US3908453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for indicating at the surface the measurement of a downhole condition
Assignee: Individual
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Filing: 1973-10-24
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Granted: 1975-09-30
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Expires: 1993-10-24
Abstract
Abstract A sensor carried by a pipe string measures a downhole condition. After a delay, a signal is transmitted to the surface. The delay is proportional to the measurement and can be measured in time, in revolutions of the pipe string, or in the volume of fluid pumped during the delay.
Inventors
- 👤 John D Jeter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:29
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06; E21B47/02; E21B47/022; E21B47/0236; E21B47/12; E21B47/14; E21B47/18; E21B47/20; E21B47/24
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
110 words
Apparatus for measuring from the surface a downhole condition in a well bore witha pipe string positioned therein, comprising sensor means having a movable element that will assume a position responsive to the measurement of the downhole condition, means controllable from the surface for holding the movable element from movement, means providing a first signal that changes at a known rate from a preselected original value, means responsive to the position of the movable element providing a second signal proportional to the value of the downhole condition, means for comparing the two signals, and means for sending a signal to the surface when the two signals reach a preselected relationship.
Claim 2
Dependent Claim
110 words
Apparatus for measuring from the surface a downhole condition in a well bore witha pipe string positioned therein, comprising sensor means having a movable element that will assume a position responsive to the measurement of the downhole condition, means controllable from the surface for holding the movable element from movement, means providing a first signal that changes at a known rate from a preselected original value, means responsive to the position of the movable element providing a second signal proportional to the value of the downhole condition, means for comparing the two signals, and means for sending a signal to the surface when the two signals reach a preselected relationship.
Claim 3
Dependent Claim
17 words
The apparatus of claim 1 in which the movable element moves in response to variations in temperature.
Claim 4
Dependent Claim
31 words
The apparatus of claim 1 in which the means providing the first signal includes means for changing the value of the first signal at a given rate per unit of time.
Claim 5
Dependent Claim
34 words
The apparatus of claim 1 in which the means for providing the first signal includes means for changing the value of the first signal a given amount for each revolution of the drill string.
Claim 6
Dependent Claim
38 words
The apparatus of claim 1 in which the means for providing the first signal includes means for changing the value of the first signal at a rate proportional to the volume of fluid pumped through the drill string.
Claim 7
Dependent Claim
51 words
The apparatus of claim 1 in which the movable element of the sensor means includes a pendulum having a downwardly facing conical opening and a member movable along the longitudinal axis of the pipe string into the opening to the extent allowed thereby to measure the inclination of the well bore.
Claim 8
Dependent Claim
75 words
Apparatus for measuring from the surface a down-hole condition in a well bore with a pipe string positioned therein, comprising sensor means having a movable element that will assume a position responsive to the measurement of the down-hole condition, means controllable from the surface for holding the movable element from movement, from said position and means responsive to the position of the movable element for indicating at the surface the measurement of the downhole condition.
Claim 9
Dependent Claim
75 words
Apparatus for measuring from the surface a down-hole condition in a well bore with a pipe string positioned therein, comprising sensor means having a movable element that will assume a position responsive to the measurement of the down-hole condition, means controllable from the surface for holding the movable element from movement, from said position and means responsive to the position of the movable element for indicating at the surface the measurement of the downhole condition.
Claim 10
Dependent Claim
81 words
The apparatus of claim 7 in which the means for indicating at the surface the measurement of the downhole condition includes means providing a first signal that changes at a known rate from a preselected original value, means responsive to the position of the movable element providing a second signal proportional to the value of the downhole condition, means for comparing the two signals, and means for sending a signal to the surface when the two signals reach a preselected relationship.
Claim 11
Dependent Claim
31 words
The apparatus of claim 8 in which the means providing the first signal includes means for changing the value of the first signal at a given rate per unit of time.
Claim 12
Dependent Claim
34 words
The apparatus of claim 8 in which the means for providing the first signal includes means for changing the value of the first signal a given amount for each revolution of the drill string.
Claim 13
Dependent Claim
38 words
The apparatus of claim 8 in which the means for providing the first signal includes means for changing the value of the first signal at a rate proportional to the volume of fluid pumped through the drill string.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |