US3749173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Displacement of drilling fluids from boreholes
Assignee: Schlumberger Technology Corp
•
Filing: 1972-05-30
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Granted: 1973-07-31
•
Expires: 1992-05-30
Abstract
Abstract A method is disclosed for displacing drilling muds from boreholes. In the method, an organic liquid, gelled with a metal salt of an aliphatic substituted orthophosphate ester, is pumped into the hole through the casing or annulus to force the drilling mud out through the annulus or casing.
Inventors
- 👤 D Hill
- 👤 C Smith
- 👤 C Kucera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:35
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; C09K8/528
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
24 words
The method of claim 1 wherein said organic liquid has a viscosity about equal to or greater than the viscosity of the drilling mud.
Claim 2
Dependent Claim
20 words
The method of claim 1 wherein said organic liquid is gelled with an aluminum salt of an alkyl orthophosphate ester.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein said driving fluid comprises a hydraulic cement slurry employed to cement said casing into said well bore.
Claim 4
Dependent Claim
24 words
The method of claim 4 wherein the density of the gelled organic liquid is about equal to the density of the hydraulic cement slurry.
Claim 5
Dependent Claim
31 words
The method of claim 1 wherein the drilling mud and gelled organic liquid are displaced from the well bore through the annulus space existing between the casing and the well bore.
Claim 6
Dependent Claim
63 words
In the method of removing a drilling fluid from, and packing a borehole the improvement which comprises: a. placing into the well bore and in contact with said drilling fluid an organic liquid which is gelled with a metal salt of an alkyl orthophosphate ester; b. displacing said drilling fluid from the borehole; and c. packing the borehole with said gelled organic liquid.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |