Inversion calculation method of coal-bed gas parameters of fast test while-drilling
US11174722B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 12, 2019 |
| Grant date | Nov 16, 2021 |
| Priority date | — |
| Expiry date | Oct 12, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06Q50/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention provides an inversion calculation method of coal-bed gas parameters of fast test while-drilling. The technical solution is that an inversion calculation method of coal-bed gas parameters of fast test while-drilling includes: during drilling in a coal bed, testing a gas flow and a gas concentration of an orifice in real time while-drilling, calculating drilling gas discharge amounts of the orifice, inversely calculating a coal-bed gas pressure at a drill bit based on borehole and coal-bed permeability parameters, and calculating a coal-bed gas content according to a gas content and gas pressure relational expression. The present invention has the beneficial effects that the present invention does not occupy the drilling and drill rod replacement time, is accurate, convenient, real-time and fast, and can test and calculate the coal-bed gas parameters of each section along the whole borehole length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.