Abstract
The ever-decreasing oil resources receive more and more attention for the exploration and development of heavy oil reservoirs. Owing to the high viscosity and poor fluidity of heavy oil, it is necessary to use the method of injecting high-temperature fluid in the development process. But, this will cause a significant increase in the temperature in oil reservoir, and thus the compression coefficient of reservoir rock has a greater impact. The compression coefficient of heavy oil reservoirs at different temperatures was tested. The results show that the compression coefficient of rock is closely related to the nature of rock itself and its stress and temperature environment: the compression coefficient increases with the increase in rock porosity; the compression coefficient decreases with the increase in the effective confining pressure and increases with the increase in temperature. When the temperature is low, the increase in the compression coefficient is larger. As the temperature increases, the increase in the compression coefficient tends to decrease gradually. Because the temperature of the reservoir is higher than that of the ground, the influence of the temperature on the reservoir compression coefficient should be taken into account when carrying out the production forecast.
Highlights
With the increasing demands for energy resources and the declining of oil resources, more and more attention is paid to the exploration and development of heavy oil reservoirs
The compression coefficient of the heavy oil reservoir gradually increased with the porosity of the reservoir
The compression coefficient of rocks gradually decreased with the increase in effective confining pressures, while the decrease rate reduced with the increase in effective confining pressures
Summary
With the increasing demands for energy resources and the declining of oil resources, more and more attention is paid to the exploration and development of heavy oil reservoirs. Steam stimulation is an effective thermal recovery method for heavy oils [3]. Newman’s method considers only the relationship between rock compression coefficient and single factors, so the operating errors are large [6,7] The latter obtains rock compression coefficient mainly by measuring the fluid volume flowing out due to the changes in pore volume under certain confining and pore pressure [8]. The current research on the compression coefficient of rock is mainly carried out at room temperature, and the reservoir temperature is much higher than room temperature, especially for the thermal recovery reservoirs, the injection of high-temperature fluid will significantly increase the temperature of the reservoir. In order to study the thermal effect on compression coefficient of heavy oil reservoirs in the process of steam stimulation, the authors carried out experiments on compression coefficient in different temperatures
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