Patent US3719230A successfully refreshed from Google Patents.
US3719230A
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US
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Casing pipe and method of casing a borehole
Assignee: Schlumberger Technology Corp
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Filing: 1971-03-15
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Granted: 1973-03-06
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Expires: 1991-03-15
Abstract
Abstract An article of manufacture and its use for casing boreholes used for transporting corrosive fluids is taught. A metal casing pipe is provided with a coating of a set resinous material having incorporated therein fibrous reinforcements. The so-coated casing pipe is placed in the borehole and when the steel is corroded away a reinforced resinous casing remains.
Inventors
- 👤 R Kemp
- 👤 R Blanchard
- 👤 R Chamberlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:39
CPC Classifications
E; E21; E21B; E21B17/00; E21B33/00; E21B33/10; E21B33/13; E21B33/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
A method of casing a borehole which penetrates a subterranean formation and through which a corrosive fluid is transported which comprises: a. bonding to substantially the entire outside surface of a metal casing pipe prior to its being lowered into said borehole, a coating material having sufficient strength to maintain the integrity of the borehole after the metal pipe is removed and substantially chemically inert to the corrosive fluid, b. securing the casing pipe in the borehole, and c. chemically dissolving the inner metal pipe away to leave the coating as the primary casing in the borehole.
Claim 2
Independent Claim
97 words
A method of casing a borehole which penetrates a subterranean formation and through which a corrosive fluid is transported which comprises: a. bonding to substantially the entire outside surface of a metal casing pipe prior to its being lowered into said borehole, a coating material having sufficient strength to maintain the integrity of the borehole after the metal pipe is removed and substantially chemically inert to the corrosive fluid, b. securing the casing pipe in the borehole, and c. chemically dissolving the inner metal pipe away to leave the coating as the primary casing in the borehole.
Claim 3
Dependent Claim
25 words
The method as defined in claim 1 wherein the borehole connects the surface of the earth with a subterranean formation containing a highly corrosive fluid.
Claim 4
Dependent Claim
23 words
The method as defined in claim 1 wherein the metal pipe is dissolved away by a corrosive fluid normally transported through the casing.
Claim 5
Dependent Claim
25 words
The method as defined in claim 1 wherein the metal pipe is substantially completely dissolved away prior to the transportation of said corrosive fluid therethrough.
Claim 6
Dependent Claim
14 words
The method as defined in claim 1 wherein the coating material is a resin.
Claim 7
Dependent Claim
16 words
The method as defined in claim 5 wherein the coating material also contains a fibrous reinforcement.
Claim 8
Dependent Claim
19 words
The method as defined in claim 1 wherein the coating material is a resin reinforced with a fibrous material.
Claim 9
Dependent Claim
17 words
The method as defined in claim 1 wherein the coatIng is a filament wound fibrous reinforced resin.
References Cited (Backward Citations)
US3055424A
Cited
US3220437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |