WELL CASING HANGER ASSEMBLY

摘要

A well casing hanger assembly for releasably connecting first and second well casings to and from each other by a resiliently expandable and contractible locking means in which first and second locking shoulders are positioned to back up the locking means when it is expanded and which serve to positively guide the locking means into locking position and secure the locking means in the expanded position. One of the locking shoulders initially coacts with a receiving notch in the locking means for positively holding the locking means aligned and after the locking means is expanded and engaged between the first and second casings, the shoulder provides an additional backup adjacent the lower end of the locking means for maintaining the locking means in a secured position. Shearable holding means are provided for initially preventing the locking means from moving axially on the first member until the locking means expands and engages the second member. The shearable holding means may be positioned at the top, the bottom or intermediate the ends of the locking means.