Patent ID: 9303465
Filing Date: 2016-04-05
CPC Classification: E21B

Claim Text:
1. A releasably lockable retrievable mule shoe assembly for use in a bottom hole orienting assembly of a drill string in directional drilling of a well, comprising: (i) a substantially cylindrical hollow elongate outer mule shoe member, having: (ii) an inner cylindrical tool member, containing a directional measurement tool, and adapted for insertion within said outer mule shoe member, having: (iii) a linearly slidably moveable locking pin member, for releasable locking engagement between the outer mule shoe member and the inner cylindrical tool member and/or the directional measurement tool and configured to allow disengagement downhole of said outer mule shoe member from said inner cylindrical tool member and/or directional measurement tool and withdrawal of said directional measurement tool from within said outer mule shoe member when said outer mule shoe member is lodged downhole in the well; (iv) aperture means in each of said inner cylindrical tool member, and said outer mule shoe member, extending perpendicular to a longitudinal axis of said outer mule shoe member and through said outer mule shoe member, for slidably receiving therewithin said locking pin member; (v) said locking pin member being located in said aperture means in said outer mule shoe member, and further slidably moveable into said aperture means in said inner cylindrical tool member, for releasably coupling said outer mule shoe member to said inner cylindrical tool member when said inner cylindrical tool member is inserted in said outer mule shoe member.