A JOINT ELEMENT, A CASING STRING COMPRISING SUCH A JOINT ELEMENT AND A METHOD FOR COMPENSATING OF FORCES DUE TO THERMAL EFFECTS IN A CASING STRING

摘要

The present invention relates to a joint element (1,28) for connecting casing sections of a casing string for transporting fluids and/or gases. According to the invention the joint element (1,28) comprises at least one longitudinal part (2,29) arranged to be at least partly overlapping a second longitudinal part (3) or a casing section (32,33) and said at least one longitudinal part (2,29) is provided with connection means (10,11) arranged to connect said longitudinal part (2,29) with the second longitudinal part (3) or the casing sections (32,33) in a mounted state in such a way that the longitudinal part (2,29) is adapted to move axially relative to said second longitudinal part (3) or the casing sections (32,33) in an operative state, and that said joint element (1,28) comprises at least one shear member (10) with a predefined shear value, said shear member (10) is fixed on the first longitudinal part (2,29) and on the second longitudinal part (3) or the casing sections (32,33) in a mounted state, whereby said shear member (10) is adapted to shear when an axial force, e.g. due to thermal effects, exceeding the total shear value of said shear member (10) is exerted, allowing a relative axial movement between the longitudinal parts (2, 3) and the second longitudinal part (3) or the casing sections (32,33).