A lap weld connection type that best meets all requirements for six inch and larger casing and screen is the welding collar.

Welding collars are factory installed on one end of the joint. Width of the collar ranges from two to six inches with the casing end extending approximately midway through the length of the collar.

A properly made welding collar connection is as strong or stronger than the casing (API threaded and coupled joint strength by comparison is less than 70% of casing strength). Removal of casing or screen sections requires only removal of the field weld at the top of the collar. Such sections are easily reinstalled since the original faces of the tubes have not changed. Finally transportation and handling damage is reduced.

The importance of having a field connection equal in strength to the casing or screen material cannot be overemphasized. Experience has demonstrated this frequently to unwary drilling contractors.

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