Method and sensor for gas monitoring in well environment

FIELD: method and sensor for gas monitoring in well environment.

SUBSTANCE: method involves providing infrared light-emitting diode in well; transmitting corresponding infrared signals to the first optical path extending from the diode through well gas sample and the second optical path extending from the diode through gas sample; detecting transmitted infrared signals and determining concentration of component in well gas sample from detected signals. The first optical path is free of liquid.

EFFECT: increased accuracy of gas monitoring.

36 cl, 4 ex, 19 dwg

 

The text descriptions are given in facsimile form.

1. The method of gas monitoring in the environment of the borehole, comprising the following steps:

ensuring the well infrared LEDs;

the operation of the specified diode for transmission of the corresponding infrared signal on the first optical path extending from the diode, through the sample downhole gas, and a second optical path extending from the diode through the reference gas sample, the first optical path is free from liquid the tee;

detection of transmitted infrared signals; and

determining the concentration of the component in the sample downhole gas detektivami signals.

2. The method according to claim 1, which further comprises filtering the sample downhole gas to remove liquid.

3. The method according to claim 1, which additionally comprises removing a sample of the downhole gas from the fluid bore in which the gas is dissolved or dispersed, by transport of dissolved or dispersed gas through the gas-permeable membrane, and the sample extracted downhole gas is free from liquid.

4. The method according to any of the preceding paragraphs, in which the led operates in the reverse bias mode.

5. The method according to claim 1, wherein the led is an led operating in the middle infrared region.

6. The method according to claim 1, wherein said component is a CO2.

7. The method according to claim 1, wherein said component is a CH4.

8. The method according to claim 1, wherein said component is an H2S.

9. The method according to claim 1, wherein the led has a wavelength of peak emission in the range of 2 to 5 μm at 140°C.

10. The method according to claim 1, in which the reference gas sample contains a given concentration of the specified components is the same.

11. The method according to claim 1, wherein the second optical path has a zero optical density at the wavelength of emission of the diode.

12. The method according to claim 1, in which the led is operated for the transmission of additional infrared signal to the third optical path extending from the diode, while the third optical path has a certain optical density at the wavelength of emission of the diode.

13. The method according to item 12, in which a certain optical density is equal to zero.

14. The method according to claim 1, in which the length of the first optical path is set or selected in accordance with the predicted concentration of the specified component.

15. The method according to claim 1, in which the length of the first optical path is less than 1 mm.

16. The method according to claim 1, in which is provided a set of infrared light-emitting diodes, each diode is adapted for use in the appropriate temperature range, and diodes selectively operate in accordance with the temperature in the well.

17. The method according to claim 1, in which the first optical path includes an optical fiber that passes through the sample downhole gas, the infrared signal on the first optical path is transmitted along the optical fiber via total internal reflection.

18. The method according to claim 1, wherein a set of corresponding photodiode detectors is provided for the children is the pit of transmitted infrared signals.

19. A sensor for monitoring gas in the environment of the well, containing

infrared led;

Department for the content of the reference gas sample;

means of detection for detecting the corresponding infrared signals transmitted on the first and second optical path extending from the diode, where the first optical path crosses when using the sample downhole gas, the second optical path intersects the specified branch, and the sensor is constructed in such a way that when using the first optical path is free of fluid; and

a processor for determining the concentration of a component in the sample downhole gas detektivami signals.

20. The sensor according to claim 19, which further comprises a filter for filtering the sample downhole gas to remove liquid.

21. The sensor according to claim 19, which further comprises a gas-permeable membrane, and the sample downhole gas is extracted from the borehole fluid, in which the gas is dissolved or dispersed, by transport of dissolved or dispersed gas through the membrane, while the extracted sample downhole gas is free from liquid.

22. Sensor according to any one of p-21, which additionally contains

transparent or reflecting infrared is Opticheskie device on the first optical path, the device limits the sample downhole gas; and

ultrasonic cleaner for removing liquid from the surface of the device so that the first optical path is maintained free of fluid.

23. The sensor according to claim 19, in which the led is an led operating in the middle infrared region.

24. The sensor according to claim 19, in which the led has a peak wavelength of emission, in the range of 2 to 5 μm at 140°C.

25. The sensor according to claim 19, in which the detection means are placed to detect additional infrared signal transmitted on the third optical path extending from the led, while the third optical path has a certain optical density at the wavelength of emission of the diode.

26. The sensor A.25, in which a certain optical density is equal to zero.

27. The sensor according to claim 19, in which the length of the first optical path is set or selected in accordance with the predicted concentration of these components.

28. The sensor according to claim 19, in which the length of the first optical path is less than 1 mm.

29. The sensor according to claim 19, which further comprises a set of infrared light-emitting diodes, each diode has a capability of functioning in the appropriate temperature range, and the diodes are selectively according to the temperature in the well.

30. The sensor according to claim 19, which further comprises a light guide, which passes through the sample downhole gas, the infrared signal on the first optical path is transmitted along the optical fiber via total internal reflection.

31. The sensor according to item 30, which further comprises an ultrasonic cleaner for removing liquid from the surface of the light guide, so that the first optical path is maintained free of fluid.

32. The sensor according to claim 19, in which the means of detecting contain many relevant photodiode detectors for detecting the transmitted infrared signals.

33. The sensor according to claim 19, which is placed in the well.

34. The downhole tool containing a sensor according to any one of p-32.

35. The downhole tool 34, which is a tool for geophysical research in the production well.

36. The downhole tool 34, which is a descent tool for sampling.



 

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