Production of heavy hydrocarbons by in-situ hydrovisbreaking

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/24 (2006.01) E21B 36/02 (2006.01) E21B 43/243 (2006.01) E21B 43/40 (2006.01)

Patent

CA 2335771

An integrated process is disclosed for treating, at the surface, production fluids recovered from the application of in situ hydrovisbreaking to heavy crude oils and natural bitumens deposited in subsurface formations. The production fluids are comprised of virgin heavy hydrocarbons, heavy hydrocarbons converted via the hydrovisbreaking process to lighter liquid hydrocarbons, residual reducing gases, hydrocarbon gases, and other components. In the process of this invention, the hydrocarbons in the production fluids are separated into a synthetic-crude-oil product (a nominal butane to 975 °F fraction with reduced sulfur, nitrogen, metals, and carbon residue) and a residuum stream (a nominal 975 °F + fraction). Partial oxidation of the residuum is carried out to produce clean reducing gas and fuel gas for steam generation, with the reducing gas and steam used in the in situ hydrovisbreaking process.

L'invention concerne un procédé intégré servant à traiter, en surface, des fluides de production récupérés depuis l'application d'une technique exécutée in situ et consistant à casser la viscosité d'huiles brutes lourdes et de bitumes naturels déposés dans des formations souterraines. Ces fluides de production sont composés d'hydrocarbures lourds vierges, d'hydrocarbures lourds convertis au moyen de ce procédé de cassure de viscosité en hydrocarbures liquides plus légers, de gaz de réduction résiduels, d'hydrocarbures gazeux et d'autres constituants. Ce procédé consiste à séparer les hydrocarbures contenus dans les fluides de production en un produit d'huile brute synthétique (butane nominal + fraction à 975 DEG F à teneur réduite en soufre, azote, métaux et carbone résiduel) et un flux de résiduum (975 DEG F nominal + fraction). On effectue l'oxydation partielle du résiduum afin d'obtenir un gaz de réduction propre et un combustible gazeux de génération de vapeur, ce gaz de réduction et cette vapeur étant mis en application dans la technique de cassure de la viscosité des hydrocarbures.

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