Experimental method and experimental device for liquid nitrogen fracturing applied to geothermal development
An experimental method, liquid nitrogen technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve problems such as shortage, and achieve the effects of increasing conductivity, increasing contact area, and improving geothermal recovery.
Active Publication Date: 2021-01-08
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology
For now, there are few theories on the use of ultra-low temperature liquid nitrogen fracturing for geothermal development, especially the lack of corresponding experimental methods to study the experimental process of liquid nitrogen fracturing for geothermal development
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[0031] The details of the present invention can be understood more clearly with reference to the accompanying drawings and the description of specific embodiments of the present invention. However, the specific embodiments of the present invention described here are only for the purpose of explaining the present invention, and should not be construed as limiting the present invention in any way. Under the teaching of the present invention, the skilled person can conceive any possible modification based on the present invention, and these should be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as being “disposed on” another element, it may be directly on the other element or there may also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted", "connec...
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The invention discloses an experimental method and device for application of liquid nitrogen fracturing in geothermal development, and relates to the technical field of geothermal resource development. The experimental method for the application of liquid nitrogen fracturing in the geothermal development comprises the steps that a required rock test piece is drilled, the rock test piece is processed into a shape matched with a confining pressure device, meanwhile, drilling hole is carried out on the rock test piece to form a hole, and a simulating shaft is manufactured and formed in the hole;the rock test piece is heated to enable the rock test piece to reach preset temperature of simulating geotherm; the rock test piece reaching the preset temperature of the simulating geotherm is mounted into the confining pressure device, and preset confining pressure and preset gap pressure is applied to the rock test piece through the confining pressure device; and liquid nitrogen fracturing liquid is injected into the hole of the rock test piece, when pressure of the liquid nitrogen fracturing liquid reaches a preset condition, the liquid nitrogen fracturing liquid is stopped to be injectedand the confining pressure is discharged. According to the experimental method and device for the application of liquid nitrogen fracturing in the geothermal development, fracturing of rock nearby thegeotherm by adopting the liquid nitrogen can be simulated to study the damage condition of rock nearby the geotherm by thermal stress induced by ultra-low temperature.
Description
technical field [0001] The invention relates to the technical field of geothermal resource development, in particular to an experimental method and an experimental device for applying liquid nitrogen fracturing to geothermal development. Background technique [0002] Geothermal energy is the heat generated inside the earth and stored under the surface. Geothermal energy has become one of the important alternative energy sources after coal and petroleum. It is an important member of new energy fields such as solar energy, wind energy, and biomass energy. It is a kind of Renewable clean green energy with no or minimal pollution. my country is a country rich in geothermal resources, especially the medium and low temperature geothermal resources with a temperature between 25°C and 150°C are almost all over the country. The development and utilization of geothermal resources is booming, especially after the 1990s, there is a great market demand, and it is widely used in various ...
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IPC IPC(8): E21B43/26E21B49/00
CPCE21B43/26E21B49/00
Inventor 张广清林灿坤赵波
Owner CHINA UNIV OF PETROLEUM (BEIJING)