Underground adjustable sand prevention throttling device and throttling method

Abstract

The underground adjustable sand prevention throttling device comprises a throttler body, a setting ring and a sealing ring are sequentially arranged on the portion, close to the input end, of the side wall of the throttler body in a sleeving mode, a counter bore is formed in the input end of the throttler body, one end of a sand prevention sleeve is arranged in the counter bore in a matched mode, and the outer wall of the sand prevention sleeve is sleeved with a guide protection sleeve; the invention further discloses a throttling method of the underground adjustable sand prevention throttling device, the distance between the adjusting cone and the adjusting ring is adjusted, and the throttling device body is thrown into a shaft through a throwing-in and pulling device; the guiding protection sleeve is in threaded connection with the throttling device body, the guiding protection sleeve is in clamped connection with the other end of the sand prevention sleeve, and an adjusting assembly is installed on the inner wall of the throttling device body. The problem that in the prior art, a throttling device cannot adjust the flow volume in different scenes is solved.

Description

Technical Field

[0001] This invention belongs to the technical field of downhole throttling devices, and relates to an adjustable downhole sand control throttling device. This invention also relates to a throttling method for the aforementioned adjustable downhole sand control throttling device. Background Technology

[0002] During the process of natural gas flowing from the formation through the wellbore to the surface, high pressure, low temperature, and water content can easily lead to the formation of hydrates. The higher the pressure, the higher the temperature at which hydrates form, making hydrate blockage more likely. This blockage can clog the wellbore production string and surface pipelines, affecting gas well production. Downhole throttling technology involves installing a downhole throttling device at an appropriate location within the tubing. This allows for throttling and pressure reduction within the wellbore. Simultaneously, it utilizes formation heat energy to heat the low-temperature natural gas after throttling, reducing the pressure of the throttled natural gas and the temperature at which hydrates form. This helps prevent hydrate blockage and improves gas well production.

[0003] Downhole chokes are installed using a dropper. During installation, the outer wall of the choke is pressed against the inner wall of the wellbore for positioning. Then, a sealing press is applied to the inner wall to seal it, allowing natural gas to flow only through the central aperture, thus achieving a choke effect. Existing downhole chokes use a filter sleeve with numerous perforations. Natural gas enters the choke through these perforations, while sand is blocked on the outside of the filter sleeve, protecting it during deployment. A protective cover is usually threaded onto the end of the choke to cover the filter sleeve. However, in actual use, the existing downhole chokes use threaded connections for both the filter sleeve and the outer protective cover, making disassembly and assembly inconvenient for cleaning the filter sleeve. Furthermore, cleaning the filter sleeve requires additional tools, making the cleaning process inconvenient. Summary of the Invention

[0004] The purpose of this invention is to provide an adjustable downhole sand control and throttling device, which solves the problem in the prior art that the throttling device cannot adjust the flow rate for different scenarios.

[0005] Another objective of this invention is to provide a throttling method for the aforementioned adjustable downhole sand control throttling device, which solves the problems of difficult assembly and cleaning of sand control components.

[0006] The technical solution adopted in this invention is an adjustable downhole sand control and throttling device, including a throttling device body. A seat seal ring and a sealing ring are sequentially fitted on the side wall of the throttling device body near the input end. A countersunk hole is opened at the input end of the throttling device body. One end of a sand control sleeve is fitted inside the countersunk hole. A guide protective sleeve is fitted on the outer wall of the sand control sleeve. The guide protective sleeve is threadedly connected to the throttling device body. The guide protective sleeve is snapped into the other end of the sand control sleeve. An adjustment component is installed on the inner wall of the throttling device body.

[0007] The invention is further characterized by:

[0008] The adjustment assembly includes a screw, one end of which passes through the mounting base and is connected to an adjustment cone. The other end of the screw is connected to a knob, which is located near the guide protective sleeve. The adjustment cone is fitted with an adjustment ring, the outer wall of which is connected to the inner wall of the throttle body. The mounting base is also connected to the inner wall of the throttle body.

[0009] The outer wall of the knob is decorated with anti-slip textures at equal intervals.

[0010] The bottom diameter of the adjusting cone is greater than the top diameter of the adjusting cone, the bottom of the adjusting cone is perpendicularly connected to the screw, and the inner diameter of the adjusting ring is not greater than the bottom diameter of the adjusting cone.

[0011] A rubber gasket is provided between the countersunk hole and the sandproof sleeve.

[0012] A connecting ring is connected to the center of the sand-proof sleeve away from the throttle body port. The connecting ring is located between the sand-proof sleeve and the guide protective sleeve. The axis of the connecting ring coincides with the axis of the sand-proof sleeve. A connecting post is provided at the position opposite to the connecting ring of the guide protective sleeve. The connecting ring and the connecting post cooperate with each other.

[0013] The outer wall of the input end of the throttle body is provided with an external thread, and the inner wall of the guide protective sleeve near the port of the throttle body is provided with an internal thread, with the external thread and the internal thread engaging.

[0014] The inner wall of the guide sleeve is equipped with bristles near the internal thread.

[0015] The sand-proof sleeve has several equally spaced sand-proof holes, and the guide protective sleeve has several elongated through holes on its side wall.

[0016] Another technical solution adopted in this invention is a throttling method using a downhole adjustable sand control and throttling device, comprising the following operating steps:

[0017] Step 1: Rotate the knob to adjust the distance between the adjusting cone and the adjusting ring;

[0018] Step 2: Use the retrieval tool to drop the throttle body into the wellbore;

[0019] Step 3: The operation of the retrieval device drives the seat ring and sealing ring on the throttle body to be opened, thereby limiting the throttle body in the wellbore;

[0020] Step 4: The fluid in the wellbore enters the regulating assembly through the sand control sleeve to complete sand control and flow regulation.

[0021] The beneficial effects of this invention are as follows: By adjusting the structure of the guide sleeve and the sand-proof sleeve, during installation, it is only necessary to insert the sand-proof sleeve into the countersunk hole for quick assembly, simplifying the assembly steps. At the same time, the connecting column presses the sand-proof sleeve while the guide sleeve is threadedly connected to the throttle body, thus fixing the sand-proof sleeve to the throttle body. The bristles on the inner wall of the guide sleeve can automatically brush away the sand and gravel adhering to the outer wall of the sand-proof sleeve during the process of disassembling the guide sleeve and the sand-proof sleeve, eliminating the need to find separate tools for cleaning, making it more convenient to use. Furthermore, the bristles can work to clean while disassembling and assembling the sand-proof sleeve and the guide sleeve, further saving cleaning steps. By setting an adjustment component at the inlet end of the throttle body, the adjustment component can adjust the flow rate of the fluid inside the throttle body, thereby realizing the adjustment function and improving the adaptability of the throttle body, enabling it to adapt to various different scenarios. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the downhole adjustable sand control and throttling device of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the input end of the throttle body of the adjustable sand control throttle device for downhole applications of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the sand-control sleeve and guide protective sleeve of the adjustable sand-control and throttling device for downhole applications of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the adjusting component of the downhole adjustable sand control and throttling device of the present invention;

[0026] Figure 5 This is a cross-sectional schematic diagram of the sand control sleeve and guide protective sleeve of the adjustable sand control and throttling device for downhole applications of the present invention.

[0027] In the diagram, 1. Throttling device body, 2. Sealing ring, 3. Sealing ring, 4. Countersunk hole, 5. Sandproof sleeve, 6. Guide protective sleeve, 7. Adjusting component, 71. Mounting base, 72. Anti-slip texture, 73. Screw, 74. Adjusting cone, 75. Adjusting ring, 76. Knob, 8. Rubber washer, 9. Connecting ring, 10. Connecting post, 11. Internal thread, 12. External thread, 13. Sandproof hole, 14. Brush bristles, 15. Through hole. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0029] The downhole adjustable sand control and throttling device of the present invention, such as Figure 1 As shown, the device includes a throttle body 1. A sealing ring 2 and a sealing ring 3 are sequentially fitted on the side wall of the throttle body 1 near the input end. A countersunk hole 4 is provided at the input end of the throttle body 1. One end of a sandproof sleeve 5 is fitted inside the countersunk hole 4. A guide protective sleeve 6 is fitted on the outer wall of the sandproof sleeve 5. The guide protective sleeve 6 is threadedly connected to the throttle body 1. The guide protective sleeve 6 is snapped into the other end of the sandproof sleeve 5. An adjustment component 7 is installed on the inner wall of the throttle body 1.

[0030] like Figure 4 As shown, the adjustment assembly 7 includes a screw 73. One end of the screw 73 passes through the mounting base 71 and is connected to an adjustment cone 74. The other end of the screw 73 is connected to a knob 76. The knob 76 is located near the guide protective sleeve 6. The adjustment cone 74 is fitted with an adjustment ring 75. The outer wall of the adjustment ring 75 is connected to the inner wall of the throttle body 1. The mounting base 71 is connected to the inner wall of the throttle body 1.

[0031] The outer wall of the knob 76 is provided with anti-slip textures 72 at equal intervals.

[0032] The bottom diameter of the adjusting cone 74 is larger than the top diameter of the adjusting cone 74. The bottom of the adjusting cone 74 is perpendicularly connected to the screw 73. The inner diameter of the adjusting ring 75 is not larger than the bottom diameter of the adjusting cone 74.

[0033] like Figure 2 As shown, a rubber gasket 8 is provided between the countersunk hole 4 and the sandproof sleeve 5.

[0034] like Figure 5 As shown, a connecting ring 9 is connected to the sandproof sleeve 5 at the center of the port away from the throttle body 1. The connecting ring 9 is located between the sandproof sleeve 5 and the guide protective sleeve 6. The axis of the connecting ring 9 coincides with the axis of the sandproof sleeve 5. A connecting post 10 is provided at the position opposite to the connecting ring 9 of the guide protective sleeve 6. The connecting ring 9 and the connecting post 10 cooperate.

[0035] The outer wall of the input end of the throttle body 1 is provided with an external thread 12, and the inner wall of the guide protective sleeve 6 near the port of the throttle body 1 is provided with an internal thread 11. The external thread 12 and the internal thread 11 are engaged.

[0036] The inner wall of the guide sleeve 6 is provided with bristles 14 near the internal thread 11.

[0037] like Figure 3 As shown, the sand-proof sleeve 5 has several equally spaced sand-proof holes 13, and the guide protective sleeve 6 has several elongated through holes 15 on its side wall.

[0038] The throttling method of the downhole adjustable sand control and throttling device includes the following operating steps:

[0039] Step 1: Rotate knob 76 to adjust the distance between adjusting cone 74 and adjusting ring 75;

[0040] Step 2: Use the retrieval tool to drop the throttle body 1 into the wellbore;

[0041] Step 3: The retrieval device is operated to drive the seat ring 2 and sealing ring 3 on the throttle body 1 to be opened, thereby limiting the throttle body 1 in the wellbore;

[0042] Step 4: The fluid in the wellbore enters the regulating component 7 through the sand control sleeve 5, completing sand control and flow regulation.

[0043] The seat ring 2 and sealing ring 3 serve to limit and seal the throttle body 1 in the wellbore, ensuring that fluid output in the wellbore can only be controlled through the throttle body 1. The rubber gasket 8 is located between the countersunk hole 4 and the sandproof sleeve 5, ensuring a tight connection between the sandproof sleeve 5 and the throttle body 1. The connecting ring 9 on the sandproof sleeve 5 cooperates with the connecting post on the guide protective sleeve 6, preventing strong shaking between the sandproof sleeve 5 and the guide protective sleeve 6. Furthermore, brush bristles 14 are provided on the inner wall of the guide protective sleeve 6 at the connection between the throttle body 1 and the guide protective sleeve 6. During the disassembly and installation of the guide protective sleeve 6 and the sandproof sleeve 5, the outer wall of the sandproof sleeve 5 can be cleaned by brushing, eliminating the need for separate cleaning and making the cleaning process more convenient. The cleaning process is already underway during disassembly, further reducing operating steps and improving operational efficiency.

[0044] When installing the sandproof sleeve 5, insert one end of the sandproof sleeve 5 into the countersunk hole 4 and press it against the outer wall of the rubber gasket 8. Then, put the guide protective sleeve 6 on the outer sleeve of the sandproof sleeve 5 so that the connecting post 10 is inserted into the inner wall of the connecting ring 9 and pressed against the outer wall of the sandproof sleeve 5. Then tighten the guide protective sleeve 6 to complete the connection between the guide protective sleeve 6 and the throttle body 1, and at the same time, press the sandproof sleeve 5 to complete the connection between the sandproof sleeve 5 and the throttle body 1. The outer wall of the knob 76 is formed with anti-slip texture 72 at equal angles. The anti-slip texture 72 increases the friction between the hand and the outer wall of the knob 76.

[0045] When using the adjustment component 7, rotating the knob 76 drives the screw 73 to rotate, which in turn causes the screw 73 to move up and down along the axis of the throttle body 1. This causes the adjustment cone 74 to move up and down, allowing the end of the adjustment cone 74 to penetrate into the inner side of the adjustment ring 75, thus adjusting the opening of the middle part of the adjustment ring 75. Adjusting the opening of the middle part of the adjustment ring 75 is equivalent to adjusting the opening of the throttle body 1, thereby making the flow rate of the throttle body 1 adjustable.

[0046] The size of the sand-proof hole 13 and the through hole 15 can be controlled by rotating the sand-proof sleeve 5 and the guide protective sleeve 6. When the sand-proof function is not required, the sand-proof sleeve 5 and the guide protective sleeve 6 can be rotated so that the side wall of the guide protective sleeve 6 completely covers the sand-proof hole 13. When sand protection is required for large particles, the sand-proof sleeve 5 and the guide protective sleeve 6 can be rotated so that the hole of the sand-proof hole 13 is completely exposed.

[0047] Example 1

[0048] The downhole adjustable sand control and throttling device of the present invention includes a throttling device body 1. A seat seal ring 2 and a sealing ring 3 are sequentially fitted on the side wall of the throttling device body 1 near the input end. A countersunk hole 4 is opened at the input end of the throttling device body 1. One end of a sand control sleeve 5 is fitted inside the countersunk hole 4. A guide protective sleeve 6 is fitted on the outer wall of the sand control sleeve 5. The guide protective sleeve 6 is threadedly connected to the throttling device body 1. The guide protective sleeve 6 is snapped into the other end of the sand control sleeve 5. An adjustment component 7 is installed on the inner wall of the throttling device body 1.

[0049] The adjusting assembly 7 includes a screw 73. One end of the screw 73 passes through the mounting base 71 and is connected to an adjusting cone 74. The other end of the screw 73 is connected to a knob 76. The knob 76 is located near the guide protective sleeve 6. The adjusting cone 74 is fitted with an adjusting ring 75. The outer wall of the adjusting ring 75 is connected to the inner wall of the throttle body 1. The mounting base 71 is connected to the inner wall of the throttle body 1.

[0050] The throttling method of the downhole adjustable sand control and throttling device includes the following operating steps:

[0051] Step 1: Rotate knob 76 to adjust the distance between adjusting cone 74 and adjusting ring 75;

[0052] Step 2: Use the retrieval tool to drop the throttle body 1 into the wellbore;

[0053] Step 3: The retrieval device is operated to drive the seat ring 2 and sealing ring 3 on the throttle body 1 to be opened, thereby limiting the throttle body 1 in the wellbore;

[0054] Step 4: The fluid in the wellbore enters the regulating component 7 through the sand control sleeve 5, completing sand control and flow regulation.

[0055] Example 2

[0056] The downhole adjustable sand control and throttling device of the present invention includes a throttling device body 1. A seat seal ring 2 and a sealing ring 3 are sequentially fitted on the side wall of the throttling device body 1 near the input end. A countersunk hole 4 is opened at the input end of the throttling device body 1. One end of a sand control sleeve 5 is fitted inside the countersunk hole 4. A guide protective sleeve 6 is fitted on the outer wall of the sand control sleeve 5. The guide protective sleeve 6 is threadedly connected to the throttling device body 1. The guide protective sleeve 6 is snapped into the other end of the sand control sleeve 5. An adjustment component 7 is installed on the inner wall of the throttling device body 1.

[0057] The adjusting assembly 7 includes a screw 73. One end of the screw 73 passes through the mounting base 71 and is connected to an adjusting cone 74. The other end of the screw 73 is connected to a knob 76. The knob 76 is located near the guide protective sleeve 6. The adjusting cone 74 is fitted with an adjusting ring 75. The outer wall of the adjusting ring 75 is connected to the inner wall of the throttle body 1. The mounting base 71 is connected to the inner wall of the throttle body 1.

[0058] The outer wall of the knob 76 is provided with anti-slip textures 72 at equal intervals.

[0059] The bottom diameter of the adjusting cone 74 is larger than the top diameter of the adjusting cone 74. The bottom of the adjusting cone 74 is perpendicularly connected to the screw 73. The inner diameter of the adjusting ring 75 is not larger than the bottom diameter of the adjusting cone 74.

[0060] The throttling method of the downhole adjustable sand control and throttling device includes the following operating steps:

[0061] Step 1: Rotate knob 76 to adjust the distance between adjusting cone 74 and adjusting ring 75;

[0062] Step 2: Use the retrieval tool to drop the throttle body 1 into the wellbore;

[0063] Step 3: The retrieval device is operated to drive the seat ring 2 and sealing ring 3 on the throttle body 1 to be opened, thereby limiting the throttle body 1 in the wellbore;

[0064] Step 4: The fluid in the wellbore enters the regulating component 7 through the sand control sleeve 5, completing sand control and flow regulation.

[0065] Example 3

[0066] The downhole adjustable sand control and throttling device of the present invention includes a throttling device body 1. A seat seal ring 2 and a sealing ring 3 are sequentially fitted on the side wall of the throttling device body 1 near the input end. A countersunk hole 4 is opened at the input end of the throttling device body 1. One end of a sand control sleeve 5 is fitted inside the countersunk hole 4. A guide protective sleeve 6 is fitted on the outer wall of the sand control sleeve 5. The guide protective sleeve 6 is threadedly connected to the throttling device body 1. The guide protective sleeve 6 is snapped into the other end of the sand control sleeve 5. An adjustment component 7 is installed on the inner wall of the throttling device body 1.

[0067] The adjusting assembly 7 includes a screw 73. One end of the screw 73 passes through the mounting base 71 and is connected to an adjusting cone 74. The other end of the screw 73 is connected to a knob 76. The knob 76 is located near the guide protective sleeve 6. The adjusting cone 74 is fitted with an adjusting ring 75. The outer wall of the adjusting ring 75 is connected to the inner wall of the throttle body 1. The mounting base 71 is connected to the inner wall of the throttle body 1.

[0068] A rubber gasket 8 is provided between the countersunk hole 4 and the sandproof sleeve 5.

[0069] A connecting ring 9 is connected to the center of the port of the sandproof sleeve 5 away from the throttle body 1. The connecting ring 9 is located between the sandproof sleeve 5 and the guide protective sleeve 6. The axis of the connecting ring 9 coincides with the axis of the sandproof sleeve 5. A connecting post 10 is provided at the position opposite to the connecting ring 9 of the guide protective sleeve 6. The connecting ring 9 and the connecting post 10 cooperate.

[0070] The outer wall of the input end of the throttle body 1 is provided with an external thread 12, and the inner wall of the guide protective sleeve 6 near the port of the throttle body 1 is provided with an internal thread 11. The external thread 12 and the internal thread 11 are engaged.

[0071] The inner wall of the guide sleeve 6 is provided with bristles 14 near the internal thread 11.

[0072] The sand-proof sleeve 5 has several equally spaced sand-proof holes 13, and the guide protective sleeve 6 has several elongated through holes 15 on its side wall.

[0073] The throttling method of the downhole adjustable sand control and throttling device includes the following operating steps:

[0074] Step 1: Rotate knob 76 to adjust the distance between adjusting cone 74 and adjusting ring 75;

[0075] Step 2: Use the retrieval tool to drop the throttle body 1 into the wellbore;

[0076] Step 3: The retrieval device is operated to drive the seat ring 2 and sealing ring 3 on the throttle body 1 to be opened, thereby limiting the throttle body 1 in the wellbore;

[0077] Step 4: The fluid in the wellbore enters the regulating component 7 through the sand control sleeve 5, completing sand control and flow regulation.

[0078] Example 4

[0079] The downhole adjustable sand control and throttling device of the present invention includes a throttling device body 1. A seat seal ring 2 and a sealing ring 3 are sequentially fitted on the side wall of the throttling device body 1 near the input end. A countersunk hole 4 is opened at the input end of the throttling device body 1. One end of a sand control sleeve 5 is fitted inside the countersunk hole 4. A guide protective sleeve 6 is fitted on the outer wall of the sand control sleeve 5. The guide protective sleeve 6 is threadedly connected to the throttling device body 1. The guide protective sleeve 6 is snapped into the other end of the sand control sleeve 5. An adjustment component 7 is installed on the inner wall of the throttling device body 1.

[0080] The adjusting assembly 7 includes a screw 73. One end of the screw 73 passes through the mounting base 71 and is connected to an adjusting cone 74. The other end of the screw 73 is connected to a knob 76. The knob 76 is located near the guide protective sleeve 6. The adjusting cone 74 is fitted with an adjusting ring 75. The outer wall of the adjusting ring 75 is connected to the inner wall of the throttle body 1. The mounting base 71 is connected to the inner wall of the throttle body 1.

[0081] The outer wall of the knob 76 is provided with anti-slip textures 72 at equal intervals.

[0082] The bottom diameter of the adjusting cone 74 is larger than the top diameter of the adjusting cone 74. The bottom of the adjusting cone 74 is perpendicularly connected to the screw 73. The inner diameter of the adjusting ring 75 is not larger than the bottom diameter of the adjusting cone 74.

[0083] A rubber gasket 8 is provided between the countersunk hole 4 and the sandproof sleeve 5.

[0084] A connecting ring 9 is connected to the center of the port of the sandproof sleeve 5 away from the throttle body 1. The connecting ring 9 is located between the sandproof sleeve 5 and the guide protective sleeve 6. The axis of the connecting ring 9 coincides with the axis of the sandproof sleeve 5. A connecting post 10 is provided at the position opposite to the connecting ring 9 of the guide protective sleeve 6. The connecting ring 9 and the connecting post 10 cooperate.

[0085] The outer wall of the input end of the throttle body 1 is provided with an external thread 12, and the inner wall of the guide protective sleeve 6 near the port of the throttle body 1 is provided with an internal thread 11. The external thread 12 and the internal thread 11 are engaged.

[0086] The inner wall of the guide sleeve 6 is provided with bristles 14 near the internal thread 11.

[0087] The sand-proof sleeve 5 has several equally spaced sand-proof holes 13, and the guide protective sleeve 6 has several elongated through holes 15 on its side wall.

[0088] The throttling method of the downhole adjustable sand control and throttling device includes the following operating steps:

[0089] Step 1: Rotate knob 76 to adjust the distance between adjusting cone 74 and adjusting ring 75;

[0090] Step 2: Use the retrieval tool to drop the throttle body 1 into the wellbore;

[0091] Step 3: The retrieval device is operated to drive the seat ring 2 and sealing ring 3 on the throttle body 1 to be opened, thereby limiting the throttle body 1 in the wellbore;

[0092] Step 4: The fluid in the wellbore enters the regulating component 7 through the sand control sleeve 5, completing sand control and flow regulation.

Claims

1. An adjustable sand control and throttling device for downhole applications, characterized in that, The device includes a throttle body (1), on which a sealing ring (2) and a sealing ring (3) are sequentially fitted on the side wall near the input end. A countersunk hole (4) is provided at the input end of the throttle body (1), and one end of a sand-proof sleeve (5) is fitted inside the countersunk hole (4). A guide protective sleeve (6) is fitted on the outer wall of the sand-proof sleeve (5). The guide protective sleeve (6) is threadedly connected to the throttle body (1), and the other end of the guide protective sleeve (6) is snapped into place with the sand-proof sleeve (5). An adjustment component (7) is installed on the inner wall of the throttle body (1).

2. The downhole adjustable sand control and throttling device according to claim 1, characterized in that, The adjustment assembly (7) includes a screw (73), one end of which passes through the mounting base (71) and is connected to an adjustment cone (74). The other end of the screw (73) is connected to a knob (76), which is located near the guide protective sleeve (6). The adjustment cone (74) is fitted with an adjustment ring (75), the outer wall of which is connected to the inner wall of the throttle body (1). The mounting base (71) is connected to the inner wall of the throttle body (1).

3. The downhole adjustable sand control and throttling device according to claim 2, characterized in that, The outer wall of the knob (76) is provided with anti-slip textures (72) at equal intervals.

4. The downhole adjustable sand control and throttling device according to claim 3, characterized in that, The bottom diameter of the adjusting cone (74) is greater than the top diameter of the adjusting cone (74), the bottom of the adjusting cone (74) is perpendicularly connected to the screw (73), and the inner diameter of the adjusting ring (75) is not greater than the bottom diameter of the adjusting cone (74).

5. The downhole adjustable sand control and throttling device according to claim 4, characterized in that, A rubber gasket (8) is provided between the countersunk hole (4) and the sandproof sleeve (5).

6. The downhole adjustable sand control and throttling device according to claim 5, characterized in that, A connecting ring (9) is connected to the center of the port away from the throttle body (1) of the sandproof sleeve (5). The connecting ring (9) is located between the sandproof sleeve (5) and the guide protective sleeve (6). The axis of the connecting ring (9) coincides with the axis of the sandproof sleeve (5). A connecting post (10) is provided at the position opposite to the connecting ring (9) of the guide protective sleeve (6). The connecting ring (9) and the connecting post (10) cooperate.

7. The downhole adjustable sand control and throttling device according to claim 6, characterized in that, The outer wall of the input end of the throttle body (1) is provided with an external thread (12), and the inner wall of the guide protective sleeve (6) near the port of the throttle body (1) is provided with an internal thread (11). The external thread (12) and the internal thread (11) are engaged.

8. The downhole adjustable sand control and throttling device according to claim 7, characterized in that, The inner wall of the guide sleeve (6) near the internal thread (11) is provided with bristles (14).

9. The downhole adjustable sand control and throttling device according to claim 8, characterized in that, The sandproof sleeve (5) has several equally spaced sandproof holes (13), and the guide protective sleeve (6) has several elongated through holes (15) on its side wall.

10. A throttling method using a downhole adjustable sand control and throttling device, comprising the downhole adjustable sand control and throttling device as described in claim 9, characterized in that... The following steps are included: Step 1: Rotate the knob (76) to adjust the distance between the adjusting cone (74) and the adjusting ring (75); Step 2: Use the retrieval tool to drop the throttle body (1) into the wellbore; Step 3: The seat ring (2) and sealing ring (3) on the throttle body (1) of the throttle are opened by operating the retrieval device to limit the throttle body (1) in the wellbore; Step 4: The fluid in the wellbore enters the regulating component (7) through the sand control sleeve (5) to complete sand control and flow regulation.

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