Method of signaling passage of objects using tattle-tale apparatus
US9683437B2 · kind B2 · utility
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11Claims
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Key dates
| Filing date | Sep 10, 2014 |
| Grant date | Jun 20, 2017 |
| Priority date | — |
| Expiry date | Sep 26, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/09
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An electro-mechanical indicator system for signaling when a droppable object (such as, for example, a dart, plug or ball) is released during well cementing operations. A body section has first and second chambers divided by a fluid and pressure sealing barrier. A mechanical trigger mechanism is situated in the first chamber, which is exposed to elevated pressures and harsh wellbore fluids. Less robust components, such as sensor(s), power source(s), and signal device(s) located in the second chamber, remain isolated from the wellbore environment and elevated pressures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.