A tracer technique and interpretation method of egs magnetic nanoparticles

Abstract

The invention provides an EGS magnetic nanoparticle tracer technology and interpretation method; the method first completes the screening of the magnetic nanoparticle through the surface modification technology of the magnetic nanoparticle and the thermal stability analysis of the high-temperature and high-pressure reactor, and the configuration is suitable for diffusivity and magnetic nanoparticles with controllable thermal stability; on this basis, the core penetration test was carried out, the change of the concentration of magnetic nanoparticles was analyzed by sampling, the connectivity of the EGS was plotted, and the heat exchange area of ​​the rock injected into the water was calculated. At the same time, the electrical measurement technology is used to obtain the distribution of electromagnetic signals after the magnetic nanoparticles enter the reservoir, and the method of inverting the reservoir connectivity and calculating the heat transfer area by using the resistivity, and the connectivity and heat transfer area obtained from the concentration change of the magnetic nanoparticles Calibration is performed to develop magnetic nanoparticle tracking techniques and interpretation methods.

Description

technical field [0001] The invention belongs to the technical field of heat storage engineering in deep underground reservoirs; in particular, it relates to an EGS magnetic nano particle tracing technology and an interpretation method. Background technique [0002] Geothermal energy is a clean, low-carbon, widely distributed, resource-rich, safe and stable renewable energy that will play an important role in the development of clean energy in the future. Enhanced Geothermal System (EGS) is a geothermal system that economically extracts deep thermal energy from low-permeability rock mass through artificial thermal storage. The amount of geothermal resources based on EGS technology is huge, and it is hailed by the industry as the future of geothermal energy. It is an international frontier and emerging hotspot in geothermal resource research, and will occupy a pivotal position in future geothermal energy development and thermal energy storage. [0003] As an indispensable key...

AI Technical Summary

Problems solved by technology

However, there are still two key problems in the application of nanoparticle tracer technology: one is the high cost of monitoring, the drilling cost of monitoring wells and the monitoring cost of tracer sampling are very high; the other is that the thermal stability of nanoparticles is unknown. Coagulation behavior is likely to occur under high temperature and high pressure conditions, making it difficult to achieve the purpose of tracing

[0006] The use of tracer technology to evaluate the heat transfer area of ​​EGS is one of the most important indicators to measure its heat transfer effect, but it is limited by the difficulty of manual control of traditional tracers, the high cost of new tracer monitoring and the existence of thermal stability and adsorption The unknown difficulty has become the key difficulty in the evaluation of EGS heat transfer area

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