Modified ethylene glycol fracturing fluid adding device for oil extraction

Abstract

The utility model provides a modified ethylene glycol fracturing fluid adding device for oil extraction. The modified ethylene glycol fracturing fluid adding device comprises a tank body used for containing fracturing fluid, a valve body assembly connected to one side of the tank body, a suction mechanism and a pushing mechanism, wherein the suction mechanism and the pushing mechanism are arranged on the different side faces of the valve body assembly respectively. The valve body assembly comprises a shell and a valve element connected into the shell in a pivoted mode, a first outlet and a second outlet which are vertically communicated are formed in the valve element, and the valve element is driven to rotate in a reciprocating mode so as to be switched between a liquid pumping state and a liquid discharging state. The outer side of the valve element abuts against a scraping part, and the scraping part is driven to scrape along the first outlet or the second outlet and block the first outlet or the second outlet. The fracturing fluid conveying device can cooperate with a high-pressure pump to inject fracturing fluid, the conveying capacity of the fracturing fluid is improved, quantitative and accurate conveying can be achieved, and the fracturing effect is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of oilfield exploitation, and particularly relates to an adding device for modified ethylene glycol fracturing fluid for oil production. Background Art

[0002] The modified ethylene glycol fracturing fluid system is one of the technologies that have received much attention in recent years in oilfield development. Through chemical modification, the performance of ethylene glycol is optimized, enabling it to exhibit excellent sand-carrying capacity and gel-breaking effect in fracturing operations, ensuring the effective filling and support of fractures during the construction process. In addition, this system causes minimal damage to reservoir rocks, helps protect the reservoir and improve oil and gas recovery rate, providing strong support for the efficient development of oilfields.

[0003] The existing modified ethylene glycol-based instant crosslinking fracturing fluid system is prepared by mixing specific chemical components, including 2-acrylamide-2-methylpropanesulfonic acid, methacryloyloxyethyl trimethyl ammonium chloride, modified ethylene glycol aqueous solution, hydroxy acrylic resin, and acrylamide. The preparation process involves mixing these components to form a water-sensitive fracturing fluid system.

[0004] In oilfield exploitation, by adjusting the viscosity of the fracturing fluid, the formation and propagation of fractures can be controlled, thereby affecting the permeability of the oil layer and the recovery rate of crude oil. During the fracturing process, the viscosity of the fracturing fluid needs to be high enough to effectively create fractures and carry sand under high pressure. The traditional method is to inject a liquid with a certain viscosity into the oil layer through a high-pressure large-displacement pump, but this method requires a very large power, and due to the high viscosity of the fracturing fluid, the volume of the fracturing fluid pumped through the pump body is not accurate, and the best fracturing effect cannot be achieved. Summary of the Utility Model

[0005] In view of this, the utility model aims to provide an adding device for modified ethylene glycol fracturing fluid for oil production, which can cooperate with a high-pressure pump to inject the fracturing fluid, improve the conveying capacity of the fracturing fluid, and can accurately convey quantitatively to ensure the fracturing effect.

[0006] To achieve the above object, the technical solution of the utility model is realized as follows:

[0007] An adding device for modified ethylene glycol fracturing fluid for oil production includes a tank body for containing the fracturing fluid, a valve body assembly connected to one side of the tank body, and a suction mechanism and a pushing mechanism respectively arranged on different sides of the valve body assembly;

[0008] The valve body assembly includes a housing and a valve core pivotally connected in the housing, and a first outlet and a second outlet vertically communicating are formed in the valve core;

[0009] The spool is driven to rotate reciprocally to switch between a liquid suction state and a liquid discharge state;

[0010] A scraping part is abutted against the outer side of the spool, and the scraping part is driven to scrape along the first outlet or the second outlet for blocking.

[0011] Furthermore, a receiving cavity is formed in the housing, a first connecting pipe inserted into the receiving cavity is provided on the tank body, a second connecting pipe inserted into the receiving cavity is provided on the suction mechanism, and a third connecting pipe inserted into the receiving cavity is provided on the pushing mechanism;

[0012] When in the liquid suction state, the first connecting pipe and the second connecting pipe are communicated;

[0013] When in the liquid discharge state, the second connecting pipe is communicated with the third connecting pipe;

[0014] The third connecting pipe and the first connecting pipe are oppositely arranged on two sides of the housing.

[0015] Furthermore, at least one end of the spool is provided with an extension shaft, and the extension shaft penetrates through the housing and extends outward;

[0016] A driving mechanism is provided on the tank body, and the driving mechanism includes a first driving part connected to the tank body and a clamping plate connected to the power output end of the first driving part;

[0017] A clamping part is provided on the clamping plate, and the clamping part is used for clamping the extension shaft.

[0018] Furthermore, the suction mechanism includes a second driving part connected to the tank body and a push plate arranged at the power output end of the second driving part;

[0019] At least one first piston part that inserts into or pulls out of the second connecting pipe is provided on the push plate;

[0020] The first piston part includes a first piston rod connected to the push plate and a first piston connected to the first piston rod;

[0021] The diameter of the first piston is adapted to the inner diameter of the second connecting pipe, and when the first piston is driven to move upward, it is in the liquid suction state.

[0022] Furthermore, a connecting plate is provided on the second connecting pipe, and a through hole for the first piston rod to pass through is provided on the connecting plate;

[0023] A guide rod inserted into the connecting plate is further provided on the push plate. When the push plate is driven to move up and down, the guide rod penetrates through the connecting plate.

[0024] Further, a linear bearing is provided on the connecting plate, and the guide rod is inserted into the linear bearing.

[0025] Further, the pushing mechanism includes a third driving part and a second piston part provided at the power output end of the third driving part. The third driving part is fixed on the connecting plate through a support plate.

[0026] The second piston part includes a second piston rod and a second piston connected to the second piston rod.

[0027] A drain pipe is vertically connected to the third connecting pipe, and the drain pipe is communicated with an external high-pressure pump connecting pipe.

[0028] The diameter of the second piston is adapted to the inner diameter of the drain pipe.

[0029] Further, the adding device further includes a fourth driving part for driving the scraping part to slide.

[0030] The fourth driving part is fixedly connected to one side of the housing, and the output shaft of the fourth driving part is concentric with the extension shaft.

[0031] Further, the scraping part includes a swing rod pivotally mounted on the extension shaft, a swing arm sleeved on the power output shaft of the fourth driving part, a pull rod arranged between the swing rod and the swing arm, and a scraping plate abutted against the outer side of the valve core.

[0032] A connecting rod connected to the scraping plate is provided on the swing rod.

[0033] An arc groove is formed on the housing, and the connecting rod is arranged through the arc groove.

[0034] Further, the two valve body assemblies, the pushing mechanism, and the suction mechanism are arranged on the tank body.

[0035] Compared with the prior art, the present utility model has the following advantages:

[0036] For the modified ethylene glycol fracturing fluid adding device for oil production of the present utility model, by providing a suction mechanism, the fracturing fluid stored in the tank can be quantitatively extracted. The scraping of the scraping part can avoid the defect of inaccurate suction volume caused by the viscosity of the fracturing fluid, and improve the fracturing effect. Also, by providing a rotating valve core, after extracting a quantitative amount of fracturing fluid, the pushing mechanism pushes the fracturing fluid onto the infusion pipe connected to the high-pressure pump, providing a certain pre-pressure for the injection of the fracturing fluid, thereby reducing the conveying pressure of the high-pressure pump, avoiding the overload output of the high-pressure pump, and ensuring the smooth implementation of the fracturing work.

[0037] In addition, by providing the first driving part and the clamping plate, the clamping plate is used to clamp the extension shaft. When the power output end of the first driving part extends or contracts, it drives the extension shaft and the valve core to rotate together. With such a setting, the structure is simple, the installation is convenient, and it is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0039] Figure 1 is a schematic three-dimensional structure view of the first perspective of the modified ethylene glycol fracturing fluid adding device for oil production according to the embodiment of the present utility model;

[0040] Figure 2 is a schematic three-dimensional structure view of the second perspective of the modified ethylene glycol fracturing fluid adding device for oil production according to the embodiment of the present utility model;

[0041] Figure 3 is a schematic three-dimensional structure view of the third perspective of the modified ethylene glycol fracturing fluid adding device for oil production according to the embodiment of the present utility model;

[0042] Figure 4 is Figure 2 the partial enlarged view at I in

[0043] Figure 5 is a schematic connection view of the clamping plate and the extension shaft according to the embodiment of the present utility model;

[0044] Figure 6 is a schematic structure view of the first outlet and the second outlet of the valve core according to the embodiment of the present utility model.

[0045] Description of the reference numerals:

[0046] 1, tank body; 2, valve body assembly; 3, suction mechanism; 4, pushing mechanism; 5, scraping part; 6, first connecting pipe; 7, second connecting pipe; 8, third connecting pipe; 9, driving mechanism; 10, connecting plate; 11, guide rod; 12, drain pipe; 13, fourth driving part;

[0047] 201, housing; 202, valve core; 203, first outlet; 204, second outlet;

[0048] 301, second driving part; 302, push plate; 303, first piston part;

[0049] 401, third driving part; 402, second piston part;

[0050] 501, swing rod; 502, swing arm; 503, pull rod;

[0051] 901. First driving part; 902. Clamping plate;

[0052] 2011. Arc groove;

[0053] 2021. Extension shaft;

[0054] 9021. Clamping part. Detailed implementation manner

[0055] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0056] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "back", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0057] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with the specific situations.

[0058] The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0059] This embodiment relates to a modified ethylene glycol fracturing fluid adding device for oil production. The modified ethylene glycol fracturing fluid adding device for oil production includes a tank body 1 for containing fracturing fluid, a valve body assembly 2 connected to one side of the tank body 1, and a suction mechanism 3 and a pushing mechanism 4 respectively arranged on different sides of the valve body assembly 2.

[0060] Among them, the valve body assembly 2 includes a housing 201 and a valve core 202 pivotally connected inside the housing 201. A first outlet 203 and a second outlet 204 that are vertically communicated are formed inside the valve core 202. The valve core 202 is driven to rotate reciprocally to switch between a liquid suction state and a liquid discharge state. A scraping part 5 is abutted against the outside of the valve core 202, and the scraping part 5 is driven to scrape along the first outlet 203 or the second outlet 204 and perform plugging.

[0061] The modified ethylene glycol fracturing fluid adding device for oil production described in this embodiment can quantitatively extract the fracturing fluid stored in the tank body 1 through the suction mechanism 3, and avoid the defect of inaccurate suction volume caused by the viscosity of the fracturing fluid through the scraping of the scraping part 5, thereby improving the fracturing effect. By setting the rotating valve core 202, after extracting a certain amount of fracturing fluid, the fracturing fluid is pushed to the infusion pipe connected to the high-pressure pump through the pushing mechanism 4, providing a certain pre-pressure for the injection of the fracturing fluid, thus reducing the conveying pressure of the high-pressure pump, avoiding the overload output of the high-pressure pump, and ensuring the smooth implementation of the fracturing work.

[0062] Based on the above overall introduction, an exemplary structure of the modified ethylene glycol fracturing fluid adding device for oil production in this embodiment is as Figures 1 to 3 shown. The tank body 1 is used to hold the modified ethylene glycol fracturing fluid. In the traditional fracturing fluid conveying method, the conveying pipe connected to the high-pressure pump is directly inserted into the tank body 1, and the capacity of the fracturing fluid is controlled by the opening and closing of the stop valve. Therefore, the conveying volume of the fracturing fluid is an approximate value and accurate quantitative conveying cannot be achieved.

[0063] As a preferred embodiment, still as Figures 1 to 3 shown, a receiving cavity is formed in the housing 201. The tank body 1 is provided with a first connecting pipe 6 inserted into the receiving cavity, the suction mechanism 3 is provided with a second connecting pipe 7 inserted into the receiving cavity, and the pushing mechanism 4 is provided with a third connecting pipe 8 inserted into the receiving cavity. When in the liquid suction state, the first connecting pipe 6 and the second connecting pipe 7 are communicated. When in the liquid discharging state, the second connecting pipe 7 and the third connecting pipe 8 are communicated. The third connecting pipe 8 and the first connecting pipe 6 are relatively arranged on both sides of the housing 201.

[0064] Specifically, still as Figures 1 to 3 shown, an elbow is provided below the tank body 1, and the elbow is connected to the first connecting pipe 6. The first connecting pipe 6, the second connecting pipe 7, and the third connecting pipe 8 all penetrate the housing 201 and are inserted into the receiving cavity and correspond to the position of the first outlet 203 or the second outlet 204. The housing 201 of this embodiment is formed into a rectangular frame structure, and the valve core 202 is cylindrical and is arranged in the middle of the housing 201 and is lapped in the housing 201 through the following extension shaft 2021.

[0065] As Figure 6 shown, the first outlet 203 and the second outlet 204 are blind holes inserted radially from the outside to the inside along the valve core 202. The first outlet 203 and the second outlet 204 are communicated with each other. When the valve core 202 is driven to rotate, the first outlet 203 and the second outlet 204 are respectively communicated with the first connecting pipe 6 and the second connecting pipe 7 to be in the liquid suction state, and then the second connecting pipe 7 and the third connecting pipe 8 are communicated to be in the liquid discharging state.

[0066] Furthermore, still as Figures 1 to 3As shown, at least one end of the valve core 202 is provided with an extension shaft 2021, and the extension shaft 2021 penetrates through the housing 201 and extends outward. A driving mechanism 9 is provided on the tank body 1. The driving mechanism 9 includes a first driving part 901 connected to the tank body 1, and a clamping plate 902 connected to the power output end of the first driving part 901. A clamping part 9021 is provided on the clamping plate 902, and the clamping part 9021 is used for clamping the extension shaft 2021.

[0067] As Figures 1 to 3 shown, the extension shaft 2021 is cylindrical. One end of the clamping plate 902 has a through hole into which the piston rod of the first driving part 901 penetrates, and is fixed by a setscrew or a nut. As Figure 5 shown, the clamping part 9021 includes a round hole for the extension shaft 2021 to penetrate through, and a slotted opening with one end open. The slotted opening is communicated with the round hole. After the extension shaft 2021 penetrates through, a screw penetrates through the slotted opening, and both ends of the slotted opening are clamped to lock the extension shaft 2021.

[0068] In this embodiment, the first driving part 901 adopts a telescopic cylinder. By providing the first driving part 901 and the clamping plate 902, the clamping plate 902 is used for clamping the extension shaft 2021. When the power output end of the first driving part 901 extends or contracts, it drives the extension shaft 2021 to rotate together with the valve core 202. With such a setting, the structure is simple, the installation is convenient, and it is easy to implement.

[0069] As Figures 1 to 3 shown, the suction mechanism 3 includes a second driving part 301 connected to the tank body 1, and a push plate 302 provided at the power output end of the second driving part 301. At least one first piston part 303 that inserts into or pulls out of the second connecting pipe 7 is provided on the push plate 302. The first piston part 303 includes a first piston rod connected to the push plate 302, and a first piston connected to the first piston rod. The diameter of the first piston is adapted to the inner diameter of the second connecting pipe 7. When the first piston is driven to move upward, it is in a liquid suction state.

[0070] Furthermore, still as Figures 1 to 3 shown, a connecting plate 10 is provided on the second connecting pipe 7, and a through hole for the first piston rod to pass through is provided on the connecting plate 10. A guide rod 11 inserted on the connecting plate 10 is also provided on the push plate 302. When the push plate 302 is driven to move up and down, the guide rod 11 penetrates through the connecting plate 10. By providing the guide rod 11, the stability of the first piston part 303 during liquid suction can be increased. Because the fracturing fluid has a high viscosity, the second driving part 301 in this embodiment adopts a hydraulic cylinder, which further ensures the liquid suction stability and ensures the capacity accuracy of the fracturing fluid extraction.

[0071] Preferably, a linear bearing is provided on the connecting plate 10 of this embodiment, and the guide rod 11 is inserted into the linear bearing. Such a setting can increase the sliding smoothness between the guide rod 11 and the connecting plate 10, and avoid jamming, which may affect the extraction of fracturing fluid.

[0072] In addition, as Figures 1 to 3 shown, the pushing mechanism 4 includes a third driving part 401, a second piston part 402 provided at the power output end of the third driving part 401. The third driving part 401 is fixed on the connecting plate 10 through a support plate. The second piston part 402 includes a second piston rod and a second piston connected to the second piston rod. A drain pipe 12 is vertically connected to the third connecting pipe 8, and the drain pipe 12 is communicated with an external high-pressure pump connecting pipe. The diameter of the second piston is adapted to the inner diameter of the drain pipe 12.

[0073] In terms of specific structure, still as Figures 1 to 3 shown, the third driving part 401 is also preferably a hydraulic cylinder to increase the drainage stability. The diameter of the third driving part 401 is selected according to the required pressure. Through the drainage pressure of the third driving part 401 and the extraction force of the high-pressure pump, the fracturing fluid is transported together, thus avoiding the overload of the high-pressure pump and ensuring the smoothness of the fracturing process. In this embodiment, the inner diameter and outer shape of the drain pipe 12 can be set according to the required drainage capacity or the docking requirements with the conveying pipe, which will not be elaborated here.

[0074] In addition, the modified ethylene glycol fracturing fluid adding device for oil production of this embodiment further includes a fourth driving part 13 for driving the scraping part 5 to slide. The fourth driving part 13 is fixedly connected to one side of the housing 201, and the output shaft of the fourth driving part 13 is concentric with the extension shaft 2021.

[0075] Specifically, as Figure 2 and Figure 4 shown, the fourth driving part 13 is fixed to one side of the housing 201 through a support. The fourth driving part 13 is a rotary motor. A deep groove ball bearing is sleeved outside the output shaft of the fourth driving part 13 and inserted into the extension shaft 2021 to ensure concentricity of the two.

[0076] Still as Figure 2 and Figure 4As shown, the scraping part 5 includes a swing rod 501 pivotally mounted on the extension shaft 2021, a swing arm 502 sleeved on the power output shaft of the fourth driving part 13, a pull rod 503 arranged between the swing rod 501 and the swing arm 502, and a scraping plate abutted against the outer side of the valve core 202. A connecting rod connected to the scraping plate is provided on the swing rod 501. An arc groove 2011 is formed on the housing 201, and the connecting rod is arranged through the arc groove 2011. In this embodiment, the scraping plate is an arc plate arranged on the outer side of the valve core 202, and its inner diameter is the same as the outer diameter of the valve core 202, which is not shown in the drawings. The arc length of the arc plate is sufficient to block the first outlet 203 or the second outlet 204.

[0077] As Figure 4 shown, the swing rod 501 and the extension shaft 2021 are connected by a deep groove ball bearing. When the fourth driving part 13 drives the swing arm 502 to rotate, the connecting rod drives the swing rod 501 to rotate together, thereby driving the scraping plate abutted against the outer side of the valve core 202 to rotate along the outer diameter of the valve core 202, so as to realize scraping the viscous fracturing fluid and blocking the first outlet 203 or the second outlet 204. In this embodiment, through the suction or pushing action between the first piston part 303 and the second connecting pipe 7, and between the second piston part 402 and the third connecting pipe 8, the volume of the fracturing fluid to be transported can be obtained by calculation, improving the accurate control of the fracturing fluid volume and ensuring a better fracturing effect.

[0078] To increase the transportation efficiency, as Figures 1 to 3 shown, two valve body assemblies 2, a pushing mechanism 4, and a suction mechanism 3 are arranged on the tank body 1. Of course, the number of the above components can be adaptively adjusted according to actual production needs and is not limited herein.

[0079] The modified ethylene glycol fracturing fluid adding device for oil production in this embodiment can cooperate with a high-pressure pump to inject the fracturing fluid, improve the transportation capacity of the fracturing fluid, and can accurately transport quantitatively to ensure the fracturing effect.

[0080] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A modified ethylene glycol fracturing fluid adding device for oil production, characterized in that: It comprises a tank body (1) for containing fracturing fluid, a valve body assembly (2) connected to one side of the tank body (1), and a suction mechanism (3) and a pushing mechanism (4) respectively arranged on different sides of the valve body assembly (2); The valve body assembly (2) comprises a housing (201), and a valve core (202) pivotally connected inside the housing (201); a first outlet (203) and a second outlet (204) which are vertically connected are formed inside the valve core (202); The valve core (202) is driven to rotate reciprocatingly to switch between a liquid pumping state and a liquid discharging state; A scraping portion (5) is abutted against the outer side of the valve core (202), and the scraping portion (5) is driven to scrape along the first outlet (203) or the second outlet (204) to perform blocking.

2. The modified ethylene glycol fracturing fluid adding device for oil production according to claim 1, characterized in that: A receiving cavity is formed in the shell (201), a first connecting tube (6) inserted into the receiving cavity is provided on the tank body (1), a second connecting tube (7) inserted into the receiving cavity is provided on the suction mechanism (3), and a third connecting tube (8) inserted into the receiving cavity is provided on the pushing mechanism (4); When in the liquid pumping state, the first connecting pipe (6) and the second connecting pipe (7) are connected; When in the liquid discharge state, the second connecting pipe (7) is connected to the third connecting pipe (8); The third connecting pipe (8) and the first connecting pipe (6) are arranged on two sides of the housing (201) opposite to each other.

3. The modified ethylene glycol fracturing fluid adding device for oil production according to claim 2, characterized in that: At least one end of the valve core (202) is provided with an extension shaft (2021), and the extension shaft (2021) penetrates the housing (201) and extends outward; The tank body (1) is provided with a driving mechanism (9), the driving mechanism (9) comprising a first driving part (901) connected to the tank body (1), and a clamping plate (902) connected to a power output end of the first driving part (901); The clamping plate (902) is provided with a clamping portion (9021), and the clamping portion (9021) is used to clamp the extension shaft (2021).

4. The modified ethylene glycol fracturing fluid adding device for oil production according to claim 3, characterized in that: The suction mechanism (3) comprises a second driving part (301) connected to the tank body (1), and a push plate (302) provided at a power output end of the second driving part (301); The push plate (302) is provided with at least one first piston portion (303) which is inserted into or pulled out of the second connecting pipe (7); The first piston part (303) comprises a first piston rod connected to the push plate (302), and a first piston connected to the first piston rod; The diameter of the first piston is matched to the inner diameter of the second connecting tube (7), and the first piston is in a liquid pumping state when being driven to move upward.

5. The modified ethylene glycol fracturing fluid adding device for oil production according to claim 4, characterized in that: The second connecting pipe (7) is provided with a connecting plate (10), and the connecting plate (10) is provided with a through hole for the first piston rod to pass through; The push plate (302) is also provided with a guide rod (11) inserted into the connecting plate (10); when the push plate (302) is driven to move up and down, the guide rod (11) passes through the connecting plate (10).

6. The modified ethylene glycol fracturing fluid adding device for oil production according to claim 5, characterized in that: A linear bearing is provided on the connecting plate (10), and the guide rod (11) is inserted into the linear bearing.

7. The modified ethylene glycol fracturing fluid adding device for oil production according to claim 6, characterized in that: The pushing mechanism (4) comprises a third driving part (401) and a second piston part (402) provided at a power output end of the third driving part (401); the third driving part (401) is fixed to the connecting plate (10) via a supporting plate; The second piston part (402) comprises a second piston rod and a second piston connected to the second piston rod; The third connecting pipe (8) is vertically connected to a liquid discharge pipe (12), and the liquid discharge pipe (12) is in communication with an external high-pressure pump connecting pipe; The diameter of the second piston is matched to the inner diameter of the discharge pipe (12).

8. The modified ethylene glycol fracturing fluid adding device for oil production according to claim 3, characterized in that: The adding device further comprises a fourth driving part (13) for driving the scraping part (5) to slide; The fourth driving part (13) is fixedly connected to one side of the housing (201), and the output shaft of the fourth driving part (13) is arranged concentrically with the extension shaft (2021).

9. The modified ethylene glycol fracturing fluid adding device for oil production according to claim 8, characterized in that: The scraping part (5) comprises a swing rod (501) pivotable on the extension shaft (2021), a swing arm (502) sleeved on the power output shaft of the fourth driving part (13), a pull rod (503) arranged between the swing rod (501) and the swing arm (502), and a scraper abutting against the outer side of the valve core (202); The swing rod (501) is provided with a connecting rod connected to the scraper; A circular arc groove (2011) is formed on the shell (201), and the connecting rod is arranged to penetrate the circular arc groove (2011).

10. The modified ethylene glycol fracturing fluid adding device for oil production according to any one of claims 1 to 9, characterized in that: The two valve body assemblies (2), the pushing mechanism (4), and the suction mechanism (3) are arranged on the tank body (1).

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