Method for directional drilling

US5937954A · kind A · utility

Assignee

• Tracto-Technik Paul Schmidt Spezialmaschinen · DE

Inventors

• Franz-Josef Puttmann · Lennestadt, DE
• Alfons Hesse · Lennestadt, DE

Key dates

• Filing date: Mar 25, 1997
• Grant date: Aug 17, 1999
• Expiry date: Mar 25, 2017

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B7/068
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

In a method for directional drilling with the aid of a drilling device having a drill pipe and a mining tool which moves on an orbit, the tool moves at an essentially constant angular velocity during straight drilling and the angular velocity is periodically changed during curved drilling, in order to thus create a smooth transition from straight drilling to curved drilling and to achieve more precise curve control.