Importance

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Abstract

A casing head adapter is mounted upon the top of a casing of an oil well by being slipped over the oil well casing and mechanically locked into place. No welding is required to provide a substantially strong, fully pressure intergal casing head upon the top of the casing. The casing head adapter comprises a substantially cylindrical hollow body having a plurality of internal grooves to accommodate a number of O-rings and a plurality of curved wedges releasably mounted in one of the internal grooves. The wedges have upwardly directed teeth for frictional engagement with the casing if a sudden rise in downhole pressure forces the wedges upwardly. The casing head adapter is provided with a plurality of set screws for locking the wedges in place, as well as a number of release screws for assisting in releasing the wedges from the frictional engagement with the casing if the teeth 'bite' excessively into the casing due to an occasional rise in downhole pressure. At least one pressure test port is provided in the annular space between the casing and the casing head adapter. The sleeve type casing head adapter is removable by mechanically withdrawing the wedges from their engagement with the casing, therefore allowing reuse of the casing head adapter should the hole prove to be 'dry'.

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First Claim