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US 8,505,636 B2Granted
Wellhead assembly having a nested tubing head
OwnerDouglas Wade Schepp, Scott Travis Websterinventors
Life of this patent
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Abstract
A wellhead assembly includes a casing head and a tubing head that is landed within the casing head when the tubing head is landed. The casing head has top and bottom ends, and its bottom end is coupled to surface casing. The tubing head also has top and bottom ends, and its bottom end is coupled to an additional casing string, such as production casing. The tubing head can be landed on the casing head through a blowout preventer.
Claims29
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,
- wherein the threaded portion of the tubing head comprises a tubing head lock screw port, the outer surface of the tubing hanger comprises an upper tubing hanger shoulder aligned with the lock screw port;
- (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.
5 more elements
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, and wherein the tubing head further comprises a body across which extends a tubing head annulus access port allowing access to the interior of the tubing head, and the casing head further comprises a body across which extends a casing head annulus access port aligned with the tubing head annulus access port;
- (c) a seal pack-off assembly located in an outermost annulus between the exterior of the tubing head and the interior of the casing head and positioned to isolate the tubing head annulus access port;
- (d) a primary seal located in the outermost annulus on top of the seal pack-off assembly;
- and
- (e) a retaining ring located in the outermost annulus and screwed into the top end of the casing head above the primary seal.
3 more elements
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, fixedly coupled to and landed within the casing head, wherein the top end of the tubing head is threaded and comprises a tubing head lock screw port;
- (c) a tubing hanger landed within the tubing head, wherein the tubing hanger has an outer surface comprising an upper tubing hanger shoulder aligned with the tubing head lock screw port;
- (d) a completion flange screwed on to the top end 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.
3 more elements
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, fixedly coupled to and landed within the casing head, wherein the top end of the tubing head is threaded and comprises a tubing head lock screw port and wherein the tubing head further comprises a body across which extends a tubing head annulus access port allowing access to the interior of the tubing head;
- (c) a seal pack-off assembly located in an outermost annulus between the exterior of the tubing head and the interior of the casing head and positioned to isolate the tubing head annulus access port;
- (d) a primary seal located in the outermost annulus on top of the seal pack-off assembly;
- and
- (e) a retaining ring located in the outermost annulus and screwed into the top end of the casing head above the primary seal.
3 more elements
Dependencies are inferred from the claim text.