EP 0212316 B1 19890405 - DRILL STRING FOR DEFLECTION DRILLING, METHOD OF USING SUCH A STRING AND DEFLECTING DEVICE USED IN THIS STRING
Title (en)
DRILL STRING FOR DEFLECTION DRILLING, METHOD OF USING SUCH A STRING AND DEFLECTING DEVICE USED IN THIS STRING
Publication
Application
Priority
FR 8511608 A 19850730
Abstract (en)
[origin: US4694914A] The present invention relates to drilling a well with a bent bore. A bending device is inserted in a drilling string between a stabilizer and an active motor element. If the drilling string is rotated in one direction the bending device takes up a rectilinear configuration for ensuring rectilinear drilling, and if the drilling string is rotated in the opposite direction it takes up a bent configuration, thereby transforming itself into a bent coupling for curved drilling. The device comprises two superposed sleeves (1, 2) one of which is capable of rotating through a limited angle about a pivot (3) whose axis lies at the same small angle (A) to the axes (10, 10A) of both sleeves. The invention is applicable to drilling oil wells or geothermal wells.
IPC 1-7
IPC 8 full level
CPC (source: EP US)
E21B 7/067 (2013.01 - EP US)
Designated contracting state (EPC)
BE DE FR GB NL
DOCDB simple family (publication)
EP 0212316 A1 19870304; EP 0212316 B1 19890405; BR 8603579 A 19870304; DD 273872 A5 19891129; DE 3662712 D1 19890511; FR 2585760 A1 19870206; FR 2585760 B1 19870925; JP S6229695 A 19870207; NO 863031 D0 19860728; NO 863031 L 19870202; US 4694914 A 19870922
DOCDB simple family (application)
EP 86110190 A 19860724; BR 8603579 A 19860729; DD 29288586 A 19860725; DE 3662712 T 19860724; FR 8511608 A 19850730; JP 17982486 A 19860730; NO 863031 A 19860728; US 88866486 A 19860723