordinate corresponds to a carbon to oxygen ratio from the far detector, and a third coordinate corresponds to a ratio of inelastic count rates, wherein the ratio of inelastic count rates is a ratio of near detector inelastic count rates to far detector inelastic count rates.
A system for visualizing boundaries of a relative change of a formation oil saturation (So) and an oil holdup (Yo) around a pulsed neutron logging tool comprising:
- a pulsed-neutron logging tool comprising a near detector and a far detector;
- and
- a prismatic grid with Cartesian coordinates, wherein one coordinate corresponds to a carbon to oxygen ratio from the near detector, another coordinate corresponds to a carbon to oxygen ratio from the far detector, and a third coordinate corresponds to a ratio of inelastic count rates, wherein the ratio of inelastic count rates is a ratio of near detector inelastic count rates to far detector inelastic count rates.
Dependencies are inferred from the claim text.