Viscosity reducing recovery technology of the deep heavy oil of Tahe Oilfield by mixing light oil

According to the geologic feature of deep heavy oil reservoir and the property of the heavy oil in Tahe Oilfield,the laboratory experiments and the field tests for the viscosity reducing recovery technology of the deep heavy oil by mixing light oil are finished.The factors of influencing the viscosity of the heavy oil are analyzed by laboratory experiments.The viscosity reducing principle and the viscosity reducing law of the heavy oil by mixing light oil are discussed.The effects of the mixing ratio of heavy oil to light oil and the difference between the viscosity of heavy oil and light oil on the viscosity reducing rate are studied by the mixing of the heavy oil from three heavy oil wells with the light oil from light oil wells under the condition of certain temperature.The results show that there is the greatest reduction of the viscosity of the heavy oil when the volume ratio of heavy oil to light oil is 1:1,and the viscosity rate of the heavy oil can reach to above 95%.The field tests show that,the viscosity reducing technology and technologic pipe string have good universality to the different recovery modes and different heavy oil water-cut of Tahe Oilfield,and the input to output ratio of the viscosity reducing recovery technology is 1:7.