EP 0958446 A2 19991124 - METHOD AND DEVICE FOR DRIVING BORE-HOLES, SPECIALLY FOR PROSPECTION AND EXTRACTION DRILLINGS
Title (en)
METHOD AND DEVICE FOR DRIVING BORE-HOLES, SPECIALLY FOR PROSPECTION AND EXTRACTION DRILLINGS
Title (de)
VERFAHREN UND VORRICHTUNG ZUM NIEDERBRINGEN VON BOHRLÖCHERN, INSBESONDERE FÜR SCHÜRF- UND GEWINNUNGSBOHRUNGEN
Title (fr)
PROCEDE ET DISPOSITIF POUR FORER DES SONDAGES, NOTAMMENT DES SONDAGES DE RECHERCHE ET D'EXTRACTION
Publication
Application
Priority
- DE 9702754 W 19971125
- DE 19702983 A 19970128
Abstract (en)
[origin: DE19702983C1] A new method sinks boreholes, especially for exploration and production. The drill string (5) carries a combination head (10) comprising cutter(s) (29) and a guide tip. The cutting head can be raised, retracting it from the guide tip (22). It can also be lowered into a working position, level with the end of the tip (21) or even projecting beyond it. Drilling commences with the cutter retracted until the guide tip, working in the ground, locates and positions the end of the drill string. The cutters are then lowered relative to the tip, to make the bore, especially in hard ground. Also claimed is the corresponding drilling equipment.
IPC 1-7
E21B 7/28; E21B 10/26; E21B 10/62; E21B 7/128; E21B 7/124; E21B 4/16; E21B 4/02; E21B 4/04; E21B 43/29; E21C 50/00
IPC 8 full level
E21B 4/02 (2006.01); E21B 4/04 (2006.01); E21B 4/16 (2006.01); E21B 7/124 (2006.01); E21B 7/128 (2006.01); E21B 7/28 (2006.01); E21B 10/26 (2006.01); E21B 10/62 (2006.01); E21B 43/29 (2006.01); E21C 50/00 (2006.01)
CPC (source: EP KR US)
E21B 4/02 (2013.01 - EP US); E21B 4/04 (2013.01 - EP US); E21B 4/16 (2013.01 - EP US); E21B 7/122 (2013.01 - EP KR US); E21B 7/124 (2013.01 - EP US); E21B 7/128 (2013.01 - EP US); E21B 7/28 (2013.01 - EP KR US); E21B 10/62 (2013.01 - EP US); E21B 43/29 (2013.01 - EP US)
Citation (search report)
See references of WO 9832951A2
Designated contracting state (EPC)
DE GB IT SE
DOCDB simple family (publication)
DE 19702983 C1 19980604; AU 5476898 A 19980818; AU 716089 B2 20000217; DE 59709874 D1 20030522; EP 0958446 A2 19991124; EP 0958446 B1 20030416; HK 1021011 A1 20000526; JP 2000511250 A 20000829; JP 3302700 B2 20020715; KR 100325792 B1 20020225; KR 20000070517 A 20001125; US 6484820 B1 20021126; WO 9832951 A2 19980730; WO 9832951 A3 19981001; ZA 98657 B 19980805
DOCDB simple family (application)
DE 19702983 A 19970128; AU 5476898 A 19971125; DE 59709874 T 19971125; DE 9702754 W 19971125; EP 97951093 A 19971125; HK 99105863 A 19991214; JP 53146698 A 19971125; KR 19997006761 A 19990727; US 35535499 A 19990927; ZA 98657 A 19980127