The present invention relates to a process for extracting a crude oil from a rock formation containing it, comprising the following steps: (i) a first step of forced injection of a modified alkylphenol-aldehyde resin into the rock formation containing a crude oil, then (ii) a second step of extracting the crude oil from the rock formation.

The invention is related to a joint application process of two treatments, scale removal and inhibitor squeeze injection. Through the simultaneous positioning inside the reservoir, it can be applied in scale removal operations for carbonate formations, such as the pre-salt case. Accordingly, there is a way to improve the efficiency of reservoir management, through an innovation in the scaling management process.

An antifoulant composition for a gas processing plant, the composition having a phosphonothioic ester; a non-ionic surfactant; and a film forming surfactant. A method for inhibiting fouling in a gas processing plant, the method (a) providing an antifoulant composition; and (b) adding the antifoulant composition to a hydrocarbon stream present in a gas processing plant.

An antifoulant composition for a gas processing plant, the composition having a phosphonothioic ester; a non-ionic surfactant; and a film forming surfactant. A method for inhibiting fouling in a gas processing plant, the method (a) providing an antifoulant composition; and (b) adding the antifoulant composition to a hydrocarbon stream present in a gas processing plant.

Citrate polyester additives for crude oils, mixtures of the citrate polyester additives and crude oils, and methods for producing or forming the mixtures are provided. The mixtures and methods comprise at least one citrate polyester additive introduce or applied to crude oil, wherein the at least one citrate polyester additive comprises one or more citrate crosspolymers.

Citrate polyester additives for crude oils, mixtures of the citrate polyester additives and crude oils, and methods for producing or forming the mixtures are provided. The mixtures and methods comprise at least one citrate polyester additive introduce or applied to crude oil, wherein the at least one citrate polyester additive comprises one or more citrate crosspolymers.

Compounds comprising multiple hydrophilic heads and a lipophilic tail may be employed into fluids to inhibit agglomeration of hydrates, among other things. Suitable hydrophilic heads may include secondary, tertiary, and/or quaternary ammonium cation moieties, phosphonium cation moieties, and combinations thereof. Such LDHI compounds may provide enhanced interactivity with hydrate crystals and/or hydrate-forming molecules. These compounds may be employed in fluids in various environments, such as a conduit penetrating a subterranean formation, or a conduit carrying fluid in an industrial setting.

Compounds comprising multiple hydrophilic heads and a lipophilic tail may be employed into fluids to inhibit agglomeration of hydrates, among other things. Suitable hydrophilic heads may include secondary, tertiary, and/or quaternary ammonium cation moieties, phosphonium cation moieties, and combinations thereof. Such LDHI compounds may provide enhanced interactivity with hydrate crystals and/or hydrate-forming molecules. These compounds may be employed in fluids in various environments, such as a conduit penetrating a subterranean formation, or a conduit carrying fluid in an industrial setting.

The present invention relates to a composition comprising: at least one copolymer of which at least one of the repeating units comprises at least one amide function; and at least one polyether having a molecular weight (Mw) greater than 60 g.mol.sup.-1. The invention also relates to the use of said composition for delaying, or even preventing, the formation of gas hydrates, in particular in a method for extracting oil and/or gas and/or condensates, as well as to the method for delaying, or even preventing, the formation and/or agglomeration of gas hydrates, using a composition as defined above.

A method of reducing the viscosity of a crude oil, the method comprising adding to the crude oil (i) a surfactant compound including at least two hydrophobic groups wherein the resultant mixture has a water content of less than 10 vol %.