Effect of Ethylene-vinyl Acetate Copolymer/Amino-functionalized Polymethylsilsesquioxane Composite Wax Inhibitor on the Rheological and Wax Depositing Characteristics of Waxy Crude Oil
2020
In this paper, a
novel ethylene-vinyl acetate copolymer (EVA)/amino-functionalized
polymethylsilsesquioxane (PAMSQ) composite wax inhibitor (WI) was
prepared through melt blending, and the rheological and wax depositing
properties of the doped crude oil were studied. The EVA/PAMSQ composite
can strongly crystallize with wax molecules and trigger the formation
of compact wax flocs, which greatly improve the rheological properties
of crude: compared to the pure EVA at the same dosage, the composite
can further decrease the gel point and apparent viscosity (25 °C)
by 14.6 °C and 92.0%, respectively. The wax deposition can also
be inhibited by adding the composite: adding EVA inhibits the mass
of the wax deposit at 24 h by 62.3%, and this number is suppressed
by 77.9% after adding the EVA/PAMSQ composite, but the wax molecule
diffusion is accelerated and the wax content in the wax deposit rises
because of the improved crude oil rheological characteristics. Here,
we develop the gel structure theory to consider the wax deposition
process affected by the WI. Adding the WI contributes little to the
wax precipitation temperature but decreases the gel structural strength
of the oil a lot, and thus, the oil near the pipe wall can only form
the wax deposit with a higher wax content to resist the pipe wall
shearing. Therefore, the crude oil added EVA/PAMSQ composite possesses
not only the lowest wax deposit rate and the highest aging rate but
also the highest wax content in the wax deposit.
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