Magnetic resonance method for characterizing fluid samples withdrawn from subsurface formations
AssigneeSchlumberger Technology Corporation
InventorRobert L. Kleinberg
Life of this patent
Estimating the term…
Abstract
Magnetic resonance techniques, e.g., nuclear magnetic resonance (NMR) and electron spin resonance (ESR), are used in a fluid sampling tool that extracts a fluid from subsurface earth formations into a flow channel within the tool. The magnetic resonance techniques involve applying a static magnetic field and an oscillating magnetic field to the fluid in the flow channel, and magnetic resonance signals are detected from the fluid and analyzed to extract information about the fluid such as composition, viscosity, etc.
Claims53
A method of analyzing a fluid in a downhole environment comprising:
- a) introducing a fluid sampling tool into a well bore that traverses an earth formation;
- b) using the fluid sampling tool to extract the fluid from the earth formation into a flow channel within the tool;
- c) applying a static magnetic field to the fluid in the flow channel;
- d) applying an oscillating magnetic field to the fluid in the flow channel;
- e) detecting magnetic resonance signals from the fluid;
- f) analyzing the detected magnetic resonance signals to extract information about the fluid.
A method of analyzing a fluid comprising:
- a) introducing a fluid sampling tool into a well bore that traverse an earth formation;
- b) using the fluid sampling tool to extract the fluid from the earth formation into a flow channel in the tool;
- c) applying a static magnetic field to the fluid in the flow channel;
- d) applying an oscillating magnetic field to the fluid in the flow channel;
- e) detecting nuclear magnetic resonance signals from the fluid, the nuclear magnetic resonance signals resulting from an interaction between nuclear spins in the fluid and the static and oscillating magnetic fields;
- and
- f) analyzing the detected nuclear magnetic resonance signals to extract information about the fluid.
A method of analyzing a fluid comprising:
- a) introducing a fluid sampling tool into a well bore that traverse an earth formation;
- b) using the fluid sampling tool to extract the fluid from the earth formation into a flow channel in the tool;
- c) applying a static magnetic field to the fluid in the flow channel;
- d) applying an oscillating magnetic field to the fluid in the flow channel;
- e) detecting electron spin resonance signals from the fluid, the electron spin resonance signals resulting from an interaction between electron spins in the fluid and the static and oscillating magnetic fields;
- and
- f) analyzing the detected electron spin resonance signals to extract information about the fluid.
An apparatus for analyzing a fluid in a downhole environment comprising:
- means for extracting the fluid from an earth formation into a flow channel within a well logging tool;
- means for generating a static magnetic field within the flow channel;
- means for generating an oscillating magnetic field within the flow channel that is substantially perpendicular direction to the static magnetic field;
- means for detecting magnetic resonance signals;
- and
- means for analyzing the detected magnetic resonance signals.
A well logging tool comprising:
- a pumpout module;
- means defining a channel that is in fluid connection with the pumpout module;
- an array of permanent magnets arranged around the channel to generate a static magnetic field within the channel;
- and
- a nuclear magnetic resonance (NMR) antenna arranged around the channel to generate an oscillating magnetic field within the channel.
A well logging tool comprising:
- a pumpout module;
- means defining a channel that is in fluid connection with the pumpout module;
- an array of permanent magnets arranged around the channel to generate a static magnetic field within the channel;
- and
- a microwave resonator arranged around the channel to generate an oscillating magnetic field within the channel.
Dependencies are inferred from the claim text.