Composite sand control oil-gas separator capable of automatically adjusting oil-gas liquid level

Abstract

This invention relates to the field of oilfield development technology, and more particularly to a composite sand-control oil-gas separator with automatic adjustment of oil and gas levels. It includes: a shell; an inlet pipe fixed to the lower part of the shell, with a sand-control shell at the inlet end and a gas monitoring module inside the inlet pipe; a connecting shell fixed to the shell, with a fixed shell fixedly connected and communicating with its upper side, and a movable shell slidably and sealingly connected to the outer side of the fixed shell; and a connecting rod fixed to the connecting shell, with a helical blade fixedly connected to it, the helical blade being fixedly connected to the fixed shell. This invention adjusts the position of the oil on the movable shell by changing the position of the movable shell when the oil-gas ratio changes, thereby optimizing the oil-gas separation efficiency, improving the gas-liquid separation effect and stability, and enhancing the overall adaptability of the device to fluctuations in downhole fluid composition.

Description

Technical Field

[0001] This invention relates to the field of oilfield development technology, and in particular to a composite sand-control oil-gas separator that automatically adjusts the oil and gas level. Background Technology

[0002] Centrifugal gas-liquid separators are key equipment that utilize centrifugal force to achieve efficient separation of gas and liquid phases. They are widely used in petrochemical, natural gas processing, compressed air systems, refrigeration, and energy power industries. Their basic principle is to force the oil-gas mixture to rotate along a specific flow channel (such as a spiral channel or guide vanes), causing oil droplets to be thrown against the separator wall under centrifugal force, thus achieving gas-liquid separation.

[0003] Existing centrifugal gas-liquid separators typically have a fixed spiral channel length. However, in actual industrial applications, production conditions are complex and variable. Centrifugal separators with fixed channel lengths exhibit the following inherent drawbacks: When the proportion of gas entering the separator increases significantly (i.e., the liquid content of the gas-liquid mixture decreases), the oil content in the mixture relatively decreases, and droplets are more easily separated to the separator wall under centrifugal force. At this point, the fixed, often long, total channel path becomes redundant. This extra path not only leads to unnecessary pressure loss and increased energy consumption, but more seriously, the oil already separated to the channel wall can be re-entered by the high-speed gas flow. The re-shearing, entrainment, and entrainment process creates finer, more difficult-to-separate mist-like droplets, which actually reduces the separation efficiency and increases the liquid carryover rate in the outlet gas. Secondly, when the gas proportion decreases and the oil proportion increases, more centrifugal separation time and a longer path are required to ensure that the less dense gas can fully escape from the liquid and completely throw the droplets away from the core gas flow area. At this time, the fixed length of the flow channel will cause some oil (especially the small-particle mist-like oil) to be discharged from the gas outlet with the gas flow before reaching the wall collection area, resulting in excessive "mist-like oil" content in the gas and also reducing the liquid recovery rate. Summary of the Invention

[0004] In order to overcome the shortcomings mentioned in the background art, the present invention provides a composite sand-proof oil-gas separator that automatically adjusts the oil-gas level.

[0005] The technical solution of this invention is: a composite sand-proof oil-gas separator with automatic oil-gas level adjustment, comprising:

[0006] The outer casing has an exhaust pipe and a drain pipe respectively provided on its upper and lower sides;

[0007] The liquid inlet pipe is fixed to the lower part of the outer shell. The input end of the liquid inlet pipe is provided with a sandproof shell, and a gas monitoring module for detecting the gas-liquid ratio is provided inside the liquid inlet pipe.

[0008] A connecting shell is fixedly connected to the outer shell. The connecting shell is provided with a flow channel for oil flow. The inlet pipe passes through the outer shell and communicates with the connecting shell. A fixed shell is fixedly connected and communicates with the upper side of the connecting shell. A movable shell is slidably connected to the outer side of the fixed shell.

[0009] A connecting rod is fixedly connected to the connecting shell. A helical blade is fixedly connected to the connecting rod. The helical blade is fixedly connected to the fixed shell. The movable shell is slidably connected to the helical blade.

[0010] A first hydraulic push rod is fixedly connected to the connecting shell, and the telescopic end of the first hydraulic push rod is fixedly connected to the movable shell.

[0011] As a preferred embodiment of the present invention, the diameter of the upper projection circle of the spiral blade on the horizontal plane is A, the diameter of the lower projection circle on the horizontal plane is B, and the inner diameter of the movable shell is C, where A=C>B.

[0012] As a preferred embodiment of the present invention, it further includes:

[0013] A guide shell is slidably connected to the inside of the outer shell, and the guide shell is located above the movable shell;

[0014] The second hydraulic push rod is fixedly connected to the telescopic end of the first hydraulic push rod, and the telescopic end of the second hydraulic push rod is fixedly connected to the guide shell.

[0015] As a preferred embodiment of the present invention, the guide shell is composed of a circular tube and a tapered part. The tapered part is provided with circumferentially uniformly distributed through holes, and the axis of the circular tube coincides with the axis of the fixed shell, and the inner diameter of the circular tube is D, where D=A.

[0016] As a preferred embodiment of the present invention, it further includes:

[0017] The first conical shell has several equidistantly distributed cones, all of which are fixed to the inside of the outer shell by connecting blocks. The first conical shell is provided with several first flow holes.

[0018] The number of second conical shells is the same as that of the first conical shells. Both are fixed to the inside of the outer shell by connecting blocks. The diameters of the circles in which the first and second conical shells are projected on the horizontal plane are the same, and this diameter is smaller than the inner diameter of the outer shell. The second conical shell fits into the corresponding first conical shell. The second conical shell is provided with a number of second flow holes that are the same as the number of first flow holes on the first conical shell. The second flow holes communicate with the corresponding first flow holes. The second conical shell is located above the guide shell.

[0019] As a preferred embodiment of the present invention, both the first flow hole and the second flow hole are composed of a vertical portion and an inclined portion, and the inclined portions on the first flow hole and the adjacent second flow hole are respectively located on the side that is close to each other. The central axis of the vertical portion on the first flow hole does not coincide with the central axis of the corresponding vertical portion on the second flow hole.

[0020] As a preferred embodiment of the present invention, the tips of the first conical shell and the second conical shell both face upward, and the inclined portions of the first flow hole and the second flow hole both slope upward from the side away from the axis of the outer shell to the side close to the axis of the outer shell.

[0021] As a preferred embodiment of the present invention, it further includes:

[0022] The third conical shell has several of them, all of which are fixed to the inside of the outer shell by connecting blocks, and the third conical shell is provided with several third flow holes;

[0023] The fourth conical shell, the same number as the third conical shell, is fixed to the inside of the outer shell by a connecting block. The fourth conical shell fits into the corresponding third conical shell. The fourth conical shell is provided with a fourth flow hole, the same number as the third flow hole on the third conical shell. The fourth flow hole communicates with the corresponding third flow hole. The diameters of the circles in which the third and fourth conical shells are projected onto the horizontal plane are equal, and this diameter is smaller than the diameter of the circle in which the first conical shell is projected onto the horizontal plane.

[0024] As a preferred embodiment of the present invention, the fourth conical shell is fixedly connected to a guide shell, the outer diameter of the guide shell being equal to the diameter of the circle in which the fourth conical shell is projected onto the horizontal plane, a sealing member is fixedly connected inside the outer shell, the sealing member is fixedly connected to a connecting ring, the outer shell is rotatably connected to a number of drive rings consistent with the number of the third conical shells, the drive rings are limited and slidably connected to the corresponding connecting rings, and a drive module for driving the drive rings to rotate is provided on the outer shell.

[0025] As a preferred embodiment of the present invention, the sealing member is made of an elastic deformable material, and the side of the sealing member near the connecting shell and the side of the guide shell near the connecting shell are at the same height, for sealing the gap between the guide shell and the outer shell.

[0026] Compared with the prior art, the technical effects achieved by the present invention are as follows: when the oil-gas ratio changes, the present invention changes the position of the moving shell to change the length of the spiral flow channel, thereby adjusting the position of the oil on the liquid surface of the moving shell, optimizing the oil-gas separation efficiency, improving the gas-liquid separation effect and stability, and also enhancing the overall adaptability of the device to fluctuations in downhole fluid composition.

[0027] By changing the shape of the sealing component, when the gas content decreases, the outer peripheral flow channel between the outer shell and the guide shell is opened, allowing the gas to flow through quickly and reducing flow resistance and pressure drop, thus improving emission efficiency. When the gas content increases, the sealing component is twisted to gradually close the outer peripheral flow channel, forcing the gas to flow through the flow holes of the third and fourth conical shells, extending the contact path and increasing the adsorption surface area, so as to deeply capture and remove residual oil droplets in the gas, thereby enhancing the purification effect. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0029] Figure 2 This is a three-dimensional structural cross-sectional view of the outer casing of the present invention;

[0030] Figure 3 This is a three-dimensional structural cross-sectional view of the fixed shell and the movable shell of the present invention;

[0031] Figure 4 This is a three-dimensional structural diagram of the helical blade and the first hydraulic push rod of the present invention;

[0032] Figure 5 This is a three-dimensional structural diagram of the first and second conical shells of the present invention;

[0033] Figure 6 This is a three-dimensional structural cross-sectional view of the third and fourth conical shells of the present invention;

[0034] Figure 7 This is a three-dimensional structural cross-sectional view of the first and second conical shells of the present invention;

[0035] Figure 8 This is a three-dimensional structural diagram of the third and fourth flow holes of the present invention.

[0036] The components in the diagram are labeled as follows: 1-outer shell, 2-inlet pipe, 3-connecting shell, 4-fixed shell, 5-moving shell, 6-connecting rod, 7-spiral blade, 8-first hydraulic push rod, 9-guide shell, 10-second hydraulic push rod, 11-first conical shell, 12-second conical shell, 13-first flow hole, 14-second flow hole, 15-third conical shell, 151-third flow hole, 16-fourth conical shell, 161-fourth flow hole, 17-guide shell, 18-sealing component, 19-connecting ring, 20-drive ring. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this does not limit the scope of protection and application of the present invention. Example 1

[0038] Considering that the spiral flow channel of existing centrifugal separators for gas-liquid separation is usually of a fixed length, when the proportion of gas in the raw material changes during the process of processing gas-liquid mixtures, the length cannot be changed synchronously, which leads to the simultaneous impact on the effect and efficiency of gas-liquid separation. Therefore, this application provides a composite sand-proof oil-gas separator that automatically adjusts the oil-gas liquid level.

[0039] like Figures 1-4 As shown, the oil-gas separator includes: a housing 1, with an exhaust pipe and a drain pipe respectively installed on the upper and lower sides of the housing 1; an inlet pipe 2, fixedly connected to the lower part of the housing 1, with a sand-proof shell installed at the input end of the inlet pipe 2, and a gas monitoring module for detecting the gas-liquid ratio installed inside the inlet pipe 2; a connecting shell 3, fixedly connected to the housing 1, with a flow channel for oil flow on the connecting shell 3, the inlet pipe 2 passing through the housing 1 and communicating with the connecting shell 3, a fixed shell 4 fixedly connected and communicating with the upper side of the connecting shell 3, and a movable shell 5 slidably connected to the outer side of the fixed shell 4; a connecting rod 6, fixedly connected to the connecting shell 3, with a spiral blade 7 fixedly connected to the connecting rod 6, the spiral blade 7 fixedly connected to the fixed shell 4, and the movable shell 5 slidably connected to the spiral blade 7; and a first hydraulic push rod 8, fixedly connected to the connecting shell 3, with the telescopic end of the first hydraulic push rod 8 fixedly connected to the movable shell 5.

[0040] In the above scheme, a wire mesh demister (an existing device, not shown in the figure) is installed in the exhaust pipe on the outer shell 1 to further remove petroleum carried in the gas; the sand shield on the inlet pipe 2 is located at its left end to intercept solid impurities in the oil-gas mixture; the gas monitoring module on the inlet pipe 2 is also an existing device, not shown in the figure, used to detect the ratio of gas to petroleum in the oil-gas mixture; the connecting shell 3 is located above the drain pipe on the outer shell 1, and the left side of the connecting shell 3 is connected to the inlet pipe 2; the fixed shell 4 and the movable shell 5 are both provided with a power supply on the inner side of the outer shell 1. The annular gap for oil flow, the movable shell 5 in the figure is in the state of moving upward to the limit position; the central axes of the fixed shell 4 and the movable shell 5 are both coincident with the central axis of the connecting rod 6, the fixed shell 4, the movable shell 5 and the spiral blade 7 together form a spiral channel, the fixed shell 4 and the movable shell 5 together form an overflow weir; the fixed part of the first hydraulic push rod 8 is connected to a pipe passing through the outer shell 1, and the extension length of the first hydraulic push rod 8 is controlled by the operator using an external control device (both the pipe and the external control device are existing devices, and neither is shown in the figure).

[0041] like Figure 4 As shown, the diameter of the upper part of the spiral blade 7 projected onto the horizontal plane is A, the diameter of the lower part of the spiral blade 7 projected onto the horizontal plane is B, and the inner diameter of the moving shell 5 is C, where A = C > B.

[0042] In the above scheme, the shape of the helical blade 7 is defined to improve the sealing between the helical blade 7 and the movable housing 5.

[0043] The specific workflow of the above scheme is as follows:

[0044] When this device is needed to process the oil and gas mixture extracted from the oil well, the operator connects the inlet pipe 2 to the wellhead channel, allowing the oil and gas mixture to flow along the inlet pipe 2 (during this process, the sand shield at the left end of the inlet pipe 2 intercepts solid impurities in the oil and gas mixture, while the gas monitoring module inside the inlet pipe 2 monitors the proportion of the oil and gas mixture). Subsequently, the oil and gas mixture enters the connecting shell 3 and flows upward along the aforementioned spiral channel.

[0045] As the oil-gas mixture flows upward along the spiral channel, it is separated by centrifugal force. During this process, the centrifugal force on the gas is less than that on the oil. Therefore, the oil moves towards the inside of the fixed shell 4 and the movable shell 5, while the gas moves towards the connecting rod 6. At the same time, the separated gas is discharged from the exhaust pipe on the upper side of the outer shell 1. During the discharge process, the wire mesh demister in the exhaust pipe of the outer shell 1 further treats the residual oil in the gas (causing the oil to condense into large oil droplets and fall downward into the outer shell 1), further ensuring the quality of gas-liquid separation.

[0046] When the liquid level in the spiral channel is higher than the upper side of the movable shell 5, the oil overflows into the annular gap between the movable shell 5 and the outer shell 1, and flows downward in sequence along the gap between the movable shell 5 and the outer shell 1 → the annular gap between the fixed shell 4 and the outer shell 1 → the channel connecting the shell 3, and is finally discharged outward through the drain pipe at the lower end of the outer shell 1.

[0047] During the flow of the oil-gas mixture along the inlet pipe 2, when the gas monitoring module in the inlet pipe 2 detects an increase in gas content (i.e., a decrease in oil content), the operator activates the first hydraulic push rod 8. The telescopic end of the first hydraulic push rod 8 drives the moving shell 5 to move downward (the moving shell 5 moves downward along the fixed shell 4), thereby shortening the length of the spiral flow channel and reducing the total stroke of the oil-gas mixture in the separator. This allows the separated gas and oil to leave the spiral flow channel more quickly, reducing the risk of the separated oil being entrained by the subsequent airflow. When an increase in gas content is detected, the operator controls the first hydraulic push rod 8 to drive the moving shell 5 to move upward, thereby extending the length of the spiral flow channel and providing sufficient centrifugal separation time and stroke for the oil. This ensures that the oil has enough time to complete its movement towards the wall under centrifugal force, guaranteeing the gas-liquid separation effect.

[0048] After the designated period of use, the staff will disconnect the inlet pipe 2 and clean and maintain the internal parts of the device in preparation for future use. Example 2

[0049] Based on Example 1, this example further optimizes a composite sand-proof oil-gas separator that automatically adjusts the oil-gas level.

[0050] like Figure 4 As shown, it also includes: a guide shell 9, which is slidably connected to the inside of the outer shell 1, and the guide shell 9 is located above the movable shell 5; a second hydraulic push rod 10, which is fixed to the telescopic end of the first hydraulic push rod 8, and the telescopic end of the second hydraulic push rod 10 is fixed to the guide shell 9. The guide shell 9 is composed of a circular tube part and a tapered part. Its tapered part is provided with circumferentially evenly distributed through holes. The axis of its circular tube part coincides with the axis of the fixed shell 4 and the inner diameter of the circular tube part is D, where D=A.

[0051] In the above scheme, the circular tube portion of the guide shell 9 is located at its upper part to guide the separated gas. By changing the position of the guide shell 9, the distance between the guide shell 9 and the movable shell 5 can be changed, thereby changing the area of ​​the oil outlet. The fixed part of the second hydraulic push rod 10 is connected to a pipe passing through the outer shell 1, and the extension length of the telescopic end of the second hydraulic push rod 10 is controlled by an external control device used by the operator (both the pipe and the external control device are existing devices, and neither is shown in the figure). When the separated oil flows into the outer shell 1, the oil flows between the guide shell 9 and the movable shell 5. During the downward movement of the movable shell 5, the extension end of the first hydraulic push rod 8 passes through the second hydraulic push rod 10. The transmission of the second hydraulic push rod 10 drives the guide shell 9 to move downward synchronously, thereby ensuring the stability of the distance between the guide shell 9 and the moving shell 5. When the guide shell 9 moves downward until its upper circular tube is flush with the spiral blade 7, the spiral blade 7 enters the circular tube of the guide shell 9 as the guide shell 9 continues to move downward. When the oil content increases, the operator activates the second hydraulic push rod 10, and the telescopic end of the second hydraulic push rod 10 drives the guide shell 9 to move upward relative to the moving shell 5, thereby increasing the distance between the moving shell 5 and the guide shell 9, that is, increasing the oil flow area, ensuring that the oil can flow out smoothly after passing through the spiral flow channel, reducing oil pressure fluctuations, and mitigating the impact on downstream equipment. Example 3

[0052] Based on Example 2, this example further optimizes a composite sand-proof oil-gas separator that automatically adjusts the oil-gas level, aiming to improve the purity of the separated gas.

[0053] like Figure 2 , Figure 5 and Figure 7As shown, it also includes: a first conical shell 11, having several equidistantly distributed shells, all fixed to the inside of the outer shell 1 by connecting blocks, and having several first flow holes 13 on the first conical shell 11; a second conical shell 12, having the same number as the first conical shell 11, both fixed to the inside of the outer shell 1 by connecting blocks, the first conical shell 11 and the second conical shell 12 having the same diameter as the circle projected onto the horizontal plane, and this diameter being smaller than the inner diameter of the outer shell 1, the second conical shell 12 fitting against the corresponding first conical shell 11, the second conical shell 12 having the same number of second flow holes 14 as the first conical shell 11, the second flow holes 14 communicating with the corresponding first flow holes 13, and the second conical shell 12 being located above the guide shell 9.

[0054] In the above scheme, the specific number of the first conical shell 11 and the second conical shell 12 are selected by the staff. The figure shows two as an example. The number of the first flow hole 13 and the second flow hole 14 are also selected by the staff. The second conical shell 12 is located on the lower side of the corresponding first conical shell 11.

[0055] like Figure 7 As shown, both the first flow hole 13 and the second flow hole 14 are composed of a vertical part and an inclined part. The inclined parts on the first flow hole 13 and the adjacent second flow hole 14 are located on the side that is close to each other. The central axis of the vertical part on the first flow hole 13 does not coincide with the central axis of the vertical part on the corresponding second flow hole 14. The tips of the first conical shell 11 and the second conical shell 12 are both pointing upward. The inclined parts of the first flow hole 13 and the second flow hole 14 are both inclined upward from the side away from the axis of the outer shell 1 to the side close to the axis of the outer shell 1.

[0056] In the above scheme, the shapes of the first flow hole 13 and the second flow hole 14 are defined so that after the first flow hole 13 and the corresponding second flow hole 14 are connected, the whole presents an N shape, so as to increase the contact area between the gas and the first conical shell 11 and the second conical shell 12.

[0057] The specific workflow of the above scheme is as follows:

[0058] As the separated gas moves upward, it is gathered by the lower second conical shell 12, causing it to flow upward through the lower second flow hole 14 and the lower first flow hole 13 in sequence. This makes the overall gas movement path N-shaped, increasing the probability of contact between the gas and the lower first conical shell 11 and the lower second conical shell 12.

[0059] During the gas movement, the tiny oil droplets carried in the gas will collide with the surfaces of the lower first conical shell 11 and the lower second conical shell 12, causing the oil droplets to adhere to the lower first conical shell 11 and the lower second conical shell 12, and then fall back into the outer shell 1, thereby further enhancing the oil-gas separation effect. The oil droplets adhering to the upper first conical shell 11 and the upper second conical shell 12 will be intercepted by the lower first conical shell 11 during the falling process, thus falling onto the lower first conical shell 11, and being guided by the lower first conical shell 11 to flow downward along the gap between it and the outer shell 1. Example 4

[0060] Based on Example 3, this example further optimizes a composite sand-proof oil-gas separator that automatically adjusts the oil-gas level.

[0061] like Figure 5 , Figure 6 and Figure 8 As shown, it also includes: a third conical shell 15, having several of them, all fixed to the inside of the outer shell 1 by connecting blocks, and having several third flow holes 151 on the third conical shell 15; a fourth conical shell 16, having the same number as the third conical shell 15, all fixed to the inside of the outer shell 1 by connecting blocks, the fourth conical shell 16 fitting against the corresponding third conical shell 15, the fourth conical shell 16 having the same number of fourth flow holes 161 as the third conical shell 15, the fourth flow holes 161 communicating with the corresponding third flow holes 151, the diameters of the circles in which the third conical shell 15 and the fourth conical shell 16 are projected onto the horizontal plane are equal, and this diameter is smaller than the diameter of the circle in which the first conical shell 11 is projected onto the horizontal plane.

[0062] In the above scheme, the specific number of the third conical shell 15 and the fourth conical shell 16 can be selected by the staff. The figure shows two of them distributed vertically. The third conical shell 15 and the fourth conical shell 16 at the bottom are both located above the first conical shell 11 at the top. The tips of the third conical shell 15 and the fourth conical shell 16 are both pointing downwards. The specific number of the third flow hole 151 and the fourth flow hole 161 can also be selected by the staff. Both are composed of a vertical part and an inclined part. The inclined parts on both are located on the side that is close to each other. The inclination direction of the inclined parts on both is upward from the side close to the axis of the outer shell 1 to the side away from the axis of the outer shell 1.

[0063] like Figure 6 and Figure 8As shown, the fourth conical shell 16 is fixedly connected to a guide shell 17. The outer diameter of the guide shell 17 is equal to the diameter of the circle in which the fourth conical shell 16 is projected on the horizontal plane. A sealing member 18 is fixedly connected inside the outer shell 1. A connecting ring 19 is fixedly connected to the sealing member 18. The outer shell 1 is rotatably connected to a number of drive rings 20 that are the same as the number of the third conical shell 15. The drive rings 20 are limited and slidably connected to the corresponding connecting rings 19. A drive module for driving the drive rings 20 to rotate is provided on the outer shell 1.

[0064] In the above scheme, the guide shell 17 is located on the upper side of the fourth conical shell 16; the sealing member 18 is used to seal the gap between the guide shell 17 and the outer shell 1; the connecting ring 19 is located on the upper side of the sealing member 18; in this embodiment, the outer shell 1 is composed of three sections, upper, middle and lower, and adjacent sections are fixed by connecting brackets, the drive ring 20 is located in the gap between adjacent ends, and the drive ring 20 can only slide up and down along the connecting ring 19; the drive module is an existing device, and the figure shows a motor and gear set as an example, wherein the gears in the gear set are located on the output shaft of the motor and the drive ring 20 respectively.

[0065] like Figure 8 As shown, the sealing element 18 is made of an elastic deformable material. The side of the sealing element 18 near the connecting shell 3 and the side of the guide shell 17 near the connecting shell 3 are at the same height, and are used to seal the gap between the guide shell 17 and the outer shell 1.

[0066] In the above scheme, the material of the sealing component 18 is limited so that the sealing component 18 can automatically reset after deformation.

[0067] The specific workflow of the above scheme is as follows:

[0068] As the gas passes through the upper first conical shell 11 and continues to move upward, the volume of gas separated within the same time decreases as the gas content decreases. During this process, the gas moves upward sequentially through the two first conical shells 11 and the two second conical shells 12 according to the above process. When the gas moves upward and contacts the lower third conical shell 15, part of the gas is guided by the lower third conical shell 15 to move away from the central axis of the outer shell 1, while another part of the gas moves upward through the lower third flow hole 151 and the lower fourth flow hole 161. The gas moving away from the central axis of the outer shell 1 moves upward along the gap between the outer shell 1 and the guide shell 17 (when the gas moves upward to the position of contacting the upper third conical shell 15, the movement path of the gas is the same as described above), thereby reducing the resistance to the upward movement of the gas and allowing the separated gas to move quickly outside the outer shell 1.

[0069] As the gas content decreases, the proportion of petroleum carried in the separated gas increases simultaneously. At this time, the staff adjusts the shape of the two sealing elements 18 according to the specific gas-liquid ratio. The movement process of the lower sealing element 18 is described as an example:

[0070] The lower drive module is activated, causing the drive ring 20 to rotate. The drive ring 20 drives the connecting ring 19 to rotate synchronously, and the connecting ring 19 drives the upper part of the sealing member 18 to rotate synchronously during the rotation (the lower part of the sealing member 18 remains stationary during this process). This causes the sealing member 18 to twist, and at the same time, the middle part of the sealing member 18 gathers towards the central axis of the outer shell 1 during the twisting process, thereby gradually sealing and blocking the gap between the outer shell 1 and the guide shell 17. This allows the gas to flow upwards only through the lower third flow hole 151 and the lower fourth flow hole 161 in sequence. Then, the third conical shell 15 and the fourth conical shell 16 adsorb the oil droplets contained in the gas, further reducing the oil content in the gas. When the gas content decreases, the operator controls the drive module to reset the lower sealing member 18 to its initial state for subsequent use.

[0071] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A composite sand-proof oil-gas separator with automatic oil-gas level adjustment, characterized in that, include: The outer shell (1) is provided with an exhaust pipe and a drain pipe on its upper and lower sides respectively; The liquid inlet pipe (2) is fixed to the lower part of the outer shell (1). The input end of the liquid inlet pipe (2) is provided with a sandproof shell, and a gas monitoring module for detecting the gas-liquid ratio is provided inside the liquid inlet pipe (2). A connecting shell (3) is fixed inside the outer shell (1). The connecting shell (3) is provided with a flow channel for oil flow. The inlet pipe (2) passes through the outer shell (1) and communicates with the connecting shell (3). A fixed shell (4) is fixedly connected and communicates with the upper side of the connecting shell (3). A movable shell (5) is slidably connected to the outer side of the fixed shell (4). A connecting rod (6) is fixed to the connecting shell (3). A spiral blade (7) is fixed to the connecting rod (6). The spiral blade (7) is fixed to the fixed shell (4). The movable shell (5) is slidably connected to the spiral blade (7). The diameter of the upper part of the spiral blade (7) projected onto the horizontal plane is A, and the diameter of the lower part of the spiral blade (7) projected onto the horizontal plane is B. The inner diameter of the movable shell (5) is C, and A=C>B. The first hydraulic push rod (8) is fixedly connected to the connecting shell (3), and the telescopic end of the first hydraulic push rod (8) is fixedly connected to the movable shell (5); Also includes: The guide shell (9) is slidably connected to the inside of the outer shell (1), and the guide shell (9) is located above the movable shell (5); The second hydraulic push rod (10) is fixedly connected to the telescopic end of the first hydraulic push rod (8), and the telescopic end of the second hydraulic push rod (10) is fixedly connected to the guide shell (9); The guide shell (9) is composed of a circular tube and a tapered part. The tapered part is provided with circumferentially distributed through holes. The axis of the circular tube coincides with the axis of the fixed shell (4) and the inner diameter of the circular tube is D, where D=A.

2. The composite sand-proof oil-gas separator with automatic oil-gas level adjustment according to claim 1, characterized in that, Also includes: The first conical shell (11) has several equidistantly distributed shells, all of which are fixed to the interior of the outer shell (1) by connecting blocks. The first conical shell (11) is provided with several first flow holes (13). The number of second conical shells (12) is the same as that of the first conical shells (11), and they are all fixed to the inside of the outer shell (1) by connecting blocks. The diameter of the circle in which the first conical shell (11) and the second conical shell (12) are projected on the horizontal plane is the same, and the diameter is smaller than the inner diameter of the outer shell (1). The second conical shell (12) fits into the corresponding first conical shell (11). The second conical shell (12) is provided with a number of second flow holes (14) that are the same as the number of first flow holes (13) on the first conical shell (11). The second flow holes (14) communicate with the corresponding first flow holes (13). The second conical shell (12) is located above the guide shell (9).

3. The composite sand-proof oil-gas separator with automatic oil-gas level adjustment according to claim 2, characterized in that, Both the first flow hole (13) and the second flow hole (14) are composed of a vertical part and an inclined part. The inclined parts on the first flow hole (13) and the adjacent second flow hole (14) are located on the side that is close to each other. The central axis of the vertical part on the first flow hole (13) does not coincide with the central axis of the vertical part on the corresponding second flow hole (14).

4. The composite sand-proof oil-gas separator with automatic oil-gas level adjustment according to claim 3, characterized in that, The tips of the first conical shell (11) and the second conical shell (12) are both facing upwards, and the inclined portions of the first flow hole (13) and the second flow hole (14) are both inclined upwards from the side away from the axis of the outer shell (1) to the side close to the axis of the outer shell (1).

5. A composite sand-proof oil-gas separator with automatic oil-gas level adjustment according to claim 4, characterized in that, Also includes: The third conical shell (15) has several of them, all of which are fixed to the inside of the outer shell (1) by connecting blocks. The third conical shell (15) is provided with several third flow holes (151). The fourth conical shell (16) has the same number as the third conical shell (15) and is fixed to the inside of the outer shell (1) by a connecting block. The fourth conical shell (16) fits into the corresponding third conical shell (15). The fourth conical shell (16) is provided with a fourth flow hole (161) with the same number as the third flow hole (151) on the third conical shell (15). The fourth flow hole (161) communicates with the corresponding third flow hole (151). The diameters of the circles in which the third conical shell (15) and the fourth conical shell (16) are projected onto the horizontal plane are equal, and this diameter is smaller than the diameter of the circle in which the first conical shell (11) is projected onto the horizontal plane.

6. The composite sand-proof oil-gas separator with automatic oil-gas level adjustment according to claim 5, characterized in that, The fourth conical shell (16) is fixedly connected to a guide shell (17). The outer diameter of the guide shell (17) is equal to the diameter of the circle in which the fourth conical shell (16) is projected on the horizontal plane. A sealing member (18) is fixedly connected inside the outer shell (1). A connecting ring (19) is fixedly connected to the sealing member (18). The outer shell (1) is rotatably connected to a number of driving rings (20) that are the same as the number of the third conical shell (15). The driving rings (20) are limited and slidably connected to the corresponding connecting rings (19). A driving module for driving the driving rings (20) to rotate is provided on the outer shell (1).

7. A composite sand-proof oil-gas separator with automatic oil-gas level adjustment according to claim 6, characterized in that, The sealing element (18) is made of an elastic deformable material. The side of the sealing element (18) near the connecting shell (3) and the side of the guide shell (17) near the connecting shell (3) are at the same height, and are used to seal the gap between the guide shell (17) and the outer shell (1).

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