US3782466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonding casing with syntactic epoxy resin
Assignee: Shell USA Inc
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Filing: 1972-07-19
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Granted: 1974-01-01
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Expires: 1992-07-19
Abstract
Abstract In a well in which a movement of earth formation material is apt to collapse a casing, an improved bond between the casing and the sur-rounding earth formations is formed by a syntactic epoxy resin foam that collapses progressively and has a compressive strength slightly less than that of the casing.
Inventors
- 👤 Lawson J Brown
- 👤 E Richardson
- 👤 G Suman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:57
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/14; C; C09; C09K; C09K8/00; C09K8/42
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
186 words
In completing a well by forming a fluid-tight and mechanically strong bond between a casing string and adjacent earth formations, an improved process for increasing the endurance of such bond in a region that contains subterranean faults, which improved process comprises: determining the depth of a fault zone encountered by the borehole of the well; positioning within the borehole of a well a casing string that has a known compressive strength at each depth; adjusting the composition of a liquid self-curing syntactic epoxy resin foam formulation to the extent required to cause it to produce a cured resin having a compressive strength slightly less than the compressive strength of the portion of the casing strength that is positioned adjacent to said fault zone; forming a bond between the casing string and adjacent earth formations in said fault zone by emplacing and curing the strength-adjusted resin foam formulation along the portion of said fault zone encountered by the well and emplacing; and forming a bond between the casing string and adjacent earth formations in other portions of the well by emplacing and curing cement in those portions.
Claim 2
Dependent Claim
186 words
In completing a well by forming a fluid-tight and mechanically strong bond between a casing string and adjacent earth formations, an improved process for increasing the endurance of such bond in a region that contains subterranean faults, which improved process comprises: determining the depth of a fault zone encountered by the borehole of the well; positioning within the borehole of a well a casing string that has a known compressive strength at each depth; adjusting the composition of a liquid self-curing syntactic epoxy resin foam formulation to the extent required to cause it to produce a cured resin having a compressive strength slightly less than the compressive strength of the portion of the casing strength that is positioned adjacent to said fault zone; forming a bond between the casing string and adjacent earth formations in said fault zone by emplacing and curing the strength-adjusted resin foam formulation along the portion of said fault zone encountered by the well and emplacing; and forming a bond between the casing string and adjacent earth formations in other portions of the well by emplacing and curing cement in those portions.
Claim 3
Dependent Claim
15 words
The process of claim 1 in which said resin formulation is a diafoam resin formulation.
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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |