Method and system for water control, oil increase and refracturing of high-water-content oil well in low-permeability tight oil reservoir

Abstract

The invention discloses a water-controlling oil-increasing refracturing method and system for a high-water-content oil well in a low-permeability tight oil reservoir, and relates to the technical field of reservoir reformation, and the method comprises the steps that S101, refracturing opportunity charts of high-water-content oil wells in different oil reservoirs are established, the quantitative relation between the stratum pressure and the maximum and minimum crustal stress differences and crustal stress deflection angles of the stratum pressure and the horizontal maximum and minimum crustal stress differences and the quantitative relation between the stratum pressure and the horizontal minimum crustal stress deflection angles are determined, and the stratum pressure is determined; determining whether the high-water-content well can be subjected to refracturing or not; s102, if the high-water-content well can be subjected to refracturing, further determining the dosage of low-viscosity high-strength gel and a composite blocking agent of the high-water-content well according to the water breakthrough characteristics; s103, low-viscosity high-strength gel and a composite plugging agent are pumped and injected at the displacement of 0.8-2.0 m < 3 > / min and are displaced to the reservoir and the deep part of the crack; s104, the high-water-content oil well is closed until the composite plugging agent is cured, and injection is tested for plugging effect verification; and S105, a double-upper-seal fracturing pipe column is put down, and repeated fracturing construction of the high-water-content well is completed. The effective rate of measures can be effectively increased, the risk of water breakthrough after pressure is reduced, and the probability of crack steering is greatly increased.

Description

Technical Field

[0001] The present invention relates to the technical field of reservoir stimulation, and particularly to a method and system for water control and oil production increase by refracturing high water cut oil wells in low permeability and tight oil reservoirs. Background Art

[0002] The Ordos Basin belongs to a typical "three-low oil reservoir", and it is necessary to achieve the purpose of improving the ultimate recovery factor through water injection development. With the extension of the development time, affected by reservoir heterogeneity and well pattern adaptability, the main oilfields such as Ansai, Jing'an, and Jiyuan have entered the medium-high water cut development stage as a whole. Currently, the comprehensive water cut is 62.9%. Statistics on the production status of Triassic directional wells with a length of 3 or less show that there are 15,800 oil wells with a water cut greater than 40%, accounting for 54.1%. Since the main technology for refracturing medium-high water cut wells has not been formed, it is difficult to achieve efficient potential tapping after these wells produce at low yields and low efficiencies, resulting in a gradually decreasing selection space for well measures for oil wells. The lost reserves basically belong to high-quality reserves. How to revitalize the potential of this part of the reserves is of great significance. At present, the refracturing of medium-high water cut oil wells mainly adopts the temporary plugging fracturing process. During the fracturing process, a temporary plugging agent is pumped into the fracture to increase the bottom hole pressure, inhibit the excessive extension of the fracture length, reduce the risk of communicating with the water breakthrough channel by controlling the fracture length, and reduce the water cut after the measure. However, affected by factors such as poor controllability of temporary plugging pressure increase and ineffective plugging of the water breakthrough channel, the measure effect is poor, and the main technology for refracturing medium-high water cut oil wells has not been formed.

[0003] Water control refracturing is an urgent need for efficient reservoir development and is the main technology for creating the 2.0 version of repeated stimulation during the "15th Five-Year Plan". An innovative technical idea of pre-plugging water control fracturing for medium-high water cut wells that effectively plugs the water breakthrough channels of oil wells and forces the refracturing fractures to turn is proposed. Among them, the identification of water breakthrough channels is the prerequisite, low-cost and high-efficiency plugging materials are the basis, and the pre-plugging + fracturing combined operation process is the key. Summary of the Invention

[0004] The purpose of the present invention is to provide a method and system for water control and oil production increase by refracturing high water cut oil wells in low permeability and tight oil reservoirs. By comprehensively considering factors such as the water flooding front, water breakthrough channel characteristics, current stress field, and pressure maintenance level, a refracturing timing chart for medium-high water cut wells in different reservoirs is established. During the pre-refracturing stage, a water control gel and 2 - 3 stages of composite plugging agents with characteristics of high compressive strength, high bonding strength, low cost, low viscosity injection, and low shrinkage rate are respectively pumped in, and multiple high-strength plugging slugs are set at the ends of the old fractures. During the main fracturing stage, the fractures are forced to turn, reducing the water breakthrough risk and mobilizing the lateral remaining oil, so as to achieve the purpose of improving the development effect of the well group. To achieve the above purpose, the present invention provides the following technical solutions:

[0005] The present invention provides a method for water control and oil production increase by refracturing high water cut oil wells in low permeability and tight oil reservoirs, and the method includes the following steps:

[0006] Step S101: Establish a repeated fracturing timing chart for highly water - cut wells in different reservoirs, clarify the quantitative relationships among formation pressure, the maximum and minimum horizontal in - situ stress differences, and the in - situ stress deflection angle, and determine whether the highly water - cut wells can undergo repeated fracturing;

[0007] Step S102: If the highly water - cut wells can undergo repeated fracturing, further determine the dosages of low - viscosity high - strength gel and composite plugging agent for the highly water - cut wells;

[0008] Step S103: Pump the low - viscosity high - strength gel and composite plugging agent at a displacement of 0.8 - 2.0 m 3 / min respectively, and displace them to the deep part of the reservoir and fractures;

[0009] Step S104: Shut in the highly water - cut oil well and wait for the composite plugging agent to solidify, and conduct a trial injection to verify the plugging effect;

[0010] Step S105: Lower a double - upper - packer fracturing string to complete the repeated fracturing operation of the highly water - cut well.

[0011] Furthermore, the method further includes the following steps:

[0012] If the trial injection pressure is more than 3 MPa higher than the pressure when pumping the composite plugging agent, proceed to the next repeated fracturing operation; otherwise, repeat Step S102.

[0013] Furthermore, the quantitative relationships satisfy the following conditions:

[0014] The horizontal in - situ stress difference is positively correlated with the formation pressure. For every 1 MPa increase in formation pressure, the in - situ stress difference increases by 0.2 MPa;

[0015] The horizontal in - situ stress deflection angle is positively correlated with the logarithm of the formation pressure. For every 1 increase in the logarithm value, the deflection angle deflects counter - clockwise by 33.3°. When the deflection angle is greater than 8°, the highly water - cut well can undergo repeated fracturing.

[0016] Furthermore, the dosages of the low - viscosity high - strength gel and composite plugging agent for the highly water - cut wells satisfy the following conditions:

[0017] For fractured water breakthrough, the dosage of the low - viscosity high - strength gel is 150 - 200 cubic meters, and the dosage of the organic - inorganic composite plugging agent is 10 - 20 cubic meters;

[0018] For pore - fractured water breakthrough, the dosage of the low - viscosity high - strength gel is 200 - 300 cubic meters, and the dosage of the organic - inorganic composite plugging agent is 10 - 15 cubic meters.

[0019] Furthermore, the low - viscosity high - strength gel has the following properties:

[0020] It has the characteristics of reverse pressure resistance, injection viscosity ≤ 45 mPas, temperature resistance performance ≥ 80 °C, salt resistance performance ≥ 50000 mg / L, gelation time 4 - 72 h, gelation strength ≥ 50000 mPas, swelling multiple 15 - 100; the plugging validity period is greater than 400 days.

[0021] Furthermore, the low-viscosity and high-strength gel satisfies the following properties:

[0022] Injection viscosity ≤ 70 mPa·s, compressive strength ≥ 25 MPa after curing under temperature and pressure conditions, bonding strength ≥ 5 MPa, volume shrinkage rate ≤ 10%.

[0023] Furthermore, the curing time of the composite plugging agent is 24 - 48 h.

[0024] The present invention also provides a water control and oil production refracturing system for high water cut oil wells in low permeability and tight oil reservoirs, and the system includes:

[0025] The first determination unit is used to establish a refracturing opportunity chart for high water cut wells in different reservoirs, clarify the quantitative relationship between formation pressure, the maximum and minimum horizontal in-situ stress differences, and the in-situ stress deflection angle, and determine whether the high water cut well can carry out refracturing;

[0026] The second determination unit is used to further determine the dosages of the low-viscosity and high-strength gel and the composite plugging agent for the high water cut well if the high water cut well can carry out refracturing;

[0027] The pumping unit is used to pump the low-viscosity and high-strength gel and the composite plugging agent respectively at a displacement of 0.8 - 2.0 m 3 / min and displace them to the deep part of the reservoir and the fracture;

[0028] The verification unit is used to close the high water cut oil well and wait for the composite plugging agent to cure, and conduct a test injection to verify the plugging effect;

[0029] The completion unit is used to lower a double upper-sealing fracturing string to complete the refracturing construction of the high water cut well.

[0030] The technical effects and advantages of the present invention:

[0031] (1) Establish a refracturing opportunity chart for high water cut wells in different reservoirs, quantify the characteristics of the water breakthrough channels, and can effectively increase the effectiveness of the measures;

[0032] (2) Pre-place the low-viscosity and high-strength gel and 2 - 3 stages of composite plugging agent before the main fracturing to achieve comprehensive, deep, and high-strength plugging of the water breakthrough channels such as pores, micro-fractures, and old fractures, and effectively reduce the water breakthrough risk after fracturing;

[0033] (3) Set multiple high-strength plugging slugs at the end of the old fracture to form stress concentration at the fracture end, which can greatly increase the probability of fracture diversion.

[0034] Other features and advantages of the present invention will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the structure particularly pointed out in the specification, claims as well as the drawings. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings may be obtained according to these drawings.

[0036] Figure 1 It is a flow chart of a method for water control and oil production enhancement by refracturing high water cut oil wells in low permeability tight oil reservoirs of the present invention;

[0037] Figure 2 It is a schematic diagram of the correlation between horizontal in-situ stress difference and pore pressure in an embodiment of the present invention;

[0038] Figure 3 It is a schematic diagram of the correlation between the in-situ stress deflection angle and pore pressure in an embodiment of the present invention;

[0039] Figure 4 It is a schematic diagram of a system for water control and oil production enhancement by refracturing high water cut oil wells in low permeability tight oil reservoirs of the present invention;

[0040] Figure 5 It is a schematic diagram of an electronic device of the present invention. Detailed Embodiments

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] To solve the deficiencies of the prior art, the present invention discloses a method for water control and oil production enhancement by refracturing high water cut oil wells in low permeability tight oil reservoirs, including the following steps:

[0043] Step S101, establish a refracturing timing chart for high water cut wells in different oil reservoirs, clarify the quantitative relationships among formation pressure, the maximum and minimum horizontal in-situ stress differences, and the in-situ stress deflection angle, and determine whether the high water cut wells can be refractured;

[0044] Before the refracturing operation, comprehensively consider the current development status of the target well, such as the characteristics of the water breakthrough channel, the current stress field, and the pressure maintenance level, and establish a refracturing timing chart for high water cut wells in different reservoirs. This chart clarifies the quantitative relationships among formation pressure, the difference between the maximum and minimum horizontal in-situ stresses, and the in-situ stress deflection angle under long-term injection-production conditions, that is: the horizontal in-situ stress difference is positively correlated with the formation pressure (pore pressure). For every 1 MPa increase in formation pressure, the stress difference increases by 0.2 MPa (as Figure 2 ); the horizontal in-situ stress deflection angle is positively correlated with the logarithm of the formation pressure (pore pressure). For every 1 increase in the logarithm value, the deflection angle deflects counterclockwise by 33.3° (as Figure 3 ). When the deflection angle is greater than 8°, refracturing can be carried out;

[0045] Step S102: If the high water cut well can be refractured, further clarify the dosage of low-viscosity high-strength gel and composite plugging agent for the high water cut well;

[0046] Quantify the characteristics of the water breakthrough channel through physical and numerical simulation methods, mainly including the water breakthrough type, channel geometry, etc. Pre-place 150 - 300 cubic meters of low-viscosity high-strength gel to block the pores and micro-fractures at the front end of the old fractures deep into the formation, and clarify the dosage of the plugging agent for the high water cut well. For fracture water breakthrough, the dosage of low-viscosity high-strength gel is 150 - 200 cubic meters, and the dosage of organic-inorganic composite plugging agent is 10 - 20 cubic meters. For pore-fracture water breakthrough, the dosage of low-viscosity high-strength gel is 200 - 300 cubic meters, and the dosage of organic-inorganic composite plugging agent is 10 - 15 cubic meters;

[0047] Furthermore, the low-viscosity high-strength gel has the characteristic of reverse pressure bearing, the injection viscosity ≤ 45 mPas, the temperature resistance performance ≥ 80 °C, the salt resistance performance ≥ 50000 mg / L, the gelation time is 4 - 72 h, the gelation strength ≥ 50000 mPas, and the expansion multiple is 15 - 100; the plugging validity period is greater than 400 days;

[0048] Step S103: Pump the low-viscosity high-strength gel and the composite plugging agent at a displacement of 0.8 - 2.0 m 3 / min respectively, and displace them to the deep part of the reservoir and fractures;

[0049] Furthermore, pump 1-3 stages of organic-inorganic composite plugging agents. The composite plugging agent first undergoes a curing reaction between epoxy resin and curing agent under normal temperature conditions to form a cross-linked structure. Nylon fibers are interspersed in the former network, locking cement particles in micro-regions, greatly improving the curing strength. At the same time, through the hydrolysis reaction of MgO, a large amount of water in the network can be consumed, reducing the curing time. The injection viscosity of the plugging agent is ≤70 mPa·s, and after curing under temperature and pressure conditions, the compressive strength is ≥25 MPa, the bonding strength is ≥5 MPa, and the volume shrinkage rate is ≤10%; the single-stage dosage is 8-15 cubic meters. Displace the composite plugging agent to the front end to plug and bond the old fractures formed during the initial fracturing, forming a high-strength plugging slug to ensure that it is difficult to break through when the fracture extends during the refracturing construction, forcing the fracture to turn;

[0050] Step S104: Close the high-water-cut oil well and wait for the composite plugging agent to cure. The curing time is 24-48 h; Conduct a trial injection to verify the plugging effect. If the trial injection pressure is more than 3 MPa higher than the pressure when pumping the composite plugging agent, proceed to the next refracturing construction, otherwise, repeat step S102;

[0051] Step S105: Lower the double-up-packer fracturing string to complete the refracturing construction of the high-water-cut oil well.

[0052] Example:

[0053] The embodiment of the present invention provides a water control and oil production refracturing method for high-water-cut oil wells in Well Y1, including the following steps:

[0054] (1) Well Y1 is a pore-fracture water-seeing well. Currently, the deviation angle of the in-situ stress is 10°, and the pressure maintenance level is 96.5%, meeting the conditions for implementing water control refracturing;

[0055] (2) Optimize the dosage of the composite plugging agent as follows: the dosage of the low-viscosity and high-strength gel is 200 cubic meters, and the dosage of the organic-inorganic composite plugging agent is 10 cubic meters;

[0056] (3) Pull out the original well string, wash the well, and lower the fracturing string. The structure and position of the fracturing string (from bottom to top) are: Φ28 mm (straight nozzle (2545.0 m) + 2 7 / 8" tool tubing for 10 roots + K344-114 packer (2455.0 m) + 2 7 / 8" tubing nipple (1 m) + K344-114 packer (2454.0 m) + KDB114-60 hydraulic anchor (upper pack) + 2 7 / 8" tool tubing to the wellhead.

[0057] (4) Use a fracturing truck to pump the composite plugging agent at a displacement of 2.0 m 3 / min, and inject 200 m of the low-viscosity and high-strength gel and 20 m of crosslinked guar gum in sequence 3 in turn.3 , the organic-inorganic composite plugging agent is 10.0 m 3 , the displacement fluid is 60 m 3 .

[0058] (5) Shut in the well and wait for coagulation for 48 h;

[0059] (6) Conduct a verification injection to verify the plugging effect. The pressure increases by 3 - 5 MPa compared with the stage of pumping the plugging agent, and the plugging effect is good;

[0060] (7) Repeated fracturing construction, add 40 m of quartz sand with a mesh size of 20 - 40 3 , the displacement is 2.8 m 3 / min, the sand ratio is 32.0%, the sand-carrying fluid is 125 m 3 , the displacement fluid is 8.2 m 3 .

[0061] (8) After the repeated fracturing is completed, shut in the well for 30 min, immediately flow back from the tubing, control the flow back with a nozzle of 4 - 12 mm, and accurately measure the discharged liquid volume. After the flow back is completed, immediately backwash (the displacement is greater than 600 L / min) until there are no sand grains at the wellhead, use the swabbing method to induce flow and drain the liquid, and lower the swabbing string to produce the well.

[0062] Based on the same inventive concept of the present invention, the present invention also provides a water control and oil production repeated fracturing system for high water cut oil wells in low permeability tight oil reservoirs. The system includes: a first determination unit 201, which is used to establish a repeated fracturing opportunity chart for high water cut wells in different oil reservoirs, clarify the quantitative relationship between formation pressure, the maximum and minimum horizontal in-situ stress differences, and the in-situ stress deflection angle, and determine whether the high water cut well can carry out repeated fracturing; a second determination unit 202, which is used to further determine the dosage of low-viscosity high-strength gel and composite plugging agent for the high water cut well if the high water cut well can carry out repeated fracturing; a pumping unit 203, which is used to pump the low-viscosity high-strength gel and composite plugging agent at a displacement of 0.8 - 2.0 m 3 / min respectively and displace them to the deep part of the reservoir and fractures; a verification unit 204, which is used to close the high water cut oil well and wait for the composite plugging agent to solidify, and conduct a verification injection to verify the plugging effect; a completion unit 205, which is used to lower a double upper-sealing fracturing string to complete the repeated fracturing construction of the high water cut well.

[0063] Based on the same inventive concept, the present invention also provides an electronic device. As Figure 5 shown, the electronic device includes at least one processor 301, at least one communication interface 302, at least one memory 303, and at least one communication bus 304; wherein, the processor 301, the communication interface 302, and the memory 303 communicate with each other through the communication bus 304;

[0064] The memory 303 stores a computer program;

[0065] The processor 301 is configured to implement the water control and oil production enhancement repeated fracturing method for high water cut oil wells in low permeability tight oil reservoirs when executing the program stored in the memory 303.

[0066] Optionally, the communication interface can be the interface of a communication module, such as the interface of a GSM module; the processor may be a central processing unit (CPU), or a specific application integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention. The memory may include high-speed RAM memory and may also include non-volatile memory, such as at least one disk memory. Among them, the memory stores a program, and the processor calls the program stored in the memory to execute some or all of the above method embodiments.

[0067] Based on the same inventive concept, an embodiment of the present application further provides a computer-readable storage medium storing a computer program, which when run, implements some or all of the above method embodiments. Optionally, the storage medium can be a non-transitory computer-readable storage medium. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0068] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for water control and oil production increase by refracturing of high water cut oil wells in low permeability tight oil reservoirs, characterized in that, The method includes the following steps: Step S101: Establish a repeat fracturing timing chart for high water cut wells in different reservoirs, clarify the quantitative relationships among formation pressure, the difference between the maximum and minimum horizontal in-situ stresses, and the in-situ stress deflection angle, and determine whether the high water cut wells can be subjected to repeat fracturing; Step S102: If the high water cut wells can be subjected to repeat fracturing, further determine the dosages of low-viscosity high-strength gel and composite plugging agent for the high water cut wells according to the water breakthrough characteristics; Step S103: Pump low-viscosity high-strength gel and composite plugging agent at a displacement of 0.8 - 2.0 m 3 / min respectively, and displace them to the deep part of the reservoir and fractures; Step S104: Shut in the high water cut oil well and wait for the composite plugging agent to solidify, and conduct a trial injection to verify the plugging effect; Step S105: Lower a double upper packer fracturing string to complete the repeat fracturing operation of the high water cut well.

2. A method for water control and oil production increase by refracturing high water cut oil wells in low permeability tight oil reservoirs according to claim 1, characterized in that, The method further includes the following steps: If the trial injection pressure is more than 3 MPa higher than the pressure when pumping the composite plugging agent, proceed to the next repeat fracturing operation; otherwise, repeat Step S102.

3. A method for water control and oil production increase by refracturing of high water cut oil wells in low permeability tight oil reservoirs according to claim 1, characterized in that The quantitative relationships satisfy the following conditions: The horizontal in-situ stress difference is positively correlated with the formation pressure. For every 1 MPa increase in the formation pressure, the in-situ stress difference increases by 0.2 MPa; The horizontal in-situ stress deflection angle is positively correlated with the logarithm of the formation pressure. For every 1 increase in the logarithm value, the deflection angle deflects counterclockwise by 33.3°. When the deflection angle is greater than 8°, the high water cut wells can be subjected to repeat fracturing.

4. A method for water control and oil production increase by repeated fracturing of high water cut oil wells in low permeability tight oil reservoirs according to claim 1, characterized in that, The dosages of the low-viscosity high-strength gel and composite plugging agent for the high water cut wells satisfy the following conditions: For fracture water breakthrough, the dosage of the low-viscosity high-strength gel is 150 - 200 m³, and the dosage of the organic-inorganic composite plugging agent is 10 - 20 m³; For pore-fracture water breakthrough, the dosage of the low-viscosity high-strength gel is 200 - 300 m³, and the dosage of the organic-inorganic composite plugging agent is 10 - 15 m³.

5. A method for water control and oil production enhancement by repeated fracturing of high water cut oil wells in low permeability tight oil reservoirs according to claim 4, characterized in that, The low-viscosity high-strength gel satisfies the following properties: It has reverse pressure-bearing characteristics, the injection viscosity ≤ 45 mPas, the temperature resistance performance ≥ 80 °C, the salt resistance performance ≥ 50000 mg / L, the gelation time is 4 - 72 h, the gelation strength ≥ 50000 mPas, and the expansion multiple is 15 - 100; the plugging validity period is greater than 400 days.

6. A method for water control and oil production increase by refracturing of high water cut oil wells in low permeability tight oil reservoirs according to claim 4, characterized in that, The organic-inorganic composite plugging satisfies the following properties: The injection viscosity ≤ 70 mPa·s, the compressive strength after curing under temperature and pressure conditions ≥ 25 MPa, the bonding strength ≥ 5 MPa, and the volume shrinkage rate ≤ 10%.

7. A method for water control and oil production enhancement by refracturing of high water cut oil wells in low permeability tight oil reservoirs according to claim 1, characterized in that, The curing time of the composite plugging agent is 24 - 48 h.

8. A water control and oil production increasing refracturing system for high water cut oil wells in low permeability tight oil reservoirs, characterized in that, The system includes: A first determination unit, used to establish a repeat fracturing timing chart for high water cut wells in different reservoirs, clarify the quantitative relationships among formation pressure, the difference between the maximum and minimum horizontal in-situ stresses, and the in-situ stress deflection angle, and determine whether the high water cut wells can be subjected to repeat fracturing; A second determination unit, used to further determine the dosages of the low-viscosity high-strength gel and composite plugging agent for the high water cut wells if the high water cut wells can be subjected to repeat fracturing; Pumping unit, used to pump low-viscosity high-strength gel and composite plugging agent respectively at a displacement of 0.8 - 2.0 m 3 / min and displace them to the deep part of the reservoir and fractures; A verification unit, used to shut in the high water cut oil well and wait for the composite plugging agent to solidify, and conduct a trial injection to verify the plugging effect; A completion unit, used to lower a double upper packer fracturing string to complete the repeat fracturing operation of the high water cut well.

9. An electronic device, characterized in that, It includes a processor, a communication interface, a memory, and a communication bus. Among them, the processor, the communication interface, and the memory complete mutual communication through the communication bus; The memory stores a computer program; A processor, when executing a program stored in a memory, implements the method for water control and oil production increase by repeated fracturing of high-water-cut oil wells in a low-permeability tight oil reservoir according to any one of claims 1-7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is run, it executes the method for water control and oil production increase by repeated fracturing of high-water-cut oil wells in a low-permeability tight oil reservoir according to any one of claims 1-7.

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