Intelligent injection-production collaborative development system and method for late-stage water flooding of oil reservoir

Abstract

The present invention relates to the field of oil reservoir development, and provides an intelligent injection-production collaborative development system and method for late-stage water-flooding of an oil reservoir. The intelligent injection-production collaborative development system for late-stage water-flooding of an oil reservoir comprises: a tubing string type determination module, used to determine, on the basis of pre-acquired tubing string constraint information, types of water injection tubing strings to be installed in water injection wells and types of oil production tubing strings to be installed in oil production wells; a production data acquisition module, used to acquire working data of the water injection tubing strings installed in the water injection wells and working data of the oil production tubing strings installed in the oil production wells, and, on the basis of the working data, obtain water injection data of the water injection wells and oil production data of the oil production wells; a dynamic analysis module, used to dynamically analyze the water injection data of the water injection wells and the oil production data of the oil production wells, so as to determine an optimal water injection scheme; and an adjustment module, used to adjust water injection amounts of the water injection wells on the basis of the optimal water injection scheme, so as to obtain an optimal oil production amount of a target region.

Description

Intelligent injection-production collaborative development system and method for late-stage water-flooding reservoirs Technical Field

[0001] The present invention relates to the field of oil reservoir development, and in particular to a late intelligent injection-production collaborative development system for a water drive oil reservoir and a late intelligent injection-production collaborative development method for a water drive oil reservoir. Background Art

[0002] With the continued development of oilfields, they have entered a phase of high to ultra-high water cuts, with a comprehensive water cut approaching 90%. Water cuts are rising particularly in older development areas. Currently, water flooding faces complex injection-production relationships, uneven reservoir utilization, and intensified interlayer conflicts. These issues lead to severe ineffective water circulation, rapid increases in water cut, and low reserve utilization.

[0003] Summary of the Invention

[0004] In order to solve the above-mentioned technical defects, the present invention provides a system and method for the coordinated development of intelligent injection and production in the late stage of water-drive oil reservoirs. The system is designed to install suitable water injection strings or oil production strings for various complex development wells, and to perform real-time optimization based on water injection data and oil production data to generate an optimal water injection plan, thereby achieving the purpose of increasing oil production and controlling water.

[0005] The first aspect of the present invention provides a water flooding reservoir late stage intelligent injection-production collaborative development system, comprising:

[0006] The tubing type confirmation module is used to determine the type of water injection tubing to be installed in each water injection well and the type of oil production tubing to be installed in each oil production well based on the tubing constraint information obtained in advance;

[0007] A production data acquisition module is used to obtain the working data of the water injection string installed in each water injection well and the working data of the oil production string installed in each oil production well, and obtain the water injection data of each water injection well and the oil production data of each oil production well based on the working data;

[0008] Dynamic analysis module, used to dynamically analyze the water injection data of each water injection well and the oil production data of each oil production well to determine the optimal water injection plan;

[0009] The adjustment module is used to adjust the water injection rate of each water injection well according to the optimal water injection plan to obtain the optimal oil production in the target area.

[0010] In an embodiment of the present invention, the system further includes:

[0011] The tubing constraint information determination module is used to obtain well location data in the target area, obtain multiple water injection wells and oil production wells in the target area, and obtain geological data of each water injection well and each oil production well, and obtain the tubing constraint information of each water injection well and the tubing constraint information of each oil production well based on the geological data.

[0012] In an embodiment of the present invention, the string constraint information includes: casing change constraint information and well inclination constraint information;

[0013] The tubing string confirmation module is specifically used to obtain the casing change value of the casing change constraint information of the water injection well and the inclination value of the inclination constraint information in the well;

[0014] If it is determined that the casing change value of the water injection well exceeds the first preset value, it is determined that the water injection well needs to be installed with a casing change well water injection string;

[0015] If it is determined that the inclination value of the water injection well exceeds the second preset value, it is determined that the water injection well needs to be installed with a built-in cable water injection string.

[0016] In an embodiment of the present invention, the tubing string confirmation module is specifically used to obtain the casing change value of the casing change constraint information of the oil production well;

[0017] If it is determined that the casing change value of the casing change constraint information of the oil production well exceeds the third preset value, it is determined that the oil production well needs to be installed with a sidetrack production string.

[0018] In an embodiment of the present invention, the casing-change well water injection string includes an anti-locking mechanism, which is installed in the casing-change well water injection string. When the casing-change well water injection string enters the water injection well, the anti-locking mechanism is used to lock the backwash valve.

[0019] In an embodiment of the present invention, the casing-changeable well water injection string further includes a large expansion ratio rubber cylinder, and the expansion ratio of the large expansion ratio rubber cylinder is greater than 1.4.

[0020] In an embodiment of the present invention, the built-in cable water injection string includes a wireless docking power supply communication device, and the wireless docking power supply communication device includes a male connector and a female connector;

[0021] The male connector is provided with a transmitting circuit and a transmitting coil, and the female connector is provided with a receiving circuit and a receiving coil;

[0022] The female connector is installed above the tubing string in the well. Driven by the downhole cable, the male connector is lowered into the tubing string and inserted into the female connector to form an electromagnetic coupling loop.

[0023] In an embodiment of the present invention, the sidetracking well production string includes a cable passing device, and the cable passing device includes an outer connector, an upper connector, and a lower connector;

[0024] The upper end of the outer connector is connected to the upper joint, and the lower end of the outer connector is connected to the lower connector;

[0025] A cable channel is provided in the upper connector, and the cable channel is communicated with the lower connector;

[0026] The lower joint is also connected to the pipe string;

[0027] The cable passes through the cable channel of the upper joint and the lower joint in sequence and enters the interior of the tubing string of the tubing string.

[0028] In an embodiment of the present invention, the dynamic analysis module includes:

[0029] The injection rate optimization unit is used to optimize the injection rate of each water injection well according to the water injection data of each water injection well and the oil production data of each oil production well, and obtain the optimized injection rate of each layer of the water injection well;

[0030] An injection-production relationship confirmation unit is used to determine the connection relationship between each water injection well and each oil production well based on the water injection data of each water injection well and the oil production data of each oil production well;

[0031] The optimal water injection plan generation unit is used to determine the optimal water injection plan based on the optimized injection volume of each layer of each water injection well and the connectivity relationship between each water injection well and each oil production well. The optimal water injection plan includes the total water injection volume and the producer flow rate of each injection layer of the water injection well.

[0032] In an embodiment of the present invention, the adjustment module includes a water injection calibrator, which is used to adjust the water injection volume of each injection layer of the water injection well according to the optimal water injection plan.

[0033] In an embodiment of the present invention, the water injection calibrator includes a controller, an actuator, and a flow meter;

[0034] The controller is used to generate water injection amount adjustment instructions for each water injection layer according to the optimal water injection plan;

[0035] The actuator is used to adjust the water injection amount of each water injection layer according to the water injection amount adjustment instruction of each water injection layer;

[0036] The flow meter is used to measure the water injection volume input by the water injection calibrator.

[0037] In an embodiment of the present invention, the water injection calibrator is also used to calibrate the water injection volume of each water injection layer;

[0038] The controller of the water injection calibrator is also used to obtain the total water injection volume of the water injection well and the flow rate of the production device of each water injection layer of the well according to the optimal water injection plan.

[0039] The controller is used to determine whether the total water injection volume of the water injection well is equal to the sum of the flow rates of the distributors of each water injection layer of the well;

[0040] If not, a water injection calibration instruction is generated;

[0041] The actuator is further used to calibrate the flow rate of the distributor of each water injection layer according to the water injection calibration instruction.

[0042] A second aspect of the present invention provides a method for intelligent injection-production collaborative development of a water-flooding reservoir in the later stage, comprising:

[0043] Determining the type of water injection string to be installed in each water injection well based on the pre-acquired string constraint information, and determining the type of oil production string to be installed in each oil production well based on the pre-acquired string constraint information;

[0044] Obtaining working data of the water injection string installed in each water injection well and working data of the oil production string installed in each oil production well, and obtaining water injection data of each water injection well and oil production data of each oil production well based on the working data;

[0045] Conduct dynamic analysis on the water injection data of each water injection well and the oil production data of each oil production well to determine the optimal water injection plan;

[0046] The water injection rate of each injection well is adjusted according to the optimal water injection plan to obtain the optimal oil production in the target area.

[0047] In an embodiment of the present invention, the method further includes:

[0048] Acquire well location data within the target area, and obtain multiple water injection wells and oil production wells within the target area;

[0049] The geological data of each water injection well and each oil production well are obtained, and the tubing string constraint information of each water injection well and the tubing string constraint information of each oil production well are obtained based on the geological data.

[0050] In an embodiment of the present invention, the string constraint information includes: casing change constraint information and well inclination constraint information;

[0051] The method of determining the type of water injection string to be installed in each water injection well based on the pre-acquired string constraint information includes:

[0052] Obtaining the casing change value of the casing change constraint information of the water injection well and the inclination value of the inclination constraint information in the well;

[0053] If it is determined that the casing change value of the water injection well exceeds the first preset value, it is determined that the water injection well needs to be installed with a casing change well water injection string;

[0054] If it is determined that the inclination value of the water injection well exceeds the second preset value, it is determined that the water injection well needs to be installed with a built-in cable water injection string.

[0055] In an embodiment of the present invention, the method of determining the type of production tubing to be installed in each oil well based on pre-acquired tubing constraint information includes:

[0056] Obtaining the casing change value of casing change constraint information of the oil production well;

[0057] If it is determined that the casing change value of the casing change constraint information of the oil production well exceeds the third preset value, it is determined that the oil production well needs to be installed with a sidetrack production string.

[0058] In the embodiment of the present invention, the dynamic analysis of the water injection data of each water injection well and the oil production data of each oil production well to determine the optimal water injection scheme includes:

[0059] According to the water injection data of each water injection well and the oil production data of each oil production well, the injection rate of each water injection well is optimized to obtain the optimized injection rate of each injection well layer;

[0060] Determine the connectivity between each water injection well and each oil production well based on the water injection data of each water injection well and the oil production data of each oil production well;

[0061] The optimal water injection plan is determined based on the optimized injection volume of each injection well and the connectivity between each injection well and each oil production well. The optimal water injection plan includes the total water injection volume and the flow rate of the producer of each injection layer of the injection well.

[0062] In an embodiment of the present invention, the method further includes:

[0063] The water injection rate of each injection well is adjusted according to the optimal water injection plan through the water injection calibrator to obtain the optimal oil production in the target area.

[0064] A third aspect of the present invention provides a computer device, comprising:

[0065] Memory;

[0066] processor; and

[0067] computer programs;

[0068] The computer program is stored in a memory and is configured to be executed by a processor to implement the above-mentioned method for intelligent injection-production collaborative development in the late stage of a water-flooding oil reservoir.

[0069] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to implement the above-mentioned method for intelligent injection-production collaborative development of a water-flooding reservoir in the late stage.

[0070] For various complex development wells, suitable water injection strings or oil production strings are installed. According to the water injection data and oil production data, real-time optimization is carried out to generate the optimal water injection plan to achieve the purpose of increasing oil production and controlling water.

[0071] Other features and advantages of the technical solution of the present invention will be described in detail in the specific implementation section below. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0073] 1 is a schematic structural diagram of a water flooding reservoir late intelligent injection-production collaborative development system according to an embodiment of the present invention;

[0074] FIG2 is a schematic structural diagram of a casing-change well water injection string provided in an embodiment of the present invention;

[0075] 3 is a schematic cross-sectional view of an anti-locking mechanism when a cable packer is placed into a well, provided by an embodiment of the present invention;

[0076] 4 is a schematic cross-sectional view of an anti-locking mechanism during setting of a cable packer provided by an embodiment of the present invention;

[0077] 5 is a schematic cross-sectional view of the anti-locking structure during backwashing of a cable packer provided by an embodiment of the present invention;

[0078] FIG6 is a schematic structural diagram of a built-in cable water injection string provided in an embodiment of the present invention;

[0079] 7 is a schematic structural diagram of a wireless docking power communication device provided in an embodiment of the present invention;

[0080] FIG8 is a schematic diagram of the electromagnetic coupling principle of a wireless docking power communication device provided by an embodiment of the present invention;

[0081] FIG9 is a schematic structural diagram of a side-drilling well production string provided by an embodiment of the present invention;

[0082] 10 is a schematic structural diagram of a cable crossing device according to an embodiment of the present invention;

[0083] FIG11 is a cross-sectional view of a cable crossing device according to an embodiment of the present invention;

[0084] FIG12 is a flow chart of a method for intelligent injection-production collaborative development of a water drive reservoir in the late stage provided by an embodiment of the present invention.

[0085] Explanation of the reference numerals 1-pressure hole, 2-pressure cap, 3-fixed body, 4-pin, 5-anti-locking mechanism, 6-center tube, 7-backwash seat, 8-reserved hole, 9-upper joint, 10-anti-rotation pin, 11-external connector, 12-lower joint. DETAILED DESCRIPTION

[0086] To make the technical solutions and advantages of the embodiments of the present invention more clearly understood, exemplary embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be noted that the embodiments described are only a portion of the embodiments of the present invention, and are not an exhaustive list of all embodiments. It should be noted that the embodiments of the present invention and the features thereof may be combined with each other unless they conflict.

[0087] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0088] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0089] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed or removable connections, or integration; mechanical or electrical connections, or communication; direct or indirect connections through an intermediary; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0090] During the development of this invention, the inventors discovered that with the continued advancement of oilfield development, the field has entered a phase of high to ultra-high water cuts, with a comprehensive water cut approaching 90%. In particular, the water cut in older development areas continues to rise. Current water flooding development faces complex injection-production relationships, uneven reservoir utilization, and intensified interlayer conflicts. These issues lead to severe ineffective water circulation, rapid increases in water cut, and low reserve utilization.

[0091] In response to the above problems, an embodiment of the present invention provides a water-drive reservoir late-stage intelligent injection and production collaborative development system, comprising: a tubing type confirmation module for determining the type of water injection tubing to be installed in each water injection well and the type of oil production tubing to be installed in each oil production well based on pre-acquired tubing constraint information; a production data acquisition module for acquiring the working data of the water injection tubing installed in each water injection well and the working data of the oil production tubing installed in each oil production well, and obtaining the water injection data of each water injection well and the oil production data of each oil production well based on the working data; a dynamic analysis module for dynamically analyzing the water injection data of each water injection well and the oil production data of each oil production well to determine the optimal water injection scheme; and an adjustment module for adjusting the water injection volume of each water injection well according to the optimal water injection scheme to obtain the optimal oil production in the target area. The water-drive reservoir late-stage intelligent injection and production collaborative development system is designed to install water injection tubing or oil production tubing suitable for various complex development wells, and performs real-time optimization based on the water injection data and oil production data to generate the optimal water injection scheme to achieve the purpose of increasing oil production and controlling water.

[0092] Figure 1 is a schematic diagram of the structure of a water flooding reservoir late stage intelligent injection and production collaborative development system provided by an embodiment of the present invention. As shown in Figure 1, this embodiment provides a water flooding reservoir late stage intelligent injection and production collaborative development system, including:

[0093] The tubing type confirmation module is used to determine the type of water injection tubing to be installed in each water injection well and the type of oil production tubing to be installed in each oil production well based on the tubing constraint information obtained in advance;

[0094] A production data acquisition module is used to obtain the working data of the water injection string installed in each water injection well and the working data of the oil production string installed in each oil production well, and obtain the water injection data of each water injection well and the oil production data of each oil production well based on the working data;

[0095] Dynamic analysis module, used to dynamically analyze the water injection data of each water injection well and the oil production data of each oil production well to determine the optimal water injection plan;

[0096] The adjustment module is used to adjust the water injection rate of each water injection well according to the optimal water injection plan to obtain the optimal oil production in the target area.

[0097] The present invention uses different types of water injection strings or oil production strings to carry out water drive oil reservoir development activities in the target area according to different complex formation conditions, which can achieve the maximum oil production result; the water injection data and oil production data obtained from the development of different types of water injection strings or oil production strings selected according to the complex formation conditions are dynamically analyzed to obtain the optimal water injection plan and the optimal ratio of the injection-production relationship, thereby achieving the purpose of stabilizing oil and controlling water in the water drive oil reservoir.

[0098] In this embodiment, the system further includes:

[0099] The tubing constraint information determination module is used to obtain well location data in the target area, obtain multiple water injection wells and oil production wells in the target area, and obtain geological data of each water injection well and each oil production well, and obtain the tubing constraint information of each water injection well and the tubing constraint information of each oil production well based on the geological data.

[0100] In this embodiment, the string constraint information includes: casing change constraint information and well inclination constraint information;

[0101] The tubing string confirmation module is specifically used to obtain the casing change value of the casing change constraint information of the water injection well and the inclination value of the inclination constraint information in the well;

[0102] If it is determined that the casing change value of the water injection well exceeds the first preset value, it is determined that the water injection well needs to be installed with a casing change well water injection string;

[0103] If it is determined that the inclination value of the water injection well exceeds the second preset value, it is determined that the water injection well needs to be installed with a built-in cable water injection string.

[0104] In mature oilfields, the probability of casing changes in the later stages of a wellbore is high, making conventional injection and production technologies impossible to implement on-site, impacting the overall deployment, production management, and performance analysis of the block. The core tool for the casing-change well injection string is the casing-change well cable packer. This solves the problems of large rubber seal space and easy backwash valve failure. To address the large seal space, a high-expansion-ratio rubber packer was used. To address the backwash valve failure problem, an anti-lock mechanism was added. When the tool is lowered into the wellbore, the backwash valve is locked and cannot move freely, preventing damage to the backwash valve seal during entry. During setting, the pin is sheared by pressure, releasing the locking function of the lock block, allowing the backwash valve to move freely and closing the backwash valve by relying on tubing pressure. Later, when backwashing the well, the casing pressure exceeds the tubing pressure, opening the backwash valve to achieve well washing.

[0105] Further, FIG2 is a schematic structural diagram of a casing-changing well water injection string provided in an embodiment of the present invention;

[0106] 3 is a schematic cross-sectional view of an anti-locking mechanism when a cable packer is placed into a well, provided by an embodiment of the present invention;

[0107] 4 is a schematic cross-sectional view of an anti-locking mechanism during setting of a cable packer provided by an embodiment of the present invention;

[0108] Figure 5 is a schematic cross-sectional structure diagram of the anti-locking during backwashing of the cable packer provided by an embodiment of the present invention; as shown in Figures 2-5: the cable packer of the casing-change well water injection string includes an anti-locking mechanism, and the anti-locking mechanism 5 is installed on the central tube 6 of the cable packer. When the casing-change well water injection string enters the water injection well, the anti-locking mechanism is used to lock the backwash valve.

[0109] When entering the well through the cable packer:

[0110] The anti-locking mechanism 5 fixes the fixed body 3 and the central tube 6 together, the backwash seat 7 is fixed, and the backwash valve is in a closed state.

[0111] When the cable packer is set:

[0112] Pressure is applied to the cable packer's central tube through pressure hole 1 and applied to pressure cap 2. When the pressure reaches a certain value, pin 4 is sheared off, and pressure cap 2 moves downward (rightward). The recessed area is located above anti-lock mechanism 5, which no longer restricts it. Fixed body 3 and central tube 6 can slide freely, and the locking effect of the backwash valve disappears.

[0113] When backwashing through the cable packer:

[0114] After the cable packer is set, the rubber seal is compressed and sealed on the casing. The oil casing annulus pressure enters through the reserved hole 8 and pushes the backwash valve component to move upward, as shown by the arrow.

[0115] In this embodiment, the cable packer of the casing-change well water injection string further includes a large expansion ratio rubber cylinder, the expansion ratio of which is greater than 1.4 to improve the sealing performance of the large expansion ratio rubber cylinder.

[0116] Conventional water injection pipes usually use the method of bundling cables outside the pipe, and a cable protector is used to fix each coupling to fix and protect the cable. However, it does not have an advantage in terms of pipe string cost, and on-site construction is relatively cumbersome. At the same time, for wells with large well inclination, the probability of cables being stuck by bundling outside the pipe is relatively high. The existing technical solution to the above problem is to use a wet joint inside the pipe. The wet joint usually consists of two parts, a male head and a female head. Its working principle is that the wet joint male head is inserted into the wet joint female head, and the conductive electrodes are in hard contact to achieve electrical connection and data communication. Sealing is usually achieved by filling insulating media or mechanical seals. There are the following problems: 1) The use of filling insulating media for sealing cannot achieve multiple plug-in and unplugging. When the insulating medium is contaminated by well fluid, it will cause insulation failure. 2) Mechanical seal sealing method, when the male head and the female head move relative to each other, it will cause insulation failure. Problems with wet joints.

[0117] The present invention proposes a built-in cable water injection string, which uses a cable-through-the-pipe method. First, an intelligent water injection process string is lowered. The upper end of the string is a wireless docking power supply and communication device, which is connected to the cable dispenser below via a cable passing through a cable packer. The wireless docking power supply and communication device mainly consists of a male connector and a female connector. The female connector is connected to the string in series, and the male connector is connected to the upper end cable. The cable is lowered into the well. The two use the principle of electromagnetic coupling. The male connector includes a transmitting circuit and a transmitting coil, and the female connector includes a receiving circuit and a receiving coil. The wireless docking power supply and communication device converts direct current into high-frequency electricity with a specific frequency through a high-frequency inverter circuit and transmits it to the transmitting coil. If the power supply frequency is the same as the transmitting circuit frequency and the receiving circuit frequency, the impedance in the transmitting circuit and the receiving circuit is minimized, the system is in a resonant state, and the receiving coil induces alternating current, which is transmitted to the load after rectification and filtering. It can realize data communication between underground and ground, and can also realize power supply for the intelligent cable dispenser underground.

[0118] FIG6 is a schematic diagram of the structure of a built-in cable water injection column provided in an embodiment of the present invention, and FIG7 is a schematic diagram of the structure of a wireless docking power supply communication device provided in an embodiment of the present invention. As shown in FIG6 and FIG7 : In this embodiment, the built-in cable water injection column includes a wireless docking power supply communication device, and the wireless docking power supply communication device includes a male connector and a female connector;

[0119] The male connector is provided with a transmitting circuit and a transmitting coil, and the female connector is provided with a receiving circuit and a receiving coil;

[0120] The female connector is installed above the tubing string in the well. Driven by the downhole cable, the male connector is lowered into the tubing string and inserted into the female connector to form an electromagnetic coupling loop.

[0121] Figure 8 is a schematic diagram of the electromagnetic coupling principle of a wireless docking power communication device provided by an embodiment of the present invention. As shown in Figure 8, the transmitting circuit includes an AC input circuit, a rectifier circuit, a high-frequency inverter circuit, and a first compensation structure circuit. The downhole cable serves as the AC input, which is then rectified and inverted. The receiving circuit includes a second compensation structure circuit, a rectifier and filter circuit, and a load.

[0122] In this embodiment, the tubing string confirmation module is specifically used to obtain the casing change value of the casing change constraint information of the oil production well;

[0123] If it is determined that the casing change value of the casing change constraint information of the oil production well exceeds the third preset value, it is determined that the oil production well needs to be installed with a sidetrack production string.

[0124] In the later stage of old oil fields, small-diameter side drilling is usually used for development of wells with more serious casing deformation. Due to the limited space size of side-drilled wells, the conventional intelligent oil production technology that uses cables bundled outside the pipe is prone to cable breakage. To address this problem, this embodiment provides a side-drilled well production string. The side-drilled well production string uses a cable crossing device to introduce the cable from outside the pipe into the pipe, so as to realize power supply and communication for the small-diameter production device in the side-drilled section. The cable crossing device is lowered into the vertical well section, which can realize the cable passing from inside the pipe to outside the pipe. The diameter of the upper joint and the lower joint can be rotated freely to ensure that the cable is not broken when the oil pipe is buckled. At the same time, it has a sealing effect, and can subsequently realize processes such as in-pipe pressure and packer sealing.

[0125] FIG9 is a schematic structural diagram of a side-drilling production tubing string provided in an embodiment of the present invention, FIG10 is a schematic structural diagram of a cable crossing device provided in an embodiment of the present invention, and FIG11 is a cross-sectional view of a cable crossing device provided in an embodiment of the present invention. As shown in FIG9-11 , the side-drilling production tubing string includes a cable crossing device, which includes an outer connector 11, and a rotatable upper joint 9 and a lower joint 12;

[0126] The upper end of the external connector 11 is connected to the upper connector 9, and the lower end of the external connector 11 is connected to the lower connector 12;

[0127] The upper joint 9 is provided with a cable channel, which is connected to the lower joint 12; the lower joint 12 is also connected to the pipe string;

[0128] The cable passes through the cable channel of the upper connector 9 and the lower connector 12 in sequence and enters the interior of the tubular string of the tubular string.

[0129] The upper connector 9 is threadedly connected to the outer connector 11. After the threads are tightened, the outer connector 11 and the lower connector 12 are fixed together using a step. The upper connector 9 and the outer connector 11 are fixed together using a flat threaded connection and an anti-rotation pin 10. The upper portion of the upper connector 9 features a female oil pipe connector, which connects to the male oil pipe connector on the upper portion. The upper hole of the upper connector 9 is where the cable passes through. After the cable passes through, a dedicated Swagelok fitting is used for securing and sealing. The lower end of the lower connector 12 features a male oil pipe connector, which connects to the female oil pipe connector on the next oil pipe.

[0130] Furthermore, the minimum inner diameter of the lower end of the outer connector 11 is smaller than the maximum outer diameter of the upper end of the lower connector 12, so that the weight of the lower end of the pipe string is borne on the step between the two.

[0131] A cable channel is provided in the upper joint 9, and the cable channel is connected to the interior of the lower joint 12, so that the cable can enter the lower joint 12 and the interior of the lower pipe column from the upper pipe outside the upper joint 9; the lower joint is also connected in series with the lower pipe column.

[0132] In this embodiment, the dynamic analysis module includes:

[0133] The injection rate optimization unit is used to optimize the injection rate of each water injection well according to the water injection data of each water injection well and the oil production data of each oil production well, and obtain the optimized injection rate of each layer of the water injection well;

[0134] An injection-production relationship confirmation unit is used to determine the connection relationship between each water injection well and each oil production well based on the water injection data of each water injection well and the oil production data of each oil production well;

[0135] The optimal water injection plan generation unit is used to determine the optimal water injection plan based on the optimized injection volume of each layer of each water injection well and the connectivity relationship between each water injection well and each oil production well. The optimal water injection plan includes the total water injection volume and the producer flow rate of each injection layer of the water injection well.

[0136] Furthermore, the configuration quantity optimization unit is implemented by relying on a neural network model.

[0137] The present invention quantitatively optimizes the injection volume of each injection layer section of each water injection well based on well location data and water injection data and oil production data obtained by selecting the type of tubing according to complex geological information. It also automatically identifies the connectivity between each layer section of the water injection well and the oil production well based on the water injection data and oil production data obtained by selecting the type of tubing according to complex geological information, thereby generating an optimal water injection plan.

[0138] In this embodiment, the adjustment module includes a water injection calibrator, which is used to adjust the water injection volume of each injection layer of the water injection well according to the optimal water injection plan.

[0139] In this embodiment, the water injection calibrator includes a controller, an actuator, and a flow meter;

[0140] The controller is used to generate water injection amount adjustment instructions for each water injection layer according to the optimal water injection plan;

[0141] The actuator is used to adjust the water injection amount of each water injection layer according to the water injection amount adjustment instruction of each water injection layer;

[0142] The flow meter is used to measure the water injection volume input by the water injection calibrator.

[0143] Long-term water injection in downhole intelligent water distributors can cause the nozzles to drift and the flowmeter to distort, leading to inaccurate flow measurements. To address this issue, this application provides a water injection calibrator for automatic flow calibration. The basic principle of this water injection calibrator is to install a flow meter at the wellhead to read the inflowing fluid flow in real time. Using this as a benchmark, the accuracy of the downhole water distributor nozzle is analyzed by comparing the inflowing fluid flow rate with the sum of the flow rates of each downhole distributor. When the error is greater than the set error, it indicates that the downhole nozzle is seriously drifting, and the flow calibration function is automatically activated.

[0144] In this embodiment, the water injection calibrator is also used to calibrate the water injection volume of each water injection layer;

[0145] The controller of the water injection calibrator is also used to obtain the total water injection volume of the water injection well and the flow rate of the production device of each water injection layer of the well according to the optimal water injection plan.

[0146] The controller is used to determine whether the total water injection volume of the water injection well is equal to the sum of the flow rates of the distributors of each water injection layer of the well;

[0147] If not, a water injection calibration instruction is generated;

[0148] The actuator is further used to calibrate the flow rate of the distributor of each water injection layer according to the water injection calibration instruction.

[0149] The specific steps of the actuator calibrating the flow rate of the production device of each water injection layer are:

[0150] Select the target layer to be calibrated, open the water nozzle of the stratified water injection measurement and control instrument of the target layer, and close the water nozzles of the stratified water injection measurement and control instruments of other layers;

[0151] The surface automatic calibrator life cycle controller is set to constant flow state to control the flow rate of the entire well;

[0152] The constant flow value is the preset flow correction value, the constant flow is stable for 5 minutes, and 3 or more flow points are selected;

[0153] Combined with the surface flow value and the flow measured by the target layer stratified water injection control instrument, the flow coefficient is automatically corrected;

[0154] Modify the target layer and calibrate other layers according to the above steps.

[0155] Furthermore, in other embodiments of the present invention, a flow deviation threshold is set, and when the difference between the total water injection volume and the sum of the flow rates of the distributors of each water injection layer exceeds the flow deviation threshold, a water injection calibration instruction is generated.

[0156] Figure 12 is a flow chart of the method for intelligent injection-production collaborative development of a water-flooding reservoir in the late stage provided by an embodiment of the present invention. As shown in Figure 12, the method for intelligent injection-production collaborative development of a water-flooding reservoir in the late stage provided by this embodiment includes the following steps:

[0157] S1. Determine the type of water injection string to be installed in each water injection well based on the pre-acquired string constraint information, and determine the type of oil production string to be installed in each oil production well based on the pre-acquired string constraint information;

[0158] S2 obtains the working data of the water injection string installed in each water injection well and the working data of the production string installed in each oil well, and obtains the water injection data of each water injection well and the oil production data of each oil well based on the working data;

[0159] S3. Dynamically analyze the injection data of each water injection well and the oil production data of each oil production well to determine the optimal water injection plan;

[0160] S4. Adjust the injection rate of each injection well according to the optimal water injection plan to obtain the optimal oil production in the target area.

[0161] In this embodiment, the method further includes:

[0162] Acquire well location data within the target area, and obtain multiple water injection wells and oil production wells within the target area;

[0163] The geological data of each water injection well and each oil production well are obtained, and the tubing string constraint information of each water injection well and the tubing string constraint information of each oil production well are obtained based on the geological data.

[0164] In step S1, the string constraint information includes: casing change constraint information and well inclination constraint information;

[0165] The method of determining the type of water injection string to be installed in each water injection well based on the pre-acquired string constraint information includes:

[0166] Obtaining the casing change value of the casing change constraint information of the water injection well and the inclination value of the inclination constraint information in the well;

[0167] If it is determined that the casing change value of the water injection well exceeds the first preset value, it is determined that the water injection well needs to be installed with a casing change well water injection string;

[0168] If it is determined that the inclination value of the water injection well exceeds the second preset value, it is determined that the water injection well needs to be installed with a built-in cable water injection string.

[0169] In step S1, the type of production tubing to be installed in each oil well is determined based on pre-acquired tubing constraint information, including:

[0170] Obtaining the casing change value of casing change constraint information of the oil production well;

[0171] If it is determined that the casing change value of the casing change constraint information of the oil production well exceeds the third preset value, it is determined that the oil production well needs to be installed with a sidetrack production string.

[0172] In step S3, the water injection data of each water injection well and the oil production data of each oil production well are dynamically analyzed to determine the optimal water injection plan, including:

[0173] According to the water injection data of each water injection well and the oil production data of each oil production well, the injection rate of each water injection well is optimized to obtain the optimized injection rate of each injection well layer;

[0174] Determine the connectivity between each water injection well and each oil production well based on the water injection data of each water injection well and the oil production data of each oil production well;

[0175] The optimal water injection plan is determined based on the optimized injection volume of each injection well and the connectivity between each injection well and each oil production well. The optimal water injection plan includes the total water injection volume and the flow rate of the producer of each injection layer of the injection well.

[0176] In this embodiment, the method further includes:

[0177] The water injection rate of each injection well is adjusted according to the optimal water injection plan through the water injection calibrator to obtain the optimal oil production in the target area.

[0178] The late intelligent injection-production collaborative development method for water-flooding oil reservoirs provided in this application is implemented based on the late intelligent injection-production collaborative development system for water-flooding oil reservoirs as described above.

[0179] A third aspect of the present invention provides a computer device, comprising:

[0180] Memory;

[0181] processor; and

[0182] computer programs;

[0183] The computer program is stored in a memory and is configured to be executed by a processor to implement the above-mentioned method for intelligent injection-production collaborative development in the late stage of a water-flooding oil reservoir.

[0184] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to implement the above-mentioned method for intelligent injection-production collaborative development of a water-flooding reservoir in the late stage.

[0185] It will be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention may be implemented in various computer languages, for example, the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0186] The present invention is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0187] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0188] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0189] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0190] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A water-drive reservoir late intelligent injection-production collaborative development system, characterized in that: include: A pipe string type confirmation module is used to determine the type of water injection pipe string to be installed in each water injection well and the type of oil production pipe string to be installed in each oil production well according to the pipe string constraint information obtained in advance; A production data acquisition module is used to acquire the working data of the water injection string installed in each water injection well and the working data of the oil production string installed in each oil production well, and obtain the water injection data of each water injection well and the oil production data of each oil production well according to the working data; Dynamic analysis module, used to dynamically analyze the water injection data of each water injection well and the oil production data of each oil production well to determine the optimal water injection plan; An adjustment module, used for adjusting the water injection amount of each water injection well according to the optimal water injection scheme to obtain the optimal oil production in the target area; Wherein, the dynamic analysis module includes: The injection amount optimization unit is used to optimize the injection amount of each water injection well according to the water injection data of each water injection well and the oil production data of each oil production well, so as to obtain the optimized injection amount of each layer of each water injection well; An injection-production relationship confirmation unit is used to determine the connection relationship between each water injection well and each oil production well according to the water injection data of each water injection well and the oil production data of each oil production well; The optimal water injection plan generation unit is used to determine the optimal water injection plan based on the optimized injection volume of each layer of each water injection well and the connectivity between each water injection well and each oil production well. The optimal water injection plan includes the total water injection volume and the production flow of each injection layer of the water injection well.

2. The water drive reservoir late stage intelligent injection and production collaborative development system according to claim 1 is characterized in that: The system further comprises: The tubing constraint information determination module is used to obtain the well location data in the target area, obtain multiple water injection wells and oil production wells in the target area, and obtain the geological data of each water injection well and each oil production well, and obtain the tubing constraint information of each water injection well and the tubing constraint information of each oil production well based on the geological data.

3. The water drive reservoir late stage intelligent injection and production collaborative development system according to claim 2 is characterized in that: The string constraint information includes: casing change constraint information and well inclination constraint information; The tubing confirmation module is specifically used to obtain the casing change value of the casing change constraint information of the water injection well and the inclination value of the inclination constraint information in the well; If it is determined that the casing change value of the water injection well exceeds the first preset value, it is determined that the water injection well needs to be installed with a casing change well water injection string; If it is determined that the inclination value of the water injection well exceeds the second preset value, it is determined that the water injection well needs to be installed with a built-in cable water injection string.

4. The water drive reservoir late stage intelligent injection and production collaborative development system according to claim 3 is characterized in that: The tubing string confirmation module is specifically used to obtain the casing change value of the casing change constraint information of the oil production well; If it is determined that the casing change value of the casing change constraint information of the oil production well exceeds the third preset value, it is determined that the oil production well needs to be installed with a side drilling oil production string.

5. The water drive reservoir late stage intelligent injection and production collaborative development system according to claim 3 is characterized in that: The casing-change well water injection string comprises an anti-locking mechanism, which is installed in the casing-change well water injection string. When the casing-change well water injection string enters the water injection well, the anti-locking mechanism is used to lock the backwash valve.

6. The water drive reservoir late stage intelligent injection and production collaborative development system according to claim 5, characterized in that: The casing-changeable well water injection pipe string also includes a large expansion ratio rubber cylinder, and the expansion ratio of the large expansion ratio rubber cylinder is greater than 1.

4.

7. The water drive reservoir late stage intelligent injection and production collaborative development system according to claim 3 is characterized in that: The built-in cable water injection column includes a wireless docking power supply communication device, and the wireless docking power supply communication device includes a connecting male head and a connecting female head; The male connector is provided with a transmitting circuit and a transmitting coil, and the female connector is provided with a receiving circuit and a receiving coil; The female connector is installed above the pipe string in the well, and the male connector is driven by the downhole cable to go into the pipe string and inserted into the female connector to form an electromagnetic coupling loop.

8. The water drive reservoir late stage intelligent injection and production collaborative development system according to claim 4, characterized in that: The side drilling well production pipe string includes a cable crossing device, and the cable crossing device includes an external connector, an upper joint and a lower joint; The upper end of the external connector is connected to the upper connector, and the lower end of the external connector is connected to the lower connector; A cable channel is provided in the upper joint, and the cable channel is communicated with the lower joint; the lower joint is also connected to the pipe string; The cable passes through the cable channel of the upper joint and the lower joint in sequence and enters the interior of the tubular column of the tubular column string.

9. The water drive reservoir late stage intelligent injection-production collaborative development system according to claim 1, characterized in that: The adjustment module includes a water injection calibrator, which is used to adjust the water injection volume of each water injection layer of the water injection well according to the optimal water injection plan.

10. The water drive reservoir late stage intelligent injection and production collaborative development system according to claim 9, characterized in that: The water injection calibrator includes a controller, an actuator and a flow meter; The controller is used to generate water injection amount adjustment instructions for each water injection layer according to the optimal water injection plan; The actuator is used to adjust the water injection amount of each water injection layer according to the water injection amount adjustment instruction of each water injection layer; The flow meter is used to measure the water injection volume input by the water injection calibrator.

11. The water drive reservoir late stage intelligent injection and production collaborative development system according to claim 10, characterized in that: The water injection calibrator is also used to calibrate the water injection volume of each water injection layer; The controller of the water injection calibrator is also used to obtain the total water injection volume of the water injection well and the flow rate of the distributor of each water injection layer of the well according to the optimal water injection plan; The controller is used to determine whether the total water injection volume of the water injection well is equal to the sum of the flow rates of the distributors of each water injection layer of the well; If not, a water injection calibration instruction is generated; The actuator is also used to calibrate the flow rate of the distributor of each water injection layer according to the water injection calibration instruction.

12. A method for intelligent injection-production collaborative development of water-flooding reservoirs in the late stage, characterized in that: include: Determine the type of water injection string to be installed in each water injection well according to the pre-acquired string constraint information, and determine the type of oil production string to be installed in each oil production well according to the pre-acquired string constraint information; Obtaining the working data of the water injection string installed in each water injection well and the working data of the oil production string installed in each oil production well, and obtaining the water injection data of each water injection well and the oil production data of each oil production well according to the working data; Dynamically analyze the water injection data of each water injection well and the oil production data of each oil production well to determine the optimal water injection plan; According to the optimal water injection scheme, the water injection volume of each water injection well is adjusted to obtain the best production in the target area. Oil quantity; The dynamic analysis of the water injection data of each water injection well and the oil production data of each oil production well to determine the optimal water injection scheme includes: According to the water injection data of each water injection well and the oil production data of each oil production well, the injection amount of each water injection well is optimized to obtain the optimized injection amount of each layer of the water injection well; Determine the connectivity between each water injection well and each oil production well based on the water injection data of each water injection well and the oil production data of each oil production well; The optimal water injection plan is determined based on the optimized injection volume of each layer of each water injection well and the connectivity between each water injection well and each oil production well. The optimal water injection plan includes the total water injection volume and the flow rate of the producer of each injection layer of the water injection well.

13. The method for late intelligent injection-production collaborative development of water-flooding reservoirs according to claim 12, characterized in that: The method further comprises: Acquire well location data in the target area, and obtain multiple water injection wells and oil production wells in the target area; The geological data of each water injection well and each oil production well are obtained, and the tubing constraint information of each water injection well and the tubing constraint information of each oil production well are obtained according to the geological data.

14. The method for late intelligent injection-production collaborative development of water-flooding reservoirs according to claim 13, characterized in that: The string constraint information includes: casing change constraint information and well inclination constraint information; The method of determining the type of water injection string to be installed in each water injection well according to the pre-acquired string constraint information includes: Obtaining the casing change value of the casing change constraint information of the water injection well and the inclination value of the inclination constraint information in the well; If it is determined that the casing change value of the water injection well exceeds the first preset value, it is determined that the water injection well needs to be installed with a casing change well water injection string; If it is determined that the inclination value of the water injection well exceeds the second preset value, it is determined that the water injection well needs to be installed with a built-in cable water injection string.

15. The method for late intelligent injection-production collaborative development of water-flooding reservoirs according to claim 14, characterized in that: The method of determining the type of production tubing to be installed in each oil production well according to the pre-acquired tubing constraint information includes: Obtaining casing change values ​​of casing change constraint information of the oil production well; If it is determined that the casing change value of the casing change constraint information of the oil production well exceeds the third preset value, it is determined that the oil production well needs to be installed with a side drilling oil production string.

16. The method for late intelligent injection-production collaborative development of water-flooding reservoirs according to claim 12, characterized in that: The method further comprises: The water injection calibrator is used to adjust the water injection volume of each injection well according to the optimal water injection plan to obtain the optimal oil production in the target area.

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