Patent ID: 8505636
Filing Date: 2013-08-13
Classification: E21B,Y10T

Abstract:
1. A wellhead assembly, comprising: (a) a casing head having top and bottom ends, wherein the bottom end of the casing head is coupled to surface casing; (b) a tubing head having top and bottom ends, wherein the bottom end of the tubing head is coupled to an additional casing string and the tubing head is fixedly coupled to and landed within the casing head, wherein the tubing head comprises a threaded portion that includes the top end of the tubing head, and wherein the top end of the tubing head extends past the top end of the casing head; and (c) a tubing hanger contained within the tubing head and coupled to production tubing, the tubing hanger having an outer surface comprising a lower tubing hanger shoulder and the tubing head having an inner surface comprising a production tubing support shoulder, wherein the lower tubing hanger shoulder rests on the production tubing support shoulder, (d) a completion flange screwed on to the threaded portion of the tubing head, the completion flange comprising a completion flange lock screw port aligned with the tubing head lock screw port; and (e) a lock screw extending through the tubing head and completion flange lock screw ports and abutting against the upper tubing hanger shoulder.