Multi-phase metering device for oilfield applications
AssigneePERM Instruments Inc.
InventorsSerguei I. Krioutchkov, Apostolos Kantzas, Zheng Yin Wang
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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.
Claims17
A method of measuring the relative quantities of fast-relaxing and slow-relaxing components in a sample flow using nuclear magnetic resonance (NMR) relaxometry, comprising the steps of:
- flowing a sample comprising at least two components through the pipe, the at least two components comprising a fast-relaxing component and a slow-relaxing component;
- measuring a relaxation curve corresponding to at least one fast-relaxing component as the sample flows through the pipe, by applying an electromagnetic field to the sample and recording a signal response using an NMR coil;
- calculating, using a processor, a proportion of fast-relaxing component in the flowing sample based on relaxation spectra obtained from the measured relaxation curve;
- and
- calculating, using the processor, a proportion of a slow-relaxing component in the flowing sample based on the calculated proportion of fast-relaxing component;
- and
- enabling presentation of the calculated proportion of fast-relaxing and slow-relaxing components on a user interface.
An NMR apparatus for measuring the relative quantities of fast-relaxing and slow-relaxing components in a sample flow using nuclear magnetic resonance (NMR) relaxometry, the NMR apparatus comprising:
- a pipe configured to receive a flowing sample comprising at least two components, the at least two components comprising a fast-relaxing component and a slow-relaxing component;
- NMR components configured to measure a relaxation curve corresponding to at least one fast-relaxing component of the flowing sample;
- and
- a processor configured to calculate a proportion of fast-relaxing component in the flowing sample based on relaxation spectra obtained from the measured relaxation curve;
- and to calculate a proportion of a slow-relaxing component in the flowing sample based on the calculated proportion of fast-relaxing component.
A method of measuring the relative quantities of components in a fluid using nuclear magnetic resonance (NMR) relaxometry in an NMR pressure tube or pipe, comprising the steps of:
- calibrating the NMR pressure tube or pipe with a pure oil sample by putting a pure oil sample within the NMR pressure tube and applying an electromagnetic field to the sample and recording a signal response using the NMR coil thereby providing a pure-oil calibration curve;
- introducing at least a two-component mixture into the NMR pressure tube or pipe, wherein the mixture comprises oil and water;
- measuring relaxation curves of a hydrogen signal by applying an electromagnetic field to the mixture and recording a response using the NMR coil;
- calculating water-cut using a processor based on relaxation spectra obtained from the measured relaxation curves;
- and
- enabling presentation of the calculated water-cut on a user interface.
An NMR apparatus for measuring the relative quantities of components in a fluid, the NMR apparatus comprising a electronic circuit having a processor and a NMR pressure tube, the NMR apparatus being configured to:
- calibrate the NMR pressure tube or pipe with a pure oil sample;
- introduce at least a two-component mixture into the NMR pressure tube or pipe, wherein the mixture comprises oil and water;
- measure relaxation curves of a hydrogen signal;
- and
- calculate water-cut based on relaxation spectra obtained from the measured relaxation curves.
Dependencies are inferred from the claim text.