Title:
TEST SYSTEM AND METHOD FOR LIQUID NITROGEN CIRCLE FREEZE-THAWING PERMEABILITY-INCREASING SIMULATION OF COAL ROCK SAMPLE
Document Type and Number:
WIPO Patent Application WO/2017/016168
Kind Code:
A1
Abstract:
A test system and method for liquid nitrogen circle freeze-thawing permeability-increasing simulation of a coal rock sample. The test system comprises a freeze-thawing apparatus, a data collection system, and a coal rock sample. The freeze-thawing apparatus comprises a liquid nitrogen freeze-thawing test chamber (6) and a self-pressurizing liquid nitrogen tank (7). The coal rock sample (8) is placed in the liquid nitrogen freeze-thawing test chamber (6), and the liquid nitrogen freeze-thawing test chamber (6) is connected to the self-pressurizing liquid nitrogen tank (7) by using a liquid nitrogen supply pipeline. The liquid nitrogen supply pipeline comprises a three-way connector (612), and the three-way connector (612) is respectively connected to the liquid nitrogen freeze-thawing test chamber (6), the self-pressurizing liquid nitrogen tank (7), and a liquid nitrogen pressurizing tube (610). The data collection system comprises a high-frequency pressure sensor (3), a low-temperature strain gauge (41), and a temperature sensor probe (51). The test method repeats the liquid nitrogen freeze-thawing circle for many times, to investigate influence rules on the strain and temperature of a coal rock sample (8) under different freeze-thawing variable conditions. The test method can simulate a process of permeability increase of coal body or rock body through liquid nitrogen circle freeze thawing, and provide a realizable test platform to gas or shale gas extraction from coal rock body with permeability increase by the liquid nitrogen circulation freeze thawing.
Inventors:
ZHAI CHENG (CN)
QIN LEI (CN)
XU JIZHAO (CN)
TANG ZONGQING (CN)
WU SHILIANG (CN)
ZHONG CHAO (CN)
QIN LEI (CN)
XU JIZHAO (CN)
TANG ZONGQING (CN)
WU SHILIANG (CN)
ZHONG CHAO (CN)
Application Number:
PCT/CN2015/099319
Publication Date:
February 02, 2017
Filing Date:
December 29, 2015
Export Citation:
Assignee:
UNIV CHINA MINING & TECH (CN)
International Classes:
G01N25/00
Foreign References:
| CN105136837A | 2015-12-09 | |||
| CN104677778A | 2015-06-03 | |||
| CN104655806A | 2015-05-27 | |||
| CN102507865A | 2012-06-20 | |||
| CN104297069A | 2015-01-21 | |||
| CN101487835A | 2009-07-22 | |||
| SU583319A1 | 1977-12-05 |
Attorney, Agent or Firm:
JW IP LAW FIRM (CN)
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