Phenomenological model of an open-type geothermal system on the basis of oil-and-gas well

Mykhailo Fyk,Volodymyr Biletskyi,V Bondarenko,O Malova,I Kovalevska,F Cawood,M Hardygora,R Lysenko

doi:10.1051/e3sconf/202020101035

Mykhailo Fyk, Volodymyr Biletskyi + Show 6 more

Open Access

https://doi.org/10.1051/e3sconf/202020101035

Copy DOI

Abstract

This paper relates to mining-well technologies. A theoretical and methodological approach is proposed to modeling geothermal well systems, which includes the development of: principal technological scheme of a geothermal system; schemes of transformation and movement of energy and a heat-transfer medium; the geothermal system phenomenological model; analysis of subprocesses and obtaining their mathematical models and, on this basis, the mathematical model of the geothermal model as a whole. An example of an advanced open-type geothermal well system is studied, which is based on the oil-and-gas well with one loop of circulation and the parallel connection of heat pumps at characteristic points of the system. The subprocesses of the developed phenomenological model are analysed and the characteristic features of their mathematical description are revealed; in particular, it is substantiated that the redistribution of heat power entering from a fluid-saturated bed is substantially dependent on the lateral wellbore geometry. Another important feature is to model the downhole heat pump and the modes in the scheme as a whole, which is based on the mass flow rate of a heat-transfer medium in its circulation loop. A generalized formula is presented for the heat power of the analysed advanced geothermal well system.

Highlights

This work is devoted to the research and methodological approaches development for modeling open geothermal mining-well systems of depleted and existing oil-and-gas fields [1 – 12]
The last process is possible if to take into account the capabilities of modern magnetic coolers and bottom-hole heat exchangers, which are proposed by the authors to implement into the circuit practice at the bottom hole and in the lateral wellbores of the well bottom hole network system
A theoretical and methodological approach is proposed to modeling geothermal miningwell systems, which includes the development of: principal technological scheme of a geothermal system; schemes of transformation and movement of energy and a heat-transfer medium; the geothermal system phenomenological model; analysis of subprocesses and obtaining their mathematical models and, on this basis, the mathematical model of the geothermal model as a whole

Summary

Introduction

This work is devoted to the research and methodological approaches development for modeling open geothermal mining-well systems of depleted and existing oil-and-gas fields [1 – 12]. On the basis of one oil-and-gas well (which belongs to the geothermal fund), a geothermal system is constructed using heat exchange process between the mine rock and a heat-transfer medium. Heat exchange of a heat-transfer medium upflow occurs in the productive bed, bottom-hole zone, bottom hole [4 – 5] and in the underground columns [6, 9].

Objectives

Methods

Results

Conclusion