Apparatus and method for directional drilling using coiled tubing

(19)

(11)

EP 1 245 783 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	04.12.2002 Bulletin 2002/49

(43)	Date of publication A2:
	02.10.2002 Bulletin 2002/40

(21)	Application number: 02076823.0

(22)	Date of filing: 05.02.1997

(51)	International Patent Classification (IPC)⁷: E21B 7/06

(84)	Designated Contracting States:
	DE FR GB IT NL

(30)

Priority:

07.02.1996 US 11268 P
16.01.1997 US 783711

(62)	Application number of the earlier application in accordance with Art. 76 EPC:
	97300719.8 / 0787886

(71)	Applicants:
	Anadrill International SA Panama City (PA) DE GB IT NL SERVICES PETROLIERS SCHLUMBERGER 75007 Paris (FR) FR

(72)	Inventor:
	Dorel, Alain P. Houston, Texas 77082 (US)

(74)	Representative: Macquet, Christophe
	Schlumberger Cambridge Research Ltd, High Cross, Madingley Road Cambridge CB3 0EL Cambridge CB3 0EL (GB)

(54)	Apparatus and method for directional drilling using coiled tubing

(57) A steerable directional drilling tool assembly includes a bent housing (12) defining a bend angle and having a mud motor (13) in its upper section and a drill bit (15) below its lower section, an orienting tool (17) rotatably coupled to such upper section and suspended on coiled tubing (20) that extends upward to the surface, an electric motor in the orienting tool operable to rotate the bent housing in either hand direction to change or adjust the tool face angle of the bit, or continuously rotate the bent housing so that the bit drills straight-ahead, and an electric cable extending throughout the coiled tubing to furnish power from the surface to the electric motor and transmit electric signals to and from the surface. A logging tool can be included in the assembly for measuring characteristics of the formation, the borehole, and the tool assembly.

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