Patent ID: 7575059
Filing Date: 2009-08-18
Classification: E21B

Abstract:
1. An apparatus for securing a sonde to an inner wall of a well casing, the sonde comprising a clamp expandable from a contracted position to an expanded position in which the clamp can engage said inner wall, wherein the apparatus comprises: a member for releasably engaging with the clamp to hold the clamp in said contracted position; a spring connected to the member such that, when the spring is in a compressed state, the member is constrained into engagement with the clamp to hold said clamp in the contracted position; and a mechanism for holding the spring in the compressed state during a first mode of operation and, in a second mode of operation, for releasing the spring from the compressed state thus disengaging the member from the clamp to permit the clamp to expand into said expanded position, the mechanism including a material which, in said first mode of operation, is in a solid state and, in said second mode of operation, is in a liquid state.