Drain hole drilling
US4444265A · kind A · utility
13Cited by
7References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 2, 1982 |
| Grant date | Apr 24, 1984 |
| Priority date | — |
| Expiry date | Sep 2, 2002 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/305
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for enhancing the recovery of liquid products from a wellbore having at least one laterally extending drain hole wellbore extending therefrom wherein a portion of the earth around the primary wellbore and a part of the drain hole wellbore is treated to render same essentially gas impermeable so that gas cannot prematurely cone into the primary wellbore, thereby enhancing the liquid recovery by way of the drain hole wellbore before gas reaches the drain hole wellbore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.