Wellhead and control stack pressure test plug tool
First Claim
1. A test plug tool used to test a pressure integrity of a joint between a production casing to a wellhead stack assembly, comprising:
- a tubular member that suspends a test plug in the production casing;
a hanger flange located above the test plug, the hanger flange having a bottom shoulder received in a bowl-shaped abutment above a top end of the production casing in the wellhead stack assembly, and further including at least one peripheral groove for retaining at least one high-pressure seal that provides a fluid seal between the hanger flange and the wellhead stack assembly;
a fluid passage through a sidewall of the tubular member, the fluid passage being located below the hanger above the test plug; and
the test plug comprises a cup tool that includes an elastomeric cup for sealing against an inside of the production casing, an annular sealing element compressed against the inside of the production casing by the elastomeric cup, and a gauge ring that inhibits the elastomeric sealing element from being extruded into an annulus between a bullnose and the inside of the production casing.
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Accused Products
Abstract
A test plug tool for use in testing a pressure integrity of a pressure control stack mounted to a wellhead, including a joint between a casing and a casing support in the wellhead. The test plug tool includes a test plug of an appropriate diameter used to pressure test the pressure control stack as well as a joint between any one of a surface casing and the wellhead, an intermediate casing and an intermediate casing mandrel, and a production casing and a production casing mandrel. The pressure integrity of the wellhead is ensured at each stage of well drilling and well completion, and safety is improved. Optionally, a backpressure valve permits pressurized fluid that leaks below the test plug tool to flow upwardly through a central bore in a landing tool that is secured to the test plug tool to permit detection of the leak.
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Citations
20 Claims
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1. A test plug tool used to test a pressure integrity of a joint between a production casing to a wellhead stack assembly, comprising:
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a tubular member that suspends a test plug in the production casing; a hanger flange located above the test plug, the hanger flange having a bottom shoulder received in a bowl-shaped abutment above a top end of the production casing in the wellhead stack assembly, and further including at least one peripheral groove for retaining at least one high-pressure seal that provides a fluid seal between the hanger flange and the wellhead stack assembly; a fluid passage through a sidewall of the tubular member, the fluid passage being located below the hanger above the test plug; and the test plug comprises a cup tool that includes an elastomeric cup for sealing against an inside of the production casing, an annular sealing element compressed against the inside of the production casing by the elastomeric cup, and a gauge ring that inhibits the elastomeric sealing element from being extruded into an annulus between a bullnose and the inside of the production casing. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A test plug tool used to test a pressure integrity of a joint between a production casing and wellhead stack assembly, comprising:
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a tubular member having a pin threaded top end and a bottom end that suspends a test plug inside the production casing; a hanger flange located below the pin threaded top end, the hanger flange having a bottom shoulder received in a bowl-shaped abutment in the wellhead stack assembly, the hanger flange including at least one peripheral groove for retaining at least one high-pressure fluid seal that seals between the hanger flange and the wellhead stack assembly; a fluid passage through a sidewall of the tubular member, the fluid passage communicating with an inside of the tubular member, and is located below the hanger flange and above the bottom end of the tubular member; and the test plug comprises a cup tool comprising an elastomeric cup that engages the inside of the production casing, an annular sealing element compressed against the production casing by the elastomeric cup when the elastomeric cup is subjected to fluid pressure that moves the elastomeric cup against the annular sealing element, and a gauge ring that inhibits extrusion of the annular sealing element into an annulus between the bullnose and the production casing when the elastomeric cup is subjected to the fluid pressure. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A test plug tool used to test a pressure integrity of a joint between a production casing and a wellhead stack assembly, comprising:
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a tubular member for suspending a test plug inside a top end of the production casing, the tubular member having a pin threaded top end for threaded engagement with a flanged adapter for sealing a top of the wellhead stack assembly; a hanger flange located below the pin threaded top end, the hanger flange having a bottom shoulder received in a bowl-shaped abutment in a tubing head spool of the wellhead stack assembly, the hanger flange including at least one peripheral groove for retaining an O-ring seal that provides a fluid seal between the hanger flange and the tubing head spool; and a fluid passage through a sidewall of the tubular member, the fluid passage being located below the hanger flange and above the test plug. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification