Abstract: This work studies the effects of oil and gas superficial velocities and temperature on wax deposition thickness and carbon number distribution for intermittent flow of waxy mineral white oil and high-pressure air. The results are shown as follows: the wax deposit around the whole pipe, and the shape changes with the oil and gas superficial velocities. The equivalent deposit thickness decreases with increase of gas velocity, while with increase of oil velocity the deposit thickness increases first and then decreases. Equivalent deposit thickness increases first and then decreases with increase of oil temperature, while decreases with increase of wall temperature at a constant oil temperature. Increases of oil and gas velocities lead to increase of deposition hardness, which is characterized by variation of carbon number.

Key words: oil-gas two-phase, intermittent flow, wax deposition, carbon number distribution