Heavy oil and bitumen upgrading
View Patent ↗Disclosed is a process for the upgrading and demetallizing of heavy oils and bitumens. A crude heavy oil and/or bitumen feed is supplied to a solvent extraction process 104 wherein DAO and asphaltenes are separated. The DAO is supplied to an FCC unit 106 having a low conversion activity catalyst for the removal of metals contained therein. The demetallized distillate fraction is supplied to a hydrotreater 110 for upgrading and collected as a synthetic crude product stream. The asphaltene fraction can be supplied to a gasifier 108 for the recovery of power, steam and hydrogen, which can be supplied to the hydrotreater 110 or otherwise within the process or exported. An optional coker 234 can be used to convert excess asphaltenes and/or decant oil to naphtha, distillate and gas oil, which can be supplied to the hydrotreater 220.
1. A process for upgrading crude oil from a subterranean reservoir of heavy oil or bitumen, comprising:
converting asphaltenes to steam, power, fuel gas, or a combination thereof for use in producing heavy oil or bitumen from a reservoir;
solvent deasphalting at least a portion of the heavy oil or bitumen to form an asphaltene fraction and a deasphalted oil (DAO) fraction essentially free of asphaltenes having a reduced metals content;
supplying the asphaltenes fraction from the solvent deasphalting to the asphaltenes conversion;
supplying a feed comprising the DAO fraction to a reaction zone of a fluid catalytic cracking (FCC) unit with FCC catalyst to deposit a portion of the metals from the DAO fraction onto the FCC catalyst, wherein lower boiling hydrocarbon fractions are introduced to the FCC unit with the DAO fraction;
recovering a hydrocarbon effluent having a reduced metal content from the FCC unit; and
removing metallized FCC catalyst from the FCC unit.
2. The process of claim 1 , further comprising producing heavy oil or bitumen by extraction from mined tar sands.
3. The process of claim 1 further comprising producing heavy oil or bitumen by injecting a mobilizing fluid through one or more injection wells completed in communication with the reservoir to mobilize the heavy oil or bitumen and producing the mobilized heavy oil or bitumen from at least one production well completed in communication with the reservoir.
4. The process of claim 3 wherein the mobilizing fluid comprises steam generated primarily by combustion of asphaltenes recovered from the asphaltenes fraction from the solvent deasphalting.
5. The process of claim 2 , wherein the asphaltenes conversion comprises gasification of a portion of the asphaltenes fraction to provide power, steam, fuel gas or combinations thereof for the mining and extraction.
6. The process of claim 1 wherein the solvent deasphalting has a high lift.
7. The process of claim 1 further comprising feeding a portion of the asphaltenes fraction to a delayed coker unit to produce coker liquids and coke.
8. The process of claim 1 wherein the FCC unit is operated at a conversion from 30 to 65 percent by volume of the feed to the FCC unit.
9. The process of claim 1 wherein operating conditions in the FCC unit are adjusted to control proportions of naphtha, distillate and gas oil in the hydrocarbon effluent from the FCC unit.
10. The process of claim 1 further comprising hydrotreating the hydrocarbon effluent from the FCC unit to produce a low sulfur hydrocarbon effluent.
11. The process of claim 10 wherein the hydrotreating is effected at a moderate pressure of from 3.5 to 10 MPa.
12. The process of claim 10 further comprising gasifying asphaltenes recovered in the asphaltenes fraction from the solvent deasphalting to produce hydrogen for the hydrotreating.