US3756076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device with independent hydraulic control to transmit measurements taken at the bottom of a well
Assignee: Societe Nationale des Petroles dAquitaine SA
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Filing: 1971-07-14
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Granted: 1973-09-04
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Expires: 1991-07-14
Abstract
Abstract A hydraulically controlled device to transit measurements taken at the bottom of a well to the surface, by means of pressure impulses created by periodical restrictions on the passage of the drilling fluid, consisting of means to control these restrictions, operated by electrical impulses, a hydraulic fluid circuit to operate the means restricting the passage of the drilling fluid, a turbine driven by the drilling fluid and a hydraulic fluid pump fixed on the same shaft, characterized by the fact that the said pump is placed in a hydraulic fluid circuit containing passages to discharge the fluid on either side of a double-action hydraulic jack, to which said restricting means is mechanically connected, and an accumulator is mounted in said circuit in parallel with said jack.
Inventors
- 👤 C Quichaud
- 👤 Peuvedic J Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:28
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/12; E21B47/14; E21B47/18; E21B47/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
153 words
A device for transmitting to the surface signals representing measurements supplied as electrical impulses by a measuring instrument located within a well, said signals consisting of pulses in the pressure of a drilling fluid in said well, which pulses are created by temporary restrictions in the flow of said fluid, said device comprising: means for restricting the flow of said fluid, a double-acting hydraulic jack connected to operate said restricting means, a turbine driven by said drilling fluid, a fluid pressure pump driven by said turbine, a hydraulic fluid circuit supplied by said pump and connected to apply the pressure produced by said pump to either side of said jack, means in said fluid circuit responsive to said electrical impulses for controlling the side of said jack to which pressure is applied, and a pressure accumulator comprising a spring-biassed piston connected in said hydraulic circuit in parallel with both said jack and pump.
Claim 2
Independent Claim
153 words
A device for transmitting to the surface signals representing measurements supplied as electrical impulses by a measuring instrument located within a well, said signals consisting of pulses in the pressure of a drilling fluid in said well, which pulses are created by temporary restrictions in the flow of said fluid, said device comprising: means for restricting the flow of said fluid, a double-acting hydraulic jack connected to operate said restricting means, a turbine driven by said drilling fluid, a fluid pressure pump driven by said turbine, a hydraulic fluid circuit supplied by said pump and connected to apply the pressure produced by said pump to either side of said jack, means in said fluid circuit responsive to said electrical impulses for controlling the side of said jack to which pressure is applied, and a pressure accumulator comprising a spring-biassed piston connected in said hydraulic circuit in parallel with both said jack and pump.
Claim 3
Dependent Claim
52 words
A device according to claim 1, comprising a fluid pressure limiter consisting of a needle-valve closing an aperture which connects the pump discharge and intake, said needle valve being subject to pressure loading in one direction by the discharge pressure of the pump and biassed in the opposite direction by spring means.
Claim 4
Dependent Claim
21 words
A device according to claim 2 comprising means for adjusting the pressure exerted on said needle valve by said spring means.
Claim 5
Dependent Claim
39 words
A device according to claim 1, in which the intake pressure of the hydraulic fluid pump is transmitted to one side of a movable piston, the other side of which is subject to the pressure of the drilling fluid.
Claim 6
Dependent Claim
39 words
A device according to claim 1, in which the means restricting the flow of the fluid is a needle-valve attached to the piston of said jack and cooperating with a suitable seat in the flow path of said fluid.
References Cited (Backward Citations)
US2964116A
Cited
US3302457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |