Multi-position rate remotely controllable steam injection valve

Abstract

The present application provides a kind of multi-site rate remote controllable steam injection valve, steam injection valve body is provided with steam injection inner cavity, steam injection inner cavity one end is provided with steam inlet, the other end of steam injection inner cavity is provided with steam injection port;Steam injection inner cavity is provided with steam injection switch structure, steam injection inner cavity is also provided with two-stage steam injection rate adjusting structure corresponding steam injection port;Steam injection valve body is provided with primary steam injection rate adjusting structure.The present application is set by setting steam injection switch structure, based on the control of steam injection gas pressure realizes the opening and closing of remote steam injection valve, simultaneously by setting two-stage steam injection rate adjusting structure, based on the control of steam injection gas pressure realizes the certain control of remote steam injection valve steam injection rate, and by setting primary steam injection rate adjusting structure, based on the control of steam injection temperature realizes the further control of remote steam injection valve steam injection rate;Two-stage steam injection rate adjusting structure cooperates, realizes the remote accurate control of steam injection valve steam injection rate, need not fishing and putting, efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heavy oil exploitation, in particular to a multi-position rate remote controllable steam injection valve. BACKGROUND

[0002] Heavy oil resources include heavy oil, super heavy oil and bitumen. The heavy oil in China is buried at a large depth (mainly between 900-1500 meters) and has a high viscosity, so that a thermal recovery method is mainly used. The heavy oil steam flooding separate layer steam injection technology is an important recovery method in the heavy oil thermal recovery. The steam injection valve is a key component in the separate layer steam injection technology, which is used to inject high pressure and high temperature water vapor into the target storage layer and adjust the steam injection rate, and directly affects the application effect of the separate layer steam injection technology. In reality, due to different reservoir characteristics, classification and formation pressure changes, it is necessary to flexibly adjust the steam injection valve to change the steam injection rate, so as to optimize the recovery effect.

[0003] The commonly used steam injection valves at present include a nozzle type steam injection valve, an eccentric steam injection valve and a ring type adjustable steam injection valve. The nozzle type steam injection valve has a simple structure, so that the failure rate is low, but the steam injection rate is not accurate, and since the steam injection rate is fixed, when the steam injection rate needs to be adjusted with the change of layer depth, the pipe string needs to be stopped, pulled out, replaced with a new valve and then lowered into the wellbore, which needs to stop production for 2-3 days, and is time-consuming and laborious. Restarting after replacement is difficult. The eccentric steam injection valve adjusts the steam distribution rate through an internal mechanism structure, only needs to pull out and replace the internal valve core, does not need to be pulled out completely, and reduces the cost, but the structure is too complex, resulting in a high failure rate, and with the increase of layer depth, the pulling and delivery tool of the valve core is too long, resulting in a very low success rate. The ring type adjustable steam injection valve is the latest product among the three, which improves the accuracy of the steam distribution rate and makes the gas flow smooth, but still needs to be pulled out and delivered for adjusting the steam injection rate, and the efficiency is low. SUMMARY

[0004] In order to solve the problems in the background art, the present application provides a multi-position rate remote controllable steam injection valve.

[0005] A multi-position rate remote controllable steam injection valve, a steam injection inner cavity is arranged in a steam injection valve body, a steam inlet is arranged at one end of the steam injection inner cavity, and a steam injection port is arranged at the other end of the steam injection inner cavity; a steam injection switch structure is arranged in the steam injection inner cavity, and a two-stage steam injection rate adjusting structure is further arranged in the steam injection inner cavity corresponding to the steam injection port; a one-stage steam injection rate adjusting structure is arranged in the steam injection valve body.

[0006] Based on the above, the steam injection switch structure includes a valve core, a first spring, and a first rubber ring, the first rubber ring is arranged in the steam injection inner cavity corresponding to the steam inlet, the bottom of the valve core is movably arranged in the steam injection inner cavity through the first spring, and the bottom of the first spring is connected to the secondary steam injection rate adjusting structure; in the initial state, the first rubber ring is located between the valve core and the wall of the steam injection inner cavity.

[0007] Based on the above, the top of the valve core is provided as a concave arc top surface, and the bottom of the valve core is provided with a spring groove.

[0008] Based on the above, the secondary steam injection rate adjusting structure includes a second spring, a ring-shaped protruding part, and a sealing platform cone, the ring-shaped protruding part is arranged on the cavity wall of the steam injection inner cavity close to the steam inlet end, one end of the second spring is arranged in the steam injection inner cavity close to the steam inlet, the other end of the second spring is arranged at the bottom of the sealing platform cone after penetrating through the ring-shaped protruding part, and the bottom of the first spring is arranged at the top of the sealing platform cone; the diameter of the sealing platform cone is smaller than the inner diameter of the cavity of the steam injection inner cavity and larger than the inner diameter of the ring-shaped protruding part, and the sealing platform cone is separated from the ring-shaped protruding part in the initial state.

[0009] Based on the above, the steam injection valve body includes an inner cylinder and an outer cylinder, the outer cylinder is sleeved outside the inner cylinder, and the steam injection inner cavity is arranged at the center of the inner cylinder; a sandwich cavity is arranged between the inner cylinder and the outer cylinder, and the primary steam injection rate adjusting structure is arranged in the sandwich cavity.

[0010] Based on the above, the primary steam injection rate adjusting structure includes a driving part, a first sealing part, an adjusting part, and a second sealing part arranged in the sandwich cavity respectively, one end of the sandwich cavity close to the steam inlet is provided with a third spring, the driving part presses the third spring through the first sealing part, the adjusting part, and the second sealing part in sequence; the inner cylinder and the outer cylinder are respectively provided with a steam injection hole corresponding to the steam injection inner cavity, and the adjusting part is provided with an adjusting through hole corresponding to the steam injection hole.

[0011] Based on the above, the primary steam injection rate adjusting structure has two levels, and the first level of the primary steam injection rate adjusting structure presses the third spring through the second level of the primary steam injection rate adjusting structure; the inner cylinder and the outer cylinder are respectively provided with the steam injection hole corresponding to the adjusting part in the two levels of the primary steam injection rate adjusting structure.

[0012] Based on the above, the driving part is a heat-sensitive metal sleeve, the first sealing part and the second sealing part are second rubber rings respectively, and the adjusting part is a barrier ring.

[0013] Based on the above, the first spring is arranged at the top of the ring type wheel frame, the fourth spring is arranged at the bottom of the ring type wheel frame, and the bottom of the fourth spring is arranged at the top of the sealing platform cone.

[0014] Based on the above, the two ends of the steam injection valve body are respectively provided with connecting threads.

[0015] The present application has outstanding substantial features and significant progress compared with the prior art. Specifically, the steam injection switch structure is arranged, remote opening and closing of the steam injection valve is realized based on control of steam injection gas pressure, the two-stage steam injection rate adjusting structure is arranged, certain control of steam injection rate of the steam injection valve is realized based on control of steam injection gas pressure, the one-stage steam injection rate adjusting structure is arranged, further control of steam injection rate of the steam injection valve is realized based on control of steam injection temperature, the two-stage steam injection rate adjusting structures are cooperated to realize remote and accurate control of steam injection rate of the steam injection valve, fishing and dropping are not needed, and the efficiency is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present application.

[0017] Figure 2 It is a structural schematic diagram of the valve core of the present application.

[0018] Figure 3 It is a structural schematic diagram of the adjusting member of the present application.

[0019] Figure 4 It is an axial cross-sectional structural schematic diagram of the present application in an initial state.

[0020] Figure 5 It is an axial cross-sectional structural schematic diagram of the present application in a maximum stroke state of the valve core.

[0021] Figure 6 It is an enlarged structural schematic diagram of A1 in the present application. Figure 4

[0022] Figure 7 It is an enlarged structural schematic diagram of A2 in the present application. Figure 5

[0023] Figure 8 It is an enlarged structural schematic diagram of B1 in the present application. Figure 4

[0024] Figure 9 It is an enlarged structural schematic diagram of B2 in the present application. Figure 5

[0025] ​​​​Figure 10 For the present invention Figure 4 Enlarged structural schematic view at C1 in the present invention.

[0026] Figure 11 For the present invention Figure 5 Enlarged structural schematic view at C2 in the present invention.

[0027] Legend: 1. inner cylinder; 2. valve core; 21. concave arc top surface; 22. spring groove; 3. outer cylinder; 4. first rubber ring; 5. driving piece; 6. first spring; 71. first sealing piece; 72. second sealing piece; 81. adjusting piece; 82. adjusting through hole; 9. ring type wheel carrier; 10. fourth spring; 11. sealing platform taper; 12. ring type protruding part; 13. third spring; 14. second spring; 15. shallow steam injection hole; 16. deep steam injection hole; 17. steam injection port; 18. steam inlet. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0029] As Figures 1-11 shown, a multi-position rate remotely controllable steam injection valve, a steam injection inner cavity is arranged in the steam injection valve body, one end of the steam injection inner cavity is provided with a steam inlet 18, the other end of the steam injection inner cavity is provided with a steam injection port 17, both ends of the steam injection valve body are provided with connecting threads, respectively, and both ends are used for connecting upper and lower devices or components. High-temperature and high-pressure steam enters the steam injection inner cavity from the steam inlet 18 and is discharged from the steam injection port 17. A steam injection switch structure is arranged in the steam injection inner cavity, and the steam injection switch is used for opening and closing control of the steam injection valve according to the steam pressure of the injected steam. A two-stage steam injection rate adjusting structure is also arranged in the steam injection inner cavity corresponding to the steam injection port 17, and the two-stage steam injection rate adjusting structure is used for adjusting the steam injection rate according to the steam pressure of the injected steam. At the same time, a one-stage steam injection rate adjusting structure is arranged in the steam injection valve body, and the one-stage steam injection rate adjusting structure is used for adjusting the steam injection rate according to the temperature of the injected steam.

[0030] Specifically, the steam injection switch structure comprises a valve core 2, a first spring 6 and a first rubber ring 4. The first rubber ring 4 is in a cylindrical shape, is arranged in the steam injection inner cavity coaxially corresponding to the steam injection port 18 and the steam injection inner cavity. In reality, a ring-shaped groove is arranged in the steam injection inner cavity corresponding to the first rubber ring 4, and the first rubber ring 4 is arranged in the ring-shaped groove to avoid axial displacement of the first rubber ring 4 relative to the steam injection inner cavity. The inner diameter of the first rubber ring 4 is slightly smaller than the inner diameter of the steam injection inner cavity. For example, the inner diameter of the first rubber ring 4 is 48.7 mm, and the inner diameter of the steam injection inner cavity is 50 mm. The inner diameter of the ring-shaped groove and the outer diameter of the first rubber ring 4 are 61 mm respectively. The valve core 2 is movably arranged in the steam injection inner cavity, and the bottom of the valve core 2 is movably arranged in the steam injection inner cavity by the first spring 6. The diameter of the valve core 2 is smaller than the inner diameter of the steam injection inner cavity, that is, there is a gap between the valve core 2 and the steam injection inner cavity, and the gap is a passage for entering the steam injection valve body. In the embodiment, the outer diameter of the valve core 2 is 48.7 mm. In the initial state, that is, when the first spring 6 is not compressed, the valve core 2 is in the first rubber ring 4. At this time, since the outer diameter of the valve core 2 is equal to the inner diameter of the first rubber ring 4, the valve core 2 is in close contact with the first rubber ring 4, which plays a sealing role on the steam injection inner cavity, that is, the steam injection valve body is in a closed state. When the gas pressure of the injected steam is less than a preset value, the valve core 2 cannot be pressed out of the first rubber ring 4, and the steam has a certain temperature, causing the first rubber ring 4 and the valve core 2 to expand to a certain extent, further forming the effect of closing the valve core 2. When the gas pressure of the injected steam is greater than the preset value, the valve core 2 extrudes the first spring 6 and comes out of the first rubber ring 4. The steam enters the steam injection inner cavity from the gap between the valve core 2 and the steam injection inner cavity, and is discharged from the steam injection port 17. In the embodiment, the first rubber ring 4 is a high-temperature-resistant rubber ring, such as polytetrafluoroethylene. The valve core 2 is a metal valve core 2, such as AISI4140 steel.

[0031] Preferably, the top of the valve core 2 is provided with a concave arc-shaped top surface 21, which is smoothly connected with the side wall of the valve core 2. When the valve core 2 is reset under the action of the first spring 6, it is convenient for the valve core to smoothly enter the first rubber ring 4. The concave arc-shaped top surface is concave at the center position, which is convenient for the gas to provide a downward force on the steam injection valve core, so that the steam injection valve core is easily moved downward. The bottom of the valve core 2 is provided with a spring groove 22 for placing the top end of the first spring 6.

[0032] The secondary steam injection rate adjusting structure comprises a second spring 14, a ring-shaped protruding part 12 and a sealing platform cone 11. The ring-shaped protruding part 12 is coaxially arranged on the cavity wall of the steam injection inner cavity and is close to the steam injection port 17. One end of the second spring 14 is arranged in the steam injection inner cavity close to the steam injection port 17, and the other end of the second spring 14 is arranged at the bottom of the sealing platform cone 11 after passing through the ring-shaped protruding part 12. The diameter of the sealing platform cone 11 is smaller than the inner diameter of the steam injection inner cavity and larger than the inner diameter of the ring-shaped protruding part 12. In the initial state, that is, when the second spring 14 is not compressed, the sealing platform cone 11 is separated from the ring-shaped protruding part 12. At this time, because the diameter of the sealing platform cone 11 is smaller than the inner diameter of the steam injection inner cavity, the steam in the steam injection inner cavity is discharged through the gap between the sealing platform cone 11 and the steam injection inner cavity wall, the middle part of the ring-shaped protruding part 12 and the steam injection port 17. In practice, the bottom of the first spring 6 is arranged at the top of the sealing platform cone 11. When the steam injection pressure increases to a certain value, the steam will squeeze and push the valve core 2 and compress the first spring 6 while entering the steam injection inner cavity. Then the sealing platform cone 11 is moved to the steam injection port 17 direction by the first spring 6, until the sealing platform cone 11 is pressed on the ring-shaped protruding part 12. At this time, the sealing platform cone 11 and the ring-shaped protruding part 12 jointly seal the steam injection inner cavity, and the steam injection port 17 cannot discharge steam.

[0033] The steam injection valve body comprises an inner cylinder 1 and an outer cylinder 3, the outer cylinder 3 is sleeved outside the inner cylinder 1, and the steam injection cavity is arranged at the center of the inner cylinder 1. A sandwich cavity is arranged between the inner cylinder 1 and the outer cylinder 3, and the primary steam injection rate adjusting structure is arranged in the sandwich cavity. The inner cylinder 1 and the outer cylinder 3 are respectively provided with steam injection holes corresponding to the steam injection cavity, and the steam in the steam injection cavity can also be discharged through the steam injection holes. The primary steam injection rate adjusting structure comprises a driving member 5, a first sealing member 71, an adjusting member 81 and a second sealing member 72 arranged in the sandwich cavity respectively, the driving member 5, the first sealing member 71, the adjusting member 81 and the second sealing member 72 are in the form of cylinders and are coaxially arranged with the steam injection cavity. The first sealing member 71 is used for sealing the sandwich cavity to avoid the steam discharged from the oil steam injection hole from contacting the driving member 5; the second sealing member 72 is also used for sealing the sandwich cavity to avoid the steam discharged from the steam injection hole from entering the sandwich cavity close to the steam injection port 17 end. The adjusting member 81 is arranged corresponding to the steam injection hole and is used for plugging the steam injection hole in the normal state; an adjusting through hole 82 is formed in the adjusting member 81 corresponding to the steam injection hole, when the first sealing member 71, the adjusting member 81 and the second sealing member 72 are jointly moved to the steam injection port 17 direction by the driving member 5, the adjusting through hole 82 gradually communicates with the steam injection hole and the opening degree of the steam injection hole increases, so that the steam amount discharged from the steam injection hole per unit time increases, that is, the steam injection rate increases. Similarly, when the adjusting member 81 continues to move to the steam injection port 17 direction, the opening degree of the steam injection hole will decrease, and the steam injection rate will gradually decrease. The end of the sandwich cavity close to the steam injection port 17 is provided with a third spring 13, the driving member 5 abuts against the third spring 13 through the first sealing member 71, the adjusting member 81 and the second sealing member 72 in sequence, and the third spring 13 is used for resetting the primary steam injection rate adjusting structure, that is, when the driving member 5 loses driving force, it is reset under the elastic force of the third spring 13, and the influence of the reset process on the steam injection rate of the steam injection hole is similar to the principle of the above opening process, which will not be described here.

[0034] In reality, in order to avoid that the first spring 6 is too long to affect the use effect, a fourth spring 10 and a ring type wheel frame 9 are further arranged in the steam injection cavity, the bottom of the first spring 6 is arranged at the top of the ring type wheel frame 9, the top of the fourth spring 10 is arranged at the bottom of the ring type wheel frame 9, and the bottom of the fourth spring 10 is arranged at the top of the sealing cone 11. The outer circumferential side of the ring type wheel frame 9 is uniformly distributed with rollers, and the rollers abut against the cavity wall of the steam injection cavity. That is, a long spring is replaced by two relatively short springs, which restricts the degrees of freedom of the first spring 6 and the fourth spring 10, and avoids that the reset spring swings randomly because it is too long.

[0035] In the embodiment, the driving member 5 is a temperature control-based driving member 5, such as a heat-sensitive metal sleeve, the first sealing member 71 and the second sealing member 72 are both second rubber rings, and the adjusting member 81 is a blocking ring. In a normal state, the heat-sensitive metal sleeve is in close contact with the interlayer cavity. By controlling the temperature of the injected steam, the heat-sensitive metal sleeve expands after being heated. Since the heat-sensitive metal sleeve is originally in close contact with the interlayer cavity, the expanded heat-sensitive metal sleeve can only extend in the direction of the steam injection port 17, thereby extruding and pushing the first sealing member 71, and further driving the adjusting member 81 to adjust the opening range of the steam injection hole, thereby achieving temperature control-based adjustment of the steam injection rate. In the embodiment, the material of the heat-sensitive metal sleeve is aluminum alloy, the material of the second rubber ring is graphite packing, and the material of the blocking ring is metal, such as type 25Cr steel.

[0036] The primary steam injection rate adjustment structure and the secondary steam injection rate adjustment structure cooperate with each other to jointly adjust the steam injection rate. The adjustment of the primary steam injection rate adjustment structure is controlled by temperature, while the adjustment of the secondary steam injection rate adjustment structure is controlled by air pressure. The primary steam injection rate adjustment structure and the secondary steam injection rate adjustment structure can be opened simultaneously or only the primary steam injection rate adjustment structure / secondary steam injection rate adjustment structure can be opened. Since the air pressure and the temperature of the injected steam can be controlled on the ground equipment, remote adjustment of the steam injection rate of the steam injection valve can be achieved, and there is no need to fish and drop the steam injection valve or the valve core 2, thereby greatly improving the efficiency and reducing the cost.

[0037] Preferably, the primary steam injection rate adjusting structure has two levels, and the primary steam injection rate adjusting structure at the first level is pressed against the third spring 13 by the primary steam injection rate adjusting structure at the second level. Correspondingly, the inner cylinder 1 and the outer cylinder 3 are respectively provided with the steam injection holes corresponding to the adjusting members 81 in the two levels of the primary steam injection rate adjusting structure. The steam injection holes close to the steam inlet 18 end are shallow layer steam injection holes 15, and the steam injection holes close to the steam outlet 17 end are deep layer steam injection holes 16; in the initial state, the shallow layer steam injection holes 15 are closed, and the deep layer steam injection holes 16 are opened by half. When the steam injection temperature increases, the shallow layer steam injection holes 15 are gradually opened to the maximum and then gradually become smaller until they are closed at the highest temperature; while the deep layer steam injection holes 16 are gradually reduced to be closed and then gradually opened and completely opened at the highest temperature. In reality, the number of the shallow layer steam injection holes 15 and the deep layer steam injection holes 16 can be set as needed, such as two respectively. In the embodiment, the shallow layer steam injection holes 15 and the deep layer steam injection holes 16 have the same size; since the two heat-sensitive metal sleeves are in the same interlayer cavity, they expand at the same time when heated, so the heat-sensitive metal sleeve driving the opening process of the shallow layer steam injection holes 15 is one, and the heat-sensitive sleeve driving the opening process of the deep layer steam injection holes 16 is two, and the opening rate of the deep layer steam injection holes 16 is twice that of the shallow layer steam injection holes 15. With the increase of temperature, the opening process of the shallow layer steam injection holes 15 is from closed to maximum open and then closed, while the opening process of the deep layer steam injection holes 16 is from gradually smaller to closed, then gradually opened and completely opened at the highest temperature. By setting the relative positions of the adjusting members and the adjusting through holes and the steam injection holes in the initial state, the opening degree combination of the shallow layer steam injection holes and the deep layer steam injection holes can be set.

[0038] By jointly adjusting the steam injection rates of the deep layer steam injection holes, the shallow layer steam injection holes, the steam injection port and other parts, the overall adjustment of the steam injection rate is realized. The specific steam injection rate adjustment includes the following processes (in an unnecessary order):

[0039] ①When the injected gas pressure is less than a preset value A such as 6 MPa, the valve core 2 and the first rubber ring 4 are in interference fit, and the injected steam cannot enter the steam injection inner cavity, at which time the steam injection valve body is closed;

[0040] ②When the injected gas pressure is greater than or equal to the preset value A and less than a certain value B, the valve core 2 is completely pressed out of the first rubber ring 4, and the injected gas can enter the steam injection inner cavity; at this time, since the sealing cone 11 is not completely pressed down, the injected gas can not only be injected into the oil layer through the steam injection hole, but also be discharged through the steam outlet 17;

[0041] ③When the temperature of the injected gas becomes larger, the thermal expansion of the heat-sensitive metal sleeve becomes larger, and in the process of becoming larger, the first sealing member 71, the adjusting member 81 and the second sealing member 72 corresponding to the shallow injection steam hole 15 and the deep injection steam hole 16 are pushed to move together in the direction of the injection steam port 17, so that the shallow injection steam hole 15 gradually becomes larger and then gradually becomes smaller, and the deep injection steam hole 16 gradually becomes smaller to be closed and then is opened to the maximum. When the temperature of the injected gas is greater than C, such as 340℃, the shallow injection steam hole 15 is closed and the deep injection steam hole 16 is completely opened.

[0042] ④When the pressure of the injected gas is greater than D, such as 17MPa, the valve core 2 is pressed to the maximum stroke, and the sealing cone 11 is also completely pressed onto the ring-shaped convex part 12, at this time the injected gas cannot be discharged through the injection steam port 17, but can be controlled according to the different temperatures to be discharged from the injection steam hole.

[0043] ⑤When the pressure and / or temperature of the injected gas decreases, the valve core 2, the sealing cone 11 and / or the driving member 5 are restored to the initial position under the restoring force of the spring.

[0044] In reality, by designing the size and relative position of the injection steam port 17, the injection steam hole and the adjusting through hole 82, and according to simulation and experiment under different temperature and pressure conditions, the approximately linear change of the injection steam rate (the combination of the opening and closing or the opening degree of the injection steam port 17, the injection steam hole and / or the adjusting through hole 82) and the corresponding temperature and pressure control conditions of each injection steam rate can be obtained. Therefore, in actual use, according to the required injection steam rate, the corresponding temperature and pressure control conditions can be directly adjusted by looking up the table, and the injection steam rate of the injection steam valve under the well can be remotely controlled, without fishing and putting the injection steam valve or the valve core 2, and the efficiency is greatly improved.

[0045] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A multi-zone rate remotely controllable steam injection valve characterized by: The steam injection valve body is provided with a steam injection inner cavity, one end of the steam injection inner cavity is provided with a steam inlet, and the other end of the steam injection inner cavity is provided with a steam injection port; the steam injection inner cavity is provided with a steam injection switch structure, and the steam injection inner cavity is also provided with a secondary steam injection rate adjusting structure corresponding to the steam injection port; the steam injection valve body is provided with a primary steam injection rate adjusting structure; the steam injection switch structure comprises a valve core, a first spring and a first rubber ring, the first rubber ring is arranged in the steam injection inner cavity corresponding to the steam inlet, the bottom of the valve core is movably arranged in the steam injection inner cavity through the first spring, and the bottom of the first spring is connected with the secondary steam injection rate adjusting structure; in the initial state, the first rubber ring is located between the valve core and the wall of the steam injection inner cavity; the top of the valve core is provided with a concave arc top surface, and the bottom of the valve core is provided with a spring groove; the secondary steam injection rate adjusting structure comprises a second spring, an annular protruding portion and a sealing cone, the annular protruding portion is arranged on the cavity wall of the steam injection inner cavity close to the steam injection port end, one end of the second spring is arranged in the steam injection inner cavity close to the steam injection port, the other end of the second spring is arranged at the bottom of the sealing cone after penetrating out of the annular protruding portion, and the bottom of the first spring is arranged at the top of the sealing cone; the diameter of the sealing cone is smaller than the cavity inner diameter of the steam injection inner cavity and larger than the inner diameter of the annular protruding portion, and the sealing cone is separated from the annular protruding portion in the initial state; the steam injection valve body comprises an inner cylinder and an outer cylinder, the outer cylinder is sleeved outside the inner cylinder, and the steam injection inner cavity is arranged at the center of the inner cylinder; a sandwich cavity is arranged between the inner cylinder and the outer cylinder, and the primary steam injection rate adjusting structure is arranged in the sandwich cavity; the primary steam injection rate adjusting structure comprises a driving member, a first sealing member, an adjusting member and a second sealing member arranged in the sandwich cavity in sequence, one end of the sandwich cavity close to the steam injection port is provided with a third spring, and the driving member abuts against the third spring through the first sealing member, the adjusting member and the second sealing member in sequence; the inner cylinder and the outer cylinder are respectively provided with steam injection holes corresponding to the steam injection inner cavity, and the adjusting member is provided with an adjusting through hole corresponding to the steam injection hole; the primary steam injection rate adjusting structure has two levels, and the first level of the primary steam injection rate adjusting structure abuts against the third spring through the second level of the primary steam injection rate adjusting structure; the inner cylinder and the outer cylinder are respectively provided with the steam injection holes corresponding to the adjusting members in the two levels of the primary steam injection rate adjusting structure.

2. The multi-zone rate remotely controllable steam injection valve according to claim 1, wherein: The driving member is a heat-sensitive metal sleeve, the first sealing member and the second sealing member are second rubber rings, and the adjusting member is a blocking ring.

3. The multi-zone rate remotely controllable steam injection valve of claim 1, wherein: The first spring is arranged at the top of the annular wheel frame, the top of the fourth spring is arranged at the bottom of the annular wheel frame, and the bottom of the fourth spring is arranged at the top of the sealing cone; the outer circumferential side of the annular wheel frame is uniformly distributed with rollers, and the rollers abut against the cavity wall of the steam injection inner cavity.

4. The multi-zone rate remotely controllable steam injection valve of claim 2, wherein: The steam injection valve body is provided with connecting threads at both ends.

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