A method for identifying production status of fire flooding oil wells in a linear well network

Abstract

The present invention discloses a method for identifying the production status of a fire-driven oil well in a linear well network. The method comprises the following steps: collecting the output oleic acid value and the tail gas CO2 content of the production well; dividing the output oleic acid value and the tail gas CO2 content into intervals; establishing a two-dimensional rectangular coordinate system, with the horizontal axis showing the output oleic acid value and the vertical axis showing the tail gas CO2 content, and drawing an intersection diagram according to the interval division result; calculating the production gas-liquid ratio of the fire-driven oil well; marking the production gas-liquid ratio in the intersection diagram; analyzing the production status reflected by each mark, and recommending corresponding control measures; establishing a dual-coordinate system fire-driven oil well production status rapid identification chart based on the output oleic acid value, the tail gas CO2 content and the production gas-liquid ratio; obtaining the output oleic acid value, the tail gas CO2 content and the production gas-liquid ratio and the production status reflected by each mark through the dual-coordinate system fire-driven oil well production status rapid identification chart, quickly obtaining corresponding recommended control measures, performing identification, and further improving the fire-driven development effect.

Description

Technical Field

[0001] The invention belongs to the technical field of fire-driven oil layer exploitation in heavy oil reservoirs, and particularly relates to a method for identifying the production status of fire-driven oil wells in a linear well pattern. Background Art

[0002] Burning oil reservoirs is a thermal recovery method that improves oil recovery. It offers low cost, low energy consumption, high oil displacement efficiency, wide adaptability, and promising prospects, and can also improve the quality of produced oil. However, fire flooding is accompanied by complex physical and chemical changes, and the oil displacement mechanism is complex (including steam flooding, hot water flooding, flue gas flooding, etc.). Control is difficult during implementation, resulting in a low field success rate.

[0003] Producing wells within the fireflooding field test area exhibit diverse production characteristics, reflecting the impact of fireflooding underground on production dynamics. In daily production management, a key issue is how to identify production issues within a well using its characteristic indicators. Current methods focus on analyzing fireflooding status by category and parameter before making decisions. There are few rapid diagnostic methods that directly integrate various factors to determine fireflooding status and based on well production indicators. Existing fireflooding status control methods are difficult, and fireflooding status identification cannot provide timely processing and decision-making. Summary of the Invention

[0004] The object of the present invention is to provide a method for identifying the production status of fire-driven oil wells in a linear well pattern, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: a method for identifying the production status of fire flooding oil wells in a linear well network,

[0006] The identification method comprises the following steps:

[0007] S1: Collect the oil acid value and tail gas CO2 content of the production well;

[0008] S2: dividing the output oil acid value and tail gas CO2 content into intervals;

[0009] S3: establishing a two-dimensional rectangular coordinate system, with the horizontal axis showing the output oleic acid value and the vertical axis showing the tail gas CO2 content, and drawing an intersection diagram according to the interval division results;

[0010] S4: Calculate the gas-liquid ratio of the fire flooding oil well;

[0011] S5: marking the production gas-liquid ratio in the intersection diagram;

[0012] S6: Analyze the production status reflected by each marker and recommend corresponding control measures;

[0013] S7: establishing a dual-coordinate system fire flooding oil well production status rapid identification chart based on the produced oil acid value, tail gas CO2 content and production gas-liquid ratio;

[0014] S8: Obtain the produced oil acid value, tail gas CO2 content, production gas-liquid ratio, and production status reflected by each mark through the dual-coordinate system fire flooding oil well production status rapid identification chart, quickly obtain corresponding recommended control measures, and perform identification.

[0015] Furthermore, the interval division is specifically as follows: the oleic acid value and carbon dioxide content are divided into intervals in combination with the fire flooding production effect well classification evaluation standard.

[0016] Furthermore, the output oleic acid value is an experimental output oleic acid value of a laboratory fire flooding physical simulation and an on-site output oleic acid value. The fire flooding physical simulation experiment determines the range of variation of the output oleic acid value during the production process. The experimental output oleic acid value is combined with the on-site output oleic acid value to judge the state of the fire line advancement.

[0017] Furthermore, the dual-coordinate system fire flooding oil well production status rapid identification chart includes two coordinates: a vertical axis showing the carbon dioxide content and a horizontal axis showing the output oleic acid value, and the production gas-liquid ratio is marked in each small area.

[0018] Furthermore, the carbon dioxide content and the produced oleic acid value are evenly divided into three intervals from small to large, forming nine small areas of the dual-coordinate system fire flooding oil well production status rapid identification chart.

[0019] Furthermore, the production gas-liquid ratio is divided into two levels, high and low, and the two levels are marked in the nine small areas.

[0020] Furthermore, the nine small areas divided according to the carbon dioxide content and the output oil acid value are respectively a high tail gas CO2 content and low output oil acid value area, a high tail gas CO2 content and medium output oil acid value area, a high tail gas CO2 content and high output oil acid value area, a medium tail gas CO2 content and low output oil acid value area, a medium tail gas CO2 content and medium output oil acid value area, a medium tail gas CO2 content and high output oil acid value area, a low tail gas CO2 content and low output oil acid value area, a low tail gas CO2 content and medium output oil acid value area and a low tail gas CO2 content and high output oil acid value area.

[0021] Furthermore, the small area is marked with at most two marks, and the two marks correspond to two production states and corresponding recommended solutions.

[0022] The technical effects and advantages of the present invention are as follows: the linear well pattern fire-flooding oil well production status identification method uses three intervals to divide two production indicators (tail gas CO2 content and output oil acid value), and the division results of the two production indicators are plotted in a dual coordinate system to form nine identification areas. Within each interval, the production gas-liquid ratio is marked as high and low. Different marks correspond to different fire-flooding production status machines and recommend control measures. Based on the chart, not only can the fire-flooding production status reflected by the production indicators of various oil wells be quickly analyzed, but corresponding control measures can also be recommended based on the production status, such as gas enhancement and efficiency improvement, air transfer and fire connection, control and shutdown, downstream replacement, wet burning, etc., further improving the fire-flooding development effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a flow chart of the method for identifying the production status of a fire flooding oil well in a linear well network of the present invention;

[0024] Figure 2 This is a schematic diagram of a dual-coordinate system fire flooding oil well production status rapid identification chart of the present invention. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] The present invention provides Figure 1 A method for identifying the production status of fire-driven oil wells in a linear well network is shown.

[0027] The identification method includes the following steps: collecting the output oleic acid value and tail gas CO2 content of the production well; dividing the output oleic acid value and tail gas CO2 content into intervals; establishing a two-dimensional rectangular coordinate system, with the horizontal axis showing the output oleic acid value and the vertical axis showing the tail gas CO2 content, and drawing an intersection diagram according to the interval division result; calculating the production gas-liquid ratio of the fire-driven oil well; marking the production gas-liquid ratio in the intersection diagram; analyzing the production status reflected by each mark and recommending corresponding control measures; establishing a dual-coordinate system fire-driven oil well production status rapid identification chart based on the output oleic acid value, tail gas CO2 content and production gas-liquid ratio; obtaining the output oleic acid value, tail gas CO2 content, production gas-liquid ratio and the production status reflected by each mark through the dual-coordinate system fire-driven oil well production status rapid identification chart, obtaining corresponding recommended control measures, and performing identification.

[0028] The interval division is specifically as follows: combining the fire flooding production effect well classification evaluation standard, the produced oil acid value and tail gas CO2 content are divided into intervals.

[0029] The output oleic acid value is the output oleic acid value from a laboratory fire flooding physical simulation experiment and the field output oleic acid value. The fire flooding physical simulation experiment determines the range of variation of the output oleic acid value during the production process. The experimental output oleic acid value is combined with the field output oleic acid value to determine the progress of the fire line.

[0030] The dual-coordinate system fire flooding oil well production status rapid identification chart includes two coordinates: a vertical axis showing the carbon dioxide content and a horizontal axis showing the produced oleic acid value.

[0031] The carbon dioxide content and the output oleic acid value are evenly divided into three intervals from small to large, forming nine small areas of the dual-coordinate system fire flooding oil well production status rapid identification chart, and the production gas-liquid ratio is marked in each small area.

[0032] The production gas-liquid ratio represents the quality of development indicators. The production gas-liquid ratio is calculated based on the on-site production data of fire flooding. Combined with the classification and evaluation standards for fire flooding production effect wells, the production gas-liquid ratio is divided into two levels, high and low. The two levels are marked in the nine small areas.

[0033] The nine small areas are respectively the high tail gas CO2 content and low output oil acid value area, the high tail gas CO2 content and medium output oil acid value area, the high tail gas CO2 content and high output oil acid value area, the medium tail gas CO2 content and low output oil acid value area, the medium tail gas CO2 content and medium output oil acid value area, the medium tail gas CO2 content and high output oil acid value area, the low tail gas CO2 content and low output oil acid value area, the low tail gas CO2 content and medium output oil acid value area and the low tail gas CO2 content and high output oil acid value area.

[0034] In the area with high tail gas CO2 content and low produced oil acid value, the low production gas-liquid ratio mark indicates that the oil wall is far away from the production well and is in a high-temperature combustion state. The recommended measure is steam injection. The high production gas-liquid ratio mark indicates that the oil wall is far away from the production well. The recommended measures are: ① if the oil well is in the early stage of production, reduce the gas injection rate; ② if the oil well is in the middle and late stages of production, use steam injection or pressure circulation fire flooding.

[0035] A low production gas-liquid ratio mark in the oil acid value area with high tail gas CO2 content indicates that the production status is excellent and no additional measures are required; a high production gas-liquid ratio mark indicates abnormal advancement of the combustion front. The recommended measures are: ① if the oil well is in the early stage of production, reduce the gas injection rate; ② if the oil well is in the middle and late stages of production, continue monitoring.

[0036] In the area with high tail gas CO2 content and high oil acid value, a low production gas-liquid ratio mark indicates that the fire line is close to the production well, production is normal, and the produced liquid temperature is continuously monitored. A high production gas-liquid ratio mark indicates that the oil wall is close to the production well and the high-temperature combustion state is good. The recommended measures are: ① If the oil well is in the early stage of production, gas channeling may have occurred, and profile adjustment is recommended; ② If the oil well is in the middle and late stages of production, continuously monitor the produced liquid temperature and be prepared for production takeover.

[0037] In the area with low tail gas CO2 content and produced oil acid value, the low production gas-liquid ratio mark indicates the early stage of effectiveness, and the recommended measure is no additional measures. The high production gas-liquid ratio mark means that the oil wall is far away from the production well and the combustion state is normal. The recommended measures are: ① If the oil well is in the early stage of production, continue monitoring; ② If the oil well is in the middle and late stages of production, pressure circulation fire flooding is recommended.

[0038] In the area of ​​the produced oil acid value in the medium tail gas CO2 content, the low production gas-liquid ratio mark indicates that the production status is normal, and the recommended measure is that no additional measures are required; the high production gas-liquid ratio mark indicates that the production status is normal, and the recommended measure is to appropriately reduce the gas injection volume.

[0039] In the area with high tail gas CO2 content and high oil acid value, the low production gas-liquid ratio mark indicates that the combustion front is approaching the production well, and the recommended measure is to shut down the well and move the air to connect the fire; the high production gas-liquid ratio mark indicates that the fire line is approaching and gas channeling is occurring. The recommended measures are: ① if the oil well is in the early stage of production, it is recommended to adjust the profile; ② if the oil well is in the middle and late stages of production, it is recommended to appropriately reduce the gas injection rate.

[0040] In the area with low tail gas CO2 content and low oil acid value, the low production gas-liquid ratio mark indicates that the combustion state is poor, and the recommended measure is to increase gas efficiency; the high production gas-liquid ratio mark indicates that the combustion state is poor and there are high permeability channels. The recommended measures are: ① If the oil well is in the early stage of production, it is recommended to increase the gas injection volume; ② If the oil well is in the middle and late stages of production, it is recommended to control and shut down the gas.

[0041] In the area of ​​oil acid value produced in the low tail gas CO2 content, the low production gas-liquid ratio mark indicates normal effect but poor combustion state. The recommended measure is to change the gas injection rate through pressure circulation and observe the response of the production well; the high production gas-liquid ratio mark indicates gas channeling and poor combustion state. The recommended measure is to take control or profile adjustment.

[0042] In the area with low tail gas CO2 content and high oil acid value, the low production gas-liquid ratio mark indicates that the fire line is close to the production well and the combustion state is poor. The recommended measures are to continuously monitor the production liquid temperature and oxygen content, and to shut down the well and move the air to connect the fire when necessary; the high production gas-liquid ratio mark indicates excessive gas channeling, and the recommended measures are to shut down the well and move the air to connect the fire.

[0043] The small area is marked with at most two marks, and the two marks correspond to two production states and corresponding recommended solutions.

[0044] The linear well network drive oil well production status identification method uses three intervals and two production indicators (exhaust gas CO2 content and output oil acid value) for division, and the division results of the two production indicators are plotted in dual coordinates to form nine identification areas. The production gas-liquid ratio is marked as high and low within each area, and different marks correspond to different fire drive production states and recommended control measures. The chart formed by the linear well network drive oil well production status identification method can not only quickly analyze the fire drive production status reflected by various oil well production indicators, but also recommend corresponding control measures for different production states. The chart formed by the linear well network drive oil well production status identification method can be widely used for the rapid identification of oil well production status during linear well network fire drive, and can quickly and conveniently propose recommended control measures to improve the fire drive development effect.

[0045] Example

[0046] The present invention discloses a method for identifying the production status of fire-driven oil wells in a linear well pattern. The method establishes a corresponding chart for the production status identification method of fire-driven oil wells in a linear well pattern. The chart effectively determines the advancement of the fire line based on changes in the produced oleic acid value and quickly determines the combustion status based on the tail gas CO2 content. The production gas-liquid ratio reflects the development efficiency. In combination with the classification and evaluation standards for fire-driven production wells in a demonstration block (as shown in Table 1), the chart organizes the changes in the produced oleic acid value and tail gas CO2 content of the oil well into three intervals, forming nine identification regions in a two-dimensional rectangular coordinate system. The production gas-liquid ratio is then marked in different regions according to high and low levels. The fire-driven production status (poor combustion, overfire gas channeling, gas channeling, normal displacement, slow sweep, seepage barrier, etc.) reflected by the different marks in the nine identification regions formed in the coordinate system is then determined, and corresponding recommended control measures (gas enhancement and efficiency, air transfer and fire connection, control and shutdown, downstream relay, pressure cycling, etc.) are provided.

[0047] Table 1 Classification and evaluation criteria for fire flooding production effect wells

[0048]

[0049] The linear well network fire-driven oil well production status identification method includes the following steps: collecting the output oleic acid value and tail gas CO2 content of the production well; dividing the output oleic acid value and tail gas CO2 content into intervals; establishing a two-dimensional rectangular coordinate system, with the horizontal axis showing the output oleic acid value and the vertical axis showing the tail gas CO2 content, and drawing an intersection diagram according to the interval division result; calculating the production gas-liquid ratio of the fire-driven oil well; marking the production gas-liquid ratio in the intersection diagram; analyzing the production status reflected by each mark and recommending corresponding control measures; establishing a dual-coordinate system fire-driven oil well production status rapid identification chart based on the output oleic acid value, tail gas CO2 content and production gas-liquid ratio; obtaining the output oleic acid value, tail gas CO2 content, production gas-liquid ratio and the production status reflected by each mark through the dual-coordinate system fire-driven oil well production status rapid identification chart, obtaining corresponding recommended control measures, and performing identification.

[0050] The acid value of the produced oil is obtained based on the chart and used to judge the advancement status of the combustion front. In dry fire drive combustion chamber experiments and new mine practices, the acid value of the produced oil and the position of the combustion front show a nearly linear relationship. The closer the fire drive front is to the production end, the higher the acid value of the produced oil. At the beginning of fire drive, the produced oil has a base acid value. After the combustion front sweeps the entire distance between the injection and production wells, the produced oil has the highest acid value. The linear relationship between the acid value of the produced oil and the well spacing is as follows:

[0051]

[0052] Among them A max is the highest acid value, A o is the basic acid value, L is the distance between injection and production wells, A is the acid value monitoring value at a certain moment, X f is the distance between the fire line and the gas injection well.

[0053] For example, if the distance between well hH021 and the gas injection well is 90 m, the basic acid value is 4.5 mg·KOH / g, and the maximum acid value is 13 mg·KOH / g (obtained in the laboratory), the established relationship is:

[0054] A=0.0944X+4.5

[0055] Where A is the oleic acid value produced during a certain period, mg·KOH / g; X is the distance between the firing line and the gas injection well, m.

[0056] According to the relationship between the oleic acid value and the position of the combustion front, the relationship between the output oleic acid value and the fire line speed is shown in Table 2:

[0057] Table 2 Correspondence between oil acid value and firing speed

[0058]

[0059] The faster the fire line speed, the faster the combustion front approaches the production well, and the higher the oleic acid value produced, the more serious the gas channeling will be; the slower the fire line speed, the slower the combustion front moves away from the gas injection well, and the lower the oleic acid value produced, and the slower the effect will be; when the fire line speed is moderate, the combustion front advances moderately toward the production well, and the oleic acid value produced is moderate, the effect is good at this time, which is a normal state.

[0060] The combustion state can be quickly determined based on the exhaust CO2 content. A high CO2 content (>14%) indicates a good combustion state, a medium CO2 content (8% to 14%) indicates a normal combustion state, and a low CO2 content (<8%) indicates a poor combustion state. The exhaust CO2 content is correlated with the carbon monoxide (CO) content. The corresponding relationship between exhaust CO concentration and CO2 content is shown in Table 3:

[0061] Table 3 Corresponding relationship between tail gas CO concentration and CO2 content

[0062]

[0063] The production gas-liquid ratio reflects the development benefit. The fire flooding production status is judged according to the production gas-liquid ratio. In combination with Table 1, the fire flooding production effect is classified into two levels according to the production gas-liquid ratio, high and low. The classification results are shown in Table 4:

[0064] Table 4 Corresponding relationship of production gas-liquid ratio interval

[0065]

[0066] A two-dimensional rectangular coordinate system is established, in which the horizontal axis is the output oleic acid value and the vertical axis is the tail gas CO2 content.

[0067] By plotting the three intervals of the output oil acid value and the tail gas CO2 content in the rectangular coordinate system, nine identification areas can be formed, such as Figure 2 shown.

[0068] The nine identification areas are marked with production gas-liquid ratios, and targeted control measures are proposed based on specific situation analysis. The nine identification areas are: high tail gas CO2 content and low output oil acid value area, high tail gas CO2 content and medium output oil acid value area, high tail gas CO2 content and high output oil acid value area, medium tail gas CO2 content and low output oil acid value area, medium tail gas CO2 content and medium output oil acid value area, medium tail gas CO2 content and high output oil acid value area, low tail gas CO2 content and low output oil acid value area, low tail gas CO2 content and medium output oil acid value area and low tail gas CO2 content and high output oil acid value area.

[0069] (1) Region 1—High tail gas CO2 content and low oil acid value region

[0070] ① Low production gas-liquid ratio mark: This mark reflects that the oil wall is far away from the production well, the high-temperature combustion state is good, and the production is normal. Continuous monitoring of production dynamics is sufficient.

[0071] ② High production gas-liquid ratio mark: This mark reflects that the oil wall is far away from the production well and the high-temperature combustion state is good. If the oil well is in the early stage of production, it is a normal production state. If the oil well is in the middle and late stages of production, the high production gas-liquid ratio may be caused by the high viscosity of the underground crude oil or the development of a seepage barrier. Steam stimulation or pressure circulation fire drive should be used.

[0072] (2) Region 2—Oil acidity region with high tail gas CO2 content

[0073] ① Low production gas-liquid ratio mark: This mark indicates that the production status is good, reflecting a good combustion state and effectiveness. No measures are required under this mark, and production dynamics must be continuously monitored.

[0074] ② High production gas-liquid ratio mark: This mark indicates that the combustion state is good, reflecting a good combustion state and effectiveness. If the oil well is in the middle and late stages of production, it is a normal production state. If the oil well is in the early stages of production, high permeability channels may develop underground, resulting in rapid advancement of the combustion front and a high production gas-liquid ratio. The gas injection volume should be reduced.

[0075] (3) Region 3 - High tail gas CO2 content and high oil acid value region

[0076] ① Low production gas-liquid ratio mark: This mark indicates that the fire line is close to the production well, the high-temperature combustion state is good, and production is normal. Continuously monitor the output liquid temperature and be prepared for production takeover.

[0077] ② High production gas-liquid ratio mark: This mark indicates that the fire line is close to the production well and the high-temperature combustion state is good. If the oil well is in the middle and late stages of production, it is a normal production state. Continuously monitor the output liquid temperature and make preparations for production replacement. If the oil well is in the early stages of production, gas channeling may have occurred, causing the combustion front to advance too quickly and the production gas-liquid ratio to be high. Measures such as foam profile adjustment should be taken according to the situation.

[0078] (4) Region 4 - Low tail gas CO2 content and low oil acid value region

[0079] ① Low production gas-liquid ratio mark: This mark reflects that the oil wall is far away from the production well and the combustion status is normal. Continuous monitoring of production dynamics is sufficient.

[0080] ② High production gas-liquid ratio mark: This mark reflects that the oil wall is far away from the production well and the combustion state is normal; if the oil well is in the early stage of production, it is a normal production state; if the oil well is in the middle and late stages of production, a seepage barrier may develop underground, resulting in a slow approach of the fire line, and pressure circulation fire drive should be adopted.

[0081] (5) Region 5 - Medium tail gas CO2 content and medium oil acidity value region

[0082] ① Low production gas-liquid ratio mark: The production status is normal, the combustion front is in a stable advancing state, and continuous monitoring of production dynamics is sufficient.

[0083] ② High production gas-liquid ratio mark: The production status is normal, the combustion front is in a stable advancing state, but the gas-liquid ratio is high, which can reduce the gas injection volume and improve the production effect.

[0084] (6) Area 6 - High tail gas CO2 content and high oil acidity value area

[0085] ① Low production gas-liquid ratio mark: This mark indicates that the fire line is approaching the production well and the combustion state has a trend of deterioration. Monitor the output liquid temperature in time and be prepared for production takeover.

[0086] ② High production gas-liquid ratio mark: This mark indicates that the fire line is close to the production well and the combustion state is basically normal; if the oil well is in the middle and late stages of production, it is a normal production state and the gas injection volume can be appropriately reduced; if the oil well is in the early stages of production, gas channeling may have occurred, resulting in a high production gas-liquid ratio and too fast advancement of the combustion front, and measures such as air foam profile adjustment should be taken.

[0087] (7) Area 7 - Low tail gas CO2 content and low oil acid value area

[0088] ① Low production gas-liquid ratio mark: This mark reflects that the oil wall is far away from the production well, the high-temperature combustion state is poor, and gas enhancement and efficiency improvement are needed to improve the combustion state.

[0089] ② High production gas-liquid ratio mark: This mark reflects that the oil wall is far away from the production well and the high-temperature combustion state is poor. If the oil well is in the early stage of production, it is necessary to further determine whether fire extinguishing occurs and improve the combustion state by changing the gas injection volume. If the oil well is in the middle and late stages of production, gas channeling may have occurred, resulting in low oxygen utilization and a high production gas-liquid ratio. Control and shutdown measures should be taken according to the situation.

[0090] (8) Region 8 - Low tail gas CO2 content and medium oil acidity value region

[0091] ① Low production gas-liquid ratio mark: This mark indicates that the oil well is operating normally, but the combustion state is poor. It has experienced high-temperature combustion in the early stage and the current combustion state is poor. Pressure circulation is required to improve the combustion state.

[0092] ② High production gas-liquid ratio mark: This mark indicates that the current combustion state is poor and the oil well is in the middle and late stages of production. However, it has experienced high-temperature combustion in the early stages and gas channeling may have occurred. Control and shutdown measures should be taken.

[0093] (9) Area 9 - Low tail gas CO2 content and high oil acid value area

[0094] ① Low production gas-liquid ratio mark: This mark indicates that the combustion state deteriorates as the fire line approaches the production well. At this time, there is no need to improve the combustion state. It is necessary to continuously monitor the liquid temperature and oxygen content and be prepared for moving the air and connecting the fire.

[0095] ② High production gas-liquid ratio mark: This mark indicates that the fire line has crossed the production well, which is a state of over-fire gas leakage. It is necessary to shut down the well and move the air to connect the fire.

[0096] By bringing the fire flooding production status (poor combustion, over-fire gas channeling, gas channeling, slow spread, etc.) reflected by the different marks in the nine identification areas and recommending control measures (gas enhancement and efficiency, air transfer and fire connection, control and shut-off, downstream replacement, pressure circulation, foam profile control, low gas injection rate, etc.) into the corresponding identification areas, a chart corresponding to the linear well network fire flooding oil well production status identification method can be established.

[0097] Working Principle: This linear well pattern fire-flooding well production status identification method is based on the fire-flooding production performance well classification and evaluation criteria. It primarily assesses the operating status of fire-flooding production wells based on three aspects: fireline advancement, combustion status, and development indicators. Changes in the produced oil acid value can effectively determine fireline advancement, the tail gas CO2 content can quickly determine combustion status, and the production gas-liquid ratio can reflect development effectiveness and profitability. This method comprehensively considers these three factors to establish a dual-coordinate system for rapid diagnosis of fire-flooding well production status. The method comprises the following steps: collecting the output oleic acid value and tail gas CO2 content of production wells; dividing the output oleic acid value and tail gas CO2 content into intervals; establishing a two-dimensional rectangular coordinate system, with the horizontal axis displaying the output oleic acid value and the vertical axis displaying the tail gas CO2 content, and drawing an intersection diagram according to the interval division result; calculating the production gas-liquid ratio of the fire-driven oil well; marking the production gas-liquid ratio in the intersection diagram; analyzing the production status reflected by each mark, and recommending corresponding control measures; establishing a dual-coordinate system fire-driven oil well production status rapid identification chart based on the output oleic acid value, tail gas CO2 content and production gas-liquid ratio; obtaining the output oleic acid value, tail gas CO2 content and production gas-liquid ratio and the production status reflected by each mark through the dual-coordinate system fire-driven oil well production status rapid identification chart, quickly obtaining corresponding recommended control measures, and performing identification. The chart identifies potential fireflooding conditions (poor combustion, overfire gas channeling, gas channeling, normal displacement, slow spread, etc.). This chart allows for rapid diagnosis of the current fireflooding status and the development of targeted control measures (gas enhancement, air flow transfer, controlled shutoff, downstream replacement, wet burning, etc.). This chart comprehensively considers multiple factors to quickly determine the production status of fireflooding wells and develops targeted control measures to further improve fireflooding development results.

[0098] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for identifying the production status and regulating production of fire-flooded oil wells in a linear well pattern, characterized by: The following steps are involved: S1: Collect the oil acid value and tail gas CO2 content of the production well; S2: dividing the output oil acid value and tail gas CO2 content into intervals; S3: Establish a two-dimensional rectangular coordinate system, with the horizontal axis showing the produced oleic acid value and the vertical axis showing the tail gas CO2 content, and draw an intersection diagram according to the interval division results; the carbon dioxide content and the produced oleic acid value are evenly divided into three intervals from small to large, forming nine small areas of the dual-coordinate system fire flooding oil well production status rapid identification chart, and the production gas-liquid ratio is marked in each small area; S4: Calculate the gas-liquid ratio of the fire flooding oil well; divide the gas-liquid ratio into two levels, high and low, and mark the nine small areas with the two levels; S5: marking the production gas-liquid ratio in the intersection diagram; S6: Analyze the production status reflected by each marker and recommend corresponding control measures; S7: establishing a dual-coordinate system fire flooding oil well production status rapid identification chart based on the produced oil acid value, tail gas CO2 content and production gas-liquid ratio; S8: Obtain the produced oil acid value, tail gas CO2 content, production gas-liquid ratio, and production status reflected by each mark through the dual-coordinate system fire-flooding oil well production status rapid identification chart, and then identify the production status of the fire-flooding oil well and obtain corresponding recommended control measures.

2. The method for identifying the production status and regulating the production of a linear well pattern fire flooding oil well according to claim 1, wherein: The interval division is specifically as follows: combining the fire flooding production effect well classification evaluation standard to divide the produced oil acid value and tail gas CO2 content into intervals.

3. The method for identifying the production status and regulating the production of a linear well pattern fire flooding oil well according to claim 1, wherein: The output oleic acid value is an experimental output oleic acid value obtained from a laboratory fire flooding physical simulation and an on-site output oleic acid value. The fire flooding physical simulation experiment determines the range of variation of the output oleic acid value during the production process. The experimental output oleic acid value is combined with the on-site output oleic acid value to determine the state of the fire line advancement.

4. The method for identifying the production status and regulating the production of a linear well pattern fire flooding oil well according to claim 1, wherein: The dual-coordinate system fire flooding oil well production status rapid identification chart includes two coordinates: a vertical axis showing the carbon dioxide content and a horizontal axis showing the produced oleic acid value.

5. The method for identifying the production status and regulating the production of a linear well pattern fire flooding oil well according to claim 1, wherein: The nine small areas divided according to the carbon dioxide content and the output oil acid value are respectively the high tail gas CO2 content and low output oil acid value area, the high tail gas CO2 content and medium output oil acid value area, the high tail gas CO2 content and high output oil acid value area, the medium tail gas CO2 content and low output oil acid value area, the medium tail gas CO2 content and medium output oil acid value area, the medium tail gas CO2 content and high output oil acid value area, the low tail gas CO2 content and low output oil acid value area, the low tail gas CO2 content and medium output oil acid value area and the low tail gas CO2 content and high output oil acid value area.

6. The method for identifying the production status and regulating the production of a linear well pattern fire flooding oil well according to claim 1, wherein: The small area is marked with at most two marks, and the two marks correspond to two production states and corresponding recommended solutions.

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