Patent US3795142A successfully refreshed from Google Patents.
US3795142A
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US
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Temperature well logging
Assignee: BP America Production Co
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Filing: 1972-06-27
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Granted: 1974-03-05
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Expires: 1992-06-27
Abstract
Abstract This concerns a method of determining vertical locations of intervals receiving injection of a fluid in an injection or production well drilled through a subsurface formation. Fluid, having a bottomhole temperature at least about 5* different from the fluid normally injected or produced through the well, is injected for a period of time, e.g., about 3 - 6, or occasionally 24 hours. As soon as injection is stopped, a series of timespaced temperature logs are run in the well bore; preferably at intervals of not over 30 minutes. Temperature anomalies appearing in the logs indicate the injection zone or zones.
Inventors
- 👤 R Smith
- 👤 R Steffensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:35
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06; E21B47/07
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
158 words
A method of locating vertical intervals having fluid flow through an underground formation penetrated by a well bore used as a water injection well which comprises: a. injecting water into said formation, such water having a temperature at the depth in the well bore at the vertical interval of interest which is different from the formation temperature; b. thereafter interrupting said injection of water in step a) by shutting in said well for a period of time sufficient that the temperature of said water within the well bore is changed appreciably; c. applying pressure in the well bore to inject at least part of the water having a changed temperature from the well bore into said underground formation; d. again shutting in said well, and then e. running a series of time-spaced temperature logs in the well bore over the section of interest whereby temperature anomalies appearing in the logs will indicate the zones having fluid flow therethrough.
Claim 2
Independent Claim
158 words
A method of locating vertical intervals having fluid flow through an underground formation penetrated by a well bore used as a water injection well which comprises: a. injecting water into said formation, such water having a temperature at the depth in the well bore at the vertical interval of interest which is different from the formation temperature; b. thereafter interrupting said injection of water in step a) by shutting in said well for a period of time sufficient that the temperature of said water within the well bore is changed appreciably; c. applying pressure in the well bore to inject at least part of the water having a changed temperature from the well bore into said underground formation; d. again shutting in said well, and then e. running a series of time-spaced temperature logs in the well bore over the section of interest whereby temperature anomalies appearing in the logs will indicate the zones having fluid flow therethrough.
Claim 3
Dependent Claim
62 words
A method as defined in claim 1 in which in step a) the water injected is cooler than the temperature of the formation at the vertical interval of interest and in which step c) includes injecting water into the well at the surface at a temperature as least as hot as that attained by the water in the well during step c).
References Cited (Backward Citations)
US3709032A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |