DETERMINATION OF PARAFFIN DEPOSITION AND RATIONAL THERMAL-WASH CIRCLE IN PRODUCER DURING POLYMER FLOODING

For the serious problem of paraffin deposition during polymer flooding in Daqing Oilfield, analyzed the composition of produced crude oil and paraffin, and tested gas chromatogram of satisfied hydrocarbon, compared the results to water flooding, the content of saturated hydrocarbon in oil sample is lower,while the content of aromatic hydrocarbon and asphaltum is higher, but the difference is small; the content of saturated hydrocarbon and aromatic hydrocarbon in paraffin sample is apparently lower,while the content of asphaltum is much higher. Simulation experiment of dynamic pipe-flow shows that polyarylamide (PAM) has effect on inhibiting paraffin crystal forming and deposition. Analysis results of numerical simulation show that paraffin deposit rate is higher in producer during polymer flooding, generally, the paraffin deposit point is at about 400~600 m, and Rational thermal-wash circle should be less than 30 days.