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Test method for crack communication evaluation and heat extraction test of enhanced geothermal system

A test method, enhanced technology, used in the application of stable tension/pressure to test material strength, measuring devices, teaching models, etc.

Active Publication Date: 2020-01-07
SHANDONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a test method for fracture communication evaluation and heat extraction test of enhanced geothermal system, which solves the technical problem of fracture communication evaluation and heat extraction test of injection-production system formed under different fracturing modes, and realizes The integrated technical effect of fracture shape monitoring, injection-production system communication evaluation and heat extraction performance test under different fracturing modes

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  • Test method for crack communication evaluation and heat extraction test of enhanced geothermal system
  • Test method for crack communication evaluation and heat extraction test of enhanced geothermal system
  • Test method for crack communication evaluation and heat extraction test of enhanced geothermal system

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Experimental program
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Effect test

Embodiment 1

[0046] Embodiment 1 The first mode is used for fracturing, that is, fracturing is performed from one of the first fracturing fluid inlet 4 and the second fracturing fluid inlet 5, and the fractures generated by fracturing from the fracturing fluid inlet are observed In order to simplify the description, the fracturing from the first fracturing fluid inlet 4 is taken as an example for description below; the specific steps are:

[0047] Step 1: Test Preparation

[0048] Take a rock sample 2 of Group A rock sample and put it into figure 1 In the airtight cavity 1 shown, a thermocouple 3 in contact with the rock sample 2 is provided in the cavity 1 for heating the rock sample, and the left and right ends of the cavity 1 are respectively provided with fracturing fluids communicating with the cavity. The inlets are respectively referred to as the first fracturing fluid inlet 4 and the second fracturing fluid inlet 5; the inner ring of the chamber 1 is provided with a gasket to real...

Embodiment 2

[0057] Group B rock samples were taken for the test of Example 2, and Example 2 adopted the second fracturing mode, that is, fracturing from one fracturing fluid inlet, and then fracturing from another fracturing fluid inlet to observe the fracture shape; To simplify the description, first fracturing from the first fracturing fluid inlet 4 and then fracturing from the second fracturing fluid inlet 5 is taken as an example for description. The specific steps differ from the first embodiment only in the fracturing mode, which is specifically reflected in the third step.

[0058] Step 3: Wait until the temperature of the rock sample rises to the set temperature T rock and continue to keep warm for 12 hours, inject from the first fracturing fluid inlet 4 with a constant temperature of T inj The fracturing fluid was continuously loaded at a constant temperature during the injection process. When the injection pressure suddenly decreased and stabilized, the fracturing stimulation w...

Embodiment 3

[0060] Take group C rock samples for the test of Example 3. In Example 3, the third fracturing mode is adopted, that is, simultaneous fracturing from the first fracturing fluid inlet 4 and the second fracturing fluid inlet 5, and the fracture shape is observed. The specific steps It is basically the same as Embodiment 1, except that the fracturing mode of the third step is different, specifically:

[0061] After 12 hours of heat preservation, inject constant temperature from the first fracturing fluid inlet 4 and the second fracturing fluid inlet 5 at the same time inj The fracturing fluid was continuously loaded at constant temperature during the injection process, and the fracturing stimulation was stopped when the injection pressure suddenly dropped and stabilized, and the number of acoustic emission events was recorded; thus, the sample 2 was obtained in the third fracturing mode and the set temperature T rock Fractures formed by fracturing.

[0062] The present inventio...

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Abstract

The invention discloses a test method for crack communication evaluation and heat extraction test of an enhanced geothermal system. According to the method, a rock sample to be tested is placed into aclosed cavity with a fracturing fluid inlet, a triaxial fracturing test is carried out on a rock sample by adopting different fracturing modes, and fracturing transformation is carried out on the rock sample. The test method can be used to analyze communication conditions of cracks or crack networks formed under different fracturing modes to the injection well and the production well, and carry out thermal extraction test experiments, including the liquid production rate, the liquid production temperature and the heat collection rate of the enhanced geothermal system, on the fractured rock sample after fracturing transformation. In addition, influence of different crustal stress conditions, rock temperature, fracturing fluid, fracturing displacement, rock sample lithology and the like onfracturing transformation effect and influence of communication and heat extraction performance of cracks on an injection-production system can be discussed.

Description

technical field [0001] The invention relates to the process of fracturing reconstruction and heat extraction of an enhanced geothermal system, and in particular to a test device and method for communication and evaluation of fracturing fractures of an enhanced geothermal system to an injection-production system and heat extraction after fracturing. Background technique [0002] Hot dry rock reservoirs are rich in geothermal energy, but their low porosity and low permeability make it difficult to effectively utilize the high temperature energy. Creating fractures or re-opening the original natural fractures in thermal reservoirs by artificial fracturing technology to form an enhanced geothermal system provides the possibility for the efficient development of hot dry rocks. However, the effective extraction of energy from hot dry rocks not only requires the creation of fractures or fracture networks in the reservoir, but also the effective communication between the injection s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12G01N3/18G01N23/046G01N29/14G09B23/40
CPCG01N3/12G01N3/18G01N23/046G01N29/14G01N2203/0019G01N2203/0048G09B23/40
Inventor 王春光张伟陈绍杰范坤坤胡松涛宋维强沈宝堂
Owner SHANDONG UNIV OF SCI & TECH
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