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US 11,993,747 B1Granted
Treatment of subterranean formations
AssigneeSaudi Arabian Oil Company
InventorsZuhair Al-Yousif, Abdulaziz S. Al-Qasim, Shaohua Chen, Tianping Huang, Ming Han
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Abstract
The present disclosure relates to methods for treating a water zone of a subterranean formation by injecting a mixture including an anionic surfactant and an amine, followed by CO2, to reduce water production from the formation.
Claims25
A method of treating a water zone of a subterranean formation, the method comprising:
- injecting, through a wellbore into the water zone, a mixture comprising an anionic surfactant and an amine and having a viscosity of less than about 0.01 Pa·s at a shear rate from about 0.1 to about 1000 s−1;
- and then
- injecting CO2 through the wellbore into the water zone to increase a viscosity of the mixture in the water zone,
- wherein increasing the viscosity of the mixture reduces an influx of water from the water zone into the wellbore, and
- wherein the anionic surfactant comprises a compound of Formula I, Formula II, or Formula III:
- wherein:
- R1 is
- the sum of m and q is an integer from 12 to 22;
- n is an integer from 0 to 10;
- p is 0 or 1;
- and
- X+ is Li+, Na+, K+, Cs+, Ag+, or (RA)4N+, wherein
- each occurrence of R A is selected from H, C1-6 alkyl, C3-6 cycloalkyl, 4- to 7-membered heterocycloalkyl, C6-10 aryl, and 5- to 10-membered heteroaryl;
- each C1-6 alkyl is optionally substituted with 1-3 RB independently selected from C3-6 cycloalkyl, 4- to 7-membered heterocycloalkyl, C6-10 aryl, and 5- to 10-membered heteroaryl;
- and
- optionally, one or more instances of R A are taken together with the nitrogen atom to which they are attached to form a 4- to 7-membered heterocycloalkyl.
13 more elements
A method of treating a water zone of a subterranean formation, the method comprising:
- deploying a straddle packer into a wellbore in the subterranean formation;
- expanding an upper seal of the straddle packer above the water zone and expanding a lower seal of the straddle packer below the water zone to mechanically isolate the water zone;
- injecting a mixture comprising an anionic surfactant and an amine through the straddle packer into the water zone;
- and then
- injecting CO2 through the wellbore into the water zone to increase a viscosity of the mixture in the water zone,
- wherein the anionic surfactant comprises a compound of Formula I, Formula II, or Formula III:
- wherein:
- R1 is
- the sum of m and q is an integer from 12 to 22;
- n is an integer from 0 to 10;
- p is 0 or 1;
- and
- X+ is Li+, Na+, K+, Cs+, Ag+, or (RA)4N+, wherein
- each occurrence of R A is selected from H, C1-6 alkyl, C3-6 cycloalkyl, 4- to 7-membered heterocycloalkyl, C6-10 aryl, and 5- to 10-membered heteroaryl;
- each C1-6 alkyl is optionally substituted with 1-3 RB independently selected from C3-6 cycloalkyl, 4- to 7-membered heterocycloalkyl, C6-10 aryl, and 5- to 10-membered heteroaryl;
- and
- optionally, one or more instances of R A are taken together with the nitrogen atom to which they are attached to form a 4- to 7-membered heterocycloalkyl.
14 more elements
Dependencies are inferred from the claim text.