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US3690167A
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Method for determining the reservoir properties of a formation
Assignee: Shell USA Inc
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Filing: 1970-01-14
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Granted: 1972-09-12
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Expires: 1990-01-14
Abstract
Abstract A method for testing a well bore hold extending into a subterranean hydrocarbon-bearing earth formation to obtain a quantitative determination of the reservoir properties of the formation by injecting a fluid containing a radioactive isotope tracer down the well borehole and into the formation at a substantially constant rate. The fluid injection is followed by an injection into the formation of the fluid without such a tracer also at a substantially constant rate. Formation fluids are then backflowed from the formation and out the well borehole at a substantially constant rate and the tracer concentration with time in the backflow formation fluids is measured at a plurality of substantially equally spaced intervals.
Inventors
- 👤 Curtis A Chase Jr
- 👤 Michael Prats
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:25
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/10; E21B47/11; E21B49/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
A method for testing a well borehole extending into a subterranean hydrocarbon-bearing earth formation to obtain a quantitative determination of the reservoir properties of the formation, said method comprising the steps of: injecting a fluid containing a tracer down said well borehole and into said formation at a substantially constant rate; following said injection of fluid containing a tracer with an injection of said fluid without said tracer at a substantially constant rate; backflowing formation fluids from said formation and out said well borehole at a substantially constant rate; and measuring the tracer concentration with time of said formation fluids being backflowed at a plurality of substantially equally spaced intervals.
Claim 2
Independent Claim
110 words
A method for testing a well borehole extending into a subterranean hydrocarbon-bearing earth formation to obtain a quantitative determination of the reservoir properties of the formation, said method comprising the steps of: injecting a fluid containing a tracer down said well borehole and into said formation at a substantially constant rate; following said injection of fluid containing a tracer with an injection of said fluid without said tracer at a substantially constant rate; backflowing formation fluids from said formation and out said well borehole at a substantially constant rate; and measuring the tracer concentration with time of said formation fluids being backflowed at a plurality of substantially equally spaced intervals.
Claim 3
Dependent Claim
40 words
The method of claim 1 including the step of injecting said fluid containing said tracer into said formation includes the step of injecting said fluid in a plurality of slugs each followed by a slug of fluid without said tracer.
Claim 4
Dependent Claim
33 words
The method of claim 2 wherein the step of injecting said fluid containing said tracer in a plurality of slugs includes the step of injecting said fluid containing said tracer in three slugs.
Claim 5
Dependent Claim
30 words
The method of claim 1 wherein the step of injecting a fluid containing a tracer includes the step of injecting tritiated water down said well borehole and into said formation.
References Cited (Backward Citations)
US3343408A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |