Patent · US Expired

Method and apparatus for downlink communication

US7518950B2 · kind B2 · utility

13Cited by

75References

22Claims

0Family size

Assignee

Baker Hughes Holdings LLC · US

Inventors

Joachim Treviranus · Winsen (Aller), DE
Henning Doerge · Hanstedt, DE
Marc Kurella · Braunschweig, DE

Key dates

Filing date	Mar 22, 2006
Grant date	Apr 14, 2009
Priority date	—
Expiry date	Mar 22, 2026

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B47/18
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

The present invention provides a method and system in which signals from the surface are sent by changing flow rate of the drilling fluid supplied to the drill string during drilling of a wellbore. The signals are sent based on a fixed or dynamic time period schemes so that the sent signals cross a threshold value in a known manner. A detector measures the changes in the flow rate. A controller downhole determines the number of times a downhole parameter, such as voltage, relating to the changes in the flow rate crosses a predefined threshold value. Based on the number of the crossings and the timing of such crossings, signals are assigned to commands. The controller controls or operates a steering device based on the commands.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.