Plug treatment method, device, equipment, medium and program product for profile control

Abstract

The application provides a segment plug processing method, device, equipment, medium and program product for profile control, and relates to the technical field of profile control in oil exploitation. The method comprises the following steps: segmenting a one-third depth of an oil-water well spacing of a target area to obtain N unit segment plugs; querying a matching coefficient table of polymer gel and an oil reservoir based on a permeability of a water flow dominant channel of the target area to obtain upper and lower limits of a matching coefficient of the polymer gel and the oil reservoir, and establishing a matching coefficient curve formula according to the upper and lower limits of the matching coefficient; obtaining the matching coefficient of each unit segment plug; obtaining the strength of polymer gel of each unit segment plug; querying a concentration and strength table of the polymer gel to obtain the concentration assignment of the polymer gel of each unit segment plug; grouping the unit segment plugs with the same concentration of the polymer gel into one injection segment plug, and calculating the injection amount of each injection segment plug.

Description

Technical Field

[0001] This application relates to the field of profile control technology in oil extraction, and particularly to a slug treatment method, apparatus, equipment, medium, and program product for profile control. Background Technology

[0002] With the continuous development of oil extraction technology, profile control technology has received increasing attention. Heterogeneous reservoirs are prone to forming water flow dominance channels during water drive development, resulting in inefficient or ineffective water circulation. Profile control technology blocks the dominance channels by injecting profile control agents from water wells, adjusts the seepage field of the original water drive reservoir, thereby expanding the sweep system of subsequent water injection and achieving the effect of stabilizing oil and reducing water. The key to achieving this goal is the design of profile control slugs.

[0003] In the relevant profile control slug structure design scheme, designers divide slugs into different types and then perform multi-level composite, or divide the treatment depth into different depths and match slugs of different strengths to achieve profile control technology, block the dominant water flow channels, and then allow subsequent injected water to enter other layers to tap the remaining oil potential.

[0004] However, the relevant design technologies may not be able to objectively and accurately match the strength and pressure field of the profile control system, reducing the accuracy of profile control slug design and thus affecting the efficiency of oil extraction. Summary of the Invention

[0005] This application provides a method, apparatus, device, medium, and program product for slug profile control, which can improve the efficiency of slug processing. The technical solution is as follows:

[0006] In one aspect, a method for profile control slug processing is provided, the method comprising:

[0007] Divide the target area into segments at one-third the depth of the oil-water well distance, and obtain N unit slugs, where N is an integer greater than or equal to 1;

[0008] Based on the permeability of the dominant water flow channels in the target area, the matching coefficient table between the polymer gel and the reservoir is consulted to obtain the upper and lower limits of the matching coefficient between the polymer gel and the reservoir. A matching coefficient curve formula is established based on the upper and lower limits of the matching coefficient. The matching coefficient curve formula is used to represent the relationship between depth and the matching coefficient.

[0009] According to the matching coefficient curve formula, the matching coefficient of each unit block is obtained;

[0010] The strength of the polymer gel of each unit slug is obtained based on the matching coefficient of each unit slug and the permeability of the dominant water flow channel.

[0011] Query the concentration and strength table of the polymer gel to obtain the concentration value of the polymer gel for each unit segment;

[0012] Unit slugs with the same concentration of the polymer gel are grouped into one injection slug, and the injection volume of each injection slug is calculated.

[0013] On the other hand, a slug processing apparatus for profile control is provided, the apparatus comprising:

[0014] The unit slug segmentation module is used to segment the target area at a depth of one-third of the distance between oil and water wells to obtain N unit slugs, where N is an integer greater than or equal to 1.

[0015] The matching coefficient curve formula establishment module is used to query the polymer gel and reservoir matching coefficient table, obtain the upper and lower limits of the matching coefficient between the polymer gel and the reservoir, and establish the matching coefficient curve formula.

[0016] The polymer gel and reservoir matching coefficient acquisition module is used to query the polymer gel and reservoir matching coefficient table based on the permeability of the water flow dominant channel in the target area, obtain the upper and lower limits of the matching coefficient between the polymer gel and the reservoir, and establish a matching coefficient curve formula based on the upper and lower limits of the matching coefficient. The matching coefficient curve formula is used to represent the relationship between depth and the matching coefficient.

[0017] A polymer gel strength acquisition module is used to acquire the strength of the polymer gel of each unit slug based on the matching coefficient of each unit slug and the permeability of the dominant water flow channel.

[0018] The polymer gel concentration acquisition module is used to query the concentration and strength table of the polymer gel and obtain the concentration value of the polymer gel for each unit segment.

[0019] An injection slug module is used to group unit slugs with the same concentration of the polymer gel into one injection slug and to calculate the injection volume of each injection slug.

[0020] In some embodiments, the matching coefficient curve formula establishment module is used for,

[0021] The upper limit of the matching coefficient is used as the matching coefficient corresponding to the end value of the depth range of the first unit slug; the first unit slug is the deepest unit slug among the N unit slugs;

[0022] The lower limit of the matching coefficient is used as the matching coefficient corresponding to the end value of the depth range of the second unit slug; the second unit slug is the shallowest unit slug among the N unit slugs;

[0023] The parameters of the logarithmic function are calculated based on the upper limit of the matching coefficient, the end value of the depth range of the first unit slug, the lower limit of the matching coefficient, and the end value of the depth range of the second unit slug, to obtain the matching coefficient curve formula.

[0024] In some embodiments, the polymer gel strength acquisition module is used for,

[0025] Obtain the end value of the depth range for each of the aforementioned unit slugs;

[0026] Substitute the end value of the depth range of each unit slug into the matching coefficient curve formula to obtain the matching coefficient corresponding to each unit slug.

[0027] In some embodiments, the polymer gel concentration acquisition module is used for,

[0028] Query the strength range of the polymer gel corresponding to the unit plug;

[0029] By consulting the concentration and strength table of the polymer gel, the concentration range of the polymer gel corresponding to the strength range of the unit slug can be obtained;

[0030] The upper limit of the concentration range of the unit slug is used as the concentration of the polymer gel used in the unit slug.

[0031] The polymer gel concentration acquisition module also includes a polymer gel concentration and strength table acquisition submodule, which is used to obtain the polymer gel concentration and strength table based on pressure field experimental measurements.

[0032] In some embodiments, the injection slug module is used for,

[0033] The injection volume of each unit slug is calculated;

[0034] The injection volume of the injected segment is obtained by adding the injection volumes of each unit segment with the same polymer gel concentration.

[0035] In another aspect, a computer device is provided, the computer device including a processor and a memory, the memory storing at least one computer program, the at least one computer program being loaded and executed by the processor to implement the above-described segment processing method for profile adjustment.

[0036] In another aspect, a computer-readable storage medium is provided, wherein at least one computer program is stored in the computer program, which is loaded and executed by a processor to implement the above-described slug processing method for profile adjustment.

[0037] In another aspect, a computer program product is provided, comprising a computer program stored in a computer-readable storage medium. A processor of a computer device reads the computer program from the computer-readable storage medium and executes the computer program, causing the computer device to perform the segmentation processing method for profile control described in the various alternative implementations above.

[0038] The technical solutions provided in this application embodiment may have the following beneficial effects:

[0039] When designing profile control slugs using polymer gels, the objective factor of the pressure field is fully considered. A matching coefficient curve formula is established to ensure that the change in the matching coefficient is smaller than the change in the pressure field. This makes the designed polymer gel slugs more closely matched to the reservoir pressure field, effectively avoiding human influence and ensuring the objectivity of the slug design. This results in more reasonable and accurate slug designs. Furthermore, the corresponding analysis and calculations are mature, simple, and easy to implement using computers, achieving the quantification of polymer gel slug design. Through the development of supporting software, the design of polymer gel slugs can be software-based, providing a foundation for future intelligent profile control. On the other hand, based on the above, using different concentrations of polymer gel for different slug designs also reduces design costs. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of an implementation environment provided by an exemplary embodiment of this application;

[0041] Figure 2 This is a flowchart of a segment plug processing method for profile adjustment provided in one embodiment of this application;

[0042] Figure 3 This is a schematic diagram of the pressure field versus polymer gel strength in a water injection well according to one embodiment of this application;

[0043] Figure 4 This is a flowchart of a segment plug processing method for profile adjustment provided in one embodiment of this application;

[0044] Figure 5 This is a flowchart of a segment plug processing method for profile adjustment provided in one embodiment of this application;

[0045] Figure 6 This is a block diagram of a slug processing apparatus for profile adjustment provided in one embodiment of this application;

[0046] Figure 7 This is a structural block diagram of a computer device provided in one embodiment of this application. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0048] 1) Profile Control: The profile control technology involved in this application belongs to the field of oil extraction. Profile control refers to the operation of sealing high-permeability layers from water injection wells, which can adjust the water absorption profile of the water injection zone. Oil profile control refers to improving the productivity of oil wells and reducing the interaction between oil and water in oil wells by injecting specific chemicals or polymers into the oil field, thereby increasing the recovery rate of crude oil.

[0049] 2) Slug: A slug is a blockage formed when an oil-displacing agent is injected into an oil reservoir, creating a distinct oil displacement zone that is subsequently displaced by another oil-displacing agent. The primary function of a slug is to control the flow of underground fluids, typically to isolate groundwater sources or control fluids within the well to maximize oil and gas recovery efficiency. They can also be used to prevent contaminant migration and maintain wellbore stability. In profile control or downhole engineering, operators can inject specific sealing materials to create slug structures.

[0050] 3) Profile control agents: Chemical substances used in petroleum engineering to adjust the intake profile of water-injected formations, thereby improving oil well recovery and production capacity. These chemicals are commonly used in oilfield profile control to reduce interfacial tension between crude oil and groundwater, improve crude oil flowability, and thus increase oil production efficiency.

[0051] 4) Polymer gel: A special type of material with a three-dimensional network structure that can contain a large amount of liquid. This material usually exhibits semi-solid or semi-liquid properties, with the ability to adsorb water molecules, tunability and stability.

[0052] Figure 1 A schematic diagram of an implementation environment provided by an exemplary embodiment of this application is shown. This implementation environment may include: a computer-aided design software tool 110 and an oil profile control sluice management system 120.

[0053] The aforementioned oil profile control slug management system 120 can be an independent oil profile control slug management system, or a cluster or distributed system composed of multiple oil profile control slug management systems. The computer-aided design software tool 110 can be a software tool for computer-aided control of manufacturing equipment, assisting in engineering analysis and simulation, assisting in the management of visualized geospatial data, and used for oil profile control slug design and oil profile control slug information management.

[0054] The computer-aided design software tool 110 and the oil profile control slug management system 120 can be on the same terminal device or on different terminal devices. When on different terminal devices, the computer-aided design software tool 110 and the oil profile control slug management system 120 can interact wirelessly. This application does not impose any limitations on this.

[0055] Figure 1 Only one computer-aided design software tool is shown in the figure, but in different embodiments there are multiple other computer-aided design software tools that can be connected to the profile control system 120.

[0056] Please refer to Figure 2 It illustrates a flowchart of a slug processing procedure for profile adjustment according to an embodiment of this application. This method can be executed by a computer device, for example, by a computer device running software tools, which may be... Figure 1 The computer-aided design software tool 110 in the implementation environment, such as Figure 2 As shown, the method may include the following steps:

[0057] Step 201: Divide the target area into segments at one-third the depth of the oil-water well distance, and obtain N unit slugs, where N is an integer greater than or equal to 1.

[0058] In this embodiment of the application, the distance between the water injection well and the oil production well can be obtained, and one-third of this distance can be taken as the depth of the profile control treatment. This depth is divided into N unit slugs, and each unit slug corresponds to a depth range.

[0059] Step 202: Query the matching coefficient table between polymer gel and reservoir, obtain the upper and lower limits of the matching coefficient between polymer gel and reservoir, and establish the matching coefficient curve formula.

[0060] In this embodiment of the application, the upper and lower limits of the matching coefficient between polymer gel and reservoir can be obtained by querying the table of matching coefficients between polymer gel and reservoir through the permeability of the dominant water flow channel, and a matching coefficient curve formula can be established based on the upper and lower limits of the matching coefficient between polymer gel and reservoir.

[0061] The aforementioned water flow dominant channel permeability refers to the permeability associated with water flow channels in the oil-water layer of an underground reservoir. Water flow dominant channels typically have higher permeability relative to other parts of the reservoir, allowing water or other fluids to flow more easily. The permeability of these water flow dominant channels can be measured downhole by logging tools, detected by groundwater monitoring wells, or tested in a laboratory after core samples are collected by staff.

[0062] In this embodiment, the strength of the corresponding polymer gel can be found based on the concentration of the polymer gel, and the upper and lower limits of the matching coefficient between the polymer gel and the reservoir can be calculated by combining the permeability. The upper limit of the matching coefficient between the polymer gel and the reservoir is the end value of the depth range corresponding to the first unit slug, and the lower limit of the matching coefficient between the polymer gel and the reservoir is the end value of the depth range corresponding to the last unit slug.

[0063] Table 1. Matching coefficients between polymer gels and reservoirs

[0064]

[0065] The profile control system involved in this application is a polymer gel system adapted to reservoir temperature and salinity; the basic data involved include: well spacing L (unit: meters), profile control depth Rt; permeability K of the water flow dominant channel, layer thickness h of the water flow dominant channel, porosity Φ, and fluid sweep efficiency ρ.

[0066] The matching coefficient λ is the matching coefficient between the polymer gel and the reservoir, and the formula for calculating this coefficient is shown in formula (1):

[0067] λ=σ / k(1)

[0068] The matching coefficients mentioned above are dimensionless numbers, representing the degree of matching between the polymer gel and the substrate at a certain permeability. The matching coefficients are related not only to the permeability of the treated layer but also to the strength of the polymer gel. Here, σ represents the gel strength, which is the strength of the polymer gel after curing under reservoir conditions for a certain period, measured in mPa·s; k represents the permeability of the high-permeability absorbent layer, measured in mD.

[0069] For example, if the current concentration of the polymer gel is 0.2%, the strength of the polymer gel is 4500, and the permeability of the dominant water flow channel is 1000, then the matching coefficient between this polymer gel and the reservoir is 4.5.

[0070] The matching coefficient exists in an interval [λ]. min , λ max ], λ min The minimum matching coefficient refers to the situation where, under certain permeability conditions, a polymer gel solution of a certain concentration is injected into a sand-filled pipe, cured for 30 days at reservoir temperature, and then waterflooding is performed. If the waterflooding breakthrough pressure is twice the highest pressure during gel solution injection, it indicates that the high-permeability layer has been partially sealed. λ min The strength of the intermediate gel is the gel strength obtained by curing the laboratory-prepared gel solution at this concentration for a certain period of time at reservoir temperature. λ max This is the maximum value of the matching coefficient, generally referring to the point at which, under this permeability, after injecting a certain concentration of polymer gel, the high-permeability layer is completely sealed, preventing further injection and resulting in infinite injection pressure. λmax The strength of the intermediate gel is the gel strength of the gel solution prepared indoors and cured at the reservoir temperature for a certain period of time at this concentration.

[0071] Formula (2) is a logarithmic function used to calculate the matching coefficient of the processing depth of each unit slug. Formula (2) is as follows:

[0072] λ=a*ln(x)+b(2)

[0073] Where x is the processing depth of each segment; the values ​​of a and b are determined by the upper and lower limits of the matching coefficient, i.e., the matching coefficient is λ at the end of the first unit slug. max The matching coefficient at the end value of the last unit slug is λ. min Thus, the values ​​of a and b can be calculated.

[0074] The upper limit of the matching coefficient is taken as the matching coefficient corresponding to the end value of the depth range of the first unit slug; the first unit slug is the deepest unit slug among the N unit slugs;

[0075] The lower limit of the matching coefficient is taken as the matching coefficient corresponding to the end value of the depth range of the second unit slug; the second unit slug is the shallowest unit slug among the N unit slugs.

[0076] Based on the upper limit of the matching coefficient, the end value of the depth range of the first unit slug, the lower limit of the matching coefficient, and the end value of the depth range of the second unit slug, a system of two linear equations in two variables is established, the parameters of the logarithmic function are calculated, and the matching coefficient curve formula is obtained.

[0077] For example, the processing depth of the first unit slug is 0-5m, and the end value of the depth range of the first unit slug is x = 5, λ = λ. max =28; The treatment depth of the last unit slug is 95-100m, and the end value of the depth range of the second unit slug is x=100, λ=λ min =4.5, substitute into formula (2), calculate the coefficients a and b, obtain the values ​​of a and b, and generate the formula as shown in formula (3):

[0078] λ=-7.847*ln(x)+40.599(3)

[0079] Before the above steps, we need to obtain a table of polymer gel concentration and strength based on pressure field experiments. This data can be obtained through laboratory experiments. Take a fixed amount of polymer gel, dry it in an oven, measure the polymer gel concentration at this point using a viscometer, and then measure the strength of the polymer gel at that concentration. Compile the measurement data into Table 2 as shown below.

[0080] Table 2 Polymer Gel Concentration and Strength

[0081] Polymer concentration (%) <![CDATA[C1]]> <![CDATA[C2]]> ... Cn Strength of polymer gel (mPa·s) <![CDATA[σ1]]> <![CDATA[σ2]]> ... <![CDATA[σ n ]]>

[0082] Note: The strength of polymer gel refers to the gel strength after curing at reservoir temperature for a certain period of time. C1 is the lowest concentration at which this type of polymer gel can gel under reservoir conditions.

[0083] The parameters for the above polymer gel concentration and strength table are not limited to the measurement methods described above; this is merely an illustrative example.

[0084] In this scheme, it is necessary to ensure that the numerical changes are consistent with the changes in the reservoir pressure field, and to ensure that the numerical changes in the matching coefficient are smaller than the changes in the pressure field, so as to ensure effective sealing of the reservoir at various depths.

[0085] Please refer to Figure 3 It shows a schematic diagram of the pressure field versus polymer gel strength in a water injection well. For example... Figure 3 As shown:

[0086] Curve A 301 represents the reservoir pressure curve, while curves a 302, b 304, and c 303 represent the strength curves of polymer gels at different concentrations. Among them, the polymer gel c represented by curve c 303 has the lowest strength, while the polymer gel b represented by curve b 304 has the highest strength. The variation range of curve a 302 is consistent with that of curve A 301, indicating that the strength of polymer gel a represented by curve a 302 is just right to effectively seal the reservoir at this depth.

[0087] When the pressure is low near the water well, the pressure decreases as the well distance increases. The change in the matching coefficient of polymer gel a 302 is consistent with the change in the pressure field. At this point, polymer gel a is just filling the gap. The change in curve 304b is smaller than the change in the pressure field, which means that the strength of polymer gel b is greater than the strength of polymer gel a, which is greater than the strength of the pressure field. The polymer gel strength is greater than the pressure field strength, which allows for better filling and more effective sealing.

[0088] Step 203: Obtain the matching coefficient between the polymer gel and the reservoir for each unit slug according to the matching coefficient curve formula.

[0089] Obtain the end value of the depth range for each unit slug.

[0090] Substitute the end value of the depth range of each unit slug into the matching coefficient curve formula to obtain the matching coefficient corresponding to each unit slug.

[0091] When obtaining the matching coefficient between the polymer gel and the reservoir for each unit slug, the end value of the depth range of each unit slug can be obtained, and the end value of the depth range of each unit slug can be substituted into the matching coefficient curve formula to obtain the matching coefficient corresponding to each unit slug.

[0092] For example, based on the formula (3) obtained in step 202 above, a unit slug with a processing depth range of 10-15 meters between 0-100m is selected, and the last value of the depth range of the unit slug, 15, is substituted into formula (3) to obtain a matching coefficient of 19.349.

[0093] Step 204: Obtain the strength of the polymer gel for each unit slug based on the matching coefficient of each unit slug and the permeability of the dominant water flow channel.

[0094] Based on the matching coefficient of each unit slug and the matching coefficient formula, the polymer gel strength of each unit slug is calculated.

[0095] After obtaining the matching coefficient of each unit slug according to step 203 above, and combining it with the permeability of the dominant water flow channel, the polymer gel strength of each unit slug is calculated by substituting it into formula (1).

[0096] For example, if the permeability of the current dominant water flow channel is 1000, and the matching coefficient between this polymer gel and the reservoir is 4.5, then the strength of the polymer gel is 4500.

[0097] Step 205: Query the concentration and strength table of polymer gel to obtain the concentration value of polymer gel for each unit slug.

[0098] Based on the polymer gel concentration and strength table, the corresponding gel strength range was determined, and thus the polymer concentration range was derived. To ensure the reliability of sealing the high-permeability absorbent layer, the upper limit of the concentration range was assigned as the polymer gel concentration for each unit slug.

[0099] Step 206: Group the unit slugs with the same polymer gel concentration into one injection slug and calculate the injection volume of each injection slug.

[0100] The concentration is determined by classification, and those with the same assigned concentration are grouped into one injection slug. The injection volume of the injection slug is calculated based on the number of unit slugs contained in the injection slug.

[0101] In the embodiments of this application, the numerical changes are kept consistent with the changes in the reservoir pressure field, and the numerical changes in the matching coefficients are kept smaller than the changes in the pressure field.

[0102] In this embodiment, a matching coefficient curve formula was established under the premise that the change in the matching coefficient is smaller than the change in the pressure field. This makes the designed polymer gel slug more compatible with the reservoir pressure field, effectively avoids human influence, ensures the objectivity of the slug design, and makes the slug design more reasonable and accurate. On the other hand, based on the above, the design cost is also reduced by using polymer gels of different concentrations for different slug designs.

[0103] based on Figure 2 Please refer to Figure 4 It illustrates a flowchart of a slug processing procedure for profile adjustment according to an embodiment of this application. This method can be executed by a computer device, for example, by a computer device running software tools, which may be... Figure 1 The computer-aided design software tool 110 in the implementation environment, in Figure 4 In the illustrated embodiment, step 205 can be implemented as steps 205a, 205b, and 205c:

[0104] Step 205a: Query the strength range of the polymer gel corresponding to the unit slug.

[0105] The concentration and strength of the polymer gel were obtained based on pressure field experiments.

[0106] A series of experiments were conducted under different pressure conditions to record the pressure applied to the polymer gel and the displacement of the polymer gel. By analyzing the collected data, the strength of the polymer gel can be calculated, and the concentration of the polymer gel can be measured. The measured strength data and concentration data are correlated to establish the relationship between strength and concentration, and a table of polymer gel concentration and strength is produced.

[0107] Because there are many possible values ​​for the strength of a polymer gel, the two values ​​closest to the current strength are found in the polymer gel concentration and strength table. One value is greater than the current strength, and the other is less than the current strength. This value represents the strength range of the polymer gel.

[0108] Step 205b: Query the concentration and strength table of polymer gels to obtain the concentration range of the corresponding polymer gel for each unit slug strength range.

[0109] Step 205c: Use the upper limit of the concentration range of the unit slug as the concentration of the polymer gel used in the unit slug.

[0110] According to Table (2), the strength range of the polymer gel corresponding to the unit slug is obtained. Then, the concentration range of the unit slug is obtained by looking up the corresponding strength range in the table. Finally, the upper limit of the concentration range is taken as the concentration of the polymer gel.

[0111] In this embodiment, the upper limit of the concentration range is selected as the polymer gel concentration value for each unit slug. The higher the polymer gel concentration, the greater the strength. The greater the strength, the more reliable the sealing of the absorbent layer can be, thus making the slug design more effective.

[0112] based on Figure 2 Please refer to Figure 5 It illustrates a flowchart of a slug processing procedure for profile adjustment according to an embodiment of this application. This method can be executed by a computer device, for example, by a computer device running software tools, which may be... Figure 1 The computer-aided design software tool 110 in the implementation environment, in Figure 5 In the illustrated embodiment, step 206 can be implemented as steps 206a and 206b:

[0113] Step 206a: Calculate the injection volume of each unit slug.

[0114] The injection volume per unit slug can be obtained by formula (4), which is as follows:

[0115] m 3 =πr 2 h*ρ (4)

[0116] r represents the radius, h represents the thickness of the dominant channel of the water flow, and ρ represents the sweep efficiency.

[0117] For example, if the depth range of the unit slug is 0-5 meters, let r equal 0 and 5 respectively and substitute them into formula (4). When r is 0, the calculated injection volume is A. When r is 5, the calculated injection volume is B. The absolute value of the difference between B and A is the injection volume of the unit slug.

[0118] Step 206b: Add up the injection amounts of each unit slug with the same polymer gel concentration to obtain the injection amount of the injected slug.

[0119] The concentration is determined by classification. Unit slugs with the same assigned concentration are grouped into one injection slug. The injection volumes of all unit slugs in the same injection slug are added together to obtain the total injection volume required for that injection slug.

[0120] In the embodiments of this application, polymer gels of different concentrations are used for design according to different processing depths, so that the designed slugs fit the different processing depths better and improve the accuracy of slug design. On the other hand, using polymer gels of different concentrations reduces material costs.

[0121] Based on the above Figures 2 to 5 The scheme shown takes the injection well GX-1 as an example, with one injection and one production well, and the distance between the injection and production wells is 300 meters. There is a high-permeability water-absorbing layer in the production layer, with a permeability of 1035 mD, a layer thickness of 3 m, a porosity of 0.31, and a fluid sweep efficiency of 0.25. In order to plug this high-permeability water-absorbing layer, DG-1 type polymer gel profile control is used. The polymer gel matching coefficient with the reservoir is shown in the table. The polymer gel concentration and strength are as follows. The polymer gel slugs are designed for treatment depths of 50 m, 70 m, and 90 m.

[0122] Table 3. Matching coefficients between polymer gels and reservoirs

[0123] Permeability (mD) of dominant water flow channels 400 1000 5000 <![CDATA[Lower limit of matching coefficient (λ min )]]> 11.25 4.5 1.8 <![CDATA[Upper limit of matching coefficient (λ max )]]> 45 28 7.4

[0124] Table 4. Concentration and Strength of DG-1 Type Polymer Gel

[0125]

[0126] Based on the slug design steps, the specific design is as follows:

[0127] (1) Optimal treatment depth segmentation: The distance between oil and water wells is 300 meters, and the optimal treatment depth is set at 1 / 3 of the distance between wells, so the optimal treatment depth is 100m. Divide the optimal treatment depth into 20 segments of 5m each, and calculate the injection volume of each unit slug. Fill in the summary table 5.

[0128] (2) Establish the matching coefficient curve formula: The permeability of the high-permeability layer is 1035 mD, so the matching coefficients are selected from Table 3 when the total permeability is 1000 mD. According to the matching coefficient curve formula generation method, the treatment depth of the first unit slug is 0-5 m, and when x = 5 m, λ = λmax = 28; the treatment depth of the last unit slug is 95-100 m, and when the treatment depth x = 100 m, λ = λmin = 4.5; the coefficients a and b are obtained, and the formula is generated as shown in formula (3).

[0129] (3) Determine the matching coefficient of each unit slug: According to the generated formula, x is substituted into the end value of the processing depth of each unit slug, such as 10, 15, 20 to 95, to calculate the matching coefficient of the remaining slugs, and then the data is filled into summary table 5.

[0130] (4) Determine the polymer gel strength corresponding to each unit slug: Based on the matching coefficient of each unit slug and the matching coefficient formula, calculate the polymer gel strength of each unit slug, and then fill the data into summary table 5.

[0131] (5) Assignment of polymer gel concentration for each unit slug: Based on Table 4 of polymer gel concentration and strength, find the corresponding gel strength range, and then obtain the polymer concentration range. To ensure the reliability of sealing the high-permeability absorbent layer, the upper limit of the concentration range is used as the polymer gel concentration assignment for each unit slug.

[0132] (6) Determine the concentration and injection volume of each injection slug: The concentration is determined by classification method. Slugs with the same assigned concentration are grouped into one injection slug. The injection volume of the injection slug is calculated based on the number of unit slugs contained in the injection slug.

[0133] ①Concentration and injection volume of each injection slug at a treatment depth of 50m: The unit slug is cut off at 50m. The concentrations of each unit slug before that are classified into two categories: 0.5% and 0.4%. These two different concentrations are the two injection slugs. Then the injection volume of each injection slug is calculated and filled into summary table 5.

[0134] ② Determine the concentration and injection volume of each injection slug at a treatment depth of 70m: The unit slug ends at 70m. The concentrations of the previous unit slugs are classified into three categories: 0.5%, 0.4%, and 0.3%. These three different concentrations are the three injection slugs. Then calculate the injection volume of each injection slug and fill it into summary table 5.

[0135] ③ Determine the concentration and injection volume of each injection slug at a treatment depth of 90m: The unit slug ends at 90m. The concentrations of the previous unit slugs are classified into three categories: 0.5%, 0.4%, and 0.3%. These three different concentrations are the three injection slugs. Then, calculate the injection volume of each injection slug and fill it into summary table 5.

[0136] Table 5 Summary of Polymer Gel Profile Modification Slug Design in Well GX-1

[0137]

[0138]

[0139] The polymer gel slug design for profile control in injection well GX-1 is as follows:

[0140] 1) When the treatment depth is 50m, it is divided into 2 slugs: the first slug has a polymer gel concentration of 0.4% and an injection volume of 1661m³. 3 The second stage of the plug had a polymer gel concentration of 0.5% and an injection volume of 164 mg / L. 3 ;

[0141] 2) When the treatment depth is 70m, it is divided into 3 slugs: the first slug has a polymer gel concentration of 0.3% and an injection volume of 1369m³. 3 The second stage of the plug had a polymer gel concentration of 0.4% and an injection volume of 2044 mg / L. 3 The third stage of the plug had a polymer gel concentration of 0.5% and an injection volume of 164 mg / L. 3 ;

[0142] 3) When the treatment depth is 90m, it is divided into 3 slugs: the first slug has a polymer gel concentration of 0.3% and an injection volume of 3705m³. 3 The second stage of the plug had a polymer gel concentration of 0.4% and an injection volume of 2044 mg / L. 3 The third stage of the plug had a polymer gel concentration of 0.5% and an injection volume of 164 mg / L. 3 .

[0143] The following are embodiments of the apparatus described in this application, which can be used to execute the embodiments of the method described in this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the method described in this application.

[0144] Please refer to Figure 6 It shows a block diagram of a slug design device utilizing polymer gel profiling according to an embodiment of this application, such as Figure 6 As shown, the device may include the following modules:

[0145] The unit slug segmentation module 601 is used to segment the target area at one-third depth of the oil-water well distance to obtain N unit slugs, where N is an integer greater than or equal to 1.

[0146] The matching coefficient curve formula establishment module 602 is used to query the matching coefficient table between polymer gel and reservoir, obtain the upper and lower limits of the matching coefficient between polymer gel and reservoir, and establish the matching coefficient curve formula.

[0147] The polymer gel and reservoir matching coefficient acquisition module 603 is used to query the polymer gel and reservoir matching coefficient table based on the permeability of the water flow dominant channel in the target area, obtain the upper and lower limits of the matching coefficient between the polymer gel and the reservoir, and establish a matching coefficient curve formula based on the upper and lower limits of the matching coefficient. The matching coefficient curve formula is used to represent the relationship between depth and matching coefficient.

[0148] The polymer gel strength acquisition module 604 is used to acquire the strength of the polymer gel of each unit slug based on the matching coefficient of each unit slug and the permeability of the dominant water flow channel.

[0149] The polymer gel concentration acquisition module 605 is used to query the polymer gel concentration and strength table and obtain the polymer gel concentration value for each unit slug.

[0150] The injection slug module 606 is used to group unit slugs with the same polymer gel concentration into one injection slug and calculate the injection volume of each injection slug.

[0151] In some embodiments, the matching coefficient curve formula establishment module 602 is used for,

[0152] The upper limit of the matching coefficient is taken as the matching coefficient corresponding to the end value of the depth range of the first unit slug; the first unit slug is the deepest unit slug among the N unit slugs;

[0153] The lower limit of the matching coefficient is taken as the matching coefficient corresponding to the end value of the depth range of the second unit slug; the second unit slug is the shallowest unit slug among the N unit slugs.

[0154] Based on the upper limit of the matching coefficient, the end value of the depth range of the first unit slug, the lower limit of the matching coefficient, and the end value of the depth range of the second unit slug, the parameters of the logarithmic function are calculated to obtain the matching coefficient curve formula.

[0155] In some embodiments, the polymer gel strength acquisition module 604 is used for,

[0156] Obtain the final value of the depth of each unit slug;

[0157] Also used for,

[0158] Obtain the end value of the depth range for each unit slug;

[0159] Substitute the end value of the depth range of each unit slug into the matching coefficient curve formula to obtain the matching coefficient corresponding to each unit slug.

[0160] In some embodiments, the polymer gel concentration acquisition module 605 is used for,

[0161] Find the strength range of the polymer gel corresponding to the unit slug;

[0162] Consult the polymer gel concentration and strength table to obtain the corresponding polymer gel concentration range for each unit slug strength range.

[0163] The upper limit of the concentration range of a unit slug is used as the concentration of the polymer gel used per unit slug.

[0164] The polymer gel concentration acquisition module also includes a polymer gel concentration and strength table acquisition submodule, which is used to obtain the polymer gel concentration and strength table based on pressure field experimental measurements.

[0165] In some embodiments, the injection slug module 606 is used for,

[0166] The injection volume of each unit slug was calculated;

[0167] The injection volume of each unit slug with the same polymer gel concentration is obtained by adding the injection volumes of the injected slugs.

[0168] Figure 7 This illustration shows a structural block diagram of a computer device 700 provided in an exemplary embodiment of this application. Examples include personal computers, smartphones, and tablet computers. The computer device 700 may also be referred to by other names such as user equipment.

[0169] Typically, computer device 700 includes a processor 701 and a memory 702.

[0170] The memory 702 may include one or more computer-readable storage media, which may be tangible and non-transitory. The memory 702 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices. In some embodiments, the non-transitory computer-readable storage media in the memory 702 is used to store at least one instruction, which is executed by the processor 701 to implement all or part of the steps performed by the computer-aided design software tool in the methods provided in the embodiments of this application.

[0171] In some embodiments, the computer device 700 may also optionally include: a peripheral device interface 703 and at least one peripheral device. Specifically, the peripheral device includes at least one of: a radio frequency circuit 704, a touch display screen 705, a camera 706, an audio circuit 707, and a power supply 708.

[0172] In some embodiments, the computer device 700 further includes one or more sensors 709. The one or more sensors 709 include, but are not limited to, an accelerometer 710, a gyroscope 711, a pressure sensor 712, an optical sensor 713, and a proximity sensor 714.

[0173] Those skilled in the art will understand that the structure shown above does not constitute a limitation on the computer device 700, and may include more or fewer components than shown, or combine certain components, or employ different component arrangements.

[0174] In one exemplary embodiment, a computer-readable storage medium is also provided for storing at least one computer program, which is loaded and executed by a processor to implement all or part of the steps in the methods shown in the various embodiments above. For example, the computer-readable storage medium may be a read-only memory, a random access memory, a read-only optical disk, a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0175] In one exemplary embodiment, a computer program product is also provided, comprising a computer program stored in a computer-readable storage medium. A processor of a computer device reads the computer program from the computer-readable storage medium and executes the computer program, causing the computer device to perform all or part of the steps in the methods shown in the various embodiments above.

[0176] Before and during the collection of user data, this application can display a prompt interface, pop-up window, or output voice prompt information. This prompt interface, pop-up window, or voice prompt information is used to inform the user that their relevant data is being collected. This ensures that the application only begins to execute the relevant steps of collecting user data after obtaining confirmation from the user regarding the prompt interface or pop-up window. Otherwise (i.e., if no confirmation is obtained from the user regarding the prompt interface or pop-up window), the relevant steps of collecting user data are terminated, and the user's relevant data is not collected.

[0177] In other words, all user data collected in this application is collected with the user's consent and authorization, and the collection, use and processing of relevant user data must comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0178] The aforementioned user data includes information (including but not limited to user accounts), data (including but not limited to user-inputted text data, stored text / image data, displayed text / image data, etc.), and signal data. For example, the user data involved in this application was obtained with full authorization.

[0179] It should be understood that "multiple" as used in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0180] The above description is merely an exemplary embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for processing slugs for profile control, characterized in that, The method includes: Divide the target area into segments at one-third the depth of the oil-water well distance, and obtain N unit slugs, where N is an integer greater than or equal to 1; Based on the permeability of the dominant water flow channels in the target area, a matching coefficient table for polymer gel and reservoir is consulted to obtain the upper and lower limits of the matching coefficient. A matching coefficient curve formula is then established based on these limits. The matching coefficient is calculated using Formula 1, as follows: ， in, It is the matching coefficient. It is gel strength. It is the permeability of the dominant water flow channel. The matching coefficient curve formula is a logarithmic function of the matching coefficient with the depth value as the input parameter. The matching coefficient curve formula is used to represent the relationship between depth and the matching coefficient. According to the matching coefficient curve formula, the matching coefficient of each unit block is obtained; The strength of the polymer gel of each unit slug is obtained based on the matching coefficient of each unit slug and the permeability of the dominant water flow channel. Query the concentration and strength table of the polymer gel to obtain the concentration value of the polymer gel for each unit segment; Unit slugs with the same concentration of the polymer gel are grouped into one injection slug, and the injection volume of each injection slug is calculated.

2. The method according to claim 1, characterized in that, The step of establishing the matching coefficient curve formula based on the upper and lower limits of the matching coefficient includes: The upper limit of the matching coefficient is used as the matching coefficient corresponding to the end value of the depth range of the first unit slug; the first unit slug is the deepest unit slug among the N unit slugs; The lower limit of the matching coefficient is used as the matching coefficient corresponding to the end value of the depth range of the second unit slug; the second unit slug is the shallowest unit slug among the N unit slugs; The parameters of the logarithmic function are calculated based on the upper limit of the matching coefficient, the end value of the depth range of the first unit slug, the lower limit of the matching coefficient, and the end value of the depth range of the second unit slug, to obtain the matching coefficient curve formula.

3. The method according to claim 1, characterized in that, According to the matching coefficient curve formula, the matching coefficient between the polymer gel and the reservoir for each unit slug is obtained, including: Obtain the end value of the depth range for each of the aforementioned unit slugs; Substitute the end value of the depth range of each unit slug into the matching coefficient curve formula to obtain the matching coefficient corresponding to each unit slug.

4. The method according to claim 1, characterized in that, Before querying the concentration and strength table of the polymer gel to obtain the concentration value of the polymer gel for each unit segment, the method further includes: The concentration and strength of the polymer gel were obtained based on pressure field experiments.

5. The method according to claim 4, characterized in that, The method includes: Query the strength range of the polymer gel corresponding to the unit plug; By consulting the concentration and strength table of the polymer gel, the concentration range of the polymer gel corresponding to the strength range of the unit slug can be obtained; The upper limit of the concentration range of the unit slug is used as the concentration of the polymer gel used in the unit slug.

6. The method according to claim 1, characterized in that, The method involves grouping unit slugs with the same concentration of the polymer gel into one injection slug, and calculating the injection volume of each injection slug. The injection volume of each unit slug is calculated; The injection volume of the injected segment is obtained by adding the injection volumes of each unit segment with the same polymer gel concentration.

7. A slug processing device for profile control, characterized in that, The device includes: The unit slug segmentation module is used to segment the well at one-third of the distance between the oil and water wells to obtain N unit slugs, where N is an integer greater than or equal to 1. The matching coefficient curve formula establishment module is used to query the matching coefficient table between polymer gel and reservoir, obtain the upper and lower limits of the matching coefficient between polymer gel and reservoir, and establish the matching coefficient curve formula. The matching coefficient is calculated using Formula 1, as follows: ， in, It is the matching coefficient. It is gel strength. It is the permeability of the dominant water flow channel. The matching coefficient curve formula is a logarithmic function of the matching coefficient with the depth value as the input parameter. The matching coefficient curve formula is used to represent the relationship between depth and the matching coefficient. The matching coefficient acquisition module is used to acquire the matching coefficient of each unit block according to the matching coefficient curve formula; A polymer gel strength acquisition module is used to acquire the strength of the polymer gel of each unit slug based on the matching coefficient of each unit slug and the permeability of the dominant water flow channel. The polymer gel concentration acquisition module is used to query the concentration and strength table of the polymer gel and obtain the concentration value of the polymer gel for each unit segment. The injection slug module groups unit slugs with the same concentration of polymer gel into one injection slug and calculates the injection volume of each injection slug.

8. A computer device, characterized in that, The computer device includes a processor and a memory, the memory storing at least one computer program, which is loaded and executed by the processor to implement the slug processing method for profile control as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one computer program, which is loaded and executed by a processor to implement the slug processing method for profile control as described in any one of claims 1 to 6.

10. A computer program product, characterized in that, The computer program product includes computer instructions stored in a computer-readable storage medium; the computer instructions are read and executed by a processor of a computer device to implement the slug processing method for profile control as described in any one of claims 1 to 6.

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