Measurement-while-drilling method and device for obtaining coal seam gas parameter
US11268377B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 2017 |
| Grant date | Mar 8, 2022 |
| Priority date | — |
| Expiry date | Feb 20, 2038 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/26
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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 …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.