Wellbore pressure differential control for gravel pack screen
US5234055A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 10, 1993 |
| Grant date | Aug 10, 1993 |
| Priority date | — |
| Expiry date | Oct 10, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Under-balanced or potential fluid cross-flow conditions in a wellbore are minimized during installation of an auger-type gravel pack screen by placing a quantity of fine salt, calcium carbonate paste, a fluid loss control gel or sand within the interior space of the screen liner so that the material will form a substantially impermeable barrier on the liner, the gravel packing or the face of the formation during or after installation of the screen to minimize fluid flow in wells which have a relatively high pressure gradient. The material may be removed at will by circulation of a dissolving liquid such as fresh or unsaturated water or mechanical removal of insoluble material such as sand.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.