Method and device for detecting groundwater non-Darcy flow field in single well circulating geothermal system

Abstract

The invention provides a method and device for detecting groundwater non-Darcy flow field in a single-well circulating geothermal system. The method includes: establishing a mathematical model, establishing a control equation, determining the initial condition of the control equation, and establishing the boundary of the control equation Conditions; use an approximate method to process the nonlinear term in the control equation, do Laplace transform to the control equation, initial conditions and boundary conditions, and obtain the transformed control equation, initial conditions and boundary conditions; The transformed governing equations, initial conditions and boundary conditions are subjected to finite Fourier cosine transformation to obtain transformed partial differential equations; the transformed partial differential equations are solved, and through Laplace inverse transformation, single well circulation shallow Analytical solution of non-Darcy flow of groundwater in layered geothermal system in Laplace domain; use Stehfest numerical inversion method to obtain the solution in time domain corresponding to the analytical solution to detect non-Darcy flow of groundwater The drawdown distribution of the field.

Description

technical field [0001] One or more embodiments of this specification relate to the technical fields of new energy, renewable energy and hydrogeology, and in particular to a method and device for detecting groundwater non-Darcy flow field in a single-well circulating geothermal system. Background technique [0002] As a renewable energy, geothermal energy has the advantages of cleanness, safety, and large reserves. More importantly, compared with renewable clean energy such as wind energy, solar energy, and tidal energy, the continuous and stable supply of geothermal energy has advantages over other renewable energy sources. incomparable. At present, shallow geothermal energy is widely used in heating. It has the advantages of simple development and utilization, good economy, and stable system. With the continuous development and improvement of geothermal heating system, it will occupy an important position in my country's heating market. [0003] As a new technology for hea...

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Problems solved by technology

However, the inventors found that the current problems of groundwater flow in single-well circulating shallow geothermal systems are mainly focused on Darcy flow, and there are basically no studies on non-Darcy flow.

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