Title (en)

CORE-DRILLING TOOL

Publication

EP 0338367 A3 19910327 (DE)

Application

EP 89106285 A 19890410

Priority

DE 3813508 A 19880422

Abstract (en)

[origin: EP0338367A2] The core-drilling tool for rock bores in underground soil formations comprises an outer tube (6) which can be connected at its top end via attachment means to the bottom end of a drill-pipe string (3), which can be set in drive rotation, and at its bottom end to a core-drilling bit (7), and an inner tube (8) which forms a construction unit which can be conveyed separately to the surface and has a support part (18), which is supported in the outer tube (6) in such a way that it rotates with the latter, as well as a core-tube part (20) for receiving a bored core, which core-tube part (20) is suspended on the support part (18) by means of a bearing arrangement in such a way as to locked against rotation relative to the outer tube (6). Here, the core-tube part (20) is provided with a measuring unit (10), arranged in its upper area, for recording, processing and storing data from the working face, which data form drill-hole, drilling-core and/or drilling-process parameters.

IPC 1-7

E21B 25/02; E21B 47/00; E21B 47/12

IPC 8 full level

E21B 25/02 (2006.01); E21B 25/16 (2006.01); E21B 47/00 (2012.01); E21B 47/01 (2012.01); E21B 47/12 (2012.01)

CPC (source: EP US)

E21B 25/02 (2013.01 - EP US); E21B 25/16 (2013.01 - EP US); E21B 47/013 (2020.05 - EP US); E21B 47/26 (2020.05 - EP US)

Citation (search report)

• [X] GB 2188352 A 19870930 - BRITISH PETROLEUM CO PLC
• [Y] GB 1433265 A 19760422 - MCCULLOGH I J
• [YD] US 4499955 A 19850219 - CAMPBELL FRANK L [US], et al
• [Y] US 4400858 A 19830830 - GOIFFON JOHN J [US], et al
• [Y] US RE32336 E 19870127
• [A] US 2820610 A 19580121 - MARTINEZ JOSEPH D
• [AD] US 4161782 A 19790717 - MCCRACKEN OLIVER W [US]
• [A] US 4778402 A 19881018 - SCHOEPF VICTOR L [US]
• [A] EP 0253473 A2 19880120 - DIAMANT BOART LTD [GB]
• [A] US 2670179 A 19540223 - NATLAND MANLEY L, et al
• [A] GB 1096388 A 19671229 - TEXACO DEVELOPMENT CORP

Designated contracting state (EPC)

BE FR GB NL

DOCDB simple family (publication)

EP 0338367 A2 19891025; EP 0338367 A3 19910327; CA 1327035 C 19940215; DE 3813508 C1 19891012; NO 891657 D0 19890421; NO 891657 L 19891023; US 4955438 A 19900911

DOCDB simple family (application)

EP 89106285 A 19890410; CA 597533 A 19890424; DE 3813508 A 19880422; NO 891657 A 19890421; US 34192889 A 19890421