A reservoir expansion and sealing jet fluid production and sand removal device for oil, water and gas wells

Abstract

This invention discloses an oil-water-gas well reservoir expansion and sealing jet fluid production and sand removal device, relating to the field of oil production technology. The device includes a central tube and further comprises: an expansion assembly located around the central tube, with its lower end positioned on the central tube and its upper end capable of sliding on the central tube, used for radial expansion under the drive of a hydrodynamic fluid; and a jet nozzle located below the central tube and below the expansion assembly, used to spray hydrodynamic fluid, creating a negative pressure zone in the spray area to absorb formation fluid. This integrated design combines the expansion assembly and the jet nozzle, allowing for the completion of both annular sealing and jet fluid production and sand removal functions in a single well run, avoiding the cumbersome process of two well runs required by traditional technologies and shortening the operation time.

Description

Technical Field

[0001] This invention relates to the field of oil production technology, specifically to a reservoir expansion and sealing jet fluid production and sand removal device for oil, water and gas wells. Background Technology

[0002] In oilfield development, continuously improving recovery rates and the economic efficiency of oil and water wells is an inherent requirement. Under different terrain and geological conditions, the use of complex development schemes such as deviated wells, horizontal wells, horizontal branch wells, fishbone-shaped horizontal wells, sidetracked wells, and sidetracked horizontal wells is increasingly common. Large-scale development is underway in reservoirs with poor formation and crude oil properties, including sand-producing reservoirs, heavy oil reservoirs, and high-pour-point reservoirs. Long-term development in older oilfields has also led to an increase in wells with casing deformation and damage. Reservoir management technologies for sand removal, unblocking, and permeability improvement are also improving accordingly. Coalbed methane is part of the national energy strategy. Currently, most coalbed methane well development in coalfields uses deviated wells, L-shaped horizontal wells, horizontal branch wells, and U-shaped wells. During production, sand and coal dust are produced from the wellbore, and blockages occur around the wellbore. Conventional pumping technologies such as rod pumps and electric submersible pumps suffer from wear and tear on the tubing and rods, and frequent sand jamming in wells with high sand production, due to the sliding and rotational movements of downhole equipment. This affects equipment lifespan and shortens pump inspection cycles.

[0003] Using a jet pump can better avoid the above problems. However, although conventional jet pumps have no moving parts, the packing and jetting functions are separated. A packer must first be installed to seal the annulus before the jet pump is installed, making the operation complex (requiring two well runs). The power fluid is either used to drive the packer expansion or to generate negative pressure in the jet, failing to achieve effective energy diversion. Furthermore, after the packer seals, sand particles in the mixture easily settle on the outer surface of the packer, leading to wear of the sealing elements and seal failure, requiring frequent packer replacements. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an oil-water-gas well reservoir expansion sealing jet fluid production and sand removal device, which solves the problem of ineffective energy diversion.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an oil-water-gas well reservoir expansion sealing jet fluid production and sand removal device, comprising a central pipe, and further comprising: an expansion component, the expansion component being located on the periphery of the central pipe, with its lower end positioned on the central pipe and its upper end capable of sliding on the central pipe, for radial expansion under the drive of a power fluid; a jet nozzle, the jet nozzle being located below the central pipe and below the expansion component, the jet nozzle being used to spray power fluid to create a negative pressure zone in the spray area to absorb formation fluid; and a diversion component, comprising an inner pipe passing through the central pipe and diversion joints installed at the upper and lower ends of the central pipe, the lower diversion joint having two channels connecting the jet nozzle and the expansion component, the power fluid passing through the annular channel between the inner pipe and the central pipe reaching the lower diversion joint and being diverted into the jet nozzle and the expansion component; the formation fluid absorbed in the negative pressure zone and the jet fluid mixing in the inner pipe and entering the annulus upwards.

[0006] Furthermore, it also includes anti-settlement components, which include:

[0007] The carrier tube is located above the central tube;

[0008] The sieve plate is rotatably mounted on the outer periphery of the carrier cylinder near the upper part. The upper end of the sieve plate is connected to the upper end of the expansion assembly by a steel rope, and an elastic element is also connected in series on the steel rope.

[0009] Furthermore, the inner tube includes:

[0010] The diffusion segment forms a cavity that is narrow at the bottom and gradually widens at the top;

[0011] An extension tube is connected to the upper end of the diffuser section and extends into the interior of the central tube.

[0012] Furthermore, the jet nozzle is located at the lower end of the diffuser section, and an assembly cylinder is provided above the jet nozzle. A second formation fluid inlet hole is provided on one side of the assembly cylinder for connecting the formation fluid with the negative pressure zone.

[0013] Furthermore, the upper and lower flow dividers are respectively a high-low pressure drain flow divider and a high-low pressure liquid distribution flow divider;

[0014] The jacket of the high and low pressure diversion joint is provided with a power fluid channel 1 along the axial direction and a drain port along the radial direction; the power fluid channel is used to introduce power fluid into the annular channel 1, and the drain port is used to introduce the mixture into the oil jacket annulus;

[0015] The high and low pressure flow divider is located at the lower end of the central tube, and has a power fluid jet channel and a power fluid expansion channel 1 arranged axially inside; the power fluid jet channel is used to supply power fluid to the jet nozzle.

[0016] Furthermore, the liquid-distributing high and low pressure diversion joint is provided with a formation fluid inlet hole one in the radial direction, and the formation fluid inlet hole one is opposite to the formation fluid inlet hole two, for connecting the formation fluid.

[0017] Furthermore, a lower connector is installed around the liquid distribution high and low pressure diversion connector, and an inlet annulus is formed between the lower connector and the liquid distribution high and low pressure diversion connector for the formation fluid to enter the formation fluid inlet hole one.

[0018] Furthermore, the lower end of the liquid-distributing high and low pressure diversion connector is provided with a plug for sealing the lower end of the power liquid jet channel.

[0019] Furthermore, the expansion assembly includes an expansion tube, the lower end of which is fixedly provided with a pressure transmitting short section, the pressure transmitting short section having a pressure transmitting hole along the axial direction, the upper end of which is fixedly provided with a sliding joint, the upper end of which is fixedly provided with a limiting screw sleeve, the sliding joint and the limiting screw sleeve being able to move along the axial direction of the central tube.

[0020] Furthermore, the expanding rubber tube is a cylindrical body with an expanded diameter at both ends, followed by another expanded diameter, and its end is provided with metal threads.

[0021] The present invention has the following beneficial effects:

[0022] (1) The oil-water-gas well reservoir expansion sealing jet fluid production and sand removal device is an integrated design. The device integrates expansion components and jet nozzles, and can complete the two functions of sealing the oil casing annulus and jet fluid production and sand removal in one well run, avoiding the cumbersome process of two well runs in the traditional technology and shortening the operation time.

[0023] (2) In this oil-water-gas well reservoir expansion sealing jet fluid production and sand removal device, the diversion component divides the power fluid injected at the wellhead into two paths: one path enters the gap between the expansion component and the central pipe, driving the expansion sleeve to expand and seal radially; the other path supplies the jet nozzle, generating a high-speed jet to form a negative pressure. Furthermore, due to the throttling effect of the jet nozzle, the pressure in front of the nozzle is always higher than the setting pressure of the expansion sleeve, ensuring that the expansion sleeve continues to seal during the jetting process. Even if the formation pressure fluctuates, the nozzle pressure can still maintain the sealing pressure, avoiding seal failure.

[0024] (3) The oil-water-gas well reservoir expansion sealing jet fluid production and sand removal device is equipped with an anti-settling component. The screen plate of the anti-settling component opens synchronously with the expansion tube to form an annular protective barrier, which prevents sand particles from settling on the outer surface of the expansion tube and reduces the wear rate of the sealing element.

[0025] (4) The oil-water-gas well reservoir expansion sealing jet production and sand removal device has a reasonable mixed liquid path to avoid sand blockage. The mixed liquid is lifted through the inner pipe (diffusion short section + extension pipe) and the path is far away from the packer sealing surface to avoid sand particles from contacting the sealing element.

[0026] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0027] Figure 1 This is an external view of the present invention;

[0028] Figure 2 This is a front view of the internal structure of the present invention;

[0029] Figure 3 This is a diagram showing the expanded rubber tube of the present invention being stretched open;

[0030] Figure 4 For the present invention Figure 2 Enlarged view of area A;

[0031] Figure 5 For the present invention Figure 2 Enlarged view of area B;

[0032] Figure 6 For the present invention Figure 4 A three-dimensional view;

[0033] Figure 7 This is an assembly diagram of the expansion tube and sliding joint of the present invention;

[0034] Figure 8 For the present invention Figure 5 A three-dimensional view;

[0035] Figure 9 This is an assembly diagram of the liquid separation high and low pressure flow divider and the jet nozzle of the present invention;

[0036] Figure 10 For the present invention Figure 9 Exploded view;

[0037] Figure 11 This is an assembly diagram of the high and low pressure drain connector of the present invention inside the carrier cylinder;

[0038] Figure 12 This is a cross-sectional view of the high and low pressure diversion connector for the drainage of the present invention;

[0039] Figure 13 This is an external view of the high and low pressure flow divider of the present invention;

[0040] Figure 14 This is a cross-sectional view of the liquid-dispensing high and low pressure diversion connector of the present invention;

[0041] Figure 15 This is an assembly diagram of the sieve plate and carrier cylinder of the present invention;

[0042] Figure 16 This is a schematic diagram of the sieve plate of the present invention;

[0043] Figure 17 This is a schematic diagram of the structure of the carrier tube of the present invention;

[0044] Figure 18 This is a flow diagram of the power fluid of the present invention;

[0045] Figure 19 This is a flow diagram of the formation fluid of the present invention.

[0046] In the diagram, 1. Expanding sleeve; 2. Central tube; 21. Groove; 3. Pressure transmission sub; 31. Pressure transmission hole; 4. High and low pressure diversion connector; 41. Power fluid expansion channel one; 42. Power fluid jet channel; 43. Formation fluid inlet hole one; 5. Sliding joint; 6. Limiting screw sleeve; 7. High and low pressure diversion connector for drainage; 71. Power fluid channel one; 72. Drainage port; 73. Blind hole; 8. Jet nozzle; 81. Assembly cylinder; 82. Formation fluid inlet hole two; 9. Diffusion sub; 10. Extension tube; 11. Plug; 12. Lower connector; 13. Carrier cylinder; 131. Thickened part; 132. Concave area; 133. Alignment hole; 14. Screen plate; 141. Assembly plate; 15. Steel rope; 151. Elastic element; 16. Annular channel one; 17. Oil pipe; 18. Casing; 19. Inlet annulus. Detailed Implementation

[0047] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0049] The following is based on Figures 1-19 This invention describes an oil-water-gas well reservoir expansion sealing jet fluid production and sand removal device provided in an embodiment of the present invention.

[0050] This invention provides an oil-water-gas well reservoir expansion sealing jet fluid production and sand removal device, including a central pipe 2, an expansion assembly, a jet nozzle 8, and a diversion assembly. The diversion assembly divides the power fluid injected at the wellhead into two paths. One path reaches the jet nozzle 8, creating a negative pressure zone in the injection area to absorb formation fluid and form a mixture, which is then lifted upwards. The other path reaches the expansion assembly, allowing the expansion assembly to expand (acting as a packer), thereby sealing the annulus (the annulus refers to the space between the tubing 17 and the casing 18) and separating the power fluid from the mixture.

[0051] First, describe the expansion components.

[0052] like Figure 1 and Figure 2 As shown, the expansion component is located on the periphery of the central tube 2 and in the central axial region of the central tube 2. Its lower end is positioned on the central tube 2, and its upper end can slide on the central tube 2.

[0053] Specifically, such as Figure 2 , Figures 4-10 As shown, the expansion assembly includes an expansion tube 1, a pressure transmission short section 3 is fixedly provided at the lower end of the expansion tube 1, the pressure transmission short section 3 is provided with a pressure transmission hole 31 along the axial direction, a sliding joint 5 is fixedly provided at the upper end of the expansion tube 1, a limiting screw sleeve 6 is fixedly provided at the upper end of the sliding joint 5, and the sliding joint 5 and the limiting screw sleeve 6 can be displaced along the axial direction of the central tube 2.

[0054] In this embodiment, after the power fluid is diverted by the diversion component, one path enters the pressure transmission hole 31 and then enters the gap between the expansion cylinder 1 and the central tube 2 through the grooves 21 on both sides of the central tube 2. The pressure pushes the expansion cylinder 1 up. At this time, the sliding joint 5 and the limiting screw sleeve 6 slide simultaneously along the axis of the central tube 2 toward the center of the expansion cylinder 1. The outer wall of the expanded cylinder 1 is pressed tightly against the inner wall of the sleeve 18, thereby sealing the sleeve 18. Figure 3 .

[0055] Preferred, such as Figure 2 As shown, the expansion tube 1 is a cylindrical body with an expansion section at both ends, followed by another expansion section, and the end is made of steel threads and special rubber.

[0056] Preferred, such as Figure 2 , Figure 5 and Figure 6 As shown, the sliding joint 5 is a cylindrical body with an external thread at one end and internal sealing surfaces at both ends. The lower internal sealing surface has a reduced-diameter internal thread, and the upper outer periphery has an external thread for connecting the limiting screw sleeve 6. Two O-rings are provided on both internal sealing surfaces.

[0057] Preferred, such as Figure 4As shown, the limiting screw sleeve 6 is a cylindrical body with an internal thread at one end that connects to the sliding joint 5, and a reduced-diameter inner platform at the other end.

[0058] Preferred, refer to Figure 5 and Figure 6 The upper inner wall of the pressure transmission stub 3 is an inner sealing surface. After the inner sealing surface, there is a section of reduced-diameter internal thread for connecting with the lower end thread of the expansion sleeve 1. The lower inner wall of the pressure transmission stub 3 is also an inner sealing surface. After the inner sealing surface, there is also a section of reduced-diameter internal thread for connecting with the upper end thread of the liquid distribution high and low pressure diverter 4 (the liquid distribution high and low pressure diverter 4 will be described below).

[0059] Second, the jet nozzle 8 is described.

[0060] The jet nozzle 8 is located below the central tube 2 and below the expansion assembly. The jet nozzle 8 is used to spray the power fluid. An assembly cylinder 81 is provided above the jet nozzle 8. The assembly cylinder 81 is used to fix the position of the jet nozzle 8 (fixed at the lower end of the diffuser stub 9, which will be described in the flow splitting assembly below). A formation fluid inlet hole 82 is provided on one side of the assembly cylinder 81 to connect the formation fluid with the negative pressure zone (that is, to connect the external space and the internal cavity of the assembly cylinder 81).

[0061] Preferably, the jet nozzle 8 is a cylinder with a conical hole inside, and a spray hole at the upper center connected to the conical hole. The spray hole protrudes on the inner end face. The assembly cylinder 81 has an internal thread for connecting with the diffuser stub 9. The outer surface of the jet nozzle 8 is a sealing surface with two O-rings.

[0062] III. Description of the traffic splitting component.

[0063] like Figure 2 , Figure 4 and Figure 5 As shown, the diversion assembly mainly consists of three parts: an inner tube and diversion connectors at the upper and lower ends. The inner tube passes through the center tube 2, and the diversion connectors are installed at both ends of the center tube 2. The upper and lower diversion connectors are respectively the high-low pressure diversion connector 7 for draining fluid and the high-low pressure diversion connector 4 for distributing liquid. The lower diversion connector (high-low pressure diversion connector 4) has two channels connecting the jet nozzle 8 and the expansion assembly. The power fluid passes through the annular channel 16 between the inner tube and the center tube 2 and reaches the diversion connector, where it is diverted into the jet nozzle 8 and the expansion assembly, thereby realizing the expansion of the expansion sleeve 1 and the spraying of the jet nozzle 8. After the jet nozzle 8 sprays out the power fluid, the formation fluid absorbed in its negative pressure zone is mixed with the jet fluid in the inner tube and enters the annulus of the casing upwards.

[0064] (1) Regarding the inner tube, such as Figure 2 and Figure 5As shown: The inner tube includes a diffuser stub 9 and an extension tube 10 (the jet nozzle 8 is threadedly installed at the lower end of the diffuser stub 9). The diffuser stub 9 forms a chamber that is narrow at the lower end and gradually widens at the upper end. The mixture is mixed in the chamber. The extension tube 10 is connected to the upper end of the diffuser stub 9 and extends into the interior of the central tube 2. An annular channel 16 is formed between the extension tube 10 and the central tube 2.

[0065] Preferred, such as Figure 5 As shown, the diffuser 9 is a cylindrical body with an external thread at the lower end that is compatible with the assembly cylinder 81 and a chamfer on the end face. The other end is provided with an internal thread that is compatible with the extension tube 10. The extension tube 10 is a cylindrical tube with an external thread at the lower end that is compatible with the diffuser 9 and a sealing surface at the upper end.

[0066] (2) Regarding the high and low pressure drain connector 7, in conjunction with Figure 4 , Figure 6 , Figure 7 , Figures 11-13 As shown: The lower end of the high and low pressure drain connector 7 is provided with an internal thread, which is engaged with the external thread at the upper end of the central tube 2, thereby fixing the high and low pressure drain connector 7 to the upper end of the central tube 2. The outer surface of the upper end of the extension tube 10 is sealed with the inner wall of the high and low pressure drain connector 7. The interlayer of the high and low pressure drain connector 7 is provided with a power fluid channel 71 along the axial direction and a drain port 72 along the radial direction. The drain port 72 connects the oil jacket annulus with the central chamber of the high and low pressure drain connector 7. The drain port 72 is used to introduce the mixed liquid into the oil jacket annulus.

[0067] The upper power fluid enters the annular channel 16 through the power fluid channel 71, and then enters the high and low pressure diversion connector 4 for diversion.

[0068] Preferably, the high-low pressure drain connector 7 is a cylinder with an internal thread at its lower end that matches the upper end of the central tube 2. The internal thread has a reduced-diameter sealing surface (sealing with the upper outer surface of the extension tube 10) and is equipped with a sealing ring. A blind hole 73 is provided in the middle of the high-low pressure drain connector 7 (the bottom of the hole is...). Figure 4 The upper end of the high and low pressure diversion connector 7 is an orifice; the upper end of the high and low pressure diversion connector 7 is provided with an external thread, which is compatible with the carrier cylinder 13.

[0069] (3) Regarding the high and low pressure splitter connector 4, as follows Figure 2 , Figure 4 , Figures 8-10 , Figure 13 and Figure 14 As shown.

[0070] The high- and low-pressure diverter 4 is a cylindrical body with different outer diameters, with a larger outer diameter at the upper end and a smaller outer diameter at the lower end. There is a V-shaped reduction in diameter between the upper and lower ends. An external thread is provided on the outer surface of the upper end, which mates with the internal thread at the lower end of the pressure transmission sub-section 3, and a sealing ring is provided. The inner wall of the upper end of the high- and low-pressure diverter 4 serves as a sealing surface, and a sealing ring is provided between it and the outer wall of the lower end of the central tube 2. The inner wall of the lower end of the high- and low-pressure diverter 4 also serves as a sealing surface, and a sealing ring is provided between it and the outer wall of the assembly cylinder 81.

[0071] The upper part of the interlayer with a large outer diameter is provided with a power fluid expansion channel 41 along the axial direction, and the lower part of the interlayer with a small outer diameter is provided with a power fluid jet channel 42 along the axial direction. The power fluid jet channel 42 is used to supply power fluid to the jet nozzle 8. The space between the power fluid jet channel 42 and the power fluid expansion channel 41 serves as a diversion node (this node is located inside the figure-eight-shaped narrowing section). This diversion node is connected to the annular channel 16.

[0072] The high and low pressure diversion connector 4 is provided with a formation fluid inlet hole 43 along the radial direction. The formation fluid inlet hole 43 is opposite to the formation fluid inlet hole 82 and is used to connect the formation fluid.

[0073] Formation fluid is adsorbed by the high-pressure jet and enters the throat (the narrow area at the lower end of the diffuser 9), then enters the diffusion zone to mix, forming a mixed liquid. It then reaches the inner cavity of the high and low pressure diversion joint 7 through the extension pipe 10, and enters the annulus through the drain port 72. Due to the throttling effect of the jet nozzle 8, the pressure of the jet nozzle 8 is always higher than the setting pressure of the expansion sleeve 1. The pressure of the jet nozzle 8 determines the sealing pressure after the expansion sleeve 1 is set. After the expansion sleeve 1 is set, the space between the upper oil pipe 17 and the casing 18 of this device forms a mixed liquid channel (i.e., the aforementioned annulus), and high-pressure jetting is continuously carried out, with the mixed liquid continuously rising to the ground.

[0074] In addition, a lower connector 12 is installed around the liquid distribution high and low pressure diversion connector 4. An inlet annulus 19 is formed between the lower connector 12 and the liquid distribution high and low pressure diversion connector 4 for the formation fluid to enter the formation fluid inlet hole 43.

[0075] Preferably, the lower connector 12 is a cylindrical body, with an internal thread at the upper end that mates with the lower end of the liquid distribution high and low pressure connector 4, and a sealing surface with a reduced diameter connected to the sealing ring threaded connection, and a threaded section at the lower end with a reduced diameter.

[0076] Preferably, the lower end of the high and low pressure diversion connector 4 is provided with a plug 11 for sealing the lower end of the power fluid jet channel 42. The plug 11 is a cylinder with an outer sealing surface on the lower outer wall and a sealing ring on the sealing surface. The upper outer periphery is provided with an external thread.

[0077] To prevent sand from settling onto the outer surface of the expansion sleeve 1 during the lifting of the mixture in the air of the oil sleeve annulus, thus affecting its long-term use, combined with... Figure 1 , Figure 2 , Figure 4 , Figure 7 , Figures 15-17 An anti-settlement component is also provided here, which includes a carrier cylinder 13 and a sieve plate 14.

[0078] The carrier cylinder 13 is located above the central tube 2 and is threadedly connected to the periphery of the high and low pressure diversion joint 7 for drainage. The area near the upper end of the sieve plate 14 is rotatably installed on the periphery of the carrier cylinder 13. The upper end of the sieve plate 14 is connected to the upper end of the expansion assembly via a steel rope 15. An elastic element 151 is also connected in series on the steel rope 15. When the expansion cylinder 1 expands, the sliding joint 5 and the limiting screw sleeve 6 at its upper end slide downwards, and the sieve plate 14 is subjected to downward force by dragging the steel rope 15, so that the sieve plate 14 can open. After it opens, it can block the settled sand, thereby reducing the sealing effect of the sand on the expansion cylinder 1.

[0079] Optionally, the elastic element 151 is an elastic component such as a tension spring or elastic rubber. The elastic element 151 can prevent the timing of the expansion cylinder 1 and the screen plate 14 from interfering with each other. When the expansion cylinder 1 pulls the steel rope 15 downward, the steel rope 15 and the elastic element 151 start to pull the screen plate 14. If the screen plate 14 contacts the inner wall of the sleeve 18 first, the resistance increases sharply. At this time, the elastic element 151 is stretched to absorb this part of the overload stroke and force. The movement of the expansion cylinder 1 can overcome the elastic force of the elastic element 151 and continue to expand until it is completely sealed.

[0080] Preferably, a thickened portion 131 is provided at the lower part of the carrier cylinder 13, and a concave area 132 is formed below the thickened portion 131. Two layers of screen plates 14 are rotatably installed in the concave area 132. Multiple screen plates 14 in each layer form an annular structure. This is because when a single layer of screen plates 14 is opened, there is a gap between two adjacent screen plates 14, and sand will settle through this gap. Therefore, a double layer is set, and the screen plates 14 are staggered vertically, so that the lower layer of screen plates 14 can block the gap between two adjacent upper layer screen plates 14.

[0081] Preferably, in order to facilitate the installation of the screen plate 14, the upper end of the screen plate 14 is provided with an assembly plate 141, the assembly plate 141 is rotatably mounted on the thickened part 131, and the steel rope 15 connects the end of the assembly plate 141 away from the screen plate 14 to the upper end of the expansion assembly.

[0082] Preferably, the carrier cylinder 13 is provided with an alignment hole 133 opposite to the drain port 72.

[0083] When in use (operating), the tubing 17 serves as a flow channel for injecting high-pressure power fluid, and the annulus between the tubing 17 and the casing 18 serves as a mixing and lifting channel for formation fluid and power fluid.

[0084] To clearly show the flow direction of the dynamic fluid and formation fluid, the present invention is shown in a truncated form. Figure 18 and Figure 19 The injected high-pressure power fluid is transported through oil pipe 17 to the upper inner cavity of carrier cylinder 13, and then enters the annular channel 16 formed by central pipe 2 and extension pipe 10 through power fluid channel 71. The flow rate and pressure are transmitted through the annular channel 16 until it reaches the diversion node in the figure-eight-shaped diameter reduction section of the high and low pressure diversion connector 4, where it is divided into two parts:

[0085] The first part passes through the power fluid jet channel 42 and enters the jet nozzle 8 and is ejected. The jet nozzle 8 generates a high-pressure jet, and a negative pressure is generated around the high-pressure jet, causing the formation fluid to enter the negative pressure zone from the inlet annulus 19, the formation fluid inlet hole 1 43 and the formation fluid inlet hole 2 82. The formation fluid is adsorbed by the high-pressure jet and enters the throat (the narrow area at the lower end of the diffuser 9), and then enters the diffusion zone to mix and form a mixed liquid. It then reaches the inner cavity of the high and low pressure diversion joint 7 through the extension pipe 10 and enters the oil jacket annulus through the drain port 72.

[0086] The second part passes through the power hydraulic expansion channel 41 and pressure transmission hole 31 and enters the grooves 21 on both sides of the central tube 2, and enters the gap between the expansion tube 1 and the central tube 2. The pressure supports the expansion tube 1, and the expansion tube 1 drives the sliding joint 5 and the limiting screw sleeve 6 to slide along the axis of the central tube 2 toward the center of the expansion tube 1. The outer wall of the expanded tube 1 is tightly against the inner wall of the sleeve 18, sealing the sleeve 18. At the same time, the limiting screw sleeve 6 applies a downward pulling force to the steel rope 15, so that the screen plate 14 can open. After it opens, it can block the settled sand, thereby reducing the impact of sand on the sealing of the expansion tube 1.

[0087] After the expansion tube 1 is supported, due to the throttling effect of the jet nozzle 8, the pressure in front of the jet nozzle 8 is always higher than the sealing pressure of the expansion tube 1. The pressure in front of the nozzle determines the sealing pressure after the expansion tube 1 is sealed.

Claims

1. A reservoir expansion and sealing jet fluid production and sand removal device for oil, water and gas wells, comprising a central pipe (2), characterized in that, Also includes: An expansion assembly is located on the periphery of the central tube (2), with its lower end positioned on the central tube (2) and its upper end able to slide on the central tube (2). The expansion assembly includes an expansion tube (1), with a pressure transmission short section (3) fixedly provided at the lower end of the expansion tube (1). The pressure transmission short section (3) is provided with a pressure transmission hole (31) along the axial direction. A sliding joint (5) is fixedly provided at the upper end of the expansion tube (1), and a limiting screw sleeve (6) is fixedly provided at the upper end of the sliding joint (5). The sliding joint (5) and the limiting screw sleeve (6) can be displaced along the axial direction of the central tube (2). The jet nozzle (8) is located below the central tube (2) and below the expansion assembly. The jet nozzle (8) is used to spray dynamic fluid to create a negative pressure zone in the spray area to absorb formation fluid. The diversion assembly includes an inner tube that passes through the center tube (2) and diversion connectors installed at the upper and lower ends of the center tube (2). The lower diversion connector has two channels that connect the jet nozzle (8) and the expansion assembly. The power fluid passes through the annular channel 1 (16) between the inner tube and the center tube (2) and then reaches the lower diversion connector where it is diverted into the jet nozzle (8) and the expansion assembly. The upper and lower flow dividers are respectively the high and low pressure flow divider for liquid discharge (7) and the high and low pressure flow divider for liquid distribution (4). The jacket of the high and low pressure diversion joint (7) is provided with a power fluid channel (71) along the axial direction and a drain port (72) along the radial direction. The power fluid channel (71) is used to introduce the power fluid into the annular channel (16), and the drain port (72) is used to introduce the mixture into the oil jacket annulus. The high and low pressure flow divider (4) is located at the lower end of the central tube (2). Inside, there is a power fluid jet channel (42) and a power fluid expansion channel (41) along the axial direction. The power fluid jet channel (42) is used to supply power fluid to the jet nozzle (8). The formation fluid absorbed in the negative pressure zone mixes with the jet fluid inside the inner tube and then enters the annulus of the oil casing upwards.

2. The oil-water-gas well reservoir expansion sealing jet fluid production and sand removal device according to claim 1, characterized in that, It also includes anti-settlement components, which include: The carrier tube (13) is located above the central tube (2); The screen plate (14) is rotatably mounted on the periphery of the carrier cylinder (13) in the area near the upper end. The upper end of the screen plate (14) is connected to the upper end of the expansion assembly by a steel rope (15). An elastic element (151) is also connected in series on the steel rope (15).

3. The oil-water-gas well reservoir expansion sealing jet fluid production and sand removal device according to claim 1, characterized in that, The inner tube includes: The diffusion segment (9) forms a cavity that is narrow at the bottom and gradually widens at the top; An extension tube (10) is connected to the upper end of the diffuser section (9) and extends into the interior of the central tube (2).

4. The oil-water-gas well reservoir expansion sealing jet fluid production and sand removal device according to claim 3, characterized in that, The jet nozzle (8) is located at the lower end of the diffuser section (9). An assembly cylinder (81) is provided above the jet nozzle (8). A formation fluid inlet hole (82) is provided on one side of the assembly cylinder (81) to connect the formation fluid with the negative pressure zone.

5. The oil-water-gas well reservoir expansion sealing jet fluid production and sand removal device according to claim 4, characterized in that, The liquid-distributing high and low pressure diversion connector (4) is provided with a formation liquid inlet hole one (43) in the radial direction. The formation liquid inlet hole one (43) is opposite to the formation liquid inlet hole two (82) and is used to connect the formation liquid.

6. The oil-water-gas well reservoir expansion sealing jet fluid production and sand removal device according to claim 5, characterized in that, A lower connector (12) is installed around the liquid distribution high and low pressure diversion connector (4). An inlet annulus (19) is formed between the lower connector (12) and the liquid distribution high and low pressure diversion connector (4) for the formation fluid to enter the formation fluid inlet hole one (43).

7. A reservoir expansion and sealing jet fluid production and sand removal device for oil, water, and gas wells according to any one of claims 5-6, characterized in that, The lower end of the liquid-distributing high and low pressure diversion connector (4) is provided with a plug (11) for sealing the lower end of the power liquid jet channel (42).

8. The oil-water-gas well reservoir expansion sealing jet fluid production and sand removal device according to claim 7, characterized in that, The expansion tube (1) is a cylindrical body.

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