Compositions and methods for treating a water blocked well using a nonionic fluorinated surfactant
AssigneesBoard of Regents, The University of Texas, 3M Innovative Properties Company
InventorsGary A. Pope, Jimmie R. Baran, Jr., Vishal Bang, John D. Skildum, Mukul M. Sharma
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Abstract
The present invention includes a method of treating a hydrocarbon-bearing clastic formation having non-connate water by contacting the hydrocarbon-bearing clastic formation with a composition that includes a solvent and a nonionic fluorinated polymeric surfactant wherein the solvent at least partially displaces or solubilizes the water in the formation.
Claims20
A method of treating a hydrocarbon-bearing clastic formation having water, the method comprising contacting the hydrocarbon-bearing clastic formation with a composition comprising solvent and a nonionic fluorinated polymeric surfactant, wherein the nonionic fluorinated polymeric surfactant comprises:
- at least one divalent unit represented by formula:
- a poly(alkyleneoxy) segment;
- wherein
- Rf represents a perfluoroalkyl group having from 1 to 8 carbon atoms;
- R and R2 are each independently hydrogen or alkyl of 1 to 4 carbon atoms;
- and
- n is an integer from 2 to 10;
- and
- wherein the solvent at least partially displaces or solubilizes the water in the hydrocarbon-bearing formation, wherein the water is non-connate water or wherein the hydrocarbon-bearing formation comprises a water-bearing well.
A method of treating a tight gas formation or a hydrocarbon-bearing clastic formation that is not free-flowing, the method comprising contacting the tight gas formation or the hydrocarbon-bearing clastic formation that is not free-flowing with a composition comprising a solvent and a nonionic fluorinated polymeric surfactant, wherein the nonionic fluorinated polymeric surfactant comprises:
- at least one divalent unit represented by formula:
- a poly(alkyleneoxy) segment;
- wherein
- Rf represents a perfluoroalkyl group having from 1 to 8 carbon atoms;
- R and R2 are each independently hydrogen or alkyl of 1 to 4 carbon atoms;
- and
- n is an integer from 2 to 10,
- wherein contacting the hydrocarbon-bearing formation that is not free-flowing comprises contacting the formation with the composition in a sufficient amount to cause the formation to become free-flowing.
A method of reconditioning an at least partially water-blocked hydrocarbon-bearing formation treated with a first wettability modifier, wherein the first wettability modifier comprises a nonionic fluorinated polymer, comprising:
- at least one divalent unit represented by formula:
- a poly(alkyleneoxy) segment;
- wherein
- Rf represents a perfluoroalkyl group having from 1 to 8 carbon atoms;
- R and R2 are each independently hydrogen or alkyl of 1 to 4 carbon atoms;
- and
- n is an integer from 2 to 10,
- the method comprising:
- contacting the hydrocarbon-bearing formation with a fluid that does not include the nonionic fluorinated polymer, wherein the fluid at least partially displaces or solubilizes the water in the formation.
Dependencies are inferred from the claim text.