Carbon dioxide concentration monitoring and alarm device in oil well associated gas

Abstract

The application discloses oil well associated gas carbon dioxide concentration monitoring and alarm equipment and belongs to the technical field of oil exploitation. The equipment comprises a base, two separation cylinders arranged on the base, a suction pipe and a gas outlet pipe arranged between the two separation cylinders, a monitor fixedly arranged on the base and connected with the gas outlet pipe, an alarm fixedly arranged on the base and electrically connected with the monitor, and a suction mechanism arranged on the base and connected with the separation cylinders. The suction pipe is connected with an oil well or an oil suction pipe. During monitoring, the suction mechanism sucks the oil-gas mixture into the separation cylinders through the suction pipe for separation, the mixed gas enters the monitor from the gas outlet pipe after separation, the carbon dioxide concentration is monitored, and the alarm is triggered when the carbon dioxide concentration exceeds the standard, so that the high carbon dioxide concentration of the extracted product is avoided to cause the poisoning of the operators.

Description

Technical Field

[0001] This application relates to the field of oil extraction technology, and more specifically, to equipment for monitoring and alarming carbon dioxide concentration in associated gas from oil wells. Background Technology

[0002] In the process of enhancing oil recovery through carbon dioxide flooding in oilfields, some of the carbon dioxide injected into the formation is extracted from the oil well along with the crude oil, forming associated carbon dioxide gas. The concentration of carbon dioxide in this associated gas is often significantly higher than in conventional extraction and fluctuates considerably. High concentrations of carbon dioxide not only accelerate the corrosion of gathering and transportation pipelines and equipment, affecting the efficiency of downstream processing technologies, but abnormally high concentrations (such as gas channeling) can also easily lead to safety hazards. Currently, on-site monitoring relies on intermittent manual detection, which is inefficient and makes it difficult to promptly detect and warn of concentration exceeding limits. Therefore, there is an urgent need for a specialized device that can monitor the concentration of associated carbon dioxide in real time, online, and automatically, and immediately issue an alarm when the concentration exceeds the limit, to ensure production safety and process stability.

[0003] Existing technology publication CN216741430U provides a wellhead device for carbon dioxide flooding oil production, including: a wellhead four-way valve, an annular measurement assembly, a vent valve, a main oil supply pipe, a sub-oil supply pipe, a measuring pipe, a blowout preventer (BOP), and a sealing assembly; the wellhead four-way valve is connected to the wellhead casing, annular measurement assembly, vent valve, and connecting pipe assembly; the connecting pipe assembly is connected to the BOP; the BOP is also connected to the sealing assembly; the main oil supply pipe is connected to the connecting pipe assembly, and the main oil supply pipe is equipped with a shut-off valve, a main gate valve, and a check valve; a first pressure gauge is connected to the shut-off valve; one end of the main oil supply pipe is connected to the measuring pipe, and one end of the sub-oil supply pipe; the vent valve is connected to the measuring pipe.

[0004] Although the existing technical solutions described above can achieve the relevant beneficial effects through their structure, they still have the following drawbacks: As oil extraction progresses, carbon dioxide levels gradually increase and are extracted along with associated gas from the oil wells. The lack of monitoring devices for carbon dioxide concentration means that excessively high concentrations of extracted carbon dioxide can poison the well operators.

[0005] Regarding the aforementioned technologies, the inventor believes that as oil extraction progresses, the carbon dioxide content gradually increases and is extracted along with associated gas from the oil well. The lack of a device to monitor carbon dioxide concentration means that if the extracted carbon dioxide concentration is too high, it could poison the oil well operators.

[0006] In view of this, we propose a device for monitoring and alarming the carbon dioxide concentration in associated gas from oil wells. Utility Model Content

[0007] 1. Technical problems to be solved The purpose of this application is to provide a device for monitoring and alarming the concentration of carbon dioxide in associated gas from oil wells. This solves the technical problem in the background art where, as oil extraction progresses, the carbon dioxide content gradually increases and is extracted along with the associated gas from the oil well. There is a lack of devices for monitoring the concentration of carbon dioxide, and if the extracted carbon dioxide concentration is too high, it will poison the oil well operators. This application achieves the desired technical effect.

[0008] 2. Technical Solution This application provides a device for monitoring and alarming the carbon dioxide concentration in associated gas from oil wells, including: Base; Separation cylinders, two separation cylinders are provided on the base; An extraction pipe and an outlet pipe are installed between the two separation cylinders; The monitor is fixedly installed on the base and connected to the air outlet pipe; An alarm is fixedly installed on the base and electrically connected to a monitoring device. A suction mechanism is mounted on the base and connected to a separation cylinder.

[0009] With the above scheme, the extraction pipe is connected to the oil well or the oil pumping pipe. During monitoring, the suction mechanism draws the oil and gas mixture into the separation cylinder through the extraction pipe for separation. After separation, the mixed gas enters the monitoring instrument from the gas outlet pipe to monitor the carbon dioxide concentration. When the concentration exceeds the standard, the alarm will sound, thereby avoiding the production of carbon dioxide that could lead to poisoning of the operators.

[0010] Optionally, the separator includes a partition plate, which is fixedly installed inside the separator. The inner cavities of the separator on both sides of the partition plate form a separator chamber and an exhaust chamber, respectively. The extraction pipe and the exhaust pipe are connected to the top of the separator chamber and the exhaust chamber, respectively. The partition plate has a through hole, and an L-shaped baffle is fixedly installed on the partition plate on the side of the through hole near the separator chamber. An oil drain pipe is fixedly sleeved at the bottom of the separator chamber. Valves are installed on both the extraction pipe and the oil drain pipe, and one-way valves are installed on the ends of the extraction pipe and the exhaust pipe near the separator.

[0011] With the above method, the oil-gas mixture enters the separation chamber from the extraction pipe, and after sedimentation and separation, the gas enters the gas outlet chamber through the through hole and finally flows out from the gas outlet pipe for monitoring.

[0012] Optionally, the suction mechanism includes a fixed cylinder, and two fixed cylinders are fixedly installed on the base. One end of the fixed cylinder is connected to the bottom of the air outlet chamber through a connecting pipe. A piston is slidably engaged inside the fixed cylinder, and a push-pull rod is fixedly installed on the piston. The two push-pull rods pass through the fixed cylinder and are fixedly connected to both ends of the sliding frame. Racks are fixedly installed on both inner walls of the sliding frame. A motor is fixedly installed on the base. The output shaft of the motor extends into the inner cavity of the sliding frame and is fixedly sleeved with a half gear. The half gear meshes with the rack. The cross-section of the push-pull rod is rectangular, and the push-pull rod and the fixed cylinder are clearance-fitted. The bottom of the air outlet chamber and the inner cavity of the fixed cylinder near the connecting pipe are filled with sealing oil.

[0013] With the above scheme, the motor drives the half gear to rotate continuously, and the half gear alternately meshes with the two racks, thereby causing the sliding frame to move back and forth. The push-pull rod drives the piston to move back and forth, and the two fixed cylinders alternately draw sealing oil from the exhaust chamber and blow sealing oil into the exhaust chamber. When the sealing oil is drawn, the oil-gas mixture is drawn into the separation chamber, and the separated gas enters the exhaust chamber. When the sealing oil is blown in, the gas in the exhaust chamber is blown out from the exhaust pipe, thereby enabling the monitor to continuously monitor the carbon dioxide concentration.

[0014] 3. Beneficial effects One or more technical solutions provided in this application have at least the following technical effects or advantages: This application utilizes a motor to drive a half-gear to rotate continuously. The half-gear alternately meshes with two racks, causing the sliding frame to move back and forth. This, in turn, causes the push-pull rod to drive the piston to move back and forth. As a result, one of the two fixed cylinders draws in sealing oil from the exhaust chamber, while the other blows in sealing oil into the exhaust chamber. These processes occur alternately. When the sealing oil is drawn in, the oil-gas mixture is drawn into the separation chamber, and the separated gas enters the exhaust chamber. When the sealing oil is blown in, the gas in the exhaust chamber is blown out from the exhaust pipe. This allows the monitor to continuously monitor the carbon dioxide concentration, preventing excessively high carbon dioxide concentrations from causing poisoning to personnel. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a carbon dioxide concentration monitoring and alarm device in associated gas of an oil well, as disclosed in a preferred embodiment of this application.

[0016] Figure 2 This application discloses a preferred embodiment. Figure 1 Enlarged structural diagram at point A in the middle.

[0017] Figure 3 This application discloses a preferred embodiment. Figure 1 Enlarged structural diagram at point B.

[0018] The following are the labels in the diagram: 1. Base; 2. Separator cylinder; 21. Baffle plate; 22. Separation chamber; 23. Air outlet chamber; 24. Through hole; 3. Extraction pipe; 4. Air outlet pipe; 5. Monitor; 6. Alarm; 7. Suction mechanism; 71. Fixed cylinder; 72. Connecting pipe; 73. Piston; 74. Push-pull rod; 75. Sliding frame; 76. Rack; 77. Motor; 78. Half gear. Detailed Implementation

[0019] The present application will be further described in detail below with reference to the accompanying drawings. Reference Figure 1 This application provides a device for monitoring and alarming the concentration of carbon dioxide in associated gas from oil wells, comprising: a base 1; two separation cylinders 2 on the base 1; an extraction pipe 3 and an outlet pipe 4, with the extraction pipe 3 and outlet pipe 4 installed between the two separation cylinders 2; a monitor 5, fixedly installed on the base 1 and connected to the outlet pipe 4; an alarm 6, fixedly installed on the base 1 and electrically connected to the monitor 5; and a suction mechanism 7, installed on the base 1 and connected to the separation cylinders 2. The extraction pipe 3 is connected to the oil well or a sucker pipe. During monitoring, the suction mechanism 7 draws the oil-gas mixture into the separation cylinders 2 through the extraction pipe 3 for separation. After separation, the mixed gas enters the monitor 5 through the outlet pipe 4 to monitor the carbon dioxide concentration. When the concentration exceeds the standard, the alarm 6 sounds an alarm, thereby preventing the extracted carbon dioxide concentration from being too high and causing poisoning of operators.

[0020] Reference Figure 1 and Figure 2 The separator 2 includes a partition 21, which is fixedly installed inside the separator 2. The inner cavities of the separator 2 on both sides of the partition 21 form a separator 22 and an exhaust chamber 23, respectively. The extraction pipe 3 and the exhaust pipe 4 are connected to the top of the separator 22 and the exhaust chamber 23, respectively. The partition 21 has a through hole 24. An L-shaped baffle is fixedly installed on the partition 21 on the side of the through hole 24 near the separator 22. The bottom of the separator 22 is fixedly fitted with an oil drain pipe. Valves are installed on both the extraction pipe 3 and the oil drain pipe. One-way valves are installed on the ends of the extraction pipe 3 and the exhaust pipe 4 near the separator 2. The oil-gas mixture enters the separator 22 from the extraction pipe 3. After sedimentation and separation, the gas enters the exhaust chamber 23 from the through hole 24 and finally flows out from the exhaust pipe 4 for monitoring.

[0021] Reference Figures 1 to 3The suction mechanism 7 includes a fixed cylinder 71. Two fixed cylinders 71 are fixedly installed on the base 1. One end of the fixed cylinder 71 is connected to the bottom of the air outlet chamber 23 through a connecting pipe 72. A piston 73 is slidably engaged inside the fixed cylinder 71. A push-pull rod 74 is fixedly installed on the piston 73. The two push-pull rods 74 pass through the fixed cylinder 71 and are fixedly connected to both ends of the sliding frame 75. A rack 76 is fixedly installed on both inner walls of the sliding frame 75. A motor 77 is fixedly installed on the base 1. The output shaft of the motor 77 extends into the inner cavity of the sliding frame 75 and is fixedly sleeved with a half gear 78. The half gear 78 meshes with the rack 76. The push-pull rod 74 has a rectangular cross-section and a gap between the push-pull rod 74 and the fixed cylinder 71. In conjunction with this, the bottom of the exhaust chamber 23 and the inner cavity of the fixed cylinder 71 near the connecting pipe 72 are filled with sealing oil. The motor 77 drives the half gear 78 to rotate continuously. The half gear 78 alternately meshes with the two racks 76, thereby causing the sliding frame 75 to move back and forth. The push-pull rod 74 drives the piston 73 to move back and forth. Thus, one of the two fixed cylinders 71 draws the sealing oil from the exhaust chamber 23 and the other blows the sealing oil into the exhaust chamber 23, and they do so alternately. When the sealing oil is drawn in, the oil-gas mixture is drawn into the separation chamber 22, and the separated gas enters the exhaust chamber 23. When the sealing oil is blown in, the gas in the exhaust chamber 23 is blown out from the exhaust pipe 4, thereby enabling the monitor 5 to continuously monitor the carbon dioxide concentration.

[0022] Working principle: The extraction pipe 3 is connected to the oil well or the sucker pipe. During monitoring, the motor 77 drives the half gear 78 to rotate continuously. The half gear 78 alternately meshes with the two racks 76, which causes the sliding frame 75 to move back and forth. The push-pull rod 74 drives the piston 73 to move back and forth. The two fixed cylinders 71 alternately draw the sealing oil from the gas outlet chamber 23 and blow the sealing oil into the gas outlet chamber 23. When the sealing oil is drawn, the oil-gas mixture is drawn into the separation chamber 22, and the separated gas enters the gas outlet chamber 23. When the sealing oil is blown in, the gas in the gas outlet chamber 23 is blown out from the gas outlet pipe 4, so that the monitor 5 continuously monitors the carbon dioxide concentration.

Claims

1. A device for monitoring and alarming carbon dioxide concentration in associated gas from oil wells, characterized in that: Include: Base (1); Separation cylinder (2), two separation cylinders (2) are provided on the base (1); Extraction pipe (3) and air outlet pipe (4) are installed between the two separation cylinders (2); The monitor (5) is fixedly installed on the base (1) and the monitor (5) is connected to the air outlet pipe (4); An alarm (6) is fixedly installed on the base (1), and the alarm (6) is electrically connected to the monitoring instrument (5). A suction mechanism (7) is installed on the base (1), and the suction mechanism (7) is connected to the separation cylinder (2).

2. The carbon dioxide concentration monitoring and alarm device in associated gas of oil wells according to claim 1, characterized in that: The separation cylinder (2) includes a partition (21). The partition (21) is fixedly installed inside the separation cylinder (2). The inner cavities of the separation cylinder (2) on both sides of the partition (21) form a separation cavity (22) and an air outlet cavity (23), respectively. The extraction pipe (3) and the air outlet pipe (4) are respectively connected to the top of the separation cavity (22) and the air outlet cavity (23). The partition (21) has a through hole (24).

3. The carbon dioxide concentration monitoring and alarm device in associated gas of oil wells according to claim 2, characterized in that: An L-shaped baffle is fixedly installed on the partition plate (21) on the side of the through hole (24) near the separation chamber (22). An oil drain pipe is fixedly sleeved at the bottom of the separation chamber (22). Valves are installed on both the extraction pipe (3) and the oil drain pipe. One-way valves are installed on the end of the extraction pipe (3) and the air outlet pipe (4) near the separation cylinder (2).

4. The carbon dioxide concentration monitoring and alarm device in associated gas of oil wells according to claim 2, characterized in that: The suction mechanism (7) includes a fixed cylinder (71). Two fixed cylinders (71) are fixedly installed on the base (1). One end of the fixed cylinder (71) is connected to the bottom of the air outlet chamber (23) through a connecting pipe (72). A piston (73) is slidably engaged inside the fixed cylinder (71). A push-pull rod (74) is fixedly installed on the piston (73). The two push-pull rods (74) pass through the fixed cylinder (71) and are fixedly connected to both ends of the sliding frame (75). A rack (76) is fixedly installed on both sides of the inner wall of the sliding frame (75). A motor (77) is fixedly installed on the base (1). The output shaft of the motor (77) extends into the inner cavity of the sliding frame (75) and is fixedly sleeved with a half gear (78). The half gear (78) meshes with the rack (76).

5. The carbon dioxide concentration monitoring and alarm device in associated gas of oil wells according to claim 4, characterized in that: The push-pull rod (74) has a rectangular cross-section and a clearance fit between the push-pull rod (74) and the fixed cylinder (71). The bottom of the air outlet (23) and the inner cavity of the fixed cylinder (71) near the connecting pipe (72) are filled with sealing oil.

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