CN105092779B - On-line detection device and process method of air foam flooding produced gas - Google Patents

Abstract

An air foam flooding produced gas online detection device and a process method belong to the technical field of oil extraction. The explosion-proof power supply 1 is connected with the flow controller 4, the electromagnetic control valve 5, the O2, the CO2, the combustible gas detection transmitter 10, the GPRS network device 12 and all pipeline heat-preservation heating devices to provide power; well head casing gas is led into the flow controller 4 through an air guide pipe, the other end of the flow controller 4 is connected with an electromagnetic control valve 5 through a pipeline, the other end of the electromagnetic control valve 5 is connected with a buffer tank 6 through a pipeline, the bottom of the buffer tank 6 is connected with an electromagnetic valve 8, the upper part of the buffer tank 6 is connected with a gas filter 9 through a pipe, the other end of the gas filter 9 is connected with O2, CO2 and a combustible gas detection transmitter 10 through a pipeline, the O2, CO2 and the combustible gas detection transmitter 10 are connected with a data collector 11, and the data collector 11 collects and transmits test data to a GPRS network device 12 and transmits the test data to a computer software device 7.

Description

On-line detection device and process method of air foam flooding produced gas

technical field

The invention relates to an on-line detection device and a process method for air foam flooding produced gas, belonging to the technical field of oil recovery.

Background technique

The air foam flooding technology is to use a blower to inject a certain amount of air into the oil layer through the injection well. Due to the existence of natural fractures, bedding and vertical fractures formed by fracturing in the formation, gas channeling is prone to occur; or, due to the long-term injection of water along the large The channel flow further scours the formation, increases the heterogeneity, and is prone to gas channeling; these unfavorable factors will cause the injected gas to be produced from the oil well prematurely; because the air contains a certain amount of oxygen, it is easy to produce oxygen from the oil well. Severe corrosion occurs to oil production equipment, especially when the oxygen concentration reaches a certain amount, it is prone to explosion. Therefore, during the operation period, the daily gas production and component content of the corresponding production wells should be regularly monitored. Once oxygen components are found, the density of production gas component monitoring should be strengthened. When the oxygen in the production well is close to the critical value, decisive measures such as shutting down the well should be taken.

When oxygen is detected from the oil well casing gas, the following detection system is implemented. Currently, a portable monitor is used to monitor the oxygen concentration in the oil well casing on a regular or irregular basis; The detection cycle is detected.

For example:

1. When the oxygen concentration is between 1% and 3%, monitor the oxygen concentration every 2 hours on site.

2. When the oxygen concentration is between 3% and 5%, monitor the oxygen concentration every hour on site.

3. When the oxygen concentration reaches 5%, the injection well Liu 74-60 is stopped, and the 4 oil wells are shut down.

Due to the large number of oil wells in the test area and the mountainous area, the labor load is too large, so the test work cannot be carried out normally; in addition, due to the frequent change of test personnel, different people have different levels of proficiency in the instruments, resulting in differences in test results. It is easy to cause safety hazards. Therefore, there is an urgent need for technical transformation to meet actual needs.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention provides an on-line detection device and process method for air-foam flooding produced gas.

An on-line detection device for air foam flooding produced gas, explosion-proof power supply 1 connected to flow controller 4, electromagnetic control valve 5, O ₂ , CO, CO ₂ and combustible gas detection transmitter 10, GPRS network device 12 and all pipes The heat preservation and heating device of the road provides power supply; the wellhead casing gas is introduced into the flow controller 4 through the bleed pipe, the other end of the flow controller 4 is connected to the electromagnetic control valve 5 through the pipeline, and the other end of the electromagnetic control valve 5 is connected to the buffer tank 6 through the pipeline , the bottom of buffer tank 6 is connected to solenoid valve 8, the upper pipe of buffer tank 6 is connected to gas filter 9, and the other end of gas filter 9 is connected to _O2 , CO, _CO2 and combustible gas detection transmitter 10 through pipelines, _O2 , CO, CO ₂ and combustible gas detection transmitters 10 are connected to a data collector 11, and the data collector 11 collects and transmits test data to the GPRS network device 12 and transmits it to the computer software device 7 in the monitoring room.

A process method for on-line detection of gas produced by air foam flooding, comprising the following steps;

The explosion-proof power supply 1 provides power to the flow controller 4, electromagnetic control valve 5, O ₂ , CO, CO ₂ and combustible gas detection transmitter 10, GPRS network device 12, and all pipeline insulation and heating devices; when the wellhead casing gas Introduce the flow controller 4 through the air induction pipe, the flow controller 4 controls the reasonable flow and gas pressure through the internal flow sensor and pressure sensor, when the flow and pressure meet the set value, the gas is introduced into the buffer tank through the pipeline and the electromagnetic control valve 5 6. A gas-liquid separator is designed in the buffer tank 6. When there is liquid accumulation in the buffer tank 6 and reaches a certain amount, the solenoid valve 8 at the bottom of the buffer tank 6 will automatically open to discharge the liquid, and the gas at the top of the buffer tank 6 will pass through the buffer tank. The upper pipe of tank 6 introduces gas filter 9 to further filter the gas, and the filtered gas is introduced into _O2 , CO, _CO2 and combustible gas detection transmitter 10 for detection, wherein the combustible gas detector detects combustible gas in the ambient atmosphere of the construction site The gas is detected in real time, the monitoring signal is collected by the data collector 11 and the test data is transmitted to the GPRS network device 12 and transmitted to the computer software device 7 in the monitoring room, and then the received data is processed, analyzed and reported by the computer software device 7 Processing, if the detection data exceeds the alarm value, the computer software device 7 will send out an alarm signal, and at the same time send a maintenance instruction to the on-site personnel for cooperative processing through the detection equipment failure alarm.

According to another aspect of the present invention, there is provided an online monitoring device for air foam flooding produced gas, including explosion-proof power supply, flow controller, electromagnetic control valve, O ₂ , CO, CO ₂ and combustible gas detection transmitters , GPRS network device, pipeline insulation heating device and buffer tank, explosion-proof power supply and flow controller, electromagnetic control valve, O ₂ , CO, CO ₂ and combustible gas detection transmitter, GPRS network device and pipeline insulation heating device Connection; the first end of the flow controller is connected to the inlet, the first end of the electromagnetic control valve is connected to the second end of the flow controller, the second end of the electromagnetic control valve is connected to the buffer tank, and the bottom of the buffer tank is connected to a solenoid valve , the buffer tank is connected with O ₂ , CO, CO ₂ and combustible gas detection transmitters, and the O ₂ , CO, CO ₂ and combustible gas detection transmitters are connected with GPRS network devices.

Furthermore, the on-line monitoring device for air-foam flooding produced gas also includes a filter, which is connected between the buffer tank and the O ₂ , CO, CO ₂ and combustible gas detection transmitters through pipelines.

Further, the communication position between the filter and the buffer tank is located on the top of the buffer tank.

Further, the air foam flooding oil production gas online monitoring device also includes a data collector, O ₂ , CO, CO ₂ and combustible gas detection transmitters are connected to the data collector, and the data collector collects the test data and transmits it to the GPRS network device and transmit to the computer software device in the monitoring room.

The advantages of the present invention are:

1. Realize online real-time detection of the oxygen concentration in the gas produced by the production well, grasp the oxygen content in time, and achieve the purpose of controlling the oxygen concentration in the gas produced by the production well within a safe range and ensuring safe production.

2. Real-time detection of the content and content changes of CO, CO ₂ , N ₂ , and combustible gases in the ambient air produced by the reaction between the injected air and formation crude oil or natural gas, for the scientific and accurate study of oxygen in air foam flooding The law of low-temperature oxidation reaction provides reliable data, which improves the research level and application effect.

3. Real-time detection of the content of combustible gas in the ambient air on site to avoid accidents such as explosions and ensure smooth production under safe conditions.

Invention effect:

The _{on -} site detection test proves that the output gas processing and control device can safely and smoothly control the flow rate, gas sampling and detection of the output gas. Timely and accurate detection and analysis, when the content of _O2 and CO in the produced gas and the combustible gas content in the on-site environment exceed the alarm value, the alarm can be timely detected and alarmed when the detection data is abnormal in the monitoring room, and can be promptly contacted with the detection site Personnel communication and processing, when the software fails, it can communicate with the software designer through the network to realize online real-time modification and processing; The oil law has obtained scientific test data.

Description of drawings

A more complete and better understanding of the invention, and many of its attendant advantages, will readily be learned by reference to the following detailed description when considered in conjunction with the accompanying drawings, but the accompanying drawings illustrated herein are intended to provide a further understanding of the invention and constitute A part of the present invention, the exemplary embodiment of the present invention and its description are used to explain the present invention, and do not constitute an improper limitation of the present invention, wherein:

Fig. 1 is a structural schematic diagram of the present invention.

detailed description

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

Embodiment 1: As shown in Figure 1, a kind of air foam flooding produced gas online detection device,

1. Gas detection device:

It is mainly composed of O ₂ , CO, CO ₂ and combustible gas detection transmitter 10 with data display function, solenoid valve 8, GPRS data acquisition and control module, industrial control computer, etc.

2. Gas collection and processing device:

A gas collection, control and processing device consisting of a flow controller 4, a solenoid valve 8, a gas-liquid separator (with pressure control function), and a filter. Provide the clean produced gas to the gas detector with the allowable flow rate and pressure to avoid damage to the detector and connecting pipelines, and ensure the safe and smooth operation of the detection device.

3. GPRS network and software data acquisition, processing, analysis and control device:

Collect and display the parameters of gas components produced by the wells to be detected, and store the data in the database, with functions such as real-time alarm, curve drawing, and data query; the gas measurement transmitter has dual functions of local display and data remote transmission control, which can Realize the purpose of viewing data on the spot and remote detection;

4. Safety monitoring limit alarm device:

Track the changes of monitoring data in real time. When the monitoring information of the device reaches the limit value of safety monitoring, the device will automatically trigger the alarm function, notify relevant personnel, and take measures to eliminate hidden dangers of accidents.

5. Safety monitoring information trend warning and limit prediction device:

By establishing a mathematical model, real-time analysis and monitoring information change trends, when the relevant indicators show an upward trend or a sharp change in the relevant indicators, a warning message will be issued in time.

6. Detection information statistical analysis report processing device:

Realize the query and display of detection historical data, and use the monitoring information to automatically generate monitoring information shift reports, daily reports, and monthly reports.

7. Gas sampling tube heating and heat preservation device:

When there is water mist in winter and the sampling pipeline is blocked, the remote heating program is started, and personnel manually discharge sewage on site. When the pipeline is not blocked, it is strictly forbidden to start the heating process.

Scope of application:

Suitable for O ₂ , CO, CO ₂ produced by oil and gas wells and combustible gases in the field environment, suitable for real-time monitoring of gas components in pipelines and equipment of oil and gas gathering and transportation devices.

Comparative analysis:

At present, a portable monitor is used to monitor the oxygen concentration in the casing of the oil well on a regular or irregular basis; once oxygen production is found, it will be detected at different detection cycles according to the oxygen concentration.

Due to the large number of oil wells in the test area and the mountainous area, the labor load is too large, so the test work cannot be carried out normally; in addition, due to the frequent change of test personnel, different people have different levels of proficiency in the instruments, resulting in differences in test results. It is easy to cause safety hazards. Therefore, there is an urgent need for technical transformation to meet actual needs.

The _{on -} site detection test proves that the output gas processing and control device can safely and smoothly control the flow rate, gas sampling and detection of the output gas. Timely and accurate detection and analysis, when the content of _O2 in the produced gas and the combustible gas content in the site environment exceed the alarm value, it can timely alarm, and when the detection data is found to be abnormal in the monitoring room, it can be detected and alarmed in time, and can communicate with the testing site personnel in time Processing, when the software fails, it can communicate with the software designer through the network to realize online real-time modification and processing; the data detected by the device is accurate and reliable, in order to cooperate with the analysis of the field test effect of air foam flooding and the law of oil flooding Obtained scientific test data.

An on-line detection device for air foam flooding produced gas, explosion-proof power supply 1 connected to flow controller 4, electromagnetic control valve 5, O ₂ , CO, CO ₂ and combustible gas detection transmitter 10, GPRS network device 12 and all pipes The wellhead casing gas at the wellhead 3 is introduced into the flow controller 4 through the air induction pipe 2, and the other end of the flow controller 4 is connected to the electromagnetic control valve 5 through the pipeline, and the other end of the electromagnetic control valve 5 is passed through the pipe. The pipeline is connected to the buffer tank 6, the bottom of the buffer tank 6 is connected to the solenoid valve 8, the upper pipe of the buffer tank 6 is connected to the gas filter 9, and the other end of the gas filter 9 is connected to _O2 , CO, _CO2 and combustible gas detection and transmission through pipelines 10, O ₂ , CO, CO ₂ and combustible gas detection transmitters 10 are connected to data collector 11, and data collector 11 collects and transmits test data to GPRS network device 12 and sends it to computer software device 7 in the monitoring room.

A process method for on-line detection of gas produced by air foam flooding, comprising the following steps;

The explosion-proof power supply 1 provides power to the flow controller 4, electromagnetic control valve 5, O ₂ , CO, CO ₂ and combustible gas detection transmitter 10, GPRS network device 12, and all pipeline insulation and heating devices; when the wellhead casing gas Introduce the flow controller 4 through the air induction pipe, the flow controller 4 controls the reasonable flow and gas pressure through the internal flow sensor and pressure sensor, when the flow and pressure meet the set value, the gas is introduced into the buffer tank through the pipeline and the electromagnetic control valve 5 6. A gas-liquid separator is designed in the buffer tank 6. When there is liquid accumulation in the buffer tank 6 and reaches a certain amount, the solenoid valve 8 at the bottom of the buffer tank 6 will automatically open to discharge the liquid, and the gas at the top of the buffer tank 6 will pass through the buffer tank. The upper pipe of tank 6 introduces gas filter 9 to further filter the gas, and the filtered gas is introduced into _O2 , CO, _CO2 and combustible gas detection transmitter 10 for detection, wherein the combustible gas detector detects combustible gas in the ambient atmosphere of the construction site The gas is detected in real time, the monitoring signal is collected by the data collector 11 and the test data is transmitted to the GPRS network device 12 and transmitted to the computer software device 7 in the monitoring room, and then the received data is processed, analyzed and reported by the computer software device 7 Processing, if the detection data exceeds the alarm value, the computer software device 7 will send out an alarm signal, and at the same time send a maintenance instruction to the on-site personnel for cooperative processing through the detection equipment failure alarm.

Embodiment 2: As shown in Figure 1, a kind of air foam flooding produced gas online detection device,

(1) The linear distance between the gas detection cabinet and the oil-gas separator is 20-30m;

(2) The straight-line distance between the gas detection cabinet and the vent point is 5m, and the vent end is raised by 3m (protected by a rainproof cap);

(3) Gas sampling pipelines and venting pipelines are made of galvanized pipes, and the connections with the cabinets are connected by threads (the materials and joints in the cabinets are stainless steel);

(4) The gas transmitter has dual modes of remote transmission and display;

(5) Sampling pipelines and venting pipelines are used for thermal insulation treatment, and DN15 galvanized pipes and DN25 galvanized pipes are used respectively;

(6) 220VAC adopts aviation plug connection mode, if it is not equipped with a heating belt, the power is 220V/10A; otherwise, 220V/50A power supply power is required;

(7) The acquisition control cabinet adopts skid-mounted method, which is convenient for installation and transportation.

2. Performance index of gas detection control cabinet:

(1) Measuring equipment and data detection and control equipment are arranged in upper and lower partitions, and are screwed into a combination;

(2) The gas measurement transmitter has dual functions of on-site display and data remote transmission, which can realize on-site viewing of data and long-distance detection;

(3) The equipment in the cabinet is made of stainless steel, which has good corrosion resistance;

(4) The inlet and outlet pipelines and sewage outlets are all connected by quick plug-in, which is convenient for quick assembly and disassembly;

(5) Size of gas detection cabinet: sheath block (height): 200mm, gas detection box: 600 (length) × 250 (width) × 500mm (height); data control transmission box: 600 (length) × 250 (width) × 250mm (height);

(6) The junction of the box body is connected with an explosion-proof hose;

(7) Designed with hoisting rings and cooling holes;

(8) The maximum dimensions of the data acquisition and control cabinet: height 1050mm, length 600mm, width 250mm.

3. Main equipment and accessories:

(1) Gas transmitter.

(2) G-4500 wireless transmission module, which realizes data acquisition, GPRS data acquisition and control module on one device, the communication mode is GPRS, and the working temperature is -25～+70℃. Seamless switching between Ethernet communication, GPRS communication, GPS positioning, and serial communication. CPU: 80186, 80MHz MiniOS7 operating device 512kB SRAM, 512kB Flash RS-232x2, RS-485x1 10/100Base-T＝X, RJ-45 3-way DI, 3-way DO, 8-way AI Support Modbus protocol, TCP/IP protocol Support Vxcomm technology to provide SD card slot, built-in GPRS/GSM communication module, built-in GPS module 128×64dotsLCM display.

(3) Industrial control computer. Realize the display of monitoring data, alarm, early warning, query and display of historical data.

(4) Combined switching power supply: 120WDC power supply, input voltage AC220V, output voltage DC24V 5A.

(5) Explosion-proof solenoid valve: domestic normally closed stainless steel explosion-proof solenoid valve, explosion-proof grade is dIIBT6, nominal diameter DN15, pressure 1.6MPa, medium temperature up to 60°C, threaded connection, power supply DC24V.

(6) Gas flow controller: stainless steel gas flow controller, nominal diameter DNI5, medium temperature up to 120°C, threaded connection, inlet pressure 1-2MPa, outlet pressure 0-0.1MPa adjustable.

(7) Other components: instrument cabinets, ordinary valves, pipelines, buffer filters, etc. The external pipeline of the instrument cabinet is made of galvanized pipe, the internal measuring pipeline of the instrument cabinet is made of hose or stainless steel pipe with a pressure resistance greater than 1MPa, and the buffer is made of 100mm stainless steel pipe.

4. Monitoring gas introduction method: The gas is introduced by the oil pipe, and enters the measurement pipeline through ordinary valves, gas flow controllers, explosion-proof solenoid valves, and buffer filters. The measurement pipeline extends 20-30m outward, and the end of the pipeline is about 3m high, and it is connected to the atmosphere. , The pressure inside the measuring pipeline is ±10% of the atmospheric pressure. 5.

On-line monitoring data analysis and statistics device, collecting and displaying the relevant parameters of the detected gas, and storing the data in the database, with real-time alarm, curve drawing, data query and other functions.

(1) Safety monitoring limit alarm. Track the changes of monitoring data in real time. When the monitoring information of the device reaches the limit value of safety monitoring, the device will automatically trigger the alarm function, notify relevant personnel, and take measures to eliminate hidden dangers of accidents.

(2) Security monitoring information trend warning and limit prediction. By establishing a mathematical model, real-time analysis and monitoring information change trends, when the relevant indicators show an upward trend or a sharp change in the relevant indicators, timely warning information is issued, and the safety limit time is predicted.

(3) Statistical analysis of detection information. Realize the query and display of detection historical data, and use the monitoring information to automatically generate monitoring information shift reports, daily reports, and monthly reports.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (6)

1. An on-line detection device for air foam flooding produced gas, characterized in that the explosion-proof power supply (1) is connected to a flow controller (4), an electromagnetic control valve (5), O ₂ , CO, CO ₂ and combustible gas detection Transmitter (10), GPRS network device (12) and all pipeline insulation and heating devices provide power supply; wellhead casing gas is introduced into flow controller (4) through induction pipe (2), and the other end of flow controller (4) Connect the electromagnetic control valve (5) through the pipeline, the other end of the electromagnetic control valve (5) is connected to the buffer tank (6) through the pipeline, the bottom of the buffer tank (6) is connected to the solenoid valve (8), and the upper pipe of the buffer tank (6) Connect the gas filter (9), the other end of the gas filter (9) is connected to the O ₂ , CO, CO ₂ and combustible gas detection transmitter (10) through the pipeline, O ₂ , CO, CO ₂ and combustible gas detection The transmitter (10) is connected to the data collector (11), and the data collector (11) collects and transmits test data to the GPRS network device (12) and transmits it to the computer software device (7) in the monitoring room. 2. An air foam flooding oil production gas online detection process, characterized in that it contains the following steps; through the explosion-proof power supply (1) to the flow controller (4), electromagnetic control valve (5), O ₂ , CO, CO ₂ and combustible gas detection transmitter (10), GPRS network device (12), all pipeline heat preservation and heating devices provide power; The reasonable flow rate and gas pressure are controlled by the internal flow sensor and pressure sensor. When the flow rate and pressure meet the set value, the gas is introduced into the buffer tank (6) through the pipeline and the electromagnetic control valve (5). The buffer tank (6) is designed There is a gas-liquid separator. When there is liquid in the buffer tank (6) and reaches a certain amount, the solenoid valve (8) at the bottom of the buffer tank (6) will automatically open to discharge the liquid, and the gas at the top of the buffer tank (6) will pass through The upper pipe of the buffer tank (6) introduces a gas filter (9) to further filter the gas, and the filtered gas is introduced into _O2 , CO, _CO2 and combustible gas detection transmitter (10) for detection, wherein the combustible gas detector The combustible gas in the ambient atmosphere of the construction site is detected in real time, and the monitoring signal is collected by the data collector (11) and the test data is transmitted to the GPRS network device (12) and transmitted to the computer software device (7) in the monitoring room, and then transmitted to the computer software device (7) in the monitoring room. The software device (7) processes, analyzes and reports the received data. If the detected data exceeds the alarm value, the computer software device (7) will send out an alarm signal, and at the same time send maintenance instructions to on-site personnel for cooperation through the detection equipment failure alarm deal with. 3. An on-line monitoring device for air foam flooding produced gas, characterized in that it includes an explosion-proof power supply (1), a flow controller (4), an electromagnetic control valve (5), O ₂ , CO, CO ₂ and combustible gas Detection transmitter (10), GPRS network device (12), pipeline insulation heating device and buffer tank (6), the explosion-proof power supply (1) and the flow controller (4), the electromagnetic control valve ( 5), the O ₂ , CO, CO ₂ and combustible gas detection transmitter (10), the GPRS network device (12) and the pipeline insulation heating device are electrically connected; The first end of the flow controller (4) is connected to the inlet, the first end of the electromagnetic control valve (5) is connected to the second end of the flow controller (4), and the electromagnetic control valve (5) ) is connected to the buffer tank (6), the bottom of the buffer tank (6) is connected to a solenoid valve (8), and the buffer tank (6) is connected to the O ₂ , CO, CO ₂ and combustible gas The detection transmitter (10) is connected, and the _O2 , CO, _CO2 and combustible gas detection transmitter (10) is connected with the GPRS network device (12). 4. The air-foam flooding produced gas online monitoring device according to claim 3, characterized in that, the air-foam flooding produced gas online monitoring device also includes a filter (9), and the filter (9 ) is connected between the buffer tank (6) and the O ₂ , CO, CO ₂ and combustible gas detection transmitters (10) through pipelines. 5. The on-line monitoring device for air-foam flooding produced gas according to claim 4, characterized in that the communication position between the filter (9) and the buffer tank (6) is located in the buffer tank (6) the top of. 6. The air-foam flooding oil production gas online monitoring device according to claim 3, characterized in that, the air foam flooding oil production gas online monitoring device also includes a data collector (11), the O ₂ , CO, _CO and combustible gas detection transmitters (10) are connected with the data collector (11), and the data collector (11) collects test data and transmits them to the GPRS network device (12) and transmits To the computer software device (7) in the monitoring room.