In situ treatment system and method for wellbore chemical sensors
Systems and methods for a treatment of chemical sensors placed in a wellbore. A method may comprise providing a chemical sensor disposed in a sensing chamber, wherein the chemical sensor is on an optical fiber installed in a wellbore; optically interrogating the chemical sensor with the optical fiber; and pumping a treatment fluid through a fluid supply line and into the sensing chamber.
1 . A sensing system comprising:
a conduit assembly to be disposed in a wellbore;
one or more sensing chambers disposed within an interior cavity of the conduit assembly;
one or more chemical sensors disposed in the one or more sensing chambers, wherein each of the one or more sensing chambers are fluidically connected to a fluid supply line;
two or more seals to isolate the one or more sensing chambers from the interior cavity and to isolate the conduit assembly from the fluid supply line, wherein the fluid supply line is a different channel than the interior cavity of the conduit assembly; and
a treatment fluid disposed within the fluid supply line and configured to clean, replenish, calibrate, and/or refresh the one or more chemical sensors.
2 . The sensing system of claim 1 , further comprising one or more apertures disposed within each sensing chamber that allow downhole fluids to circulate through the sensing chamber.
3 . The sensing system of claim 2 , further comprising one or more check valves disposed in the one or more apertures.
4 . The sensing system of claim 2 , further comprising one or more ball check valves disposed in the one or more apertures.
5 . The sensing system of claim 2 , further comprising one or more flapper check valves disposed in the one or more apertures.
6 . The sensing system of claim 1 , wherein the one or more sensing chambers are fluidically connected to the fluid supply through one or more fluid inlets.
7 . The sensing system of claim 6 , wherein a treatment fluid is disposed within the fluid supply line.
8 . The sensing system of claim 1 , wherein the two or more seals include fiber seals or hermetic fiber seals.
9 . The sensing system of claim 1 , wherein the treatment fluid may comprise a rejuvenation agent.
10 . A method comprising:
disposing a conduit assembly into a wellbore, wherein the conduit assembly comprises:
a sensing chamber disposed within interior cavity of the conduit assembly;
a chemical sensor disposed in the sensing chamber;
a fluid supply line connected to the sensing chamber through a fluid inlet; and
two or more seals to isolate the sensing chamber from the interior cavity and to isolate the conduit assembly from the fluid supply line:
moving a treatment fluid into the sensing chamber through the fluid supply line; and
cleaning, replenishing, calibrating, and/or refreshing the chemical sensor with the treatment fluid, wherein the fluid supply line is a different channel than the interior cavity of the conduit assembly.
11 . The method of claim 10 , wherein the sensing chamber further comprises one or more apertures that allow downhole fluids to circulate through the sensing chamber.
12 . The method of claim 11 , further comprising one or more check valves disposed in the one or more apertures.
13 . The method of claim 11 , further comprising one or more ball check valves disposed in the one or more apertures.
14 . The method of claim 11 , further comprising one or more flapper check valves disposed in the one or more apertures.
15 . The method of claim 10 , wherein the conduit assembly further comprises a plurality of sensing chambers formed in at least a part of the conduit assembly.
16 . The method of claim 10 , wherein the treatment fluid comprises fresh water, a pH buffer solution, or any combination thereof.
17 . The method of claim 10 , wherein the treatment fluid comprises a hydrocarbon solvent, ethylene, acid, surfactants in a water-based solution or any combination thereof.
18 . The method of claim 10 , further comprising returning the treatment fluid to surface.
19 . The method of claim 10 , further comprising discharging the treatment fluid into the wellbore.
20 . The method of claim 10 , wherein the conduit assembly comprises further comprises three or more seals configured to separate two or more sensing chambers.