Apparatus, method and system for detecting salt in a hydrocarbon fluid

Patent metadata

Field	Value
Publication number	US-9513273-B2
Application number	US-201514982972-A
Country	US
Kind code	B2
Filing date	Dec 29, 2015
Priority date	Jul 13, 2012
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

A method for determining a salt concentration of a hydrocarbon fluid using a conductivity sensor and a hydrocarbon testing solution includes forming the hydrocarbon testing solution. The electropolymerizable monomer is operable to form a resultant associated polymer at a peak potential of the electropolymerizable polymer. The method includes introducing the hydrocarbon testing solution into the conductivity sensor. The method includes inducing a range of potential across the hydrocarbon testing solution such that at least a portion of the electropolymerizable monomer polymerizes. The range of induced potential includes the peak potential of the electropolymerizable polymer. The method includes detecting a range of electrical current associated with the range of potential induced. The method also includes the step of determining the salt concentration of the hydrocarbon fluid using the range of potential induced and the range of electrical current detected.

First claim

What is claimed is:

1. A method for determining a salt concentration of a hydrocarbon fluid using a conductivity sensor and a hydrocarbon testing solution, the method comprising the steps of:
introducing the hydrocarbon testing solution into the conductivity sensor, where the conductivity sensor comprises a working electrode, a counter electrode and a reference electrode, where the hydrocarbon testing solution comprises the hydrocarbon fluid, an electropolymerizable monomer and a non-aqueous solvent;
inducing a range of potential across the hydrocarbon testing solution contained in the conductivity sensor, such that the hydrocarbon testing solution forms an exhausted hydrocarbon testing solution;
detecting a range of electrical current associated with the range of potential induced using the conductivity sensor; and
determining the salt concentration of the hydrocarbon fluid using the range of potential induced across the hydrocarbon testing solution and the range of electrical current detected by the conductivity sensor.

2. The method of claim 1 , comprising forming the hydrocarbon testing solution, where the hydrocarbon testing solution comprises the hydrocarbon fluid, an electropolymerizable monomer and a non-aqueous solvent, where the hydrocarbon fluid includes a salt, and where the electropolymerizable monomer is operable in the hydrocarbon testing solution to form a resultant associated polymer at the peak potential of the electropolymerizable polymer.

3. The method of claim 2 further comprising the step of introducing a non-aqueous solvent of the resultant associated polymer into the conductivity sensor.

4. The method of claim 2 where the range of induced potential includes the peak potential of the electropolymerizable polymer.

5. The method of claim 2 further comprising the step of passing the exhausted hydrocarbon testing solution from the conductivity sensor.

6. The method of claim 5 where the non-aqueous solvent of the resultant associated polymer is introduced into the conductivity sensor such that the exhausted hydrocarbon testing solution present in the conductivity sensor passes from the conductivity sensor.

7. The method of claim 1 where the range of detected electrical current includes the peak current.

8. The method of claim 1 where the range of potential is induced at a linear sweep rate and where the linear sweep rate is in a range of from about 5 millivolts per second (mV/sec) to about 0.5 volts per second.

9. The method of claim 3 where the linear sweep rate is about 20 mV/sec.

Assignees

• Saudi Arabian Oil Co

Inventors

• Akmal Naim
• Aleisa Rashed Mohammad
• Vaidya Milind M

Classifications

• C10G31/08 Primary

  by treating with water · CPC title

• G01N27/413 Primary

  Concentration cells using liquid electrolytes {measuring currents or voltages in voltaic cells} · CPC title

• G01N27/26 Primary

  by investigating electrochemical variables; by using electrolysis or electrophoresis · CPC title

• G01N27/4166

  measuring a particular property of an electrolyte · CPC title

• G01N27/301

  Reference electrodes · CPC title