Patent US3750768A successfully refreshed from Google Patents.
US3750768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil base drilling fluid filtrate-effected sand consolidation
Assignee: Shell USA Inc
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Filing: 1972-01-27
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Granted: 1973-08-07
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Expires: 1992-01-27
Abstract
Abstract A permeable water-containing earth formation is consolidated while a borehole is being drilled into that formation by circulating as a drilling fluid an oil solvent solution containing a mixture of an epoxide and imine that forms an epoxy resin when mixed with water and a suspension of finely divided solid particles that forms a filter-cake permitting a selected amount of filtrate invasion into a permeable earth formation.
Inventors
- 👤 G Suman
- 👤 E Richardson
- 👤 R Scheuerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:09
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/003; C; C09; C09K; C09K8/00; C09K8/02; C09K8/32
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
28 words
A process of claim 1 in which the solvent components of said oil solvent solution comprise a mixture of aliphatic and aromatic hydrocarbons that predominates in aromatic hydrocarbons.
Claim 2
Dependent Claim
41 words
The process of claim 1 in which said oil-base drilling fluid is formulated near a drilling site and the composition of a drilling fluid being circulated while drilling a borehole is altered to provide said circulation of an oil-base drilling fluid.
Claim 3
Dependent Claim
60 words
The process of claim 1 in which: said drilling into a permeable water-containing earth formation is interrupted while the borehole reaches an upper portion of an unconsolidated water-containing earth formation; and a slug of said oil-base drilling fluid having a volume sufficient to permeate a selected relatively extensive portion of said unconsolidated earth formation is injected into the earth formation.
References Cited (Backward Citations)
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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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |