Functional polymer for enhanced oil recovery
View Patent ↗The present invention relates compositions and methods for enhanced oil recovery. The method is directed to employing a water-soluble The present invention relates compositions and methods for enhanced oil recovery (EOR). The method is directed to employing a water-soluble functional polymeric surfactant (FPS), with a medium IFT value, preferably ranged from about 0.1 to about 15 dyne/cm between water phase containing polymeric surfactant and hydrocarbon phase, for recovery of hydrocarbons from subterranean formations. The FPS solution demonstrates a strong interaction with oil and the great potential to increase both volumetric sweep efficiency and microscopic displacement efficiency in EOR.
1. A functional polymeric surfactant, comprising:
a) a first repeating monomer unit having a first formula of
b) a second repeating monomer unit having a second formula of
c) a third repeating monomer unit having a third formula of
wherein R 0 and R 2 are hydrogen or C 1 -C 4 alkyl;
wherein the hydrophilic moiety is hydrophilic and selected from the group consisting of anionic, cationic, nonionic, zwitterionic, betaine, and amphoteric ion pair;
wherein an oil phase-aqueous phase IFT value of the functional polymeric surfactant is from about 0.1 to about 15 dyne/cm;
wherein the content of the second repeating monomer unit is about 2% to about 15% in the functional polymeric surfactant;
wherein the second repeating monomer unit is selected from the group consisting of
wherein R L is an alkyl, phenyl or derivatives of the alkyl or phenyl; and X − is Cl − or Br − , Ac − ,NO 3 − , or ½SO 4 2− , and G represents a bis-ammonium Gemini surfactant moiety.
2. The functional polymeric surfactant of claim 1 , wherein the second repeating monomer unit is selected from the group consisting of
wherein n is an integer from 8 to 20 and X − =Cl − , Br − , Ac − ,NO 3 − , or ½SO 4 2− .
3. The functional polymeric surfactant of claim 2 , wherein the third-repeating monomer unit is selected from the group consisting of
wherein R L is an alkyl, phenyl or derivates of the alkyl or phenyl; EO represents —CH 2 —CH 2 —O—, and c is an integer from 8 to 18.
4. The functional polymeric surfactant of claim 2 , wherein the third repeating monomer unit is
wherein n is an integer from 8 to 20; EO represents —CH 2 CH 2 O—, and p is an integer from 6-20.
5. A functional polymeric surfactant, comprising a polymeric reaction product of:
a) a first monomer having a first formula of
b) a hydrophobic monomer having a second formula of
c) a hydrophilic monomer having a third formula of
wherein R 0 and R 2 are hydrogen or C 1 -C 4 alkyl;
wherein the hydrophilic moiety is hydrophilic and selected from the group consisting of anionic, cationic, nonionic, zwitterionic, betaine, and amphoteric ion pair;
wherein an oil phase-aqueous phase IFT value of the functional polymeric surfactant composition is from about 0.1 to about 15 dyne/cm;
wherein the content of the hydrophobic monomer having the second formula is about 2% to about 15% in the functional polymeric surfactant;
wherein the hydrophobic monomer is selected from the group consisting of
wherein R L is an alkyl, phenyl or derivatives of the alkyl or phenyl; and X − is Cl − , or Br − , Ac − ,NO 3 − , or ½SO 4 2− , and G represents a bis-ammonium Gemini surfactant moiety.
6. The functional polymeric surfactant of claim 5 wherein the hydrophobic monomer is selected from the group consisting of
wherein n is an integer from 8 to 20 and X − =Cl − , Br − , Ac — ,NO 3— , or ½SO 4 2— .
7. The functional polymeric surfactant of claim 5 wherein the hydrophilic monomer is selected from the group consisting of
wherein R L is a an alkyl, phenyl or derivates of the alkyl or phenyl; EO represents —CH 2 —CH 2 —O—, and c is an integer from 8 to 18.
8. The functional polymeric surfactant of claim 5 wherein the hydrophilic monomer is selected from the group consisting of
wherein n is an integer from 8 to 20; EO represents —CH 2 CH 2 O—, and p is an integer from 6-20.