Method for preventing deposits in oil extraction

Details Method for preventing deposits in oil extraction Method for preventing deposits in oil extraction

E - Fixed Constructions

21

B

E21B 37/00 (2006.01) C09K 8/528 (2006.01) E21B 37/06 (2006.01)

Patent

CA 2334782

Carboxyl-containing fructans such as carboxymethylinulin can be successfully used to prevent deposition of scale composed of, for example, calcium, barium and strontium salts of sulphuric acid and carbonic acid in oil extraction, in that 0.5 - 200 ppm of a carboxyl-containing fructan that contains 0.3 - 3 carboxyl groups per mono- saccharide unit is incorporated in the process water, in the process equipment or in the oil-containing formation.

On peut utiliser avec succès des fructanes contenant du carboxyle tels que du carboxyméthylinuline pour empêcher le dépôt de tartre formé, par exemple, de sels de calcium, de baryum et de strontium d'acide sulfurique et d'acide carbonique, dans un processus d'extraction d'huile. Pour empêcher le tartre de se déposer, on incorpore dans l'eau de traitement, dans le matériel utilisé dans le processus ou dans la formation contenant de l'huile, entre 0,5 et 200 ppm d'un fructane qui contient entre 0,3 et 3 groupes carboxyle par unité monosaccharide.

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