Title (en)

Directional drilling system

Title (de)

Richtbohrsystem

Title (fr)

Système de forage directionnel

Publication

EP 1143105 A1 20011010 (EN)

Application

EP 01201151 A 20010328

Priority

• US 54260700 A 20000404
• US 20094100 P 20000501
• US 56380100 A 20000502

Abstract (en)

A system is provided for directionally drilling a wellbore using a drill string having a mud motor, a drill bit, and a drive shaft for transmitting torque from the mud motor to the drill bit. The system includes a variable gauge stabilizer that is adjustable between retracted and deployed positions for influencing the drop or build angle of the drill bit. An instrument is carried within the drill string adjacent the drill bit for measuring data while drilling, and a telemetry system transmits the measured data to a driller at the surface. The telemetry system includes a transmitter disposed in the drill string beneath the mud motor for inducing a signal corresponding to the measured data into the subsurface formation surrounding the wellbore, and a receiver disposed in the drill string above the mud motor for detecting and recovering the measured data from the induced signal. <IMAGE>

IPC 1-7

E21B 47/12; E21B 7/06; E21B 4/02; E21B 17/10

IPC 8 full level

E21B 7/06 (2006.01); E21B 17/10 (2006.01); E21B 47/01 (2012.01); E21B 47/12 (2012.01)

CPC (source: EP US)

E21B 7/068 (2013.01 - EP); E21B 17/1014 (2013.01 - EP); E21B 47/013 (2020.05 - EP US); E21B 47/12 (2013.01 - EP US); E21B 47/13 (2020.05 - EP); E21B 47/017 (2020.05 - EP US)

Citation (applicant)

• US 4848490 A 19890718 - ANDERSON CHARLES A [GB]
• US 5339914 A 19940823 - LEE PAUL [CA]
• US 5117927 A 19920602 - ASKEW WARREN E [US]
• US 5448227 A 19950905 - ORBAN JACQUES [US], et al
• US 5375098 A 19941220 - MALONE DAVID [US], et al

Citation (search report)

• [XY] EP 0900917 A1 19990310 - ANADRILL INT SA [PA], et al
• [Y] GB 2336171 A 19991013 - DRESSER IND [US]
• [Y] US 5437308 A 19950801 - MORIN PIERRE [FR], et al
• [Y] US 5720355 A 19980224 - LAMINE ETIENNE [BE], et al
• [A] WO 9928587 A1 19990610 - HALLIBURTON ENERGY SERV INC [US]
• [A] EP 0903591 A2 19990324 - ANADRILL INT SA [PA], et al
• [A] GB 2261308 A 19930512 - MARCONI GEC LTD [GB]
• [A] EP 0911483 A2 19990428 - HALLIBURTON ENERGY SERV INC [US]
• [A] GB 2313393 A 19971126 - APPLIED TECH ASS [US]

Designated contracting state (EPC)

DK ES GB IT NL

DOCDB simple family (publication)

EP 1143105 A1 20011010; EP 1143105 A8 20020424; CA 2342594 A1 20011004; NO 20011665 D0 20010403; NO 20011665 L 20011005

DOCDB simple family (application)

EP 01201151 A 20010328; CA 2342594 A 20010403; NO 20011665 A 20010403