Patent US3928903A successfully refreshed from Google Patents.
US3928903A
Expired / Lapsed
US
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Method of making a double-walled pipe assembly
Assignee: Atlantic Richfield Co
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Filing: 1975-01-29
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Granted: 1975-12-30
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Expires: 1995-01-29
Abstract
Abstract A double-walled pipe assembly for use in a permafrost zone in a wellbore in the earth composed of inner and outer concentric spaced-apart pipes rigidly fixed apart by use of threaded annular connector means which are screwed into the annulus between the pipes at either end of the assembly. The connector means is of substantial size and strength notwithstanding the potential heat loss therethrough so that the connection can withstand without plastic deformation the force requirements to which it is to be subjected. A method for making a double-walled assembly using only threaded connector means wherein the outer wall of the inner pipe and the inner wall of the outer pipe are threaded in a manner so that it is known exactly where the threads start on each pipe and each connector means is also threaded on its inner and outer walls in a manner such that the threads start at the same point on the connector means. The inner and outer pipes are then arranged in a concentric spaced-apart relation with the thread start marks aligned with one another. The connector means are then screwed into the annulus between the two pipes by first aligning the thread start mark on the connector means so that it is between the thread start marks on the two opposing pipes.
Inventors
- 👤 Bart D Richardson
- 👤 Michael L Waggoner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:19
CPC Classifications
E; E21; E21B; E21B17/00; E21B36/00; E21B36/003; F; F16; F16L; F16L39/00; F16L59/00; F16L59/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49361; Y10T29/49764; Y10T29/49778; Y10T29/4978; Y10T29/49826; Y10T29/49861
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
362 words
A method for making a double-walled pipe assembly for use in a permafrost zone in a wellbore in the earth comprising providing two sections of pipe, the first pipe being of smaller outside diameter than the inside diameter of the second pipe so that the first pipe can be inserted into the second pipe and the outer wall of the first pipe spaced from the inner wall of the second pipe to provide an annulus between said pipes, a first end of each of said first and second pipes being threaded, said threads being in the same rotational direction, said first ends being threadably joined by a first connector means, said first connector means being of sufficient size so that it forms an essentially rigid connection between said first and second pipes, the length of the threaded portions on the first ends of said pipes and said first connector means being sufficient to withstand the force requirements to which said assembly is expected to be subjected, threading the outer surface of the second end of said first pipe and the inner surface of the second end of said second pipe, said threads being in the same rotational direction, said threads starting at the same relative points on said second ends of said pipes, marking the thread start points on the second ends of both pipes, providing a second connector means which when threaded will fit into the annulus between said second ends, threading said second connector means on its inner and outer surfaces so the inner thread will mate with the thread on the outer surfaces of said first pipe and the other thread will mate with the thread on the inner surface of said second pipe, said second connector means being of a size and threaded portion length essentially equivalent to said first connector means, starting the threads on the inner and outer surfaces of said seconD connector means at the same point and marking that point of thread starting, aligning the thread start mark on said second connector means between the thread start marks on the second ends of said pipes and screwing said second connector means into the annulus.
Claim 2
Independent Claim
362 words
A method for making a double-walled pipe assembly for use in a permafrost zone in a wellbore in the earth comprising providing two sections of pipe, the first pipe being of smaller outside diameter than the inside diameter of the second pipe so that the first pipe can be inserted into the second pipe and the outer wall of the first pipe spaced from the inner wall of the second pipe to provide an annulus between said pipes, a first end of each of said first and second pipes being threaded, said threads being in the same rotational direction, said first ends being threadably joined by a first connector means, said first connector means being of sufficient size so that it forms an essentially rigid connection between said first and second pipes, the length of the threaded portions on the first ends of said pipes and said first connector means being sufficient to withstand the force requirements to which said assembly is expected to be subjected, threading the outer surface of the second end of said first pipe and the inner surface of the second end of said second pipe, said threads being in the same rotational direction, said threads starting at the same relative points on said second ends of said pipes, marking the thread start points on the second ends of both pipes, providing a second connector means which when threaded will fit into the annulus between said second ends, threading said second connector means on its inner and outer surfaces so the inner thread will mate with the thread on the outer surfaces of said first pipe and the other thread will mate with the thread on the inner surface of said second pipe, said second connector means being of a size and threaded portion length essentially equivalent to said first connector means, starting the threads on the inner and outer surfaces of said seconD connector means at the same point and marking that point of thread starting, aligning the thread start mark on said second connector means between the thread start marks on the second ends of said pipes and screwing said second connector means into the annulus.
Claim 3
Dependent Claim
14 words
A method according to claim 1 wherein all threads rotate in the right-hand direction.
Claim 4
Dependent Claim
173 words
A method according to claim 1 wherein threads on the first end of each pipe are marked as to their starting point either before, during, or after said first ends are threaded, said first connector means being threaded on its inner and outer surfaces so the inner thread will mate with the thread on the outer surface of said first pipe and the outer thread will mate with the thread on the inner surface of said second pipe, the threads on the inner and outer surfaces of said first connector means are started at the same point and that point of thread starting is marked, aligning the thread start marks on said first ends of said pipes with one another, aligning the thread start mark on said first connector between the thread start marks on said first ends of said pipes, screwing said first connector into the annulus and, if necessary, machining the second ends of said pipes so that they are in essentially the same plane before said second ends are threaded.
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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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |