Abstract
In order to study the flow mechanisms in porous media of shale reservoirs in the process of primary production, the shale cores from the Jiyang sag of Dongying district were selected to conduct the experiments under 15MPa and 25 °C condition. As comparison, experiments were also performed with tight sandstone cores. Results indicate that the production decreases fast for sandstones, and the oil production cycle is short, generally less than one hour. While for shale samples, oil recovery shows the same tendency in the early stage, followed by a very slow and long production cycle which can last up to 150 hours or more. Based on experiment results, the conventional flow model is modified by taking the desorption process into account, which can describe the flow mechanism in shale accurately.
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