A downhole tool 10 includes means for detecting a downhole condition, a capacitor bank, and a sparker. The technique is particularly useful for detecting casing collars. As the tool is passed along the well bore 11, it detects collars 12. On each detection, a part of the capacitor bank is discharged
A downhole tool 10 includes means for detecting a downhole condition, a capacitor bank, and a sparker. The technique is particularly useful for detecting casing collars. As the tool is passed along the well bore 11, it detects collars 12. On each detection, a part of the capacitor bank is discharged through the sparker. This generates an acoustic pulse which is transmitted through the ground (wave 14) to detectors 15, 16. The movement of the tool 10 is also monitored by a movement detector 20. The position of the tool 10 is correlated with the positions of the collars 12 by a computer 22 fed via interfacing circuitry 21. If desired, the pulses may be coded by strength, number, time spacing, etc.
대표청구항▼
1. A downhole condition detection system, particularly for use in an oil well extending from a wellhead at a ground surface, including a downhole condition signalling apparatus comprising: a first detection means for detecting a downhole condition of the oil well and producing a signal representing
1. A downhole condition detection system, particularly for use in an oil well extending from a wellhead at a ground surface, including a downhole condition signalling apparatus comprising: a first detection means for detecting a downhole condition of the oil well and producing a signal representing the downhole condition,a sparker means responsive to the first detection means for converting the signal produced by the first detection means to an acoustic signal, anda capacitor bank chargeable with energy for operating the sparker means;the system further including a second detection means disposed at or near the ground surface for detecting the acoustic signal transmitted from the sparker means to indicate the downhole condition;wherein a movement detector is arranged at the ground surface for monitoring the position of the apparatus; andwherein a computer is provided for correlating the position of the apparatus with the acoustic signal detected by the second detection means. 2. The system of claim 1, wherein the first detection means produces the signal representing the presence of a downhole casing collar. 3. A downhole condition detection system, particularly for use in an oil well extending from a wellhead at a ground surface, including a downhole condition signalling apparatus comprising: a first detection means for detecting a downhole condition of the oil well and producing a signal representing the downhole condition,a sparker means responsive to the first detection means for converting the signal produced by the first detection means to an acoustic signal, anda capacitor bank chargeable with energy for operating the sparker means;the system further including a second detection means disposed at or near the ground surface for detecting the acoustic signal transmitted from the sparker means to indicate the downhole condition;wherein the second detection means is disposed at a position remote from the wellhead for detecting the acoustic signal transmitted from the sparker means through the ground. 4. The system of claim 3, wherein a movement detector is arranged at the ground surface for monitoring the position of the apparatus, and a computer is provided for correlating the position of the apparatus with the acoustic signal detected by the second detection means. 5. The system of claim 1, wherein the acoustic signal comprises a series of pulses. 6. The system of claim 5, wherein the series of pulses is coded by time spacing. 7. The system of claim 1, wherein a battery is provided for supplying energy to the capacitor bank. 8. The system of claim 7, wherein the capacitor bank is charged by a high voltage DC-DC converter powered by the battery. 9. The system of claim 1, wherein a time delay is provided between the detection of the downhole condition and the operation of the sparker means. 10. The system of claim 3, wherein the first detection means produces the signal representing the presence of a downhole casing collar. 11. The system of claim 3, wherein a time delay is provided between the detection of the downhole condition and the operation of the sparker means. 12. The system of claim 3, wherein the acoustic signal comprises a series of pulses. 13. The system of claim 12, wherein the series of pulses is coded by time spacing. 14. The system of claim 4, wherein a battery is provided for supplying energy to the capacitor bank. 15. The system of claim 14, wherein the capacitor bank is charged by a high voltage DC-DC converter powered by the battery.
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이 특허에 인용된 특허 (9)
Edwards Richard C. (Kennewick WA) Wilson Richard L. (Richland WA), Acoustical sparker probe apparatus.
Flowers, Joseph K.; Smith, Michael L.; Beckel, Jeffrey; Adnan, Sarmad; Leising, Lawrence J., Downhole fluid pressure signal generation and transmission.
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