Hydrostatically powered fracturing sliding sleeve
US8739879B2 · kind B2 · utility
5Cited by
5References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 21, 2011 |
| Grant date | Jun 3, 2014 |
| Priority date | — |
| Expiry date | Aug 9, 2032 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/26
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A series of sliding sleeves is actuated by a single ball that lands on a first ball seat and shifts the ball seat. The shifting of the ball seat also allows tubing pressure to communicate to a formerly atmospheric chamber on one side of a piston integrated into the back side of the sliding sleeve. The other side of the piston remains at atmospheric pressure so that the shifting of the ball seat not only releases the ball to go to the next ball seat but also puts a net force on the sliding sleeve to shift it against a travel stop to open a port to allow fracturing, even if there is cement in the annulus around the opened port.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.