Long-distance core drilling method suitable for a horizontal geological core drilling rig
US11408239B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2021 |
| Grant date | Aug 9, 2022 |
| Priority date | — |
| Expiry date | Sep 27, 2041 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B25/16
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A long-distance core drilling method suitable for a horizontal geological core drilling rig. (1) An active drill rod is connected to a drill rod, which is connected to a wireline-coring outer-tube drilling tool. (2) A steel-pipe string is connected to a fishing device, and the fishing device is connected to a spearhead on a core tube, which is placed to a designated position through a pipe-feeding mechanism. (3) A washing pump is started. (4) A core drilling is carried out. (5) A core is pulled out. (6) The steel-pipe string and the fishing device are reconnected. (7) The core tube is salvaged. (8) The core tube and drill pipe are replaced. (9) A hole is swept. (10) Steps (1)-(9) are repeated until the hole is drilled to a designated depth. (11) The core tube and the wireline-coring outer-tube drilling tool are recovered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.