A method of reservoir modification by cyclic thermal treatment of hydrated shale

Abstract

This invention belongs to the field of oil and gas field development and discloses a method for reservoir stimulation of hydrated shale through cyclic thermal treatment. The method includes pre-treating the hydrated shale according to requirements; setting cyclic thermal treatment parameters before the cyclic thermal treatment, including the number of cycles, heating rate, heating temperature, holding time, and cooling method; implementing cyclic heating-cooling treatment on the pre-treated hydrated shale, with each cycle first heating to the set heating temperature at the set heating rate, then cooling to the target temperature using a preset cooling method, repeating this process until the set number of cycles is reached; real-time monitoring indicators are obtained during the cyclic thermal treatment of the hydrated shale, including temperature, stress, and seepage data of the hydrated shale, and the monitoring indicators are processed using an evaluation method, with the treatment effect evaluated after completion. The core objective of this stimulation method is to eliminate the formation hydration effect after fracturing, improve formation porosity and permeability, and increase shale gas extraction efficiency.

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