US4919456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Union for pipe or tree with metal and resilient seals
Assignee: Halliburton Co
•
Filing: 1989-04-10
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Granted: 1990-04-24
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Expires: 2009-04-10
Abstract
Abstract Disclosed is a pipe union having a reliable metal ring seal and a resilient seal. The resilient seal is on the pin portion of the union, which has an internal seal surface. The box portion of the union has a bore to sealingly receive the resilient seal and an internal seal surface. The metal ring seal is compressed into sealing engagement with the pin portion and box portion sealing surfaces when the union pin portion and union box portion are connected together by a threaded collar. When the union is utilized in a tree cap for an underwater wellhead and the union box portion is attached to the wellhead, the resilient seal serves as a secondary seal and protects the metal seal. Well servicing risers or lubricators may be connected to the tree cap box portion.
Inventors
- 👤 Kwok-Ping Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:42
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/068; E21B33/076; F; F16; F16L; F16L19/00; F16L19/02; F16L19/0212; F16L19/0218; Y; Y10; Y10S; Y10S285/00; Y10S285/901; Y10S285/917
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
108 words
A union for pipe comprising: (a) a pin portion having a resilient seal thereon and a sealing surface therein; (b) a box portion having threads thereon, a seal bore therein for sealingly receiving said resilient seal, and a sealing surface therein below said seal bore; (c) a metal seal ring for sealingly engaging said pin portion sealing surface and said box portion sealing surface; and (d) connecting means for positioning said resilient seal in sealing engagement in said box portion seal bore and said metal seal ring in sealing engagement with said pin portion and box portion sealing surfaces and for connecting said pin and box portions together.
Claim 2
Dependent Claim
108 words
A union for pipe comprising: (a) a pin portion having a resilient seal thereon and a sealing surface therein; (b) a box portion having threads thereon, a seal bore therein for sealingly receiving said resilient seal, and a sealing surface therein below said seal bore; (c) a metal seal ring for sealingly engaging said pin portion sealing surface and said box portion sealing surface; and (d) connecting means for positioning said resilient seal in sealing engagement in said box portion seal bore and said metal seal ring in sealing engagement with said pin portion and box portion sealing surfaces and for connecting said pin and box portions together.
Claim 3
Dependent Claim
30 words
The union of claim 1 wherein the pin portion includes: (a) a groove around said pin portion for receiving the resilient seal; and (b) an external shoulder above said groove.
Claim 4
Dependent Claim
37 words
The union of claim 2 wherein the pin portion further includes an external sealing surface between the groove and shoulder and the box portion includes a sealing surface sealingly engageable with said pin portion external sealing surface.
Claim 5
Dependent Claim
35 words
The union of claim 2 wherein the connecting means is a collar, said collar having an internal shoulder engageable with the pin portion external shoulder and internal threads threadedly engageable with the box portion threads.
Claim 6
Dependent Claim
14 words
The union of claim 4 wherein the collar has at least one ear thereon.
Claim 7
Dependent Claim
111 words
A union for pipe having a resilient seal and a metal seal ring comprising: (a) a pin portion having an external shoulder and a groove below said external shoulder thereon, and a sealing surface therein; (b) a resilient seal in said groove; (c) a box portion having threads thereon, an internal seal bore, and a sealing surface therein below said seal bore; (d) a metal seal ring for sealingly engaging said pin portion sealing surface and said box portion sealing surface; and (e) a collar around said pin portion, said collar having an internal shoulder engageable with said pin portion external shoulder and internal threads engageable with said box portion threads.
Claim 8
Dependent Claim
111 words
A union for pipe having a resilient seal and a metal seal ring comprising: (a) a pin portion having an external shoulder and a groove below said external shoulder thereon, and a sealing surface therein; (b) a resilient seal in said groove; (c) a box portion having threads thereon, an internal seal bore, and a sealing surface therein below said seal bore; (d) a metal seal ring for sealingly engaging said pin portion sealing surface and said box portion sealing surface; and (e) a collar around said pin portion, said collar having an internal shoulder engageable with said pin portion external shoulder and internal threads engageable with said box portion threads.
Claim 9
Dependent Claim
39 words
The union of claim 6 wherein the pin portion further includes an external sealing surface thereon between the external shoulder and groove, and the box portion includes a sealing surface sealingly engageable with said pin portion external sealing surface.
Claim 10
Dependent Claim
135 words
A tree cap for a wellhead comprising: (a) a blanking plug having a union pin portion on one end thereof, said pin portion having a sealing surface therein; (b) a resilient seal on said union pin portion; (c) a union box portion connectible to a wellhead, said union box portion having threads thereon, a seal bore therein for sealingly receiving said resilient seal and a sealing surface therein below said seal bore; (d) a metal seal ring for sealingly engaging said pin portion sealing surface and said box portion sealing surface; and (e) connecting means for positioning said resilient seal in sealing engagement in said box portion seal bore and said metal seal ring in sealing engagement with said pin portion and box portion sealing surfaces and for connecting said pin and box portions together.
Claim 11
Dependent Claim
135 words
A tree cap for a wellhead comprising: (a) a blanking plug having a union pin portion on one end thereof, said pin portion having a sealing surface therein; (b) a resilient seal on said union pin portion; (c) a union box portion connectible to a wellhead, said union box portion having threads thereon, a seal bore therein for sealingly receiving said resilient seal and a sealing surface therein below said seal bore; (d) a metal seal ring for sealingly engaging said pin portion sealing surface and said box portion sealing surface; and (e) connecting means for positioning said resilient seal in sealing engagement in said box portion seal bore and said metal seal ring in sealing engagement with said pin portion and box portion sealing surfaces and for connecting said pin and box portions together.
Claim 12
Dependent Claim
18 words
The tree cap of claim 8 wherein the blanking plug has a passage therethrough having a thread therein.
Claim 13
Dependent Claim
26 words
The tree cap of claim 8 wherein the blanking plug pin portion includes a groove around for receiving the resilient seal and an external shoulder thereon.
Claim 14
Dependent Claim
42 words
The tree cap of claim 10 wherein the blanking plug pin portion further includes an external sealing surface thereon between the groove and shoulder and the union box portion has a sealing surface sealingly engageable with said pin portion external sealing surface.
Claim 15
Dependent Claim
38 words
The tree cap of claim 10 wherein the connecting means is a collar, said collar having an internal shoulder engageable with the blanking plug pin portion external shoulder and internal threads engageable with the union box portion threads.
Claim 16
Dependent Claim
15 words
The tree cap of claim 12 wherein the collar has at least one ear thereon.
Claim 17
Dependent Claim
138 words
A tree cap having a resilient seal and a metal seal ring comprising: (a) a blanking plug having a union pin portion on one end thereof, said pin portion including an external shoulder and a groove below said external shoulder thereon, and a sealing surface therein; (b) a resilient seal in said groove; (c) a union box portion connectible to a wellhead, said union box portion having threads thereon, an internal seal bore, and a sealing surface therein below said seal bore; (d) a metal seal ring for sealingly engaging said blanking plug in portion sealing surface and said union box portion sealing surface; and (e) a collar around said blanking plug pin portion, said collar having an internal shoulder engageable with said union pin portion external shoulder and internal threads engageable with said union box portion threads.
Claim 18
Dependent Claim
138 words
A tree cap having a resilient seal and a metal seal ring comprising: (a) a blanking plug having a union pin portion on one end thereof, said pin portion including an external shoulder and a groove below said external shoulder thereon, and a sealing surface therein; (b) a resilient seal in said groove; (c) a union box portion connectible to a wellhead, said union box portion having threads thereon, an internal seal bore, and a sealing surface therein below said seal bore; (d) a metal seal ring for sealingly engaging said blanking plug in portion sealing surface and said union box portion sealing surface; and (e) a collar around said blanking plug pin portion, said collar having an internal shoulder engageable with said union pin portion external shoulder and internal threads engageable with said union box portion threads.
Claim 19
Dependent Claim
43 words
The tree cap of claim 14 wherein the blanking plug union pin portion includes a sealing surface thereon between the external shoulder and groove, and the union box portion includes therein a sealing surface sealingly engageable with said union pin portion sealing surface.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-23 | 1993-10-23 | 1994-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-23 | 1997-10-23 | 1998-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-23 | 2001-10-23 | 2002-04-24 | $7700.00 | Window Closed / Lapsed |