A combined multi-purpose wellhead gate valve for oil production

Abstract

The present invention discloses a combined multi-purpose wellhead gate valve for oil extraction, wherein a side sealing plate away from a side arc piece is fixedly connected to a side of a valve stem, an inner wall of a rectangular side groove is fixedly connected to one end of an outwardly extending spring, an inner wall of the rectangular side groove is slidably connected to a side of a long angle plate, an inner wall of the rectangular side groove is fixedly connected to one end of a side connecting rod, one side of a wave-shaped connecting piece is fixedly connected to one side of the long angle plate, a plurality of side grooves are provided and are evenly distributed on one side of the long angle plate, a plurality of side arc pieces are provided and are evenly distributed on one side of the side sealing plate, the present invention relates to the technical field of wellhead gate valves, in this combined multi-purpose wellhead gate valve for oil extraction, a rounded corner setting on one side of the long angle plate facilitates sliding when encountering resistance, and prevents the long angle plate from being difficult to slide into the rectangular side groove due to uneven resistance force, and when the side connecting rod slides to one side of the inner wall of the side groove, resistance and limitation are performed on the long angle plate, and prevents the long angle plate from being disengaged from the rectangular side groove and being displaced when moving outward.

Description

Technical Field

[0001] The invention relates to the technical field of wellhead gate valves, and in particular to a combined multi-purpose wellhead gate valve for oil exploitation. Background Art

[0002] Oil extraction refers to the act of digging and extracting oil from a place where oil is stored. In the process of oil extraction, oil and gas flow from the reservoir to the bottom of the well and then rise from the bottom of the well to the wellhead. In the traditional oil extraction process, the wellhead needs a Christmas tree to complete the oil extraction work. The Christmas tree is a component located at the opening leading to the top of the oil well, including valves for measurement and maintenance, safety systems and a series of monitoring equipment. The Christmas tree connects the production pipeline and oil flow pipe from the well, and serves as an important barrier to isolate the top of the oil well from the external environment. It includes many valves that can be used to regulate or prevent the produced crude oil vapor, natural gas and liquid from gushing out of the well. Among them, the wellhead gate valve is often used by the Christmas tree as a commonly used pressure valve;

[0003] When oil is being exploited, the oil flows into the oil pipe through the gate valve, and the oil often brings a lot of debris such as stones and mud into the gate valve and the oil pipe. Most of the existing oil pipes are directly welded to the valve body and have a single extraction and transportation port. If the oil pipe is blocked, it is difficult to repair it in a short time, which seriously affects the subsequent oil extraction efficiency. Therefore, we propose a combined multi-purpose wellhead gate valve for oil extraction. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a combined multi-purpose wellhead gate valve for oil production, comprising:

[0005] A square valve body, which is used to dock with four oil pipes at the same time to prevent the transportation path of oil extraction from being too single, making it difficult to continue to transport oil in the event of a failure, and a valve stem arranged inside the square valve body;

[0006] Internally threaded oil pipe, which is used for threaded installation and removal with oil pipes for transporting oil through threaded matching, to prevent the oil pipes from being difficult to replace or repair when damaged or blocked, and an annular threaded pipe arranged on the inner wall of the internally threaded oil pipe;

[0007] Side sealing device, which is used to simultaneously seal the oil pipes in the same direction to prevent the produced oil from leaking to the adjacent oil pipes;

[0008] The sand discharge device, when the threads of the internal threaded oil pipe and the annular threaded pipe are matched, discharges the sand and gravel accumulated in the oil pipe through the annular push plate during disassembly, thus preventing a large amount of sand and gravel and mud in the oil from accumulating in the oil pipe for a long time;

[0009] The sand catching device is used to resist the sand and gravel in the oil and push it to the pipe mouth to prevent a large amount of sand and gravel and mud in the oil from spreading all over the inner wall of the oil pipe with the flow of oil;

[0010] One end of the valve stem passes through the top of the square valve body and is rotatably connected to the square valve body, both sides of the valve stem are fixedly connected to one side of the side sealing device, the four sides of the square valve body are connected to one end of the internal threaded oil pipe, the inner wall of the internal threaded oil pipe is threadedly connected to the outer surface of the annular threaded pipe, the inner wall of the annular threaded pipe is fixedly connected to the outer surface of the sand discharge device, and the inner wall of the annular threaded pipe is fixedly connected to the outer surface of the sand catching device;

[0011] Wherein, the side sealing device comprises:

[0012] A long angle plate, which is used to always fit with the inner wall of the square valve body for blocking, and the long angle plate is arranged with a rounded corner on one side to facilitate sliding when encountering resistance, so as to prevent the long angle plate from being difficult to slide into the rectangular side groove due to uneven resistance force, and an outward extension spring arranged on one side of the long angle plate;

[0013] One side of the long angle plate is fixedly connected to one end of an outward extension spring, and a plurality of outward extension springs are provided and evenly distributed on one side of the long angle plate;

[0014] One side of the long angle plate is slidably connected to a side sealing plate, and both sides of the side sealing plate are provided with rectangular side grooves, and the inner wall of the rectangular side groove is fixedly connected with a corrugated connecting piece, and the corrugated connecting piece connected to the inner wall of the rectangular side groove and the long angle plate at the same time covers and blocks the rectangular side groove, so as to prevent a large amount of oil from seeping into the rectangular side groove and affecting the use of parts. A side groove is provided on the side of the long angle plate close to the outwardly extending spring, and a side connecting rod is slidably connected to the inner wall of the side groove, and when the side connecting rod slides to one side of the inner wall of the side groove, it resists and limits the long angle plate, so as to prevent the long angle plate from disengaging from the rectangular side groove and being displaced when moving outward, and a side arc piece is fixedly connected to one side of the side sealing plate, and sand and mud are scraped into the internal threaded oil pipe by the side arc piece, so as to prevent a large amount of sand and mud from being deposited at the bottom of the wall of the square valve body and affecting the rotation of the side sealing plate;

[0015] The side of the side sealing plate away from the side arc piece is fixedly connected to one side of the valve stem, the inner wall of the rectangular side groove is fixedly connected to one end of the extended spring, the inner wall of the rectangular side groove is slidingly connected to one side of the long angle plate, the inner wall of the rectangular side groove is fixedly connected to one end of the side connecting rod, one side of the corrugated connecting piece is fixedly connected to one side of the long angle plate, a plurality of side grooves are provided and are evenly distributed on one side of the long angle plate, and a plurality of side arc pieces are provided and are evenly distributed on one side of the side sealing plate.

[0016] Furthermore, the sand removal device includes an inner long plate, one side of the inner long plate is fixedly connected to a side cylinder, the outer surface of the side cylinder is sleeved and fixedly connected to an arc-shaped scraper, and the arc-shaped scraper slides and scrapes the inner wall of the internal threaded oil pipe when moving, so as to prevent a large amount of mud, sand and other debris from adhering to the internal threaded oil pipe and being difficult to handle, and the outer surface of the arc-shaped scraper is fixedly connected to an external brush, and the external brush frictionally cleans the thread groove of the inner wall of the internal threaded oil pipe, so as to prevent mud, sand and other debris from accumulating in the thread groove of the inner wall of the internal threaded oil pipe and affecting the subsequent thread installation, and the outer surface of the arc-shaped scraper is provided with an inclined arc hole, and the inclined arc hole covering the outer surface of the arc-shaped scraper with a large area facilitates the passage of oil. , to prevent the arc-shaped scraper from resisting the oil and affecting the flow rate of the oil, causing a large amount of mud and sand to adhere to the surface. Both sides of the side cylinder are fixedly connected with side connecting plates, and one side of the side connecting plate is fixedly connected with an annular push plate. When the annular push plate moves, the sand, mud and other debris accumulated in the internal threaded oil pipe are brought out to prevent excessive sand, mud and sand from accumulating in the internal threaded oil pipe for a long time and causing blockage. Both sides of the inner long plate are fixedly connected to the inner wall of the annular threaded pipe, and the outer surface of the arc-shaped scraper is slidably connected to the inner wall of the internal threaded oil pipe. The outer brushes are provided with a plurality of and are evenly distributed on the outer surface of the arc-shaped scraper, and the inclined arc holes are provided with a plurality of and are evenly distributed on the outer surface of the arc-shaped scraper.

[0017] Furthermore, the sand catching device includes a circular baffle, one side of which is provided with a sand catching hole, and debris such as sand and mud in the oil are blocked by the sand catching hole, so as to prevent a large amount of sand and mud from spreading all over the inner wall of the oil pipe with the flow of oil, and one side of the circular baffle is fixedly connected with a conical circular plate, which guides the path of the cleaning mechanism to prevent the cleaning mechanism from being difficult to move toward the inner wall of the annular threaded pipe due to its own shape setting, and the outer surface of the conical circular plate is fixedly connected with the cleaning mechanism, and the outer surface of the conical circular plate is provided with an oil-passing circular hole, and the oil-passing circular hole provided on the outer surface of the conical circular plate facilitates the passage of oil and mud, so as to prevent a large amount of sand and mud from passing through. Sand adheres to the surface of the conical circular plate and accumulates in the conical groove. An arc-shaped inclined hole is provided on the outer surface of the conical circular plate. The arc-shaped inclined hole provided on the conical circular plate facilitates the discharge of sand and mud and sand, and prevents sand and mud near the inner wall of the annular threaded pipe from being deposited between the circular baffle and the conical circular plate. The outer surface of the circular baffle is fixedly connected to the inner wall of the annular threaded pipe, and the outer surface of the conical circular plate is fixedly connected to the inner wall of the annular threaded pipe. There are multiple sand catching holes and they are evenly distributed on the outer surface of the circular baffle, there are multiple oil-passing circular holes and they are evenly distributed on the outer surface of the conical circular plate, and there are multiple arc-shaped inclined holes and they are evenly distributed on the outer surface of the conical circular plate.

[0018] Furthermore, the cleaning mechanism includes a corrugated expansion ring, which slides and scrapes one side of the circular baffle when it is extended to prevent the circular baffle from being used for a long time and causing a large amount of mud and sand to adhere to the surface and be difficult to clean. The outer surface of the corrugated expansion ring is fixedly connected with a small thorn block, which intermittently penetrates into the sand catching hole when it moves to prevent the sand catching hole from being blocked by too much sand or mud, which makes it difficult for oil to flow. The outer surface of the corrugated expansion ring is fixedly connected with an annular arc sheet, which scrapes the sand and mud attached to the inner wall of the annular threaded pipe to prevent a large amount of sand and mud from adhering. It is difficult to discharge oil through the arc-shaped inclined hole on the inner wall of the annular threaded pipe. A concave arc hole is provided on the outer surface of the corrugated expansion ring. The concave arc hole provided on the surface of the corrugated expansion ring facilitates the passage of oil and mud and sand, and prevents a large amount of sand and mud from being mixed in the corrugated gap and affecting the use of the corrugated expansion ring. One side of the corrugated expansion ring is fixedly connected to the outer surface of the conical circular plate. A plurality of small thorn blocks are provided and evenly distributed on the outer surface of the corrugated expansion ring. A plurality of annular arc sheets are provided and evenly distributed on the outer surface of the corrugated expansion ring. A plurality of concave arc holes are provided and evenly distributed on the outer surface of the corrugated expansion ring.

[0019] The present invention has the beneficial effects:

[0020] 1. The rounded corner of one side of the long angle plate of the present invention makes it easy to slide when encountering resistance, thereby preventing the long angle plate from being difficult to slide into the rectangular side groove due to uneven resistance force; when the annular push plate moves, the sand, mud and other debris accumulated in the internal threaded oil pipe are brought out, thereby preventing excessive sand, mud and sand from accumulating in the internal threaded oil pipe for a long time and causing blockage; the sand, mud and other debris in the oil are blocked by the sand arresting holes, thereby preventing a large amount of sand, mud and sand from spreading all over the inner wall of the oil pipe with the flow of oil; the corrugated expansion ring slides and scrapes one side of the circular baffle when stretching, thereby preventing the circular baffle from being attached to the surface with a large amount of mud and sand that is difficult to clean due to long-term use.

[0021] 2. The present invention sets a side sealing device. The rounded corner of one side of the long angle plate facilitates sliding when encountering resistance, thereby preventing the long angle plate from being difficult to slide into the rectangular side groove due to uneven resistance force. When the side connecting rod slides to one side of the inner wall of the side groove, it interferes and limits the long angle plate to prevent the long angle plate from being disengaged from the rectangular side groove and shifting and misaligned when moving outward. The corrugated connecting piece connected to the inner wall of the rectangular side groove and the long angle plate covers and seals the rectangular side groove, thereby preventing a large amount of oil from seeping into the rectangular side groove and affecting the use of parts. Sand and mud are scraped into the internal threaded oil pipe by the side arc piece, thereby preventing a large amount of sand and mud from being deposited at the bottom of the inner wall of the square valve body and affecting the rotation of the side sealing plate.

[0022] 3. The present invention provides a sand removal device. When the arc scraper moves, it slides and scrapes the inner wall of the internal threaded oil pipe to prevent a large amount of mud, sand and other debris from adhering to the internal threaded oil pipe and being difficult to handle. The external brush frictionally cleans the thread groove on the inner wall of the internal threaded oil pipe to prevent mud, sand and other debris from accumulating in the thread groove on the inner wall of the internal threaded oil pipe and affecting the subsequent thread installation. At the same time, the inclined arc holes covering the outer surface of the arc scraper over a large area facilitate the passage of oil and prevent the arc scraper from resisting the oil and affecting the oil flow rate, causing a large amount of mud and sand to adhere to the surface. When the annular push plate moves, it takes out the sand, mud and other debris accumulated in the internal threaded oil pipe to prevent excessive sand, mud and sand from accumulating in the internal threaded oil pipe for a long time and causing blockage.

[0023] 4. The present invention provides a sand catching device. The oil-passing circular holes on the outer surface of the conical circular plate facilitate the passage of oil and mud and sand, and prevent a large amount of sand and mud and sand from adhering to the surface of the conical circular plate and accumulating in the conical groove. The sand and mud and other debris in the oil are blocked by the sand catching holes, and a large amount of sand and mud and sand are prevented from spreading all over the inner wall of the oil pipe with the flow of oil. The conical circular plate guides the path of the cleaning mechanism, and prevents the cleaning mechanism from being difficult to move toward the inner wall of the annular threaded pipe due to its own shape. At the same time, the arc-shaped inclined holes on the conical circular plate facilitate the discharge of sand and mud and sand, and prevent sand and mud and sand near the inner wall of the annular threaded pipe from being deposited between the circular baffle and the conical circular plate.

[0024] 5. The present invention provides a cleaning mechanism, and the annular arc sheet scrapes the sand and mud attached to the inner wall of the annular threaded tube to prevent a large amount of sand and mud from adhering to the inner wall of the annular threaded tube and being difficult to be discharged through the arc-shaped inclined hole. At the same time, the concave arc hole opened on the surface of the corrugated expansion ring facilitates the passage of oil and mud, and prevents a large amount of sand and mud from being mixed in the corrugated gap and affecting the use of the corrugated expansion ring. When the corrugated expansion ring is extended, it slides and scrapes one side of the circular baffle to prevent the circular baffle from being used for a long time and resulting in a large amount of mud and sand attached to the surface that is difficult to clean. When the small thorn block moves, it intermittently penetrates into the sand catching hole to prevent the sand catching hole from being mixed with too much sand or mud and causing blockage, making it difficult for oil to flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the combined multi-purpose wellhead gate valve of the present invention;

[0026] Figure 2 This is a schematic diagram of the internal structure of the combined multi-purpose wellhead gate valve of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the side sealing device of the present invention;

[0028] Figure 4 It is a schematic diagram of the internal structure of the side sealing device of the present invention;

[0029] Figure 5It is a structural schematic diagram of the sand discharge device of the present invention;

[0030] Figure 6 It is a schematic diagram of the side structure of the sand discharge device of the present invention;

[0031] Figure 7 It is a structural schematic diagram of the sand capturing device of the present invention;

[0032] Figure 8 It is a schematic diagram of the partial structure of the cleaning mechanism of the present invention;

[0033] Fig. 9 It is a schematic diagram of the cleaning mechanism structure of the present invention;

[0034] In the figure: 1, square valve body; 2, valve stem; 3, internal threaded oil pipe; 4, annular threaded pipe; 5, side sealing device; 6, sand discharge device; 7, sand capture device; 501, side sealing plate; 502, rectangular side groove; 503, extended spring; 504, long angle plate; 505, corrugated connecting piece; 506, side square groove; 507, side connecting rod; 508, side arc piece; 601, internal long plate; 602, side cylinder; 603, arc scraper; 604, outer brush; 605, inclined arc hole; 606, side connecting plate; 607, annular push plate; 701, circular baffle; 702, sand catching hole; 703, conical circular plate; 704, cleaning mechanism; 705, oil-passing circular hole; 706, arc inclined hole; 7041, wave-shaped expansion ring; 7042, small thorn block; 7043, annular arc piece; 7044, concave arc hole. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0036] For the first embodiment, please refer to Figure 1-Figure 6 The present invention is a combined multi-purpose wellhead gate valve for oil production, comprising:

[0037] A square valve body 1, which is used to dock with four oil pipes at the same time, and a valve stem 2 arranged inside the square valve body 1;

[0038] An internally threaded oil pipe 3, which is used for threaded installation and removal of an oil pipe for transporting oil through threaded matching, and an annular threaded pipe 4 arranged on the inner wall of the internally threaded oil pipe 3;

[0039] A side sealing device 5, which is used to simultaneously seal the oil pipes in the same direction;

[0040] A sand discharge device 6, which discharges sand and gravel accumulated in the oil pipe through an annular push plate 607 when the threads of the internal threaded oil pipe 3 and the annular threaded pipe 4 are matched during disassembly;

[0041] A sand catching device 7, which is used to resist sand and gravel in the oil and push it to the pipe mouth;

[0042] One end of the valve stem 2 passes through the top of the square valve body 1 and is rotatably connected to the square valve body 1. Both sides of the valve stem 2 are fixedly connected to one side of the side sealing device 5. The four sides of the square valve body 1 are connected to one end of the internal threaded oil pipe 3. The inner wall of the internal threaded oil pipe 3 is threadedly connected to the outer surface of the annular threaded pipe 4. The inner wall of the annular threaded pipe 4 is fixedly connected to the outer surface of the sand discharge device 6. The inner wall of the annular threaded pipe 4 is fixedly connected to the outer surface of the sand catching device 7.

[0043] Wherein, the side sealing device 5 comprises:

[0044] A long angle plate 504, which is used to always fit with the inner wall of the square valve body 1 for blocking, and an outwardly extending spring 503 arranged on one side of the long angle plate 504;

[0045] One side of the long angle plate 504 is fixedly connected to one end of the outward extension spring 503. A plurality of outward extension springs 503 are provided and evenly distributed on one side of the long angle plate 504.

[0046] A side sealing plate 501 is slidably connected to one side of the long angle plate 504, and rectangular side grooves 502 are provided on both sides of the side sealing plate 501. A corrugated connecting piece 505 is fixedly connected to the inner wall of the rectangular side groove 502. A side square groove 506 is provided on one side of the long angle plate 504 close to the extended spring 503, and a side connecting rod 507 is slidably connected to the inner wall of the side square groove 506. A side arc piece 508 is fixedly connected to one side of the side sealing plate 501.

[0047] The side of the side sealing plate 501 away from the side arc piece 508 is fixedly connected to one side of the valve stem 2, the inner wall of the rectangular side groove 502 is fixedly connected to one end of the extended spring 503, the inner wall of the rectangular side groove 502 is slidably connected to one side of the long angle plate 504, the inner wall of the rectangular side groove 502 is fixedly connected to one end of the side connecting rod 507, one side of the corrugated connecting piece 505 is fixedly connected to one side of the long angle plate 504, a plurality of side grooves 506 are provided and evenly distributed on one side of the long angle plate 504, and a plurality of side arc pieces 508 are provided and evenly distributed on one side of the side sealing plate 501;

[0048] The sand removal device 6 includes an inner long plate 601, one side of the inner long plate 601 is fixedly connected to a side cylinder 602, the outer surface of the side cylinder 602 is sleeved and fixedly connected to an arc scraper 603, the outer surface of the arc scraper 603 is fixedly connected to an outer brush 604, the outer surface of the arc scraper 603 is provided with an inclined arc hole 605, both sides of the side cylinder 602 are fixedly connected to side connecting plates 606, one side of the side connecting plate 606 is fixedly connected to an annular push plate 607, both sides of the inner long plate 601 are fixedly connected to the inner wall of the annular threaded pipe 4, the outer surface of the arc scraper 603 is slidably connected to the inner wall of the internal threaded oil pipe 3, a plurality of external brushes 604 are arranged and evenly distributed on the outer surface of the arc scraper 603, and a plurality of inclined arc holes 605 are arranged The plurality of valves are evenly distributed on the outer surface of the arc-shaped scraper 603. When in use, the annular threaded tube 4 is first manually threadedly installed with the thread groove on the inner wall of the internal threaded oil pipe 3 through thread matching. At this time, the valve stem 2 is rotated to drive the side sealing devices 5 on both sides to rotate. The side sealing devices 5 are rotated to be parallel to the direction of oil transportation in the oil pipe and then stopped. At this time, the oil pipe parallel to the side sealing device 5 opens the valve to transport oil, and the oil pipe on the adjacent side closes the valve to be blocked. The oil enters the internal threaded oil pipe 3 and the annular threaded tube 4 through the square valve body 1. When the oil in the annular threaded tube 4 passes through the sand catching device 7, the sand catching device 7 will resist the sand and mud in the oil. When the annular threaded tube 4 or the internal threaded oil pipe 3 is damaged or blocked, the rotating annular threaded tube 4 is screwed. The groove is removed from the internal threaded oil pipe 3 for replacement or maintenance. When the annular threaded pipe 4 rotates and moves, the sand and mud accumulated in the internal threaded oil pipe 3 will be brought out together. The rotating valve stem 2 drives the side sealing plates 501 on both sides to rotate together. When the side sealing plates 501 rotate, the long angle plates 504 on the inner wall of the rectangular side groove 502 are driven to rotate together. As the side sealing plates 501 rotate, the long angle plates 504 are resisted by the square valve body 1 to slide into the rectangular side groove 502 and compress the outwardly extending spring 503. The long angle plates 504 are set with rounded corners on one side to facilitate sliding when they are resisted. When the side sealing plate 501 rotates to be parallel to the oil pipe transportation direction of the valve opening, the outwardly extending spring 503 pushes the long angle plates 504 to move outward through the extension force and is always aligned with the square The inner wall of the valve body 1 fits together. At this time, the long angle plate 504 and the side sealing plate 501 that fit together with the inner wall of the square valve body 1 completely block the oil pipe close to the side arc piece 508. At the same time, the side connecting rod 507 connected to the side sealing plate 501 slides in the side groove 506. When the side connecting rod 507 slides to one side of the inner wall of the side groove 506, it contacts and limits the long angle plate 504. The corrugated connecting piece 505 that is connected to the inner wall of the rectangular side groove 502 and the long angle plate 504 covers and blocks the rectangular side groove 502. At the same time, when the side sealing plate 501 rotates, it drives the side arc piece 508 on one side to rotate together. When the side arc piece 508 rotates, it scrapes the sand and mud deposited on the bottom of the inner wall of the square valve body 1. The sand and mud are scraped into the internal threaded oil pipe 3 by the side arc piece 508.When the annular threaded tube 4 rotates through the threaded cooperation, it drives the inner long plate 601 of the inner wall to move together. The movement of the inner long plate 601 drives the side cylinder 602 on one side to move. When the side cylinder 602 moves, it drives the arc scraper 603 on the outer surface to move together. When the arc scraper 603 moves, it always contacts the inner wall of the internal threaded oil pipe 3. When the arc scraper 603 moves, it slides and scrapes the inner wall of the internal threaded oil pipe 3. The movement of the arc scraper 603 drives the outer brush 604 on the outer surface to move together. The outer brush 604 is made of hard brush material. The outer brush 604 cleans the thread groove on the inner wall of the internal threaded oil pipe 3 by friction. At the same time, the inclined arc hole 605 on the outer surface of the arc scraper 603 is covered with a large area to facilitate the passage of oil. When the side cylinder 602 moves, it drives the side connecting plates 606 on both sides to move together. When the side connecting plates 606 move, it drives the annular push plate 607 on one side to move together. When the annular push plate 607 moves, it takes out the sand, mud and other debris accumulated in the internal threaded oil pipe 3.

[0049] For the second embodiment, please refer to Figure 1-Figure 9 The present invention provides a combined multi-purpose wellhead gate valve for oil production: the sand catching device 7 includes a circular baffle 701, a sand catching hole 702 is provided on one side of the circular baffle 701, a conical circular plate 703 is fixedly connected to one side of the circular baffle 701, a cleaning mechanism 704 is fixedly connected to the outer surface of the conical circular plate 703, an oil-passing circular hole 705 is provided on the outer surface of the conical circular plate 703, an arc-shaped inclined hole 706 is provided on the outer surface of the conical circular plate 703, the outer surface of the circular baffle 701 is fixedly connected to the inner wall of the annular threaded tube 4, the outer surface of the conical circular plate 703 is fixedly connected to the inner wall of the annular threaded tube 4, a plurality of sand catching holes 702 are provided and evenly distributed on the outer surface of the circular baffle 701, a plurality of oil-passing circular holes 705 are provided and evenly distributed on the outer surface of the conical circular plate 703, and a plurality of arc-shaped inclined holes 706 are provided and evenly distributed on the outer surface of the conical circular plate 703;

[0050] The cleaning mechanism 704 includes a corrugated expansion ring 7041, a small thorn block 7042 is fixedly connected to the outer surface of the corrugated expansion ring 7041, an annular arc piece 7043 is fixedly connected to the outer surface of the corrugated expansion ring 7041, a concave arc hole 7044 is opened on the outer surface of the corrugated expansion ring 7041, one side of the corrugated expansion ring 7041 is fixedly connected to the outer surface of the conical circular plate 703, a plurality of small thorn blocks 7042 are arranged and evenly distributed on the outer surface of the corrugated expansion ring 7041, a plurality of annular arc pieces 7043 are arranged and evenly distributed on the outer surface of the corrugated expansion ring 7041, a plurality of concave arc holes 7044 are arranged and evenly distributed on the corrugated expansion ring 7041 outer surface, when in use, a large amount of oil flows into the annular threaded tube 4, the oil-passing circular hole 705 opened on the outer surface of the conical circular plate 703 facilitates the passage of oil and mud and sand, the oil and mud and sand passing through the conical circular plate 703 contact with the cleaning mechanism 704 and pass through the cleaning mechanism 704, the oil passing through the cleaning mechanism 704 smoothly flows out from the sand-catching hole 702 opened on the circular baffle 701, and the sand, mud and sand in the oil are blocked by the sand-catching hole 702, and at the same time, in another annular threaded tube 4 symmetrically arranged with this annular threaded tube 4, the oil passes through the sand-catching hole 702 of the circular baffle 701, and the sand, mud and sand are blocked in the circular baffle 70 1 is away from the side of the conical circular plate 703, and the flowing oil pushes the cleaning mechanism 704 to slide along the conical surface of the conical circular plate 703, and the conical circular plate 703 guides the cleaning mechanism 704. At the same time, the arc-shaped inclined hole 706 opened on the conical circular plate 703 is convenient for the discharge of sand and mud. The flowing oil pushes the corrugated expansion ring 7041 to shrink along the conical surface of the conical circular plate 703. When the corrugated expansion ring 7041 shrinks, it drives the annular arc piece 7043 on the surface to move together. When the annular arc piece 7043 moves, it gradually contacts the inner wall of the annular threaded pipe 4 and scrapes the sand and mud to move toward the arc-shaped inclined hole 706. The blade 7043 scrapes the sand and mud attached to the inner wall of the annular threaded pipe 4. At the same time, the concave arc hole 7044 opened on the surface of the corrugated expansion ring 7041 facilitates the passage of oil and mud. When the side sealing device 5 seals the internal threaded oil pipe 3, the corrugated expansion ring 7041 loses the thrust of the oil and stretches inward. The corrugated expansion ring 7041 is in contact with the surface of the circular baffle 701 at all times when stretching. The corrugated expansion ring 7041 slides and scrapes one side of the circular baffle 701 when stretching. At the same time, when the corrugated expansion ring 7041 stretches, it drives the small thorn block 7042 on the outer surface to move together. When the small thorn block 7042 moves, it intermittently pierces the sand catching hole 702.

[0051] When the present invention is operated and used, the annular threaded tube 4 is first manually threadedly installed with the thread groove on the inner wall of the internal threaded oil pipe 3 through threaded cooperation. At this time, the valve stem 2 is rotated to drive the side sealing devices 5 on both sides to rotate. The side sealing devices 5 are rotated to be parallel to the direction of oil transportation in the oil pipe and then stopped. At this time, the oil pipe parallel to the side sealing device 5 opens the valve to transport oil, and the oil pipe on the adjacent side closes the valve to be blocked. The oil enters the internal threaded oil pipe 3 and the annular threaded tube 4 through the square valve body 1. When the oil in the annular threaded tube 4 passes through the sand catching device 7, the sand catching device 7 will resist the sand and mud in the oil. When the annular threaded tube 4 or the internal threaded oil pipe 3 is damaged or blocked, the rotating annular threaded tube 4 is removed from the internal threaded oil pipe 3 through threaded cooperation. When the annular threaded tube 4 rotates, the sand and mud accumulated in the internal threaded oil pipe 3 will be brought out, and the valve stem 2 will be rotated to drive the side sealing plates 501 on both sides to rotate together. When the side sealing plates 501 rotate, the long angle plates 504 on the inner wall of the rectangular side groove 502 will be rotated together. As the side sealing plates 501 rotate, the long angle plates 504 are resisted by the square valve body 1 to slide into the rectangular side groove 502 and compress the outward spring 503. The long angle plates 504 are arranged with rounded corners on one side to facilitate sliding when they are resisted. When the side sealing plates 501 rotate to be parallel to the oil pipe transportation direction of the valve opening, the outward spring 503 pushes the long angle plates 504 to move outward through the extension force and fits the inner wall of the square valve body 1 at all times. The long angle plate 504 and the side sealing plate 501 which are fitted to the inner wall of the square valve body 1 completely block the oil pipe close to the side arc piece 508. At the same time, the side connecting rod 507 connected to the side sealing plate 501 slides in the side groove 506. When the side connecting rod 507 slides to the side wall of the side groove 506, it contacts and limits the long angle plate 504. The wave-shaped connecting piece 505 which is connected to the inner wall of the rectangular side groove 502 and the long angle plate 504 covers and blocks the rectangular side groove 502. At the same time, when the side sealing plate 501 rotates, it drives the side arc piece 508 on one side to rotate together. When the side arc piece 508 rotates, it scrapes the sand and mud deposited on the bottom of the inner wall of the square valve body 1. The sand and mud are scraped into the internal threaded oil pipe 3 by the side arc piece 508, and the annular threaded pipe 4 moves by rotating through the thread matching. When the inner long plate 601 of the inner wall is moved together, the movement of the inner long plate 601 drives the side cylinder 602 on one side to move, and when the side cylinder 602 moves, it drives the arc scraper 603 on the outer surface to move together, and the arc scraper 603 is in contact with the inner wall of the internal threaded oil pipe 3 at all times when moving, and the arc scraper 603 slides and scrapes the inner wall of the internal threaded oil pipe 3 when moving, and the movement of the arc scraper 603 drives the outer brush 604 on the outer surface to move together, and the outer brush 604 is made of hard brush material, and the outer brush 604 frictionally cleans the thread groove on the inner wall of the internal threaded oil pipe 3, and at the same time, the inclined arc hole 605 covering a large area on the outer surface of the arc scraper 603 is convenient for the passage of oil, and when the side cylinder 602 moves, it drives the side connecting plates 606 on both sides to move together,When the side connecting plate 606 moves, the annular push plate 607 on one side moves together. When the annular push plate 607 moves, the sand, mud and other debris accumulated in the internal threaded oil pipe 3 are taken out together, and a large amount of oil flows into the annular threaded pipe 4. The oil-passing circular hole 705 opened on the outer surface of the conical circular plate 703 facilitates the passage of oil and mud. The oil and mud passing through the conical circular plate 703 contact with the cleaning mechanism 704 and pass through the cleaning mechanism 704. The oil passing through the cleaning mechanism 704 smoothly flows out of the sand-catching hole 705 opened on the circular baffle 701. 2, while the sand and mud in the oil are blocked by the sand trap hole 702. At the same time, in another annular threaded tube 4 symmetrically arranged with the annular threaded tube 4, the oil passes through the sand trap hole 702 of the circular baffle 701, and the sand and mud are blocked on the side of the circular baffle 701 away from the conical circular plate 703. The flowing oil pushes the cleaning mechanism 704 to slide along the conical surface of the conical circular plate 703, and the conical circular plate 703 guides the cleaning mechanism 704. At the same time, the arc opening on the conical circular plate 703 The shaped inclined hole 706 facilitates the discharge of sand and mud. The flowing oil pushes the corrugated expansion ring 7041 to contract along the conical surface of the conical circular plate 703. When the corrugated expansion ring 7041 contracts, it drives the annular arc piece 7043 on the surface to move together. When the annular arc piece 7043 moves, it gradually contacts the inner wall of the annular threaded pipe 4 and scrapes the sand and mud to move toward the arc-shaped inclined hole 706. The annular arc piece 7043 scrapes the sand and mud attached to the inner wall of the annular threaded pipe 4. At the same time, the concave grooves on the surface of the corrugated expansion ring 7041 The arc hole 7044 facilitates the passage of oil and mud and sand. When the side sealing device 5 seals the internal threaded oil pipe 3, the corrugated expansion ring 7041 loses the oil thrust and stretches inward. The corrugated expansion ring 7041 is in contact with the surface of the circular baffle 701 at all times when stretching. The corrugated expansion ring 7041 slides and scrapes one side of the circular baffle 701 when stretching. At the same time, the corrugated expansion ring 7041 drives the small thorn block 7042 on the outer surface to move together when stretching. The small thorn block 7042 intermittently pierces the sand catching hole 702 when moving.

[0052] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A combined multi-purpose wellhead gate valve for oil production, characterized in that: include: A square valve body (1), the square valve body (1) being used to be connected to four oil pipes at the same time, and a valve stem (2) arranged inside the square valve body (1); An internally threaded oil pipe (3) used for threaded installation and removal of an oil pipe for transporting petroleum through threaded matching, and an annular threaded pipe (4) arranged on the inner wall of the internally threaded oil pipe (3); A side sealing device (5), the side sealing device (5) being used to simultaneously seal oil pipes at the same horizontal position; A sand discharge device (6), wherein the sand discharge device (6) discharges sand and gravel accumulated in the oil pipe through an annular push plate (607) when the threads of the internally threaded oil pipe (3) and the annularly threaded pipe (4) are matched during disassembly; A sand catching device (7), the sand catching device (7) is used to resist sand and gravel in the petroleum and push it toward the pipe mouth; One end of the valve stem (2) passes through the top of the square valve body (1) and is rotatably connected to the square valve body (1); both sides of the valve stem (2) are fixedly connected to one side of the side sealing device (5); the four sides of the square valve body (1) are connected to one end of the internal threaded oil pipe (3); the inner wall of the internal threaded oil pipe (3) is threadedly connected to the outer surface of the annular threaded pipe (4); the inner wall of the annular threaded pipe (4) is fixedly connected to the outer surface of the sand discharge device (6); and the inner wall of the annular threaded pipe (4) is fixedly connected to the outer surface of the sand capture device (7); Wherein, the side sealing device (5) comprises: A long angle plate (504), the long angle plate (504) being used to always fit in contact with the inner wall of the square valve body (1) for sealing, and an outwardly extending spring (503) arranged on one side of the long angle plate (504); One side of the long angle plate (504) is fixedly connected to one end of an outwardly extending spring (503); a plurality of outwardly extending springs (503) are provided and are evenly distributed on one side of the long angle plate (504).

2. A combined multi-purpose wellhead gate valve for oil production according to claim 1, characterized in that: One side of the long angle plate (504) is slidably connected to a side sealing plate (501), both sides of the side sealing plate (501) are provided with rectangular side grooves (502), the inner wall of the rectangular side groove (502) is fixedly connected to a corrugated connecting piece (505), a side of the long angle plate (504) close to the extended spring (503) is provided with a side square groove (506), the inner wall of the side square groove (506) is slidably connected to a side connecting rod (507), and one side of the side sealing plate (501) is fixedly connected to a side arc piece (508).

3. A combined multi-purpose wellhead gate valve for oil production according to claim 2, characterized in that: The side of the side sealing plate (501) away from the side arc piece (508) is fixedly connected to one side of the valve stem (2), the inner wall of the rectangular side groove (502) is fixedly connected to one end of the extended spring (503), the inner wall of the rectangular side groove (502) is slidably connected to one side of the long angle plate (504), the inner wall of the rectangular side groove (502) is fixedly connected to one end of the side connecting rod (507), one side of the corrugated connecting piece (505) is fixedly connected to one side of the long angle plate (504), a plurality of the side grooves (506) are provided and are evenly distributed on one side of the long angle plate (504), and a plurality of the side arc pieces (508) are provided and are evenly distributed on one side of the side sealing plate (501).

4. The combined multi-purpose wellhead gate valve for oil production according to claim 1 is characterized in that: The sand removal device (6) comprises an inscribed long plate (601), one side of the inscribed long plate (601) is fixedly connected to a side cylinder (602), the outer surface of the side cylinder (602) is sleeved with and fixedly connected to an arc-shaped scraper (603), the outer surface of the arc-shaped scraper (603) is fixedly connected to an outer brush (604), the outer surface of the arc-shaped scraper (603) is provided with an inclined arc hole (605), both sides of the side cylinder (602) are fixedly connected to side connecting plates (606), and one side of the side connecting plate (606) is fixedly connected to an annular push plate (607).

5. A combined multi-purpose wellhead gate valve for oil production according to claim 4, characterized in that: Both sides of the inboard long plate (601) are fixedly connected to the inner wall of the annular threaded tube (4), and the outer surface of the arc-shaped scraper (603) is slidably connected to the inner wall of the internally threaded oil tube (3).

6. A combined multi-purpose wellhead gate valve for oil production according to claim 4, characterized in that: The outer brushes (604) are provided in plurality and are evenly distributed on the outer surface of the arc-shaped scraper (603), and the inclined arc holes (605) are provided in plurality and are evenly distributed on the outer surface of the arc-shaped scraper (603).

7. The combined multi-purpose wellhead gate valve for oil production according to claim 1, characterized in that: The sand catching device (7) comprises a circular baffle (701), a sand catching hole (702) is provided on one side of the circular baffle (701), a conical circular plate (703) is fixedly connected to one side of the circular baffle (701), a cleaning mechanism (704) is fixedly connected to the outer surface of the conical circular plate (703), an oil-passing circular hole (705) is provided on the outer surface of the conical circular plate (703), and an arc-shaped inclined hole (706) is provided on the outer surface of the conical circular plate (703).

8. The combined multi-purpose wellhead gate valve for oil production according to claim 7, characterized in that: The outer surface of the circular baffle (701) is fixedly connected to the inner wall of the annular threaded tube (4); the outer surface of the conical circular plate (703) is fixedly connected to the inner wall of the annular threaded tube (4); a plurality of sand catching holes (702) are provided and are evenly distributed on the outer surface of the circular baffle (701); a plurality of oil-passing circular holes (705) are provided and are evenly distributed on the outer surface of the conical circular plate (703); and a plurality of arc-shaped inclined holes (706) are provided and are evenly distributed on the outer surface of the conical circular plate (703).

9. The combined multi-purpose wellhead gate valve for oil production according to claim 7, characterized in that: The cleaning mechanism (704) comprises a corrugated expansion ring (7041), a small thorn block (7042) is fixedly connected to the outer surface of the corrugated expansion ring (7041), an annular arc sheet (7043) is fixedly connected to the outer surface of the corrugated expansion ring (7041), and a concave arc hole (7044) is opened on the outer surface of the corrugated expansion ring (7041).

10. A combined multi-purpose wellhead gate valve for oil production according to claim 9, characterized in that: One side of the waveform expansion ring (7041) is fixedly connected to the outer surface of the conical circular plate (703); a plurality of small thorn blocks (7042) are provided and are evenly distributed on the outer surface of the waveform expansion ring (7041); a plurality of annular arc sheets (7043) are provided and are evenly distributed on the outer surface of the waveform expansion ring (7041); and a plurality of concave arc holes (7044) are provided and are evenly distributed on the outer surface of the waveform expansion ring (7041).

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