EP 0907820 B1 20040102 - DRILL TUBE FOR FORMING DRILL STRINGS
Title (en)
DRILL TUBE FOR FORMING DRILL STRINGS
Title (de)
BOHRROHR FÜR BOHRGESTÄNGE
Title (fr)
TUBE DE FORAGE DESTINE A LA FORMATION DE TRAINS DE TIGES
Publication
Application
Priority
- SE 9701085 W 19970618
- SE 9602472 A 19960624
Abstract (en)
[origin: WO9749891A1] In a first aspect the invention relates to a drill-string-forming drill tube which includes a channel (15) intended for passing flushing liquid, inside of which there is a restriction which forms a seat (14) for a valve body (16) serving as a check valve. Said drill tube comprises, in addition to a partly spherical skittle member (17) for engagement in the seat (14), two or more tangentially separated blocking elements (21). The purpose of said elements is, when flushing liquid is fed from the valve seat towards a second restriction distanced therefrom, to stop the valve body against said second restriction without sealing thereagainst. Therefore, one and the same drill tube may be used for upwardly directed as well as downwardly directed drilling. In a second aspect, the invention relates to the valve body as such.
IPC 1-7
IPC 8 full level
E21B 21/10 (2006.01)
CPC (source: EP)
E21B 21/10 (2013.01)
Designated contracting state (EPC)
AT DE FI FR GB IE SE
DOCDB simple family (publication)
WO 9749891 A1 19971231; AT E257214 T1 20040115; AU 3282197 A 19980114; AU 712137 B2 19991028; DE 69727056 D1 20040205; EP 0907820 A1 19990414; EP 0907820 B1 20040102; SE 506855 C2 19980216; SE 9602472 D0 19960624; SE 9602472 L 19971225; ZA 975507 B 19980123
DOCDB simple family (application)
SE 9701085 W 19970618; AT 97928611 T 19970618; AU 3282197 A 19970618; DE 69727056 T 19970618; EP 97928611 A 19970618; SE 9602472 A 19960624; ZA 975507 A 19970620