Method and apparatus for the removal of sand in an underwater well
US6158512A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 13, 1998 |
| Grant date | Dec 12, 2000 |
| Priority date | — |
| Expiry date | May 13, 2018 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B37/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A sand removing apparatus which is intended to be used in the lower area of underwater wells and is suspended from the end of a pipe string, includes a container having a closeable inlet for allowing a flow of liquid accompanied by sand thereinto. The container has a separate outlet assigned a suction side of a pump constituting the drive device for the apparatus. The drive device is kept going until a degree of filling of the container has been achieved. Between a separate inlet provided with a one-way valve and the separate outlet, a filter is disposed, so that sand remains in the container while the carrier liquid exits the container. In one embodiment, the drive device is a liquid-driven jet jump.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.