US3653441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for cementing well bores
Assignee: Shell USA Inc
•
Filing: 1970-06-03
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Granted: 1972-04-04
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Expires: 1990-06-03
Abstract
Abstract A process for cementing well bores is disclosed wherein high viscosity drilling mud in the area to be cemented is displaced by a liquid slug which in turn is displaced by a lower viscosity cement. The leading edge of the liquid slug has a viscosity substantially equal to or greater than the viscosity of the drilling mud during displacement thereof. The viscosity of the trailing edge of the liquid slug is substantially equal to or lower than the viscosity of the cement during displacement of the liquid slug.
Inventors
- 👤 Robert N Tuttle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:27
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
42 words
The process of claim 1 wherein the liquid slug, viscosity modifying agent and cement slurry are injected, in seriatim, through the conduit into the bore hole, the liquid slug comprises a degradable liquid and the viscosity modifying agent comprises a degrading agent.
Claim 2
Dependent Claim
25 words
The process of claim 2 comprising the step of segregating the degradable liquid from the degrading agent until the degrading agent enters the bore hole.
Claim 3
Dependent Claim
24 words
The process of claim 2 wherein the drilling liquid is substantially displaced from the selected area before the degrading agent enters the bore hole.
Claim 4
Dependent Claim
32 words
The process of claim 2 further comprising the step of injecting a cement compatible liquid slug into the conduit between the degrading agent and the cement for preventing contamination of the cement.
Claim 5
Dependent Claim
21 words
The process of claim 2 wherein the degradable liquid comprises a high viscosity emulsion and the degrading agent comprises a de-emulsifier.
Claim 6
Dependent Claim
32 words
The process of claim 6 wherein the emulsion comprises an oil-in-water emulsion having a continuous water phase and a discontinuous phase including oil-wet, acid-soluble solid particles and the de-emulsifier comprises an acid.
Claim 7
Dependent Claim
66 words
The process of claim 1 wherein the liquid slug and cement slurry are injected, substantially in seriatim, through the conduit into the bore hole, the liquid slug comprises a multicomponent liquid capable of viscosity reduction by changing the proportion of the viscosity modifying agent and the adding step comprises changing the proportion of the viscosity modifying agent as the liquid slug is injected into the conduit.
Claim 8
Dependent Claim
20 words
The process of claim 8 wherein the multicomponent liquid is an oil-in-water emulsion and the viscosity modifying agent comprises oil.
Claim 9
Dependent Claim
21 words
The process of claim 9 wherein the emulsion comprises a continuous water phase and a discontinuous phase including oil-wet solid particles.
References Cited (Backward Citations)
US2151029A
Cited
US2326577A
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US2848051A
Cited
US3193010A
Cited
US3299952A
Cited
US3411580A
Cited
US3525397A
Cited
US3532168A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |