US3566970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of injecting treating liquids into well tubing
Assignee: Dresser Industries Inc
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Filing: 1969-02-13
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Granted: 1971-03-02
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Expires: 1989-02-13
Abstract
Abstract This disclosure is of a method of introducing liquids into well tubing. The tubing has an injection valve and a packer located below the injection valve and expanded into contact with the casing. The liquid to be introduced into the tubing and a gas are introduced into the tubing-casing annulus. The gas pressure forces the liquid into the tubing through the injection valve against the pressure of the production within the tubing. The gas pressure may be varied to compensate for variations in tubing pressure.
Inventors
- 👤 Morgan L Crow
- 👤 Robert W Mcqueen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:12
CPC Classifications
E; E21; E21B; E21B43/00; E21B41/00; E21B41/02; Y; Y10; Y10S; Y10S166/00; Y10S166/902
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
15 words
A method in accordance with claim 1 wherein the liquid includes a corrosion inhibiting chemical.
Claim 2
Dependent Claim
13 words
A method in accordance with claim 1 wherein the liquid includes an alcohol.
Claim 3
Dependent Claim
72 words
A method in accordance with claim 1 wherein the amount of liquid and gas introduced provides a liquid column extending to a level above the injection valve and substantially below the top of the tubing-casing annulus and a gas column extending from the top of said liquid column to the top of said annulus, whereby said gas Column insulates said tubing and prevents heat loss in the upper portion of said tubing.
Claim 4
Dependent Claim
46 words
A method in accordance with claim 4 with the additional step of: varying the pressure of the gas column in response to variations in tubing pressure whereby the pressure exerted at the valve by the combined liquid and gas columns compensates for variations in tubing pressure.
Claim 5
Dependent Claim
13 words
A method in accordance with claim 1 wherein the liquid includes a solvent.
Claim 6
Independent Claim
150 words
A method of injecting treating liquids into a case well with tubing placed therein having a normally closed differential pressure valve which opens when the pressure in the tubing-casing annulus exceeds the pressure in the tubing by a predetermined amount and a packer below the differential pressure valve expanded into contact with the casing comprising the steps of: introducing sufficient liquid into the tubing-casing annulus to fill said annulus up to the level above the inlet of the differential pressure valve and substantially below the top of the tubing-casing annulus; thereafter introducing gas into said annulus at a pressure sufficient to force a portion of said liquid through said valve into the tubing against the pressure in the tubing; and varying the gas pressure in response to variations in tubing pressure to maintain the liquid pressure at the valve sufficient to force the liquid through the valve into the tubing.
References Cited (Backward Citations)
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US2654436A
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US2889276A
Cited
US3193016A
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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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |