Patent ID: 7806175
Filing Date: 2010-10-05
Classification: E21B

Abstract:
1. A retrievable frac mandrel and well control adapter for facilitating completion, re-completion or workover of a cased well having a wellhead with a tubing head spool, comprising: a frac mandrel having a central passage and a bottom end adapted to be received in the tubing head spool and to provide a high-pressure fluid seal with a seal bore of the tubing head spool; a well control adapter that mounts to a top flange of the tubing head spool, the well control adapter comprising an axial seal bore that receives a top end of the frac mandrel and provides a high-pressure fluid seal around a smooth outer periphery of the top end of the frac mandrel, and an axial passage that has a diameter smaller than an outer diameter of the top end of the frac mandrel but at least as large as an internal diameter of the central passage of the frac mandrel; and a V-type packing received in the axial seal bore to provide the high pressure fluid seal around the top end of the frac mandrel, the V-type packing being supported on respective top and bottom ends by a respective top metal ring and a bottom metal ring, and compressed, when the well control adapter is mounted to the top flange of the tubing head spool, by a packing compression sleeve that slides over the top end of the frac mandrel and rests on the top flange of the tubing head spool.