Multi-Phase Metering Device for Oilfield Applications

• US 20120092008A1
• Filed: 07/27/2011
• Published: 04/19/2012
• Est. Priority Date: 10/13/2010
• Status: Active Grant

• Current Assignee: PERM Inc.
• Original Assignee: Perm Instruments Inc.
• Inventors: Krioutchkov, Serguei I., Kantzas, Apostolos, Wang, Zhengyin
• Granted Patent: US 8,659,293 B2
• Time in Patent Office: Days
• US Class Current: 324/307
• CPC Class Codes: G01N 24/081 Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity
• CPC Class Codes: G01N 24/082 Measurement of solid, liquid or gas content
• CPC Class Codes: G01R 33/34053 Solenoid coils; Toroidal coils

Abstract

This application is related to a system and methods for sampling fluids and gases using nuclear magnetic resonance (NMR) technology. Specifically the system is related to an improved metallic pipe design for use at oil and gas well heads that includes integral coils for transmitting an NMR pulse sequence and detecting NMR signals and can be used as a component of an NMR instrument. The methods are related to obtaining and analyzing NMR spectra in stationary and flowing states.

Claims

1. A pipe system for enabling nuclear magnetic resonance (NMR) analysis of gas and liquids within the pipe system comprising:

an inner layer defining an internal volume within the pipe;

an insulating layer in operative contact with the inner layer, the insulating layer containing and supporting an NMR resonator coil;

a shielding layer in operative contact with the insulating layer; and

an outer non-magnetic layer in operative contact with the shielding layer for operatively containing pressurized fluids within the inner layer.

2. The pipe system as in claim 1 wherein the outer non-magnetic layer is selected from any one of or a combination of titanium, stainless steel, beryllium, and copper.

3. The pipe system as in claim 1 wherein the ratio of the diameter of the NMR resonator coil and the diameter of the shielding layer (D_R/D_SL) is between 0.3 and 0.7.

4. The pipe system as in claim 1 wherein the shielding layer is selected from any one of or a combination of silver, copper, titanium and a superconductor.

5. The pipe system as in claim 1 wherein the insulating layer is a resin.

21. A nuclear magnetic resonance system comprising:

a low field (1-5 MHz) permanent magnet operatively configured to a pipe system as described in claim 1;

a pulse signal creation circuit operatively connected to the resonator coil for generating radiofrequency (RF) pulsations to the resonator coil;

a RF receiver circuit for receiving and filtering RF data from the pipe system for delivery to a data acquisition system;

a transceiver switch circuit operatively connected to the pulse signal creation circuit and RF receiver circuit for operative switching between a signal creation and a signal listening mode; and

an explosion proof container for operative containment of the magnet, pulse signal creation circuit, RF receiver circuit and transceiver switch circuit.

22. A system as in claim 21 further comprising an air purge cooling system for maintaining a positive pressure within the explosion proof container.

6. A pipe system for enabling nuclear magnetic resonance (NMR) analysis of gas and liquids within the pipe system comprising:

an inner layer defining an internal volume within the pipe;

a thermoplastic insulating layer in operative contact with the inner layer, the insulating layer containing and supporting an NMR resonator coil;

a shielding layer selected from any one or a combination of silver, copper, titanium and a superconductor, in operative contact with the thermoplastic insulating layer; and

an outer non-magnetic layer selected from any one of or a combination of titanium, stainless steel, beryllium and copper, in operative contact with the shielding layer for operatively containing pressurized fluids within the inner layer.

7. The pipe system as in claim 6 wherein the outer non-magnetic layer is titanium.

8. The pipe system as in claim 6 wherein the shielding layer is copper.

9. The pipe system as in claim 6 wherein the ratio of the diameter of the NMR resonator coil and the diameter of the shielding layer (D_R/D_SL) is 0.5-0.6.

10. The pipe system as in claim 6 wherein the shielding layer is titanium.

11. The pipe system as in claim 6 wherein the ratio of the diameter of the NMR resonator coil and the diameter of the shielding layer (D_R/D_SL) is 0.3-0.4.

12. The pipe system as in claim 6 wherein the thermoplastic insulating layer is polyetheretherketone (PEEK).

13. The pipe system as in claim 6 wherein the resonator coil is copper.

14. The pipe system as in claim 6 wherein the resonator coil is the same material as the shielding layer.

15. The pipe system as in claim 6 wherein the insulating layer has a higher conductivity than the resonator coil.

16. The pipe system as in claim 6 wherein the inner layer is polyetheretherketone (PEEK).

17. The pipe system as in claim 6 wherein the inner layer is polytetrafluoroethylene.

18. The pipe system as in claim 6 wherein the length of the resonator coil along the pipe is greater than twice the diameter of the resonator coil.

19. The pipe system as in claim 6 wherein the resonator coil comprises a plurality of coils connected in parallel.

20. A pipe system for enabling nuclear magnetic resonance (NMR) analysis of gas and liquids within the pipe system comprising:

an inner layer composed of polyetheretherketone (PEEK) defining an internal volume within the pipe;

a thermoplastic insulating layer made of polyetheretherketone (PEEK) in operative contact with the inner layer, the insulating layer containing and supporting an NMR resonator coil made of copper;

a shielding layer made of titanium, in operative contact with the insulating layer; and

an outer non-magnetic layer made from titanium in operative contact with the shielding layer for operatively containing pressurized fluids within the inner layer.

23. A method of measuring the relative quantity of a gas or liquid in a high temperature and pressure fluid using nuclear magnetic resonance (NMR) relaxometry in an NMR pressure tube, comprising the steps of:

a) calibrating the NMR pressure tube with a pure water sample;

b) calibrating the NMR pressure tube with a pure oil sample;

c) repeating steps a) and b) over a selected temperature range;

d) introducing at least a two-component mixture into the NMR pressure tube;

e) measuring relaxation curves of a hydrogen signal; and

f) calculating water-cut based on relaxation spectra obtained from relaxation curves of step e).

24. A method as in claim 23 wherein the two-component mixture is stationary.

25. A method as in claim 23 wherein the two-component mixture is flowing within the NMR pressure tube.