Efficient numerical simulation method and device for urban scale geothermal field group well system

Abstract

Embodiments of the invention disclose an efficient numerical simulation method and device for an urban scale geothermal field group well system. The method comprises the steps of obtaining geologicaldata of a geothermal field to determine a range of a model calculation area, and building a three-dimensional geological numerical model of a research area according to a geological section map; determining water-heat initial conditions of the model; partitioning heat storage parameters, and distinguishing a heat storage layer and a heat coverage layer; determining water-heat boundary conditions of the whole simulated heat storage system; simplifying geothermal wells into one-dimensional linear geometry, and adding the geothermal well linear geometry into the model according to a distributiondiagram and coordinates of the geothermal wells; setting inflow and outflow boundary conditions of temperatures and fluids for the geothermal wells, and considering a heat exchange process of the fluids in the geothermal wells and surrounding rock masses by adopting an equivalent heat exchange coefficient, wherein the influence of a sleeve pipe and a mortar layer is also contained in the equivalent heat exchange coefficient; and setting a time period function for the model and discretizing each year into two time periods including a heating season and a non-heating season. The difficult problems of grid division and calculation speed of three-dimensional simulation of urban scale geothermal fields can be solved.

Description

technical field [0001] The embodiments of the present invention relate to the field of geothermal recharge simulation analysis and simulation, and in particular to an efficient numerical simulation method and device for urban-scale geothermal field group well systems. Background technique [0002] Since the 1980s, urban deep geothermal exploitation has made remarkable progress in some cities in northern my country. For example, the number of deep geothermal wells in Beijing and Tianjin has exceeded 500, and the number of geothermal wells in Xiong County, Hebei Province has exceeded 60. At present, the national deep geothermal heating area has reached 102 million m 2 . However, due to the low degree of resource exploration, imperfect management system, and lack of unified technical specifications and standards, long-term "predatory" mining (extracting a large amount of geothermal water without recharging) has led to a year-by-year decline in groundwater levels and insufficien...

AI Technical Summary

Problems solved by technology

For urban-scale geothermal well systems, when dozens of geothermal wells are included in the numerical model, grid division and calculation speed are faced with huge challenges, and it is difficult to meet the actual needs of the project

Images