US3746089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing multiple zone oil and gas wells
Assignee: Dresser Industries Inc
•
Filing: 1971-07-19
•
Granted: 1973-07-17
•
Expires: 1991-07-19
Abstract
Abstract Two or more oil and gas zones are produced by allowing production from at least one zone to drain down to a common chamber where production from the zones is comingled and lifted to the earth''s surface. A separate gas vent is provided for each zone to the earth''s surface.
Inventors
- 👤 N Vencil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:39
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/14; E21B33/00; E21B33/10; E21B33/12; E21B33/122; E21B43/12; E21B43/121; E21B43/122
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
181 words
In dual zone well production apparatus: a well casing passing through upper and lower producing zones in a well bore; said casing having upper and lower openings through which production from said upper and lower zones can flow, respectively, into the well casing; barrier means in said casing between said upper and lower openings; said barrier means having a longitudinal passage; a first tubular string extending to the top of the well bore and through said passage in said barrier means; chamber means below said barrier means, said chamber means communicating with said lower zone and connected to and communicating with said first tubular string for conducting fluid in the lower zone to said first tubular string; a second tubular string extending from above said barrier to below said barrier, and surrounding said first tubular string forming an annulus therebetween, said second tubular string communicating with said upper zone and with said chamber for conducting fluid from said upper zone to said chamber through said annulus; and means for lifting fluid from said chamber to the top of the well bore.
Claim 2
Dependent Claim
181 words
In dual zone well production apparatus: a well casing passing through upper and lower producing zones in a well bore; said casing having upper and lower openings through which production from said upper and lower zones can flow, respectively, into the well casing; barrier means in said casing between said upper and lower openings; said barrier means having a longitudinal passage; a first tubular string extending to the top of the well bore and through said passage in said barrier means; chamber means below said barrier means, said chamber means communicating with said lower zone and connected to and communicating with said first tubular string for conducting fluid in the lower zone to said first tubular string; a second tubular string extending from above said barrier to below said barrier, and surrounding said first tubular string forming an annulus therebetween, said second tubular string communicating with said upper zone and with said chamber for conducting fluid from said upper zone to said chamber through said annulus; and means for lifting fluid from said chamber to the top of the well bore.
Claim 3
Dependent Claim
53 words
Apparatus according to claim 1 further comprising: a second passage in said barrier means and communicating with said lower zone; and a third tubular string communicating with said second passage and extending to the top of the well bore for conducting gas from the lower zone to the top of the well bore.
Claim 4
Dependent Claim
180 words
In dual zone well production apparatus adapted to be set in a well casing passing through upper and lower producing zones in a well bore, the casing having upper and lower openings through which production from the upper and lower zones can flow, respectively, into the well casing, the apparatus comprising: barrier means in the casing between the upper and lower openings; said barrier means laving a longitudinal passage; a first tubular string extending to the top of the well bore and through said passage in said barrier means; chamber means below said barrier means, said chamber means communicating with said lower zone and connected to and communicating with said first tubular string; a second tubular string extending from above said barrier to below said barrier and surrounding said first tubular string forming an annulus therebetween, said second tubular string communicating with said upper zone and with said chamber means for conducting fluid from said upper zone to said chamber means through said annulus; and means for lifting fluid from said chamber means to the top of the well bore.
Claim 5
Dependent Claim
180 words
In dual zone well production apparatus adapted to be set in a well casing passing through upper and lower producing zones in a well bore, the casing having upper and lower openings through which production from the upper and lower zones can flow, respectively, into the well casing, the apparatus comprising: barrier means in the casing between the upper and lower openings; said barrier means laving a longitudinal passage; a first tubular string extending to the top of the well bore and through said passage in said barrier means; chamber means below said barrier means, said chamber means communicating with said lower zone and connected to and communicating with said first tubular string; a second tubular string extending from above said barrier to below said barrier and surrounding said first tubular string forming an annulus therebetween, said second tubular string communicating with said upper zone and with said chamber means for conducting fluid from said upper zone to said chamber means through said annulus; and means for lifting fluid from said chamber means to the top of the well bore.
Claim 6
Dependent Claim
53 words
Apparatus according to claim 3 further comprising: a second passage in said barrier means and communicating with said lower zone; and a third tubular string communicating with said second passage and extending to the top of the well bore for conducting gas from the lower zone to the top of the well bore.
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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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |