US 2022/0187490 A1 · ELECTRON PARAMAGNETIC RESONANCE (EPR) TECHNIQUES AND APPARATUS FOR PERFORMING EPR SPECTROSCOPY ON A FLOWING FLUID

Abstract

Certain aspects of the present disclosure provide methods and apparatus for performing electron paramagnetic resonance (EPR) spectroscopy on a fluid from a flowing well, such as fluid from hydrocarbon recovery operations flowing in a downhole tubular, wellhead, or pipeline. One example method generally includes, for a first EPR iteration, performing a first frequency sweep of discrete electromagnetic frequencies on a cavity containing the fluid; determining first parameter values of reflected signals from the first frequency sweep; selecting a first discrete frequency corresponding to one of the first parameter values that is less than a threshold value; activating a first electromagnetic field in the fluid at the first discrete frequency; and while the first electromagnetic field is activated, performing a first DC magnetic field sweep to generate a first EPR spectrum.

Claims18

Dependent claims

(canceled)

A method of determining one or more properties of a fluid containing suspended particles, the fluid having a fluid temperature that is not constant, the method comprising:

(a) conveying a sample of the fluid and the suspended particles into a cavity;
(b) measuring a fluid temperature or a cavity temperature;
(c) transmitting microwave energy into the cavity at a plurality of transmitted frequencies;
(d) measuring microwave energy reflected from the cavity at each transmitted frequency;
(e) deriving a parameter based on the measurement of microwave energy reflected from the cavity at each transmitted frequency;
(f) discharging the sample from the cavity;
(g) repeating operations (a)-(f) at a plurality of fluid temperatures to create a correspondence between the derived parameter and the measured fluid temperature or the measured cavity temperature;
and
(h) determining one or more properties of the fluid or the suspended particles based on that correspondence.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/531,855Filed 22 Nov 2021

Priority

19 Jan 2017

Published

16 Jun 2022

Term ends

Not estimatedThe source records don’t support an estimate.

Classification15 codes

G01V 3/14
Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation: operating with…
E21B 49/08
Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to…:…
G01N 24/10
Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects: by using…
G01R 33/343
Constructional details, e.g. resonators , specially adapted to MR: of slotted-tube or loop-gap type

Family

Application62/448,095Us provisional application · filed 19 Jan 2017

Application15/875,823Continuation · filed 19 Jan 2018

Application16/738,600Continuation · filed 9 Jan 2020

Application17/531,855Continuation

US 10,564,308 B1Related patent

US 11,181,658 B2Related patent

US 11,828,899 B2Related patent

US 2020/0225378 A1Published application

US 2022/0187490 A1This patent

From the US filing history. Foreign family members aren’t listed.

Electron paramagnetic resonance (epr) techniques and apparatus for performing epr spectroscopy on a flowing fluid

Life of this patent

Electron paramagnetic resonance (epr) techniques and apparatus for performing epr spectroscopy on a flowing fluid

Life of this patent

Abstract

Claims18