Water control device for high-water-content horizontal well treatment

Abstract

The invention belongs to the technical field of horizontal well water control, and relates to a water control device for high-water-content horizontal well treatment. An accommodating hole is formed in a flow channel of the valve body, and the oil-water detector is mounted in the accommodating hole of the valve body; the valve element is suitable for blocking the containing hole, and the second through hole of the valve element is suitable for being communicated with the containing hole of the valve body. When the external liquid phase pressure of the water control pipe is too high, the oil-water detector is used for detecting whether the liquid phase is oil liquid or water liquid, so that whether the liquid phase pressure of the horizontal well is too high due to the fact that water cones or bottom water enters the horizontal well or not is judged conveniently, and the horizontal well is subjected to corresponding treatment in an auxiliary and matched mode on the basis of water control; when the pressure of the liquid phase is normal, the valve element blocks the containing hole of the valve body, and the liquid phase does not make contact with the oil-water detector at the moment, so that the oil-water detector is protected, and the service life is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of horizontal well water control, and in particular, relates to a water control device for treating a high water-content horizontal well. Background Art

[0002] As the name suggests, horizontal wells are a different type of well compared to vertical wells. In some special cases, horizontal wells are needed. For example, the oil reservoir is on the shallow seabed, but the layer of offshore platform construction is too high, so drilling a well from land can be considered. For another example, some oil reservoirs are thin, and a horizontal well can be drilled to increase the contact area between the wellbore and the formation, thereby improving production efficiency.

[0003] With the increase in demand for oil resources and the continuous improvement of horizontal well technology, the application of horizontal wells in oil and gas field development has become more and more common, and related research has also deepened.

[0004] In the production process, water production from horizontal wells is a common problem, especially for bottom water reservoirs. Once bottom water enters the horizontal well, the water content in the well will increase rapidly, thus affecting economic benefits and recovery rate, and the management of horizontal wells in the high water content period becomes more complicated.

[0005] In addition, due to the pressure difference between different production sections, some production sections have higher production, while other production sections have lower production. At the same time, this pressure difference will also cause mutual influence between production sections. High-pressure areas may inhibit the production of low-pressure areas, and even cause liquid reflux, which makes the actual production of horizontal wells far lower than the sum of the production of each independent section.

[0006] If a particular section maintains a high fluid production state for a long time, the possibility of water production in that section will increase. As the water production increases, the contradiction between sections will become more prominent, the pressure in the overall system will gradually rise, and the water content of the oil well will increase accordingly, until it reaches a state of complete flooding. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a water control device for treating a high water content horizontal well.

[0008] In order to solve the above technical problems, the present invention provides a water control device for high water content horizontal well management, comprising: a water control pipe for communicating with an oil pipe; a water control valve for controlling liquid phase pressure, installed on the side wall of the water control pipe; the water control valve comprises: a valve body installed on the side wall of the water control pipe, a flow channel is provided on the valve body, the head end of the valve body flow channel leads to the outside of the water control pipe, and the tail end of the valve body flow channel leads to the inside of the water control pipe; a valve core, movably arranged on the valve body, the valve core is suitable for blocking the head and tail ends of the valve body flow channel; a supply valve is connected between the valve core and the valve body. A spring for returning the sliding valve core; a first through hole is penetrated on the valve core, and the first through hole of the valve core is suitable for communicating with the flow channel of the valve body; the valve core also has a second through hole communicating with the first through hole, and the second through hole of the valve core is connected between the first through hole and the head end of the flow channel of the valve body; an oil-water detector, a receiving hole is opened on the flow channel of the valve body, and the oil-water detector is installed in the receiving hole of the valve body, and the oil-water detector can be a density meter, an optical sensor or a conductivity sensor; the valve core is suitable for blocking the receiving hole, and the second through hole of the valve core is suitable for communicating with the receiving hole of the valve body.

[0009] Preferably, the first end of the valve core is located in the flow channel of the valve body, and the first through hole and the second through hole of the valve core are both located at the first end of the valve core; the second end of the valve core is located inside the water control pipe.

[0010] Preferably, a sand-proof screen is installed at the head end of the valve body flow channel, and the sand-proof screen is suitable for being removed from the valve body.

[0011] Preferably, the second end of the valve core is an arc-shaped abutment sheet, and the second end of the valve core protrudes toward the center of the water control pipe.

[0012] Preferably, the first through hole and the second through hole of the valve core are stacked in the sliding direction of the valve core, and the first through hole and the second through hole of the valve core extend in an intersecting direction; a groove connecting the intersection of the first through hole and the second through hole is opened on the valve core, and the groove of the valve core is connected to the head end of the valve body flow channel.

[0013] Preferably, it also includes: a motor installed inside the side wall of the water control pipe, the output shaft of the motor rotates and passes through the water control pipe, and the output shaft of the motor extends to the inside of the water control pipe; a baffle plate connected to the output shaft of the motor, and the baffle plate is suitable for clamping the second end of the valve core.

[0014] Preferably, it further comprises: a slant plate connected to the output shaft of the motor, wherein the slant plate is suitable for squeezing the second end of the valve core.

[0015] Preferably, it also includes: a sealing guide ring installed on the valve body; a rod-shaped structure sliding through the sealing guide ring is connected between the first end and the second end of the valve core; a limit sleeve surrounding the valve core rod-shaped structure is connected to the sealing guide ring, and the limit sleeve is used to limit the sliding distance of the first end of the valve core.

[0016] Preferably, the water control pipe has an upper connection end and a lower connection end, the upper connection end of the water control pipe is close to the head end of the oil pipe, and the lower connection end of the water control pipe is close to the tail end of the oil pipe; the motor is located between the upper connection end of the water control pipe and the water control valve.

[0017] The present invention overcomes the shortcomings of the prior art and can achieve the following beneficial effects: 1. When the external liquid phase pressure of the water control pipe is too high, the oil-water detector is used to detect whether the liquid phase is oil or water, so as to judge whether water cone occurs in the horizontal well or bottom water enters the horizontal well, resulting in excessive liquid phase pressure, so as to assist in the corresponding treatment of the horizontal well on the basis of water control; when the liquid phase pressure is normal, the valve core blocks the receiving hole of the valve body, and the liquid phase does not contact the oil-water detector, thereby protecting the oil-water detector and prolonging its service life.

[0018] 2. When the external liquid phase pressure of the water control pipe is too high, if the oil-water detector detects that the liquid phase is water, the servo motor is controlled to drive the baffle to rotate and get stuck to the second end of the valve core. At this time, the first end of the valve core cannot be reset and moved. Therefore, active control of water flow can be achieved on the basis of pressure control. Even if the subsequent liquid phase pressure decreases, water can be completely prevented from being sucked in.

[0019] 3. When the external liquid phase pressure of the water control pipe is too high, if the oil-water detector detects that the liquid phase is oil, the servo motor can be controlled to drive the inclined plate to rotate and squeeze the second end of the valve core, and the first through hole of the valve core gradually connects to the flow channel of the valve body, so that the oil can be sucked in at a relatively small pressure, thereby controlling the production of the horizontal well, and the oil-water detector will continue to detect the liquid phase. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the assembly of a horizontal well in the prior art and the present invention.

[0021] Figure 2 It is a schematic diagram of the water control pipe and the water control valve of the present invention.

[0022] Figure 3 It is a cross-sectional view of the water control pipe of the present invention.

[0023] Figure 4 It is a cross-sectional view of the valve body of the present invention.

[0024] Figure 5It is a front view of the valve body of the present invention.

[0025] Figure 6 For the present invention Figure 2 AA direction cross-sectional view.

[0026] Figure 7 It is a schematic diagram of the valve core of the present invention, wherein the first end of the valve core is fully cut away.

[0027] Figure 8 It is a schematic diagram of the use status of the inclined plate and the valve core of the present invention.

[0028] Fig. 9 It is a schematic diagram of the motor, baffle and inclined plate of the present invention.

[0029] Fig.10 It is a schematic diagram of the state of the valve core when the external liquid pressure of the water control pipe is too low.

[0030] The markings in the accompanying drawings are: 1-oil pipe, 11-well casing, 12-perforation section, 10-thread plug, 2-packer, 3-water control pipe, 31-upper connection end, 32-lower connection end, 4-water control valve, 41-valve body, 411-flow channel, 4111-head end of flow channel, 4112-tail end of flow channel, 412-accommodating groove, 42-valve core, 421-first through hole, 422-second through hole, 423-groove, 43-spring, 44-oil-water detector, 51-motor, 52-baffle, 53-inclined plate, 61-sealing guide ring, 62-limiting sleeve. DETAILED DESCRIPTION

[0031] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0032] In addition, the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. It should be noted that the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] It should be explained that when the present invention is applied to horizontal wells, Figure 1-10As shown, the wellbore casing 11 is arranged along the wellbore of the horizontal well, the head end of the oil pipe 1 is sucked through the pump body, and the thread plug 10 is installed at the tail end of the oil pipe 1. The water control pipe 3 is installed between two adjacent packers 2 on the oil pipe 1 through the upper connecting end 31 and the lower connecting end 32 of the water control pipe 3, and the upper connecting end 31 of the water control pipe 3 is close to the head end of the oil pipe 1, and the lower connecting end 32 of the water control pipe 3 is close to the tail end of the oil pipe 1. There is a corresponding perforation section 12 on the oil pipe 1 between each two adjacent packers 2, that is, each perforation section 12 corresponds to a water control pipe 3, so as to reduce the mutual influence between the liquid production sections.

[0034] The present invention provides a water control device for treating a high water content horizontal well, such as Figure 1-Figure 7 As shown, it includes: a water control pipe 3 for communicating with the oil pipe 1, controlling the pump body to extract the liquid phase in the water control pipe 3 from the horizontal well through the oil pipe 1; a water control valve 4 for controlling the liquid phase pressure, installed on the side wall of the water control pipe 3, when the external liquid phase pressure of the water control pipe 3 is too high, the water control valve 4 prevents the liquid phase from flowing into the water control pipe 3 through the water control valve 4, and when the external liquid phase pressure of the water control pipe 3 is too low, the water control valve 4 prevents the liquid phase from flowing out of the water control pipe 3 through the water control valve 4 The water control valve 4 includes: a valve body 41 installed on the side wall of the water control pipe 3, a flow channel 411 is provided on the valve body 41, a head end 4111 of the flow channel 411 of the valve body 41 leads to the outside of the water control pipe 3, and a tail end of the flow channel 411 of the valve body 41 leads to the inside of the water control pipe 3, so that the liquid phase enters through the head end 4111 of the flow channel 411 of the valve body 41, and then flows out through the tail end of the flow channel 411 of the valve body 41. The end is discharged to the interior of the water control pipe 3; the valve core 42 is movably arranged on the valve body 41, and the valve core 42 is suitable for blocking the head and tail ends of the flow channel 411 of the valve body 41. The pressure generated by the liquid phase circulating outside and inside the water control pipe 3 will squeeze the valve core 42 to move between the head and tail ends of the flow channel 411; a spring 43 for returning the sliding valve core 42 is connected between the valve core 42 and the valve body 41; a first through hole 421 is penetrated by the valve core 42, when the liquid phase pressure is normal, that is, the normal liquid phase pressure is equal to the pressure setting pressure difference of the oil pipe 1, the first through hole 421 of the valve core 42 is suitable for communicating with the flow channel 411 of the valve body 41, when the external liquid phase pressure of the water control pipe 3 is too high, the liquid phase circulating outside the water control pipe 3 will squeeze the valve core 42 close to the water control pipe 3, at this time, the first through hole 421 of the valve core 42 is disconnected from the flow channel 411 of the valve body 41, such as Figure 5 As shown, the liquid phase cannot continue to circulate, thereby controlling the output of the high-pressure section; when the liquid phase pressure outside the water control pipe 3 is too low, the liquid phase circulating inside the water control pipe 3 will squeeze the valve core 42 away from the water control pipe 3, as shown in FIG. Fig.10As shown, at this time, the first through hole 421 of the valve core 42 is disconnected from the flow channel 411 of the valve body 41, and the liquid phase cannot continue to flow, thereby avoiding the backflow of the liquid phase in the water control pipe 3; the valve core 42 also has a second through hole 422 connected to the first through hole 421, and the second through hole 422 of the valve core 42 is connected between the first through hole 421 and the head end 4111 of the flow channel 411 of the valve body 41, and the liquid phase at normal pressure passes through the flow channel 411 of the valve body 41. The oil enters from the head end 4111, and passes through the second through hole 422 of the valve core 42, the first through hole 421 and the tail end of the flow channel 411 of the valve body 41 in sequence, and then is discharged to the inside of the water control pipe 3; the oil-water detector 44, the flow channel 411 of the valve body 41 is provided with a receiving hole, and the oil-water detector 44 is installed in the receiving hole of the valve body 41. When the external liquid phase pressure of the water control pipe 3 is too high, the oil-water detector 44 is used to detect whether the liquid phase is oil or water, so as to facilitate the judgment of water Whether water cone occurs in the horizontal well or bottom water enters the horizontal well, resulting in excessive liquid phase pressure, so as to assist in the corresponding treatment of the horizontal well on the basis of water control. The oil-water detector 44 can be a density meter, an optical sensor or a conductivity sensor. In this embodiment, the oil-water detector 44 is an optical sensor; the valve core 42 is suitable for blocking the accommodating hole, and the second through hole 422 of the valve core 42 is suitable for communicating with the accommodating hole of the valve body 41. When the liquid phase pressure is normal, the valve core 42 blocks the accommodating hole of the valve body 41. At this time, the liquid phase does not contact the oil-water detector 44, thereby protecting the oil-water detector 44 and improving its service life. When the external liquid phase pressure of the water control pipe 3 is too high, the valve core 42 is close to the water control pipe 3, which will make the second through hole 422 communicate with the accommodating hole of the valve body 41, so that when the liquid phase pressure is too high, the oil-water detector 44 automatically detects the liquid phase flowing into the second through hole 422 from the outside of the water control pipe 3, with high synchronization.

[0035] like Figure 5 and Figure 7 As shown, the first end of the valve core 42 is located in the flow channel 411 of the valve body 41. When the external liquid pressure of the water control pipe 3 is too high, the liquid flowing outside the water control pipe 3 will squeeze the first end of the valve core 42 close to the water control pipe 3. The first through hole 421 and the second through hole 422 of the valve core 42 are both located at the first end of the valve core 42. The second end of the valve core 42 is located inside the water control pipe 3. When the external liquid pressure of the water control pipe 3 is too low, the liquid flowing inside the water control pipe 3 will squeeze the second end of the valve core 42 away from the water control pipe 3.

[0036] like Figure 5 As shown, a sand-proof screen is installed at the head end 4111 of the flow channel 411 of the valve body 41 to prevent particles from blocking the first through hole 421 and the second through hole 422 . The sand-proof screen is suitable for being removed from the valve body 41 .

[0037] like Figure 7 As shown, the second end of the valve core 42 is an arc-shaped abutment sheet, and the second end of the valve core 42 protrudes toward the center of the water control pipe 3. The protruding structure is used to increase the contact area of ​​the liquid phase to ensure the driving of the valve core 42.

[0038] like Figure 5 and Figure 7 As shown, the first through hole 421 and the second through hole 422 of the valve core 42 are stacked in the sliding direction of the valve core 42, and the first through hole 421 and the second through hole 422 of the valve core 42 extend in a cross direction, so that when the liquid phase pressure is normal, the first through hole 421 of the crossed first through hole 421 and the second through hole 422 will not guide the liquid phase to the oil-water detector 44 in the accommodating groove 412 of the valve body 41; the valve core 42 is provided with a first through hole 421 to guide the liquid phase to the oil-water detector 44 in the accommodating groove 412 of the valve body 41; 21 is connected to the groove 423 at the intersection of the second through hole 422, and the groove 423 of the valve core 42 is connected to the head end 4111 of the flow channel 411 of the valve body 41. The liquid phase outside the water control pipe 3 will flow from the groove 423 of the valve core 42 into the second through hole 422 and the first through hole 421 of the valve core 42 through the head end 4111 of the flow channel 411 of the valve body 41. The groove 423 is used to reduce the impact pressure when the liquid phase flows, so as to prevent the high-pressure area in the water control pipe 3 from suppressing the liquid production in the low-pressure area.

[0039] like Figure 2 , Figure 5 , Figure 8 and Fig. 9 As shown, it also includes: a motor 51, which is installed inside the side wall of the water control pipe 3, and the output shaft of the motor 51 rotates and penetrates the water control pipe 3, and the output shaft of the motor 51 extends to the inside of the water control pipe 3; a baffle 52, which is connected to the output shaft of the motor 51, and the baffle 52 is suitable for clamping the second end of the valve core 42; when the external liquid phase pressure of the water control pipe 3 is too high, the liquid phase flowing outside the water control pipe 3 will squeeze the first end of the valve core 42 close to the water control pipe 3, if the oil-water detector 44 detects that the liquid phase is water at this time, the servo motor 51 is controlled to drive the baffle 52 to rotate and clamp to the second end of the valve core 42, as shown in FIG. Figure 5 As shown, at this time, the first end of the valve core 42 cannot be reset and moved, so active control of water flow is achieved on the basis of pressure control, completely preventing water from being sucked in, even if the subsequent liquid phase pressure decreases.

[0040] like Figure 2 , Figure 5 , Figure 8 and Fig. 9As shown, it also includes: a slant plate 53 connected to the output shaft of the motor 51, and the slant plate 53 is suitable for squeezing the second end of the valve core 42; when the external liquid phase pressure of the water control pipe 3 is too high, the liquid phase flowing outside the water control pipe 3 will squeeze the first end of the valve core 42 close to the water control pipe 3, and if the oil-water detector 44 detects that the liquid phase is oil at this time, the servo motor 51 can be controlled to drive the slant plate 53 to rotate and squeeze the second end of the valve core 42, as shown in FIG. Figure 8 As shown, the first end of the valve core 42 gradually moves away from the water control pipe 3, and the first through hole 421 of the valve core 42 gradually connects to the flow channel 411 of the valve body 41. During this process, oil can be sucked in at a relatively small pressure to control the production of the horizontal well, and the oil-water detector 44 will continue to detect the liquid phase.

[0041] like Fig.10 As shown, it also includes: a sealing guide ring 61, which is installed on the valve body 41; a rod-shaped structure that slides through the sealing guide ring 61 is connected between the first end and the second end of the valve core 42, and the sealing guide ring 61 is used to seal and at the same time allows the rod-shaped structure of the valve core 42 to slide; a limiting sleeve 62 surrounding the rod-shaped structure of the valve core 42 is connected to the sealing guide ring 61, and the limiting sleeve 62 is used to limit the sliding distance of the first end of the valve core 42. When the external liquid phase pressure of the water control pipe 3 is too high, the liquid phase flowing outside the water control pipe 3 will squeeze the first end of the valve core 42 close to the water control pipe 3. When the valve core 42 moves to block the flow channel 411 of the valve body 41, the limiting sleeve 62 will press against the first end of the valve core 42 to avoid excessive squeezing of the spring 43.

[0042] like Figure 2 As shown, the water control pipe 3 has an upper connecting end 31 and a lower connecting end 32, the upper connecting end 31 of the water control pipe 3 is close to the head end of the oil pipe 1, and the lower connecting end 32 of the water control pipe 3 is close to the tail end of the oil pipe 1; the motor 51 is located between the upper connecting end 31 of the water control pipe 3 and the water control valve 4, so as to reduce the obstruction of the liquid phase by the baffle 52 and the inclined plate 53 on the motor 51, and when the liquid phase in the oil pipe 1 flows from the tail end to the head end, the baffle 52 and the inclined plate 53 on the motor 51 are prevented from affecting the driving of the liquid phase on the second end of the valve core 42.

[0043] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. They only express the preferred implementation modes of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention.

[0044] It should be pointed out that, for ordinary technicians in this field, several modifications, increases and decreases in quantity, improvements and substitutions can be made without departing from the concept of the present invention. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

Claims

1. A water control device for treating a high water content horizontal well, comprising: a water control pipe (3) for communicating with an oil pipe (1); a water control valve (4) mounted on a side wall of the water control pipe (3); characterized in that: The water control valve (4) comprises: a valve body (41) mounted on the side wall of the water control pipe (3), a flow channel (411) being penetrated through the valve body (41), a head end (4111) of the flow channel of the valve body (41) leading to the outside of the water control pipe (3), and a tail end (4112) of the flow channel of the valve body (41) leading to the inside of the water control pipe (3); a valve core (42) movably mounted on the valve body (41), the valve core (42) being suitable for blocking the head and tail ends of the flow channel (411) of the valve body (41); a spring (43) being connected between the valve core (42) and the valve body (41); a first through hole (421) being penetrated through the valve core (42), a first through hole (421) of the valve core (42) A through hole (421) is suitable for communicating with the flow channel (411) of the valve body (41); the valve core (42) is also provided with a second through hole (422) communicating with the first through hole (421), the second through hole (422) of the valve core (42) being connected between the first through hole (421) and the head end (4111) of the flow channel of the valve body (41); an oil-water detector (44), the flow channel (411) of the valve body (41) is provided with a receiving hole, the oil-water detector (44) is installed in the receiving hole of the valve body (41); the valve core (42) is suitable for blocking the receiving hole, the second through hole (422) of the valve core (42) is suitable for communicating with the receiving hole of the valve body (41).

2. A water control device for high water content horizontal well management according to claim 1, characterized in that: The first end of the valve core (42) is located in the flow channel (411) of the valve body (41), the first through hole (421) and the second through hole (422) of the valve core (42) are both located at the first end of the valve core (42); and the second end of the valve core (42) is located inside the water control pipe (3).

3. The water control device for treating a high water content horizontal well according to claim 1, characterized in that: A sand-proof screen is installed at the head end (4111) of the flow channel of the valve body (41), and the sand-proof screen is suitable for being removed from the valve body (41).

4. A water control device for treating a high water content horizontal well according to claim 2, characterized in that: It also includes: the second end of the valve core (42) is an arc-shaped abutment sheet, and the second end of the valve core (42) protrudes toward the center of the water control pipe (3).

5. A water control device for treating a high water content horizontal well according to claim 4, characterized in that: The first through hole (421) and the second through hole (422) of the valve core (42) are stacked in the sliding direction of the valve core (42), and the first through hole (421) and the second through hole (422) of the valve core (42) extend in an intersecting direction; the valve core (42) is provided with a groove (423) that connects the intersection of the first through hole (421) and the second through hole (422), and the groove (423) of the valve core (42) is connected to the head end (4111) of the flow channel of the valve body (41).

6. The water control device for treating a high water content horizontal well according to claim 4, characterized in that: It also comprises: a motor (51) mounted inside the side wall of the water control pipe (3), the output shaft of the motor (51) rotatingly passing through the water control pipe (3), and the output shaft of the motor (51) extending to the inside of the water control pipe (3); and a baffle (52) connected to the output shaft of the motor (51), the baffle (52) being suitable for clamping the second end of the valve core (42).

7. A water control device for treating a high water content horizontal well according to claim 6, characterized in that: It also includes a slanted plate (53) connected to the output shaft of the motor (51), the slanted plate (53) being suitable for squeezing the second end of the valve core (42).

8. The water control device for treating a high water content horizontal well according to claim 5, characterized in that: It also includes: a sealing guide ring (61) mounted on the valve body (41); a rod-shaped structure slidably passing through the sealing guide ring (61) connected between the first end and the second end of the valve core (42); and a limiting sleeve (62) surrounding the rod-shaped structure of the valve core (42) connected to the sealing guide ring (61), the limiting sleeve (62) being used to limit the sliding distance of the first end of the valve core (42).

9. The water control device for treating a high water content horizontal well according to claim 1, characterized in that: The water control pipe (3) has an upper connection end (31) and a lower connection end (32); the upper connection end (31) of the water control pipe (3) is close to the head end of the oil pipe (1), and the lower connection end (32) of the water control pipe (3) is close to the tail end of the oil pipe (1); the motor (51) is located between the upper connection end (31) of the water control pipe (3) and the water control valve (4).

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