Experimental method and device for application of liquid nitrogen fracturing in geothermal development

An experimental method and experimental device technology, applied in the field of geothermal resource development, can solve problems such as lack, and achieve the effects of increasing diversion capacity, improving geothermal recovery rate, and increasing contact area

Active Publication Date: 2019-03-01
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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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, especiall...

Method used

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  • Experimental method and device for application of liquid nitrogen fracturing in geothermal development
  • Experimental method and device for application of liquid nitrogen fracturing in geothermal development
  • Experimental method and device for application of liquid nitrogen fracturing in geothermal development

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Embodiment Construction

[0031] The details of the present invention can be understood more clearly in combination with the drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used to explain the purpose of the present invention, and cannot be construed as limiting the present invention in any way. Under the teaching of the present invention, the skilled person can conceive any possible modifications 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 a central element may also exist. When an element is considered to be "connected" to another element, it can be directly connected to the other element or an intermediate element may be present at the same time. The terms "installation", "connec...

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Abstract

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 below the surface. Geothermal energy has become one of the important alternative energy sources after coal and petroleum. It is an important member in the fields of new energy such as solar energy, wind energy, and biomass energy. Renewable clean green energy with no pollution or very little pollution. my country is a country rich in geothermal resources, especially the low- and medium-temperature geothermal resources with a temperature between 25°C and 150°C almost all over the country. The development and utilization of geothermal resources is booming, especially after the 1990s, it has a great market demand. It is widely used in power generation,...

Claims

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Application Information

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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)
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