Plugging processing method, device and equipment for profile control, medium and program product

Abstract

The invention provides a slug treatment method, device and equipment for profile control, a medium and a program product, and relates to the technical field of profile control in oil exploitation. The method comprises the following steps: segmenting one third depth of an oil-water well distance in a target area to obtain N unit slugs; querying a matching coefficient table of the polymer gel and the oil reservoir based on the water flow dominant channel permeability of the target area, obtaining 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; the matching coefficient of each unit slug is obtained; obtaining the strength of the polymer gel of each unit slug; querying a concentration and intensity table of the polymer gel, and obtaining the concentration assignment of the polymer gel of each unit slug; and classifying the unit slugs with the same concentration of the polymer gel as one injection slug, and calculating the injection amount of each injection slug.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of profile control in oil production, and in particular to a slug processing method, device, equipment, medium and program product for profile control. Background Art

[0002] With the continuous development of oil extraction technology, profile control technology has received more and more attention. In the process of water drive development, heterogeneous reservoirs are prone to form water flow dominant channels, resulting in inefficient or ineffective circulation of injected water. Profile control technology is to inject profile control agents from water wells to block dominant channels and adjust the seepage field of the original water drive reservoir, thereby expanding the sweep system of subsequent injected water and achieving the effect of stabilizing oil and reducing water. The key to achieving this goal is the design of the profile control plug.

[0003] In the relevant profile control plug structure design scheme, designers divide the plugs into different types and then carry out multi-stage composite, or divide the treatment depth into different depths and match plugs of different strengths, so as to implement profile control technology, block the dominant water flow channel, and then allow subsequent injected water to enter other layers to tap the potential of remaining oil.

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

[0005] The embodiments of the present application provide a slug treatment method, device, equipment, medium and program product for profile control, which can improve the efficiency of slug treatment. The technical solution is as follows:

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

[0007] Taking one third of the oil-water well distance of the target area as the depth for segmentation, N unit slugs are obtained, where N is an integer greater than or equal to 1;

[0008] Based on the permeability of the water flow dominant channel in the target area, query the matching coefficient table of the polymer gel and the oil reservoir, obtain the upper and lower limits of the matching coefficient between the polymer gel and the oil reservoir, and establish a matching coefficient curve formula according to the upper and lower limits of the matching coefficient; the matching coefficient curve formula is used to express the relationship between the depth and the matching coefficient;

[0009] According to the matching coefficient curve formula, obtaining the matching coefficient of each of the unit slugs;

[0010] According to the matching coefficient of each of the unit slugs and the permeability of the water flow dominant channel, the strength of the polymer gel of each of the unit slugs is obtained;

[0011] querying the concentration and strength table of the polymer gel to obtain the concentration value of the polymer gel of each unit slug;

[0012] The unit slugs having the same concentration of the polymer gel are grouped as one injection slug, and the injection amount of each injection slug is calculated.

[0013] In another aspect, a slug processing device for profile control is provided, the device comprising:

[0014] A unit slug segmentation module is used to segment the target area at a depth of one third of the oil-water well spacing to obtain N unit slugs, where N is an integer greater than or equal to 1;

[0015] A matching coefficient curve formula establishment module is used to query the polymer gel and oil reservoir matching coefficient table, obtain the upper and lower limits of the polymer gel and oil reservoir matching coefficient and establish a matching coefficient curve formula;

[0016] A polymer gel and oil reservoir matching coefficient acquisition module is used to query the polymer gel and oil reservoir matching coefficient table based on the water flow dominant channel permeability of the target area, obtain the upper and lower limits of the polymer gel and oil reservoir matching coefficient, and establish a matching coefficient curve formula according to the upper and lower limits of the matching coefficient, wherein the matching coefficient curve formula is used to express the relationship between the depth and the matching coefficient;

[0017] A polymer gel strength acquisition module, used for acquiring the strength of the polymer gel of each of the unit slugs according to the matching coefficient of each of the unit slugs and the water flow dominant channel permeability;

[0018] A polymer gel concentration acquisition module, used to query the concentration and strength table of the polymer gel, and obtain the concentration value of the polymer gel of each unit slug;

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

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

[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 unit slug with the deepest depth 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 unit slug with the shallowest depth among the N unit slugs;

[0023] The matching coefficient curve formula is obtained by calculating the parameters of the logarithmic function according to 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.

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

[0025] Obtaining an end value of a depth range of each of the unit slugs;

[0026] The end values ​​of the depth range of each unit slug are respectively substituted 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 to:

[0028] querying the strength interval of the polymer gel corresponding to the unit slug;

[0029] Querying the concentration and strength table of the polymer gel to obtain the concentration interval of the polymer gel corresponding to the strength interval of the unit slug;

[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 according to pressure field experimental measurements.

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

[0033] Calculating the injection volume of each unit slug;

[0034] The injection amount of the injected slugs is obtained by adding the injection amounts of the unit slugs having the same polymer gel concentration.

[0035] On the other hand, a computer device is provided, comprising a processor and a memory, wherein the memory stores at least one computer program, and the at least one computer program is loaded and executed by the processor to implement the above-mentioned slug processing method for profile adjustment.

[0036] On the other hand, a computer-readable storage medium is provided, wherein at least one computer program is stored in the computer-readable storage medium, and the computer program is loaded and executed by a processor to implement the above-mentioned slug processing method for profile adjustment.

[0037] In another aspect, a computer program product is provided, the computer program product comprising a computer program, the computer program being stored in a computer-readable storage medium. A processor of a computer device reads the computer program from the computer-readable storage medium, and the processor executes the computer program, so that the computer device executes the slug processing method for profile adjustment in the above-mentioned various optional implementations.

[0038] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0039] When designing the profile control plug using polymer gel, the objective factor of pressure field is fully taken into consideration. Under the premise of ensuring that the numerical change of the matching coefficient is smaller than the change of the pressure field, a matching coefficient curve formula is established, so that the designed polymer gel plug and the reservoir pressure field are more matched, effectively avoiding human influence and ensuring the objectivity of the plug design, which makes the plug design more reasonable and more accurate. The corresponding analysis and calculation are mature, simple and easy to implement with computer, realizing the quantification of polymer gel plug design. Through the development of supporting software, the software of polymer gel plug design can be realized, providing a basis for the realization of digital profile control in the future. On the other hand, based on the previous basis, the design cost is also reduced by using different concentrations of polymer gel for different plug designs. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0041] Figure 2 is a flow chart of a slug treatment for profile control provided by one embodiment of the present application;

[0042] Figure 3 is a curve diagram of pressure field and polymer gel strength in a water injection well provided by an embodiment of the present application;

[0043] Figure 4 is a flow chart of a slug treatment for profile control provided by one embodiment of the present application;

[0044] Figure 5 is a flow chart of a slug treatment for profile control provided by one embodiment of the present application;

[0045] Figure 6 is a block diagram of a slug processing device for profile control provided by one embodiment of the present application;

[0046] Figure 7 It is a structural block diagram of a computer device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0047] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0048] 1) Profile adjustment: The profile adjustment technology involved in this application belongs to the field of oil extraction, in which profile adjustment refers to the operation of plugging high permeability layers from water injection wells, which can adjust the water absorption profile of the water injection layer section. Oil profile adjustment refers to improving the production capacity of oil wells by injecting specific chemicals or polymers in oil fields, reducing the interaction between oil and water in oil wells, and thus increasing the recovery rate of crude oil.

[0049] 2) Slug: refers to the obvious oil displacement zone formed after the oil displacement agent is injected into the oil layer, and then it is displaced by another oil displacement agent. At this time, the oil displacement zone formed by the former oil displacement agent is called a slug. The main function of the slug is to control the flow of underground fluids, usually to isolate groundwater sources or control the fluid in the oil well to achieve the maximum efficiency of oil and gas recovery. They can also be used to prevent the migration of pollutants and maintain the stability of the wellbore. In artificial profile control or downhole engineering, operators can inject specific plugging materials to create a slug structure.

[0050] 3) Profile control agent: A chemical used in the field of petroleum engineering that can adjust the water injection formation suction profile to improve the recovery rate and production capacity of oil wells. These chemicals are usually used in oil field profile control to reduce the interfacial tension between crude oil and groundwater, improve the fluidity of crude oil, and thus improve oil recovery efficiency.

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

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

[0053] The above-mentioned oil profile control plug management system 120 may be an independent oil profile control plug management system, or a cluster or distributed system of oil profile control plug management systems composed of multiple oil profile control plug management systems. The computer-aided design software tool 110 may be a software tool for computer-aided control of manufacturing equipment, assisting in engineering analysis and simulation, assisting in the management of visualized geographic spatial data, and for oil profile control plug design and oil profile control plug 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 make any limitation here.

[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 accessed into the profile control slug management system 120.

[0056] Please refer to Figure 2 , which shows a flow chart of a slug processing for profile adjustment provided by an embodiment of the present application. The method can be executed by a computer device, for example, the method can be executed by a computer device running a software tool, and the software tool can be Figure 1 The computer-aided design software tool 110 in the implementation environment is as follows: Figure 2 As shown, the method may include the following steps:

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

[0058] In the embodiment of the present application, the distance between the water injection well and the oil production well can be obtained, and one third of the distance is taken as the depth of the profile adjustment treatment. The depth is divided into N unit plugs, and each unit plug corresponds to a depth range.

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

[0060] In an embodiment of the present application, the polymer gel and reservoir matching coefficient table can be queried through the permeability of the water flow dominant channel to obtain the upper and lower limits of the polymer gel and reservoir matching coefficient, and the matching coefficient curve formula can be established based on the upper and lower limits of the polymer gel and reservoir matching coefficient.

[0061] The above-mentioned water flow dominant channel permeability refers to the permeability related to the water flow channel in the oil and water layer in the underground reservoir. The water flow dominant channel usually has a higher permeability than other parts in the reservoir, allowing water or other fluids to flow more easily. The permeability of the above-mentioned water flow dominant channel can be measured downhole by logging tools, or obtained by detecting groundwater in monitoring wells, or obtained by staff collecting core samples and testing them in the laboratory.

[0062] In the embodiment of the present application, the strength of the corresponding polymer gel can be found according to 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 in combination with 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 Polymer gel and reservoir matching coefficient

[0064]

[0065] The profile control system involved in the present application is a polymer gel system that adapts to the temperature and salinity of the oil reservoir; the basic data involved include: the distance between oil and water wells L (unit: meter), the profile control treatment depth Rt; the permeability K of the dominant water flow channel, the layer thickness h of the dominant water flow channel, the porosity Φ, and the fluid sweep coefficient ρ.

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

[0067] λ=σ / k(1)

[0068] The above matching coefficient is a dimensionless number, which represents the matching degree of the polymer gel at a certain permeability. The matching coefficient is not only related to the permeability of the treated layer, but also to the strength of the polymer gel. Among them, σ represents the gel strength, which is the strength of the polymer gel after a certain period of curing under reservoir conditions, and the unit is mPa.s; k represents the permeability of the high permeability water-absorbing layer, and the unit is mD.

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

[0070] The matching coefficient exists in an interval range [λ min ,λ max ],λ min It is the minimum value of the matching coefficient, which means that when a polymer gel solution of a certain concentration is injected into a sand-filled pipe at a certain permeability and maintained at reservoir temperature for 30 days, subsequent water flooding is carried out. When the water flooding breakthrough pressure is 1 times the maximum pressure when the gel solution is injected, it indicates that the high permeability layer is blocked to a certain extent. min The strength of the medium gel is the gel strength of the gel solution prepared indoors at this concentration and cured for a certain period of time at reservoir temperature. max It is the maximum value of the matching coefficient. Generally, it means that at this permeability, after injecting a certain concentration of polymer gel, the high permeability layer is completely blocked, and subsequent injection cannot be made, and the injection pressure is infinite.max The strength of the medium gel is the gel strength of the gel solution prepared indoors at this concentration and cured for a certain period of time at reservoir temperature.

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

[0072] λ=a*ln(x)+b(2)

[0073] Where x is the treatment depth of each section; the values ​​of a and b are determined by the upper and lower limits of the matching coefficient, that is, the matching coefficient is λ at the end value of the first unit segment plug. max , the end value of the last unit slug is the matching coefficient λ min , and the values ​​of a and b are calculated.

[0074] 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 unit slug with the deepest depth among the N unit slugs;

[0075] 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 unit slug with the shallowest depth among the N unit slugs;

[0076] According to 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 set of two-variable linear equations is listed, 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, the end value of the depth range of the first unit slug is x=5, λ=λ max = 28; the processing depth of the last unit slug is 95-100m, the end value of the depth range of the second unit slug is x = 100, λ = λ min =4.5, substitute it into formula (2), calculate the coefficients a and b, and obtain the values ​​of a and b. The formula generated is shown in formula (3):

[0078] λ=-7.847*ln(x)+40.599(3)

[0079] Before the above steps, we also need to obtain the concentration and strength table of polymer gel according to the pressure field experiment. These data can be obtained by laboratory experiments. Take a certain amount of polymer gel, dry it in an oven, and then use a viscometer to measure the concentration of the polymer gel at this time. Then measure the strength of the polymer concentration at this concentration, organize the measurement data, and make it into the following Table 2.

[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 strength of gel cured for a certain period of time at reservoir temperature, and C1 is the lowest concentration of this type of polymer gel that can gel under reservoir conditions.

[0083] The acquisition of the parameters of the above polymer gel concentration and strength table is not limited to the above measurement method, which is only an exemplary description here.

[0084] In this scheme, it is necessary to ensure that the numerical change is consistent with the change of the reservoir pressure field, ensure that the numerical change of the matching coefficient is smaller than the change of the pressure field, and ensure effective plugging of each depth part of the reservoir.

[0085] Please refer to Figure 3 , which shows a curve diagram of the pressure field and polymer gel strength in a water injection well. Figure 3 As shown:

[0086] Curve A 301 represents the reservoir pressure curve, curve a 302, curve b 304 and curve c 303 represent polymer gel strength curves of different concentrations, wherein the strength of polymer gel c represented by curve c 303 is the smallest, and the strength of polymer gel b represented by curve b 304 is the largest, and 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 enough to effectively plug the reservoir at this depth.

[0087] The pressure is small when close to the water well. The deeper the well distance, the smaller the pressure. The numerical change of the matching coefficient of polymer gel a 302 is consistent with the change of the pressure field. At this time, polymer gel a is just filled. The change amplitude of curve 304b is smaller than the change of the pressure field, which means that the strength of polymer gel b is greater than the strength of polymer gel a, that is, greater than the strength of the pressure field. The polymer gel strength is greater than the pressure field strength, which can fill better and perform more effective plugging.

[0088] Step 203: According to the matching coefficient curve formula, the matching coefficient between the polymer gel and the reservoir of each unit segment plug is obtained.

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

[0090] Substitute the end values ​​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 polymer gel and reservoir matching coefficient of 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 is respectively 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 0-100 meters is selected, and the end value 15 of the depth range of the unit slug is substituted into the formula (3), and the matching coefficient is obtained to be 19.349.

[0093] Step 204: According to the matching coefficient of each unit slug and the permeability of the water flow dominant channel, the strength of the polymer gel of each unit slug is obtained.

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

[0095] After the matching coefficient of each unit slug is obtained according to the above step 203, it is substituted into formula (1) in combination with the permeability of the dominant water flow channel to calculate the polymer gel strength of each unit slug.

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

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

[0098] According to the polymer gel concentration and strength table, the corresponding gel strength interval is found, and then the polymer concentration interval is obtained. In order to ensure the reliability of plugging the high permeability water absorption layer, the upper limit of the concentration interval is assigned as the polymer gel concentration of each unit slug.

[0099] Step 206: Unit slugs with the same polymer gel concentration are grouped as one injection slug, and the injection volume of each injection slug is calculated.

[0100] The concentration is determined by classification method, and the same assigned concentration is classified into one injection slug. The injection volume of the injection slug is calculated according to the number of unit slugs contained in the injection slug.

[0101] In the embodiment of the present application, the numerical change is ensured to be consistent with the change of the reservoir pressure field and the numerical change of the matching coefficient is ensured to be smaller than the change of the pressure field.

[0102] In the embodiment of the present application, under the premise of ensuring that the numerical change of the matching coefficient is smaller than the change of the pressure field, a matching coefficient curve formula is established, so that the designed polymer gel slug and the reservoir pressure field are more matched, effectively avoiding human influence, ensuring the objectivity of the slug design, making the slug design more reasonable and the design accuracy higher; on the other hand, based on the above, by using different concentrations of polymer gel for different slug designs, the design cost is also reduced.

[0103] based on Figure 2 , please refer to Figure 4 , which shows a flow chart of a slug processing for profile adjustment provided by an embodiment of the present application. The method can be executed by a computer device, for example, the method can be executed by a computer device running a software tool, and the software tool can be Figure 1 The computer-aided design software tool 110 in the implementation environment is Figure 4 In the illustrated embodiment, step 205 may be implemented as step 205a, step 205b, and step 205c:

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

[0105] The concentration and strength table of polymer gel is obtained based on the pressure field experimental measurements.

[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 then the concentration of the polymer gel can be measured. The measured strength data was matched with the concentration data, and the relationship between strength and concentration was established to produce a concentration and strength table of the polymer gel.

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

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

[0109] Step 205c: 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.

[0110] According to Table (2), the strength interval of the polymer gel corresponding to the unit slug is obtained by querying, and then the concentration interval of the unit slug is obtained by querying the table corresponding to the strength interval, and then the upper limit of the concentration interval is taken as the concentration of the polymer gel.

[0111] In the embodiment of the present application, the upper limit of the concentration range is selected as the value assigned to the polymer gel concentration of each unit slug. The greater the polymer gel concentration, the greater the strength. The greater the strength, the reliability of plugging the water absorption layer can be improved, thereby making the slug design effect better.

[0112] based on Figure 2 , please refer to Figure 5 , which shows a flow chart of a slug processing for profile adjustment provided by an embodiment of the present application. The method can be executed by a computer device, for example, the method can be executed by a computer device running a software tool, and the software tool can be Figure 1 The computer-aided design software tool 110 in the implementation environment is Figure 5 In the illustrated embodiment, step 206 may be implemented as step 206a and step 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 layer thickness of the dominant channel of the water flow, and ρ represents the sweep coefficient.

[0117] For example, if the depth range of the unit slug is 0-5 m, let r be equal to 0 and 5 respectively and substitute into formula (4). When r is 0, the calculated injection volume is A, and 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 the injection amounts of each unit slug having the same injection polymer gel concentration to obtain the injection amount of the injection slug.

[0119] The concentration is determined by classification method, and the unit slugs with the same assigned concentration are classified as one injection slug. The injection amounts of all unit slugs in the same injection slug are added together to obtain the total injection amount required for the injection slug.

[0120] In the embodiments of the present application, polymer gels of different concentrations are used for design according to different treatment depths, so that the designed slugs are more suitable for different treatment depths, thereby improving the accuracy of the slug design. On the other hand, the use of polymer gels of different concentrations reduces material costs.

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

[0122] Table 3 Polymer gel and reservoir matching coefficient

[0123] Permeability of water flow dominant channel (mD) 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 polymer gel

[0125]

[0126] According to 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 as 1 / 3 of the distance between wells, so the optimal treatment depth is 100 meters. The optimal treatment depth is evenly divided into 20 segments of 5 meters each, and the injection volume of each unit segment is calculated and filled in Summary Table 5.

[0128] (2) Establish the matching coefficient curve formula: The permeability of the high permeability layer is 1035mD, so the matching coefficient when the total permeability is 1000mD in Table 3 is selected. According to the matching coefficient curve formula generation method, the treatment depth of the first unit slug is 0-5m, when x=5m, λ=λmax=28; the treatment depth of the last unit slug is 95-100m, when the treatment depth x=100m, λ=λmin=4.5; calculate the coefficients a and b, and generate the formula 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 treatment depth of each unit slug, such as 10, 15, 20 to 95, and the matching coefficient corresponding to the remaining sections is calculated. Then the data is filled in Summary Table 5.

[0130] (4) Determine the polymer gel strength corresponding to each unit slug: According to 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 of each unit slug: According to Table 4 of polymer gel concentration and strength, find out the corresponding gel strength interval, and then get the polymer concentration interval. In order to ensure the reliability of plugging the high permeability water absorption layer, the upper limit of the concentration interval is assigned as the polymer gel concentration of each unit slug.

[0132] (6) Determine the concentration and injection volume of each injection slug: The concentration is determined by classification, and the slugs with the same assigned concentration are classified 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] ① Concentration and injection volume of each injection slug at a treatment depth of 50 m: The unit slug ends at 50 m, and the concentrations of the previous unit slugs are classified into two categories: 0.5% and 0.4%. These two different concentrations are the two injection slugs. Then calculate the injection volume of each injection slug and fill in Summary Table 5.

[0134] ② Determine the concentration and injection volume of each injection slug when the treatment depth is 70m: The unit slug ends at 70m, and 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 in 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, and 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 in Summary Table 5.

[0136] Table 5 Summary of polymer gel profile control plug design for GX-1 well

[0137]

[0138]

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

[0140] 1) When the treatment depth is 50m, it is divided into 2 sections: the first section has a polymer gel concentration of 0.4% and an injection volume of 1661m 3 ; The second section plug has a polymer gel concentration of 0.5% and an injection volume of 164m 3 ;

[0141] 2) When the treatment depth is 70m, it is divided into 3 sections: the first section has a polymer gel concentration of 0.3% and an injection volume of 1369m 3 ; The second section of the plug has a polymer gel concentration of 0.4% and an injection volume of 2044m 3 ; The third section of the plug has a polymer gel concentration of 0.5% and an injection volume of 164m 3 ;

[0142] 3) When the treatment depth is 90m, it is divided into 3 sections: the first section has a polymer gel concentration of 0.3% and an injection volume of 3705m 3 ; The second section of the plug has a polymer gel concentration of 0.4% and an injection volume of 2044m 3 ; The third section of the plug has a polymer gel concentration of 0.5% and an injection volume of 164m 3 .

[0143] The following is an embodiment of the device of the present application, which can be used to execute the embodiment of the method of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the method of the present application.

[0144] Please refer to Figure 6 , which shows a block diagram of a slug design device using polymer gel profile control provided by an embodiment of the present 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 a depth of one third of the oil-water well distance to obtain N unit slugs, where N is an integer greater than or equal to 1;

[0146] A matching coefficient curve formula establishment module 602 is used to query the polymer gel and oil reservoir matching coefficient table, obtain the upper and lower limits of the polymer gel and oil reservoir matching coefficient and establish a matching coefficient curve formula;

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

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

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

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

[0152] 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 unit slug with the deepest depth among the N unit slugs;

[0153] 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 unit slug with the shallowest depth among the N unit slugs;

[0154] According to 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 to:

[0156] Get the end value of the depth of each unit slug;

[0157] Also used for

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

[0159] Substitute the end values ​​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 to:

[0161] Query the strength interval of the polymer gel corresponding to the unit slug;

[0162] Query the concentration and strength table of the polymer gel to obtain the concentration range of the polymer gel corresponding to the strength range of the unit slug and the concentration range of the polymer gel corresponding to the unit slug;

[0163] The upper limit of the concentration range of the unit slug is taken as the concentration of the polymer gel used for the 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 according to pressure field experimental measurements.

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

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

[0167] The injection amount of each unit slug with the same injection polymer gel concentration is added together to obtain the injection amount of the injection slug.

[0168] Figure 7 The structure block diagram of a computer device 700 provided by an exemplary embodiment of the present application is shown. For example, a personal computer, a smart phone, and a tablet computer. The computer device 700 may also be called a user device or other names.

[0169] Typically, the 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, flash memory storage devices. In some embodiments, the non-transitory computer-readable storage medium in the memory 702 is used to store at least one instruction, which is used to be executed by the processor 701 to implement all or part of the steps performed by the computer-aided design software tool in the method provided in the embodiment of the present application.

[0171] In some embodiments, the computer device 700 may further 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 , including but not limited to: an acceleration sensor 710 , a gyroscope sensor 711 , a pressure sensor 712 , an optical sensor 713 , and a proximity sensor 714 .

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

[0174] In an 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 above embodiments. For example, the computer-readable storage medium can be a read-only memory, a random access memory, a read-only optical disk, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0175] In an exemplary embodiment, a computer program product is also provided, the computer program product includes a computer program, the computer program is stored in a computer-readable storage medium. A processor of a computer device reads the computer program from the computer-readable storage medium, and the processor executes the computer program, so that the computer device executes all or part of the steps in the methods shown in the above embodiments.

[0176] Before collecting relevant user data and during the process of collecting relevant user data, the present application can display a prompt interface, pop-up window or output voice prompt information. The prompt interface, pop-up window or voice prompt information is used to prompt the user that its relevant data is currently being collected, so that the present application starts to execute the relevant steps of obtaining relevant user data only after obtaining the user's confirmation operation on the prompt interface or pop-up window. Otherwise (that is, when the user's confirmation operation on the prompt interface or pop-up window is not obtained), the relevant steps of obtaining relevant user data are terminated, that is, the user's relevant data is not obtained.

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

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

[0179] It should be understood that the "plurality" mentioned in this article refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

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

Claims

1. A slug treatment method for profile control, characterized in that: The method comprises: Taking one third of the oil-water well distance of the target area as the depth for segmentation, N unit slugs are obtained, where N is an integer greater than or equal to 1; Based on the permeability of the water flow dominant channel in the target area, query the matching coefficient table of the polymer gel and the oil reservoir, obtain the upper and lower limits of the matching coefficient between the polymer gel and the oil reservoir, and establish a matching coefficient curve formula according to the upper and lower limits of the matching coefficient, wherein the matching coefficient curve formula is used to express the relationship between the depth and the matching coefficient; According to the matching coefficient curve formula, obtaining the matching coefficient of each of the unit slugs; According to the matching coefficient of each of the unit slugs and the permeability of the water flow dominant channel, the strength of the polymer gel of each of the unit slugs is obtained; querying the concentration and strength table of the polymer gel to obtain the concentration value of the polymer gel of each unit slug; The unit slugs having the same concentration of the polymer gel are grouped as one injection slug, and the injection amount of each injection slug is calculated.

2. The method according to claim 1, characterized in that The matching coefficient curve formula has a depth value as an input parameter and a logarithmic function of the matching coefficient as an output result. The upper and lower limits of the matching coefficient establish the matching coefficient curve formula, including: 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 unit slug with the deepest depth 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 unit slug with the shallowest depth among the N unit slugs; The parameters of the logarithmic function are calculated according to 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 The step of obtaining the polymer gel and reservoir matching coefficient of each unit slug according to the matching coefficient curve formula includes: Obtaining an end value of a depth range of each of the unit slugs; The end values ​​of the depth range of each unit slug are respectively substituted 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 of each unit slug, the method further includes: The concentration and strength table of the polymer gel is obtained based on the pressure field experimental measurement.

5. The method according to claim 4, characterized in that The method includes: querying the strength interval of the polymer gel corresponding to the unit slug; Querying the concentration and strength table of the polymer gel to obtain the concentration interval of the polymer gel corresponding to the strength interval of the unit slug; 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 unit slugs with the same concentration of the polymer gel are classified as one injection slug, and the injection amount of each injection slug is calculated. The method comprises: Calculating the injection volume of each unit slug; The injection amount of the injected slugs is obtained by adding the injection amounts of the unit slugs having the same polymer gel concentration.

7. A slug processing device for profile control, characterized in that: The device comprises: The unit slug segmentation module is used to segment the depth of one third of the oil-water well distance to obtain N unit slugs, where N is an integer greater than or equal to 1; A matching coefficient curve formula establishment module is used to query the polymer gel and oil reservoir matching coefficient table, obtain the upper and lower limits of the polymer gel and oil reservoir matching coefficient and establish a matching coefficient curve formula; A polymer gel and oil reservoir matching coefficient acquisition module, used to obtain the polymer gel and oil reservoir matching coefficient of each unit segment plug according to the matching coefficient curve formula; A polymer gel strength acquisition module, used for acquiring the strength of the polymer gel of each unit slug according to the polymer gel and reservoir matching coefficient of each unit slug and the matching coefficient curve formula; A polymer gel concentration acquisition module, used for querying the concentration and strength table of the polymer gel to obtain the concentration value of the polymer gel of each unit slug; The injection slug module classifies the unit slugs with the same concentration of the polymer gel into one injection slug, and calculates the injection amount of each injection slug.

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

9. A computer-readable storage medium, characterized in that: At least one computer program is stored in the computer-readable storage medium, and the computer program is loaded and executed by the processor to implement the slug processing method for profile control according to any one of claims 1 to 6.

10. A computer program product, characterized in that The computer program product includes computer instructions, which are 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 according to any one of claims 1 to 6.

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