Water control and oil stabilization tool for low-viscosity light crude oil

Abstract

The application discloses a low-viscosity light crude oil water control and oil stabilization tool, and relates to the technical field of oil and gas field development in the petroleum industry. The tool comprises a tool main body, a tool inlet, a water flow channel outlet and an oil flow channel outlet are arranged on the tool main body, the tool main body comprises a pressure drop loss channel, an oil flow channel, a water flow channel, a pressure lead channel and a low-pressure chamber, the pressure drop loss channel is communicated with the tool inlet, the pressure drop loss channel and the oil flow channel and the water flow channel form a junction, the pressure lead channel is communicated with the pressure drop loss channel, the other end is connected with a pressure-sensitive component, the pressure-sensitive component is connected with a flow channel switching component capable of extending into the junction; the low-pressure chamber is communicated with the second end of the pressure drop loss channel, the pressure-sensitive component drives the flow channel switching component to change the posture, so that the pressure drop loss channel selectively communicates with the oil flow channel or the water flow channel. The water control and oil stabilization tool can independently distinguish crude oil and water according to the different additional pressure drop losses of the crude oil and the water, so that the balanced production profile of the low-viscosity crude oil is realized, and the water content of the old oil production well is reduced.

Description

Technical Field

[0001] This invention relates to the field of oil and gas field development technology in the petroleum industry, and more specifically, to a tool for controlling water and stabilizing oil in low-viscosity light crude oil. Background Technology

[0002] Due to the contradictions between and within oil reservoir layers, uneven production profiles are prone to occur during oil well development, leading to a rapid increase in water cut and premature water flooding, which greatly affects economic benefits and restricts the effectiveness of oilfield development.

[0003] To address these issues, professionals in the petroleum industry have designed automatic water control devices, based on the viscosity difference between crude oil and produced water, to address the issue of mechanical oil stabilization and water control. These devices are suitable for situations where the viscosity difference between crude oil and formation water is relatively small. However, when the viscosity difference between crude oil and formation water is small, the pressure drops of oil and water within the control device are quite similar, resulting in minimal oil stabilization and water control effectiveness. For example, in a certain oilfield, the viscosity of condensate oil under underground conditions is only 0.3 cp, while the viscosity of formation water under the same conditions is 0.7 cp, a difference of only 0.4 cp. Conventional automatic water control devices are not very effective in controlling water in such cases. Currently popular adaptive flow control tools also have relatively poor adaptability to low-viscosity crude oil.

[0004] In view of the above, this application is hereby submitted. Summary of the Invention

[0005] The purpose of this invention is to provide a water control and oil stabilization tool for low-viscosity light crude oil. This tool can automatically distinguish between crude oil and water based on the different additional pressure drop losses of crude oil and water, so as to achieve a balanced production profile of low-viscosity crude oil and reduce the water cut of old oil wells.

[0006] The embodiments of the present invention are implemented as follows:

[0007] A water control and oil stabilization tool for low-viscosity light crude oil includes a tool body with an internal separation chamber. The tool body has a tool inlet, a water outlet, and an oil outlet. The separation chamber includes a pressure drop loss channel, an oil channel, a water channel, a pressure tapping channel, and a low-pressure chamber. The first end of the pressure drop loss channel is connected to the tool inlet, and the second end of the pressure drop loss channel forms a junction with the oil channel and the water channel. The oil channel is connected to the oil outlet, and the water channel is connected to the water outlet. One end of the pressure tapping channel is connected to the first end of the pressure drop loss channel, and the other end is connected to a pressure-sensitive component. The actuator end of the pressure-sensitive component is connected to a flow channel switching component that can extend into the junction.

[0008] The low-pressure chamber is connected to the second end of the pressure drop loss channel. The pressure-sensitive component is located in the low-pressure chamber so that the trigger end and the execution end of the pressure-sensitive component can form a pressure difference, thereby driving the flow channel switching component to change its posture, so that the second end of the pressure drop loss channel can selectively connect to the oil flow channel or the water flow channel.

[0009] In an optional embodiment, the pressure drop loss channel includes a variable diameter channel group consisting of at least one variable diameter channel connected in series. The inlet end of the variable diameter channel group forms the first end of the pressure drop loss channel, and the outlet end of the variable diameter channel group forms the second end of the pressure drop loss channel. The portion from the inlet end to the outlet end of the variable diameter channel group forms a channel with a gradually changing diameter.

[0010] In an alternative implementation, the inlet diameter of the variable diameter flow channel assembly is larger than the outlet diameter.

[0011] In an optional embodiment, in the variable diameter flow channel group, each variable diameter flow channel has a variable diameter flow channel inlet and a variable diameter flow channel outlet. The variable diameter flow channel inlet at the first section forms the inlet of the variable diameter flow channel group, and the variable diameter flow channel outlet at the last section forms the outlet of the variable diameter flow channel group. The diameter of the variable diameter flow channel inlet is larger than the diameter of the variable diameter flow channel outlet, and the maximum diameter of the portion between the variable diameter flow channel inlet and the variable diameter flow channel outlet is larger than the diameter of the variable diameter flow channel inlet.

[0012] In an optional implementation, in adjacent variable diameter channels, the outlet of the previous variable diameter channel serves as the inlet of the next variable diameter channel.

[0013] In an optional implementation, in adjacent variable diameter channels, the maximum diameter of the portion between the inlet and outlet of the previous variable diameter channel is greater than the maximum diameter of the portion between the inlet and outlet of the next variable diameter channel.

[0014] In an optional implementation, the diameter of the first end of the pressure drop loss channel is larger than the diameter of the oil flow channel outlet, and the diameter of the oil flow channel outlet is greater than or equal to the diameter of the water flow channel outlet.

[0015] In an optional embodiment, the pressure-sensitive component includes a balance plate, a spring, a connecting rod, and a switch. The spring is fixed between the balance plate and the inner wall of the low-pressure chamber. The end of the balance plate away from the spring forms a telescopic sealing connection with the end of the pressure-feeding channel. The connecting rod is hinged between the balance plate and the switch, and the middle part of the connecting rod forms a sealing connection with the inner wall of the junction penetration point. The switch can selectively block the oil flow channel or the water flow channel under the action of the connecting rod.

[0016] In an alternative embodiment, the balance plate and the end of the pressure channel are connected by an elastic seal.

[0017] In an optional embodiment, a water vortex chamber is provided between the water channel and the water channel outlet, the water channel outlet flow direction is tangent to the water vortex chamber inlet, and the water channel outlet is located at the vortex center of the water vortex chamber.

[0018] The beneficial effects of the embodiments of the present invention are:

[0019] The low-viscosity light crude oil water control and oil stabilization tool provided in this invention uses a pressure drop loss channel and a pressure-sensitive component to separate the oil and water. Based on the difference in fluid density, it generates different additional resistances for crude oil and water. Furthermore, it autonomously distinguishes between crude oil and water based on the additional pressure drop losses, allowing crude oil and water to enter the oil flow channel and water flow channel respectively. This reduces water production, achieves a balanced production profile, lowers the water cut of old oil wells, extends the waterless oil production period of newly drilled oil wells, and ultimately increases crude oil production.

[0020] In general, the water control and oil stabilization tool for low-viscosity light crude oil provided in this embodiment of the invention is suitable for water control and oil stabilization in low-viscosity light crude oil production wells. It can reduce the water cut of old wells, extend the production life of old wells, balance the production profile of new wells, and significantly extend the waterless production period, thereby ultimately improving the crude oil recovery rate. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A horizontal cross-sectional view of the water control and oil stabilization tool for low-viscosity light crude oil provided in an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the water flow in the water control and oil stabilization tool for low-viscosity light crude oil provided in an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of the oil flow in the low-viscosity light crude oil water control and oil stabilization tool provided in an embodiment of the present invention.

[0025] Icons: 1. Tool body; 101. Tool inlet; 102. Pressure drop loss channel; 2. Pressure tapping channel; 201. High-pressure port of pressure tapping channel; 202. Elastic seal; 203. Balance plate; 204. Spring; 205. Connecting rod; 206. Sealing membrane; 207. Switch; 208. Low-pressure chamber; 3. First variable diameter flow channel; 301. Inlet of first variable diameter flow channel; 4. Second variable diameter flow channel; 401. Inlet of second variable diameter flow channel; 5. Oil flow channel; 501. Inlet of oil flow channel; 502. Low-pressure chamber port; 503. Transition zone of oil flow channel; 504. Outlet of oil flow channel; 6. Water flow channel; 601. Inlet of water flow channel; 602. Tangential opening of water flow channel; 603. Water vortex chamber; 604. Outlet of water flow channel. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Terms like "approximately" and "basically" are used to indicate that the content does not require absolute precision, but rather allows for a certain degree of deviation. For example, "approximately equal to" does not simply mean absolute equality; because absolute equality is difficult to achieve in actual production and operation, a certain degree of deviation is generally present. Therefore, in addition to absolute equality, "approximately equal to" also includes the aforementioned situation of some deviation. Using this as an example, in other cases, unless otherwise specified, terms like "approximately" and "basically" have similar meanings.

[0031] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] Example

[0033] Given that current adaptive flow control and water management tools have relatively poor adaptability to low-viscosity crude oil, our research found that due to the low compressibility of water, the density of water under formation conditions does not change much compared to surface conditions, remaining at approximately 1050 kg / m³. 3 Crude oil with lower viscosity typically has a smaller mass, only 750 kg / m³. 3 Even smaller, thus the density difference between water and oil can reach 300 kg / m³. 3 Crude oil with lower viscosity generally has a lower density. The difference in oil-water density can be used to initially identify the fluid, and the difference in oil-water viscosity can be used to further identify the fluid, ultimately achieving the goal of water control and oil stabilization. Therefore, to solve the long-standing problems of uneven production profiles and rapid water cut increases in low-viscosity light oil wells, this embodiment designs an oil stabilization and water control tool for low-viscosity light crude oil based on the differences in oil-water density and viscosity. The aim is to reduce water production, stabilize oil production, and ultimately reduce water cut and improve crude oil recovery.

[0034] Please refer to details. Figure 1 This embodiment provides a low-viscosity light crude oil water control and oil stabilization tool, which includes a tool body 1 with a separation chamber inside. The tool body 1 is provided with a tool inlet 101, a water outlet 604, and an oil outlet 504. The tool inlet 101, the water outlet 604, and the oil outlet 504 are all connected to the separation chamber. The tool inlet 101 serves as the inlet port of the mixed oil, and the water outlet 604 and the oil outlet 504 serve as the outlet ports of water and oil, respectively. The mixed oil undergoes oil-water separation in the separation chamber.

[0035] Specifically, the separation chamber includes a pressure drop loss channel 102, an oil flow channel 5, a water flow channel 6, a pressure tapping channel 2, and a low-pressure chamber 208. This means that the separation chamber is divided into spaces of at least the pressure drop loss channel 102, the oil flow channel 5, the water flow channel 6, the pressure tapping channel 2, and the low-pressure chamber 208. The relative relationships of these spaces are as follows: the first end (oil inlet end) of the pressure drop loss channel 102 is connected to the tool inlet 101, and the second end (oil outlet end) of the pressure drop loss channel 102 forms a confluence with the oil flow channel 5 and the water flow channel 6. This means that the pressure drop loss channel 102, the oil flow channel 5, and the water flow channel 6 form a three-flow confluence, providing a structural basis for oil separation and flow.

[0036] The oil flow channel 5 is connected to the oil flow channel outlet 504 for discharging oil; the water flow channel 6 is connected to the water flow channel outlet 604 for discharging water. One end of the pressure-sensing channel 2 (pressure-sensing channel high-pressure port 201) is connected to the first end of the pressure drop loss channel 102, and the other end (pressure-sensing channel low-pressure port) is connected to a pressure-sensitive component, enabling a pressure difference to be formed between the two ends of the pressure-sensing channel 2. The actuator of the pressure-sensitive component is connected to a flow channel switching component that can extend into the junction, so that the pressure-sensitive component can drive the actuator to move under the action of the pressure difference, thereby triggering the flow channel switching component at the junction to change its posture, achieving the purpose of physical separation of oil and water. Specifically, the low-pressure chamber 208 is connected to the second end of the pressure drop loss channel 102 (through the low-pressure chamber port 502). The pressure-sensitive component is located inside the low-pressure chamber 208 to ensure that the pressure difference between the two ends of the pressure-sensing channel 2 can act on the pressure-sensitive component, so that the trigger end and the execution end of the pressure-sensitive component can form a pressure difference, thereby driving the flow channel switching component to change its posture, so that the second end of the pressure drop loss channel 102 can selectively connect to the oil flow channel 5 or the water flow channel 6, and complete the physical separation of oil and water.

[0037] Through the above technical solution, due to the low density and low inertia of light crude oil, the additional pressure drop is very small when it flows through the pressure drop loss channel 102; while water, due to its high density and strong inertia, has a large additional pressure drop when it flows through the pressure drop loss channel 102. The pressure drop of water is much greater than that of light crude oil. This creates an automatic identification function for light crude oil and water within the pressure drop loss channel 102, enabling oil stabilization and water control. In other words, it achieves the goal of generating different additional resistances for crude oil and water based on the difference in fluid density, and further distinguishing between crude oil and water based on their additional pressure drop losses.

[0038] As can be seen from the above, the pressure drop loss channel 102 is mainly used to provide resistance to oil and water, and to achieve autonomous separation due to the difference in pressure drop loss. In order to significantly increase the additional resistance to water and add a small resistance to crude oil, thereby reducing the amount of water produced, in some embodiments, the pressure drop loss channel 102 includes a variable diameter channel group consisting of at least one variable diameter channel connected in series. That is, the variable diameter channel group can be composed of multiple variable diameter channels connected in series. In general, the inlet end of the variable diameter channel group forms the first end of the pressure drop loss channel 102, and the outlet end of the variable diameter channel group forms the second end of the pressure drop loss channel 102. The part from the inlet end to the outlet end of the variable diameter channel group forms a channel with a gradually changing diameter, that is, the diameter of the channel is gradually changing, for example, changing in the form of an inclined line or a wavy line, the purpose of which is to create flow resistance for the flowing oil.

[0039] Taking a channel with wavy lines as an example, it can provide intermittent flow resistance to the flowing oil. In this embodiment, for example, the variable diameter flow channel group includes two variable diameter flow channels: a first variable diameter flow channel 3 and a second variable diameter flow channel 4. The inlet 301 of the first variable diameter flow channel 3 forms the first end of the pressure drop loss channel 102, and the outlet of the second variable diameter flow channel 4 forms the second end of the pressure drop loss channel 102. Based on this scheme, the diameter of the inlet end of the variable diameter flow channel group is larger than the diameter of its outlet end, that is, the diameter of the inlet 301 of the first variable diameter flow channel is larger than the diameter of the outlet of the second variable diameter flow channel. The diameter here essentially refers to the size of the flow area, which can create a throttling effect when the mixed oil flows.

[0040] Based on the above scheme, in the variable diameter flow channel group, each variable diameter flow channel has a variable diameter flow channel inlet and a variable diameter flow channel outlet. The variable diameter flow channel inlet at the first section forms the inlet of the variable diameter flow channel group, and the variable diameter flow channel outlet at the last section forms the outlet of the variable diameter flow channel group. The diameter of the variable diameter flow channel inlet (here, the diameter refers to the aforementioned flow area, the same below) is larger than the diameter of the variable diameter flow channel outlet, and the maximum diameter of the portion between the variable diameter flow channel inlet and the variable diameter flow channel outlet is larger than the diameter of the variable diameter flow channel inlet.

[0041] Taking the first variable diameter channel 3 and the second variable diameter channel 4 as examples, the inlet 301 of the first variable diameter channel has a larger flow area than the outlet of the first variable diameter channel, and the maximum flow area of ​​the intermediate gradual transition section from the inlet 301 to the outlet of the first variable diameter channel is greater than the flow area of ​​the inlet 301 of the first variable diameter channel. Similarly, the inlet 401 of the second variable diameter channel has a larger flow area than the outlet of the second variable diameter channel, and the maximum flow area of ​​the intermediate gradual transition section from the inlet 401 to the outlet of the second variable diameter channel is greater than the flow area of ​​the inlet 401 of the second variable diameter channel, thus forming a channel with a wavy change. It should be noted that the intermediate gradual transition section, for example, is in the form where the cross-sectional area (along the flow direction) of the first variable diameter channel 3 and the second variable diameter channel 4 first increases and then decreases, resulting in a more significant effect on adhesion resistance.

[0042] Furthermore, in adjacent variable-diameter channels, the outlet of the upper variable-diameter channel serves as the inlet of the lower variable-diameter channel, meaning adjacent variable-diameter channels are directly connected. For example, the inlet 401 of the second variable-diameter channel is the outlet of the first variable-diameter channel. In this case, the flow area of ​​the inlet 301 of the first variable-diameter channel is larger than that of the inlet 401 of the second variable-diameter channel, creating a step-by-step narrowing and throttling effect. Based on this, the maximum diameter of the portion between the inlet and outlet of the upper variable-diameter channel is larger than the maximum diameter of the portion between the inlet and outlet of the lower variable-diameter channel. For example, the maximum diameter of the middle channel of the first variable-diameter channel 3 is larger than that of the middle channel of the second variable-diameter channel 4, making the step-by-step narrowing and throttling effect more significant. It is understood that the oil inlet 501 serves as the outlet of the second variable-diameter channel, and the flow area of ​​the inlet 401 of the second variable-diameter channel is larger than that of the oil inlet 501.

[0043] In order to create a throttling effect as a whole through the pressure drop loss channel 102, the oil flow channel 5 and the water flow channel 6, the diameter of the first end of the pressure drop loss channel 102 is larger than the diameter of the oil flow channel outlet 504, and the diameter of the oil flow channel outlet 504 is larger than or equal to the diameter of the water flow channel outlet 604, thereby creating a throttling effect from the inlet to the outlet.

[0044] In some embodiments, the pressure-sensitive component includes a balance plate 203, a spring 204, a connecting rod 205, and a switch 207. The spring 204 is fixed between the balance plate 203 and the inner wall of the low-pressure chamber 208, and is used to realize the reciprocating movement of the balance plate 203 after being compressed (when the resultant force on the upper and lower surfaces of the balance plate 203 is not equal to zero, it will move up and down until the force is balanced). The end of the balance plate 203 away from the spring 204 forms a telescopic sealing connection with the end of the pressure channel 2 (the low-pressure port of the pressure channel), so that the balance plate 203 has a tendency to move closer or further away from the end of the pressure channel 2. During this movement, it is sufficient to ensure the sealing of the pressure channel 2 (to ensure reliable pressure difference formation). Specifically, in one embodiment, the balance plate 203 and the end of the pressure channel 2 form a sealing connection through an elastic seal 202 (e.g., an elastic bellows).

[0045] The connecting rod 205 is hinged between the balance plate 203 and the switch 207, and the middle part of the connecting rod 205 forms a seal with the inner wall of the junction (through the sealing membrane 206, the center of the sealing membrane 205 is penetrated by the connecting rod 205, and the seal between the sealing membrane 205 and the connecting rod 205 is tight and moves with the connecting rod 205). The switch 207 can selectively block the oil channel 5 or the water channel 6 under the action of the connecting rod 205, so as to realize that the corresponding medium is discharged from the matching oil channel outlet 504 or water channel outlet 604.

[0046] Specifically, an oil flow transition zone 503 is formed between the oil flow channel 5 and the oil flow channel outlet 504 to achieve buffering and energy release of the oil flow. Furthermore, a water vortex chamber 603 is provided between the water flow channel 6 (e.g., arc-shaped) and the water flow channel outlet 604. The outlet flow direction of the water flow channel 6 is tangential to the inlet of the water vortex chamber 603, forming a water flow channel tangential opening 602 at their junction. This allows the water flowing in from the water flow channel inlet 601 to enter the annular water vortex chamber 603 tangentially, creating a vortex and effectively buffering and releasing the energy of the water with greater inertia. The water flow channel outlet 604 is located at the vortex center of the water vortex chamber 603, which is a downward-sloping surface towards the water flow channel outlet 604 to facilitate smooth outflow of the water after sufficient buffering.

[0047] Please see Figure 2Water enters the pressure drop loss channel 102 from the tool inlet 101, and then flows through the first variable diameter channel 3 and the second variable diameter channel 4. During the flow, due to the high density of water, the additional pressure loss is large. Therefore, the pressure on the upper surface of the balance plate 203 is greater than the pressure on the lower surface, causing the balance plate 203 to move downward, which drives the switch 207 to swing, opening the water channel inlet 601. Water enters the water channel 6 from the water channel inlet 601 and swirls significantly in the water vortex chamber 603, generating a large additional pressure loss. Finally, it flows out from the water channel outlet 604. The entire process generates two additional pressure losses for the water: the first when the water flows through the first variable diameter channel 3 and the second variable diameter channel 4, and the second when the water flows through the vortex chamber 603. The superposition of the two additional pressure losses causes a large additional pressure drop in the water within the stabilized oil tool.

[0048] Please see Figure 3 Low-viscosity light crude oil enters the pressure drop loss channel 102 from the tool inlet 101, then flows through the first variable-diameter channel 3 and the second variable-diameter channel 4 to reach the oil flow channel 5. Due to the low density of the oil, the additional pressure loss during the flow process is also small. The pressure difference between the upper and lower surfaces of the balance plate 203 is not significant. Under the elastic force of the spring 204, the balance plate 203 moves upward, driving the switch 207 to move, closing the water flow channel inlet 601. Finally, the low-viscosity light crude oil flows directly to the oil flow channel outlet 504 through the oil flow channel transition zone 503 and flows out of the oil stabilizing tool. Therefore, the additional pressure drop generated by this oil stabilizing tool on the low-viscosity light crude oil is very small.

[0049] It should be noted that in the formation produced fluids, water and low-viscosity light crude oil are mixed together to form an emulsion, which cannot be separated under formation temperature and pressure conditions. In this case, the density of the mixture is generally related to the percentage of water and oil in the mixture; the higher the water content, the greater the density of the mixture, and the greater the pressure loss when the mixture passes through the first variable-diameter channel 3 and the second variable-diameter channel 4. This makes it easier for the mixture to enter the water channel 6 and flow out from the water channel outlet 604. Therefore, the more water in the mixture, the greater the density of the mixture, and the greater the additional pressure drop. Thus, using the oil stabilization tool provided in this embodiment is at least beneficial for water control and oil stabilization of low-viscosity light crude oil, thereby improving oilfield development returns.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention. It should be noted that the structures or components illustrated in the accompanying drawings are not necessarily drawn to scale, and descriptions of well-known components, processing techniques, and processes have been omitted to avoid unnecessarily limiting the invention.

Claims

1. A tool for controlling water and stabilizing oil in low-viscosity light crude oil, characterized in that, The tool body includes a separation chamber formed inside. The tool body has a tool inlet, a water flow channel outlet, and an oil flow channel outlet. The separation chamber includes a pressure drop loss channel, an oil flow channel, a water flow channel, a pressure tapping channel, and a low-pressure chamber. The first end of the pressure drop loss channel is connected to the tool inlet, and the second end of the pressure drop loss channel forms a junction with the oil flow channel and the water flow channel. The oil flow channel is connected to the oil flow channel outlet, and the water flow channel is connected to the water flow channel outlet. One end of the pressure tapping channel is connected to the first end of the pressure drop loss channel, and the other end is connected to a pressure-sensitive component. The actuator end of the pressure-sensitive component is connected to a flow channel switching component that can extend into the junction. The low-pressure chamber is connected to the second end of the pressure drop loss channel, and the pressure-sensitive component is located in the low-pressure chamber so that the trigger end and the execution end of the pressure-sensitive component can form a pressure difference, thereby driving the flow channel switching component to change its posture, so that the second end of the pressure drop loss channel can selectively connect to the oil flow channel or the water flow channel. The pressure drop loss channel includes a variable diameter channel group consisting of at least one variable diameter channel connected in series. The inlet end of the variable diameter channel group forms the first end of the pressure drop loss channel, and the outlet end of the variable diameter channel group forms the second end of the pressure drop loss channel. The portion from the inlet end to the outlet end of the variable diameter channel group forms a channel with a gradually changing diameter. The pressure-sensitive component includes a balance plate, a spring, a connecting rod, and a switch. The spring is fixed between the balance plate and the inner wall of the low-pressure chamber. The end of the balance plate away from the spring forms a telescopic sealing connection with the end of the pressure-feeding channel. The connecting rod is hinged between the balance plate and the switch, and the middle part of the connecting rod forms a sealing connection with the inner wall of the junction penetration point. The switch can selectively block the oil flow channel or the water flow channel under the action of the connecting rod. The balance plate and the end of the pressure channel are connected by an elastic seal; A water vortex chamber is provided between the water channel and the water channel outlet. The water channel outlet direction is tangent to the water vortex chamber inlet, and the water channel outlet is located at the vortex center of the water vortex chamber.

2. The low-viscosity light crude oil water control and oil stabilization tool according to claim 1, characterized in that, The diameter of the inlet end of the variable diameter flow channel group is larger than the diameter of its outlet end.

3. The low-viscosity light crude oil water control and oil stabilization tool according to claim 2, characterized in that, In the variable diameter flow channel group, each variable diameter flow channel has a variable diameter flow channel inlet and a variable diameter flow channel outlet. The variable diameter flow channel inlet at the first section forms the inlet of the variable diameter flow channel group, and the variable diameter flow channel outlet at the last section forms the outlet of the variable diameter flow channel group. The diameter of the variable diameter flow channel inlet is larger than the diameter of the variable diameter flow channel outlet, and the maximum diameter of the portion between the variable diameter flow channel inlet and the variable diameter flow channel outlet is larger than the diameter of the variable diameter flow channel inlet.

4. The low-viscosity light crude oil water control and oil stabilization tool according to claim 3, characterized in that, In adjacent variable diameter flow channels, the outlet of the previous variable diameter flow channel serves as the inlet of the next variable diameter flow channel.

5. The low-viscosity light crude oil water control and oil stabilization tool according to claim 4, characterized in that, In adjacent variable diameter channels, the maximum diameter of the portion between the inlet and outlet of the previous variable diameter channel is greater than the maximum diameter of the portion between the inlet and outlet of the next variable diameter channel.

6. The water control and oil stabilization tool for low-viscosity light crude oil according to any one of claims 1-5, characterized in that, The diameter of the first end of the pressure drop loss channel is larger than the diameter of the oil flow channel outlet, and the diameter of the oil flow channel outlet is greater than or equal to the diameter of the water flow channel outlet.

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