LABORATORY STUDY OF USING MULTIFUNCTIONAL VISCoSITY REDUCER HG-D FOR VISCOUS CRUDE OIL

The viscous crude oil of the 8th square of Dagang Oilfield has the difficurty for onrecovery due to its high pour point and high viscosity. A HG-D type multifunctional viscosity reducerfree of chlorine and sulfur formulated by a polymer contained long-chain ethylenic base, a non-ion sur-face active agent, and a gravity increasing agent was added to the crude oil in the laboratory. The resultshowed that the said viscosity reducer had good effects on pour point depressing, viscosity reducing andparaffin removal. The average viscosity reduced around 50%; the pour point depressed to about 0℃;and the paraffin removal rate was more than 3mg/mL min. The said viscosity reducer had certain paraf-fin removing effect, which could replace the paraffin remover.