US3737843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically controlled device for modulating the mud
Assignee: Societe Nationale des Petroles dAquitaine SA
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Filing: 1971-12-09
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Granted: 1973-06-05
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Expires: 1991-12-09
Abstract
Abstract A hydraulically controlled device to transmit measurements taken at the bottom of a well to the surface, in the form of pressure modulations created by periodical restrictions on the passage of the drilling fluid, characterized by the use of a servovalve which operates the drilling fluid flow-restriction system, and the hydraulic control fluid of which is uniformly related, in quantity and direction, to the electric intensity passing through its coil.
Inventors
- 👤 J Lepeuvedic
- 👤 C Quichaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:18
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/12; E21B47/14; E21B47/18; E21B47/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
169 words
In a hydraulically controlled device for transmitting signals representing measurements taken within a well to the surface in the form of pressure modulations created by periodical restrictions on the flow of the drilling fluid, which device comprises a mechanism for restricting said flow, means for controlling said mechanism operated by electrical signals indicative of said measurements, a hydraulic fluid circuit by means of which said control means operates the flow-restricting mechanism, and a turbine driven by the drilling fluid, the improvement according to which: said device comprises a hydraulic fluid pressure pump to supply pressure fluid to said hydraulic circuit and an electrical generator, both driven by said turbine, and said control means comprises electrically operated servo valve means supplied from said generator for controlling the flow of hydraulic fluid in said circuit in dependence on the quantity and direction of the electrical signal delivered to the servo valve and means for regulating the electrical signal to said servo valve at least in part in dependence on said measurements.
Claim 2
Dependent Claim
169 words
In a hydraulically controlled device for transmitting signals representing measurements taken within a well to the surface in the form of pressure modulations created by periodical restrictions on the flow of the drilling fluid, which device comprises a mechanism for restricting said flow, means for controlling said mechanism operated by electrical signals indicative of said measurements, a hydraulic fluid circuit by means of which said control means operates the flow-restricting mechanism, and a turbine driven by the drilling fluid, the improvement according to which: said device comprises a hydraulic fluid pressure pump to supply pressure fluid to said hydraulic circuit and an electrical generator, both driven by said turbine, and said control means comprises electrically operated servo valve means supplied from said generator for controlling the flow of hydraulic fluid in said circuit in dependence on the quantity and direction of the electrical signal delivered to the servo valve and means for regulating the electrical signal to said servo valve at least in part in dependence on said measurements.
Claim 3
Dependent Claim
88 words
A device according to claim 1 in which said flow restriction mechanism comprises a mobile valve-needle cooperating with a fixed seat and attached to a double-action hydraulic jack piston mounted for movement between two positions, one of which corresponds to maximum opening of the flow-restricting mechanism and is obtained by passing an electric current in one direction through the servo valve coil, and the other of which corresponds to minimum opening of the flow-restricting mechanism and is obtained by passing current through said coil in the opposite direction.
Claim 4
Dependent Claim
78 words
A device according to claim 1 in which said control means comprises a sensor which emits an electrical signal indicative of a controlled functional characteristic of said restriction mechanism, a generator of signals related to said measurement signals, and an error detector delivering a signal equal to the difference between the signals emitted by said sensor and generator, and said servo valve comprises a control coil to which said difference signal is applied to control said functional characteristic.
Claim 5
Dependent Claim
19 words
A device according to claim 3 in which said sensor is responsive to the position of said flow-restricting mechanism.
Claim 6
Dependent Claim
27 words
A device according to claim 3 in which said sensor is a pressure difference sensor which measures the difference in pressure above and below said flow-restricting mechanism.
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |