Experimental Research on Compressive Coefficient of Heavy Oil Reservoir in Bohai Bay Oil Field

In the process of heavy oil development, steam stimulation is usually used. In steam stimulation, the oil field is produced by depleted development after the end of shut in well. The magnitude of reservoir compressive coefficient is significant for the improvement of heavy oil recovery. The compressive coefficient of heavy oil reservoirs in Bohai oil field was tested by using self-designed servo control compressive coefficient equipment. It is found with the increase of the effective confining pressure; the core is gradually compacted and the resistance to deformation increases, so the compressive coefficient decreases with the increase of the effective confining pressure, and the decreasing rate decreases with the increase of the effective confining pressure. Due to the cementing, strength of the core with high porosity is lower, so it is easier to produce deformation under external load, and the compressive coefficient increases with the increase of the core porosity, but with the increase of the effective confining pressure, the difference of the compressive coefficient of the rocks with different porosities decreases. The experimental results provided an experimental support for the prediction of the production capacity of the heavy oil reservoir in Bohai oil field during the thermal recovery process.