Chemical diversion acidizing staged method for multilayer medium-high permeability sandstone reservoir

Abstract

The application discloses a multi-layer medium-high permeability sandstone reservoir chemical diversion acidification grading method. The method comprises the following steps: according to the permeability of the multi-layer sandstone reservoir, determining the permeability grading of the target layer of the target well as extra-high permeability reservoir, high permeability reservoir or medium permeability reservoir; according to the production permeability profile of the multi-layer sandstone reservoir, determining the non-uniform degree of the permeability of the target well; and according to the grading type and the non-uniform degree of the permeability of the target well, determining the required diversion material. The method can optimize the design of the diversion acidification process by starting from the reservoir characteristics, combining different diversion materials and construction schemes, improving the effective rate of the diversion acidification, establishing the connection between the different diversion materials and the reservoir characteristics, clearly defining the diversion requirements of the different characteristic reservoirs, selecting the adaptive diversion chemical materials, systematically and efficiently improving the reconstruction of the low-permeability layer by the diversion acidification operation, and has wide practical value and application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil exploitation, in particular to a chemical diversion acidification grading method suitable for multi-layer medium-high permeability sandstone reservoirs. BACKGROUND

[0002] The homogeneity of oil and gas reservoirs is relative, rather than absolute heterogeneity. Due to the heterogeneity of the reservoir, if the conventional acidification process is used to acidize the reservoir, the acid liquid will form a "pointing" phenomenon in the high permeability layer and large pores and cracks, and the low permeability layer and small pores cannot be effectively modified. In order to improve the acidification effect, the most common measure is the temporary plugging diversion method.

[0003] There are mainly two kinds of sandstone reservoir diversion acidification technologies at present, one is mechanical diversion, and the other is chemical diversion. However, mechanical diversion has certain limitations in application, such as the wells with small distance between layers or perforation sections cannot use tool sealing, the tool lifting process is complicated and the construction cost is high, and effective diversion within the layer cannot be achieved. Therefore, chemical diversion is widely used in sandstone reservoir acidification. For this reason, domestic and foreign scholars have carried out a lot of basic theory and product development work around the "diversion, uniform plugging removal" in the stimulation measures, and have achieved certain results. The main technical focus is the development of chemical diversion materials. The existing diversion materials include fibers, gels (high molecular gels and viscoelastic surfactants), particles, etc., and mainly focus on the research of temperature resistance and salt resistance of the materials. However, there is a lack of research on the diversion characteristics of different materials combined with the characteristics of the reservoir heterogeneity, that is, there is a lack of guiding theory for the selection of diversion materials for different reservoir characteristics. In order to solve the problems of the existing diversion acidification technology for heterogeneous sandstone reservoirs, especially the lack of theoretical guidance, it is urgent to study the diversion acidification grading method for heterogeneous sandstone reservoirs. SUMMARY

[0004] In order to overcome the above-mentioned problems existing in the prior art and more conveniently and effectively realize the diversion acidification technology for heterogeneous sandstone reservoirs, the present application provides a chemical diversion acidification grading method for multi-layer medium-high permeability sandstone reservoirs. The method can effectively guide the diversion acidification design for multi-layer medium-high permeability sandstone reservoirs, that is, the chemical diversion acidification grading treatment method is given for different permeability ranges of the reservoir. The present application combines the characteristic parameters of heterogeneous sandstone reservoirs, the physicochemical properties of chemical diversion materials, and the diversion effect characteristics. The chemical diversion acidification grading treatment method for multi-layer medium-high permeability sandstone reservoirs is formed, which can optimize the diversion acidification process by starting from the characteristics of the reservoir and combining different diversion materials and construction schemes, and improve the diversion acidification effect.

[0005] To achieve the above-mentioned purposes, the technical scheme adopted by the present application is as follows:

[0006] In a first aspect, the present application provides a chemical diversion acidification grading method for multi-layer medium-high permeability sandstone reservoirs, comprising:

[0007] According to the permeability of the multi-layer sandstone reservoir, the permeability classification of the target layer of the target well is determined as ultra-high permeability reservoir, high permeability reservoir or medium permeability reservoir;

[0008] Determine the degree of non-uniformity of permeability of the target well based on the production permeability profile of the multi-layer sandstone reservoir;

[0009] The required diversion material is determined based on the permeability classification type and the degree of permeability non-uniformity of the target well.

[0010] In the above-mentioned chemical diversion acidification classification method for multi-layer medium- and high-permeability sandstone reservoirs, the method for determining the permeability classification of the target well and target layer includes:

[0011] If K≥2000mD, it is determined to be an ultra-high permeability reservoir; if 500mD≤K<2000mD, it is determined to be a high permeability reservoir; if 50mD≤K<500mD, it is determined to be a medium permeability reservoir;

[0012] Where K is the permeability.

[0013] In the above-mentioned chemical diversion acidification classification method for multi-layer medium- and high-permeability sandstone reservoirs, determining the degree of heterogeneity of the permeability of the target well includes:

[0014] The statistical layer P, thickness H and permeability K are denoted as P i (H i , K i ), and P i (H i , K i ) Press K i Arranged in ascending order, where i is the numerical number of each layer of the target well production profile;

[0015] Press K i The permeability is divided into three sections by size. The first section is (K min ) to (K min +(K max -K min ) / 4), the second segment is (K min +(K max -K min ) / 4) to (K min +(K max -K min )3 / 4), the third section is (K min +(K max -K min )3 / 4) to K max ;

[0016] Calculate the total thickness M of each section i =ΣH iM1, M2, M3 and ΣM; wherein M1 represents the thickness of the first section of the permeability interval, M2 represents the thickness of the second section of the permeability interval, M3 represents the thickness of the third section of the permeability interval, and ΣM represents the total thickness of the three sections.

[0017] Further, the determining the required diverting material comprises:

[0018] The grading zone is a high permeability reservoir, and the diverting material comprises, by mass percentage, 0.3-0.8% of a polymer compound, 1-5% of a pH regulator, 0-5% of a bridging agent, 0.1-1% of a corrosion inhibitor, and the balance of water; the diverting material is further determined according to the relative size between M2 / ΣM and 70% and / or the relative size between M1 and M3;

[0019] The grading zone is a high permeability reservoir, and the diverting material comprises, by mass percentage, 0.3-0.8% of a polymer compound, 1-5% of a pH regulator, 0-5% of a bridging agent, 0.1-1% of a corrosion inhibitor, and the balance of water; the diverting material is further determined according to the relative size between M2 / ΣM and 70% and / or the relative size between M1 and M3;

[0020] The grading zone is a high permeability reservoir, and the diverting material comprises, by mass percentage, 0.3-0.8% of a polymer compound, 1-5% of a pH regulator, 0-5% of a bridging agent, 0.1-1% of a corrosion inhibitor, and the balance of water; the diverting material is further determined according to the relative size between M2 / ΣM and 70% and / or the relative size between M1 and M3;

[0021] Further, the determining the required diverting material comprises:

[0022] The grading zone is a high permeability reservoir, and the diverting material comprises, by mass percentage, 0.3-0.8% of a polymer compound, 1-5% of a pH regulator, 0-5% of a bridging agent, 0.1-1% of a corrosion inhibitor, and the balance of water; the diverting material is further determined according to the relative size between M2 / ΣM and 70% and / or the relative size between M1 and M3;

[0023] If M2 / ΣM < 80% and M3 ≥ M1, the diverting material comprises, by mass percentage, 0.6-0.8% of a polymer compound, 0.1-0.2% of a crosslinking agent, 1-5% of a pH regulator, 5-15% of a solid phase forming agent, 0.1-1% of a corrosion inhibitor, and the balance of water; as an example, the diverting material comprises, by mass percentage, 0.6% of a polymer compound, 0.2% of a crosslinking agent, 5% of a pH regulator, 10% of a solid phase forming agent, 0.3% of a corrosion inhibitor, and the balance of water;

[0024] If M2 / ∑M < 80%, M1≥M3, the diverting material consists of the following components in mass percentage: 0.8-1% of high molecular compound, 0.1-0.2% of crosslinking agent, 1-5% of pH regulator, 10-20% of solid phase forming agent, 0.1-1% of corrosion inhibitor and the balance of water;

[0025] If M2 / ∑M < 60%, M3≥M1, the diverting material consists of the following components in mass percentage: 5-8% of viscoelastic surfactant, 1-5% of pH regulator, 0.1-1% of corrosion inhibitor and the balance of water;

[0026] If M2 / ∑M < 70%, M3≥M1, the diverting material consists of the following components in mass percentage: 0.5-0.6% of high molecular compound, 1-5% of pH regulator, 2-4% of bridging agent, 0.1-1% of corrosion inhibitor and the balance of water; as an example, the diverting material consists of the following components in mass percentage: 0.5% of high molecular compound, 1% of pH regulator, 2% of bridging agent, 0.2% of corrosion inhibitor and the balance of water;

[0027] If M2 / ∑M < 70%, M1≥M3, the diverting material consists of the following components in mass percentage: 0.6-0.8% of high molecular compound, 1-5% of pH regulator, 3-5% of bridging agent, 0.1-1% of corrosion inhibitor and the balance of water;

[0028] If M2 / ∑M < 60%, M3≥M1, the diverting material consists of the following components in mass percentage: 5-8% of viscoelastic surfactant, 1-5% of pH regulator, 0.1-1% of corrosion inhibitor and the balance of water;

[0029] If M2 / ∑M < 60%, M1≥M3, the diverting material consists of the following components in mass percentage: 6-10% of viscoelastic surfactant, 1-5% of pH regulator, 0.1-1% of corrosion inhibitor and the balance of water; as an example, the diverting material consists of the following components in mass percentage: 6% of viscoelastic surfactant, 1% of pH regulator, 0.1% of corrosion inhibitor and the balance of water.

[0030] If M2 / ∑M < 60%, M1≥M3, the diverting material consists of the following components in mass percentage: 6-10% of viscoelastic surfactant, 1-5% of pH regulator, 0.1-1% of corrosion inhibitor and the balance of water; as an example, the diverting material consists of the following components in mass percentage: 6% of viscoelastic surfactant, 1% of pH regulator, 0.1% of corrosion inhibitor and the balance of water.

[0031] The high polymer compound is selected from one or more of sodium alginate, cationic starch, xanthan gum, cationic guar gum, sodium carboxymethyl cellulose, cationic cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, agar powder, and gelatin.

[0032] The bridging agent is selected from one or more of dioctadecyldimethylammonium chloride, dicocoalkyldimethylammonium chloride, methylene bis sodium naphthalene sulfonate, diazimidyl alkyl urea, bis(2-hydroxyethoxy)oleylamine, methylene bis naphthalene sulfonic acid sodium, lauryl amphoteric imidazoline, bis-palmitocarboxyethyl hydroxyethyl methyl sulfate ammonium salt, dodecyl bis hydroxyethyl methyl ammonium chloride, tallow alkyl bis hydroxyethyl amine oxide, and bis-decyl dimethyl ammonium chloride.

[0033] The solid phase forming agent is selected from one or more of sodium benzoate, benzoic acid, oil-soluble phenolic resin, epoxy resin powder, calcium carbonate powder, silica powder, bentonite powder, graphite powder, carbon powder, and wood powder.

[0034] The pH regulator is selected from one or more of ammonium chloride, formaldehyde, sodium bicarbonate, gluconolactone, sodium carbonate, and sodium acetate.

[0035] The viscoelastic surfactant is selected from one or more of erucamide propyl hydroxyl sulfobetaine, cocamide propyl betaine, oleamide propyl betaine, bis(2-hydroxyethoxy)oleylamine, fatty alcohol polyoxyethylene ether sodium sulfate, dodecyl dimethyl amine oxide, coconut oil diethanolamide, octyldecyl glucoside, and palm kernel oil diethanolamide.

[0036] The crosslinking agent is selected from one or more of lactic acid, isopropyl alcohol, triethanolamine, sodium tartrate, acetylacetone, ferric chloride, aluminum chloride, copper chloride, zinc bromide, calcium bromide, barium chloride, calcium chloride, magnesium chloride, and ferrous chloride.

[0037] The corrosion inhibitor is selected from one or more of mercaptan, polyethylene glycol ether, sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate, diethylene triamine, hexamethylene tetramine, butynyl alcohol, butynediol, imidazoline oleic acid, 4-methyl pyridine, 4-vinyl pyridine, formaldehyde, and glyoxal.

[0038] In a second aspect, the present application provides a multi-layer medium-high permeability sandstone reservoir chemical diversion acidification grading device, comprising:

[0039] The grading type determination unit is configured to determine the permeability grading of the target layer of the target well as a super-high permeability reservoir, a high permeability reservoir, or a medium permeability reservoir according to the permeability of the multi-layer sandstone reservoir.

[0040] The non-uniformity determination unit is configured to determine the non-uniformity of the permeability of the target well according to the production permeability profile of the multi-layer sandstone reservoir.

[0041] A steering material determining unit is configured to determine a required steering material according to a grading type of a target well permeability and a non-uniform degree of the permeability.

[0042] In a third aspect, the present application provides a terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method according to any one of the above aspects when executing the computer program.

[0043] In a fourth aspect, the present application provides a computer readable storage medium, which stores a computer program, wherein the computer program implements the steps of the method according to any one of the above aspects when executed by a processor.

[0044] Compared with the prior art, the present application has the following beneficial effects:

[0045] The present application aims at the problem of acidification reconstruction of multi-layer medium-high permeability sandstone reservoir, that is, acid liquid is always injected into high permeability layer in large amount and low permeability layer is difficult to be used in the acidification process, and the reservoir heterogeneity is more serious after acidification, which has been a big problem in acidification operation. The existing chemical steering acidification technology focuses on the development of various chemical steering materials and the research on the plugging capacity of various chemical steering materials. The effective implementation of heterogeneous reservoir steering has not been studied. The present application proposes a chemical steering acidification grading method for multi-layer medium-high permeability sandstone reservoir through experimental research and field practice, which can optimize the design of steering acidification process from the reservoir characteristics combined with different steering materials and construction scheme, and improve the steering efficiency of steering acidification. Compared with the existing steering acidification technology, the present application realizes fine design and management, proposes a steering acidification design method from the reservoir characteristics combined with the performance of steering materials, and can greatly improve the steering effectiveness compared with the previous steering technology, that is, more effectively use the low permeability layer, greatly improve the production and recovery of medium-high permeability sandstone reservoir, and realize efficient exploitation of the reservoir. The present application formulates a steering scheme combined with the reservoir characteristics, instead of the previous blind steering acidification design only focusing on the physical and chemical properties of the steering material. The present application establishes a connection between different steering materials and reservoir characteristics, clearly defines the steering requirements of different characteristic reservoirs, and selects the adaptive steering chemical material. The present application can systematically and efficiently improve the reconstruction of low permeability layer in steering acidification operation, and the method of the present application has wide practical value and application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0047] Figure 1 is the implementation flow diagram of the multi-layer medium-high permeability sandstone reservoir chemical diversion acidification grading method provided by the embodiment of the present application.

[0048] Figure 2 is the schematic diagram of the multi-layer medium-high permeability sandstone reservoir chemical diversion acidification grading device provided by the embodiment of the present application.

[0049] Figure 3 is the schematic diagram of the terminal device provided by the embodiment of the present application.

[0050] The various marks in the drawings are as follows:

[0051] 2-multi-layer medium-high permeability sandstone reservoir chemical diversion acidification grading device; 21-grading type determination unit; 22-non-uniformity degree determination unit; 23-diversion material determination unit;

[0052] 3-terminal device; 30-processor; 31-memory; 32-computer program. DETAILED DESCRIPTION

[0053] In order to illustrate the technical solutions described in the present application, the following will be described by specific embodiments.

[0054] Figure 1 is the implementation flow diagram of the multi-layer medium-high permeability sandstone reservoir chemical diversion acidification grading method provided by the embodiment of the present application. As shown in the figure, the method can include the following steps:

[0055] Step S101, according to the permeability of the multi-layer sandstone reservoir, the permeability grading of the target layer of the target well is determined as extra-high permeability reservoir, high permeability reservoir or medium permeability reservoir;

[0056] In at least one embodiment of the present application, the grading area is determined according to the method for evaluating oil and gas reservoirs SY / T 6285-2011 and reservoir geological data, specifically as follows:

[0057] If K is greater than or equal to 2000 mD, it is determined as an extra-high permeability reservoir; if 500 mD≤K<2000 mD, it is determined as a high permeability reservoir; if 50 mD≤K<500 mD, it is determined as a medium permeability reservoir;

[0058] Wherein, K is the permeability.

[0059] It can be understood that the diversion acidification is applicable to (1) extra-high permeability reservoirs, (2) high permeability reservoirs, (3) medium permeability reservoirs. For (4) low permeability reservoirs, (5) extra-low permeability reservoirs, (6) super-low permeability reservoirs, the diversion acidification is not suitable.

[0060] It can be understood that the permeability of the multi-layer sandstone reservoirs in the present application is the permeability of the main producing layer.

[0061] Step S102, determining the non-uniform degree of the permeability of the target well according to the production permeability profile of the multi-layer sandstone reservoir.

[0062] In at least one embodiment of the present application, the determination of the non-uniform degree of the target well comprises:

[0063] The statistical layer P, thickness H and permeability K are denoted as P i (H i , K i ), and P i (H i , K i ) are arranged in ascending order of K i , wherein i is the numerical number of each layer of the production profile of the target well;

[0064] The permeability is divided into three sections according to the size of K i , the first section is (K min ) to (K min +(K max -K min ) / 4), the second section is (K min +(K max -K min ) / 4) to (K min +(K max -K min )3 / 4), and the third section is (K min +(K max -K min )3 / 4) to K max ;

[0065] The total thickness M i =∑H i of each section is calculated, and M1, M2, M3 and ΣM are obtained; wherein M1 represents the thickness of the first section of the permeability interval, M2 represents the thickness of the second section of the permeability interval, M3 represents the thickness of the third section of the permeability interval, and ΣM represents the total thickness of the three sections.

[0066] Step S103, determining the required diversion material according to the classification type of the permeability of the target well and the non-uniform degree of the permeability.

[0067] In one embodiment of the present application, the graded region is an extra-high permeability reservoir, and the diverting material consists of, by mass percentage, 0.5-1% of a polymer compound, 0.1-0.2% of a crosslinking agent, 1-5% of a pH regulator, 0-20% of a solid-phase forming agent, 0.1-1% of a corrosion inhibitor, and the balance of water; the diverting material is further determined according to the relative size between M2 / ∑M and 80% and / or the relative size between M1 and M3, and the specific criteria are as follows:

[0068] If M2 / ∑M≥80%, the diverting material consists of, by mass percentage, 0.5-0.6% of a polymer compound, 0.1-0.2% of a crosslinking agent, 1-5% of a pH regulator, 0-10% of a solid-phase forming agent, 0.1-1% of a corrosion inhibitor, and the balance of water;

[0069] If M2 / ∑M<80%, M3≥M1, the diverting material consists of, by mass percentage, 0.6-0.8% of a polymer compound, 0.1-0.2% of a crosslinking agent, 1-5% of a pH regulator, 5-15% of a solid-phase forming agent, 0.1-1% of a corrosion inhibitor, and the balance of water;

[0070] If M2 / ∑M<80%, M1≥M3, the diverting material consists of, by mass percentage, 0.8-1% of a polymer compound, 0.1-0.2% of a crosslinking agent, 1-5% of a pH regulator, 10-20% of a solid-phase forming agent, 0.1-1% of a corrosion inhibitor, and the balance of water.

[0071] In another embodiment of the present application, the graded region is a high permeability reservoir, and the diverting material consists of, by mass percentage, 0.3-0.8% of a polymer compound, 1-5% of a pH regulator, 0-5% of a bridging agent, 0.1-1% of a corrosion inhibitor, and the balance of water; the diverting material is determined according to the relative size between M2 / ∑M and 70% and / or the relative size between M1 and M3, and the specific criteria are as follows:

[0072] If M2 / ∑M≥70%, the diverting material consists of, by mass percentage, 0.3-0.5% of a polymer compound, 1-5% of a pH regulator, 0-3% of a bridging agent, 0.1-1% of a corrosion inhibitor, and the balance of water;

[0073] If M2 / ∑M<70%, M3≥M1, the diverting material consists of, by mass percentage, 0.5-0.6% of a polymer compound, 1-5% of a pH regulator, 2-4% of a bridging agent, 0.1-1% of a corrosion inhibitor, and the balance of water;

[0074] If M2 / ∑M < 70%, M1 > M3, the diverting material is composed of 0.6-0.8% high molecular compound, 1-5% pH regulator, 3-5% bridging agent, 0.1-1% corrosion inhibitor and the balance of water in mass percentage.

[0075] In another embodiment of the application, the grading area is a medium-permeability reservoir, and the diverting material is composed of 3-10% viscoelastic surfactant, 1-5% pH regulator, 0.1-1% corrosion inhibitor and the balance of water in mass percentage; the diverting material is further determined according to the relative size between M2 / ∑M and 60% and / or the relative size between M1 and M3, and the specific criteria are as follows:

[0076] If M2 / ∑M < 60%, M3 > M1, the diverting material is composed of 5-8% viscoelastic surfactant, 1-5% pH regulator, 0.1-1% corrosion inhibitor and the balance of water in mass percentage;

[0077] If M2 / ∑M < 60%, M3 > M1, the diverting material is composed of 5-8% viscoelastic surfactant, 1-5% pH regulator, 0.1-1% corrosion inhibitor and the balance of water in mass percentage;

[0078] If M2 / ∑M < 60%, M1 > M3, the diverting material is composed of 6-10% viscoelastic surfactant, 1-5% pH regulator, 0.1-1% corrosion inhibitor and the balance of water in mass percentage.

[0079] In the practice of the application, the reservoir characteristics and production status and transformation targets of target wells are determined by collecting core analysis data and logging data of sandstone reservoirs; and a chemical diverting acidification scheme is formulated according to different reservoir permeability ranges and transformation needs. The method of the application is an effective diverting acidification method proposed based on experiments and combined with field application examples. The experiments are performed according to CN202010942217.X, a device for testing the temporary plugging and shunting effect considering interlayer interference, and CN202010911884.1, a device and method for testing the shunting effect of a shunting agent for acid treatment.

[0080] Figure 2 is a schematic diagram of a multi-layer medium-high permeability sandstone reservoir chemical diverting acidification grading device provided by an embodiment of the application. Only parts related to the embodiments of the application are shown for ease of illustration.

[0081] Figure 2The multi-layer medium-high permeability sandstone reservoir chemical diversion acidification grading device shown can be a software unit, a hardware unit or a combination of software and hardware built into an existing terminal device, can be integrated into the terminal device as an independent pendant, or can exist as an independent terminal device.

[0082] As shown in the figure, the multi-layer medium-high permeability sandstone reservoir chemical diversion acidification grading device 2 comprises:

[0083] The grading type determining unit 21 is configured to determine the permeability grading of the target layer of the target well as an extra-high permeability reservoir, a high permeability reservoir or a medium permeability reservoir according to the permeability of the multi-layer sandstone reservoir.

[0084] The non-uniformity determining unit 22 is configured to determine the non-uniformity of the permeability of the target well according to the production permeability profile of the multi-layer sandstone reservoir.

[0085] The diversion material determining unit 23 is configured to determine the required diversion material according to the grading type and the non-uniformity of the permeability of the target well.

[0086] Figure 3 is a schematic diagram of a terminal device provided by an embodiment of the present application. As shown in the figure, Figure 3 the terminal device 3 of this embodiment comprises a processor 30, a memory 31, and a computer program 32 stored in the memory 31 and executable on the processor 30. The processor 30 implements the steps in the above multi-layer medium-high permeability sandstone reservoir chemical diversion acidification grading method embodiment when executing the computer program 32, such as Figure 1 the steps S101 to S103 shown in the figure.

[0087] For example, the computer program 32 can be divided into one or more modules / units, which are stored in the memory 31 and executed by the processor 30 to complete the present application. The one or more modules / units can be a series of computer program instruction segments capable of completing a specific function, which are used to describe the execution process of the computer program 32 in the terminal device 3. For example, the computer program 32 can be divided into a grading area determining unit, a non-uniformity determining unit and a diversion material determining unit, and the specific functions of each unit are as follows:

[0088] The grading type determining unit is configured to determine the permeability grading of the target layer of the target well as an extra-high permeability reservoir, a high permeability reservoir or a medium permeability reservoir according to the permeability of the multi-layer sandstone reservoir.

[0089] The non-uniformity determining unit is configured to determine the non-uniformity of the permeability of the target well according to the production permeability profile of the multi-layer sandstone reservoir.

[0090] A steering material determining unit is configured to determine a required steering material according to a hierarchical type of a target well permeability and a non-uniform degree of the permeability.

[0091] The terminal device 3 can be a desktop computer, a notebook computer, a palm computer, a cloud server and the like. The terminal device can include, but is not limited to, a processor 30 and a memory 31. Those skilled in the art can understand that, Figure 3 The terminal device 3 is only an example and does not constitute a limitation on the terminal device 3, and can include more or fewer components than shown, or combine certain components, or different components, for example, the terminal device can also include an input / output device, a network access device, a bus and the like.

[0092] The embodiment of the present application also provides a computer readable storage medium, the computer readable storage medium stores a computer program, the computer program is executed by a processor to realize the steps in the above-mentioned multilayer high permeability sandstone reservoir chemical steering acidification grading method embodiment. The computer readable storage medium can be a tangible device that maintains and stores instructions for use by an instruction execution device. The computer readable storage medium can be, but is not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device or any combination thereof. The provided computer readable storage medium realizes the principles and technical effects similar to the above-mentioned method embodiment, which will not be described here.

[0093] The present application will be further described in detail below in conjunction with the specific embodiments. The embodiments given below are only intended to illustrate the present application, and are not intended to limit the scope of the present application. The embodiments provided below can serve as a guide for further improvement by those skilled in the art, and do not constitute a limitation on the present application in any way.

[0094] The experimental methods used in the following examples are conventional methods unless otherwise specified. The materials, reagents, etc. used are commercially available unless otherwise specified.

[0095] Example 1, selection of steering material

[0096] A non-homogeneous seepage experiment device is used to perform experiments according to the patent (CN202021957521.3) one considers interlayer interference temporary plugging and shunting effect experiment device. Three groups of non-homogeneous artificial cores are selected, and the permeability composition is: the first group (300mD-1500mD), the second group (300mD-1000mD), and the third group (1000mD-1500mD) are used for steering experiment test by using different steering agents and steering agent concentrations.

[0097] Table 1 composition of steering material for experiment in example 1

[0098]

[0099] Note: In Table 1, the components in each diverting material are in mass percentage, and include the balance of water.

[0100] Table 2 Experimental diverting test results of Example 1

[0101]

[0102] Experimental results of Example 1:

[0103] (1) B series diverting agents. The first group of experiments failed to achieve effective diversion, the second group B3 agent can achieve effective diversion, the third group B2, B3 can achieve effective diversion.

[0104] (2) C series diverting agents. The first group, the second group C2 agent can achieve effective diversion, the third group C1, C2 can achieve effective diversion.

[0105] (3) The purpose of diversion is to temporarily plug high permeability and exploit low permeability. The first group and the third group have the same high permeability core permeability, but the first group is difficult to achieve diversion. The first group and the second group have the same low permeability core permeability, but the low permeability damage degree is different, that is, the low permeability exploitation will also differ.

[0106] Example 1 shows that it is not possible to blindly focus on diverting materials for construction design, but rather to select diverting materials according to the characteristics of the reservoir, that is, to achieve fine design of diverting acidification. This is beneficial to improve the diversion effect and improve the exploitation efficiency of low permeability reservoirs.

[0107] Example 2, multi-layer high permeability sandstone reservoir chemical diversion acidification grading

[0108] The BZ-1 well engineering modification of offshore BZ oilfield was taken as the implementation object, and the multi-layer high permeability sandstone reservoir chemical diversion acidification grading method was used for diversion design. BZ-1 well is a long well section multi-layer high permeability sandstone reservoir. Due to the space limitation of offshore operation platform, the simplest stimulation modification method is chemical diversion acidification. The well logging of BZ-1 well shows 18 small layers. The permeability of the 18 small layers is 4046 mD, 3734 mD, 3442 mD, 3238 mD, 2738 mD, 2702 mD, 2560 mD, 2262 mD, 2200 mD, 1493 mD, 1288 mD, 802 mD, 653 mD, 573 mD, 338 mD, 227 mD, 137 mD, and 98 mD.

[0109] First step: According to "SY / T 6285-2011 Oil and Gas Reservoir Evaluation Method", the permeability of the main layer of BZ-1 well is higher than 2000 mD, and it is judged that the well is a high permeability reservoir.

[0110] Second step: determine the non-uniform degree of the target well. Query the production permeability profile of the target well; count P i (H i 、K i ) respectively P1(19.6m, 4046mD), P2(28.4m, 3734mD), P3(17.6m, 3442mD), P4(15m, 3238mD), P5(27m, 2738mD), P6(16.1m, 2702mD), P7(25.6m, 2560mD), P8(13.2m, 2262mD), P9(9.8m, 2200mD), P 10 (35.6m, 1493mD), P 11 (7.8m, 1288mD), P 12 (11.5m, 802mD), P 13 (15.3m, 653mD), P 14 (13.5m, 573mD), P 15 (9.1m, 338mD), P 16 (3.6m, 227mD), P 17 (4.9m, 137mD), P 18 (2.3m, 98mD); divide the permeability into 3 sections, the first section K min =98mD to K min +(K max -K min ) / 4=1085mD, the second section 1085mD to (K min +(K max -K min )3 / 4)=3095mD, the third section 3095mD to 4046mD; calculate M i =ΣH i of each section, M1=60.2m, M2=135.1m, M3=80.9 and ΣM=276.2m.

[0111] Third step: Determine the chemical diverting acidizing program according to different classification of reservoir. The main layer of BZ-1 well is extra-high permeability reservoir, and the diverting material is selected as gel type temporary plugging agent A (0.5-1% high polymer + 0.1-0.2% crosslinking agent + 1-5% PH regulator + 0-20% solid forming agent + 0.1-1% corrosion inhibitor). M2 / ∑M = 135.1 / 276.2 = 48.9% < 80%, M3≥M1. The well is mainly high permeability and strong heterogeneous reservoir. Further determine the selection range of A agent (0.6-0.8% high polymer + 0.1-0.2% crosslinking agent + 1-5% PH regulator + 5-15% solid forming agent + 0.1-1% corrosion inhibitor). Further A agent is 0.6% sodium alginate + 0.1% barium chloride + 0.1% acetylacetone + 1% gluconic acid lactone + 2% ammonium chloride + 2% formaldehyde + 10% benzoic acid + 0.3% imidazoline oleic acid, and the rest is water.

[0112] Example 3, multi-layer high permeability sandstone reservoir chemical diverting acidizing classification

[0113] The engineering reconstruction of BZ-2 well in offshore BZ oilfield is taken as the implementation object, and the multi-layer high permeability sandstone reservoir chemical diverting acidizing classification method is used for diverting design. BZ-2 well is a long well section multi-layer high permeability sandstone reservoir. Due to the space limitation of offshore operation platform, the simplest stimulation reconstruction way is chemical diverting acidizing. The permeability of 16 small layers is 1925 mD, 1909 mD, 1725 mD, 1709 mD, 1501 mD, 1213 mD, 898 mD, 810 mD, 657 mD, 520 mD, 343 mD, 313 mD, 269 mD, 139 mD, 134 mD, and 88 mD.

[0114] First step: According to "SY / T 6285-2011 Oil and Gas Reservoir Evaluation Method", the permeability of the main layer of BZ-2 well is between 500 mD and 2000 mD, and it is judged that the well is a high permeability reservoir.

[0115] Second step: Determine the non-uniformity of the target well. Query the production permeability profile of the target well; count P i (H i , K i ) are P1 (12.9 m, 1925 mD), P2 (26.3 m, 1909 mD), P3 (17.8 m, 1725 mD), P4 (19.7 m, 1709 mD), P5 (19.1 m, 1501 mD), P6 (21 m, 1213 mD), P7 (24.2 m, 898 mD), P8 (15 m, 810 mD), P9 (29.1 m, 657 mD), P 10 (18.4 m, 520 mD), P 11 (14.1 m, 343 mD), P12 (13.9m, 313mD), P 13 (12.5m, 269mD), P 14 (10.3m, 139mD), P 15 (7.6m, 134mD), P 16 (6.5m, 88mD); the permeability is divided into 3 sections, the first section K min =88mD to K min +(K max -K min ) / 4=547mD, the second section 547mD to (K min +(K max -K min )3 / 4)=1466mD, the third section is from 1466mD to 1925mD; calculate M for each section i =ΣH i , we get M1=83.3m, M2=89.3m, M3=95.8m and ΣM=268.4m.

[0116] Step 3: Determine the chemical diversion acidizing strategy based on the reservoir's different classification zones. Well BZ-2's primary reservoir is a high-permeability layer, so the diversion material used is a self-healing gel temporary plugging agent, Agent B (0.3-0.8% polymer + 1-5% pH adjuster + 0-5% bridging agent + 0.1-1% corrosion inhibitor). M2 / ΣM = 89.3 / 268.4 = 33.3% < 70%, with M3 ≥ M1. This well features a highly heterogeneous reservoir with a predominantly high permeability. The Agent B selection range was further determined (0.5-0.6% polymer + 1-5% pH adjuster + 2-4% bridging agent + 0.1-1% corrosion inhibitor). Agent B was further formulated as 0.5% cationic guar gum + 1% sodium bicarbonate + 2% dimethyl dimethyl ammonium chloride + 0.2% butynol, with the remainder being water.

[0117] Example 4: Chemical diversion acidification classification of multi-layer medium-permeability sandstone reservoir

[0118] The BZ-3 well in the offshore BZ oilfield was used as a target for diversion design using a graded chemical diversion acidification method for multi-layered medium-to-high permeability sandstone reservoirs. Well BZ-3 has a long well section with multi-layered medium-permeability sandstone reservoirs. Due to space limitations on the offshore platform, chemical diversion acidification was the simplest method for stimulation. The permeabilities of the 13 sub-layers were 470mD, 458mD, 246mD, 213mD, 180mD, 172mD, 106mD, 86mD, 78mD, 60mD, 43mD, 41mD, and 18mD, respectively.

[0119] First step: According to SY / T 6285-2011 Oil and Gas Reservoir Evaluation Method, the main force layer of BZ-3 well is between 50 mD and 500 mD, and it is judged that the well is a medium permeability reservoir.

[0120] Second step: Determine the degree of non-uniformity of the target well. Query the production permeability profile of the target well; count P i (H i , K i ) are P1(11.6 m, 470 mD), P2(23.5 m, 458 mD), P3(11.3 m, 246 mD), P4(11.2 m, 213 mD), P5(12 m, 180 mD), P6(19.3 m, 172 mD), P7(18.5 m, 106 mD), P8(17.1 m, 86 mD), P9(10.8 m, 78 mD), P 10 (8.6 m, 60 mD), P 11 (3.2 m, 43 mD), P 12 (8.3 m, 41 mD), P 13 (3.7 m, 18 mD); divide the permeability into three sections, the first section K min =18 mD to K min +(K max -K min ) / 4=131 mD, the second section 131 mD to (K min +(K max -K min )3 / 4)=357 mD, and the third section 357 mD to 470 mD; calculate M i =ΣH i , and M1=70.2 m, M2=53.8 m, M3=35.1 m, and ΣM=159.1 m.

[0121] Third step: Determine the chemical diverting acidification scheme according to different classification regions of the reservoir. The main force layer of BZ-3 well is a medium permeability reservoir, and the diverting material is selected as viscoelastic surfactant C agent (3-10% viscoelastic surfactant + 1-5% PH regulator + 0.1-1% corrosion inhibitor). M2 / ΣM=53.8 / 159.1=33.8%<60%, M1≥M3. The well is a low-permeability and strong non-homogeneous reservoir. Further determine the selection range of C agent (6-10% viscoelastic surfactant + 1-5% PH regulator + 0.1-1% corrosion inhibitor). Further C agent is 6% bis(2-hydroxyethoxy) oleylamine + 1% gluconolactone + 0.1% imidazoline oleate.

[0122] Example 5, diverting acidification effect analysis

[0123] Example 2, the BZ-1 well was modified to increase liquid by 28%, the water cut was 78% before modification and 68% after modification, i.e. the oil increase was about 86.2%;

[0124] Example 3, the BZ-2 well was modified to increase liquid by 32%, the water cut was 81% before modification and 65% after modification, i.e. the oil increase was about 143%;

[0125] Example 4, the BZ-3 well was modified to increase liquid by 36%, the water cut was 80% before modification and 152% after modification;

[0126] The BZ oilfield is a multi-layer long well section commingling well. Due to the limited platform operation space, acidizing measures have become the main means for long-term production improvement and modification because of the relatively simple construction and small operation space. In the past, the conventional matrix acidizing was mainly used or the conventional diverting acidizing measure was used with the solid-phase forming agent as the diverting agent. In recent years, due to long-term water injection, the water cut increases year by year, and the conventional matrix acidizing or the conventional diverting acidizing measure is mostly used. For most of the operation wells, the measure effect is tracked, and the liquid increase is obtained after the acidizing operation, but the water cut does not decrease, and the water cut of some wells even increases. The 6 well times of the same operation area are counted, including L-1 well, L-2 well, L-3 well, L-4 well, L-5 well and L-6 well.

[0127] L-1 well: the process is matrix acidizing, the liquid increase is 35% after modification, the water cut is 75% before modification and 89% after modification, i.e. the oil increase is 0;

[0128] L-2 well: the process is matrix acidizing, the liquid increase is 40% after modification, the water cut is 80% before modification and 93% after modification, i.e. the oil increase is -51%;

[0129] L-3 well: the process is matrix acidizing, the liquid increase is 50% after modification, the water cut is 78% before modification and 92% after modification, i.e. the oil increase is -45%;

[0130] L-4 well: the process is conventional diverting acidizing, the liquid increase is 16% after modification, the water cut is 80% before modification and 81% after modification, i.e. the oil increase is about 10.2%;

[0131] L-5 well: the process is conventional diverting acidizing, the liquid increase is 23% after modification, the water cut is 78% before modification and 81% after modification, i.e. the oil increase is about 6.2%;

[0132] L-6 well: the process is conventional diverting acidizing, the liquid increase is 18% after modification, the water cut is 73% before modification and 75% after modification, i.e. the oil increase is about 9.3%;

[0133] The six wells after the previous measures show the same law: the liquid volume increases to different degrees after acidification, because the acid dissolves part of the formation minerals or blockages, and increases the seepage passage. The liquid volume of the three wells of matrix acidification increases, but the water cut also increases rapidly, and from the evaluation of the effectiveness of the reconstruction, the three wells can be regarded as ineffective measures. The three wells of conventional diverting acidification have increased liquid volume, and the water cut increases slightly, and the reconstruction of the three wells is effective, but the effect is weak. This shows that for the long-term water injection development of the multi-layer long well section commingled well, diverting acidification is an effective measure to increase production.

[0134] The new technology provided by the application can be called fine diverting acidification technology compared with the same operation block. Compared with the previous acidification reconstruction measures, not only the liquid volume is increased, but also the production water cut is reduced, that is, the oil production is increased. This shows that the measures proposed by the application can be more beneficial to improve the effectiveness of acid liquid operation.

[0135] The above describes the application in detail. For those skilled in the art, the application can be implemented in a wider range under the same parameters, concentrations and conditions without departing from the purpose and scope of the application, and without unnecessary experiments. Although the application gives a special example, it should be understood that the application can be further improved. In summary, according to the principle of the application, the application intends to include any change, use or improvement of the application, including changes made by conventional techniques known in the art, which deviates from the range disclosed in the application.

Claims

1. A multistage method of chemical diversion of acidizing of high and intermediate permeable sandstone reservoirs, characterized in that, The application relates to a method for determining a required diverting material for a target layer of a target well. The method comprises the following steps: If K >= 2000 mD, the target layer is determined as an extra-high permeability reservoir; if 500 mD <= K < 2000 mD, the target layer is determined as a high permeability reservoir; if 50 mD <= K < 500 mD, the target layer is determined as a medium permeability reservoir; K represents the permeability; The method comprises the following steps: The method comprises the following steps: If the target layer is an extra-high permeability reservoir, the diverting material comprises 0.5-1% of a high molecular compound, 0.1-0.2% of a crosslinking agent, 1-5% of a pH regulator, 0-20% of a solid phase forming agent, 0.1-1% of a corrosion inhibitor and the rest of water; the diverting material is further determined according to the relative size between M2 / ΣM and 80% and / or the relative size between M1 and M3; If the target layer is a high permeability reservoir, the diverting material comprises 0.3-0.8% of a high molecular compound, 1-5% of a pH regulator, 0-5% of a bridging agent, 0.1-1% of a corrosion inhibitor and the rest of water; the diverting material is further determined according to the relative size between M2 / ΣM and 70% and / or the relative size between M1 and M3; The statistical layer P, thickness H and permeability K are denoted as P i (H i , K i ), and P i (H i , K i ) Press K i Arranged in ascending order, where i is the numerical number of each layer of the target well production profile; K i Size will permeability into 3 segments, the first segment is (K min ) to (K min +(K max -K min ) / 4), the second segment is (K min +(K max -K min ) / 4) to (K min +(K max -K min )3 / 4), the third segment is (K min +(K max -K min )3 / 4) to K max ; Calculate the total thickness M of each section i =ΣH i , M1, M2, M3 and ΣM are obtained; wherein M1 represents the thickness of the first section of the permeability interval, M2 represents the thickness of the second section of the permeability interval, M3 represents the thickness of the third section of the permeability interval, and ΣM represents the total thickness of the three sections; If the target layer is a medium permeability reservoir, the diverting material comprises 3-10% of a viscoelastic surfactant, 1-5% of a pH regulator, 0.1-1% of a corrosion inhibitor and the rest of water; the diverting material is further determined according to the relative size between M2 / ΣM and 60% and / or the relative size between M1 and M3. The method comprises the following steps: If the target layer is an extra-high permeability reservoir, M2 / ΣM >= 80%, the diverting material comprises 0.5-0.6% of a high molecular compound, 0.1-0.2% of a crosslinking agent, 1-5% of a pH regulator, 0-10% of a solid phase forming agent, 0.1-1% of a corrosion inhibitor and the rest of water; if M2 / ΣM < 80%, M3 >= M1, the diverting material comprises 0.6-0.8% of a high molecular compound, 0.1-0.2% of a crosslinking agent, 1-5% of a pH regulator, 5-15% of a solid phase forming agent, 0.1-1% of a corrosion inhibitor and the rest of water; if M2 / ΣM < 80%, M1 >= M3, the diverting material comprises 0.8-1% of a high molecular compound, 0.1-0.2% of a crosslinking agent, 1-5% of a pH regulator, 10-20% of a solid phase forming agent, 0.1-1% of a corrosion inhibitor and the rest of water; ​ 2. The multizone, high-permeability sandstone reservoir chemical diversion acid fracturing method of claim 1, wherein, ​ ​ If M2 / ∑M≥70%, the diverting material is composed of 0.3-0.5% of the polymer compound, 1-5% of the pH regulator, 0-3% of the bridging agent, 0.1-1% of the corrosion inhibitor, and the rest of water, in terms of mass percentage; if M2 / ∑M<70%, M3≥M1, the diverting material is composed of 0.5-0.6% of the polymer compound, 1-5% of the pH regulator, 2-4% of the bridging agent, 0.1-1% of the corrosion inhibitor, and the rest of water, in terms of mass percentage; if M2 / ∑M<70%, M1≥M3, the diverting material is composed of 0.6-0.8% of the polymer compound, 1-5% of the pH regulator, 3-5% of the bridging agent, 0.1-1% of the corrosion inhibitor, and the rest of water, in terms of mass percentage; If M2 / ∑M≥60%, the diverting material is composed of 3-5% of the viscoelastic surfactant, 1-5% of the pH regulator, 0.1-1% of the corrosion inhibitor, and the rest of water, in terms of mass percentage; if M2 / ∑M<60%, M3≥M1, the diverting material is composed of 5-8% of the viscoelastic surfactant, 1-5% of the pH regulator, 0.1-1% of the corrosion inhibitor, and the rest of water, in terms of mass percentage; if M2 / ∑M<60%, M1≥M3, the diverting material is composed of 6-10% of the viscoelastic surfactant, 1-5% of the pH regulator, 0.1-1% of the corrosion inhibitor, and the rest of water, in terms of mass percentage.

3. The multizone high-permeability sandstone reservoir chemical diversion acid fracturing method of claims 1 or 2, wherein, The polymer compound is selected from one or more of sodium alginate, cationic starch, xanthan gum, cationic guar gum, sodium carboxymethyl cellulose, cationic cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, agar powder, and gelatin; The bridging agent is selected from one or more of distearyl dimethyl ammonium chloride, dicocoalkyl dimethyl ammonium chloride, methylene bis sodium naphthalene sulfonate, diazimidyl alkyl urea, bis (2-hydroxyethoxy) oleyl amine, methylene bis naphthalene sulfonic acid sodium, lauryl amphoteric imidazoline, bis palmityl carboxyethyl hydroxyethyl methyl sulfate ammonium salt, dodecyl bis hydroxyethyl methyl ammonium chloride, tallow alkyl bis hydroxyethyl amine oxide, and bis decyl dimethyl ammonium chloride; The solid phase forming agent is selected from one or more of sodium benzoate, benzoic acid, oil-soluble phenolic resin, epoxy resin powder, calcium carbonate powder, silica powder, bentonite powder, graphite powder, carbon powder, and wood powder; The pH regulator is selected from one or more of ammonium chloride, formaldehyde, sodium bicarbonate, gluconolactone, sodium carbonate, and sodium acetate; The viscoelastic surfactant is selected from one or more of erucamide propyl hydroxy sultaine, cocamidopropyl betaine, oleamide propyl betaine, bis (2-hydroxyethoxy) oleyl amine, sodium fatty alcohol polyoxyethylene ether sulfate, dodecyl dimethyl amine oxide, coconut oil diethanolamide, octyl decyl glucoside, and palm kernel oil diethanolamide; The cross-linking agent is selected from one or more of lactic acid, isopropyl alcohol, triethanolamine, sodium tartrate, acetylacetone, ferric chloride, aluminum chloride, copper chloride, zinc bromide, calcium bromide, barium chloride, calcium chloride, magnesium chloride, ferrous chloride; The corrosion inhibitor is selected from one or more of mercaptan, polyethylene glycol ether, sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate, diethylene triamine, hexamethylene tetramine, butynyl ethanol, butynediol, imidazoline oleate, 4-methyl pyridine, 4-vinyl pyridine, formaldehyde, glyoxal.

4. A multi-zone high permeability sandstone reservoir chemical diversion acidizing staging apparatus, characterized by, Comprise: The hierarchical type determination unit is configured to determine the permeability grade of the target layer of the target well as an extra-high permeability reservoir, a high permeability reservoir or a medium permeability reservoir according to the permeability of the multi-layer sandstone reservoir; The non-uniformity determination unit is configured to determine the non-uniformity of the permeability of the target well according to the production permeability profile of the multi-layer sandstone reservoir; The diverting material determination unit is configured to determine the required diverting material according to the hierarchical type of the permeability of the target well and the non-uniformity of the permeability; The method for determining the permeability grade of the target layer of the target well comprises: If K≥2000 mD, it is determined as an extra-high permeability reservoir; if 500 mD≤K<2000 mD, it is determined as a high permeability reservoir; if 50 mD≤K<500 mD, it is determined as a medium permeability reservoir; Wherein, K is the permeability; The non-uniformity determination of the permeability of the target well comprises: The statistical layer P, thickness H and permeability K are denoted as P i (H i , K i ), and P i (H i , K i ) are arranged in ascending order of K i , where i is the numerical number of each layer of the production profile of the target well. K i Size will permeability into 3 segments, the first segment is (K min ) to (K min +(K max -K min ) / 4), the second segment is (K min +(K max -K min ) / 4) to (K min +(K max -K min )3 / 4), the third segment is (K min +(K max -K min )3 / 4) to K max ; Calculate the total thickness M of each section i =ΣH i , M1, M2, M3 and ΣM are obtained; wherein M1 represents the thickness of the first section of the permeability interval, M2 represents the thickness of the second section of the permeability interval, M3 represents the thickness of the third section of the permeability interval, and ΣM represents the total thickness of the three sections; The determination of the required diverting material comprises: For the extra-high permeability reservoir, the diverting material is composed of 0.5-1% high molecular compound, 0.1-0.2% cross-linking agent, 1-5% pH regulator, 0-20% solid phase forming agent, 0.1-1% corrosion inhibitor and the balance of water; the relative size between M2 / ΣM and 80% and / or the relative size between M1 and M3 are further used to determine the diverting material; For the high permeability reservoir, the diverting material is composed of 0.3-0.8% high molecular compound, 1-5% pH regulator, 0-5% bridging agent, 0.1-1% corrosion inhibitor and the balance of water; the relative size between M2 / ΣM and 70% and / or the relative size between M1 and M3 are further used to determine the diverting material; For the medium permeability reservoir, the diverting material is composed of 3-10% viscoelastic surfactant, 1-5% pH regulator, 0.1-1% corrosion inhibitor and the balance of water; the relative size between M2 / ΣM and 60% and / or the relative size between M1 and M3 are further used to determine the diverting material.

5. A terminal device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, The processor executes the computer program to implement the steps of the method of any one of claims 1-3.

6. A computer-readable storage medium storing a computer program, the computer program comprising instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 5. The computer program is executed by the processor to implement the steps of the method of any one of claims 1-3.

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