Simulation experiment device used for enhanced geothermal system and method for evaluating porous sandstone geothermal reservoir reconstruction by means of simulation experiment device

A simulation experiment device, enhanced technology, applied in geothermal energy prediction/simulation, heating device, heat collector using groundwater as working fluid, etc.

Active Publication Date: 2017-05-17
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a simulation experiment device for enhanced geothermal system and a method for evaluating porous sandstone heat storage transformation by using it, and solves how to carry out under different well types, different well patterns, different well spacing, and diffe

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  • Simulation experiment device used for enhanced geothermal system and method for evaluating porous sandstone geothermal reservoir reconstruction by means of simulation experiment device
  • Simulation experiment device used for enhanced geothermal system and method for evaluating porous sandstone geothermal reservoir reconstruction by means of simulation experiment device
  • Simulation experiment device used for enhanced geothermal system and method for evaluating porous sandstone geothermal reservoir reconstruction by means of simulation experiment device

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Effect test

Embodiment approach 1

[0047] figure 1 It is a structural schematic diagram of a simulation experiment device for an enhanced geothermal system in a preferred embodiment of the application; please refer to figure 1 , the simulation experiment device 100 includes a heat exchange chamber 1, a prefabricated rock block 2, an electric heating plate 3, a constant temperature liquid supply tank 4, two liquid collection tanks 5, a high-pressure plunger pump 6 and a horizontal ground stress simulation device 7.

[0048] The heat exchange chamber 1 is used to provide a closed working space for the simulation experiment device 100. Specifically, the heat exchange chamber 1 forms a closed chamber; The inlet is provided corresponding to the outlet, both the inlet and the outlet are in communication with the chamber, and the number of the outlets is two.

[0049] The prefabricated rock block 2 is placed in the chamber, and an injection wellbore 21, a first production wellbore 22 and a second production wellbore ...

Embodiment 1

[0079] This example studies the influence of well spacing on the development effect of thermal storage when the development mode of porous sandstone thermal storage is a horizontal well with one injection and two productions, and the thermal storage transformation method is horizontal well staged fracturing (two fractures). The development effect includes the spatial distribution of temperature and pressure in rock blocks during development, the spatial distribution of temperature and pressure in fractures, heat extraction efficiency, and the temperature recovery of rock blocks and fractures after a period of heat storage development.

[0080] S1. Prefabricate the wellbore in the rock block according to the well type in the porous sandstone heat storage. The wellbore is made of iron pipe and hard plastic pipe; the iron pipe is 45cm long and the inner diameter is 2cm. The length of the pipe is 40cm, and the outer diameter is 2cm. A large area of ​​holes is dug on the hard plasti...

Embodiment 2

[0088] In this example, the development mode of porous sandstone thermal storage is a horizontal well with one injection and two production, and the thermal storage reconstruction method of horizontal well staged fracturing is used. The development effect includes the spatial distribution of temperature and pressure in rock blocks during development, the spatial distribution of temperature and pressure in fractures, heat extraction efficiency, and the temperature recovery of rock blocks and fractures after a period of heat storage development.

[0089] S1. Prefabricate the wellbore in the rock block according to the well type in the porous sandstone heat storage. The wellbore is made of iron pipe and hard plastic pipe; the iron pipe is 45cm long and the inner diameter is 2cm. The length of the pipe part is 60cm, and the outer diameter is 2cm. A large area of ​​holes is dug on the hard plastic pipe wall to simulate the completion of the open hole. The hard plastic pipe is insert...

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Abstract

The invention discloses a simulation experiment device used for an enhanced geothermal system and a method for evaluating porous sandstone geothermal reconstruction by means of the simulation experiment device. The simulation experiment device comprises a heat exchanger chamber, a prefabricated rock, an electric heating panel, a constant-temperature liquid supply groove, two liquid colleting grooves and horizontal geostress simulation units, wherein an inlet and two outlets corresponding to the inlet are formed in the heat exchange chamber, and the inlet and the outlets all communicate with a cavity; and the prefabricated rock is arranged in the cavity, a first injection shaft, a first production shaft and a second production shaft are further arranged in the prefabricated rock, the injection shaft is located between the first production shaft and the second production shaft, the injection shaft communicates with the inlet, the first production shaft and the second production shaft communicate with the two outlets correspondingly, and preset seams, micro pressure sensors and micro temperature sensors are arranged in the prefabricated rock.

Description

technical field [0001] The invention relates to the field of geothermal technology, in particular to a simulation experiment device for an enhanced geothermal system and a method for evaluating the reformation of porous sandstone heat storage using the same. Background technique [0002] Fossil energy is a kind of hydrocarbon or its derivatives. Fossil energy is currently the most important energy consumed in the world. However, the environmental problems caused by the use of traditional fossil energy are becoming more and more serious, even threatening human health and the living environment. Therefore, it is very important to strengthen the development and utilization of renewable clean energy. [0003] Among them, compared with solar energy and wind energy, geothermal energy has the advantages of being unaffected by weather, stable, and rich in resources. At the same time, geothermal resources are divided into low-temperature thermal storage (less than 90°C) and medium-te...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B47/06E21B47/07E21B43/26F24J3/08
CPCE21B43/26E21B47/06E21B49/00F24T10/20F24T2201/00E21B47/07Y02E10/10
Inventor 郭天魁张伟曲占庆孙江巩法成田雨李小龙
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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