EP 0380909 A3 19920311 - METHOD AND CORING APPARATUS FOR SUBTERRANEAN ROCK DRILLING
Title (en)
METHOD AND CORING APPARATUS FOR SUBTERRANEAN ROCK DRILLING
Publication
Application
Priority
DE 3902869 A 19890201
Abstract (en)
[origin: CA2008975A1] The present invention comprises a novel method and apparatus for sinking drill holes in underground rock formations while generating drill cores as rock samples. More particularly, the present invention discloses a method and apparatus which allows for an expanded analysis of ground formations over a larger area through the extraction of drill cores as rock samples. The method and apparatus herein disclosed allows one to drill a number of core shaft sections from the base of a main shaft section in various directions in order to obtain a number of sample cores.
IPC 1-7
IPC 8 full level
E21B 4/02 (2006.01); E21B 7/06 (2006.01); E21B 25/04 (2006.01); E21B 25/16 (2006.01)
CPC (source: EP US)
E21B 4/02 (2013.01 - EP US); E21B 7/061 (2013.01 - EP US); E21B 7/068 (2013.01 - EP US); E21B 25/04 (2013.01 - EP US); E21B 25/16 (2013.01 - EP US)
Citation (search report)
- [YD] EP 0276724 A2 19880803 - EASTMAN CHRISTENSEN CO [US]
- [Y] DE 568941 C 19330126 - BATAAFSCHE PETROLEUM
- [A] US 2571644 A 19511016 - ZUBLIN JOHN A
- [A] DE 1181149 B 19641112 - SVENSKA DIAMANTBERGBORRNINGS A
- [A] DE 1094687 B 19601215 - TIEFBOHR MESS DIENST LEUTERT U
Designated contracting state (EPC)
BE FR GB NL
DOCDB simple family (publication)
DE 3902869 C1 19900412; CA 2008975 A1 19900801; EP 0380909 A2 19900808; EP 0380909 A3 19920311; NO 900458 D0 19900131; NO 900458 L 19900802; US 5029653 A 19910709; US 5052502 A 19911001
DOCDB simple family (application)
DE 3902869 A 19890201; CA 2008975 A 19900131; EP 90100111 A 19900104; NO 900458 A 19900131; US 47288590 A 19900131; US 66049091 A 19910225