US3677016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion protection for well casing of offshore structure
Assignee: Chicago Bridge and Iron Co
•
Filing: 1971-02-08
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Granted: 1972-07-18
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Expires: 1991-02-08
Abstract
Abstract An offshore deep water oscillating oil well drilling or oil production structure having an oil drilling or oil production platform and support therefor having an essentially vertically displaced tubular template fixedly secured to the platform and platform support, said tubular template having its bottom end open and positioned to project below sea level when the platform is positioned offshore in a body of water, a closure at the upper end of the tubular template adapted to seal and close the annular space between the tubular template and a casing positioned in the tubular template, and a conduit communicating with the inside of the tubular template below the closure for feeding oil inside the tubular template.
Inventors
- 👤 James P Garrigus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:03
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/12; E21B7/128; E21B41/00; E21B41/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
152 words
An offshore deep water oil well drilling or oil production structure comprising: a vertical oscillating support secured to the bottom of a body of water, a platform mounted on the vertical support above the water, a vertical tubular template attached to the vertical support having an upper end extending above the platform and terminating at its open lower end in the water, a well casing secured at its lower end in the bottom of the body of water and extending upwardly inside the tubular template and ending above the template, a closure at the upper end of the tubular template adapted to seal and close the annular space between the tubular template and the casing while permitting slidable axial movement of the casing relative to the closure, and a conduit communicating with the inside of the tubular template below the closure for feeding oil inside the tubular template and around the casing.
Claim 2
Dependent Claim
152 words
An offshore deep water oil well drilling or oil production structure comprising: a vertical oscillating support secured to the bottom of a body of water, a platform mounted on the vertical support above the water, a vertical tubular template attached to the vertical support having an upper end extending above the platform and terminating at its open lower end in the water, a well casing secured at its lower end in the bottom of the body of water and extending upwardly inside the tubular template and ending above the template, a closure at the upper end of the tubular template adapted to seal and close the annular space between the tubular template and the casing while permitting slidable axial movement of the casing relative to the closure, and a conduit communicating with the inside of the tubular template below the closure for feeding oil inside the tubular template and around the casing.
Claim 3
Dependent Claim
37 words
An offshore structure according to claim 1 in which spacers are located between the casing and the tubular template to maintain them in substantially axial position relative to one another and prevent their wearing against each other.
Claim 4
Dependent Claim
32 words
An offshore structure according to claim 1 in which the closure is a bellows which is secured at one end to the template and the other end is secured around the casing.
Claim 5
Dependent Claim
33 words
An offshore structure according to claim 1 in which the tubular template has means to determine when the level of an oil-water interface in the tubular template is near the bottom end thereof.
Claim 6
Dependent Claim
27 words
An offshore structure according to claim 1 in which the vertical support is pivotally mounted to a base support on the bottom of the body of water.
Claim 7
Dependent Claim
54 words
An offshore structure according to claim 1 in which the tubular template comprises a guide pipe secured to the vertical support and a centralizer pipe therein, said casing being positioned inside the centralizer pipe, and spacers are positioned between the guide pipe and the centralizer pipe, and between the centralizer pipe and the casing.
Claim 8
Dependent Claim
22 words
An offshore structure according to claim 6 in which the guide pipe and centralizer pipe are attached together to move in unison.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |