The large caves are important storage space in fractured reservoirs in Tarim oilfield. The formation mechanism of the caves is very complex, but their structure is relatively simple. The large caves are the foundations of a complex vuggy reservoir. Currently the main method of exploitation of such reservoirs is based on mining. In order to study the variation of the bottom hole pressure and the production rate under the elastic mining conditions, a simple theoretical analysis and some physical simulation experiments were conducted. The theoretical analysis and experimental simulations give consistent results, which indicates that the bottom hole pressure decreases exponentially. The exponent is related to the well head production control, oil and water volumes in the caves and compressibility. The oil well production also decreases exponentially with time, and the curve of the cumulative production vs. the cumulative drawdown pressure is linear. The slope can be interpreted as the cumulative fluid production per unit of pressure drawdown, which is only related with the oil and water volumes and compressibility, and by which the cave volume range can be estimated.
Experimental Study of Elastic Minning in a Cave of No-supply Type[J]. Science & Technology Review, 2011, 29(11-02): 41-43 https://doi.org/10.3981/j.issn.1000-7857.2011.02.006
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