Patent ID: 8450250

Claim:
A method of preparing a drag reducing polymer comprising: preparing the drag reducing polymer with a solubility parameter within 4 MPa 1/2 of the solubility parameter of a liquid hydrocarbon; wherein the drag reducing polymer is able to be injected into a pipeline, such that the friction loss associated with the turbulent flow through the pipeline is reduced by suppressing the growth of turbulent eddies, into the liquid hydrocarbon having an asphaltene content of at least 3 weight percent and an API gravity of less than about 26° to thereby produce a treated liquid hydrocarbon wherein the viscosity of the treated liquid hydrocarbon is not less than the viscosity of the liquid hydrocarbon prior to treatment with the drag reducing polymer; the drag reducing polymer is added to the liquid hydrocarbon in the range from about 0.1 to about 500 ppmw; and a plurality of the repeating units comprise a heteroatom.