Patent ID: 7198101
Filing Date: 2007-04-03
Classification: E21B

Abstract:
1. Downhole apparatus comprising a first part connected to a second part by connecting means, the connecting means limiting axial and rotational movement of the first part relative to the second part and comprising a connecting member having a first end connected to said first part so as to limit axial and rotational movement of said first part relative to said first end and having a second end connected to said second part so as to limit axial and rotational movement of said second part relative to said second end, wherein the connecting member is provided between said first and second ends with a region of weakness in the connecting member provided by weakening means, and with means for minimizing stress generated in the connecting means at said region of weakness when torque is transmitted in use between the first and second parts via the connecting member, the first and second parts being separable from each other by application of a pulling force on the first part while the second part is held stationary to break the connecting means at the region of weakness.