Patent US3791448A successfully refreshed from Google Patents.
US3791448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well completion method
Assignee: Atlantic Richfield Co
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Filing: 1972-12-11
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Granted: 1974-02-12
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Expires: 1992-12-11
Abstract
Abstract A downhole well tool having at least one aperture therein for communication between the interior and exterior thereof and means for sealably opening and closing said aperture, the means for opening said aperture having means for receiving an opening plug, the opening plug being adapted to receive a bypass wiper, and the means for closing the aperture being adapted to receive a shutoff plug. A well completion method utilizing the tool above-described wherein residual liquid outside the tool is removed by passing a second liquid into the interior of the tool, through the aperture of the tool, and up the annulus between the tool and the wellbore. The second liquid is followed by a third liquid. The third liquid is displaced into said annulus through said aperture by cement, after which the tool is closed.
Inventors
- 👤 F Schuh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:11
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/008; E21B33/00; E21B33/10; E21B33/13; E21B33/14; E21B33/16; Y; Y10; Y10S; Y10S166/00; Y10S166/901
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
142 words
A well completion method in a wellbore comprising placing a string of casing in said wellbore, said casing having at an intermediate point along the length thereof a tool which can be opened to establish communication at the tool between the inside and outside of said casing and then closed to terminate such communication, said casing and tool containing a first liquid, placing cement below said tool, opening said tool, washing residual first liquid out of the interior of said casing and tool with second liquid, displacing remaining second liquid from the interior of saiD casing and tool with a third liquid, said second liquid weighing less per unit volume than said first liquid, said third liquid weighing no more per unit volume than said first liquid, displacing said third liquid from said casing and tool with cement, and closing said tool.
Claim 2
Dependent Claim
142 words
A well completion method in a wellbore comprising placing a string of casing in said wellbore, said casing having at an intermediate point along the length thereof a tool which can be opened to establish communication at the tool between the inside and outside of said casing and then closed to terminate such communication, said casing and tool containing a first liquid, placing cement below said tool, opening said tool, washing residual first liquid out of the interior of said casing and tool with second liquid, displacing remaining second liquid from the interior of saiD casing and tool with a third liquid, said second liquid weighing less per unit volume than said first liquid, said third liquid weighing no more per unit volume than said first liquid, displacing said third liquid from said casing and tool with cement, and closing said tool.
Claim 3
Dependent Claim
30 words
A method according to claim 1 wherein said first liquid is a water-base drilling fluid which is heavier than said third liquid, and said third liquid is an oil-base liquid.
Claim 4
Dependent Claim
19 words
A method according to claim 2 wherein said second liquid is water and is lighter than said third liquid.
Claim 5
Dependent Claim
22 words
A method according to claim 3 wherein said third liquid contains a freezing point depressant for transfer to any remaining second liquid.
Claim 6
Dependent Claim
31 words
A method according to claim 2 wherein said third liquid contains an oil-wetting agent to render metal parts in said wellbore preferentially oil wet to prevent leaving an aqueous film thereon.
Claim 7
Dependent Claim
21 words
A method according to claim 1 wherein said second liquid contains a thinner for decreasing the viscosity of said first liquid.
Claim 8
Dependent Claim
18 words
A method according to claim 1 wherein a bypass wiper is employed between said second and third liquids.
Claim 9
Dependent Claim
27 words
A method according to claim 1 wherein said third liquid is more viscous than said second liquid, and said third liquid is lighter than said first liquid.
Claim 10
Dependent Claim
26 words
A method according to claim 1 wherein said third liquid is lighter than said first liquid, and said second liquid is lighter than said third liquid.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |