Real-time detection device and method for oxygen content of high-temperature and high-pressure gas

Abstract

The invention belongs to the technical field of oil field oil extraction and gas extraction, and discloses a real-time detection device and method for the oxygen content of high-temperature and high-pressure gas. The device comprises a pressure regulating system, a separation system, a heating system, a detection system and a main control system, wherein a high-temperature and high-pressure gas inlet, the pressure regulating system and the separation system are sequentially arranged in the device, low-flow low-pressure gas is emptied at a high point, the heating system is arranged above the separation system, and the detection system and the main control system are connected to the heating system. Real-time detection, real-time display and closed-loop automatic adjustment control of the oxygen content of the high-temperature and high-pressure mixed-phase gas are realized through a series of processes.

Description

Technical Field

[0001] The invention belongs to the technical field of oil field oil and gas production, and specifically relates to a device and method for real-time detection of oxygen content in high-temperature and high-pressure gas. Background Art

[0002] High-temperature and high-pressure mixed-phase gas flooding, production increase, and plugging removal technology is a mature special technology for tertiary oil recovery. The core technology of high-temperature and high-pressure mixed-phase gas flooding is to configure high-pressure air, fuel oil and water, and produce a composite heat carrier (50% water vapor, 40% nitrogen, 10% carbon dioxide) through high-pressure explosion and heat exchange in the gas generator, which produces expansion effect, heat conduction effect, high pressure effect, and viscosity reduction effect to achieve the purpose of oil recovery, production increase, and plugging removal. Among them, the oxygen content index in the heat carrier is related to the overall effect of the technology and the safety of on-site construction. This technology has been formed for decades, but it has not formed a mature and stable effective means to detect the oxygen content of high-temperature and high-pressure mixed-phase gas. A real-time detection process method for oxygen content in high-temperature and high-pressure gas successfully realizes real-time monitoring, display and closed-loop automatic control of the oxygen content of high-temperature and high-pressure mixed-phase gas. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a real-time detection device and method for oxygen content in high-temperature and high-pressure gas. The method reduces detection costs, performs real-time dynamic monitoring, and realizes closed-loop automatic control, thereby solving the problems of the prior art in lack of effective detection means, on-site construction safety, and dynamic control.

[0004] The above-mentioned object of the present invention is achieved through the following technical scheme: a real-time detection device for the oxygen content of high-temperature and high-pressure gas, including a pressure regulating system, a separation system, a heating system, a detection system and a main control system; wherein the device is provided with a high-temperature and high-pressure gas inlet, a pressure regulating system, a separation system, and a low-flow and low-pressure gas high-point exhaust in sequence, the heating system is arranged above the separation system, and the detection system and the main control system are connected to the heating system.

[0005] Furthermore, the separation system includes a gas inlet, a gas outlet, an inverted funnel spiral gas separator, a bottom water discharge port, and a bottom water discharge valve. The gas inlet is connected to the outlet of the pressure regulating system. The main body of the separation system is an inverted funnel with an inverted funnel spiral gas separator inside. A bottom water discharge port is provided below the inverted funnel, and a bottom water discharge valve is provided on the bottom water discharge port.

[0006] Furthermore, the heating system includes a junction box, a detection sensor body, a heating system gas inlet, and a heating rod. The junction box is arranged above the detection sensor body, the heating rod outer casing is provided with a heating system gas inlet, and the heating rod is inserted into the separation system.

[0007] Furthermore, the detection system is provided with an information collection unit in the pressure regulating system, the separation system and the heating system, and the information collection unit is connected to the main control system.

[0008] In a further preferred embodiment of the present invention, the entire surface of the high-temperature and high-pressure gas oxygen content real-time detection device is provided with explosion-proof protection.

[0009] In a further preferred embodiment of the present invention, a heating system and an oxygen content sensing unit are installed inside the separation system, and the oxygen content sensing unit is respectively connected to the main control system signal.

[0010] A further preferred embodiment of the present invention is that the voltage regulating system, heating system, separation system, detection system and main control system are signal connected and closed-loop regulated and controlled.

[0011] Another object of the present invention is to protect the detection method of the above-mentioned high-temperature and high-pressure gas oxygen content real-time detection device, the steps are: the high-temperature and high-pressure gas enters from the high-temperature and high-pressure gas inlet, and after the pressure is adjusted by the pressure regulating system, it enters the separation system connected to the heating system for heating and separation, the separated liquid phase and residue are discharged through the bottom water discharge port, and the low-pressure gas is discharged through the flow low-pressure gas high point emptying, and the above whole process is detected in real time by the detection system and the parameters are controlled by the main control system.

[0012] Compared with the prior art, the beneficial effects of the present invention are: a process method for real-time detection of oxygen content in high-temperature and high-pressure gas, which realizes real-time detection, real-time display and closed-loop automatic adjustment and control of oxygen content in high-temperature and high-pressure mixed-phase gas through a series of processes. It solves the technical gap of no effective means for real-time detection and closed-loop automatic control of oxygen content in high-temperature and high-pressure mixed-phase gas for decades. The dynamic real-time monitoring of oxygen content effectively improves the safety and controllability of the construction process on site; the closed-loop automatic adjustment and control effectively improves the fuel efficiency of the process and greatly reduces the process cost; the PLC automatic control system effectively reduces the manual operation link, ensures personnel safety and reduces labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0014] Figure 1 This is a schematic diagram of the overall structure of the real-time detection device for oxygen content in high-temperature and high-pressure gas according to the present invention;

[0015] Figure 2 This is a schematic diagram of the separation system structure of the real-time detection device for oxygen content in high-temperature and high-pressure gas according to the present invention;

[0016] Figure 3 It is a schematic diagram of the heating system structure of the real-time detection device for oxygen content in high-temperature and high-pressure gas of the present invention.

[0017] In the figure, 1. Main control system; 2. Detection system; 3. Pressure regulating system; 4. Separation system; 5. Heating system; 6. High-temperature and high-pressure gas inlet; 7. Low-flow and low-pressure gas high-point exhaust; 41. Gas inlet; 42. Gas outlet; 43. Inverted funnel spiral gas distributor; 44. Bottom water discharge port; 45. Bottom water discharge valve; 51. Junction box; 52. Detection sensor body; 53. Heating rod; 54. Heating system gas inlet. DETAILED DESCRIPTION

[0018] The present invention is described in detail below by specific examples, but the protection scope of the present invention is not limited. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can be obtained from commercial channels.

[0019] A real-time detection device for oxygen content in high-temperature and high-pressure gas in the following embodiment is characterized in that it includes a pressure regulating system 3, a separation system 4, a heating system 5, a detection system 2 and a main control system 1; wherein the device is provided with a high-temperature and high-pressure gas inlet 6, a pressure regulating system 3, a separation system 4, and a low-flow and low-pressure gas high-point exhaust 7 in sequence, the heating system 5 is arranged above the separation system 4, the detection system 2 and the main control system 1 are connected to the heating system 5, the separation system 4 includes a gas inlet 41, a gas outlet 42, an inverted funnel spiral gas separator 43, a bottom water discharge port 44, and a bottom water discharge valve 45, the gas inlet 41 is connected to the outlet of the pressure regulating system 3, the main body of the separation system 4 is an inverted funnel, which is provided with an inverted funnel spiral gas separator 43, a bottom water discharge port 44 is provided below the inverted funnel, and a bottom water discharge valve 45 is provided on the bottom water discharge port 44, The heating system 5 includes a junction box 51, a detection sensor body 52, a separation system gas inlet 54, and a heating rod 53. The junction box 51 is arranged above the detection sensor body 52. ​​The separation system gas inlet 54 is arranged on the outer casing of the heating rod 53. The heating rod 53 is inserted into the separation system 4. The detection system 2 is provided with an information acquisition unit in the pressure regulating system 3, the separation system 4, and the heating system 5, and the above-mentioned information acquisition unit is connected to the main control system 1. The overall surface of the real-time detection device for oxygen content in high-temperature and high-pressure gas is provided with explosion-proof protection. The interior of the separation system is provided with a heating system 5 and an oxygen content sensing unit, and the oxygen content sensing unit is respectively connected to the main control system 1 by signal. The pressure regulating system 3, the heating system 5, the separation system 4, the detection system 2 and the main control system 1 are signal-connected and closed-loop regulated and controlled.

[0020] Example 1

[0021] A method for implementing a process for real-time detection of oxygen content in high-temperature and high-pressure gas.

[0022] A high-temperature and high-pressure gas oxygen content real-time detection process device is set up, and a main control system, a detection system, a pressure reduction system, a steam-water separation system and a pipeline oxygen content sensor are respectively set up inside the high-temperature and high-pressure gas oxygen content real-time detection process device to sense the oxygen content of the gas, and the data is transmitted to the main control system. The main control system is used to control the front-end gas supply process, so as to realize real-time detection and closed-loop automatic control and adjustment of the oxygen content of the high-temperature and high-pressure mixed-phase gas, reduce the links of manual operation, and achieve the effect of reducing the operating cost of on-site equipment.

[0023] Specifically, a high-temperature and high-pressure gas oxygen content real-time detection process method device is provided with a support frame, and a high-temperature and high-pressure gas oxygen content real-time detection process method device is provided with explosion-proof protection.

[0024] Through the above technical solution, the entire process module is modularized and explosion-proof, easy to install, and equipped with a mounting bracket on the back.

[0025] Specifically, a heating and sensor unit is installed inside the pipeline oxygen content sensor, and the heating and detection sensor unit are respectively connected to the main control system and the detection system signal.

[0026] Through the above technical solution, the pressure of the regulating pipeline in the depressurization system is within the normal operating pressure range of the oxygen content sensor with heating and heat exchanger. The oxygen content sensor with heating and heat exchanger heats the low-pressure gas after pressure regulation and then detects the oxygen content of the gas flowing through it. The obtained data is sent to the detection system for modulation and demodulation, and then returned to the main control system through the 485 signal line for analysis and displayed on the secondary display system. At the same time, the air-fuel ratio of the front-end high-pressure gas equipment is adjusted through the main control system, and then the above detection process is continued to cycle. The main control system adjusts the oxygen content to a safe operating range after several adjustments and shocks based on the data obtained by the detection system.

[0027] The entire process method detects analog data through an oxygen content sensor with heating and heat exchanger, and then modulates and demodulates the data to the detection module 2, and then passes through multiple closed-loop comparison controls by the main control module. After several oscillation cycles, the required oxygen content value on site is reached. After reaching a stable value, the main control module fixes the fuel ratio of the front-end equipment to keep the oxygen content value within the required controllable range.

[0028] The above-described embodiments are only preferred embodiments of the present invention, but not all feasible embodiments of the present invention. For those skilled in the art, any obvious changes made thereto without departing from the principles and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention.

Claims

1. A real-time detection device for oxygen content in high-temperature and high-pressure gas, characterized in that: The device comprises a pressure regulating system (3), a separation system (4), a heating system (5), a detection system (2) and a main control system (1); wherein the device is provided with a high-temperature and high-pressure gas inlet (6), a pressure regulating system (3), a separation system (4), and a low-flow and low-pressure gas high-point exhaust (7) in sequence; the heating system (5) is arranged above the separation system (4); and the detection system (2) and the main control system (1) are connected to the heating system (5).

2. The real-time detection device for oxygen content in high-temperature and high-pressure gas according to claim 1, characterized in that: The separation system (4) comprises a gas inlet (41), a gas outlet (42), an inverted funnel spiral gas separator (43), a bottom water discharge port (44), and a bottom water discharge valve (45); the gas inlet (41) is connected to the outlet of the pressure regulating system (3); the main body of the separation system (4) is an inverted funnel, in which the inverted funnel spiral gas separator (43) is arranged; a bottom water discharge port (44) is arranged below the inverted funnel, and a bottom water discharge valve (45) is arranged on the bottom water discharge port (44).

3. The real-time detection device for oxygen content in high-temperature and high-pressure gas according to claim 1, characterized in that: The heating system (5) comprises a junction box (51), a detection sensor body (52), a heating system gas inlet (54), and a heating rod (53); the junction box (51) is arranged above the detection sensor body (52); a heating system gas inlet (54) is arranged on a tube arranged outside the heating rod (53); and the heating rod (53) is inserted into the separation system (4).

4. The real-time detection device for oxygen content in high-temperature and high-pressure gas according to claim 1, characterized in that: The detection system (2) is provided with an information collection unit in the pressure regulating system (3), the separation system (4) and the heating system (5), and the information collection unit is connected to the main control system (1).

5. The real-time detection device for oxygen content in high-temperature and high-pressure gas according to claim 1, characterized in that: The entire surface of the high-temperature and high-pressure gas oxygen content real-time detection device is provided with explosion-proof protection.

6. The real-time detection device for oxygen content in high-temperature and high-pressure gas according to claim 1, characterized in that: The separation system is internally provided with a heating system (5) and an oxygen content sensing unit, and the oxygen content sensing unit is respectively connected to the main control system (1) by signal.

7. The real-time detection device for oxygen content in high-temperature and high-pressure gas according to claim 1, characterized in that: Signal connection and closed-loop regulation control are provided between the pressure regulating system (3), the heating system (5), the separation system (4), the detection system (2) and the main control system (1).

8. The detection method based on the real-time detection device for oxygen content in high-temperature and high-pressure gas according to claim 1 is characterized in that: The steps are as follows: high-temperature and high-pressure gas enters from a high-temperature and high-pressure gas inlet (6), and after the pressure is adjusted by a pressure regulating system (3), enters a separation system (4) connected to a heating system (5) for heating and separation; the separated liquid phase and residue are discharged through a bottom water discharge port (44); and low-pressure gas is discharged through a flow low-pressure gas high-point exhaust (7); the entire process is detected in real time by a detection system (2) and parameter control is performed by a main control system (1).

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