Method for constructing networked preferential gas migration pathways and diverting and extracting gas
US10487656B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 2017 |
| Grant date | Nov 26, 2019 |
| Priority date | — |
| Expiry date | Dec 1, 2037 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/263
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for constructing networked preferential gas migration pathways and diverting and extracting gas. The method proposes that a fracture generation hole, a fracture guidance and development hole, a lateral rupture hole, and a fracture connection hole are respectively constructed in a roof in roadways on two sides of a working face in advance of an advance stress change area. Artificial guided fractures are actively constructed and formed inside the hard roof. Under a mining-induced stress effect, the artificial guided fractures and mining-induced fractures intersect with and are connected to each other to form networked preferential gas migration pathways. Meanwhile, boreholes for artificial guided fractures accelerate roof fracturing to form a rupture bed separation fracture area in a roof. Gas flows and migrates in a timely and efficient manner along networked fracture pathways and concentrates in the rupture bed separation fracture area in the roof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.