Flow regulating and water controlling tool

Abstract

The utility model relates to the technical field of oil extraction from a well, in particular to a flow adjusting and water controlling tool which comprises a pipe body, the pipe body comprises a central pipe, a water controlling valve is arranged on the central pipe, the pipe body further comprises an outer cylinder body arranged on the central pipe in a sleeved mode, the outer cylinder body comprises a screen pipe and a sealing pipe, and the sealing pipe is arranged on the periphery, located at the water controlling valve, of the central pipe in a sealed mode. The screen pipe is located above the sealing pipe, and the outer barrel is assembled on the center pipe through a shear pin so that the shear pin can be sheared off to drive the outer barrel to slide down when pressure is applied to the interior of the center pipe, and the screen pipe can be located on the periphery of the water control valve. In this way, formation fluid can flow into the water control valve through the screen pipe and then flow into the inner cavity of the oil pipe, so that the functions of flow regulation and water control are achieved, the outer barrel structure can also be suitable for being used in a hydraulic setting packer, and it is guaranteed that the application range is larger.

Description

Technical Field

[0001] The utility model relates to the technical field of oil production in wells, in particular to a flow regulating and water controlling tool. Background Art

[0002] During the development of oil reservoirs, affected by the energy of formation edge and bottom water and injected formation water, as well as the difference in mobility of different formation fluids, formation pressure and suction pressure, water flow dominant channels are easily formed in the formation, resulting in water cones, water channeling, and water ridges. Water quickly appears in the oil wells. In order to achieve stable oil and water control, a mechanical intelligent flow control and water control technology is currently used. The difference in viscosity and inertia between oil and water is used to add different flow friction resistances. The friction resistance is low when encountering oil and high when encountering water, which plays the role of automatically throttling low-viscosity fluids such as water and opening up high-viscosity fluids such as oil.

[0003] For example, the Chinese utility model patent with the authorization announcement number CN209195372U discloses a flow regulating and water control screen tube, which realizes flow regulating and water control by utilizing the different viscosities of oil and water. Specifically, the flow regulating and water control screen tube mainly comprises: a filtering channel is formed between the screen tube and the base pipe; the first end of the butt joint is connected to the screen tube, and the second end is connected to the protective tube, and a flow passage is formed between the butt joint and the base pipe; a flow regulating center tube is arranged between the protective tube and the base pipe, and a rectifying channel is formed between the flow regulating center tube and the protective tube, and the first end of the flow passage is connected to the filtering channel, and the second end is connected to the rectifying channel; a water control valve plate is arranged in the rectifying channel, and the water control valve plate is connected to the base pipe; the first valve plate and the second valve plate are arranged oppositely; the opening is respectively connected to the rectifying channel and the outer flow channel, the outer flow channel is connected to the inner flow channel through a number of connecting channels, the flow regulating channel is connected to the inner flow channel, the flow regulating channel is connected to the liquid outlet channel, and the liquid outlet channel is connected to the base pipe; the flow flow of the inner flow channel is smaller than the flow flow of the outer flow channel, so as to realize sand prevention and flow regulating and water control.

[0004] Similarly, the intelligent water control string for cementing completed oil wells disclosed in the Chinese utility model patent with authorization announcement number CN204283380U, and the oil production water control valve with floating plate and supporting tools disclosed in the Chinese utility model patent with authorization announcement number CN218563632U can also achieve sand prevention and flow control. However, the water control valves in the above patents can connect the inner cavity of the oil pipe and the annulus of the oil casing through an external screen pipe, and cannot form a sealed isolation, resulting in the inability to hold pressure in the inner cavity of the string where the tool is located and form a pressure difference with the outer annulus. Therefore, it cannot be used with a conventional hydraulically sealed packer. Utility Model Content

[0005] The utility model aims to provide a flow regulating and water controlling tool, which is used to solve the problem that the existing flow regulating and water controlling tool cannot be adapted for use with a hydraulically set packer.

[0006] The utility model adopts the following technical scheme: a flow regulating and water controlling tool, comprising a pipe body, the pipe body comprising a central pipe, a water control valve being arranged on the central pipe, the pipe body also comprising an outer cylinder body sleeved on the central pipe, the outer cylinder body comprising a screen tube and a sealing tube, the sealing tube being sealingly arranged on the outer periphery of the central pipe at the water control valve, the screen tube being located above the sealing tube, the outer cylinder body being assembled on the central pipe by shear nails, so that when pressure is applied to the central pipe, the shear nails are cut off to drive the outer cylinder body to slide down so that the screen tube is located at the outer periphery of the water control valve.

[0007] Furthermore, the outer cylinder also includes a mounting ring located above the screen pipe, two ends of the screen pipe are respectively connected to the mounting ring and the sealing pipe, and the shear nails are assembled on the mounting ring.

[0008] Furthermore, sealing rings are provided between the upper and lower ends of the sealing tube and the central tube respectively.

[0009] Furthermore, the central tube is provided with a limiting structure for the outer cylinder at a position below the outer cylinder so that the screen tube is located at a peripheral position of the water control valve after the outer cylinder slides down.

[0010] Furthermore, the limiting structure is a limiting nut arranged on the outer periphery of the central tube.

[0011] Furthermore, the central pipe includes a reduced diameter section, and the water control valve is assembled on the reduced diameter section.

[0012] Furthermore, a plurality of mounting holes are provided on the reduced diameter section, some of the mounting holes are equipped with the water control valve, and the remaining mounting holes are equipped with plugs.

[0013] Furthermore, the water control valve and the plug are both assembled with the mounting hole through threaded connection.

[0014] Furthermore, the screen tube is a wire-wound tube, and the wire-wound tube includes inner supporting ribs and outer wires.

[0015] The flow regulating and water controlling tool of the present invention improves the existing flow regulating and water controlling tools. The beneficial effects of the flow regulating and water controlling tool of the present invention are as follows: by arranging the outer cylinder with a screen tube and a sealing tube, when entering the well, the water control valve on the central tube is placed on the inner side of the outer cylinder, and the sealing tube is placed on the outer periphery of the water control valve, so that the inner and outer cavities of the central tube are isolated and sealed, so that the pressure in the tube can be built up to seal the packer. After the packer is sealed, the pressure is increased to cut the shear pins and drive the outer cylinder downward, so that the water control valve is placed in the inner cavity position of the screen tube. In this way, the formation fluid can flow into the water control valve through the screen tube and then flow into the inner cavity of the oil pipe, thereby playing the role of flow regulating and water controlling. This outer cylinder structure can also be suitable for use with hydraulically sealed packers, ensuring a wider range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1This is a structural schematic diagram of an embodiment of the flow regulating and water controlling tool of the utility model before the pressure is held;

[0017] Figure 2 It is a structural schematic diagram of an embodiment of the flow regulating and water controlling tool of the utility model after pressure is held.

[0018] In the figure: 1. upper joint; 2. center tube; 3. mounting ring; 4. shear nail; 5. wire winding tube; 6. sealing tube; 7. plug; 8. water control valve; 9. limit nut; 501. inner supporting rib; 502. outer wire winding; 801. valve cap; 802. valve core; 803. valve seat. DETAILED DESCRIPTION

[0019] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0020] First, the technical solution of the utility model is generally described as follows:

[0021] The utility model is based on the existing flow regulating and water control tools, because the screen tube is located at the periphery of the water control valve, so that the inner and outer annuli of the oil pipe are in a connected state, and when the existing hydraulic sealing packer is used, it is necessary to pressurize the oil pipe to make the pressure in the oil pipe greater than the oil casing annulus, so as to seal the packer, but the screen tube of the existing flow regulating and water control tools makes the inner cavity of the oil pipe and the oil casing annulus in a non-sealed isolation state, so it cannot be used with the hydraulic sealing packer.

[0022] Based on the above problems, the utility model designs a flow regulating and water control tool for a hydraulically sealed packer, and conceives how to make the inside and outside of the oil pipe sealed when the packer is set, and not affect the use of the screen tube after the setting is completed, so as to achieve the effect of flow regulating and water control. The following technical scheme is specifically adopted: the flow regulating and water control tool of the utility model includes a pipe body, the pipe body includes a center pipe, and a water control valve is arranged on the center pipe. The pipe body also includes an outer cylinder body sleeved on the center pipe. By arranging the outer cylinder body with a screen tube and a sealing tube, when entering the well, the water control valve on the center pipe is placed on the inner side of the outer cylinder body. The sealing tube is located at the periphery of the water control valve, so that the inner and outer cavities of the central tube are isolated and sealed, the screen tube is located above the sealing tube, and the outer cylinder is assembled on the central tube through shear nails. The pressure in the tube is built up to seal the packer. After the packer is sealed, the outer cylinder has a pressure-bearing surface. The pressure is increased so that the pressure-bearing surface of the outer cylinder is subjected to a greater pressure and has a tendency to move downward, thereby shearing the shear nails under the action of pressure, driving the outer cylinder downward, and placing the screen tube at the periphery of the water control valve, thereby playing a role in regulating flow and controlling water. This outer cylinder structure can also be applied to hydraulically sealed packers, ensuring a wider range of applications.

[0023] Specific embodiments of the flow regulating and water controlling tool of the utility model:

[0024] The structural schematic diagram of the flow control tool of the utility model is as follows Figure 1-2 As shown, a flow regulating and water controlling tool comprises a pipe body, the pipe body comprises a central pipe 2, the upper end of the central pipe 2 is threadedly connected with an upper joint 1, the interior of the central pipe 2 is an inner cavity of an oil pipe, a water control valve 8 is arranged on the central pipe 2 for regulating flow and controlling water, the pipe body also comprises an outer cylinder body sleeved on the central pipe 2, the outer cylinder body comprises a screen tube and a sealing tube 6, the sealing tube 6 is sealingly arranged on the outer periphery of the central pipe 2 located at the water control valve 8, the sealing tube 6 is used to seal the inside and outside of the oil pipe before the oil pipe is pressurized and the packer is set, the screen tube is located above the sealing tube 6, the screen tube is used to filter the water-oil mixture after the packer is set, the outer cylinder body is assembled on the central pipe 2 by shear nails 4, the outer cylinder body has a pressure-bearing surface, so that when pressure is applied to the central pipe 2, the outer cylinder body has a downward movement tendency to cut the shear nails 4, and drives the outer cylinder body to slide down so that the screen tube is located at the peripheral position of the water control valve 8.

[0025] Since the screen tube of the outer cylinder is located above the sealing tube 6, the shearing nails 4 can be directly assembled on the upper end of the screen tube, but the screen tube also needs to play a filtering role, so it is generally a mesh structure. The assembly effect of assembling the shearing nails 4 on the screen tube is not good, and the shearing force of the shearing nails 4 is insufficient when shearing, which may cause damage to the screen tube. Preferably, the outer cylinder also includes a mounting ring 3 above the screen tube, and the two ends of the screen tube are respectively connected to the mounting ring 3 and the sealing tube 6, and the shearing nails 4 are assembled on the mounting ring 3. In this way, the shearing nails 4 are assembled through the mounting ring 3, and the structure is more reliable, which is more reliable than directly assembling on the screen tube.

[0026] Specifically, when considering how to achieve sealing of the sealing tube 6, in order to ensure good sealing performance and make the sealing structure simpler and easier to assemble, preferably, sealing rings are respectively arranged between the upper and lower ends of the sealing tube 6 and the center tube 2. The sealing rings are arranged at the upper and lower ends of the sealing tube 6 to achieve sealing. The structure is simple and the sealing effect is better. It can also make the fit between the sealing tube 6 and the center tube 2 more reliable, and the center tube 2 can play a certain supporting role for the sealing tube 6. Of course, in other embodiments, radial outer convex rings are arranged at both ends of the sealing tube 6 facing the center tube 2. The outer convex rings fit the center tube 2 and are arranged to guide the sliding, which can also achieve the sealing effect on the sealing tube 6.

[0027] In order to ensure that the screen tube can be accurately located at the peripheral position of the water control valve 8 during the sliding process of the outer cylinder, in this embodiment, preferably, the center tube 2 is located below the outer cylinder and is provided with a limiting structure for the outer cylinder. The outer cylinder is limited by the limiting structure so that the screen tube is located at the peripheral position of the water control valve 8 after the outer cylinder slides down.

[0028] Specifically, the limiting structure can be achieved by providing a block or a bar or other structure on the periphery of the central tube 2 to limit the outer cylinder. However, in order to facilitate the adjustment of the structure and facilitate assembly, preferably, the limiting structure is a limiting nut 9 provided on the periphery of the central tube 2. By screwing the limiting nut 9 on the periphery of the central tube 2, the outer cylinder is stopped when it descends to the limiting nut 9, ensuring that the screen tube is just located at the periphery of the water control valve 8, thereby ensuring a good flow regulation and water control effect. The limiting nut 9 can also play a certain supporting role for the outer cylinder.

[0029] Since the water control valve 8 needs to be installed on the central tube 2, the water control valve 8 occupies a certain space. When the outer cylinder is sleeved on the central tube 2, a certain distance may be generated between the outer cylinder and the central tube 2, thereby increasing the overall size of the structure. Therefore, in this embodiment, preferably, the central tube 2 includes a reduced diameter section, and the water control valve 8 is installed on the reduced diameter section. In this way, the central tube 2 is narrower in size at the position where the water control valve 8 is installed, and the water control valve 8 is the same as the original size after installation. The outer cylinder can be set to fit the central tube 2, making the overall structure more compact and convenient for installing the water control valve 8.

[0030] Specifically, the outer diameter of the upper center tube of the reduced diameter section is larger than the outer diameter of the lower center tube. The lower end of the sealing tube 6 has an inner convex ring facing the center. The inner convex ring and the sealing tube 6 are sealed by a sealing ring. The upper end surface of the inner convex ring constitutes the pressure-bearing surface of the outer cylinder. When pressure is applied to the tube, it withstands pressure so that the outer cylinder has a tendency to move downward, so that the shear nails 4 have shear force to achieve a shearing effect, causing the outer cylinder to move downward.

[0031] Specifically, in order to improve the versatility of flow regulation and water control, it is not necessary to design different water control valves 8 for different water-oil working conditions. Preferably, a plurality of mounting holes are provided on the reduced diameter section, some of the mounting holes are equipped with water control valves 8, and the remaining mounting holes are equipped with plugs 7. By matching the plugs 7 on the central pipe 2, the number of water control valves 8 can be selected according to the working conditions of the formation, and there is no need to redesign the flow parameters and structure of the water control valves 8, which is conducive to reducing the processing cost.

[0032] In order to facilitate the assembly of the water control valve 8 and the plug 7, a plurality of mounting holes are provided on the reduced diameter section, the mounting holes are threaded through holes, the water control valve 8 and the plug 7 are provided with external threads, and the water control valve 8 and the plug 7 are assembled with the mounting holes through threaded connection. This makes the structure simpler, the assembly more convenient, and the operation is convenient when replacing the water control valve 8 and the plug 7. Of course, in its implementation mode, the water control valve 8 and the plug 7 can also be installed on the pipe wall around the mounting hole by connecting bolts.

[0033] Since the screen tube needs to withstand the impact of various oils, water and impurities, in order to improve the structural strength of the screen tube and improve the impact resistance, preferably, the screen tube is a wire-wound tube 5, and the wire-wound tube 5 includes an inner support rib 501 and an outer wire 502. The inner support ribs 501 are distributed on the outer periphery of the central tube 2, and the outer wire 502 is wound on each inner support rib 501 to form the wire-wound tube 5, so that the structural strength of the screen tube is higher and the service life is longer. Of course, in other embodiments, the screen tube can also use an ordinary filter tube, and uniform pores are opened on the tube body to achieve filtering.

[0034] Specifically, the water control valve 8 can adopt the water control valve 8 commonly used in the prior art. The water control valve 8 of this embodiment includes a valve cap 801, a valve core 802 and a valve seat 803. Since the viscosity of oil and water is different, the viscosity of water is small. According to Bernoulli's principle, when water enters the inner cavity of the water control valve 8 from the central flow channel on the valve cap 801, it bypasses the valve core 802 and flows to the through connecting hole on the valve seat 803. A large throttling pressure difference will be generated, prompting the valve core 802 to be sucked toward the valve cap 801, reducing the flow channel or even closing the flow channel. The viscosity of oil is large. When oil passes through the water control valve 8, resistance will be generated, resulting in a loss of throttling pressure difference, thereby playing a role in regulating flow and controlling water.

[0035] When implementing downhole flow regulation and water control, the utility model is connected to the production pipe of the packer, and the utility model is installed in each separation layer section. The number of water control valves 8 on the utility model is designed and selected according to the oil layer parameters and production parameters of each production layer section. When the inner cavity of the oil pipe is pressurized to seal the packer, the inner cavity of the oil pipe is sealed and isolated from the oil casing annulus due to the sealed contact between the sealing tube 6 and the center pipe 2, and the pressure can be built up to seal the packer. During the process of building up pressure in the oil pipe, the inner diameter of the sealing contact surface at the lower end of the sealing tube 6 is smaller than the inner diameter of the sealing contact surface at the upper end, and the sealing tube 6 body is always subjected to a downward force; after the packer is sealed, the pressure in the oil pipe is increased, increasing the downward force on the sealing tube 6, and this force acts on the wire wrapping tube 5 connected to the sealing tube 6, and the shear nails 4 of the mounting ring 3 connected to the wire wrapping tube 5. The shear nails 4 are cut off under the downward force, and the sealing tube 6 is brought down with the wire wrapping tube 5 and the mounting ring 3. When it reaches the upper end surface of the limiting nut 9, the wire winding tube 5 is now located outside the plug 7 and the water control valve 8, and the center tube 2 is in contact with the mounting ring 3 and the sealing tube 6 to form a seal; during production, the oil-water mixture produced by each layer passes through the wire winding tube 5 of the corresponding layer into the annular space between the wire winding tube 5 and the center tube 2, and then enters the water control valve 8. Due to the different viscosities of oil and water, the viscosity of water is small. According to the Bernoulli principle, when water enters the water control valve 8, a large throttling pressure difference will be generated, reducing the flow channel or even closing the flow channel. The viscosity of oil is large. When the oil passes through the water control valve 8, resistance will be generated, resulting in a loss of throttling pressure difference, thereby playing a role in regulating flow and controlling water.

[0036] Through the above description of the specific embodiments of the flow regulating and water control tool of the utility model, it can be seen that the flow regulating and water control tool of the utility model is provided with a screen tube and a sealing tube in the outer cylinder. When entering the well, the water control valve on the central tube is placed on the inner side of the outer cylinder, and the sealing tube is placed on the outer periphery of the water control valve, so that the inner and outer cavities of the central tube are isolated and sealed, so that the pressure in the tube can be built up to seal the packer. After the packer is sealed, the pressure is increased to cut the shear pins and drive the outer cylinder downward, so that the water control valve is placed in the inner cavity of the screen tube. In this way, the formation fluid can flow into the water control valve through the screen tube and then flow into the inner cavity of the oil pipe, thereby playing the role of flow regulating and water control. This outer cylinder structure can also be suitable for use with hydraulically sealed packers, ensuring a wider range of applications.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flow regulating and water controlling tool, comprising a pipe body, the pipe body comprising a central pipe, a water control valve is arranged on the central pipe, and the characteristics are: The pipe body also includes an outer cylinder body sleeved on the central pipe, the outer cylinder body includes a screen tube and a sealing tube, the sealing tube is sealingly arranged on the outer periphery of the central pipe located at the water control valve, the screen tube is located above the sealing tube, and the outer cylinder body is assembled on the central pipe by shear nails, so that when pressure is applied to the central pipe, the shear nails are cut off to drive the outer cylinder body to slide down so that the screen tube is located at the outer periphery of the water control valve.

2. The flow regulating and water controlling tool according to claim 1 is characterized in that: The outer cylinder also includes a mounting ring located above the screen pipe, two ends of the screen pipe are respectively connected to the mounting ring and the sealing pipe, and the shear nails are assembled on the mounting ring.

3. The flow regulating and water controlling tool according to claim 1 or 2, characterized in that: Sealing rings are arranged between the upper and lower ends of the sealing tube and the central tube respectively.

4. The flow regulating and water controlling tool according to claim 1 or 2, characterized in that: The central tube is located below the outer cylinder and is provided with a limiting structure for the outer cylinder so that the screen tube is located at the periphery of the water control valve after the outer cylinder slides down.

5. The flow regulating and water controlling tool according to claim 4 is characterized in that: The limiting structure is a limiting nut arranged on the outer periphery of the central tube.

6. The flow regulating and water controlling tool according to claim 1 or 2, characterized in that: The central pipe comprises a reduced diameter section, and the water control valve is assembled on the reduced diameter section.

7. The flow regulating and water controlling tool according to claim 6 is characterized in that: A plurality of mounting holes are arranged on the reduced diameter section, some of the mounting holes are equipped with the water control valve, and the remaining mounting holes are equipped with plugs.

8. The flow regulating and water controlling tool according to claim 7 is characterized in that: The water control valve and the plug are both assembled with the mounting hole through threaded connection.

9. The flow regulating and water controlling tool according to claim 1 or 2, characterized in that: The screen tube is a wire-wound tube, which comprises inner supporting ribs and outer wires.

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