METHOD FOR TREATING A PRODUCTION EFFLUENT FROM AN ENHANCED OIL RECOVERY PROCESS BY MEANS OF A DEMULSIFYING FORMULATION BASED ON CATIONIC MODIFIED GUAR GUM

• Main Authors: ARGILLIER, Jean-Francois, MOURET, Aurélie, KLOPFFER, Marie-Hélène, TAY, Astrid, SALAÜN, Mathieu
• Format: Patent
• Language: English; French
• Published: 19.05.2022
• Subjects: ADHESIVES; CHEMISTRY; CRACKING HYDROCARBON OILS; DYES; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; FUELS; LUBRICANTS; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MINERAL WAXES; MINING; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PAINTS; PEAT; PERFORMING OPERATIONS; PETROLEUM, GAS OR COKE INDUSTRIES; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; POLISHES; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVEHYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, ORGASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; SEPARATION; TECHNICAL GASES CONTAINING CARBON MONOXIDE; TRANSPORTING

The present invention relates to a method for treating a production effluent from an enhanced oil recovery process using at least one surfactant, the effluent being in the form of an oil-in-water emulsion comprising, in percentage by volume, at least 20% of oil phase dispersed in an aqueous phase, wherein the production effluent is brought into contact with a demulsifying formulation comprising a cationic modified guar gum and the oil phase is separated from the aqueous phase. The invention likewise relates to a method for enhanced recovery of crude oil present in a geological reservoir, wherein the obtained production effluent is treated by means of the treatment method. La présente invention concerne un procédé de traitement d'un effluent de production issu d'un procédé de récupération assistée du pétrole mettant en œuvre au moins un tensio-actif, ledit effluent étant sous forme d'une émulsion huile dans eau comprenant au moins 20% volume de phase huile dispersée dans une phase aqueuse, dans lequel on met en contact ledit effluent de production avec une formulation désémulsifiante comprenant une gomme guar modifiée cationique et on sépare la phase huile de la phase aqueuse. L'invention concerne également un procédé de récupération assistée de pétrole brut contenu dans un réservoir géologique dans lequel on traite l'effluent de production obtenu au moyen dudit procédé de traitement.