Cameron International Corporation

Neil David Feasey

Tore Nordvik

Rachael Anne Cole

Chandrashekhar Yeshwant Khandekar

Astrid Lone

Neil Grainger

Compositions and methods for preventing the formation of aggregates and for dispersing aggregates and other poorly soluble materials in hydrocarbon fluids. The compositions include an asphaltene dispersant prepared from the reaction of a polyethyleneimine (PEI) dendrimer and one or more derivatizing reagents wherein the polyethyleneimine dendrimer has a weight average molecular weight of greater than or equal to 9 kDa. The methods include emplacing in a wellbore a composition comprising an asphaltene inhibitor, wherein the asphaltene inhibitor is a compound prepared from the reaction of a polyethyleneimine dendrimer and one or more derivatizing reagents wherein the polyethyleneimine dendrimer has a weight average molecular weight of greater than or equal to 9 kDa.

Asphaltene dispersants

A method of performing an oilfield treatment that includes delivering to an oilfield fluid a host-guest complex, wherein the host-guest complex is formed from a solution of host molecule mixed with a guest molecule having opposing solubility from the host molecule; wherein the host molecule is present in the solution in an amount of at least 2&#xd7;10&#x2212;6 M.

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Southampton, United Kingdom

Neil David Feasey