公开(公告)号：US10947842B2

公开(公告)日：2021-03-16

申请号：US16615013

申请日：2017-11-27

Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY

Inventor： Enyuan Wang ,  Zhonghui Li ,  Jianchun Ou ,  Liming Qiu

IPC: E21B49/00 ,  E21B47/07 ,  E21B47/024 ,  E21B47/06 ,  E21B47/10 ,  E21B47/14 ,  E21B49/08 ,  G01V1/46 ,  G01V1/52 ,  E21B7/00 ,  E21B33/124 ,  E21B33/127 ,  G01V3/38 ,  G01V3/26 ,  G01V1/50 ,  G01V11/00 ,  E21B47/02 ,  E21B47/00

Abstract: A measurement-while-drilling method and device assesses outburst risk and evaluates gas drainage performance of a coal seam. The device includes a compartment, a pressure sensor, a temperature sensor, a flow sensor, an electromagnetic sensor, an acoustic sensor, a wave velocity measurement module, a monitoring and control module, a power supply and a communication interface. These are installed between a drill bit and an inclinometer or a first drill pipe. Measurements are performed while drilling to obtain a real time gas parameter, lithologic and coal seam information, for on-site assessment of outburst risk. During drill bit replacement, gas pressure, temperature, flow velocity, wave velocity, electromagnetic radiation, and an acoustic signal are recorded in real time, to calculate stress of the coal seam and coal seam outburst risk. On-site measurement is done while drilling without sampling and can use multiple parameters to perform synchronous measurement to obtain a comprehensive evaluation.

公开(公告)号：US11268377B2

公开(公告)日：2022-03-08

申请号：US16618171

申请日：2017-11-27

Applicant: CHINA UNIVERSITY OF MINING AND TECHNOLOGY

Inventor： Enyuan Wang ,  Zhonghui Li ,  Jianchun Ou ,  Liming Qiu

IPC: E21B47/14 ,  E21B47/07 ,  E21B47/26

Abstract: Disclosed are a measurement-while-drilling method and device for obtaining a coal seam gas parameter applicable to measurement of a coal seam gas/coal seam methane parameter while drilling and evaluation of gas drainage performance. The invention performs a measurement-while-drilling operation to obtain information about downhole gas and a coal seam, thereby realizing on-site measurement of a coal seam gas parameter while drilling. The measurement-while-drilling device for obtaining a coal seam gas parameter comprises a compartment (17), a pressure sensor (15), a temperature sensor (14), a flow sensor (4), an acoustic emission sensor (16), a monitoring and control module (11), a power module and a communication module. The device is installed between a drill bit (1) and a first drill pipe (20). The method comprises: in a drilling process, using the temperature sensor (14) to monitor, in real time, a temperature at a spot under measurement; when drilling stops, sealing a borehole to form a pressure measurement cavity, and using the pressure sensor (15) to monitor a gas pressure in real time; after completion of the pressure measurement, using the flow sensor (4) to monitor, in real time, an amount of gas emitted from the borehole; and performing comprehensive calculation to obtain a gas pressure, a gas content, and an amount of initially desorbed gas at the spot of the coal seam. The invention can perform on-site measurement while drilling and calculate to obtain a coal seam gas/coal seam methane parameter, can perform on-site measurement while drilling without sampling, and can use multiple parameters to perform synchronous measurement.