Patent US3662828A successfully refreshed from Google Patents.
US3662828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Through tubing well cleanout method using foam
Assignee: Chevron USA Inc
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Filing: 1970-09-11
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Granted: 1972-05-16
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Expires: 1990-09-11
Abstract
Abstract A method of cleaning out a well having a production tubing located therein without removing the production tube from the well by providing a flushing tube inside the production tube, generating pre-formed foam having a liquid volume to gas volume ratio in the range of from 0.05 to 0.1, injecting said foam into the flushing tube and down the well at a pressure within the range of from 350 to 1,000 or more psi and circulating the foam up the annulus between the production tube and the flushing tube while maintaining the annular velocity of the foam within the range of from 600 to 1,000 feet per minute.
Inventors
- 👤 Stanley O Hutchison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:33
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/14; E21B37/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
118 words
A method of removing sand or other undesirable material from a well, said well having a casing and a production tubing located therein, without removing the production tube from the well comprising the steps of positioning a flushing tube inside a production tube to form an annular passage between said flushing tube and said production tube, forming a pre-formed foam having a liquid volume/gas volume ratio between 0.05 and 0.1, injecting said foam down said well through said flushing tube at a pressure of at least 350 psi and circulating said foam up the annulus between said flushing tube and said production tube while maintaining the annular velocity in said annulus between 600 and 1,000 feet per minute.
Claim 2
Independent Claim
118 words
A method of removing sand or other undesirable material from a well, said well having a casing and a production tubing located therein, without removing the production tube from the well comprising the steps of positioning a flushing tube inside a production tube to form an annular passage between said flushing tube and said production tube, forming a pre-formed foam having a liquid volume/gas volume ratio between 0.05 and 0.1, injecting said foam down said well through said flushing tube at a pressure of at least 350 psi and circulating said foam up the annulus between said flushing tube and said production tube while maintaining the annular velocity in said annulus between 600 and 1,000 feet per minute.
Claim 3
Dependent Claim
24 words
The method of claim 1 further characterized in that the annular velocity of the foam is maintained between 800 to 1,000 feet per minute.
Claim 4
Dependent Claim
21 words
The method of claim 1 further characterized in that the injection pressure of the foam is between 350 and 1,000 psi.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |