US3712129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simplified wellbore pressure testing apparatus
Assignee: Cities Service Oil Co
•
Filing: 1970-06-02
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Granted: 1973-01-23
•
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 14:15
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)
US2832566A
Cited
US2792709A
Cited
US2791119A
Cited
US3475959A
Cited
FR1520557A
Cited
US3517553A
Cited
US3587316A
Cited
US3572121A
Cited
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 |