Apparatus and method for isolating flow in a downhole tool assembly
US9353597B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 2012 |
| Grant date | May 31, 2016 |
| Priority date | — |
| Expiry date | Oct 11, 2033 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/114
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus for isolating fluid flow in a bottomhole tool assembly comprises a generally cylindrically shaped flow tube with a side, a top, and a bottom; an upper ball seat connected to the top of the flow tube; a lower ball seat connected to the bottom of the flow tube; a plurality of openings in the side of the flow tube; a tapered inner diameter in the upper ball seat, acting as a ball valve; a tapered inner diameter in the lower ball seat, acting as a ball valve, smaller than the tapered inner diameter in the upper ball seat; an upper sub attached to the bottomhole tool assembly; a lower sub attached to the bottomhole tool assembly; shear pins connecting the upper ball seat to the upper sub; and a limiting pin in the lower sub below the lower ball assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.