A mathematical model and relevant index prediction for constant-temperature electric heating of dual-horizontal- well SAGD start-up

Xiaoxiong LIU,Youwei JIANG,Yongbin WU,Jialu WANG

Table 1 Basic data of Well-Pair A in a developing block of dual-horizontal-well SAGD in Fengcheng Oilfield, Xinjiang, China.

Name of the parameter Value of the parameter Name of the parameter Value of the parameter Porosity 30% Thermal conductivity of rock 2.38 W/(m?K) Density of formation water 1 000 kg/m3 Specific heat capacity of formation water 4 200 J/(kg?K) Oil saturation 85% Thermal conductivity of formation water 0.58 W/(m?K) Horizontal section length of a single well 800 m Density of crude 965 kg/m3 Density of rock 1 750 kg/m3 Wellbore radius 0.088 9 m Distance between two horizontal wells in a well pair 5 m Initial temperature of the reservoir 20 °C Specific heat capacity of crude 2 469 J/(kg?K) Thermal diffusivity 8.02×10-7 m2/s Thermal conductivity of crude 0.14 W/(m?K) Transmission efficiency of electricity 99.56% Specific heat capacity of rock 860 J/(kg?K) Electricity-heat conversion & transmission efficiency 95%