《Table 4.Steam flooding experiment results under 250C.》

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《Air-SAGD technology for super-heavy oil reservoirs》

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For the core and super-heavy oil in the target layer，the experiment of displacement efficiency of steam flooding with the oxidized super-heavy oil under various temperatures is carried out under the constant temperature condition by using the one-dimensional long core flooding device.The length of core is 30.0 cm with a diameter of 3.0 cm.The porosity is36.8%and the water phase permeability is 1.91?m2.First，the super-heavy oil is oxidized under the condition of AOR of12.0 cm3/g to get the experimental oil samples of different oxidation temperatures.Then，steam flooding experiment is conducted at the temperature of 250?C.The experimental results are as shown in Table 4.It can be seen that different oxidation temperatures have significant influence on the oil displacement efficiency of steam flooding of super-heavy oil.In the experimental temperature range，oil displacement efficiency of steam flooding decreases by 16.54%-23.89%and residual oil saturation increases by 12.50%-18.17%under temperature of 250?C with oxidized super-heavy oil.The main reason is that the SARA components varied greatly（Table 2）after the oxidation reaction of the super-heavy oil.On the one hand，the viscosity of super-heavy oil increases（Table1）.On the other hand，the content of asphaltene in the super-heavy oil greatly adds，resulting in the enhanced adhesion of the super-heavy oil on the rock，and consequently making more driving force be needed when the steam drives the residual oil.At the same time，the saturated hydrocarbon（light component）in the super-heavy oil decreases significantly，indicating that the steam distillment is weakened during steam flooding.