EP 0428180 A1 19910522 - Control system for guiding boring tools and a sensing system for locating the same.
Title (en)
Control system for guiding boring tools and a sensing system for locating the same.
Title (de)
Kontrollsystem zum Leiten von Bohrwerkzeugen und Messsystem, diese zu lokalisieren.
Title (fr)
Système de contrÔle pour guider des outils de forage et système capteur pour les détecter.
Publication
Application
Priority
- EP 86302534 A 19860404
- US 72058285 A 19850405
- US 72280785 A 19850412
- US 72379285 A 19850416
Abstract (en)
A control system for guiding a boring tool in a bore hole, characterised in that the tool has a longitudinal tool axis and includes motive means for advancing the tool axially through the earth and steering means for directing the motion of the tool relative to said axis in response to control signals, said control system compromising, axial electromagnetic source means for generating an axial alternating magnetic field directed along an axial source axis; a sensing assembly remote from said source means and including first and second pickup coils for sensing said alternating magnetic field, each of said first and second pickup coils, being responsive to the change of magnetic flux linked thereby by generating respective first and second electrical signals systematically related thereto, having a respective coil axis and being rigidly mounted in respect to the other with their respective axes at a substantial angle with respect to each other, and defining a sensing assembly axis substantially normal to both said coil axis, being balanced in respect to said sensing assembly axis to generate a respective null electrical signal when the lines of magnetic flux at the respective coil are normal to the respective coil axis at said sensing assembly axis; means responsive to said first and second electrical signals for indicating to direction of lines of magnetic flux a said sensing assembly relative to said sensing assembly axis, thereby indicating the attitude of said source means relative to said first and second pickup coils; control means for providing control signals for controlling said steering means.
IPC 1-7
IPC 8 full level
E21B 4/14 (2006.01); E21B 7/06 (2006.01); E21B 7/26 (2006.01); E21B 47/022 (2012.01); E21B 47/12 (2012.01)
CPC (source: EP US)
E21B 4/145 (2013.01 - EP); E21B 7/068 (2013.01 - EP); E21B 7/267 (2020.05 - EP US); E21B 47/0228 (2020.05 - EP); E21B 47/13 (2020.05 - EP)
Citation (search report)
- [A] US 3731752 A 19730508 - SCHAD C
- [A] US 3712391 A 19730123 - COYNE J
- [A] US 3529682 A 19700922 - COYNE JAMES C, et al
- [AD] US 3656161 A 19720411 - MACPHERSON WILLIAM FREDERICK
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0202013 A2 19861120; EP 0202013 A3 19880803; EP 0202013 B1 19930303; AT E109866 T1 19940815; AT E132226 T1 19960115; AT E86355 T1 19930315; AU 5565286 A 19861009; AU 589615 B2 19891019; CA 1255651 A 19890613; CA 1274817 A 19901002; DE 3650026 D1 19940915; DE 3650026 T2 19941201; DE 3650461 D1 19960208; DE 3650461 T2 19960515; DE 3687855 D1 19930408; DE 3687855 T2 19930701; EP 0428180 A1 19910522; EP 0428180 B1 19951227; EP 0428181 A1 19910522; EP 0428181 B1 19940810
DOCDB simple family (application)
EP 86302534 A 19860404; AT 86302534 T 19860404; AT 90122530 T 19860404; AT 90122531 T 19860404; AU 5565286 A 19860404; CA 505910 A 19860404; CA 602247 A 19890608; DE 3650026 T 19860404; DE 3650461 T 19860404; DE 3687855 T 19860404; EP 90122530 A 19860404; EP 90122531 A 19860404