Waterflooding and well flushing system and integrated water distributor thereof

Abstract

The present invention relates to the field of oil production engineering equipment. Disclosed are a waterflooding and well flushing system and an integrated water distributor thereof. The integrated water distributor comprises a main body with a hollow channel, and a setting mechanism slidably sleeved on the main body, wherein the main body is internally provided with a well-flushing fluid channel, a waterflooding valve, and a well flushing and waterflooding control mechanism for controlling the connection state of the well-flushing fluid channel and the open / closed state of the waterflooding valve; the well flushing and waterflooding control mechanism comprises a well flushing and waterflooding shared electrically-controlled transmission shaft and a well-flushing piston; and the waterflooding valve is connected to the well flushing and waterflooding shared electrically-controlled transmission shaft. When the waterflooding valve moves to an open state as the well flushing and waterflooding shared electrically-controlled transmission shaft slides, the hollow channel is in communication with a space outside the main body, and at the same time, the well-flushing piston blocks the well-flushing fluid channel. The integrated water distributor can effectively prevent the well-flushing fluid channel from being accidentally connected due to residual pressure of strata during waterflooding operation.

Description

Water injection and well washing system and its integrated water distributor

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Chinese patent application 202311868286.0 filed on December 29, 2023, the contents of which are incorporated herein by reference. Technical Field

[0003] The present invention relates to oil production engineering equipment, in particular to an integrated water distributor. Based on this, the present invention also relates to a water injection and well washing system comprising the integrated water distributor. Background Art

[0004] Waterflooding is a primary method for oilfield development due to its low cost and wide applicability. However, as waterflooding continues, impurities accumulate downhole, leading to a decrease in flooding effectiveness. Therefore, regular well flushing is necessary. This involves injecting large quantities of clean water through the casing to the bottom of the well and then returning it to the surface through the oil pipeline. This flushing removes impurities, cleansing the wellbore, improving water injection quality, and enhancing the effectiveness of waterflooding.

[0005] In the field of stratified water injection, targeted water injection strategies are implemented to isolate individual strata. Packers are used in downhole tubing strings as isolation tools between strata. As part of the downhole production string, once set, the packer remains sealed until the end of the string's life, preventing flushing water from reaching the bottomhole through the packer's rubber sleeve. To address this, a common practice is to integrate a mechanical hydraulic flushing mechanism into the packer. Specifically, a flushing channel is designed within the inner layer of the packer's rubber sleeve, connecting both ends of the packer's rubber sleeve. A flushing valve is installed at the inlet of the flushing channel. The flushing channel is controlled by the pressure differential between the tubing and the casing. When the flushing operation begins, water is injected into the casing. When the water pressure from the casing exceeds the water pressure in the central channel, the flushing valve activates, opening the flushing channel and connecting the annular spaces above and below the packer's rubber sleeve. Flushing water flows through the flushing channel, ultimately reaching the bottomhole and returning to the surface through the tubing. When water injection is resumed, water is injected from the oil pipe. The pressure in the center channel of the packer is greater than the pressure in the casing. The well washing valve is activated, the well washing channel is closed, and the annular spaces on the upper and lower sides of the packer rubber cylinder are isolated from each other to facilitate water injection through the oil pipe.

[0006] With the development of stratified water injection technology, cable-controlled intelligent stratified water injection technology integrates sensors and control valves into intelligent water distributors and transmits signals to the surface via cables. This enables remote data acquisition and flow control of injection wells, significantly improving testing efficiency, shortening testing and adjustment cycles, and increasing injection qualification rates. Because the communication cable exists outside the tubing, a cable channel, known as a cable-operated packer, is added to the packer. The well-washing channel control of the cable-operated packer is hydraulically controlled, similar to that of conventional packers. The intelligent water distributor is connected to the cable-operated packer via a tubing nipple. This single-layer water injection tool for intelligent water injection wells is typically suitable for intervals of 4 meters or greater.

[0007] In actual production, the well-washing mechanisms of the conventional ordinary packers and cable packers mentioned above have certain problems due to their mechanical hydraulic control mode: that is, when it is necessary to temporarily stop water injection, the high residual pressure in the formation may cause the casing pressure to be higher than the tubing pressure, resulting in the well-washing mechanism being mistakenly opened, causing the two ends of the packer rubber sleeve to be accidentally connected, thereby causing the casing pressure to increase or the "layer-crossing" phenomenon between different water injection sections.

[0008] Chinese invention patent application CN116357278A discloses an eccentric integrated intelligent water distributor and control method. During well flushing, water is injected into the casing. Water pressure acts on a reusable overflow well-flushing piston, forcing it to move away from the inlet, opening the inlet. This allows water in the upper casing space to enter the main body through the inlet, and then into the lower casing space, achieving the purpose of well flushing. When water injection is required, water is injected into the main body's inlet pipe, causing the reusable overflow well-flushing piston to move downward under the action of water pressure and block the inlet, thereby achieving water injection. When residual formation pressure is high, if the casing pressure is high, the reusable overflow well-flushing piston may move upward, accidentally opening the inlet, and causing the well flushing mechanism to activate inadvertently. Summary of the Invention

[0009] The purpose of the present invention is to overcome the problem in the prior art that the mechanical well flushing mechanism is easily opened by mistake when the pressure in the casing is high, and to provide an integrated water distributor, which can effectively prevent the well flushing fluid channel from being opened by mistake due to residual pressure in the formation during the water injection operation.

[0010] To achieve the above object, the present invention provides an integrated water distributor, comprising a main body, the main body being formed with a hollow channel;

[0011] a setting mechanism slidably sleeved on the main body, wherein a setting pressure chamber connected to the hollow passage is defined between the setting mechanism and the main body, so that when water is injected into the setting pressure chamber through the hollow passage, the setting mechanism can slide from an initial state and expand to a setting state under the action of the water pressure;

[0012] The main body is provided with a well-washing fluid channel, a water injection valve, and a well-washing water injection control mechanism for controlling the on-off state of the well-washing fluid channel and the opening and closing state of the water injection valve. When the well-washing fluid channel is in a connected state, the outer spaces of the main body respectively located above and below the setting mechanism in the setting state are connected to each other.

[0013] In which, the well-washing and water injection control mechanism includes an electrically controlled transmission shaft for well-washing and water injection and a well-washing piston. The well-washing piston extends into the well-washing fluid channel and can be driven to slide relative to the main body through the electrically controlled transmission shaft for well-washing and water injection. The water injection valve is connected to the electrically controlled transmission shaft for well-washing and water injection, and when the water injection valve moves to an open state as the electrically controlled transmission shaft slides, the hollow channel is connected to the outer space of the main body, and the well-washing piston blocks the well-washing fluid channel.

[0014] Preferably, the well-washing fluid channel comprises a well-washing fluid inlet hole and a well-washing fluid outlet hole which are axially spaced apart and formed on the main body, and the well-washing fluid inlet hole is located above the setting mechanism.

[0015] Preferably, the sealing mechanism closes the well-washing outlet in the initial state and opens the well-washing outlet in the sealing state.

[0016] Preferably, the well-washing piston is configured to have a partition block which is always located between the well-washing fluid outlet and the water injection valve and is in sliding cooperation with the main body.

[0017] Preferably, the well-washing and water-injection control mechanism further comprises a transmission actuator for driving the electrically controlled transmission shaft for well-washing and water-injection, and a main control circuit whose signal is connected to the transmission actuator is provided in the main body.

[0018] Preferably, a cable channel is formed in the main body to allow a power line and / or a signal line to pass through the cable channel from the upper end of the main body and be electrically connected to the main control circuit and / or the transmission actuator.

[0019] Preferably, the setting mechanism includes a setting rubber cylinder, a setting sleeve abutting the lower end of the setting rubber cylinder, and a setting piston arranged between the setting sleeve and the main body and axially abutting the setting sleeve. The water pressure in the setting pressure chamber acts on the bottom surface of the setting piston so that the setting rubber cylinder can expand to a setting state by pushing the setting mechanism upward.

[0020] Preferably, a setting locking mechanism for locking the setting mechanism in a setting state is further provided between the setting sleeve and the main body.

[0021] A second aspect of the present invention provides a water injection and well washing system, comprising a casing, an oil pipe extending through the casing, and the above-mentioned integrated water distributor connected to the bottom end of the oil pipe.

[0022] Through the above-described technical solution, the integrated water distributor of the present invention controls the on / off state of the well-washing fluid channel and the opening / closing state of the water injection valve via the well-washing and water injection control mechanism, allowing its operating state to be switched between well-washing and water injection states, thereby enabling selective execution of the well-washing and water injection processes as needed. Because the on / off state of the well-washing fluid channel and the opening / closing state of the water injection valve are synchronously controlled by the sliding of the electrically controlled drive shaft for both well-washing and water injection, the electrically controlled drive shaft can remain in a position that blocks the well-washing fluid channel even when high residual pressure in the formation exists during water injection or when water injection is temporarily stopped, thereby preventing the well-washing mechanism from accidentally opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a cross-sectional structural diagram of an integrated water distributor according to a preferred embodiment of the present invention.

[0024] Explanation of the reference numerals: 1-upper connector; 2-cable channel; 3-well washing fluid channel; 31-well washing fluid inlet; 32-well washing fluid outlet; 4-main body; 41-hollow channel; 5-sealing mechanism; 51-sealing rubber cylinder; 52-sealing sleeve; 53-sealing piston; 5a-sealing pressure chamber; 6-sealing locking mechanism; 7-well washing and water injection control mechanism; 71-well washing piston; 711-partitioning block; 72-electrically controlled transmission shaft for well washing and water injection; 73-transmission actuator; 8-water injection valve; 9-main control circuit; 10-lower connector. DETAILED DESCRIPTION

[0025] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0026] In the present invention, unless otherwise specified, directional words such as "up, down, left, right" generally refer to up, down, left, right as shown in the reference drawings; "inside, outside" refer to inside and outside relative to the outline of each component itself.

[0027] As shown in Figure 1, one aspect of the present invention provides an integrated water distributor, including a main body 4 formed with a hollow channel 41 and a sealing mechanism 5 slidably mounted on the main body 4. The hollow channel 41 extends substantially along the axial direction of the main body 4 so as to transport water for injection into the water injection layer through the hollow channel 41. The upper and lower ends of the main body 4 may be provided with an upper joint 1 and a lower joint 10, respectively, and the upper joint 1 may be connected to the bottom end of the oil pipe through an oil pipe female buckle. Since the upper joint 1 and the lower joint 10 are mainly used to connect the main body 4 to other components, they are regarded as part of the main body 4 in the present invention. For example, although the well washing liquid inlet 31 will be described later as being formed on the main body 4, it also includes the form formed on the upper joint 1 as shown in the figure.

[0028] To facilitate water injection and well flushing operations, the main body 4 is provided with a well flushing fluid channel 3, a water injection valve 8, and a well flushing and water injection control mechanism 7 for controlling the on / off state of the well flushing fluid channel 3 and the opening and closing state of the water injection valve 8. When the water injection valve 8 is controlled to be in the open state, the hollow channel 41 of the main body 4 communicates with the space outside the main body 4, allowing water transported within the hollow channel 41 (e.g., from the oil pipe connected to the upper connector 1) to be injected into the water injection layer. When the well flushing fluid channel 3 is controlled to be in the connected state, the space outside the main body 4 located above the setting mechanism 5 is connected to the space outside the main body 4 below the setting mechanism 5 in the set state. As a result, water injected through the casing can flow through the well flushing fluid channel 3 into the annular space below the setting mechanism 5, achieving the well flushing operation.

[0029] The well-washing and water-injection control mechanism 7 controls the on / off state of the well-washing fluid channel 3 and the opening and closing state of the water injection valve 8 through the same actuator. This allows the well-washing and water-injection processes to be performed independently, thereby preventing the well-washing fluid channel from being accidentally opened due to residual formation pressure during the water injection operation. Specifically, the well-washing and water-injection control mechanism 7 may include an electrically controlled drive shaft 72 for both well-washing and water-injection, and a well-washing piston 71 extending into the well-washing fluid channel 3 and drivable to slide relative to the main body 4. To this end, a working channel may be formed within the main body 4 below the well-washing fluid outlet 32, within which the electrically controlled drive shaft 72 and the well-washing piston 71 extend. The water injection valve 8 may be connected to the electrically controlled drive shaft 72. When the electrically controlled drive shaft 72 moves to an open state, connecting the hollow channel 41 to the space outside the main body 4, the well-washing piston 71 blocks the well-washing fluid channel 3. 1 , when the electrically controlled drive shaft 72 and the well-washing piston 71 are driven to their lower limit positions (i.e., before descending into the well), the well-washing piston 71 blocks the well-washing fluid passage 3, the water injection valve 8 is open, and the hollow passage 41 is connected to the outer space of the main body 4. When the electrically controlled drive shaft 72 and the well-washing piston 71 are driven to their upper limit positions, the well-washing fluid passage 3 is switched to a connected state, while the water injection valve 8 is closed. At this time, the setting and well-washing operations can be performed. During the water injection process, the opening of the water injection valve 8 can be adjusted by controlling the movement position of the electrically controlled drive shaft 72, thereby controlling the water injection volume. At this time, the well-washing piston 71 can maintain the blockage of the well-washing fluid passage 3.

[0030] This integrated water distributor controls the on / off state of the well-washing fluid channel and the opening / closing state of the water injection valve via a well-washing and water injection control mechanism. This allows switching between well-washing and water injection modes, enabling selective execution of well-washing and water injection processes as needed. Because the on / off state of the well-washing fluid channel and the opening / closing state of the water injection valve are synchronously controlled by the sliding of a combined electrically controlled drive shaft for well-washing and water injection, and are unaffected by the water pressure outside the main body (inside the casing), the electrically controlled drive shaft can remain in a position that blocks the well-washing fluid channel even during water injection operations or when water injection is temporarily stopped, preventing accidental activation of the well-washing mechanism.

[0031] Among them, a sealing pressure chamber 5a can be defined between the sealing mechanism 5 and the main body 4, and the sealing pressure chamber 5a is connected to the hollow channel 41 of the main body 4, so that when water is injected into the sealing pressure chamber 5a through the hollow channel 41, the sealing mechanism 5 can slide from the initial state and expand to the sealing state under the action of water pressure, thereby sealing the water injection layer.

[0032] Thus, the integrated water distributor, by integrating the setting mechanism 5, can expand the setting mechanism 5 into the setting state by injecting water into the setting pressure chamber 5a through the hollow channel 41 of the main body 4, thereby integrating the isolation function of the water injection layer and the water injection function of the water injection layer into the same tool. Therefore, there is no need to connect additional cable packers through oil pipe short sections, which facilitates the subdivision of water injection into the downhole water injection layer with a smaller interlayer spacing, such as a minimum of 2 meters. Among them, because the well washing and water injection processes are not carried out simultaneously, the well washing and water injection control mechanism 7 can be controlled as follows: when the well washing fluid channel 3 is in a connected state, the water injection valve 8 is in a closed state to enable the well washing operation; when the well washing fluid channel 3 is in a disconnected state, the water injection valve 8 is in an open state to enable the water injection operation. It should be understood that, as will be described later, the water injection valve 8 may also be maintained in its initial open state before being lowered into the predetermined position in the downhole casing; before the setting mechanism 5 is set, the setting operation is performed by utilizing the water pressure injected into the setting pressure chamber 5a through the hollow channel 41 of the main body 4. Therefore, the water injection valve 8 should be maintained in a closed state during the setting process.

[0033] In the illustrated preferred embodiment, the well-washing fluid channel 3 includes a well-washing fluid inlet 31 and a well-washing fluid outlet 32, axially spaced apart, formed on the main body 4. The well-washing fluid inlet 31 is located above the setting mechanism 5. More specifically, the well-washing fluid inlet 31 is formed on the upper joint 1. Thus, water injected into the casing can enter the well-washing fluid channel 3 within the main body 4 through the well-washing fluid inlet 31. Water then flows through the well-washing fluid channel 3 to below the setting mechanism 5 in the set state, bypassing the setting mechanism 5 and delivering the well-washing fluid to the annular space below it, thus completing the well-washing operation.

[0034] Since the well-washing operation needs to be performed in the set state, the well-washing fluid passage 3 can remain disconnected when the setting mechanism 5 is not set. To this end, the setting mechanism 5 can close the well-washing fluid outlet 32 ​​in its initial state and open it in the set state. This allows the axial spacing between the well-washing fluid outlet 32 ​​and the well-washing fluid inlet 31 to be relatively small, thereby improving the structural compactness.

[0035] To prevent the water injection and well flushing processes from interfering with each other, in addition to properly arranging the relative positions of the combined electric-controlled drive shaft 72 for well flushing and water injection, the well flushing piston 71, the well flushing fluid passage 3, and the water injection valve 8, a partition block 711 that slidably engages with the main body 4 (the working passage) can be provided on the portion of the well flushing piston 71 located between the well flushing fluid outlet 32 ​​and the water injection valve 8. This partition block 711 can prevent leakage into the well flushing fluid passage 3 during water injection, or leakage of well flushing fluid into the water injection valve 8 during well flushing. Furthermore, the partition block 711 can guide the stable movement of the well flushing piston 71.

[0036] The electrically controlled drive shaft 72 and the well-washing piston 71 for both well-washing and water injection can be driven to slide axially by a suitable actuator, such as a relay. In the illustrated preferred embodiment, the well-washing and water injection control mechanism 7 also includes a transmission actuator 73 for driving the electrically controlled drive shaft 72. A main control circuit 9 is located within the main body 4, with signal connections to the transmission actuator 73. A cable channel 2 may also be formed within the main body 4 to allow power and / or signal cables to pass through the cable channel 2 from the upper end of the main body 4 and be electrically connected to the main control circuit 9 and / or the transmission actuator 73. In the illustrated preferred embodiment, the cable channel 2 extends from the upper connector 1 to the lower connector 10, allowing control cables to pass through it. In alternative embodiments, control components, such as the main control circuit 9, may be located outside the main body 4, as long as they can drive the electrically controlled drive shaft 72 and the well-washing piston 71 via the transmission actuator 73.

[0037] Continuing with Figure 1 , the setting mechanism 5 can include a setting rubber cylinder 51, a setting sleeve 52 abutting the lower end of the setting rubber cylinder 51, and a setting piston 53 disposed between the setting sleeve 52 and the main body 4 and axially abutting the setting sleeve 52. The setting rubber cylinder 51 can be positioned by the joint 1 described above. The water pressure within the setting pressure chamber 5a acts on the bottom surface of the setting piston 53, pushing the setting mechanism 5 upward and expanding the setting rubber cylinder 51 to the set state. A setting locking mechanism 6 can also be disposed between the setting sleeve 52 and the main body 4 to lock the setting mechanism 5 in the set state.

[0038] On this basis, another aspect of the present invention provides a water injection and well washing system, which includes a casing, an oil pipe extending through the casing, and an integrated water distributor connected to the bottom end of the oil pipe. The integrated water distributor is the integrated water distributor provided by the above aspect of the present invention.

[0039] In order to better understand the technical solutions and advantages of the present invention, the operation process of the present invention is generally described below in conjunction with the preferred embodiments shown in the accompanying drawings:

[0040] Before going down the well, the setting mechanism 5 is in an unset state. The well flushing piston 71, the water injection valve 8 and the electric control transmission shaft 72 for well flushing and water injection are all located at the lower end. At this time, the well flushing outlet 32 ​​is in a closed state, and the water injection valve 8 is in an open state.

[0041] After connecting the oil pipe to the top of the main body 4, it is lowered into the downhole casing to the predetermined position. The main control circuit 9 controls the transmission actuator 73, causing the well-washing piston 71, the water injection valve 8, and the electronically controlled transmission shaft 72 for both well-washing and water injection to move upward to the upper end. At this point, the well-washing outlet 32 ​​is open, and the water injection valve 8 is closed. During setting, water is injected into the hollow passage 41 of the main body 4 through the oil pipe. The water pressure within the setting pressure chamber 5a pushes the setting piston 53 upward, squeezing the setting rubber cylinder 51, causing it to expand outward, completing the setting. The setting locking mechanism 6 has a stop function, which locks the setting sleeve 52 in a position that keeps the setting rubber cylinder 51 in its expanded state.

[0042] During water injection, water is injected into the oil pipe via the water injection pump. The main control circuit 9 controls the transmission actuator 73 to move the electrically controlled transmission shaft 72 for well flushing and water injection up and down, thereby changing the position of the water injection valve 8 to control the amount of water injected. At this time, the well flushing piston 71 is always in a state of isolating the well flushing fluid passage 3.

[0043] During well flushing, the main control circuit 9 controls the transmission actuator 73 to move the electrically controlled transmission shaft 72 for well flushing and water injection upward, first completely closing the water injection valve 8. The electrically controlled transmission shaft 72 then continues to move upward until the well flushing piston 71 opens the well flushing fluid passage 3. At this point, water is injected into the casing, and the water in the casing enters through the well flushing fluid inlet 31, passes through the setting mechanism 5, and reaches the well flushing fluid outlet 32, completing the well flushing function.

[0044] The integrated water distributor provided by this invention isolates the injection zone through a setting mechanism, combining isolation and injection functions into a single tool. This allows for subdivided injection of water into downhole injection zones with a minimum inter-layer spacing of two meters. Due to the fact that well flushing and water injection can occur independently, an electrically controlled well flushing piston and an electrically controlled drive shaft for both well flushing and water injection are provided. A single actuator is used to switch between the two operating modes.

[0045] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, the technical solution of the present invention may be subjected to a variety of simple modifications, including combining the various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. An integrated water distributor, characterized in that, Comprising: A main body (4) which is formed with a hollow channel (41), and a main control circuit (9) is provided inside the main body (4); A setting mechanism (5) slidably sleeved on the main body (4), a setting pressure chamber (5a) communicating with the hollow channel (41) is defined between the setting mechanism (5) and the main body (4), so that when water is injected into the setting pressure chamber (5a) through the hollow channel (41), the setting mechanism (5) can slide and expand from an initial state to a set state under the action of water pressure; Wherein, a washing fluid channel (3), a water injection valve (8) and a washing and water injection control mechanism (7) for controlling the on-off state of the washing fluid channel (3) and the opening and closing state of the water injection valve (8) are provided inside the main body (4), and when the washing fluid channel (3) is in a communicating state, the outer spaces of the main body (4) located above and below the setting mechanism (5) in the set state are communicated with each other; Wherein, the washing and water injection control mechanism (7) includes a washing and water injection combined electric control transmission shaft (72), a washing piston (71) and a transmission actuator (73) for driving the washing and water injection combined electric control transmission shaft (72), the washing piston (71) extends into the washing fluid channel (3), the transmission actuator (73) is signal-connected to the main control circuit (9), and can be controlled by the main control circuit (9) to make the washing and water injection combined electric control transmission shaft (72) and the washing piston (71) slide relative to the main body (4), the water injection valve (8) is connected to the washing and water injection combined electric control transmission shaft (72), when the water injection valve (8) moves to an open state along with the sliding of the washing and water injection combined electric control transmission shaft (72), the hollow channel (41) is communicated with the outer space of the main body (4), and at the same time the washing piston (71) blocks the washing fluid channel (3).

2. The integrated water distributor according to claim 1, wherein The washing fluid channel (3) has a washing fluid inlet hole (31) and a washing fluid outlet hole (32) axially spaced and formed on the main body (4), and the washing fluid inlet hole (31) is located above the setting mechanism (5).

3. The integrated water distributor according to claim 2, wherein The setting mechanism (5) closes the washing fluid outlet hole (32) in the initial state and opens the washing fluid outlet hole (32) in the set state.

4. The integrated water distributor according to claim 2, wherein The washing piston (71) is provided with a partition block (711) always located between the washing fluid outlet hole (32) and the water injection valve (8) and slidably engaged with the main body (4).

5. The integrated water distributor according to claim 1, characterized in that, A cable channel (2) is formed inside the main body (4) to allow a power line and / or a signal line to penetrate into the cable channel (2) from the upper end of the main body (4) and be electrically connected to the main control circuit (9) and / or the transmission actuator (73).

6. The integrated water distributor according to claim 1, characterized in that, The setting mechanism (5) includes a setting rubber cylinder (51), a setting sleeve (52) abutted against the lower end of the setting rubber cylinder (51), and a setting piston (53) disposed between the setting sleeve (52) and the main body (4) and axially abutted against the setting sleeve (52). The water pressure in the setting pressure chamber (5a) acts on the bottom surface of the setting piston (53) so as to be able to push the setting mechanism (5) upward to expand the setting rubber cylinder (51) into a set state.

7. The integrated water distributor according to claim 6, wherein, A setting locking mechanism (6) for locking the setting mechanism (5) in the set state is further provided between the setting sleeve (52) and the main body (4).

8. A water injection well washing system, characterized in that, Comprising a casing, an oil pipe extending through the casing, and an integrated water distributor according to any one of claims 1 to 7 connected to the bottom end of the oil pipe.

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