Patent US4852967A successfully refreshed from Google Patents.
Patent US3712129A successfully refreshed from Google Patents.
US3712129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simplified wellbore pressure testing apparatus
Assignee: Cities Service Oil Co
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Filing: 1970-06-02
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Granted: 1973-01-23
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Expires: 1990-06-02
Abstract
Abstract A length of microtubing is strung from the surface to the bottom of a well string during well completion and sealed at the surface by a valve. Pressure is recorded as desired by regulation of a pressurized gas, metered by a microflow mechanism, into the microtubing so that a predetermined flow of gas is continuously bubbled from the exit of the microtubing at the bottom of the well. A pressure gauge may be attached to the microtubing at the surface so as to measure the shut-in or flowing pressure of the well. The injected gas is of a known density so that a correction for the flowing head can be made to accurately determine the bottomhole pressure.
Inventors
- 👤 V Rhoades
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:22
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
Apparatus for the measurement of bottomhole pressure in free flowing, pumping and static fluid wells which comprises: a. a well having a bottomhole pressure greater than the normal hydrostatic pressure of said well; b. a tubing string extending from the surface to a depth within said well; c. a packer connected to said tubing string; d. a length of microtubing fastened to said tubing string and extending from the surface to a depth below said packer; e. means for supplying and regulating a fluid under pressure to said micro-tubing; f. means for recording the bottomhole pressure in said microtubing.
Claim 2
Dependent Claim
99 words
Apparatus for the measurement of bottomhole pressure in free flowing, pumping and static fluid wells which comprises: a. a well having a bottomhole pressure greater than the normal hydrostatic pressure of said well; b. a tubing string extending from the surface to a depth within said well; c. a packer connected to said tubing string; d. a length of microtubing fastened to said tubing string and extending from the surface to a depth below said packer; e. means for supplying and regulating a fluid under pressure to said micro-tubing; f. means for recording the bottomhole pressure in said microtubing.
Claim 3
Dependent Claim
50 words
The apparatus of claim 6 in which the means for supplying and regulating a fluid comprises: a. a pressurized gas cylinder; and b. a pressure regulator having the high pressure side of the regulator connected to the pressurized gas cylinder and the low pressure side connected to the microflow valve.
Claim 4
Dependent Claim
20 words
The apparatus of claim 2 in which the means for recording the pressure in the microtubing is a pressure gauge.
Claim 5
Dependent Claim
21 words
The apparatus of claim 2 in which the means for recording the pressure in the microtubing is an electronic pressure transducer.
Claim 6
Dependent Claim
35 words
The apparatus of claim 1 in which said quick release means comprises a quick release connector valve attached to the means for supplying and regulating a fluid and means for recording the pressure are connected.
Claim 7
Dependent Claim
39 words
The apparatus of claim 1 further comprising a quick release connector valve attached to said micro-tubing at the surface to which the microflow valve, means for supply and regulating a fluid and means for recording the pressure are connected.
References Cited (Backward Citations)
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Cited
US2792709A
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US2791119A
Cited
US3475959A
Cited
FR1520557A
Cited
US3517553A
Cited
US3587316A
Cited
US3572121A
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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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |