Patent US3930539A successfully refreshed from Google Patents.
US3930539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of obtaining increased production in wells
Assignee: Individual
•
Filing: 1975-05-08
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Granted: 1976-01-06
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Expires: 1995-05-08
Abstract
Abstract In order to increase the productivity of oil and gas wells, hydrochloric acid and phosphoric acid are pumped into the well. Thereafter, aqueous ammonia is forced into the bottom of the well by nitrogen under pressure. This produces a violent exothermic reaction in the formation around the bottom of the well which emulsifies the paraffin and disintegrates the limestone, so as to open the formation by forming large passages and cavities over large areas and distances, permitting the oil or gas to flow freely through the formation to the well bore.
Inventors
- 👤 Arvel C. Curtis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:17
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/84; C09K8/845; E; E21; E21B; E21B37/00; E21B43/00; E21B43/25; E21B43/26; E21B43/27
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
80 words
A process of treating oil or gas wells to increase the productivity thereof which comprises introducing into the bottom of the well a mixture of two acids which alone do not react vigorously with each other at normal temperatures and pressures and pumping into the bottom of the well an accelerator which produces in conjunction with the mixture of acids a violent exothermic reaction, thereby producing an expansion force and disintegrating the formation to form large cavities and passages therein.
Claim 2
Dependent Claim
80 words
A process of treating oil or gas wells to increase the productivity thereof which comprises introducing into the bottom of the well a mixture of two acids which alone do not react vigorously with each other at normal temperatures and pressures and pumping into the bottom of the well an accelerator which produces in conjunction with the mixture of acids a violent exothermic reaction, thereby producing an expansion force and disintegrating the formation to form large cavities and passages therein.
Claim 3
Dependent Claim
22 words
A process as claimed in claim 1, in which the acids are hydrochloric and phosphoric acids and the accelerator is aqueous ammonia.
Claim 4
Dependent Claim
20 words
A process as claimed in claim 2, in which the accelerator is forced into the well by nitrogen under pressure.
References Cited (Backward Citations)
US139010A
Cited
US1806499A
Cited
US2747672A
Cited
US3529666A
Cited
US3593793A
Cited
US3630281A
Cited
US3776312A
Cited
US3702635A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |