Patent ID: 8371385
Filing Date: 2013-02-12
Classification: E21B

Abstract:
1. A subsea wellhead comprising: a wellhead housing; a valve support block having a lower portion that extends into the wellhead housing, the valve support block having a mandrel with a cylindrical exterior and an upward facing support surface extending radially outward from a lower end of the mandrel; a main bore formed axially through the valve support block; a tubing hanger for supporting a string of production tubing landed in the main bore, the tubing hanger having a tubing hanger production passage with a laterally extending tubing hanger production port; a valve support block production passage within the valve support block having-a lower inlet that registers with the tubing hanger production port and an upper end that opens at the upward facing support surface; a valve block having a bottom that lands on the support surface and a central opening that slides over and circumscribes the mandrel when the bottom lands on the support surface; a valve block production passage within the valve block that has an inlet on the bottom of the valve block and which sealingly registers with the upper end of the valve support block production passage; and at least one valve mounted to the valve block for opening and closing the valve block production passage.