Guide apparatus

Details Guide apparatus Guide apparatus

E - Fixed Constructions

21

B

E21B 29/06 (2006.01) E21B 17/10 (2006.01) E21B 23/04 (2006.01)

Patent

CA 2375582

The present invention provides a down-hole tool guide apparatus 6 suitable for use in controlling movement of a down-hole apparatus 1 provided with a pressurised working fluid supply in a borehole P. The apparatus comprises: a body 7 having a chamber 13 in which is slidably mounted a piston 14. A high pressure end 13a of the chamber 13 is connected 36 to the pressurised working fluid supply 10 for supplying pressurised working fluid to a high pressure side 32 of said piston 14. A low pressure end 13b of the chamber 13 is connected with the outside of the guide apparatus 6 and is provided with a spring 16 for applying a biasing force to the low pressure side 17 of the piston 14 corresponding to a predetermined threshold pressure of the pressurised fluid supply at the high pressure side of the piston 14. The body 7 mounts at least one shoe 25 having an engagement face 26. The piston 14 is operatively coupled to a shoe displacement mechanism 18, 19, 28, 29 so that the shoe 25 is held in a stowed position when the piston 14 is urged towards the high pressure end 13a of the chamber 13 by the spring 16, and is displaced outwardly so that the engagement face 26 projects outwardly of the body 7 when the piston 14 is displaced towards the low pressure end 13b of the chamber by supply of pressurised working fluid at a pressure higher than said threshold pressure.

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