Dynamic monitoring and early warning device for underground gas concentration

Abstract

The utility model relates to a dynamic monitoring and early warning device for underground gas concentration. The dynamic monitoring and early warning device comprises an acquisition system and an analysis system, the acquisition system is mounted underground, and the analysis system is mounted on the ground; the acquisition system comprises a light source, a monochromator and a gas cell, the light source and the monochromator are located at the incident end of the gas cell, a transmission optical fiber is arranged at the emitting end of the gas cell, and the other end of the transmission optical fiber is connected with the analysis system; the analysis system includes a spectrometer. Gas is collected underground, an optical signal of an ultraviolet light absorption result is transmitted to the spectrograph on the ground through the transmission optical fiber, the optical signal can be stably transmitted through the transmission optical fiber, and compared with gas pipe transmission, the probability of numerical loss is low, so that the monitored result is more accurate. The whole gas collection process is carried out underground, gas is absorbed in situ and released in situ and cannot leak to the ground, and therefore the surrounding environment of an oil and gas well can be protected.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas well gas concentration monitoring technology, and in particular to a downhole gas concentration dynamic monitoring and early warning device. Background Technology

[0002] During the drilling and extraction of oil and gas wells, toxic gases, such as hydrogen sulfide, are often present. Hydrogen sulfide is highly toxic to humans and can also cause strong corrosion to steel structures. Therefore, it is necessary to monitor the concentration of toxic gases downhole to ensure the safety of personnel and equipment.

[0003] Taking hydrogen sulfide gas as an example, the traditional gas monitoring method is to use a gas pump to draw the sample gas into the machine room for monitoring. Since the machine room is far from the oil and gas well, the gas pipeline used for transmission is long. Hydrogen sulfide is toxic and is very easy to be adsorbed in the gas pump and pipeline. Hydrogen sulfide leakage can easily lead to poisoning of the staff in the machine room. Moreover, the concentration of hydrogen sulfide decreases after adsorption, resulting in lower measurement results.

[0004] In response, Chinese patent CN211785107U, entitled "Online Monitoring System for Low-Concentration Hydrogen Sulfide Gas," discloses a monitoring device configured at an oil and gas well station. This device obtains the on-site concentration result through ultraviolet light absorption and spectroscopy analysis, and then sends a signal to the control room. This eliminates the need for a gas pipe connected to the control room, reducing pipe length and solving the problems of low detection concentration due to adsorption within the gas pipe and gas leakage within the control room. However, the drilling depth of oil and gas wells is sometimes no less than the distance from the well to the control room. Therefore, the underground portion of the gas pipe remains long, and adsorption within the underground portion can still lead to lower final measurement results. Furthermore, leaks in the surface gas pipe can still cause pollution to the surrounding environment. Utility Model Content

[0005] The purpose of this application is to provide a downhole gas concentration dynamic monitoring and early warning device, which aims to solve the problems existing in the prior art.

[0006] This application provides a downhole gas concentration dynamic monitoring and early warning device, including a data acquisition system and an analysis system. The data acquisition system is installed downhole, and the analysis system is installed on the surface. The data acquisition system includes a light source, a monochromator, and a gas cell. The light source and monochromator are located at the incident end of the gas cell, and a transmission optical fiber is provided at the exit end of the gas cell. The other end of the transmission optical fiber is connected to the analysis system. The analysis system includes a spectrometer.

[0007] An inlet pipe is installed on the gas pool near the injection end, and a gas filter and a gas flow regulator are installed on the inlet pipe; an outlet pipe is installed on the gas pool near the injection end, and an air pump is installed on the outlet pipe. The gas pool is elongated, with one end of its length being the injection end and the other end being the injection end.

[0008] The acquisition system is externally housed in a casing, inside which a battery is installed that connects to the light source, air pump, and flow regulator.

[0009] The analysis system also includes a processor, which is electrically connected to the spectrometer, and the processor is connected to an alarm.

[0010] The light source is a deuterium lamp.

[0011] The beneficial effects of this invention are as follows: This invention collects gas underground and transmits the light signal from the ultraviolet light absorption results to a spectrometer on the ground via a transmission optical fiber. The transmission optical fiber can stably transmit the light signal, and compared with gas pipe transmission, the probability of numerical loss is low, thus the monitoring results are more accurate. The entire gas collection process is carried out underground, with in-situ absorption and release of gas, preventing leakage to the surface, thereby protecting the environment surrounding the oil and gas well. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the data acquisition system of this utility model.

[0013] Figure 2 This is a schematic diagram illustrating the principle of this utility model.

[0014] In the picture:

[0015] 1. Light source; 2. Monochromator; 3. Gas cell; 4. Transmission fiber; 5. Inlet pipe; 6. Gas filter; 7. Gas flow regulator; 8. Outlet pipe; 9. Air pump; 10. Housing; 11. Battery. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] like Figure 1 and Figure 2 The device shown is a downhole gas concentration dynamic monitoring and early warning system, comprising a separate acquisition system and an analysis system. The acquisition system is installed inside the underground oil and gas well, while the analysis system is installed on the surface.

[0018] Specifically, the acquisition system includes a light source 1, a monochromator 2, and a gas cell 3. The light source 1 is a deuterium lamp, emitting ultraviolet light. The ultraviolet light emitted from the light source 1 is stabilized by the monochromator 2. The gas cell 3 is elongated, preferably a long cylindrical shape. One end of the gas cell 3 is the incident end, and the other end is the exit end. The light source 1 and monochromator 2 are located at the incident end of the gas cell 3, and a transmission optical fiber 4 is installed at the exit end of the gas cell 3. The transmission optical fiber 4 is used to receive the ultraviolet light absorbed by the gas. The other end of the transmission optical fiber 4 is connected to the analysis system, transmitting the acquired ultraviolet light to the analysis system.

[0019] The analysis system includes a spectrometer and a processor. The processor is electrically connected to the spectrometer and has a signal connection to an alarm. The processor processes the analytical results signal from the spectrometer. When the spectrometer detects that the concentration of hydrogen sulfide gas exceeds the standard, it sends an "exceeding standard" analytical result signal to the processor. The processor then sends a signal to the alarm, which can be an audible and visual alarm that emits sound and special light to alert personnel.

[0020] An air inlet pipe 5 is installed on the gas pool 3 near the injection end. A gas filter 6 and a gas flow regulator 7 are installed on the air inlet pipe 5. An air outlet pipe 8 is installed on the gas pool 3 near the injection end. An air pump 9 is installed on the air outlet pipe 8. The air pump 9 creates a negative pressure in the gas pool 3, allowing downhole air to enter through the air inlet pipe 5.

[0021] The acquisition system is externally equipped with a housing 10, which can be fixed to the drill rod and sinks with the drill rod. Inside the housing 10 is a battery 11 that is connected to the light source 1, the air pump 9, and the flow regulator. The battery 11 is used to power the acquisition system. The battery 11 can be connected to a ground power source via a power cord.

[0022] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects.

Claims

1. A downhole gas concentration dynamic monitoring and early warning device, characterized in that, It comprises a collecting system and an analyzing system; the collecting system is installed downhole, and the analyzing system is installed on the ground; the collecting system comprises a light source, a monochromator and a gas cell; the light source and the monochromator are located at the incident end of the gas cell; the emitting end of the gas cell is provided with a transmission optical fiber; the other end of the transmission optical fiber is connected with the analyzing system; the analyzing system comprises a spectrometer.

2. The device according to claim 1, characterized in that, An air inlet pipe is arranged on the gas cell close to the emitting end; the air inlet pipe is provided with a gas filter and a gas flow regulator; an air outlet pipe is arranged on the gas cell close to the incident end; the air outlet pipe is provided with an air pump.

3. The device according to claim 2, characterized in that, The gas cell is long-shaped; one length end of the gas cell is the incident end, and the other length end is the emitting end.

4. The device according to claim 3, characterized in that, The collecting system is externally provided with a shell; the shell is internally provided with a battery connected with the light source, the air pump and the flow regulator.

5. The device according to claim 1, characterized in that, The analyzing system further comprises a processor; the processor is electrically connected with the spectrometer; the processor is signal-connected with an alarm.

6. The device according to claim 1, characterized in that, The light source is a deuterium lamp.

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