Gravity drainage startup using RF and solvent
US8978755B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 13, 2011 |
| Grant date | Mar 17, 2015 |
| Priority date | — |
| Expiry date | Nov 23, 2033 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/2408
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The method begins by forming a gravity drainage production well pair within a formation comprising an injection well and a production well. The pre-soaking stage begins by soaking at least one of the wellbores of the well pair with a solvent, wherein the solvent does not include water. The pre-heating stage begins by heating the soaked wellbore of the well pair to produce a vapor. The squeezing stage begins by introducing the vapor into the soaked wellbore of the well pair, and can thus overlap with the pre-heating stage. The gravity drainage production begins after the squeezing stage, once the wells are in thermal communication and the heavy oil can drain to the lower well.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.