US3583489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well cleaning method using foam containing abrasives
Assignee: Chevron USA Inc
•
Filing: 1969-07-01
•
Granted: 1971-06-08
•
Expires: 1989-07-01
Abstract
Abstract A method of cleaning a well liner by contacting the well liner with a gas-liquid foam having entrained therein a quantity of abrasive particles so as to remove scale and other undesirable material from such liner.
Inventors
- 👤 Stanley O Hutchison
- 👤 John C Mckinnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:28
CPC Classifications
E; E21; E21B; E21B37/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
24 words
A method of claim 1 further characterized in that the abrading particles are sand having a diameter of less than one-eighth of an inch.
Claim 2
Dependent Claim
30 words
The method of claim 1 fUrther characterized in that the foam containing said particles is circulated past said well liner at a velocity of at least 25 feet per minute.
Claim 3
Dependent Claim
28 words
The method of claim 1 further characterized in that at least a portion of the foam containing said particles is jetted against the liner at substantially right angles.
Claim 4
Dependent Claim
23 words
The method of claim 1 further characterized in that at least a portion of said foam is directed through slots of the liner.
Claim 5
Dependent Claim
24 words
A method according to claim 1 wherein from one-half to 6 pounds of sand per gallon of foam solution is added to said foam.
References Cited (Backward Citations)
US3273643A
Cited
US2669809A
Cited
US3111178A
Cited
US3130798A
Cited
US3155178A
Cited
US3082073A
Cited
US3272650A
Cited
US3463231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |