CN108561116A - The adaptive Liquid liquid Separation device of trestle type downhole flow - Google Patents

Abstract

A trestle type downhole flow self-adaptive liquid-liquid separation device. The main purpose is to provide a liquid-liquid separation device, which can automatically adjust the internal mechanical structure to adapt to the change of the flow rate of incoming liquid, and complete and ensure the efficient separation of two-phase media with different densities in the device. It is characterized in that: the device includes a variable diameter joint, an inlet pipe, a ring centralizer, a trestle type flow stabilization unit, a variable diameter separation pipe, an overflow pipe and a float type voltage stabilizer connected in sequence; the internal opening of the variable diameter separation pipe There is a separation chamber composed of a cylindrical swirl chamber, a large cone chamber, a small cone chamber and a bottom flow chamber; the trestle-type steady flow unit includes a steady flow slider, a steady flow plate, a steady flow connecting rod, a steady flow spring and a flower type positioning ring; the overflow pipe passes through the trestle type stabilizing unit; the trestle type stabilizing unit is located in the swirl chamber of the cylindrical section, forming a radial sealing structure between the stabilizing plate and the inner wall of the separation chamber of the cylindrical section; the floater type voltage stabilizer Includes rubber float, pressure stabilizing spring, and drain base.

Description

Trestle type downhole flow adaptive liquid-liquid separation device

technical field

The invention relates to a liquid-liquid separation device applied in the fields of petroleum, chemical industry, environmental protection and the like.

Background technique

With the continuous development of oil fields, the water content of the produced fluid is gradually increasing, and the cost of crude oil extraction is increasing day by day. At present, my country's main oilfields have entered a period of high water-cut development. Many oilfields have water cuts exceeding 90%, and the comprehensive water cut of Daqing Oilfield has reached 94%. For oil fields with high water cut, the cost of produced water treatment usually accounts for more than 75% of the cost of crude oil production. Due to the energy consumption of raising water from the wellbore to the surface and the increasing cost of water treatment, the production of oil wells reaches the economic limit and is forced to be abandoned. In addition, there are potential environmental pollution problems in the ground treatment of oily sewage. In order to solve many contradictions in the middle and later stages of the oilfield, the Ministry of Science and Technology of China and PetroChina have successively set up the "863" and "Major Special Project" projects to carry out scientific research, realize oil-water separation in the wellbore, and the separated water is directly injected into the relevant formation, and the separated The high oil-containing liquid is produced to the surface, that is, the same well injection and production process. The core of the same well injection-production process is the downhole oil-water separation system. Due to its advantages of convenient operation, high separation efficiency, small equipment size and long service life, cyclone separation is widely used in surface and downhole oil-water separation, oilfield wastewater treatment and other fields. Cyclone separation utilizes the density difference between immiscible media to carry out centrifugal separation. Under the action of centrifugal force, the medium with higher density moves to the side wall, and the medium with lower density moves to the axis, and finally is discharged from different outlets to realize phase separation. . However, the cyclone separation is greatly affected by the change of incoming liquid volume. When the incoming liquid volume is too high, it will cause the crude oil to emulsify, thereby reducing the separation efficiency sharply. Centrifugal force will still reduce the efficiency of cyclone separation. At present, no downhole oil-water separation device that can realize steady flow and separation in the downhole has been found.

Contents of the invention

In order to solve the technical problems mentioned in the background technology, the present invention provides a trestle-type downhole flow self-adaptive liquid-liquid separation device. This kind of trestle-type downhole flow self-adaptive liquid-liquid separation device adopts ingenious mechanical structure design, so that the device can pass through The adjustment of its own structure is adapted to the changing conditions of the liquid volume, ensuring that the mixed liquid flow maintains a stable flow and pressure when it enters the variable-diameter separation tube for centrifugation, so that the mixed liquid is always kept in a state of efficient separation, which makes up for the cyclone separation. Insufficiently affected by the change of the flow rate, the mixed medium enters the separation device with a stable flow rate under the condition of no external pressure increase/decrease, and maintains continuous high-precision separation.

The purpose of the present invention is to: solve the current cyclone separation device with high requirements on operating conditions, single operating conditions and scope of application; solve the limitation that the specific structure of the cyclone separation device can only handle a single operating parameter, and improve the adaptability of the current separation device Capability and processing accuracy; solve the problem of low separation efficiency of downhole oil-water separation devices due to fluctuation effects such as flow, pressure, and flow velocity, and cannot be applied to the limitations of changing conditions of liquid inflow.

The technical solution of the present invention is: the trestle type downhole flow self-adaptive liquid-liquid separation device, including variable diameter joint, inlet pipe, ring type centralizer, trestle type flow stabilization unit, variable diameter separation pipe, overflow pipe and float type Voltage stabilizer; the top of the overflow pipe is the oil phase outlet;

Among them, the upper end of the variable diameter joint is provided with a pipe taper thread for connecting with the downhole oil pipe, the lower end is provided with an inlet sealing thread for connecting with the inlet pipe, and a through hole is opened in the center, and the overflow pipe runs through the through hole; the variable diameter joint There is an assembly hole at the upper end of the adapter, and a positioning hole at the lower end of the reducing joint, and the overflow pipe is positioned through the overflow pipe positioning thread;

The whole inlet pipe is a thin-walled cylindrical structure, and there are a number of uniformly arranged through-holes on the pipe wall. The through-holes constitute the inlet of the mixed liquid. The ring hole centralizer is connected by thread;

The main body of the ring-hole centralizer is a cylinder, and inside the cylinder, along the axial direction, there is a centering hole through the center of the axis, and a number of diversion holes are opened around the centering hole; the centering hole and the diversion The holes are all through holes through the ring-hole centralizer; the upper end of the outer wall of the ring-hole centralizer is provided with positioning threads for connecting with the inlet pipe, and the lower end of the ring-hole centralizer is used to connect with the variable-diameter separation pipe The sealing thread of the separation chamber;

The variable-diameter separation pipe is cylindrical as a whole, and there is a separation chamber inside. The separation chamber is composed of a cylindrical swirl chamber, a large cone chamber, a small cone chamber and an underflow chamber in sequence; the front end of the variable-diameter separation pipe is connected with the annular hole The centralizer is connected through the sealing thread of the separation chamber;

The trestle-type steady flow unit includes a steady flow slider, a steady flow plate, a steady flow connecting rod, a steady flow spring and a fancy positioning ring; There is a circular sliding hole, and the overflow pipe passes through the circular sliding hole to realize the reciprocating movement between the overflow pipe and the flow stabilization slider; the overall structure of the flow stabilization sheet is fan-shaped, and the bottom of the flow stabilization sheet is provided with a positioning The plate is used to connect with the screw type positioning key on the steady flow slider; the top of the steady flow sheet is provided with a snap piece, which is used to connect with the double-hole snap groove pin key on the upper end of the steady flow connecting rod; the steady flow The piece can rotate around the pin between the positioning piece at the bottom and the screw positioning key, and the upper and lower ends of the steady flow connecting rod can rotate around the pin at the end connection;

The top of the steady flow connecting rod has a double-hole card slot, and the bottom of the steady flow sheet has a single-hole positioning pin, which is connected with the fancy positioning ring through the positioning ring; the fancy positioning ring is surrounded by several fancy positioning keys. Composition, there is a groove in the center of the fancy positioning key, which is used to fix the positioning ring;

The overflow pipe passes through the trestle-type steady flow unit, in which, the fancy positioning ring and the overflow pipe are fixed by thread connection; the upper end of the steady flow spring is fixedly connected with the bottom of the steady flow slider, and the lower end of the steady flow spring is connected with the fancy The top of the positioning ring is fixedly connected, and stretches and deforms with the reciprocating movement of the steady flow slider along the overflow pipe;

The trestle-type flow stabilization unit is located in the swirl chamber of the cylindrical section, and the outer edge of the spirally arranged flow stabilization sheets successively touches the inner wall of the cylindrical section swirl chamber, forming a gap between the flow stabilization sheet and the inner wall of the separation chamber of the cylindrical section. Radial sealing structure;

The float type voltage stabilizer includes a rubber float, a voltage stabilizing spring and a liquid discharge base; among them, the rubber float is in the shape of a truncated cone and placed in the pressure stabilizing chamber on the top of the liquid discharge base, and the small conical surface of the rubber float and the voltage stabilizing spring The upper end is fixedly connected; the lower end of the pressure-stabilizing spring is set on the positioning round table at the axis of the liquid discharge base to complete the positioning of the pressure-stabilizing spring; The liquid separation hole and the annular space outlet at the bottom are water phase outlets; the top of the liquid discharge base is provided with threads for threaded connection with the bottom of the variable-diameter separation pipe.

The invention has the following beneficial effects: the invention is mainly applied to the same-well injection-production technology developed under the condition of high water content of the produced fluid in the late stage of oilfield exploitation, and is used to realize efficient separation of oil and water downhole. The device is mainly composed of variable diameter joints, inlet pipes, annular centralizers, trestle type flow stabilization devices, variable diameter separation pipes, float type voltage stabilizers and other parts. Through the organic combination of various mechanical structures, the present invention makes the structural change of the trestle-type flow stabilization device under the condition of unstable incoming liquid flow ensure the stability of the liquid flow entering the variable-diameter separation pipe, so that it can complete efficient separation. During application, the oil-water mixture enters the interior of the device through the inlet pipe, passes through the diversion hole on the annular centralizer, and impacts on the stabilizing sheet of the trestle-type flow stabilizing device. When the incoming liquid is too large, the pressure on the surface of the stabilizing sheet increases. large, so that the steady flow slider compresses the steady flow spring axially downward. At this time, under the cover of the flow stabilizer, the flow area of the incoming liquid is reduced, resulting in a decrease in the flow into the variable diameter separation tube, and will not be caused by excessive flow. Large occurrence of emulsification and low separation efficiency. Similarly, when the amount of incoming liquid is too small, the opening of the stabilizing plate increases, and the flow area increases, so that the flow into the variable-diameter separation tube remains constant, so that it can still maintain good separation performance. The device of the present invention is simple in structure, reliable in technology, does not need additional downhole/uphole adjustment, and is a mechanical self-operated adjustment device. Eliminates the adverse effects on the separation effect caused by the change of the liquid inflow of the separator due to the change of the liquid production rate of the oil well, the increase of the pressure of the reinjection layer, and the change of the working efficiency of the lift pump, so that the oil-water separation can always be kept in the range of stable and efficient processing capacity Inside. At the same time, the trestle type downhole flow adaptive liquid-liquid separation device proposed by the present invention has the characteristics of simple processing technology, continuous operation, flexible and convenient use, small equipment volume, convenient installation, low operating cost, energy saving and consumption reduction, and high separation efficiency. It can be used for the separation of two-phase media under the condition of unstable incoming liquid flow in different forms. The device will definitely give full play to its advantages and be widely used in petrochemical, metallurgy, water treatment and other fields.

Description of drawings:

Fig. 1 is a cross-sectional view of a trestle-type downhole flow adaptive liquid-liquid separation device.

Fig. 2 is the appearance diagram of the trestle type downhole flow adaptive liquid-liquid separation device.

Figure 3 is a diagram showing the structure of the reducing joint.

Figure 4 is the external view of the reducing joint.

Figure 5 Structural diagram of the inlet pipe.

Figure 6 is a schematic diagram of the connection between the inlet pipe and the annular centralizer

Figure 7 is a connection diagram of the inlet pipe and the annular centralizer.

Figure 8 Appearance of ring hole centralizer.

Figure 9 Sectional view of ring hole centralizer.

Fig. 10 Sectional view of variable-diameter shunt pipe.

Figure 11 Schematic diagram of the connection of the variable diameter separation tube.

Figure 12 is a diagram showing the structure of the trestle-type steady flow unit.

Figure 13 Schematic diagram of the structure of the steady flow slider.

Figure 14 Structural diagram of the stabilizer.

Fig. 15 Structural diagram of steady flow connecting rod.

Figure 16 Diagram of the connection mode between the positioning ring and the fancy positioning ring.

Figure 17 Structural diagram of fancy positioning ring.

Figure 18 Diagram of the fixing method of the fancy positioning ring.

Figure 19 is a diagram of the connection mode between the trestle type flow stabilization device and the overflow pipe.

Fig. 20 The assembly mode diagram of trestle type flow stabilization device and overflow pipe.

Fig. 21 Installation position diagram of trestle type steady flow device.

Figure 22 is a schematic diagram of the sealing structure.

Fig. 23 The downward swing diagram of the stabilizer plate.

Figure 24 combined deformation process diagram.

Fig. 25 Detailed diagram of combined deformation process.

Figure 26 Three-dimensional cross-sectional view of the float regulator.

Figure 27 Schematic diagram of the assembly of the float regulator.

Figure 28 Sectional view of the voltage stabilizing base.

Figure 29 Appearance of the voltage stabilizer base.

Figure 30 is the overall assembly diagram of the front-end system.

Figure 31 The connection diagram of the float type voltage stabilizer and the variable diameter separation tube.

Figure 32 Schematic diagram of main structural parameters.

Figure 33 Dimensional drawing of the steady flow connecting rod.

In the figure 1-mixed liquid inlet, 2-oil phase outlet, 3-water phase outlet, 4-reducing joint, 401-assembly hole, 402-entry sealing thread, 403-positioning hole, 5-inlet pipe, 6-ring Hole centralizer, 601-positioning thread, 602-separation chamber sealing thread, 7- trestle type steady flow unit, 8-variable diameter separation pipe, 801-cylindrical swirl chamber, 802-large cone chamber, 803-small cone Chamber, 804-bottom flow chamber, 9-float type current stabilizer, 10-overflow pipe, 11-pipe taper thread, 12-guiding hole, 13-righting hole, 14-separation chamber, 15-stabilizing slider, 16-stabilizing sheet, 17-stable connecting rod, 18-stable spring, 19-fancy positioning ring, 1901-locating ring, 20-screw positioning key, 21-sliding hole, 22-positioning piece, 23- Card position piece, 24-double hole card slot, 25-single hole positioning pin, 26-fancy positioning pin, 27-rubber float, 28-stabilizing spring, 29-drainage base, 2901-stabilizing chamber, 2902-positioning round table. 30-separation hole.

Detailed ways:

The present invention will be further described below in conjunction with accompanying drawing:

This trestle type downhole flow self-adaptive liquid-liquid separation device includes a variable diameter joint 4, an inlet pipe 5, a ring type centralizer 6, a trestle type flow stabilization unit 7, a variable diameter separation pipe 8, an overflow pipe 10 and a float type stabilizer. Compressor 9; the top of the overflow pipe 10 is the oil phase outlet 2.

Among them, the upper end of the variable diameter joint 4 is provided with a pipe taper thread 11 for connecting with the downhole oil pipe, and the lower end is provided with an inlet sealing thread 402 for connecting with the inlet pipe 5, and a through hole is opened in the center, and the overflow pipe 10 runs through this passage. hole; the upper end of the variable diameter joint 4 has an assembly hole 401, and the lower end of the variable diameter joint 4 has a positioning hole 403, and the overflow pipe 10 is positioned by the overflow pipe positioning thread 404.

The whole of the inlet pipe 5 is a thin-walled cylindrical structure, and there are a number of uniformly arranged through holes on the pipe wall. The through holes constitute the mixed liquid inlet 1, and the front end of the inlet pipe 5 is connected with the variable diameter joint 4 by threads. The rear end of 5 is connected with ring hole type centralizer 6 by thread.

The main body of the ring hole type centralizer 6 is a cylinder, inside the cylinder, along the axial direction, there is a centralizing hole 13 through the center of the axis at the center, and a number of diversion holes 12 are opened around the centralizing hole; the centralizing hole 13 and diversion hole 12 are through holes through the annular centralizer; the upper end of the outer wall of the annular centralizer 6 is provided with a positioning thread 601 for connecting with the inlet pipe 5, and the lower end of the annular centralizer 6 There is a separation cavity sealing thread 602 connected with the variable diameter separation pipe 8 .

The variable-diameter separation pipe 8 is cylindrical as a whole, and there is a separation chamber 14 inside, and the separation chamber is composed of a cylindrical swirl chamber 801, a large cone chamber 802, a small cone chamber 803, and an underflow chamber 804; the variable-diameter separation pipe The front end of 8 is connected with the annular centralizer 6 through the sealing thread 602 of the separation chamber.

Trestle type flow stabilization unit 7 includes flow stabilization slider 15, flow stabilization sheet 16, flow stabilization connecting rod 17, flow stabilization spring 18 and fancy positioning ring 19; the outer wall of flow stabilization slider 15 is provided with spiral positioning keys 20. There is a circular slide hole 21 in the center of the steady flow slider 15, and the overflow pipe 10 passes through the circular slide hole 21 to realize the reciprocating movement between the overflow pipe 10 and the steady flow slider 15; The overall structure of 16 is fan-shaped, and the bottom of the stabilizing plate 16 is provided with a positioning piece 22, which is used to connect with the screw type positioning key 20 on the stabilizing slider 15; , used to connect with the double-hole clamping groove 24 pin keys on the upper end of the flow-stabilizing connecting rod 17; The upper and lower ends of the can rotate around the pins at the joints of the ends.

The top of the flow-stabilizing connecting rod 17 has a double-hole locking groove 24, and the bottom end of the flow-stabilizing plate 16 has a single-hole positioning pin 25, which is connected with the fancy positioning ring 19 through the positioning ring 1901; the fancy positioning ring 19 is composed of several The fancy positioning key 26 is formed after being surrounded and connected, and the center of the fancy positioning key 26 has a groove for fixing the positioning ring 1901 .

The overflow pipe 10 passes through the trestle type steady flow unit 7, wherein, the fancy positioning ring 19 is threadedly connected with the overflow pipe 10 to realize fixing; the upper end of the steady flow spring 18 is fixedly connected with the bottom of the steady flow slider 15, and the steady flow The lower end of the spring 18 is fixedly connected with the top of the fancy positioning ring 19, and stretches and deforms with the reciprocating movement of the steady flow slider 15 along the overflow pipe 10.

The trestle-type flow stabilization unit 7 is located in the swirl chamber 801 of the cylindrical section, and the outer edge of the spirally arranged flow stabilization sheets 16 successively touches the inner wall of the cylindrical section swirl chamber 801, forming a joint between the flow stabilization sheet 16 and the cylindrical section. The radial sealing structure between the inner walls of the separation chamber 801.

The float type voltage stabilizer 9 includes a rubber float 27, a voltage stabilizing spring 28 and a liquid discharge base 29; wherein, the rubber float 27 is a truncated cone, placed in the pressure stabilizing chamber 2901 on the top of the liquid discharge base 29, and the rubber float 27 The small cone surface of the small cone is fixedly connected with the upper end of the pressure stabilizing spring 28; the lower end of the stabilizing spring 28 is sleeved on the positioning round platform 2902 at the axis of the liquid discharge base 29 to complete the positioning of the pressure stabilizing spring 28; the liquid discharge base 29 is in the shape of a cylinder as a whole The top is a pressure stabilizing chamber 2901, and the bottom is provided with a number of penetrating liquid separation holes 30, and the annulus outlet at the bottom is the water phase outlet 3; connect.

The cross-sectional view of the device is shown in Figure 1, and Figure 2 is the appearance of the device. The cross-sectional view of the variable diameter joint 4 is shown in Figure 3. The upper end is provided with a pipe taper thread 11 connected to the downhole tubing, and the lower end is provided with an inlet sealing thread 402 connected with the inlet pipe 5. An overflow pipe 10 is opened through the hole at the center. The upper end is the assembly hole 401 with a larger aperture, and the lower end is the positioning hole 403 with a smaller aperture, and the overflow pipe 10 is positioned through the overflow pipe positioning thread 404 . The variable diameter joint 4 is in the shape of a variable diameter cylindrical structure with a central opening, and its appearance is shown in FIG. 4 . The structural form of the inlet pipe 5 is shown in Figure 5. The whole is a thin-walled cylindrical structure, and there are a number of uniformly arranged through holes on the same wall, that is, the mixed liquid inlet 1. The front end and the variable diameter joint 4 are connected by threads. The connection diagram is shown in Figure 6. As shown, the rear end is connected to the annular centralizer 6 through threads, and the connection method is shown in Figure 7. The annular centralizer 6 is a cylindrical structure with several through holes inside, and its appearance is shown in Figure 8. There is a centering hole 13 penetrating through the axis at its center, and a number of diversion holes 12 are arranged around the axis. Its cross-sectional view is shown in Figure 9. It can be seen that the centering hole 13 and the diversion hole 12 from the shaft center are all through holes, and the upper end of the outer wall is provided with a positioning thread 601 connected to the inlet pipe 5. The lower end is opened and separated from the variable diameter. The separation chamber sealing thread 602 to which the tube is connected. The variable-diameter separation pipe 8 is cylindrical as a whole, and the center is a through-hole with variable diameter. The separation chamber 14 is mainly composed of a cylindrical swirl chamber 801 , a large cone chamber 802 , a small cone chamber 803 and an underflow chamber 804 . Its front end is connected with the environment-controlled centralizer 6 through the sealing thread 602 of the separation chamber, and the schematic diagram of the connection is shown in FIG. 11 . The trestle-type flow stabilization unit 7 is mainly composed of a flow stabilization slider 15, a flow stabilization sheet 16, a flow stabilization link 17, a flow stabilization spring 18, and a fancy positioning ring 19. The overall connection diagram is shown in FIG. 12 . Among them, the structural form of the steady flow slider 15 is shown in Figure 13, the overall structure is a circular tube, the outer wall is provided with a spiral positioning key 20 arranged in a spiral, and a circular sliding hole 21 is opened in the center, and the overflow pipe 10 passes through the circular sliding hole 21. Reciprocating motion can be realized between the overflow pipe 10 and the steady flow slider 15. The structure of the flow stabilizing plate 16 is shown in Figure 14, the overall structure is fan-shaped and the bottom is provided with a positioning piece 22, which is used to connect with the screw type positioning key 20 on the stabilizing slide 15. A locking piece 23 is provided below the top, which is used for pin-key connection with the double-hole locking groove 24 on the upper end of the steady flow connecting rod 17 . The structure of the steady flow connecting rod 17 is shown in Figure 15. The top end has a double-hole locking groove 24, and the bottom end has a single-hole positioning pin 25, which is connected to the fancy positioning ring 19 through a positioning ring 1901. The connection method is shown in Figure 16. Show. The structural form of the fancy positioning ring 19 is as shown in Figure 17, which is a structure of a plurality of fancy positioning keys 26 arranged on the outer circumference of a circular tube. There is a groove at the center of the fancy positioning key 26 for fixing the positioning ring 1901, and the fixing method is as shown in FIG. 18 . The chain connection mode between trestle-type flow stabilizing device 7 and overflow pipe 10 is shown in Figure 19, in which the fancy positioning ring 19 is threadedly fixed with overflow pipe 10, and reciprocating motion can be formed between steady flow slider 15 and overflow pipe 10 , the stabilizing plate 16 can rotate around the pin between the positioning plate 22 at the bottom and the helical positioning key 20, and the upper and lower ends of the connecting rod 17 can rotate around the joint pin in the same way. The upper end of the steady flow spring 18 is fixedly connected with the bottom of the steady flow slider 15, and the lower end is fixedly connected with the top of the fancy positioning ring 19, and stretches and deforms along with the reciprocating movement of the steady flow slider 15 along the overflow pipe 10. The assembly method of trestle-type flow stabilizing device 7 and overflow pipe 10 is shown in FIG. 20 , and the spirally arranged flow stabilizing pieces 16 form a closed ring in the radial cross-sectional direction. The installation position of the trestle-type flow stabilization unit 7 is shown in Figure 21. The positioning is completed through the overflow pipe 10 that runs through the axis and the ring-controlled centralizer 6, and is mainly located in the cylindrical swirl chamber 801 in the variable-diameter separation pipe 8. Inside, concentric with the variable diameter separation pipe 10. After installation, a radial sealing structure is formed between the stabilizing plate 16 on the trestle-type flow stabilizing device 7 and the cylindrical section separation chamber 801 at the front end of the reducing separation pipe 8, as shown in Figure 22, as the stabilizing plate 16 swings up and down , the flow-stabilizing plate 16 and the inner wall of the variable-diameter separating pipe 8 present a variable flow area, as shown in Figure 23, when the flow-stabilizing plate 16 swings downward, the flow-flow area increases. The reciprocating movement process of the flow stabilization slider 15 along the overflow pipe 10 and the combined deformation process of the flow stabilization plate 16 are shown in FIG. 24 and FIG. 25 .

The three-dimensional sectional view of the float type voltage stabilizer 9 is shown in FIG. 26 , which is mainly composed of a rubber float 27 , a voltage stabilizing spring 28 and a liquid discharge base 29 . The rubber float 27 is in the shape of a truncated cone, and the small cone surface is fixedly connected with the upper end of the pressure stabilizing spring 28 , and placed in the pressure stabilizing chamber 2901 on the top of the drain base 29 . The lower end of the pressure stabilizing spring 28 is sleeved on the positioning round platform 2902 at the axis of the liquid discharge base 29 to complete the positioning of the stabilizing spring 28, as shown in FIG. 27 . The liquid discharge base 29 has a cylindrical shape as a whole, the top is a pressure stabilizing chamber 2901 , and the bottom is opened with a number of penetrating liquid separation holes 30 . The cross-sectional view is shown in FIG. 28 . The inner upper section is a circular concave surface, as shown in Figure 29. The top of the float-type voltage stabilizer 9 is provided with threads for connecting with the front-end system. The overall assembly diagram of the front-end system is shown in Figure 30, wherein the float-type voltage stabilizer 9 is threadedly connected with the bottom of the variable-diameter separation tube 8 to complete the fixing of the device And seal, as shown in Figure 31.

When in use, the variable diameter joint 4 is used to complete the connection with the downhole process string, and at the same time, it plays the role of righting and fixing the overflow pipe 10 . The pre-separation medium enters the device from the mixed liquid inlet 1, and the separated light phase is discharged from the device through the oil phase outlet 2, and the heavy phase is discharged from the device through the water phase outlet 3. The annular centralizer 6 can not only be used to guide the incoming liquid to flow into the subsequent separation pipe section, but also to centralize and position the overflow pipe 10 to ensure the stability of the whole device. The trestle-type flow stabilization unit 7 is arranged in a helical form and can guide the incoming liquid so that the liquid flow that originally entered the axial direction will rotate when it enters the variable-diameter separation tube 8, so as to provide the centrifugal force required for separation. On the other hand, it is also possible to adjust the flow area of the incoming liquid with the change of the incoming liquid volume through its own structural characteristics, so as to control the steady flow of the incoming liquid. The main function of the variable-diameter separation pipe 8 is to separate the mixed medium that is stabilized and tangentially accelerated by the trestle-type flow stabilization unit. Through the design of the double-cone structure, the light phase is given an axial upward pressure to ensure the smooth entry of the light phase. The overflow pipe 10 is discharged through the outlet of the oil phase to complete the separation. The water phase discharged from the bottom 8 of the variable-diameter separation tube is discharged from the device after being stabilized by the float type voltage stabilizer and separated. The connection between the reducing joint 4 and the inlet pipe 5 is threaded in order not to increase the radial size of the device, so as to ensure the sealing and fastening of the device. The diversion holes 12 arranged in a ring are used to guide the liquid flow entering the inlet pipe 5 from the mixed liquid inlet 1 to flow through the trestle-type flow stabilization device 7 along the diversion holes 12 to complete the flow stabilization. The centering hole 13 is used to center the position of the overflow pipe, so as to prevent the vibration and eccentricity of the overflow pipe from causing adverse effects on the separation caused by liquid flow impact and the like. The multiple stabilizing plates 16 in the trestle-type stabilizing unit have the same size, but the lengths of the stabilizing connecting rods 17 are different, so that the stabilizing plates are arranged in a spiral pattern, so that the liquid flow forms a tangential rotation speed here and enters the separation chamber 14. The separation is thus accomplished under the action of centrifugal force. At the same time, the bottom of the steady flow slider 15 is connected with the steady flow spring 18, and the side wall is connected with the steady flow sheet 16. When the amount of incoming liquid increases, the impact of the liquid flow on the steady flow sheet 16 will cause the steady flow slider 15 to compress the steady flow spring 18 moves downward, and at the same time drives the stabilizing plate 16 to deflect, resulting in the reduction of the flow area between the stabilizing plate 16 and the separation chamber 14, thereby controlling the flow rate of the mixed liquid entering the cone section of the separation chamber to remain stable. Similarly, when the amount of incoming liquid decreases, the flow-stabilizing slider 15 moves upward under the action of the flow-stabilizing spring 18, causing the flow area between the flow-stabilizing plate and the separation chamber to increase, so that the flow of liquid entering the separation chamber Maintain stability and complete efficient separation. The spiral positioning pin 20 in the steady flow slider 15 is used to be hinged with the steady flow piece, the sliding hole 21 is used to make the steady flow slider 15 slide up and down along the overflow pipe, and the positioning piece 22 is used to connect with the steady flow slider 15. The screw-type positioning key is connected, and the card bit is used to connect the steady flow connecting rod 17. After the incoming liquid hits the stabilizing plate 16 from the upper end, the stabilizing plate 16 presses the stabilizing connecting rod 17 to move downward under the action of pressure, and then pushes the fancy positioning ring 19 to move axially downward. The size of the flow stabilization spring 18 controls the fancy positioning ring 19 to reciprocate up and down, causing the flow area of the annular space formed by the flow stabilization plate 16 to gradually change. The float type voltage stabilizer 9 is mainly used to stabilize the pressure at the bottom outlet of the variable-diameter separation tube to ensure efficient separation, that is, to ensure that the split ratio of the variable-diameter separation tube 8 is at an optimal level by stabilizing the bottom pressure. Stable value, when the flow at the underflow outlet increases, the rubber float 27 moves axially downward under the action of pressure, resulting in a decrease in the radial flow area of the liquid flow, and when the flow at the underflow outlet decreases, the pressure-stabilizing spring 28 pushes the rubber The float 27 is axially upward, which increases the flow area and ensures the stability of the outlet pressure at the bottom of the overall device. There is a liquid separation hole 30 on the liquid discharge base 29, which is used to introduce the separated heavy liquid phase into the water phase outlet, and the discharge device completes the separation.

Fig. 32 is a diagram showing the dimensions of the main structure of the trestle type downhole flow self-adaptive liquid-liquid separation device. Satisfy the following relationship:

In the formula: n-the number of openings on the inlet pipe

Fig. 33 is the size constraint relationship of the connecting rod in the steady flow connecting rod dimension diagram:

The blades are helically distributed, and the difference between the lengths of adjacent connecting rods is L1- L2= L2- L3=.....= L9- L10=h=λ/n.

In the formula: h—the difference between the lengths of adjacent connecting rods;

λ—helix pitch;

n—the number of leaves;

The device has been applied experimentally in the oil field. The obtained results prove that: 1. The present invention has a simple treatment process and can realize stable continuous separation under variable liquid volume conditions; 2. Through the design of the flow stabilization device before separation, the internal flow rate of the device can be realized without external power control flow rate Self-adaptive, ensuring that the liquid intake is always within the suitable separation range, and ensuring separation accuracy; 3. The equipment is small in size, easy to install, and low in operating costs; 4. Through the design of the voltage stabilizing device at the back end of the separation, the device can adjust itself during the separation process The split ratio is always in the best state to ensure efficient separation; 5. Through the spiral design of the trestle-type flow stabilization unit, the shearing and breaking of the liquid droplets by the flow field is reduced, and the tangential velocity of the fluid medium is guaranteed at the same time. The tangential force required for the pressure guarantee separation.

Claims (1)

1. a kind of adaptive Liquid liquid Separation device of trestle type downhole flow, including reducer union, inlet tube, ring type centralizer, stack Bridge-type steady flow unit, reducing separating pipe, overflow pipe and float-type voltage-stablizer；The top of overflow pipe exports for oil phase；

Wherein, the upper end of reducer union is provided with the pipe taper thread for being connected with down-hole oil tube, and lower end, which is provided with, to be used for and inlet tube The inlet seal screw thread of connection, through-hole is provided at center, and overflow pipe runs through this through-hole；The upper end of reducer union is provided with pilot hole, The lower end of reducer union is provided with location hole, and overflow pipe is completed to position by overflow pipe positioning threads；

The generally thin-wall tubular structure of inlet tube, several evenly arranged through-holes are provided on tube wall, and several through-holes are constituted Entry to mixed solution, front end and the reducer union of inlet tube are connected through a screw thread, and rear end and the annular ring type centralizer of inlet tube pass through It is threadedly coupled；

The main body of annular ring type centralizer is that cylinder in an axial direction, is provided with helping through axle center in the inside of the cylinder at center Positive hole is provided with several deflector holes around the righting hole；Righting hole is through the logical of the annular ring type centralizer with deflector hole Hole；The outer wall upper end of annular ring type centralizer is equipped with the positioning threads for being connected with inlet tube, and the lower end of annular ring type centralizer is opened It is useful with and the disengagement chamber that connect of reducing separating pipe seal screw thread；

Reducing separating pipe is integrally cylindrical, and inside is provided with disengagement chamber, and the disengagement chamber is by cylindrical section vortex chamber, auger chamber, small Cone chamber and underflow chamber are sequentially connected composition；The front end of reducing separating pipe seals screw thread by disengagement chamber with annular ring type centralizer and connects It connects；

Trestle type steady flow unit includes current stabilization sliding block, current stabilization piece, current stabilization connecting rod, current stabilization spring and fancy locating ring；Current stabilization is slided The outer wall of block is equipped with the spiral positioning key of helical arrangement, and the center of current stabilization sliding block is provided with round slide opening, and overflow pipe passes through concentric stroking Hole can be moved back and forth with realizing between overflow pipe and current stabilization sliding block；The overall structure of current stabilization piece is in fan-shaped, the bottom of current stabilization piece Portion is equipped with locating plate, is used for connecting with the spiral positioning key pin key on current stabilization sliding block；Lower section is equipped with screens piece at the top of current stabilization piece, For being connect with the diplopore screens slot pin key of current stabilization small end；Current stabilization piece can be between the locating plate and spiral positioning key of bottom Pin rotate, the upper/lower terminal of current stabilization connecting rod can be around the pin rotation of its end junction；

The top of current stabilization connecting rod is provided with diplopore screens slot, and the bottom end of current stabilization piece is provided with single hole positioning pin, passes through locating ring and fancy Locating ring connects；Fancy locating ring is made of several fancy positioning keys after connection, and fancy positioning key is provided with groove at center, For stationary positioned circle；

Overflow pipe passes through trestle type steady flow unit, wherein fancy locating ring is connected through a screw thread with overflow pipe to realize fixation；Surely The upper end of stray bullet spring is fixedly connected with current stabilization slider bottom, is fixedly connected at the top of the lower end of current stabilization spring and fancy locating ring, with Along the reciprocating motion of overflow pipe dilatation occurs for current stabilization sliding block；

Trestle type steady flow unit is located in cylindrical section vortex chamber, helically the outer rim of the current stabilization piece of the linear alignment successively with cylindrical section The inner wall of vortex chamber touches, form current stabilization piece detach cavity wall with cylindrical section between radial seal structure；

Float-type voltage-stablizer includes rubber float, pressure-stabilizing spring and drain pedestal；Wherein, rubber float is pyramidal, is placed in In pressure stabilizing cavity at the top of drain pedestal, the small conical surface of rubber float is fixedly connected with pressure-stabilizing spring upper end；End cap under pressure-stabilizing spring On the positioning round table at drain pedestal axle center, the positioning of pressure-stabilizing spring is completed；Drain pedestal is integrally cylindrical, and top is steady Chamber, bottom is pressed to be provided with several perforative liquid separation holes, bottom part ring Air Export exports for water phase；It is used equipped with screw thread at the top of drain pedestal To connect with reducing separating pipe bottom thread.