Hydraulic piston pressurizing water injection device and water injection unit

Abstract

The utility model discloses a hydraulic piston pressurizing water injection device and a water injection unit, which comprise a piston cylinder, a piston rod, a piston rod, a piston rod and a piston rod, the piston is arranged in the piston cylinder and isolates the upper cylinder body from the lower cylinder body, and the power cylinder is hermetically divided into a first power cavity and a second power cavity by the piston; the hydraulic module is used for supplying oil to the power cavity to drive the piston to move; the reversing module is used for replacing the oil supply and return direction of the hydraulic module; the water source well and the water distribution room are connected with the upper cylinder body and the lower cylinder body through pipelines, and are connected with the water distribution room and disconnected with the water source well when respective cylinder body spaces are compressed; and when the space of the cylinder body is expanded, the cylinder body is communicated with a water source well and disconnected with water distribution. The hydraulic module and the reversing module drive the piston to reciprocate, the single cylinder body absorbs water during expansion and injects water into the water distribution chamber during compression, and the single piston corresponds to compression of the two cylinder bodies, so that water is continuously injected in the whole movement process, and the requirements for water injection pressure and displacement are met.

Description

Technical Field

[0001] The utility model relates to the technical field of oil development equipment, and particularly relates to a hydraulic piston pressurized water injection device and a water injection unit. Background Technique

[0002] At present, during the development of most oil fields, it is necessary to inject water into the oil reservoir to maintain the formation pressure during the exploitation process. However, as the development process continues to deepen, the injection well will be blocked in the corresponding formation due to changes in geological conditions (increase in water content), resulting in an increase in water injection pressure and an increase in the difficulty of water injection. Therefore, it is necessary to adopt a pressurized water injection method. Currently, two types of units, namely multi-stage centrifugal pumps and high-pressure piston pumps, are commonly used for pressurized water injection. However, the maximum operating pressure of multi-stage centrifugal pumps is relatively low, and the efficiency at the best operating point generally does not exceed 60%. When injecting sewage, the efficiency and service life are even lower, and problems such as cavitation and corrosion are likely to occur; the operating pressure of high-pressure piston pumps is relatively high, but the failure rate during operation is high, the parts need to be frequently repaired and replaced, and the maintenance cost is high. For the commonly used high-pressure five-piston pumps, due to the influence of the crankshaft strength, the piston diameter is relatively small, generally not exceeding 70 mm, resulting in a relatively low single displacement. To meet a certain displacement, the stroke frequency of the piston needs to be very high, generally up to 350 - 400 strokes per minute. The high stroke frequency brings a series of problems to the piston pump, such as high noise, large vibration, frequent opening and closing collisions of the pump valves, increased wear of the bearing bushes, pistons and packings, resulting in many failures, frequent repair and replacement of parts, and very high maintenance costs. Especially when the working pressure is greater than 25 MPa, due to the deformation of the body and crankshaft under force, the vibration and noise will be more intense, and even normal operation cannot be achieved.

[0003] Therefore, how to meet the pressure and displacement requirements of oil reservoir water injection and reduce the equipment operation cost is a technical problem that needs to be urgently solved by those skilled in the art. Content of the Utility Model

[0004] In view of this, the purpose of the utility model is to provide a hydraulic piston pressurized water injection device to meet the pressure and displacement requirements of oil reservoir water injection and reduce the equipment operation cost.

[0005] Another purpose of the utility model is to provide a water injection unit including the above-mentioned hydraulic piston pressurized water injection device.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A hydraulic piston pressurized water injection device includes:

[0008] A piston cylinder, including an upper cylinder body and a lower cylinder body at both ends, and a power cylinder in the middle;

[0009] A piston is disposed within the piston cylinder to isolate the upper cylinder body and the lower cylinder body, and the power cylinder is hermetically divided by the piston into a first power chamber and a second power chamber;

[0010] A hydraulic module and a reversing module. The hydraulic module is used to supply hydraulic oil to the first power chamber and the second power chamber to drive the piston to move within the piston cylinder, and the reversing module is used to change the supply and return oil directions of the hydraulic module to change the movement direction of the piston within the piston cylinder;

[0011] A water source well and a water distribution room are both connected to the upper cylinder body and the lower cylinder body through pipelines. When the cylinder space of the upper cylinder body and the lower cylinder body is compressed, they are in communication with the water distribution room and disconnected from the water source well; when the cylinder space is expanded, they are in communication with the water source well and disconnected from the water distribution room.

[0012] Preferably, in the above hydraulic piston pressurized water injection device, the reversing module includes at least a first working position and a second working position. When the reversing module is in the first working position, the hydraulic module supplies oil to the first power chamber and receives the return oil from the second power chamber, and the piston moves towards the lower cylinder body; when the reversing module is in the second working position, the hydraulic module supplies oil to the second power chamber and receives the return oil from the first power chamber, and the piston moves towards the upper cylinder body.

[0013] Preferably, in the above hydraulic piston pressurized water injection device, the piston includes a first piston portion and a second piston portion disposed at both ends. The first piston portion extends into the upper cylinder body and seals the upper cylinder body and the power cylinder; the second piston portion extends into the lower cylinder body and seals the lower cylinder body and the power cylinder.

[0014] Preferably, in the above hydraulic piston pressurized water injection device, a sealing ring is recessed at the connection end of the power cylinder and the upper cylinder body, and the first piston portion is in close contact with the inner wall of the sealing ring and is sealingly arranged.

[0015] Preferably, in the above hydraulic piston pressurized water injection device, a position sensor is disposed inside the upper cylinder body. The position sensor is used to detect the running position of the first piston portion within the upper cylinder body and is communicatively connected to the reversing module. The reversing module changes the supply and return oil directions of the hydraulic module when the first piston portion runs to the upper limit position or the lower limit position.

[0016] Preferably, in the above hydraulic piston pressurized water injection device, the upper cylinder body is communicatively connected with a first pipeline. The first pipeline includes a main pipeline, a first branch pipeline, and a second branch pipeline. The first branch pipeline connects the main pipeline and the water source well, and a first one-way valve with a communication direction towards the main pipeline is arranged on the first branch pipeline; the second branch pipeline connects the main pipeline and the water distribution room, and a second one-way valve with a communication direction towards the water distribution room is arranged on the second branch pipeline.

[0017] Preferably, in the above hydraulic piston pressurized water injection device, the first one-way valve and the second one-way valve are integrated on a single valve body structure and arranged at intervals.

[0018] Preferably, in the above hydraulic piston pressurized water injection device, a water supply station is further arranged between the water source well and the piston cylinder. The water supply station is sequentially provided with a meter, a water quality treatment device, and a water storage tank along the water flow direction.

[0019] A water injection unit includes the hydraulic piston pressurized water injection device described in any one of the above embodiments, and further includes an oil pump unit and a pressure stabilizing energy storage device. The oil pump unit is used to drive the oil in the hydraulic module to run, and the pressure stabilizing energy storage device is used to balance the operating pressure of the hydraulic system.

[0020] Preferably, in the above water injection unit, a spillage system, a cleaning system, and a heat dissipation system are further included. The spillage system is used to collect and discharge the leakage liquid during the operation of the piston cylinder. The cleaning system is used to flush the pipelines of the water injection unit. The heat dissipation system is arranged around the hydraulic module to dissipate heat and cool the hydraulic oil.

[0021] As can be seen from the above technical solution, the hydraulic piston pressurized water injection device provided by the present utility model sets the piston cylinder as a combined structure of an upper cylinder body, a lower cylinder body and a power cylinder, and a single piston is arranged in the piston cylinder. The piston and the power cylinder of the piston cylinder are positionally matched to form a first power chamber and a second power chamber. The hydraulic module is simultaneously connected to the first power chamber and the second power chamber to inject hydraulic oil into the first power chamber and the second power chamber, so as to act on the piston and push the piston to move into the upper cylinder body or the lower cylinder body; when the piston moves towards any cylinder body, it will compress the corresponding cylinder space, and at the same time, this cylinder body is connected to the water distribution room to inject high-pressure water into the water distribution room. At this time, the space in the other cylinder body will expand and realize water absorption through connection with the water distribution room. The above structure can meet the compression and expansion requirements of two cylinder bodies through a single piston. At the same time, during a single movement process, both cylinder bodies generate action processes. Under the action of the commutation module, the piston reciprocates in the piston cylinder and repeats the actions on the two cylinder bodies, so that the hydraulic piston pressurized water injection device can continuously maintain pressurized water injection and reduce the stroke frequency of the piston. Similarly, under the condition of the same stroke frequency, the piston can meet the double pressure and displacement requirements, and the matching structure of the piston and the piston cylinder is simple and mature, with low operation and maintenance costs, improving the operation stability of the hydraulic piston pressurized water injection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 It is a schematic flow chart of the hydraulic module of the hydraulic piston pressurized water injection device provided by the embodiment of the present utility model supplying oil to the first power chamber;

[0024] Figure 2 It is Figure 1 a detailed view of the position of the power cylinder in

[0025] Figure 3 It is a schematic flow chart of the hydraulic module of the hydraulic piston pressurized water injection device provided by the embodiment of the present utility model supplying oil to the second power chamber;

[0026] Figure 4 It is a front view schematic diagram of the water injection unit;

[0027] Figure 5 It is Figure 4 a top view schematic diagram of

[0028] Among them, 10 - piston; 110 - first piston part; 120 - second piston part; 20 - piston cylinder; 210 - upper cylinder block; 2110 - main pipe; 2120 - first branch pipe; 2130 - second branch pipe; 2140 - first check valve; 2150 - second check valve; 220 - lower cylinder block; 230 - power cylinder; 2310 - first power chamber; 2320 - second power chamber; 30 - hydraulic module; 40 - commutation module; 50 - water source well; 510 - meter; 520 - water quality treatment equipment; 530 - water storage tank; 60 - water distribution room; 710 - oil pump unit; 720 - pressure stabilizing energy storage device; 730 - overflow system; 740 - cleaning system; 750 - heat dissipation system; 760 - hydraulic piston pressurized water injection device. Detailed implementation manners

[0029] The core of the present utility model lies in disclosing a hydraulic piston pressurized water injection device to meet the pressure and displacement requirements of oil reservoir water injection and reduce the equipment operation cost.

[0030] Another object of the present utility model is to provide a water injection unit including the above-mentioned hydraulic piston pressurized water injection device.

[0031] In order to enable the personnel in the technical field to better understand the solution of the present utility model, the embodiments of the present utility model will be described below with reference to the accompanying drawings. In addition, the embodiments shown below do not impose any limitation on the content of the utility model recorded in the claims. Additionally, all the content of the constitution shown in the following embodiments is not limited to what is necessary for the solution of the utility model recorded in the claims.

[0032] As Figures 1-3 shown, the hydraulic piston pressurized water injection device provided by the embodiment of the present utility model is used for pressurized water injection into the oil reservoir to meet the requirements of the oil extraction process. The hydraulic piston pressurized water injection device mainly includes a piston cylinder 20, a piston 10, a hydraulic module 30, a commutation module 40, a water source well 50 and a water distribution room 60. Among them, the piston cylinder 20 includes a wall for the piston 10 to be arranged, and the piston cylinder 20 sequentially includes an upper cylinder block 210, a power cylinder 230 and a lower cylinder block 220 in a single direction, so that the upper cylinder block 210 and the lower cylinder block 220 are located at both ends of the power cylinder 230. It should be noted that the power cylinder 230 is used for hydraulic oil to enter and achieve a driving effect, while the upper cylinder block 210 and the lower cylinder block 220 are used for sucking water from the water source and injecting it under pressure. The upper cylinder block 210 and the lower cylinder block 220 are two independent acting spaces. Therefore, in order to improve the uniformity of the action process of the hydraulic piston pressurized water injection device, it is preferred that the internal cavity volumes of the upper cylinder block 210 and the lower cylinder block 220 are equal and are evenly located at both ends of the power cylinder 230.

[0033] The piston 10 is disposed within the piston cylinder 20 so as to be able to move within the piston cylinder 20. The piston 10 is first disposed through the boundary positions between the upper cylinder block 210 and the power cylinder 230, and between the lower cylinder block 220 and the power cylinder 230, so as to isolate the upper cylinder block 210 and the power cylinder 230, as well as the lower cylinder block 220 and the power cylinder 230, maintaining the airtight effect of a single cylinder block and reducing the leakage risk during the use of the piston cylinder 20. Meanwhile, the piston 10 is provided with a convex structure in the area located within the power cylinder 230, and the convex structure is in close fit with the inner wall of the power cylinder 230, so as to divide the area within the power cylinder 230 except for the area where the piston 10 is disposed into relatively independent first power chamber 2310 and second power chamber 2320. The first power chamber 2310 and the second power chamber 2320 are respectively located on both sides of the convex structure of the piston 10, so as to act on the convex structure when under pressure and push the piston to move within the piston cylinder 20.

[0034] On the basis of the above structure, the hydraulic module 30 is used to supply hydraulic oil. Specifically, the hydraulic module 30 is respectively communicated with the first power chamber 2310 and the second power chamber 2320 through pipelines, so as to supply hydraulic oil to the first power chamber 2310 or the second power chamber 2320. And since the hydraulic module 30 is respectively communicated with the first power chamber 2310 and the second power chamber 2320, it can receive the return oil of the second power chamber 2320 when supplying oil to the first power chamber 2310; similarly, it can receive the return oil of the first power chamber 2310 when supplying oil to the second power chamber 2320. The commutation module 40 is disposed between the passage of the hydraulic module 30 and the power cylinder 230, and is used to change the supply and return oil directions of the hydraulic module 30. In this embodiment, when the hydraulic module 30 supplies oil to the first power chamber 2310 and receives the return oil of the second power chamber 2320, the pressure within the first power chamber 2310 increases and acts on the convex structure of the piston 10, thereby pushing the piston 10 to move towards the lower cylinder block 220, and the cavity space within the lower cylinder block 220 is compressed. And when the hydraulic module 30 supplies oil to the second power chamber 2320 and receives the return oil of the first power chamber 2310, the pressure within the second power chamber 2320 increases and acts on the convex structure of the piston 10, thereby pushing the piston 10 to move towards the upper cylinder block 210, and the cavity space within the upper cylinder block 210 is compressed. The setting of the commutation module 40 can realize the reciprocating movement of the piston 10 within the piston cylinder 20 and periodically compress the upper cylinder block 210 and the lower cylinder block 220.

[0035] Furthermore, the hydraulic piston pressurized water injection device provided by the embodiment of the present invention further includes a water source well 50 and a water distribution room 60. Among them, the water source well 50 is used to supply the initial water source, and the water distribution room 60 is used to receive high-pressure water and inject it into the oil layer after distribution. Specifically, both the water source well 50 and the water distribution room 60 are connected to the upper cylinder block 210 and the lower cylinder block 220 through pipelines, that is, the water source well 50 and the water distribution room 60 are simultaneously connected to the upper cylinder block 210, and at the same time they are simultaneously connected to the lower cylinder block 220 to form a passage for the water flow to pass through. At the same time, it should be noted that valve structures are provided on the pipelines connecting the upper cylinder block 210 and the lower cylinder block 220 with the water source well 50 and the water distribution room 60. Taking the upper cylinder block 210 as an example, when the hydraulic module 30 supplies oil to the first power chamber 2310 and receives the return oil from the second power chamber 2320, the piston 10 will be driven to move towards the lower cylinder block 220. At this time, the cavity space of the upper cylinder block 210 expands, and at the same time, the valve between the upper cylinder block 210 and the water source well 50 is adjusted to a passage, and the valve between the upper cylinder block 210 and the water distribution room 60 is adjusted to a cut-off. The upper cylinder block 210 absorbs water from the water source well 50 through the expanded space. Correspondingly, when the hydraulic module 30 is adjusted to supply oil to the second power chamber 2320 and receive the return oil from the first power chamber 2310 under the action of the commutation module 40, the piston 10 will be driven to move towards the upper cylinder block 210. At this time, the cavity space of the upper cylinder block 210 is compressed, and at the same time, the valve between the upper cylinder block 210 and the water source well 50 is adjusted to a cut-off, and the valve between the upper cylinder block 210 and the water distribution room 60 is adjusted to a passage. The upper cylinder block 210 conveys high-pressure water to the water distribution room 60 through the compression action to complete the water absorption and drainage process of the upper cylinder block 210.

[0036] It should be noted that for the lower cylinder block 220, its action process is complementary to and simultaneous with that of the upper cylinder block 210. Specifically, when the cavity space of the upper cylinder block 210 expands, the cavity of the lower cylinder block 220 contracts and supplies water to the water distribution room 60 through the valve action; when the cavity space of the upper cylinder block 210 contracts, the cavity of the lower cylinder block 220 expands and absorbs water from the water source well 50 through the valve action. The cooperative action of the upper cylinder block 210 and the lower cylinder block 220 can enable the piston 10 to perform water absorption and water supply actions when moving in any direction in the piston cylinder 20, and meet the pressure and displacement requirements of high-pressure water injection.

[0037] The hydraulic piston pressurized water injection device provided by the embodiment of the present utility model sets the piston cylinder 20 as a combined structure of an upper cylinder body 210, a lower cylinder body 220 and a power cylinder 230, and a single piston 10 is arranged in the piston cylinder 20. The piston 10 is positionally matched with the power cylinder 230 of the piston cylinder 20 to form a first power chamber 2310 and a second power chamber 2320. The hydraulic module 30 is simultaneously communicated with the first power chamber 2310 and the second power chamber 2320, so as to inject hydraulic oil into the first power chamber 2310 and the second power chamber 2320, act on the piston 10 and push the piston 10 to move into the upper cylinder body 210 or the lower cylinder body 220; when the piston 10 moves towards any cylinder body, the corresponding cylinder body space will be compressed, and at the same time, this cylinder body is communicated with the water distribution room 60 to inject high-pressure water into the water distribution room 60, while the space in the other cylinder body will expand and realize water absorption through communication with the water distribution room 60. The above structure can meet the compression and expansion requirements of two cylinder bodies through a single piston 10, and at the same time, the two cylinder bodies both generate action processes during a single movement process. Under the action of the commutation module 40, the piston 10 reciprocates in the piston cylinder 20 and repeats the actions on the two cylinder bodies, so that the hydraulic piston pressurized water injection device can continuously maintain pressurized water injection and reduce the stroke frequency of the piston 10. Similarly, under the same stroke frequency condition, the piston 10 can meet the double pressure and displacement requirements, and the matching structure between the piston 10 and the piston cylinder 20 is simple and mature, with low operation and maintenance costs, improving the operation stability of the hydraulic piston pressurized water injection device.

[0038] Specifically, in some embodiments of the present utility model, the commutation module 40 includes at least a first working position and a second working position, and it should be noted that the commutation module 40 can realize the switching of the supply and return oil paths of the hydraulic module 30 through a reversing valve. Specifically, when the commutation module 40 is in the first working position, the hydraulic oil path of the hydraulic module 30 is that the oil supply pipeline of the hydraulic module 30 is communicated with the first power chamber 2310 to supply oil to the first power chamber 2310. At the same time, the hydraulic oil in the first power chamber 2310 generates pressure on the convex structure on the piston 10, and pushes the piston 10 to move towards the lower cylinder body 220. The return oil pipeline of the hydraulic module 30 is communicated with the second power chamber 2320, and the return oil of the second power chamber 2320 can smoothly reach the hydraulic module 30 and be collected, and meet the smooth movement of the piston 10. During the above process, the cavity space of the upper cylinder body 210 expands, and at the same time, the valve between the upper cylinder body 210 and the water source well 50 is adjusted to a through path, while the valve between the upper cylinder body 210 and the water distribution room 60 is adjusted to an open circuit. The upper cylinder body 210 absorbs water from the water source well 50 through space expansion; at the same time, the space of the lower cylinder body 220 is compressed, and at the same time, the valve between the lower cylinder body 220 and the water source well 50 is adjusted to an open circuit, while the valve between the lower cylinder body 220 and the water distribution room 60 is adjusted to a through path. The lower cylinder body 220 conveys high-pressure water to the water distribution room 60 through compression, and the two cylinder bodies act independently and meet the water absorption and water supply requirements.

[0039] Correspondingly, when the commutation module 40 is in the second working position, the hydraulic oil path of the hydraulic module 30 is that the oil supply pipeline of the hydraulic module 30 is communicated with the second power chamber 2320 to supply oil to the second power chamber 2320. At the same time, the hydraulic oil in the second power chamber 2320 generates pressure on the convex structure on the piston 10, pushing the piston 10 to move towards the upper cylinder block 210. The oil return pipeline of the hydraulic module 30 is communicated with the first power chamber 2310, and the oil return of the first power chamber 2310 can smoothly reach the hydraulic module 30 and be collected, meeting the smooth movement of the piston 10. During this movement process, the cavity space of the lower cylinder block 220 expands. At the same time, the valve between the lower cylinder block 220 and the water source well 50 is adjusted to a passage, and the valve between the lower cylinder block 220 and the water distribution room 60 is adjusted to a cut-off. The lower cylinder block 220 sucks water from the water source well 50 through the expanded space. At the same time, the space of the upper cylinder block 210 is compressed. At the same time, the valve between the upper cylinder block 210 and the water source well 50 is adjusted to a cut-off, and the valve between the upper cylinder block 210 and the water distribution room 60 is adjusted to a passage. The upper cylinder block 210 conveys high-pressure water to the water distribution room 60 through the compression effect. The two cylinder blocks act independently and meet the water absorption and water supply requirements. At the same time, this process cooperates with the working process when the commutation module 40 is in the second working position, so as to realize the respective cyclic actions of the upper cylinder block 210 and the lower cylinder block 220, enabling the hydraulic piston pressurized water injection device to perform water absorption and water supply actions continuously rather than periodically, improving the displacement and continuity of the water injection process.

[0040] In order to further optimize the above technical solution, in some embodiments of the present invention, the piston 10 specifically includes a first piston portion 110 and a second piston portion 120 respectively arranged at both ends thereof. Among them, the first piston portion 110 extends into the cavity of the upper cylinder block 210, and during the movement of the piston 10, the first piston portion 110 always moves within the upper cylinder block 210. At the same time, the outer wall of the first piston portion 110 is attached to the inner wall of the upper cylinder block 210 to seal the upper cylinder block 210 and the power cylinder 230, reducing the leakage risk of the water in the upper cylinder block 210 and the oil in the power cylinder 230. Correspondingly, the second piston portion 120 extends into the cavity of the lower cylinder block 220, and during the movement of the piston 10, the second piston portion 120 always moves within the lower cylinder block 220. The second piston portion 120 also seals the lower cylinder block 220 and the power cylinder 230. It should be noted that by the independent movement of the first piston portion 110 and the second piston portion 120 within the upper cylinder block 210 and the lower cylinder block 220 respectively, the leakage risk of the piston cylinder 20 can be reduced, and the action processes of the two cylinder blocks are independent, reducing the risk of simultaneous failure of the two cylinder blocks.

[0041] Based on the above embodiments, preferably, a sealing ring is recessed at the connection end of the power cylinder 230 and the upper cylinder block 210, and the first piston portion 110 is attached to the inner wall of the sealing ring to achieve a sealing arrangement. The sealing ring can enable the first piston portion 110 to maintain a sliding effect and a sealing state. At the same time, it should be noted that a sealing ring is also preferably provided at the connection end of the power cylinder 230 and the lower cylinder block 220 so that the inner wall of the second piston portion 120 is attached to and sealed with it.

[0042] In addition, the adjustment of the oil supply and return directions of the hydraulic module 30 by the commutation module 40 can be achieved by manual adjustment by an operator or by an automatic control method. In some embodiments of the present invention, the adjustment of the oil supply and return directions of the hydraulic module 30 by the commutation module 40 is achieved by an automatic control method. Specifically, a position sensor is provided inside the cavity of the upper cylinder block 210 to detect the running position of the first piston portion 110 inside the upper cylinder block 210. At the same time, the position sensor is communicatively connected to the commutation module 40 to transmit the position information of the first piston portion 110 inside the upper cylinder block 210 to the commutation module 40 in real time. Specifically, a first sensor and a second sensor can be provided at intervals inside the upper cylinder block 210, and an induction portion for the first sensor and the second sensor to detect is provided on the outer wall of the first piston portion 110. When the first piston portion 110 moves towards the upper cylinder block 210, it will compress the upper cylinder block 210. At the same time, when the first piston portion 110 runs to the upper limit position, that is, when the upper cylinder block 210 is compressed to the limit position, the first sensor detects the induction portion and sends a signal to the commutation module 40. The commutation module 40 switches the oil supply and return directions of the hydraulic module 30, so that the first piston portion 110 moves away from the upper cylinder block 210, and the upper cylinder block 210 enters the expansion stage. Similarly, when the induction portion on the first piston portion 110 runs to the position of the second sensor, the upper cylinder block 210 expands to the limit position, the second sensor detects the induction portion, and sends a signal to the commutation module 40. The commutation module 40 switches the oil supply and return directions of the hydraulic module 30, so that the first piston portion 110 moves towards the upper cylinder block 210 to complete the water absorption and water injection cycle of the upper cylinder block 210.

[0043] It should be noted that sensors can also be provided at intervals on the lower cylinder block 220 to detect the second piston portion 120 and feedback to the commutation module 40 for action. The feedback process is the same as that of the above embodiments and will not be repeated here.

[0044] Furthermore, in the hydraulic piston pressurized water injection device provided by the embodiment of the present utility model, the upper cylinder block 210 is also communicatively provided with a first pipeline for sucking and injecting water into the upper cylinder block 210. Preferably, the communication position of the first pipeline on the upper cylinder block 210 is located at the top of the upper cylinder block 210 to ensure that the water sucking and injecting processes of the upper cylinder block 210 will not be blocked by the piston 10. Specifically, the first pipeline includes a main pipeline 2110, a first branch pipeline 2120, and a second branch pipeline 2130. Among them, the first branch pipeline 2120 is used to connect the main pipeline 2110 and the water source well 50, and a first one-way valve 2140 with a communication direction towards the main pipeline 2110 is provided on the first branch pipeline 2120, that is, the first branch pipeline 2120 is only used for the communication of the water source well 50 to supply liquid to the main pipeline 2110; while the second branch pipeline 2130 connects the main pipeline 2110 and the water distribution room 60, and a second one-way valve 2150 with a communication direction towards the water distribution room 60 is provided on the second branch pipeline 2130. The setting of the main pipeline 2110 simplifies the pipeline outside the upper cylinder block 210, and the first one-way valve 2140 and the second one-way valve 2150 can provide a single-way passage for the liquid flow. Without the need for valve adjustment while meeting the water sucking and injecting of the upper cylinder block 210, it simplifies the adjustment complexity of the operation process of the upper cylinder block 210.

[0045] It should be noted that the above embodiments are specifically described taking the upper cylinder block 210 as an example. The pipeline structure and the setting of the valve structure around the lower cylinder block 220 are the same as those of the upper cylinder block 210, so that the lower cylinder block 220 has the same operation process as the upper cylinder block 210.

[0046] To further optimize the above technical solution, preferably, the first one-way valve 2140 and the second one-way valve 2150 are integrated into a single valve body structure to reduce the installation difficulty. When assembling the hydraulic piston pressurized water injection device, only the integrated structure of the first one-way valve 2140 and the second one-way valve 2150 needs to be fixed, and the first branch pipeline 2120 and the second branch pipeline 2130 are passed through, then the pipeline assembly around the upper cylinder block 210 can be realized, reducing the assembly difficulty and improving the integration degree of the hydraulic piston pressurized water injection device.

[0047] To preliminarily treat the water supply from the water source well 50 and reduce the influence of impurities on the operation stability of the piston 10, in some embodiments of the present utility model, a water supply station is also provided between the water source well 50 and the piston cylinder 20. The water supply station is sequentially provided with a meter 510, a water quality treatment device 520, and a water storage tank 530 along the water flow direction. The water supply from the water source well 50 will be metered, and after removing impurities through the common water treatment process, it is temporarily stored in the water storage tank 530. The upper cylinder block 210 and the lower cylinder block 220 in the piston cylinder 20 directly suck water from the water storage tank 530 when sucking water, avoiding water supply shortage and keeping the water sucking flow continuously controllable.

[0048] Further, as Figure 4 and Figure 5 shown, the embodiment of the present utility model also provides a water injection unit, which includes the hydraulic piston pressurized water injection device 760 provided in any one of the above embodiments. At the same time, it also includes an oil pump unit 710 and a pressure stabilizing energy storage device 720. Among them, the oil pump unit 710 is used to drive the oil in the hydraulic module 30 to run, so as to realize the reciprocating movement of the piston 10 in the piston cylinder 20, and meet the water absorption and water injection actions of the piston cylinder 20. The pressure stabilizing energy storage device 720 is used to dampen and absorb shocks during the operation of the water injection unit, and supplement leaks to maintain pressure stability, thereby improving the operation stability of the water injection unit.

[0049] In addition, it should be noted that the water injection unit also includes an overflow system 730, a cleaning system 740 and a heat dissipation system 750. Among them, the overflow system 730 is used to collect and discharge the leaked liquid during the operation of the piston cylinder 20. It should be noted that there are gaps in the assembly process of the upper cylinder block 210, the power cylinder 230 and the lower cylinder block 220. When there is a problem with the sealing performance between them and the piston 10, water or hydraulic oil will leak during long-term operation. The overflow system 730 is used to collect and discharge the liquid to keep the water injection unit running. The cleaning system 740 is used to flush the pipeline of the water injection unit. The heat dissipation system 750 is arranged around the hydraulic module 30, and is started when the temperature of the hydraulic oil is higher than the set value, and dissipates heat from the hydraulic oil to prevent the hydraulic oil temperature from being too high and affecting the smooth operation of the hydraulic module 30.

[0050] Hereinafter, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0051] The above description is only for the preferred embodiments of the present utility model and the description of the applied technical principles, and is not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. The scope of the utility model involved in the present utility model is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above utility model concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present utility model.

Claims

1. A hydraulic piston pressurized water injection device, characterized in that, Comprising: A piston cylinder, including an upper cylinder block and a lower cylinder block at both ends, and a power cylinder in the middle; A piston, arranged in the piston cylinder to isolate the upper cylinder block and the lower cylinder block, and the power cylinder is hermetically separated into a first power chamber and a second power chamber by the piston; A hydraulic module and a reversing module, the hydraulic module is used to supply hydraulic oil to the first power chamber and the second power chamber to drive the piston to move in the piston cylinder, and the reversing module is used to change the supply and return oil directions of the hydraulic module to change the movement direction of the piston in the piston cylinder; A water source well and a water distribution room, both are connected to the upper cylinder block and the lower cylinder block through pipelines. When the cylinder space of the upper cylinder block and the lower cylinder block is compressed, they are in communication with the water distribution room and cut off from the water source well; when the cylinder space is expanded, they are in communication with the water source well and cut off from the water distribution room.

2. The hydraulic piston pressurized water injection device according to claim 1, characterized in that, The reversing module includes at least a first working position and a second working position. When the reversing module is in the first working position, the hydraulic module supplies oil to the first power chamber and receives the return oil from the second power chamber, and the piston moves towards the lower cylinder block; when the reversing module is in the second working position, the hydraulic module supplies oil to the second power chamber and receives the return oil from the first power chamber, and the piston moves towards the upper cylinder block.

3. The hydraulic piston pressurized water injection device according to claim 1, characterized in that, The piston includes a first piston part and a second piston part arranged at both ends. The first piston part extends into the upper cylinder block and seals the upper cylinder block and the power cylinder; the second piston part extends into the lower cylinder block and seals the lower cylinder block and the power cylinder.

4. The hydraulic piston pressurized water injection device according to claim 3, characterized in that, A sealing ring is recessed at the connection end of the power cylinder and the upper cylinder block, and the first piston part is attached to and sealed with the inner wall of the sealing ring.

5. The hydraulic piston pressurized water injection device according to claim 3, characterized in that, A position sensor is arranged inside the upper cylinder block. The position sensor is used to detect the running position of the first piston part in the upper cylinder block and is communicatively connected to the reversing module. The reversing module changes the supply and return oil directions of the hydraulic module when the first piston part runs to the upper limit position or the lower limit position.

6. The hydraulic piston pressurized water injection device according to claim 1, characterized in that The upper cylinder block is connected with a first pipeline. The first pipeline includes a main pipeline, a first branch pipeline and a second branch pipeline. The first branch pipeline connects the main pipeline and the water source well, and a first one-way valve with a communication direction towards the main pipeline is arranged on the first branch pipeline; the second branch pipeline connects the main pipeline and the water distribution room, and a second one-way valve with a communication direction towards the water distribution room is arranged on the second branch pipeline.

7. The hydraulic piston pressurized water injection device according to claim 6, characterized in that, The first one-way valve and the second one-way valve are integrated on a single valve body structure and arranged at intervals.

8. The hydraulic piston pressurized water injection device according to claim 1, characterized in that, A water supply station is also arranged between the water source well and the piston cylinder. The water supply station is sequentially provided with a meter, a water quality treatment device and a water storage tank along the water flow direction.

9. A water injection unit, characterized in that, Including the hydraulic piston pressurized water injection device according to any one of claims 1-8, further comprising an oil pump unit and a pressure stabilizing energy storage device. The oil pump unit is used to drive the oil fluid in the hydraulic module to run, and the pressure stabilizing energy storage device is used to balance the operating pressure of the hydraulic system.

10. The water injection unit according to claim 9, characterized in that, It also includes an overflow system, a cleaning system and a heat dissipation system. The overflow system is used to collect and discharge the leaked liquid during the operation of the piston cylinder. The cleaning system is used to flush the pipelines of the water injection unit. The heat dissipation system is arranged around the hydraulic module to dissipate heat from the hydraulic oil and lower its temperature.

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