초록 ▼

A pipe suspension system for suspending vertically oriented well casings within other well casings and being adapted particularly for well casing hanger systems especially adapted for underwater installation wherein casing hanger suspension systems may be installed at or near the bottom of the body

A pipe suspension system for suspending vertically oriented well casings within other well casings and being adapted particularly for well casing hanger systems especially adapted for underwater installation wherein casing hanger suspension systems may be installed at or near the bottom of the body of water. A releasable locking mechanism is employed which includes a self contracting expandable lock positioning ring that is transported during installation of an inner pipe by a physical interconnection with the inner well casing. The lock positioning ring functions to control a locking ring that transfers the weight of the inner pipe to the outer casing and further functions in a weight supporting capacity to assist the locking ring in supporting the weight of the inner casing. Upon raising of the inner well casing relative to the outer casing, the lock positioning ring retracts wtihin a receptacle provided in the inner casing so as not to interfere with casing removal.

대표청구항 ▼

A well casing suspension mechanism for suspending an inner well casing within and from an outer well casing, said casing suspension mechanism comprising: casing suspension coupling means adapted to be connected to outer well casing extending into a well bore, said coupling means being formed interna

A well casing suspension mechanism for suspending an inner well casing within and from an outer well casing, said casing suspension mechanism comprising: casing suspension coupling means adapted to be connected to outer well casing extending into a well bore, said coupling means being formed internally to define an internal key recess means and internal lock recess means, said lock recess means defining upwardly directed stop shoulder surface means and said key recess means defining internal tapered surface means; a tubular hanger body being receivable within said coupling means and being connectable to said inner well casing and defining an external lock receiving recess, an external key receiving recess and an external lock positioner recess, said tubular hanger body further defining external tapered downwardly directed shoulder means; a split ring type locking element being movably positioned about said tubular hanger body and defining lock means adapted to be received within said lock recess means and in engagement with said stop shoulder surface means, said locking element defining key means adapted to be received within said key recess means, said key means defining external tapered surface means being engagable with said internal tapered surface means of said key recess means, said locking element being of spring nature and being normally expanded to a position locating said lock and key means respectively within said lock and key recess means, said locking element being radially contractable by externally applied mechanical force by reaction of said internal and external tapered surface means to withdraw said lock and key means from said lock and key recess means, in said radially contractable condition said locking element being at least partially received within said external lock receiving recess of said tubular hanger body; and split ring type lock positioning means being received between said tubular hanger body and said casing suspension coupling means and being of spring nature normally contacting said lock positioning element into said lock positioner recess of said tubular hanger body, said lock positioning element being positioned for contact by said tapered downwardly directed shoulder means upon downward movement of said hanger body relative thereto and being radially movable by reacting engagement thereof by said downwardly directed shoulder means against the spring tension thereof into load supporting engagement with said casing suspension coupling and into load transferring engagement with said locking element, said locking element supporting said lock positioning means during said radial movement of said lock positioning means.