| 摘要 |
Reaction products of polymeric alkyl phenol formaldehyde resins are useful as additives to inhibit or prevent the deposition or precipitation of asphaltenes in hydrocarbon fluids, particularly crude oil produced from a subterranean formation. These reaction products are formed by reacting a polymeric alkyl phenol formaldehyde resin with a co-reactant having functional groups including, but not necessarily limited to, amines, esters, silanes, ketones, epoxides, alkoxides, aryloxides, halogens, alkali metals, alkali earth metals, acetamides, non-metal oxides, metal oxides, where the co-reactant optionally has a carbon chain length between 1 and 22 and the reaction is conducted in the presence of at least one of various solvents. In one non-limiting embodiment, the co-reactant is a silicon derivative. The asphaltene inhibitors have utility when injected into a subterranean formation while oil production temporarily halts, a process called “squeezing,” because they are retained to a degree in the formation as the crude oil is produced. |
| 主权项 |
1. A method of inhibiting or preventing asphaltene deposition in a hydrocarbon fluid containing asphaltenes, the hydrocarbon fluid initially being within a subterranean formation, the method comprising:
introducing to the hydrocarbon fluid from about 10 ppm to about 2000 ppm, based on the hydrocarbon fluid, independent of any water present, of asphaltene inhibitor effective to inhibit or prevent asphaltene deposition therein, where the asphaltene inhibitor comprises a reaction product of:
an organic polymer which inhibits the precipitation of asphaltenes, where the organic polymer is selected from the group alkylphenol formaldehyde resins, alkylphenol formaldehyde amine resins, polyalkylsuccinic anhydrides, polyalkylsuccinic anhydride pentaerythritol condensate polymers, maleic anhydride alpha olefin polyesters, maleic anhydride fatty amine polyamides, sorbitan polyesters, alkyl polyacrylate esters, and combinations therein, witha co-reactant having functional groups selected from the group consisting of amines, esters, silanes, ketones, epoxides, alkoxides, aryloxides, halogens, alkali metals, alkali earth metals, acetamides, non-metal oxides, metal oxides and combinations thereof and where the co-reactant is one previously specified having a carbon chain length between 1 and 22 carbons; and adsorbing, crosslinking, or complexing the asphaltene inhibitor with reservoir rock of the subterranean formation in the presence of water. |
