US3636762A
Expired / Lapsed
US
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Reservoir test
Assignee: Shell USA Inc
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Filing: 1970-05-21
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Granted: 1972-01-25
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Expires: 1990-05-21
Abstract
Abstract A method for measuring reservoir properties including skin factor and permeability thickness product of a porous earth formation with respect to injected fluid around a fluid injection well by rapidly increasing the rate of fluid injection to a new higher rate, maintaining injection substantially constant at this higher rate, and recording the variation with time of the fluid injection pressure as the injection rate is held substantially constant.
Inventors
- 👤 Chiang-Hai Kuo
- 👤 Ronald P Nordgren
- 👤 John P Vogiatzis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:11
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/008
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
113 words
A method for measuring a reservoir property of a porous earth formation penetrated by a well, the method comprising the steps of: injecting a fluid into the reservoir through said well at an initial fluid injection rate and under a fluid injection pressure; rapidly increasing the fluid injection rate from the initial fluid injection rate to a higher test-injection rate; maintaining the fluid injection rate substantially constant at said higher test-injection rate; and, measuring the fluid injection pressure as it varies with time while continuing to maintain said fluid injection rate substantially constant at said higher test-injection rate at least until pressure changes according to a linear function of the logarithm of time.
Claim 2
Independent Claim
113 words
A method for measuring a reservoir property of a porous earth formation penetrated by a well, the method comprising the steps of: injecting a fluid into the reservoir through said well at an initial fluid injection rate and under a fluid injection pressure; rapidly increasing the fluid injection rate from the initial fluid injection rate to a higher test-injection rate; maintaining the fluid injection rate substantially constant at said higher test-injection rate; and, measuring the fluid injection pressure as it varies with time while continuing to maintain said fluid injection rate substantially constant at said higher test-injection rate at least until pressure changes according to a linear function of the logarithm of time.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein the reservoir property to be measured is the permeability thickness product of the formation with respect to injected fluid.
Claim 4
Dependent Claim
36 words
The method of claim 2 including the step of first shutting in the well for a period sufficient to allow the bottom hole pressure in the well to become substantially equal to the average reservoir pressure.
Claim 5
Dependent Claim
16 words
The method of claim 1 wherein the reservoir property to be measured is the skin factor.
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein the initial fluid injection rate is zero.
Claim 7
Dependent Claim
11 words
The method of claim 1 wherein the fluid injected is water.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |