Title:
METHOD FOR INVERSION CALCULATION OF COAL SEAM GAS PARAMETERS BY RAPID MEASUREMENT WHILE DRILLING
Document Type and Number:
WIPO Patent Application WO/2020/258589
Kind Code:
A1
Abstract:
A method for the inversion calculation of coal seam gas parameters by rapid measurement while drilling, which relates to the technical field of coal mine geology and safety. Problems in which the number of coal seam gas parameters and outburst risk testing points is few, the measurement time is long, the process is complex, and coal seam gas and outburst risk actual distribution cannot be comprehensively and accurately reflected are solved. The technical solution thereof is: the method for the inversion calculation of coal seam gas parameters by rapid measurement while drilling, which comprises: when drilling in a coal seam, the orifice gas flow amount and the gas concentration are measured in real time while drilling, the orifice drilling gas emission amount is calculated, the coal seam gas pressure at a drill bit is calculated by inversion on the basis of drilling parameters and coal seam permeability parameters, and the coal seam gas content is calculated according to the relational expression between the gas content and the gas pressure. The described method does not take up time for drilling and replacing drill rods, and is accurate, convenient, in real-time and rapid, and may measure and calculate coal seam gas parameters in all sections of the full drilling length.
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Inventors:
WANG ENYUAN (CN)
WANG HAO (CN)
OU JIANCHUN (CN)
SHEN RONGXI (CN)
WANG XIYUAN (CN)
LI BAOLIN (CN)
LI ZHONGHUI (CN)
LIU XIAOFEI (CN)
WANG HAO (CN)
OU JIANCHUN (CN)
SHEN RONGXI (CN)
WANG XIYUAN (CN)
LI BAOLIN (CN)
LI ZHONGHUI (CN)
LIU XIAOFEI (CN)
Application Number:
PCT/CN2019/110750
Publication Date:
December 30, 2020
Filing Date:
October 12, 2019
Export Citation:
Assignee:
UNIV CHINA MINING (CN)
XUZHOU FUAN TECH CO LTD (CN)
XUZHOU FUAN TECH CO LTD (CN)
International Classes:
E21B47/06; E21B47/01; E21F7/00; G06Q50/02
Foreign References:
| CN107448188A | 2017-12-08 | |||
| CN101975075A | 2011-02-16 | |||
| CN106680451A | 2017-05-17 | |||
| CN106401557A | 2017-02-15 | |||
| CN107807412A | 2018-03-16 | |||
| CN109709297A | 2019-05-03 | |||
| US20030196484A1 | 2003-10-23 | |||
| SU1149025A1 | 1985-04-07 |
Attorney, Agent or Firm:
NANJING JINGWEI PATENT & TRADEMARK AGENCY CO., LTD (CN)
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