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In order to solve the problems of high energy consumption and easy plugging of high pour point crude oil during oil extraction and transportation, the pour point depression effect of BEM-5P pour point depressant on high pour point crude oil in Bay an Oilfield was studied ・ The effects of factors such as pour point depressant concentration, crude oil water content, dosing temperature, repeated heating, high-speed shear, and crude oil stillness on the pour point depression and viscosity reduction effect of crude oil were explored, as well as the effect of pour point depressant on crude oil dehydration effect. The result shows that BEM-5P pour point depressant has a significant pour point depression effect on Bay an crude oil. The higher the concentration of the pour point depressant, the lower the pour point and viscosity of the crude oil;the higher the water content of crude oil, the worse the pour point depression effect; when the dosing temperature is 75 °C, the viscosity reduction effect is the best. When the crude oil temperature is below 55 °C, the crude oil temperature has a positive impact on the viscosity reduction effect, and when it exceeds 55 °C, the crude oil temperature has a negative impact on the viscosity reduction effect・ Repeated heating and highshearing have little effect on solidification point and viscosity; the static state of 72 h of crude oil has a small impact on the pour point and a significant impact on the viscosity; the dewatering effect of the pour point depressant plays a negative role. Compared with thermochemistry sedimentation, the effect of the pour point depressant on the electrochemical sedimentation is less. [ABSTRACT FROM AUTHOR]

C02, H2S And high salinity are three common corrosion factors in oilfield produced water. When three corrosion factors coexist, the corrosion behavior is much more complex than when CO2, H2S and high salinity act alone・ Using the reactor to simulate the actual operating conditions of high salinity produced water with the simultaneous presence of CO2 and H2S, the corrosion behavior of three carbon steels, 20G, L245N, and L360Q, was studied under conditions of CO2 partial pressure of 0. 15,0 ・ 75, 1.5 MPa, H2S partial pressure of 0・ 000 15 MPa, and temperature of 50,60,70 °C in the corrosive environment of high salinity produced water in oil fields・ The results indicate that the three types of carbon steel exhibit severe corrosion in high salinity extracted water systems of oil fields where C02/H2S coexists, with a maximum corrosion rate exceeding 3.4 mm/a, and corrosion is more severe in liquid phase than in gas phae・ As the corrosion time prolongs, the overall corrosion rate shows a fluctuating downward trend; as the experimental temperature increases, the corrosion rate shows an overall increasing trend; under three different partial pressure conditions, the corrosion rate first increases and then decreases with the increase of CO2 partial pressure, and reaches its maximum at a partial pressure of 0・ 75 MPa; the corrosion rate order of the three materials is L245N > L360Q > 20G, and the corrosion resistance order is 20G > L360Q > L245N. [ABSTRACT FROM AUTHOR]

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