Nuclear magnetic resonance sensing device for downhole measurements

Patent metadata

Field	Value
Publication number	US-10527748-B2
Application number	US-201615541276-A
Country	US
Kind code	B2
Filing date	Aug 8, 2016
Priority date	Aug 8, 2016
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

A nuclear magnetic resonance device for subterranean characterization includes a tool body, a peripheral measurement device, and a controller. The tool body includes a permanent magnet located therein, permanent magnet inducing a static magnetic field (B 0 ) in a region of interest. The peripheral measurement device is coupled to the tool body. The measurement device includes a radio frequency coil controllable to generate a radio frequency magnetic field (B 1 ) in the region of interest, receive a response signal, or both. The controller is communicatively coupled to the radio frequency coil and controllable to drive the radio frequency coil, process the response signal, or both.

First claim

What is claimed is:

1. A nuclear magnetic resonance device for subterranean characterization of a formation and a formation fluid, comprising:
a tool body;
a controller;
a measurement device coupled to and extendable from the tool body, the measurement device including a radio frequency coil that generates a radio frequency magnetic field (B 1 ) in response to a signal from the controller without a permanent magnet; and
a permanent magnet coupled to the tool body and separate from the measurement device, the permanent magnet generating a static magnetic field (B 0 ) in a magnetic field shape.

2. The device of claim 1 , wherein the permanent magnet comprises a transversal dipole magnet and the measurement device comprises a transversal dipole antenna, or the permanent magnet comprises a longitudinal magnet and the measurement device comprises a transversal dipole antenna.

3. The device of claim 1 , wherein B 0 is substantially orthogonal to B 1 in a region of interest.

4. The device of claim 1 , wherein the tool body is coupled to a wireline.

5. The device of claim 1 , wherein the radio frequency coil is controllable to receive a signal produced by nuclear spin induced by B 0 , B 1 , or both.

6. The device of claim 1 , wherein the measurement device comprises a soft magnetic material.

7. The device of claim 1 , wherein the radio frequency coil is drivable at an adjustable frequency and pulse scheme.

8. The device of claim 1 , wherein the permanent magnet is located within the tool body.

9. A nuclear magnetic resonance device for subterranean characterization of a formation and a formation fluid, comprising:
a tool body comprising a permanent magnet located therein, the permanent magnet inducing a static magnetic field (B 0 );
a peripheral measurement device coupled to the tool body, the measurement device comprising a radio frequency coil that is controllable to generate a radio frequency magnetic field (B i ) in the region of interest without a permanent magnet in the peripheral measurement device, receive a response signal, or both; and
a controller communicatively coupled to the radio frequency coil, the controller is controllable to drive the radio frequency coil, process the response signal, or both.

10. The device of claim 9 , wherein the measurement device is extendable towards the region of interest.

11. The device of claim 9 , wherein the radio frequency coil comprises a radial coil, a tangential coil, or both.

12. The device of claim 9 , wherein the radio frequency coil is controllable to deliver nuclear magnetic resonance pulses to the region of interest.

13. The device of claim 9 , wherein the measurement device comprises a soft magnetic material.

14. The device of claim 9 , wherein B 0 is substantially orthogonal to B 1 in a region of interest.

15. The device of claim 9 , wherein the radio frequency coil is located on a surface of the measurement device or embedded within the measurement device.

16. A method of characterizing a subterranean formation with nuclear magnetic resonance, comprising:
inducing a static magnetic field (B 0 ) via a permanent magnet coupled to or within a tool body of a nuclear magnetic resonance device, wherein the static field is induced within the tool body and within the subterranean formation;
generating a radio frequency magnetic field (B 1 ) via only a first radio frequency coil located in a measurement device coupled to and extendable from the tool body of the nuclear magnetic resonance device; and
receiving a nuclear magnetic resonance response signal via the radio frequency coil or a second radio frequency coil.

17. The method of claim 16 , further comprising driving the radio frequency coil at an adjustable frequency, pulse scheme, or both.

18. The method of claim 16 , further comprising moving the nuclear magnetic resonance device into a region of a well approximate to an area of interest.

19. The method of claim 16 , further comprising extending the measurement device from the nuclear magnetic resonance device towards a wellbore wall.

20. The method of claim 16 , further comprising processing the nuclear magnetic resonance response signal into well characterization data.

Assignees

• Halliburton Energy Services Inc

Inventors

• Li Lilong
• Chen Songhua
• Reiderman Arcady

Classifications

• G01V3/32 Primary

  operating with electron or nuclear magnetic resonance · CPC title

• E21B17/1021

  with articulated arms or arcuate springs · CPC title

• G01N24/081

  Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity · CPC title

• E21B49/08

  Obtaining fluid samples or testing fluids, in boreholes or wells · CPC title

• E21B49/00

  Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells · CPC title