Patent · US Expired

Drilling hole system for horizontal boreholes

US6050351A · kind A · utility

7Cited by

4References

8Claims

0Family size

Assignee

Gaz de France (G.D.F.) Service National Powerdrill GmbH Und Co KG · DE

Inventors

Josef Eckenfels · Durbach, DE
Herbert Haas · Aachen, DE
Norbert Prinz · Greven, DE
Christian Wartel · Paris, FR
Dominique Pfeiffer · Ermenonville, FR

Key dates

Filing date	Sep 3, 1997
Grant date	Apr 18, 2000
Priority date	—
Expiry date	Sep 3, 2017

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B7/046
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A drilled hole (1) is produced by means of a drilling rod assembly comprig a succession of rod elements (7d) to be arranged end to end. For this purpose, a vertical shaft (2) is produced in the ground, of constant horizontal section and preferably insufficient for a man to be able to work towards the bottom of it, the rod assembly is displaced therein from an opening located in a front wall of the shaft, and the elements (7) of the rod assembly are selected so that they have an axial length less than the distance separating the said opening in the front wall of the shaft from the opposite rear wall.

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