Patent ID: 9562422
Date: 2017-02-07
CPC Classifications: E21B

Claim:
1. A system for treating a subterranean hydrocarbon containing formation, comprising: a wellbore in the subterranean hydrocarbon containing formation; a central tubing along a length of the wellbore, wherein the central tubing is configured to provide an injection fluid into the wellbore; an annulus between the central tubing and outer walls of the wellbore, wherein the annulus is configured to remove formation fluids from the wellbore; a first packer positioned in an injection or production section of the wellbore, wherein the first packer defines a first wellbore interval after the first packer, wherein the central tubing before the first packer is in fluid communication with the annulus in the first wellbore interval after the first packer, and wherein the annulus before the first packer is in fluid communication with the central tubing in the first wellbore interval after the first packer; a second packer positioned in an injection or production section of the wellbore after the first packer and in fluid communication with the first wellbore interval, wherein the second packer defines a second wellbore interval after the second packer, wherein the central tubing before the second packer is in fluid communication with the annulus in the second wellbore interval after the second packer, and wherein the annulus before the second packer is in fluid communication with the central tubing in the second wellbore interval after the second packer; and a third packer positioned in an injection or production section of the wellbore after the second packer and in fluid communication with the second wellbore interval, wherein the third packer defines a third wellbore interval after the third packer, wherein the central tubing before the third packer is in fluid communication with the annulus in the third wellbore interval after the third packer, and wherein the annulus before the third packer is in fluid communication with the central tubing in the third wellbore interval after the third packer; wherein the annulus in the first wellbore interval is configured to provide the injection fluid into the hydrocarbon containing formation to mobilize formation fluids in the hydrocarbon containing formation, wherein the annulus in the second wellbore interval is configured to allow mobilized formation fluids to enter the wellbore from the hydrocarbon containing formation, and wherein the annulus in the third wellbore interval is configured to provide the injection fluid into the hydrocarbon containing formation to mobilize formation fluids in the hydrocarbon containing formation.