Fracturing method providing simultaneous flow back
US7278486B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2005 |
| Grant date | Oct 9, 2007 |
| Priority date | — |
| Expiry date | Oct 6, 2025 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/14
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A bottom-up method of fracturing a multi-zone subterranean formation intersected by a wellbore that enables one zone to be fractured while at the same time flowing previously placed fracture fluid from one or more other zones back to the surface is provided. The method employs a bottom-hole assembly (“BHA”) that is attached to the bottom end of a tubing string. The BHA includes a hydra jetting sub, a centralizer, a packer and valve sub. The hydra jetting sub is used to perforate and initiate the fracture in the zones of interest. The zones are fractured by pumping fracturing fluid down the annulus formed between the tubing string and the wellbore. The previously placed fracture fluid flows back to the surface through the tubing string. It enters through the valve sub in the BHA.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.