US3633673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Through-tubing cementing method
Assignee: Baker Hughes Oilfield Operations LLC
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Filing: 1970-06-18
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Granted: 1972-01-11
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Expires: 1990-06-18
Abstract
Abstract The method of cementing a porous subsurface earth formation in which well-casing is set and perforated, wherein a body of cement slurry is displaced through the tubing, and a bridge plug is employed to close off the lower end of the tubing, following displacement of the cement slurry through the perforations.
Inventors
- 👤 Martin B Conrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:38
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/14; E21B33/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
180 words
The method of cementing a well bore in which a tubing string is disposed: introducing a body of cement slurry into said tubing string, said tubing string having an unrestricted bore extending from at least the point of introducing the cement slurry to the lowermost end of the tubing string, introducing a column of following fluid into said tubing string above said slurry, said column of following fluid having an arresting plug in said tubing string a predetermined distance above said cement slurry with a predetermined quantity of following fluid between said plug and cement slurry, the remainder of said following fluid being above said plug, forcing said column of following fluid down the tubing string to force said slurry from the lower end of said tubing string and into the well bore below said tubing string followed by said predetermined quantity of following fluid, and positively stopping said arresting plug in the lower end of said tubing string to prevent ejecting of the remainder of said following fluid in said tubing string above said plug into the well bore.
Claim 2
Independent Claim
180 words
The method of cementing a well bore in which a tubing string is disposed: introducing a body of cement slurry into said tubing string, said tubing string having an unrestricted bore extending from at least the point of introducing the cement slurry to the lowermost end of the tubing string, introducing a column of following fluid into said tubing string above said slurry, said column of following fluid having an arresting plug in said tubing string a predetermined distance above said cement slurry with a predetermined quantity of following fluid between said plug and cement slurry, the remainder of said following fluid being above said plug, forcing said column of following fluid down the tubing string to force said slurry from the lower end of said tubing string and into the well bore below said tubing string followed by said predetermined quantity of following fluid, and positively stopping said arresting plug in the lower end of said tubing string to prevent ejecting of the remainder of said following fluid in said tubing string above said plug into the well bore.
Claim 3
Dependent Claim
27 words
The method of claim 1, including placing a divider plug in the tubing string between said cement slurry and the fluid in advance of said cement slurry.
Claim 4
Dependent Claim
77 words
The method of claim 1, including placing a divider plug in the tubing string between said cement slurry and tHe fluid in advance of said cement slurry, and also placing a divider plug in the tubing string between said cement slurry and the following fluid behind said cement slurry, said last-mentioned divider plug being located in the tubing string a predetermined distance in advance of said arresting plug to confine said predetermined quantity of following fluid therebetween.
Claim 5
Dependent Claim
40 words
The method of claim 1 wherein said arresting plug is positively stopped in the lower end of said tubing string in response to emergence of the lower end of said arresting plug from the lower end of said tubing string.
Claim 6
Independent Claim
143 words
The method of cementing a well bore containing a well casing in which a tubing string is disposed: introducing a body of cement slurry into said tubing string, displacing said body of cement slurry downwardly in said tubing string by a column of following fluid above said cement slurry, forcing said cement slurry from the lower end of said tubing string and into the well casing below said tubing string, plugging the lower end of said tubing string to prevent further movement of said cement slurry into said well casing below the lower end of said tubing string, wherein said tubing string is plugged by placing a plug in the column of fluid a predetermined distance above said cement slurry, and anchoring said plug in said tubing string in response to emergence of the lower end of said plug from said tubing string.
Claim 7
Independent Claim
143 words
The method of cementing a well bore containing a well casing in which a tubing string is disposed: introducing a body of cement slurry into said tubing string, displacing said body of cement slurry downwardly in said tubing string by a column of following fluid above said cement slurry, forcing said cement slurry from the lower end of said tubing string and into the well casing below said tubing string, plugging the lower end of said tubing string to prevent further movement of said cement slurry into said well casing below the lower end of said tubing string, wherein said tubing string is plugged by placing a plug in the column of fluid a predetermined distance above said cement slurry, and anchoring said plug in said tubing string in response to emergence of the lower end of said plug from said tubing string.
Claim 8
Dependent Claim
21 words
The method of claim 5, including allowing said slurry to set up and then removing said plug from said tubing string.
Claim 9
Dependent Claim
22 words
The method of claim 5, including allowing said slurry to set up, and then retrieving said plug upwardly through said tubing string.
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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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |