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The major role of Stop Collar is to keep the centralizers of several types and other attachments of casings in place. It is available in two types Slip-On-Style and Hinged Collars. The Hinged stop collar are known to hold around 7,000 lb. of force when installed in casing. This type of collar is generally used when the condition of the well is normal. Hinged stop collar has the capability to increase holding force. First it is centered on the surface of the pipe, then directly through the open hinge, a nail is inserted, preceded by strengthening of the set crew uniformly. Maximum holding capacity of the hinged collar is 15,000 lb of force. However, slip-on stop collar is placed at the end of the casing, up to the top of the joint. This collar is strengthened around 35 ft-lbf. The maximum capacity of this collar is up to 20,000 lb.
Key Points of Stop Collar