Method for analyzing microscopic seepage law of thermal reservoir recharge water

Abstract

The invention discloses a method for analyzing a microscopic seepage law of recharge water of a thermal reservoir, which comprises the following steps of: providing a core model which is transparent, is internally provided with a pore throat and a crack, and is provided with an injection end and an outflow end; vacuumizing the rock core model, saturating formation water and then heating to a preset temperature; continuously injecting the first recharge water containing the dyeing tracer agent into the rock core model through the injection end to displace formation water, and recording a first flowing process video; analyzing the swept area, the leading edge breakthrough time and the breakthrough speed of the first recharge water in the rock core model through image processing; continuously injecting second recharge water containing a multi-temperature-section temperature-sensitive tracer into the rock core model through the injection end to displace formation water, and recording a second flowing process video; and based on the color change of the second recharge water in different areas, analyzing the temperature field change of the second recharge water through image processing. According to the present invention, direct analysis on the microscopic seepage law and the heat exchange change characteristics of the recharge water are achieved.

Description

technical field [0001] The invention relates to the technical field of development and utilization of geothermal resources, and more specifically relates to a method for analyzing microscopic seepage laws of recharge water in thermal reservoirs. Background technique [0002] Geothermal recharge is a measure to avoid thermal and chemical pollution caused by direct discharge of geothermal wastewater, and it plays an important role in maintaining the pressure of heat storage and ensuring the technical conditions for the exploitation of geothermal fields. Geothermal recharge is to pour geothermal wastewater, normal temperature groundwater, surface water and even sewage into the thermal storage. Its purpose is as follows: [0003] (1) The temperature of geothermal wastewater is generally higher than the ambient temperature, which usually contains high salt content, and some chemical components are toxic and harmful. The direct discharge of geothermal wastewater may cause thermal ...

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Problems solved by technology

[0005] (3) Maintain the fluid pressure of the heat storage and maintain the mining conditions of the geothermal field. Generally speaking, the exploitation of geothermal energy will lead to a decrease in the pressure of the heat storage. If the amount of extraction is too large, the pressure of the heat storage will continue to decrease when the balance between recharge and mining is lost. , reduce the production capacity of geothermal field, even lose production capacity and cause land subsidence

[0009] Indoor core flow experiments are commonly used to analyze the flow law of fluids in porous media and fractured media. However, natural cores for fractured heat storage are not easy to obtain, and cores do not have visualization features, so they cannot intuitively analyze the microscopic seepage of recharged water. Regularity and ripple characteristics

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