Claims
- 1. In an apparatus for pumping a liquid from a borehole in the earth, including at least a string of tubing from the surface to a selected depth in said borehole, electric motor means and pump means supported at the bottom end of said tubing, three phase alternating current electrical power supply means at the surface, and a multiple conductor cable, said cable connected to said power supply means at the surface end, and to said motor means at the bottom end of said cable;
- apparatus for use in combination with said multiple conductor cable to measure, in said borehole, at least one well parameter indicative of a condition contiguous to said motor and pump means and transmitting to the surface a signal representative of said at least one well parameter, comprising:
- (a) means at the surface for generating an intermediate frequency signal independent of said three phase alternating current electrical power supply means;
- (b) electrical coupling means at the surface for connecting said intermediate frequency signal to a circuit comprised of one conductor in said multiple conductor cable and a ground conductor means which is independent of said alternating current electrical power supply means;
- (c) downhole instrument package means positioned in said borehole and connected to said circuit, said downhole instrument package means including;
- (1) power supply means energized by said intermediate frequency signal;
- (2) at least one non-eddy current sensor means for sensing said at least one parameter;
- (3) means to create a low frequency signal as a function of said parameter which is of frequency lower than said intermediate frequency;
- (4) means to generate a high frequency carrier signal of frequency greater than said intermediate frequency signal,
- (5) means to modulate said carrier signal with said low frequency signal to create a modulated carrier signal;
- (6) coupling means to transmit said modulated carrier signal to said circuit;
- (d) means to demodulate said modulated carrier signal to reconstitute said low frequency signal; and
- (e) means to indicate said well parameter as a function of said low frequency signal.
- 2. The apparatus as in claim 1 in which said ground is said tubing.
- 3. The apparatus as in claim 1 and including at the surface electrical filter means to separate said intermediate frequency signal and said high frequency signal.
- 4. The apparatus as in claim 1 wherein each of said electrical coupling means and said downhole instrument package coupling means include a series capacitor means.
- 5. The apparatus as in claim 1 and including a plurality of parameter sensor means.
- 6. The apparatus as in claim 5 and including multiplex means to transmit a plurality of signals representative of each of said plurality of sensor means.
- 7. The apparatus as in claim 6 in which said multiplex means comprises a signal multiplexer means.
- 8. The apparatus as in claim 6 in which said signal multiplexer is means for time multiplexing.
- 9. The apparatus as in claim 1 in which said downhole instrument package comprises an assembly built integral with said motor, pump and tubing assembly.
- 10. In an apparatus for pumping a liquid from a deep borehole in the earth, including at least a string of tubing from the surface to a selected depth in said borehole, electric motor means and pump means driven by said motor means, supported at the bottom end of said tubing, three phase alternating current electrical power supply means at the surface of said borehole, and a multiple conductor cable, said cable connected to said power means at the surface end and to said motor means at said bottom end;
- the method of utilizing a circuit comprised of one of said multiple conductors and a ground conductor means which is separate from said alternating current electrical power supply means to convey at least one well parameter indicative of a condition contiguous to said motor and pump means, and to provide an indication of said parameter, comprising the steps of;
- (a) generating, at the surface, an intermediate frequency signal independent of said three phase alternating current electrical power supply means and coupling said intermediate frequency signal to said circuit;
- (b) in an instrument package having a power supply means at the bottom end of said cable utilizing said intermediate frequency signal to energize said power supply means;
- (c) sensing at least one well parameter and creating a low frequency signal as a function of said parameter which is of frequency lower than said intermediate frequency;
- (d) generating a high frequency carrier signal greater than said intermediate frequency signal;
- (e) modulating said carrier signal with said low frequency signal to create a resultant modulated carrier signal;
- (f) coupling said modulated carrier signal to said circuit;
- (g) at the surface, receiving said modulated carrier signal;
- (h) demodulating said modulated carrier signal; and
- (i) converting said demodulated signal to a display or indiction of said parameter.
- 11. Apparatus for sensing a wall parameter indicative of a condition contiguous to an electric motor at a selected depth in a well by using an electrically conductive circuit comprised of a separate ground conductor and one conductor of a multiple conductor cable whose primary purpose is to carry electrical current from a three phase alternating current electrical supply means to said motor, said multiple conductor cable, comprising:
- (a) means to generate a first frequency signal independent of said three phase alternating current electrical supply means and coupling said first frequency signal to said conductive circuit;
- (b) means to convey said first frequency signal from the surface of said well to an instrument package contiguous to said motor;
- (c) means to utilize said first frequency signal to energize a power supply in said instrument package;
- (d) non-eddy current means to sense said well parameter and to create a second frequency signal as function thereof;
- (e) means to create an electrical carrier signal of a third frequency greater than said second frequency signal;
- (f) means to modulate said carrier signal with second frequency signal, to create a modulated carrier signal;
- (g) means to couple said modulated carrier signal to said conductive circuit;
- (h) means to receive said modulated carrier signal;
- (i) means to display said demodulated signal as an indication of the magnitude of said parameter.
- 12. A method of sensing a well parameter indicative of a condition contiguous to an electric motor at a selected depth in a well by using an electrically conductive system including a separate ground conductor and one conductor of a multiple conductor cable whose primary purpose is to carry electrical current from a three phase alternating current electrical supply means to said motor, said multiple conductor cable, comprising the steps of:
- (a) generating a first frequency signal independent of said three phase alternating current electrical power supply means and coupling said first frequency signal to said conductive system;
- (b) conveying said first frequency signal from the surface of said well to an instrument package contiguous to said motor;
- (c) converting said first frequency signal to a power supply voltage in said instrument package;
- (d) non-eddy current sensing said well parameter and creating a second frequency signal that is lower than said frequency signal as function thereof;
- (e) creating a third frequency electrical carrier signal greater than said second frequency signal;
- (f) modulating said carrier signal with said second frequency signal, to create a modulated carrier signal;
- (g) coupling said modulated carrier signal to said conductive system;
- (h) receiving said modulated carrier signal;
- (i) demodulating said modulated carrier signal; and
- (j) displaying said demodulated signal as an indication of the magnitude of said parameter.
RELATED APPLICATION
This is a continuation-in-part of copending application Ser. No. 523,455 filed Aug. 15, 1983, now U.S. Pat. No. 4,620,189.
US Referenced Citations (22)
Non-Patent Literature Citations (3)
Entry |
TRW Reda Pumps-Brochure, Pressure and Temperature Sensing Instrument, p. 10. |
Centrilift Submersible Pumps-Byron Jackson and Borg-Warner PHD System-Brochure, Bulletin No. BJCP 64-113. |
LynerSentry System-Brochure, 1980. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
523455 |
Aug 1983 |
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