E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/22 (2006.01) C09K 8/36 (2006.01) E21B 43/32 (2006.01)
Patent
CA 2285255
The present invention pertains to the extraction of petroleum products and more precisely relates to compositions and methods for preparing water-in-oil emulsions. These emulsions can be used for adjusting the injectivity profile of injection wells and/or for isolating the water inflow in oil wells. In order to increase the kinetic and aggregative stability of the water-in-oil emulsions thus produced, this method comprises using as an emulsifier raw and heavy crude oil which contains gumming-asphalt, which has a high porphyrin- complex content of at least 100 µg/g and which has not been submitted to any thermal-chemical treatment. The oily phase comprises a mixture of paraffin- based liquid hydrocarbons as well as a heavy solvent, wherein these components are selected in amounts by volume such that the (oily phase) mixture density is equal to that of the water used for preparing the water-in-oil emulsion.
Cette invention se rapporte au domaine de l'extraction des produits pétroliers et concerne plus précisément des compositions et des procédés qui permettent de préparer des émulsions de type eau-huile. Ces émulsions peuvent être utilisées afin d'ajuster le profil d'injectivité de puits d'injection et/ou d'isoler l'afflux d'eau dans des puits de pétrole. Afin d'accroître la stabilité cinétique et agrégative des émulsions eau-huile ainsi formées, on utilise en qualité d'émulsifiant du pétrole brut, lourd et à base d'asphalte gommant, qui possède un contenu élevé d'au moins 100 µg/g de complexes de porphyrine et qui n'a été soumis à aucun traitement thermochimique. On utilise en qualité de phase huileuse un mélange d'hydrocarbures liquides à base de paraffine ainsi qu'un solvant lourd, ceci dans des proportions en volume telles que la densité du mélange (de la phase huileuse) soit égale à la densité de l'eau servant à préparer l'émulsion de type eau-huile.
Dosov Alexander Nikolaevich
Manyrin Vyacheslav Nikolaevich
Pozdnyshev Gennady Nikolaevich
Savelyev Alexander Georgievich
Dosov Alexander Nikolaevich
Manyrin Vyacheslav Nikolaevich
Pozdnyshev Gennady Nikolaevich
Savelyev Alexander Georgievich
Thompson Lambert Llp
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