Flow-state mineralization automatic monitoring system and method for oil well refined management

Abstract

The invention discloses a flow-state mineralization automatic monitoring system and method for oil well refined management, and the method comprises the steps: collecting a high-frequency water content continuous trend curve through an analyzer installed at an oil well mouth, and analyzing the flow-state change of crude oil in the process of lifting to the ground from a bottom layer; analyzing the influence degree of oil-gas slippage in the lifting process of the oil-gas-water mixture in the shaft; the water in crude oil is sampled and separated at regular time by the water breakthrough well oil-water separation mineralization degree detection part, the mineralization degree value in a produced product is obtained through a mineralization degree detector, and whether the produced water is from injection water or formation water is analyzed and judged. An intelligent oil well classification method is obtained through detailed oil well flow state deep analysis, and the intelligent oil well classification method is also divided into four types of oil wells including non-water-breakthrough oil displacement effect stable wells, non-water-breakthrough regular light slippage wells, non-water-breakthrough serious slippage wells and water-breakthrough flooding and slug flow wells. And more targeted working modes and management measures are respectively formulated according to the four well conditions.

Description

Technical Field

[0001] The invention belongs to the field of oilfield exploitation, and in particular relates to an automatic monitoring system and method for fluid mineralization of refined oil well management. Background Art

[0002] In order to extend the oil well production cycle and improve the oil well recovery rate, the oil field classifies and manages the oil wells under different working conditions, and implements the "ABCD classification management method" for the oil wells, that is, the oil wells are divided into four categories according to the liquid production and management difficulty: key wells, stable production wells, potential wells, and low production wells. According to different production characteristics, corresponding management measures are formulated and assessment indicators are quantified. Specific classification method Category A: single well production is high (d≥5t) and water content is low; Category B: single well production is medium (5t>d≥3t) and water content is low; Category C: single well production is low (3t>d≥1t) and water content is high; Category D: single well production is low (d<1t) and water content is high.

[0003] This classification method is a static management mode, which cannot grasp the dynamic changes of oil wells in time. It is necessary to distinguish the frequency and periodicity according to the importance of the categories to focus on the implementation of dynamic production data such as water content and single well production. The water content is a rough classification management method with a range of high, medium and low. It is difficult to rely on manual sampling and statistical methods. At the same time, it is necessary to analyze the historical performance diagram of the oil wells and the dynamic curve of production output, and reasonably optimize the production parameters through water injection, and take different governance measures to tap the potential of various types of oil wells. From the perspective of the full life cycle management of oil wells, the recovery rate is an important indicator to measure the level of oil field development. The recovery rate is related to the reservoir lithology, physical properties, heterogeneity, fluid properties and driving type. In particular, water injection development of oil wells requires real-time grasp of the gas-liquid flow diversion and flow pattern changes and fluidity changes of the oil wells. The development of low-permeability oil fields requires full use of the low-permeability fluidity energy of the reservoir. The increase in liquid production is often caused by the increase in the flow aperture of the high-permeability layer of the oil well, the formation or the intrusion of injected water. In particular, water injection development is the best effect to supplement the oil layer pressure without water displacement. Without a specific analysis of the components of the output fluid, the water injection development and oil displacement effect cannot be reflected. The components of crude oil extracted from the oil well are a mixture of oil, gas and water. The liquid flow is water in addition to oil. In the process of lifting the oil, gas and water mixture from the formation to the ground, due to the influence of the slippage effect in the wellbore, the different slippage speeds of the oil, gas and water mixture in the wellbore cause a great change in its flow pattern during the lifting process in the wellbore, resulting in a large difference in the instability of the liquid discharge conditions at the ground wellhead.

[0004] The water component of the oil-gas-water mixture comes from groundwater and injected water. With the continuous development of oil wells, the water content continues to increase, which is mainly caused by the water invasion of formation water and injected water into the reservoir. The main difference between formation water and injected water is the difference in mineralization. The mineralization of formation water is generally greater than 10,000 mg / L, and that of injected water is generally less than 1,000 mg / L. Therefore, in order to improve the recovery rate of oil wells and improve the level of refined management of oil wells, it is necessary to timely grasp the changes in the flow state of the produced water and the source of the water component therein. Summary of the invention

[0005] The purpose of the present invention is to provide an automatic monitoring system and method for fluid mineralization for refined management of oil wells, so as to extend the exploitation period of oil wells, improve the recovery rate of oil wells, and classify and manage oil wells under different working conditions.

[0006] The purpose of the present invention is to achieve an automatic monitoring system for fluid mineralization of oil wells through the following technical means, including:

[0007] A first three-way valve comprises a first inlet, a second outlet and a third outlet, wherein the first inlet is connected to an oil wellhead pipeline through a pipeline for collecting fluid from the wellhead, and the second outlet is connected to an external device;

[0008] A flow meter, connected to the pipeline between the first inlet and the wellhead pipeline of the oil well, for detecting the real-time water content of the crude oil;

[0009] a stationary container, wherein the top inlet is connected to the third outlet through a pipe;

[0010] a second three-way valve, comprising a second inlet, a fourth outlet and a fifth outlet, wherein the second inlet is connected to the bottom outlet of the stationary container, and the fourth outlet is connected to the external sleeve;

[0011] A mineralization detector, one end of which is connected to the fifth inlet of the second three-way valve, and the other end of which is connected to the external casing;

[0012] The controller is respectively connected with the first three-way valve, the flow meter, the second three-way valve and the mineralization detector by electrical signals.

[0013] The pipeline between the static container and the first three-way valve is also connected with a pressure reducer and a monitoring device, and the monitoring device is used to monitor the oil-water boundary line in the static container, and the monitoring device is connected with the controller by electrical signals.

[0014] The static container is also marked with a lower water level line.

[0015] An automatic monitoring method for fluid mineralization in refined management of oil wells, using an automatic monitoring system for fluid mineralization in refined management of oil wells,

[0016] Water content detection: open the first three-way valve, and the wellhead liquid of the oil well wellhead pipeline is discharged from the third outlet. During this period, the flow meter performs real-time detection of the water content of the wellhead liquid;

[0017] For sampling and testing of salinity, the third outlet of the first three-way valve is opened, and the liquid from the wellhead enters the static container through the pressure-reducing regulating valve. The oil and water in the crude oil from the wellhead are naturally separated. The fifth outlet of the second three-way valve is opened, and the separated water is discharged into the casing after being tested by the salinity detector. After the salinity test is completed, the fifth outlet is closed, and the fourth outlet is opened to completely empty the static container;

[0018] The flow pattern change of crude oil during the lifting process from the bottom to the surface is obtained according to the water content, and the influence of oil and gas slippage during the lifting process of oil, gas and water mixture in the wellbore is analyzed, and at the same time, the effect of water injection and oil recovery is analyzed to see water or not.

[0019] Based on the results of mineralization sampling and testing, it is determined whether the source of produced water is injected water or formation water.

[0020] According to the water content test results and the salinity sampling test analysis results, the gas content, crude oil emulsification stability, slip effect speed, water seepage and water seepage source data are obtained, and the oil wells are divided into:

[0021] Class A stable wells with no water flooding effect have little gas content. There is almost no oil and gas slippage during the lifting process of crude oil from the bottom of the well to the ground. The water content fluctuates within a small range of 5% to 10%, without large fluctuations, which is suitable for continuous oil production without interruption;

[0022] Class B is a regular light slip well with no water. The water content changes regularly in two intervals, one with low water content and the other with high water content. It changes 1-2 times a day and is suitable for staged intermittent pumping to control the start and stop time of the well and gradually reduce the frequency of changes.

[0023] Class C wells with no water slippage are characterized by irregular and frequent changes in water content within two intervals: one with water content and one with high water content, with more than 10 changes per day. They are suitable for staged intermittent pumping control to gradually reduce the frequency of changes. They are suitable for intermittent pumping control and adjusting the start and stop time of wells to gradually reduce the frequency of changes.

[0024] Class D water-seeking and flooded wells and slug flow wells: the instantaneous water cut of water-seeking and flooded wells fluctuates back and forth between 100% and a certain water-cutting section in real time, and the connectivity test of the injection wells blocks the seepage layer; the water cut of slug flow wells is at 0% for a period of time, and then continues for a period of time again in a certain water-cutting section, changing back and forth, and the oil pump is overhauled or the well is shut down for a long time.

[0025] The beneficial effects of the present invention are as follows: the high-frequency water content continuous trend curve is collected by the analyzer to analyze the flow state changes of crude oil during the lifting process from the bottom to the ground, the influence of oil and gas slippage during the lifting of the oil-gas-water mixture in the wellbore is analyzed, and at the same time, whether water is seen in the water injection oil recovery effect or not is analyzed.

[0026] For water-seeping wells, the oil-water separation and mineralization detection part regularly takes samples to separate the water in the crude oil, and passes it through the mineralization detector to obtain the mineralization value of the produced material, and analyzes and determines whether the source of the produced water is injected water or formation water.

[0027] In this way, we can obtain detailed flow data analysis results of the oil wells. Through in-depth analysis of the flow patterns of the detailed oil wells, we can come up with an intelligent oil well classification method, which is also divided into four categories of oil wells, namely, stable wells with no water drive effect, wells with regular slight slippage without water, wells with serious slippage without water, and wells with water flooding and slugging. According to these four well conditions, more targeted work modes and management measures can be formulated. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of an automatic monitoring system for fluid mineralization for refined management of oil wells;

[0029] Figure 2 This is a schematic diagram of the instantaneous water content curve of the No. 1 Class A well;

[0030] Figure 3 This is a schematic diagram of the instantaneous water content curve of the No. 2 Class A well;

[0031] Figure 4 This is a schematic diagram of the water content curve of Class B wells;

[0032] Figure 5 This is a schematic diagram of the water content curve of Class C wells;

[0033] Figure 6 It is a schematic diagram of the instantaneous water content curve of water-flooded wells in Class D wells;

[0034] Figure 7 It is a schematic diagram of the water content curve of the plug flow well in the middle section of the D-type well;

[0035] In the figure, 1 is the first three-way valve; 2 is the flow meter; 3 is the static container; 4 is the second three-way valve; 5 is the mineralization detector; 6 is the controller; 7 is the pressure-reducing regulating valve; and 8 is the monitoring device.

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0037] [Example 1]

[0038] An automatic monitoring system for fluid mineralization for refined management of oil wells, comprising:

[0039] The first three-way valve 1 comprises a first inlet, a second outlet and a third outlet, the first inlet is connected to the oil wellhead pipeline through a pipeline for collecting the wellhead liquid, and the second outlet is connected to an external device;

[0040] A flow meter 2, connected to the pipeline between the first inlet and the wellhead pipeline of the oil well, is used to detect the real-time water content of the crude oil;

[0041] a stationary container 3, wherein the top inlet is connected to the third outlet via a pipeline;

[0042] A second three-way valve 4, comprising a second inlet, a fourth outlet and a fifth outlet, wherein the second inlet is connected to the bottom outlet of the static container 3, and the fourth outlet is connected to the external sleeve;

[0043] A mineralization detector 5, one end of which is connected to the fifth inlet of the second three-way valve 4, and the other end of which is connected to the external casing;

[0044] The controller 6 is connected to the first three-way valve 1, the flow meter 2, the second three-way valve 4 and the mineralization detector 5 via electrical signals respectively.

[0045] The pipeline between the static container 3 and the first three-way valve 1 is also connected with a pressure reducing device and a monitoring device 8, and the monitoring device 8 is used to monitor the oil-water boundary line in the static container 3, and the monitoring device 8 is connected with the controller 6 by electrical signals.

[0046] The static container 3 is also marked with a lower water level line.

[0047] like Figure 1 As shown, the flow meter 2 is installed on the wellhead pipeline of the oil well, and the upper and lower microwave probes detect the real-time water content of the crude oil. The water content acquisition frequency is not less than 5HZ, and the water content value of the droplets flowing through the cross-sectional area of ​​the pipeline can be captured.

[0048] After passing through the flow meter 2, the liquid from the wellhead enters through the first inlet of the first three-way valve 1 and is discharged from the second outlet through the gathering pipeline.

[0049] When the mineralization needs to be tested, the controller 6 closes the second outlet and opens the third outlet, and the liquid from the wellhead enters the static container 3 after passing through the step-down regulating valve and the sampling pipeline; when the liquid in the static container 3 is sufficient, the third outlet is closed and the second outlet is opened.

[0050] The liquid from the wellhead is allowed to stand and stratify in the static container 3, with the oil layer on the upper side and the water layer on the lower side. The oil layer is black and the water layer is colorless, so the dividing line is very clear. The monitoring device 8 is a camera, which is used to monitor the oil-water dividing line. When the dividing line is clear and is above the lower water level line on the static container 3, the second inlet and the fifth outlet of the second three-way valve 4 are opened, and the stratified water sample enters the mineralization detector 5 from the fifth outlet, and then the tested water sample is discharged into the casing.

[0051] As the test progresses, the oil-water boundary line drops. When it drops to the lower water level line, in order to prevent the oil sample from entering the mineralization detector 5, the fifth outlet of the second three-way valve 5 is closed, and the fourth outlet is opened. The remaining oil sample and water sample in the static container 3 are directly discharged into the casing, and the container is emptied to wait for the next test.

[0052] The controller 6 receives the remote signal and the image of the camera, and controls the start-up of the flow meter 2 and the mineralization detector 5 , as well as the switching of the outlets of the first three-way valve 1 and the second three-way valve 4 .

[0053] An automatic monitoring method for fluid mineralization in refined management of oil wells, using an automatic monitoring system for fluid mineralization in refined management of oil wells,

[0054] Water content detection: open the first three-way valve 1, and the wellhead liquid of the oil well wellhead pipeline is discharged from the third outlet. During this period, the flow meter 2 performs real-time detection of the water content of the wellhead liquid;

[0055] For sampling and testing of salinity, the third outlet of the first three-way valve 1 is opened, and the liquid from the wellhead enters the static container 3 through the step-down regulating valve 7. The oil and water in the crude oil from the wellhead are naturally separated. The fifth outlet of the second three-way valve 4 is opened, and the separated water is discharged into the casing after being tested by the salinity detector 5. After the salinity test is completed, the fifth outlet is closed, and the fourth outlet is opened to completely empty the static container 3;

[0056] The oil, gas and water mixture of the oil layer of the oil well is lifted from the formation to the ground. The flow state in the vertical oil pipe wellbore is constantly changing. Under the action of pressure energy, the crude oil flows upward from the bottom of the well along the wellbore. When the pressure in the wellbore is higher than the saturation pressure of the crude oil, the liquid flow is a single-phase pure oil flow, and the water in the crude oil is a fully emulsified oil-water mixture flow. At this time, the natural gas is completely dissolved in the oil. During the rising process of the pure oil flow in the wellbore, the pressure gradually decreases, and the natural gas dissolved in the crude oil begins to escape. Since the density of the gas phase is significantly lower than the density of the liquid phase, the flow speed of the gas phase will be faster than the liquid phase in the rising flow. This flow of the gas phase exceeding the liquid phase is called slippage. Due to the different properties of the oil layers in different wells and the different working modes of parameters such as the oil well pump diameter, sinking degree, stroke and stroke, the slippage speed flow state in the lifting process of each well in the wellbore is different, and there will be multiple sections of oil and gas slippage with different liquid sections, and even some fluids in the wellbore have a fast gas separation speed, which further forms a gas plunger, so that a plunger-like flow state of one section of liquid and one section of gas appears in the wellbore.

[0057] The gas is separated from the crude oil emulsion with small gas content and dispersed in the oil in the form of small bubbles. Since the proportion of bubbles in the wellbore cross section is small, the measured water content changes little. The gas in the crude oil emulsion mixture with large gas content escapes quickly, forming large bubbles that occupy a large wellbore cross-sectional area. At this time, the measured water content changes greatly. The water content of the plunger section formed by gas cannot be monitored to zero. The continuous monitoring of the flow state reaction from the surface wellhead is that the water content changes in a certain section, which is high and low.

[0058] Therefore, through the change of water content, we can infer the flow change of crude oil in the process of lifting from the bottom to the ground, and analyze the influence of oil and gas slippage in the process of lifting the oil, gas and water mixture in the wellbore.

[0059] If the flooding of the well is caused by ground water injection, because the emulsification time of the injected water and crude oil is short and insufficient, the water in the produced fluid lifted to the ground exists in the form of free water, and the flow meter will detect the data of 100% free water and repeated oscillation of the water content of the emulsified crude oil. In addition, the mineralization value of the produced fluid can further determine the source of the water component in the produced material. The total mineralization refers to the total amount of mineral salts dissolved in the water, expressed in mg / L. The mineralization of formation water and surface water is very different. In the dynamic analysis of oil and water wells, it is often determined whether the oil well is injected water or formation water based on the total mineralization and the amount of chloride ions. The total mineralization of formation water is generally greater than 10,000 mg / L, and that of injected water is less than 5,000 mg / L.

[0060] The data from the mineralization detector 5 can be used to determine whether the injection is formation water or surface water.

[0061] Through the above tests, the wells can be quickly tested at the well site, so that different working systems can be formulated according to the fluid production conditions of the wells, the fluid supply capacity can be restored, and the recovery rate can be improved.

[0062] The flow pattern change of crude oil during the lifting process from the bottom to the surface is obtained according to the water content, and the influence of oil and gas slippage during the lifting process of oil, gas and water mixture in the wellbore is analyzed, and at the same time, the effect of water injection and oil recovery is analyzed to see water or not.

[0063] Based on the results of mineralization sampling and testing, it is determined whether the source of produced water is injected water or formation water.

[0064] According to the water content test results and the salinity sampling test analysis results, the gas content, crude oil emulsification stability, slip effect speed, water seepage and water seepage source data are obtained, and the oil wells are divided into:

[0065] Class A stable wells with no water flooding effect have little gas content. There is almost no oil and gas slippage during the lifting process of crude oil from the bottom of the well to the ground. The water content fluctuates within a small range of 5% to 10%, without large fluctuations, which is suitable for continuous oil production without interruption;

[0066] like Figure 2 As shown, Class A wells have a higher production (daily production d≥5t), less water content, and the gas dissolved in crude oil has stable emulsified properties. Low water content and no free water, good oil displacement effect, low water content and no water well; low gas content, is a fully emulsified oil-water mixture flow, the flow state is basically stable and unchanged during the lifting process, and the volume of free gas itself in the oil-gas-water mixture does not change much, so the water content changes in the range of 58% to 62% in a small range, suitable for continuous oil production without interruption.

[0067] Figure 3 Similarly, it stabilized and oscillated within the 15% range in the later period.

[0068] Class B is a regular light slip well with no water. The water content changes regularly in two intervals, one with low water content and the other with high water content. It changes 1-2 times a day and is suitable for staged intermittent pumping to control the start and stop time of the well and gradually reduce the frequency of changes.

[0069] like Figure 4 As shown, Class B wells have medium single well production (5t>d≥3t), low water content, regular oil and gas slippage, regular high water content, and the water content ranges from a low of 5% to a high of 35%. There are regular changes in the two intervals, with 1-2 changes per day.

[0070] You can pump out oil intermittently to see if the slip interval is prolonged and gradually eliminate oil and gas slippage; adjust production parameters to reduce the frequency of high and low changes, reduce the formation rate of emulsion bubbles, reduce the frequency of large bubbles and small bubbles, and stop the well for a short time to pump out oil intermittently.

[0071] Class C wells with no water slippage are characterized by irregular and frequent changes in water content within two intervals: one with water content and one with high water content, with more than 10 changes per day. They are suitable for staged intermittent pumping control to gradually reduce the frequency of changes. They are suitable for intermittent pumping control and adjusting the start and stop time of wells to gradually reduce the frequency of changes.

[0072] like Figure 5 As shown, the single well production of Class C wells is low (3t>d≥1t), the water content is high, and it fluctuates between 20%-70%, and the oscillation is frequent. Similarly, the production parameters are adjusted down, and the wells are stopped for a long time.

[0073] As the production time increases after the parameters are adjusted down, the bottom hole pressure rises, and the production pressure difference of the whole well becomes smaller and smaller. The main oil layers in the old oil fields are basically all high-water-content layers. As the production pressure difference decreases, the pressure of the thin-difference low-water-content oil layers may be close to the bottom hole pressure of the whole well, so the oil production is small or even no oil, and although the production of the high-pressure layer is reduced, it is not greatly affected, resulting in an increase in the water content of the whole well.

[0074] After a certain period of production after the adjustment, the bottom hole pressure of the adjusted oil well is restored, especially when the pressure of the high aquifer is restored to a certain pressure, the bottom hole pressure of the oil well will no longer rise, the water driving force field tends to be stable, the seepage velocity of the injected water in the formation decreases, and the water content tends to be stable.

[0075] Class D water-seeking and flooded wells and slug flow wells: the instantaneous water cut of water-seeking and flooded wells fluctuates back and forth between 100% and a certain water-cutting section in real time, and the connectivity test of the injection wells blocks the seepage layer; the water cut of slug flow wells is at 0% for a period of time, and then continues for a period of time again in a certain water-cutting section, changing back and forth, and the oil pump is overhauled or the well is shut down for a long time.

[0076] like Figure 6 As shown, the well is flooded with water, and the instantaneous water content oscillates back and forth in real time between 100% and a certain water-cut section.

[0077] like Figure 7 As shown, the slug flow well sometimes produces liquid and sometimes does not, that is, the section is full of gas. In terms of water content, it maintains a section with 0 water content and then maintains a section with high water content.

[0078] Through the above detection methods and classifications, the flow state in the oil wellbore can be quickly analyzed and classified on site, the oil production rate can be improved, and "one well, one method, one process" can be achieved, continuously improving the level of single well management.

Claims

1. An automatic monitoring system for fluid mineralization for refined management of oil wells, characterized by: include, A first three-way valve (1) comprises a first inlet, a second outlet and a third outlet, the first inlet being connected to an oil wellhead pipeline via a pipeline for collecting fluid from the wellhead, and the second outlet being connected to an external device; A flow meter (2), connected to the pipeline between the first inlet and the wellhead pipeline of the oil well, for detecting the real-time water content of the crude oil; a stationary container (3), the top inlet of which is connected to the third outlet via a pipeline; A second three-way valve (4), comprising a second inlet, a fourth outlet and a fifth outlet, wherein the second inlet is connected to the bottom outlet of the static container (3), and the fourth outlet is connected to the external casing; A mineralization detector (5), one end of which is connected to the fifth inlet of the second three-way valve (4), and the other end of which is connected to the external casing; The controller (6) is respectively connected to the first three-way valve (1), the flow meter (2), the second three-way valve (4) and the mineralization detector (5) via electrical signals.

2. The automatic monitoring system for fluid mineralization of oil well refined management according to claim 1 is characterized by: A pressure-reducing regulating valve (7) is also connected to the pipeline between the static container (3) and the first three-way valve (1).

3. The automatic monitoring system for fluid mineralization of oil well refined management according to claim 1 is characterized by: It also includes a monitoring device (8), which is used to monitor the oil-water boundary line in the static container (3), and the monitoring device (8) is connected to the controller (6) via an electrical signal.

4. The automatic monitoring system for fluid mineralization of oil well refined management according to claim 1 or 3, characterized in that: The static container (3) is also marked with a lower water level line.

5. An automatic monitoring method for fluid mineralization for refined management of oil wells, characterized by: Using the oil well flow mineralization automatic detection system as described in any one of claims 1 to 4, Water content detection: opening the first three-way valve (1), the wellhead liquid of the oil well wellhead pipeline is discharged from the third outlet, during which the flow meter (2) performs real-time detection of the water content of the wellhead liquid; For sampling and testing of the mineralization, the third outlet of the first three-way valve (1) is opened, and the liquid from the wellhead enters the static container (3) through the pressure-reducing regulating valve (7), and the oil and water in the crude oil from the wellhead are naturally separated. The fifth outlet of the second three-way valve (4) is opened, and the separated water is discharged into the casing after being tested by the mineralization detector (5). After the mineralization test is completed, the fifth outlet is closed, and the fourth outlet is opened to completely drain the static container (3); The flow pattern change of crude oil during the lifting process from the bottom to the surface is obtained according to the water content, and the influence of oil and gas slippage during the lifting process of oil, gas and water mixture in the wellbore is analyzed, and at the same time, the effect of water injection and oil recovery is analyzed to see water or not. Based on the results of mineralization sampling and testing, it is determined whether the source of produced water is injected water or formation water.

6. The method for automatic monitoring of fluid mineralization for refined management of oil wells according to claim 5, characterized in that: According to the water content test results and the salinity sampling test analysis results, the gas content, crude oil emulsification stability, slip effect speed, water seepage and water seepage source data are obtained, and the oil wells are divided into: Class A stable wells with no water flooding effect have little gas content. There is almost no oil and gas slippage during the lifting process of crude oil from the bottom of the well to the ground. The water content fluctuates within a small range of 5% to 10%, without large fluctuations, which is suitable for continuous oil production without interruption; Class B is a regular light slip well with no water. The water content changes regularly in two intervals, one with low water content and the other with high water content. It changes 1-2 times a day and is suitable for staged intermittent pumping to control the start and stop time of the well and gradually reduce the frequency of changes. Class C wells with no water slippage are characterized by irregular and frequent changes in water content within two intervals: one with water content and one with high water content, with more than 10 changes per day. They are suitable for staged intermittent pumping control to gradually reduce the frequency of changes. They are suitable for intermittent pumping control and adjusting the start and stop time of wells to gradually reduce the frequency of changes. Class D water-seeking and flooded wells and slug flow wells: the instantaneous water cut of water-seeking and flooded wells fluctuates back and forth between 100% and a certain water-cutting section in real time, and the connectivity test of the injection wells blocks the seepage layer; the water cut of slug flow wells is at 0% for a period of time, and then continues for a period of time again in a certain water-cutting section, changing back and forth, and the oil pump is overhauled or the well is shut down for a long time.

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