Water treatment in at least one membrane filtration unit for assisted recovery of hydrocarbons
AssigneeTotal SA
InventorsSamuel Heng, Pierre Pedenaud
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Abstract
A water treatment method is provided. The method includes filtering water in a membrane filtration unit including at least one membrane filtration module, collecting a permeate and collecting a retentate at the outlet of the membrane filtration module, withdrawing solid materials and/or hydrocarbons contained in the retentate, in order to provide a treated retentate, recycling the treated retentate at the inlet of the membrane filtration module, and providing a treated water flow from the permeate from membrane filtration module(s). An installation adapted for applying this method is also provided.
Claims19
A water treatment method, comprising the following successive steps:
- (i) filtering water in a membrane filtration unit comprising at least one membrane filtration module, the water containing hydrocarbons in an amount of up to 1000 ppm and suspended solid materials in an amount of up to 200 mg/L;
- (ii) collecting a permeate and collecting a retentate at an outlet of the membrane filtration module(s);
- (iii) withdrawing at least one of:
- (a) solid material and (b) hydrocarbons, contained in the retentate collected after step (ii) in order to provide a treated retentate;
- (iv) recycling the treated retentate at the inlet of the membrane filtration module(s);
- and
- (v) providing a treated water flow from the permeate of the membrane filtration module(s), the treated water flow comprising less than 10 ppm of hydrocarbons and less than 10 mg/L of suspended solid materials,
- wherein the membrane filtration unit includes inorganic membrane filters in ceramic based Al2O2, TiO2, ZrO2, SiO2, MgO, SiC or a mixture thereof, having a pore size ranging from 0.01 to 10 μm.
A method for producing hydrocarbons comprising:
- (i) filtering water with at least one membrane filtration module including an inlet and an outlet, the water containing hydrocarbons in an amount of up to 1000 ppm and suspended solid materials in an amount of up to 200 mg/L;
- (ii) collecting a permeate and collecting a retentate at the outlet of the at least one membrane filtration module;
- (iii) withdrawing at least one of:
- (a) solid material and (b) hydrocarbons, contained in the retentate collected after step (ii) in order to provide a treated retentate;
- (iv) recycling the treated retentate at the inlet of the at least one membrane filtration module;
- and
- (v) providing a treated water flow from the permeate of the at least one membrane filtration module, the treated water flow comprising less than 10 ppm of hydrocarbons and less than 10 mg/L of suspended solid materials;
- (vi) injecting the flow of treated and if necessary purified water into an underground formation containing hydrocarbons;
- and
- (vii) recovering a flow of the hydrocarbons from a production flow.
A water treatment installation, comprising:
- (a) a membrane filtration unit comprising:
- at least one membrane filtration module;
- a water admission line connected at the inlet of the membrane filtration module(s);
- a line for collecting permeate connected at the outlet of the membrane filtration module(s);
- a retentate collector connected at the outlet of the membrane filtration module(s);
- a separator operably separating at least one of:
- liquid/solid or water/hydrocarbons, the separator being fed only by the retentate collector;
- a line for recycling the treated retentate, connected at the outlet of the separator and feeding the water admission line;
- and
- (b) a line for collecting treated water from the membrane filtration unit,
- wherein the membrane filtration unit includes inorganic membrane filters in ceramic based Al2O2, TiO2, ZrO2, SiO2, MgO, SiC or a mixture thereof, having a pore size ranging from 0.01 to 10 μm.
Dependencies are inferred from the claim text.