Global Patent Index - EP 1923534 A1

EP 1923534 A1 20080521 - Steerable bit assembly and methods

Title (en)

Steerable bit assembly and methods

Title (de)

Steuerbare Bohrmeißelanordnung und entsprechende Verfahren

Title (fr)

Ensemble trépan orientable et procédés

Publication

EP 1923534 A1 20080521 (EN)

Application

EP 08001582 A 20040913

Priority

  • EP 04783755 A 20040913
  • US 50305303 P 20030915

Abstract (en)

A drilling system includes a steerable bottomhole assembly (BHA) (108) having a steering unit (120) and a control unit (122) that provide dynamic control of drill bit (112) orientation or tilt. Exemplary steering units (120) can adjust bit orientation at a rate that approaches or exceeds the rotational speed of the drill string (110) or drill bit (112), can include a dynamically adjustable articulated joint having a plurality of elements that deform in responds to an excitation signal, can include adjustable independently rotatable rings for selectively tilting the bit, and/or can include a plurality of selectively extensible force pads. The force pads are actuated by a shape change material that deforms in response to an excitation signal.

IPC 8 full level

E21B 10/62 (2006.01); E21B 7/06 (2006.01); E21B 10/60 (2006.01); E21B 10/61 (2006.01); E21B 17/10 (2006.01)

CPC (source: EP)

E21B 7/067 (2013.01); E21B 10/61 (2013.01); E21B 10/62 (2013.01); E21B 17/1014 (2013.01)

Citation (applicant)

US 4291773 A 19810929 - EVANS ROBERT F

Citation (search report)

Designated contracting state (EPC)

DE GB

DOCDB simple family (publication)

EP 1923534 A1 20080521; EP 1923534 B1 20101110; EP 1933003 A1 20080618; EP 1933003 B1 20101110

DOCDB simple family (application)

EP 08001582 A 20040913; EP 08001569 A 20040913