Dual integrated PSA for simultaneous power plant emission control and enhanced hydrocarbon recovery

Patent metadata

Field	Value
Publication number	US-10125641-B2
Application number	US-201615339987-A
Country	US
Kind code	B2
Filing date	Nov 1, 2016
Priority date	Nov 17, 2015
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

Systems and methods are provided for combined cycle power generation and enhanced hydrocarbon production where emission gases during power generation are separated by adsorption and applied to facilitate extraction of hydrocarbons from a reservoir. A power generation plant passes exhaust gas to a first swing adsorption reactor. The first swing adsorption reactor adsorbs the CO 2 from the exhaust gas. An adsorption cycle of the first swing adsorption reactor is variable. An injection well injects the CO 2 adsorbed by the first swing adsorption reactor in a hydrocarbon reservoir. A production well that is in communication with the injection well produces a mixture of hydrocarbons and CO 2 . A second swing adsorption reactor purifies the produced hydrocarbons by adsorbing the produced CO 2 from the production well.

First claim

The invention claimed is:

1. A method, comprising:
passing exhaust gas from a power generation plant to a first swing adsorption reactor, wherein the exhaust gas includes CO 2 and N 2 ;
adsorbing the CO 2 from the exhaust gas on a first adsorbent material of the first swing adsorption reactor, wherein an adsorption cycle of the first swing adsorption reactor is variable;
injecting the CO 2 adsorbed by the first swing adsorption reactor, along with CH 4 from a production well, in a hydrocarbon reservoir by using an injection well;
producing a mixture of hydrocarbons, including at least CH 4 , and CO 2 by using the production well, which is in communication with the injection well; and
purifying the mixture of hydrocarbons, which includes at least a mixture of CH 4 and CO 2 by adsorbing the CO 2 mixed with the mixture of hydrocarbons on a second adsorbent material of a second swing adsorption reactor, wherein a mixture of CO 2 adsorbed by the second swing adsorption reactor, steam, and CH 4 from the production well are used to purge the first swing adsorption reactor, and an amount of steam used in the purge of the first swing adsorption reactor increases as an amount of CO 2 used to produce the mixture hydrocarbons increases.

2. The method of claim 1 , wherein a N 2 stream unadsorbed by the first swing adsorption reactor exits the first swing adsorption reactor at a pressure that is substantially the same as a pressure of the exhaust gas from the power generation plant.

3. The method of claim 1 , further comprising:
recovering a N2 stream unadsorbed by the first swing adsorption reactor.

4. The method of claim 1 , further comprising:
purging the second swing adsorption reactor with a stream of N 2 unadsorbed by the first swing adsorption reactor.

5. The method of claim 1 , further comprising:
feeding at least a portion of the purified hydrocarbons back into the power generation plant and generating power.

6. The method of claim 1 , further comprising:
varying the adsorption cycle of the first swing adsorption reactor to adjust composition of adsorbed CO 2 based on a composition of hydrocarbons in the hydrocarbon reservoir.

7. The method of claim 6 , wherein the composition of the hydrocarbons in the hydrocarbon reservoir varies with age of the reservoir.

8. The method of claim 1 , wherein at least one of the first swing adsorption reactor and the second swing adsorption reactor is a high-temperature reactor.

9. The method of claim 1 , further comprising:
purging the second swing adsorption reactor with at least one of a stream of CO 2 and a stream of CH 4 flowing from the production well.

10. A system, comprising:
a power generation plant that produces exhaust gas, wherein the exhaust gas includes CO 2 and N2;
a first swing adsorption reactor, wherein the power generation plant passes the exhaust gas to the first swing adsorption reactor, wherein the first swing adsorption reactor adsorbs the CO 2 from the exhaust gas on a first adsorbent material of the first swing adsorption reactor, and wherein an adsorption cycle of the first swing adsorption reactor is variable;
an injection well that injects the CO2 adsorbed by the first swing adsorption reactor along with CH 4 from a production well, in a hydrocarbon reservoir;
the production well that is in communication with the injection well and that produces a mixture of hydrocarbons, including at least CH4, and CO 2 ; and
a second swing adsorption reactor that purifies the mixture of hydrocarbons, which includes at least a mixture of CH 4 and CO 2 , from the production well by adsorbing the CO 2 mixed with the mixture of hydrocarbons on a second adsorbent material of the second swing adsorption reactor, wherein a mixture of CO 2 adsorbed by the second swing adsorption reactor, steam, and CH 4 from the production well are used to purge the first swing adsorption reactor, and an amount of steam used in the purge of the first swing adsorption reactor increases as an amount of CO 2 used to produce the mixture hydrocarbons increases.

11. The system of claim 10 , wherein the adsorption cycle of the first swing adsorption reactor is varied to adjust composition of adsorbed CO 2 based on a composition of hydrocarbons in the hydrocarbon reservoir.

12. The system of claim 10 , wherein at least a portion of the purified hydrocarbons are fed back into the power generation plant to generate power.

Assignees

• Exxonmobil Res & Eng Co

Inventors

• Sundaram Narasimhan
• Thomann Hans
• Mittricker Franklin F
• STARCHER Loren

Classifications

• B01D2256/10

  Nitrogen · CPC title

• C10L3/104

  Carbon dioxide · CPC title

• F01K7/16

  the engines being only of turbine type (the engines using steam of critical or overcritical pressure F01K7/32; the engines being of extraction or non-condensing type F01K7/34) · CPC title

• F01K23/10 Primary

  with exhaust fluid of one cycle heating the fluid in another cycle (F01K17/025 takes precedence) · CPC title

• E21B43/164

  Injecting CO2 or carbonated water (in combination with organic material C09K8/594) · CPC title