Casing-protective horizontal directional drilling coaxial coring device for geological investigation
US11525320B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 2021 |
| Grant date | Dec 13, 2022 |
| Priority date | — |
| Expiry date | Oct 24, 2041 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/1078
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A casing-protective horizontal directional drilling coaxial coring device for geological investigation includes a casing pipe, a coring tube and a conversion adapter. Both the casing pipe and the coring tube are tubular, and the coring tube is coaxially set within the casing pipe. The conversion adapter, having a cylindrical structure fitted with the casing pipe, is coaxially set at a back end portion of the casing pipe and is slidably connected with an inner wall of the casing pipe. A screw motor is located between the conversion adapter and the coring tube, two ends of the screw motor are fixedly connected with the conversion adapter and the coring tube, respectively. Under an action of an external force, the screw motor drives the coring tube to move along an axial direction of the casing pipe till the coring tube extends out of or retracts into the casing pipe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.