SEPARATE LAYER RECOVERY OF SHALLOW HEAVY OIL RESERVOIR WITH STEAM INJECTION

The shallow heavy oil reservoirs in Karameyi Oilfield of Xinjiang Region are very heterogeneous. Steam override is serious during thermal oil recovery operations. Therefore, recovery rates in the middle and top layers of the reservoirs are relatively high, but those from the bottom layers are low. This influences the exploration efficiency of reservoirs. To solve these problems the thermoespansion packers combined with multi-cycle steam stimulation we used different modes of operation:including blocking the upper zones and producing the lower zones, and vice versa and plugging. These techniques have been used in 124 times steam injection for more than four years. The success ratio is 93.5%, cumulative oil production has increased by 28,705 tons. Results show these techniques are simple and easy to operate.