Oilfield chemical agent mixed injection device

Abstract

The utility model relates to the technical field of oil field chemical agent injection, in particular to an oil field chemical agent mixed injection device. The device comprises a shell, a feeding part, a stirring part, a liquid discharging part and a discharging part. The shell comprises a main body and an arc-shaped partition plate, and the arc-shaped partition plate divides an inner cavity of the main body into a mixing bin and a temporary storage bin. The feeding part comprises a liquid inlet pipe assembly and a medicine inlet pipe assembly. The stirring part is arranged in the mixing bin. And the liquid discharging part is arranged at the bottom of the arc-shaped partition plate and can selectively communicate with the mixing bin and the temporary storage bin. And the discharging part comprises a discharging pipe. According to the device, after a chemical agent and a solvent are effectively mixed, mixed liquid can be continuously injected into a well, the situation that the concentration of the chemical agent fluctuates is effectively avoided, and the using effect of the chemical agent is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of oilfield chemical agent injection, in particular to an oilfield chemical agent mixing injection device. Background Art

[0002] In the process of adding chemicals to oil fields, it is often necessary to use a dosing pump to inject functional chemicals for oil and water wells into the oil and water wells in proportion, so as to achieve the purpose of anti-corrosion and anti-scaling, sterilization and viscosity reduction of the oil and water wells.

[0003] The utility model patent with application number CN201922068226.6 discloses a continuous chemical injection device for oil and water wells. The device monitors the liquid level information in the dosing tank in real time through a liquid level controller. The detected liquid level information is sent to each control point through a control box, thereby realizing automatic replenishment of chemicals and adjustment of the stirring speed of the stirring device, realizing the automation of the device and greatly improving its utilization efficiency.

[0004] However, in production applications, it takes a certain amount of time to add chemicals and water to the dosing tank. During the process of adding chemicals and water, the concentration of chemicals inside the dosing tank will change, affecting the use effect, which has certain disadvantages. Utility Model Content

[0005] In order to solve part or all of the problems existing in the prior art, the utility model provides an oilfield chemical agent mixing injection device.

[0006] The oilfield chemical agent mixing injection device comprises:

[0007] The shell comprises a main body configured as a cavity structure, and an arc-shaped partition disposed inside the main body, wherein the arc-shaped partition is configured to separate the inner cavity of the main body into a mixing chamber at an upper portion and a buffer chamber at a lower portion;

[0008] A feeding part, comprising a liquid inlet pipe assembly and a drug inlet pipe assembly, which are arranged on the upper part of the shell and are configured to communicate with the mixing chamber;

[0009] A stirring portion, at least partially disposed inside the mixing bin;

[0010] a liquid drain portion, configured to be disposed at the bottom of the arc-shaped partition and capable of selectively connecting the mixing chamber and the buffer chamber; and

[0011] The discharging part includes a discharging pipe disposed at the lower end of the housing and configured to communicate with the buffer bin.

[0012] Among them, the stirring part is constructed to stir the solvent and chemical agent introduced by the liquid inlet pipe assembly and the drug inlet pipe assembly respectively to produce a mixed liquid, and the discharge part is constructed to selectively discharge the mixed liquid into the buffer bin so that the mixed liquid can flow into the dosing pump through the discharge part.

[0013] As an extension of the above technical solution, the present invention further improves the following embodiments:

[0014] The liquid discharge portion includes a fixed cylinder configured to be connected to the arc-shaped partition, and a telescopic mechanism arranged inside the fixed cylinder with a gap left between the fixed cylinder and the inner wall of the fixed cylinder, and a first through hole is opened on the upper end surface of the fixed cylinder. The telescopic mechanism is configured to be able to close or open the first through hole through telescopic movement to selectively connect the mixing chamber and the cache chamber.

[0015] The telescopic mechanism includes a protective tube with a second through hole on the upper end surface, an electromagnet fixedly arranged inside the protective tube, and a first plug constructed to be able to pass through the first through hole and the second through hole, and a first iron sheet is arranged at the lower end of the first through hole, and a first spring is connected between the first iron sheet and the electromagnet.

[0016] A third through hole is formed on the lower end surface of the fixing tube, and the telescopic mechanism is configured to close or open the third through hole through telescopic movement.

[0017] A fourth through hole is opened on the lower end surface of the protective tube, and the telescopic mechanism includes a second plug capable of passing through the third through hole and the fourth through hole, a second iron sheet arranged on the upper end of the second plug, and a second spring arranged between the second iron sheet and the electromagnet.

[0018] A stirring portion is also provided inside the buffer bin.

[0019] The stirring part includes a motor installed outside the main body, a stirring shaft configured to be connected to the motor and rotatably connected to the side wall of the main body, and a stirring blade fixedly installed on the stirring shaft.

[0020] An auxiliary pipe assembly is arranged on the main body, and the auxiliary pipe assembly includes an auxiliary pipe configured to be connected with both the mixing bin and the buffer bin, and an auxiliary valve installed on the auxiliary pipe.

[0021] A liquid level meter is installed on the inner wall of the buffer bin.

[0022] A PLC controller is installed on the main body, and the PLC controller is configured to receive a liquid level signal sent by the liquid level meter and automatically control the feed part, the stirring part, the drainage part and the discharge part to achieve the addition, mixing and injection of chemicals and solvents.

[0023] The advantages of the utility model compared to the prior art are:

[0024] By dividing the interior of the main body into a mixing chamber and a buffer chamber, and providing a stirring part, a drainage part and other components inside the main body, uniform mixing of chemicals and solvents and continuous injection of the mixed liquid after uniform mixing are achieved, effectively avoiding fluctuations in the concentration of chemicals added to the well and ensuring the use effect of the chemicals. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The schematic diagram is a structural diagram showing the internal structure of the oilfield chemical mixing injection device according to the utility model;

[0026] Figure 2 It is a three-dimensional structural schematic diagram of the oilfield chemical agent mixing injection device according to the utility model from one viewing angle;

[0027] Figure 3 It is a three-dimensional structural schematic diagram of the oilfield chemical agent mixing injection device according to the utility model from another perspective;

[0028] Figure 4 The utility model is a schematic diagram of the cross-sectional structure of the liquid discharge part of the oilfield chemical mixing injection device.

[0029] All drawings in the present invention are schematic diagrams for illustrating structures and principles, and are not necessarily drawn according to actual sizes and proportions.

[0030] The specific meanings of the reference numerals in the figures are as follows:

[0031] 1. Shell; 11. Main body; 111. Mixing chamber; 112. Buffer chamber; 12. Arc partition; 2. Feeding part; 21. Liquid inlet pipe assembly; 211. Liquid inlet pipe; 212. Liquid inlet valve; 213. Liquid inlet flow meter; 22. Drug inlet pipe assembly; 221. Drug inlet pipe; 222. Drug inlet valve; 223. Drug inlet flow meter; 23. Chemical agent barrel; 3. Stirring part; 31. Motor; 32. Stirring shaft; 33. Stirring blade; 34. Connecting rod; 4. Draining part; 41. Fixed cylinder; 411. First through hole; 412. Third through hole Hole; 42, telescopic mechanism; 421, protective tube; 4211, second through hole; 4212, fourth through hole; 422, electromagnet; 423, first plug; 424, first iron sheet; 425, first spring; 426, second plug; 427, second iron sheet; 428, second spring; 429, positioning rod; 5, discharge part; 51, discharge pipe; 52, discharge valve; 6, auxiliary pipe assembly; 61, auxiliary pipe; 62, auxiliary valve; 7, liquid level meter; 8, PLC controller; 100, oilfield chemical mixing injection device. DETAILED DESCRIPTION

[0032] The embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings.

[0033] Figures 1 to 3 The figure is a schematic diagram of the relevant structure of the oilfield chemical mixing and injection device 100 according to the utility model. As shown in the figure, the oilfield chemical mixing and injection device 100 includes a shell 1, a feed part 2, a stirring part 3, a liquid discharge part 4 and a discharge part 5. The shell 1 includes a main body 11 and an arc-shaped partition 12. The main body 11 is configured as a cavity structure. The arc-shaped partition 12 is arranged inside the main body 11, and the arc-shaped partition 12 is also configured to separate the inner cavity of the main body 11 into a mixing chamber 11 at the upper part and a buffer chamber 112 at the lower part. The feed part 2 includes a liquid inlet pipe assembly 21 and a drug inlet pipe assembly 22. The liquid inlet pipe assembly 21 and the drug inlet pipe assembly 22 are both arranged at the upper part of the shell 1 and are configured to be connected with the mixing chamber 111. The liquid inlet pipe assembly 21 is used to introduce a solvent (water or other liquids) into the mixing chamber 111, and the drug inlet pipe assembly 22 is used to introduce a chemical agent into the mixing chamber 111. The stirring part 3 is configured to be at least partially arranged inside the mixing chamber 111. The liquid discharge part 4 is configured to be disposed at the bottom of the arc-shaped partition 12 and can selectively connect the mixing chamber 111 and the buffer chamber 112. The material discharge part 5 includes a material discharge pipe 51, which is disposed at the lower end of the housing 1 and is configured to be connected to the buffer chamber 112. In addition, the stirring part 3 is configured to stir the solvent and chemical agent introduced into the mixing chamber 111 by the liquid inlet pipe assembly 21 and the drug inlet pipe assembly 22 to produce a mixed liquid of the two, and the liquid discharge part 4 is configured to discharge the mixed liquid into the buffer chamber 112, so that the mixed liquid can flow into the dosing pump of the well through the material discharge pipe 51.

[0034] During the specific operation, the staff respectively introduces the solvent and the chemical agent into the interior of the mixing chamber 111 through the liquid inlet pipe assembly 21 and the drug inlet pipe assembly 22, and then opens the stirring section 3 to stir the solvent and the chemical agent to produce a mixed liquid of the two. After the two are stirred evenly, the staff opens the drainage section 4 so that the drainage section 4 connects the mixing chamber 111 with the buffer chamber 112, and the evenly mixed mixed liquid flows from the mixing chamber 111 to the buffer chamber 112 through the drainage section 4. The mixed liquid in the buffer chamber 112 then flows out of the oilfield chemical agent mixing injection device 100 through the liquid outlet pipe 51 and flows into the dosing pump of the well to complete the function of adding chemical agents to the well. The above process is repeated continuously to ensure that the liquid level inside the buffer chamber 112 is maintained within a certain height range, so as to achieve the purpose of continuously injecting chemical agents into the well.

[0035] This design achieves uniform mixing of chemicals and solvents and continuous injection of the mixed liquid, effectively avoiding fluctuations in the concentration of chemicals added to the well and ensuring the effectiveness of the chemicals.

[0036] like Figure 1 As shown, in some embodiments of the utility model, the liquid inlet pipe assembly 21 includes a liquid inlet pipe 211, and a liquid inlet valve 212 and a liquid inlet flowmeter 213 arranged on the liquid inlet pipe 211. Through this design, it is convenient for the staff to effectively and accurately control whether the solvent needs to be introduced and the amount of the introduced solvent according to production needs, thereby improving the controllability, accuracy and work efficiency of the injection operation.

[0037] Preferably, in order to facilitate automatic control of the liquid inlet valve 212, the liquid inlet valve 212 is a solenoid valve.

[0038] like Figure 1 As shown, in some embodiments of the utility model, the drug inlet pipe assembly 22 includes a drug inlet pipe 221, and a drug inlet valve 222 and a drug inlet flow meter 223 arranged on the drug inlet pipe 221. Through this design, it is convenient for the staff to effectively and accurately control whether it is necessary to introduce chemical agents and the amount of the introduced chemical agents according to production needs, thereby improving the controllability, accuracy and work efficiency of the injection operation.

[0039] Preferably, in order to facilitate automatic control of the medicine inlet valve 222, the medicine inlet valve 222 is a solenoid valve.

[0040] like Figure 1 As shown, in some embodiments of the present invention, a chemical barrel 23 for temporarily storing chemical agents is installed on the top of the main body 11 , and the chemical barrel 23 is configured to be connected to the drug inlet pipe 221 .

[0041] like Figure 1 As shown, in some embodiments of the utility model, no less than two chemical barrels 23 are arranged on the top of the main body 11, and accordingly, the same number of drug inlet pipe assemblies 22 as the chemical barrels 23 are also arranged on the main body 11, and the drug inlet pipe assemblies 22 and the chemical barrels 23 are constructed in a one-to-one corresponding manner.

[0042] Preferably, the number of chemical agent barrels 23 and the number of drug inlet pipe assemblies 22 are both two.

[0043] like Figure 2 As shown, in some embodiments of the present invention, in order to facilitate the control of the discharge pipe 51 , the discharge portion 5 includes a discharge valve 52 disposed on the discharge pipe 51 .

[0044] Preferably, in order to facilitate automatic control of the discharge valve 52, the discharge valve 52 is a solenoid valve.

[0045] like Figure 1 and Figure 4 As shown, in some embodiments of the utility model, the discharge part 4 includes a fixed cylinder 41 and a telescopic mechanism 42. The fixed cylinder 41 is configured to be connected to the bottom of the arc-shaped partition 12, and the telescopic mechanism 42 is arranged inside the fixed cylinder 41 in a manner of leaving a gap between the fixed cylinder 41 and the inner wall. A first through hole 411 is provided on the upper end surface of the fixed cylinder 41, and the lower end of the fixed cylinder 41 is configured to be connected to the buffer chamber 112. In the absence of other components blocking, the first through hole 411 connects the fixed cylinder 41 with the mixing chamber 111. The telescopic structure 42 is also configured to be able to close or open the first through hole 411 through its own telescopic movement to selectively connect the mixing chamber 111 and the buffer chamber 112. Through this design, the structure of the discharge part 4 is clarified, and the technical effect of using the discharge part 4 to selectively connect the mixing chamber 111 and the buffer chamber 112 is achieved, which improves the reliable structural guarantee for the realization of the function of the oilfield chemical mixing injection device 100.

[0046] Furthermore, if Figure 1 and Figure 4As shown, in some embodiments of the utility model, the telescopic mechanism 42 includes a protective tube 421 with a second through hole 4211 on the upper end surface, an electromagnet 422 fixedly arranged inside the protective tube 421, and a first plug 423 configured to penetrate the first through hole 411 and the second through hole 4211. A first iron sheet 424 is fixedly connected and arranged at the lower end of the first plug 423, and a first spring 425 is connected and arranged between the first iron sheet 424 and the electromagnet 422. In addition, the protective tube 421 is integrally constructed as a waterproof structure to protect the electromagnet 422 inside it. During specific operations, when the mixing bin 111 and the buffer bin 112 do not need to be connected, the electromagnet 422 is placed in a non-magnetic state of power off, and the first plug 423, supported by the elastic force of the first spring 425, is in a state of penetrating the first through hole 411 and the second through hole 4211 to close the first through hole 411. After the chemical agent and solvent in the mixing chamber 111 are mixed, when the mixed liquid needs to be introduced into the buffer chamber 112, the electromagnet 422 is energized to generate magnetism, and the electromagnet 422 will attract the first iron sheet 424 at the lower end of the first plug 423 to move downward. Since the first iron sheet 424 and the first plug 423 are in a fixed connection state, the first plug 423 also moves downward due to the driving effect of the first iron sheet 424, thereby separating from the first through hole 411, that is, the mixing chamber 111 and the buffer chamber 112 are connected through the first through hole 411 and the open lower end structure of the fixed cylinder 41. At this time, the mixed liquid of the chemical agent and the solvent can flow into the interior of the buffer chamber 112 through the gap between the telescopic mechanism 42 and the inner wall of the fixed cylinder 41, and flow into the dosing pump of the well through the liquid outlet pipe 51. After the dosing is completed, the staff only needs to cut off the power supply of the electromagnet 422, so that the first plug 423 moves upward, and the first through hole 411 is blocked again to complete the isolation of the mixing chamber 111 and the buffer chamber 112. Through this design, the structure of the telescopic mechanism 42 is clarified, and the technical effect of selectively connecting the mixing chamber 111 and the buffer chamber 112 by combining the telescopic mechanism 42 with the fixed cylinder 41 is achieved, which improves the reliable structural guarantee for the realization of the function of the oilfield chemical mixing injection device 100.

[0047] Furthermore, if Figure 1 and Figure 4As shown, in some embodiments of the present invention, a third through hole 412 is provided on the lower end surface of the fixed cylinder 41, and the telescopic structure 42 is also configured to be able to close or open the third through hole 412 through its own telescopic movement. Through this design, the mixed liquid in the mixing chamber 111 can only flow into the buffer chamber 112 through the fixed cylinder 41 when both the first through hole 411 and the third through hole 412 are opened, thereby improving the control ability of the staff over the flow of the mixed liquid, reducing the probability that the chemical agents in the mixing chamber 111 flow into the buffer chamber 112 without being evenly mixed, and ensuring the stability of the chemical agent concentration in the buffer chamber 112.

[0048] Furthermore, if Figure 1 and Figure 4As shown, in some embodiments of the present invention, a fourth through hole 4212 is provided on the lower end surface of the protective tube 421, and the telescopic mechanism 42 further includes a second plug 426 capable of penetrating the third through hole 412 and the fourth through hole 4212, a second iron sheet 427 fixedly connected to the upper end of the second plug 426, and a second spring 428 disposed between the second iron sheet 427 and the electromagnet 422. In specific operation, when the mixing bin 111 and the buffer bin 112 do not need to be connected, the electromagnet 422 is placed in a non-magnetic state of power failure, and the first plug 423 and the second plug 426 are respectively supported by the elastic force of the first spring 425 and the second spring 428, and are respectively in a state of penetrating the first through hole 411 and the second through hole 4211, the third through hole 412 and the fourth through hole 4212 to close the first through hole 411 and the third through hole 412. After the chemical agent and solvent in the mixing chamber 111 are mixed, when the mixed liquid needs to be introduced into the buffer chamber 112, the electromagnet 422 is energized to generate magnetism, and the electromagnet 422 attracts the first iron sheet 424 at the lower end of the first plug 423 and the second iron sheet 427 at the lower end of the second plug 426 to move downward and upward respectively. Since the first iron sheet 424 and the first plug 423, and the second iron sheet 427 and the second plug 426 are in a fixed connection state, the first plug 423 and the second plug 426 will also move downward and upward respectively due to the driving effect of the first iron sheet 424 and the second iron sheet 427, so as to separate from the first through hole 411 and the third through hole 412 respectively, so that the mixing chamber 111 and the buffer chamber 112 are connected through the first through hole 411 and the third through hole 412 on the fixed cylinder 41. At this time, the mixed liquid of chemical agent and solvent can flow into the interior of buffer chamber 112 through drainage component 4, and flow into the dosing pump of the well through liquid outlet pipe 51. After the dosing is completed, the staff only needs to cut off the power of electromagnet 422, so that the first plug 423 and the second plug 426 move upward and downward respectively, and the first through hole 411 and the third through hole 412 are blocked again to complete the isolation of mixing chamber 111 and buffer chamber 112. Through this design, the structure of telescopic mechanism 42 is clarified, and the technical effect of using telescopic mechanism 42 in combination with fixed cylinder 41 to selectively connect mixing chamber 111 and buffer chamber 112, as well as setting a two-stage "control switch" for drainage part 4 is realized, which improves the reliable structural guarantee for the realization of the function of oilfield chemical mixing injection device 100.

[0049] like Figure 4As shown, in some embodiments of the present invention, the telescopic mechanism 42 is connected to the inner wall of the fixed cylinder 41 through the positioning rod 429. Through this design, only a few positioning rods 429 are needed to realize the fixed connection between the telescopic mechanism 42 and the fixed cylinder 41, and a gap can be maintained between the telescopic structure 42 and the inner wall of the fixed cylinder 41 for the mixed liquid to flow, which has the advantages of convenient manufacturing and good economy.

[0050] like Figure 1 As shown, in some embodiments of the present invention, a stirring part 3 is also provided inside the buffer chamber 112. Through this design, the evenly mixed mixed liquid flowing into the buffer chamber 112 through the mixing chamber 111 can be stirred for a second time in the buffer chamber 112, thereby maintaining the evenly mixed state of the chemical agent and the solvent, and further ensuring the uniformity and stability of the concentration of the chemical agent flowing into the well.

[0051] like Figure 1 As shown, in some embodiments of the utility model, the stirring part 3 includes a motor 31, a stirring shaft 32 and a stirring blade 33. The motor 31 is installed on the outside of the main body 11 close to the outer wall of the main body 11, and the output shaft (not shown) of the motor 31 is inserted into the inside of the main body 11. The stirring shaft 32 is arranged inside the main body 11, and is configured to be connected to the output shaft of the motor 31 through one end, and is rotatably connected to the side wall of the main body 11 so that the motor 31 can drive it to rotate. A stirring blade 33 is fixedly mounted on the stirring shaft 32 to better achieve the stirring of the chemical agent and the solvent. Through this design, the specific structure of the stirring part 3 is clarified, which helps to improve the uniformity of mixing the chemical agent and the solvent, and provides a reliable structural basis for the realization of the function of the oilfield chemical mixing injection device 100.

[0052] Preferably, if Figure 1 As shown, in some embodiments of the present invention, the stirring part 3 includes a connecting rod 34, and the stirring blade 33 is configured to be connected to the stirring shaft 32 through the connecting rod 34. This design helps to achieve a fixed connection between the stirring shaft 32 and the stirring blade 33, thereby ensuring the structural stability of the stirring part 3.

[0053] like Figure 1 and Figure 2As shown, in some embodiments of the utility model, an auxiliary pipe assembly 6 is provided on the main body 11. The auxiliary pipe assembly 6 includes an auxiliary pipe 61 and an auxiliary valve 62. The auxiliary pipe 61 is configured to be connected to both the mixing bin 111 and the buffer bin 112, and the auxiliary valve 62 is installed on the auxiliary pipe 61. In general, the auxiliary valve 62 is in a closed state to keep the mixing bin 111 and the buffer bin 112 in a normal connected or disconnected state. When the drain part 4 fails, the staff can open the auxiliary valve 62, and the mixed liquid in the mixing bin 111 can flow into the buffer bin 112 through the auxiliary pipe 61, thereby ensuring the continuity of the chemical injection.

[0054] Preferably, the auxiliary valve 62 is a manual valve.

[0055] like Figure 1 As shown, in some embodiments of the present invention, a liquid level meter 7 is installed on the inner wall of the buffer bin 112. The liquid level meter 7 is configured to be able to show the height of the liquid level inside the buffer bin 112, and to transmit the information to the corresponding data acquisition and control system, so that the control system or the staff can grasp the liquid level of the mixed liquid inside the buffer bin 112 in real time, so that when the liquid level inside the buffer bin 112 is lower than the set value, the control system or the staff can timely use the oilfield chemical agent mixing and injection device 100 to perform the addition, mixing and injection of chemicals and solvents, thereby ensuring the continuity of chemical agent injection.

[0056] like Figure 2 and Figure 3 As shown, in some embodiments of the utility model, a PLC controller 8 is installed on the main body 11. And the PLC controller 8 is constructed to receive the liquid level signal sent by the liquid level meter 7, and when the liquid level inside the buffer bin 112 monitored by the liquid level meter 7 is lower than the set value, the feed part 2, the stirring part 3, the drainage part 4 and the discharge part 5 are automatically controlled to achieve the addition, mixing and injection of chemical agents and solvents. The PLC controller 8 is also constructed to automatically stop the operation of the feed part 2, the stirring part 3 and the drainage part 4 when the liquid level inside the buffer bin 112 monitored by the liquid level meter 7 reaches another higher set value to prevent the mixed liquid in the buffer bin 112 from being overloaded. Through this design, the automatic operation level of the oilfield chemical mixing and injection device 100 is improved, the need for human intervention is reduced, and good economic benefits can be generated. In addition, the specific principle and structure of the PLC controller are known to those skilled in the art and will not be described in detail here.

[0057] According to the oilfield chemical agent mixing and injection device 100 of the utility model, by dividing the interior of the main body 11 into a mixing chamber 111 and a buffer chamber 112, and arranging components such as a stirring part 3 and a liquid discharge part 4 inside the main body 11, uniform mixing of chemical agents and solvents and continuous injection of the uniformly mixed mixed liquid are achieved, effectively avoiding the concentration fluctuation of chemical agents and ensuring the use effect of chemical agents. In addition, the device also has the advantages of reasonable design and compact structure, and has good application prospects in this field.

[0058] In the present invention, the specific meanings of the terms "upper", "lower", "inner", "outer", "middle", "side" and the like when indicating directions are as follows: Figure 1 The drawing state of the chemical mixing injection device 100 in the oil field is used as a reference.

[0059] Finally, it should be noted that although the present invention has been described in detail with reference to the preferred embodiments, various improvements may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An oilfield chemical mixing injection device, characterized in that: include: A shell (1) comprises a main body (11) configured as a cavity structure, and an arc-shaped partition (12) arranged inside the main body (11), wherein the arc-shaped partition (12) is configured to separate the inner cavity of the main body (11) into a mixing chamber (111) at an upper portion and a buffer chamber (112) at a lower portion; A feeding part (2), comprising a liquid inlet pipe assembly (21) and a drug inlet pipe assembly (22) which are arranged on the upper part of the housing (1) and are configured to communicate with the mixing chamber (111); A stirring portion (3) is at least partially disposed inside the mixing chamber (111); A liquid discharge portion (4) configured to be disposed at the bottom of the arc-shaped partition (12) and capable of selectively connecting the mixing chamber (111) and the buffer chamber (112); as well as A discharge portion (5) comprising a discharge pipe (51) disposed at the lower end of the housing (1) and configured to communicate with the buffer bin (112), The stirring portion (3) is configured to stir the solvent and chemical agent introduced by the liquid inlet pipe assembly (21) and the drug inlet pipe assembly (22) respectively to produce a mixed liquid, and the liquid discharge portion (4) is configured to selectively discharge the mixed liquid into the buffer chamber (112) so that the mixed liquid can flow into the dosing pump via the discharge portion (5).

2. The oilfield chemical mixing injection device according to claim 1, characterized in that: The liquid discharge portion (4) comprises a fixed cylinder (41) configured to be connected to the arc-shaped partition plate (12), and a telescopic mechanism (42) arranged inside the fixed cylinder (41) with a gap between the fixed cylinder (41) and the inner wall thereof, wherein a first through hole (411) is provided on the upper end surface of the fixed cylinder (41), and the telescopic mechanism (42) is configured to be able to close or open the first through hole (411) through a telescopic movement so as to selectively connect the mixing chamber (111) and the buffer chamber (112).

3. The oilfield chemical mixing injection device according to claim 2, characterized in that: The telescopic mechanism (42) comprises a protective tube (421) having a second through hole (4211) formed on the upper end surface, an electromagnet (422) fixedly arranged inside the protective tube (421), and a first plug (423) configured to pass through the first through hole (411) and the second through hole (4211), and a first iron sheet (424) is arranged at the lower end of the first plug (423), and a first spring (425) is connected between the first iron sheet (424) and the electromagnet (422).

4. The oilfield chemical mixing injection device according to claim 3, characterized in that: A third through hole (412) is provided on the lower end surface of the fixed cylinder (41), and the telescopic mechanism (42) is configured to be able to close or open the third through hole (412) through telescopic movement.

5. The oilfield chemical mixing injection device according to claim 4, characterized in that: A fourth through hole (4212) is provided on the lower end surface of the protective tube (421), and the telescopic mechanism (42) includes a second plug (426) capable of passing through the third through hole (412) and the fourth through hole (4212), a second iron sheet (427) arranged at the upper end of the second plug (426), and a second spring (428) arranged between the second iron sheet (427) and the electromagnet (422).

6. The oilfield chemical mixing injection device according to any one of claims 1 to 5, characterized in that: A stirring portion (3) is also provided inside the buffer chamber (112).

7. The oilfield chemical mixing injection device according to claim 6, characterized in that: The stirring portion (3) comprises a motor (31) mounted outside the main body (11), a stirring shaft (32) configured to be connected to the motor (31) and rotatably connected to the side wall of the main body (11), and a stirring blade (33) fixedly mounted on the stirring shaft (32).

8. The oilfield chemical mixing injection device according to claim 7, characterized in that: An auxiliary pipe assembly (6) is provided on the main body (11), and the auxiliary pipe assembly (6) comprises an auxiliary pipe (61) configured to be in communication with both the mixing bin (111) and the buffer bin (112), and an auxiliary valve (62) installed on the auxiliary pipe (61).

9. The oilfield chemical mixing injection device according to claim 8, characterized in that: A liquid level meter (7) is installed on the inner wall of the buffer bin (112).

10. The oilfield chemical mixing injection device according to claim 9, characterized in that: A PLC controller (8) is installed on the main body (11). The PLC controller (8) is configured to receive a liquid level signal sent by the liquid level meter (7) and automatically control the feed section (2), the stirring section (3), the discharge section (4) and the discharge section (5) to achieve the addition, mixing and injection of chemicals and solvents.

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