Cam mechanism for downhole rotary valve actuation and a method for drilling
US8936099B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 3, 2011 |
| Grant date | Jan 20, 2015 |
| Priority date | — |
| Expiry date | Nov 20, 2032 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/0421
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A downhole tool including a cam housing disposed in a central bore of a sub; a cam piston having a cam track disposed in the cam housing; a rotary piston having a rotary valve and an auxiliary track disposed in the cam housing; a guide pin extending through the cam housing into the cam track having at least two return paths; and a position pin disposed on a cam flange and extending into the auxiliary track. Also, a method of actuating a downhole tool, the method including disposing the downhole tool in a wellbore, wherein the downhole tool comprises a cam piston and a rotary piston; providing a flow of fluid through a central bore of the downhole tool at a working flow rate; changing the flow of fluid through the central bore of the downhole tool to a trigger range, and rotating a rotary valve of the rotary piston.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.