Method for adjusting the level of inhibitors in an oil or gas well
AssigneesTotal SA, Universite Lyon 1, Centre National de la Recherche Scientifique (CNRS)
InventorsChristian Hurtevent, Salima Baraka-Lokmane, John-Richard Ordonez-Varela, Olivier Tillement, Thomas Brichart, Matteo Martini
Life of this patent
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Abstract
A method for adjusting, to a pre-determined value, the level of a mineral deposition or corrosion inhibitor injected into a gas or oil well. Using of the time-resolved fluorescence method for detecting and quantifying a mineral deposition or corrosion inhibitor in a fluid from an oil or gas production well.
Claims6
A method for adjusting to a predetermined value an amount of a mineral deposition inhibitor and a corrosion inhibitor injected into a gas or oil well, comprising the following successive steps:
- tagging the mineral deposition inhibitor and the corrosion inhibitor with a lanthanide, said tagging being carried out by (i) grafting, on the skeleton of each of the mineral deposition inhibitor and the corrosion inhibitor, a molecule complexing the lanthanide, or (ii) via complexation of the lanthanide with the mineral deposition inhibitor and the corrosion inhibitor;
- extracting a fluid from a production well;
- detecting and quantifying the tagged mineral deposition inhibitor and the tagged corrosion inhibitor, via time-resolved fluorescence, in the fluid extracted from the production well;
- and
- if the amount of the tagged mineral deposition inhibitor or the tagged corrosion inhibitor does not meet the predetermined value, injecting into the well an additional quantity of the inhibitor to reach said predetermined value,
- wherein the mineral deposition inhibitor is selected from the group consisting of polyphosphates, organophosphonates, carboxylic polyacides, polymers with a sulphonic acid function, polyphosphinocarboxylic acid (PPCA), sulphonated polyphosphinocarboxylic acid (PPCA), polyethyleneimine, silicone polymers functionalised by amine groups, and copolymers made from quaternary ammonium, and
- wherein the corrosion inhibitor is selected from the group consisting of cyclohexylamine, hexylamine, morpholine, octadecylamine, diethylaminoethanol and betaines.
Dependencies are inferred from the claim text.