Zaoyuan Heavy Oil Extraction Technology

With conventional oil reserves that can be found less and less,heavy oil will become the important energy resources in the21st century.Due to high colloid and asphaltene content, the viscosity of heavy oil is high.So it is much more difficult to drill for heavy oil than regular oil.Although the steam flooding is the most popular process used in the viseouse rude recover nowadays, it will eonsume much energy to produce high temperature steam,In recent years,many kinds of viseosity-redueing agents have been applied in the viseous crude reeovery.The viseosity of viseous crude will be dramatically decreased with the transformation from water-in-oil to oil-in-wateremulsion.The viscosity reduction by emulsifying of heavy oil is researched and used the most widely in chemical visbreaking.First in this paper,through lab experiments,used Zao Yuan and Nei Meng heavy oil,the optimum formula is obtained by orthogonal tests,and emulsifier concentrations,oil-water ratio, temperature on the effect of emulsified heavy oil are studied systematically.Then,through spot experiments,proved Heavy oil viscosity reduction effect on the viscosity of heavy oil has greatly improved.The experimental results show that:the viscosity of heavy oil is depressed by more than80%at50℃.And then optimized the formula as to the viscosity of heavy oil is depressed by more than80%.The higher viscosity reducer concentration is,the lower emulsion viscosity is;but when the concentration increases to a certain extent,emulsion viscosity becomes no longer change;the bigger the oil-water ratio is,the higher emulsion viscosity is;the salinity is bigger,the effect of viscosity reducer for heavy oil becomes worse and the emulsion is less stable;while increasing temperature, the emulsion viscosity is slightly lower.