Pressure switch for selective firing of perforating guns
US9752421B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2016 |
| Grant date | Sep 5, 2017 |
| Priority date | — |
| Expiry date | Jan 27, 2036 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/11852
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A switch includes a casing having a bore, a piston assembly having a first end and an exposed end, a plurality of flanges formed at the first end; an insulating sleeve enclosing the first end, a contact assembly disposed in the casing bore; a pin disposed in the bore; a predetermined quantity of lubricant deposited in the bore; and a spring urging the pin into engagement with the piston assembly. The insulating sleeve and the plurality of flanges are at least partially disposed in the casing bore. The pin has: (i) a first position wherein the pin electrically contacts the piston assembly and is electrically isolated from the contact assembly; and (ii) a second position wherein the pin is electrically isolated from the piston assembly and electrically engages the contact assembly. The predetermined quantity of lubricant may be approximately 0.3 grams.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.