Hydraulic expansion type double-flat-plate gate valve for wellhead Christmas tree

Abstract

The invention discloses a hydraulic expansion type double-flat-plate gate valve for a wellhead Christmas tree. The hydraulic expansion type double-flat-plate gate valve comprises a valve body, a gate valve body, a main driving unit and an auxiliary driving unit. An oil receiving pipe and a flashboard channel are formed on the valve body; the oil receiving pipe is used for being communicated with an oil conveying pipe on a Christmas tree. The gate valve is in sliding connection with the inner surface of the flashboard channel, a locking block is arranged on the gate valve, a clamping groove is formed in the locking block, and the clamping groove is used for being clamped with the side wall of the bottom of the flashboard channel when the oil receiving pipe is closed by the gate valve; the main driving unit is connected with the gate valve, and the main driving unit is used for automatically driving the gate valve to open or close the oil receiving pipe; and the auxiliary driving unit is connected with the main driving unit and is used for manually driving the main driving unit, so that the main driving unit drives the gate valve to open or close the oil receiving pipe. The invention has the advantages of reducing impact loss and prolonging the service life of the gate valve.

Description

Technical Field

[0001] The invention belongs to the technical field of oil production equipment, specifically relates to a Christmas tree, and in particular to a hydraulic expansion type double flat gate valve for a wellhead Christmas tree. Background Art

[0002] The gate valve for the Christmas tree is installed on the Christmas tree and is mainly used to control the flow, pressure and direction of the fluid in the oil well. Among them, the flat gate valve relies on the adjustment of the gate plate to achieve opening and closing operations. When the guide hole on the gate plate moves to a position coaxial with the pipeline, the valve is fully open, and the medium can pass smoothly at this time; when the guide hole on the gate plate moves to a position deviating from the pipeline, the valve is in a closed state, and the gate plate fits tightly with the valve seat to achieve sealing. However, due to the small bending radius of the oil pipe four-way, the oil and gas transported in the pipe will cause long-term impact on the gate valve, causing the gate valve seal to fail, internal leakage, and then corrode the valve stem and other components inside the gate valve. In order to effectively solve such problems, a hydraulic expansion double flat gate valve for a wellhead Christmas tree is proposed. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0004] To this end, the present invention proposes a hydraulic expansion type double flat gate valve for a wellhead Christmas tree, which has the advantages of reducing impact loss and increasing the service life of the gate valve.

[0005] A hydraulic expansion double-plate gate valve for a wellhead Christmas tree according to an embodiment of the present invention comprises: a valve body, a gate valve, a main drive unit, and an auxiliary drive unit; an oil receiving pipe and a gate channel are formed on the valve body; the oil receiving pipe is used to connect the oil pipeline on the Christmas tree; the gate valve is slidably connected to the inner surface of the gate channel, and a locking block is provided on the gate valve, and a slot is formed on the locking block, and the slot is used to engage with the side wall at the bottom of the gate channel when the gate valve closes the oil receiving pipe; the main drive unit is connected to the gate valve, and the main drive unit is used to automatically drive the gate valve to open or close the oil receiving pipe; the auxiliary drive unit is connected to the main drive unit, and the auxiliary drive unit is used to manually drive the main drive unit so that the main drive unit drives the gate valve to open or close the oil receiving pipe.

[0006] According to one embodiment of the present invention, the gate valve includes: a main gate plate and an auxiliary gate plate, the main gate plate and the auxiliary gate plate are linked together, the main gate plate and the auxiliary gate plate are both connected to the locking block pin shaft, the main gate plate drives the auxiliary gate plate to move when the main gate plate moves, and the main gate plate and the auxiliary gate plate drive the locking block to rotate during the movement.

[0007] According to one embodiment of the present invention, a groove is formed on the side of the main gate plate facing the auxiliary gate plate, and a protrusion is formed on the side of the auxiliary gate plate facing the main gate plate. The groove matches the protrusion, and the groove and the protrusion are used to drive the auxiliary gate plate to move after the main gate plate moves a certain distance.

[0008] According to one embodiment of the present invention, a sealing gasket is provided in the gate channel, and the sealing gasket is sleeved on the main gate and the auxiliary gate. An extension portion is formed at the upper end of the sealing gasket, and an annular groove is formed on the inner surface of the extension portion. The annular groove is used to buffer part of the oil and gas scraped off the main gate and the auxiliary gate to prevent the oil and gas from flowing out of the valve body.

[0009] According to one embodiment of the present invention, the cross-section of the annular groove is an inverted V structure, and the opening of the annular groove faces the gate valve, the extension portion protrudes from the upper end of the gate channel, and a stopper is formed at the upper end of the auxiliary gate, and the stopper is the same as the extruded extension portion.

[0010] According to one embodiment of the present invention, one end of the extension portion away from the sealing gasket protrudes out of the gate channel.

[0011] According to one embodiment of the present invention, the gate valve also includes a valve stem, one end of which is connected to the main gate plate, and the main drive unit includes: a hydraulic cylinder and a hydraulic sleeve; a piston and a spring are provided in the hydraulic cylinder, the piston is connected to the other end of the valve stem, one end of the spring is connected to the piston, and the other end of the spring is connected to the inner wall of the hydraulic cylinder; the hydraulic sleeve is sleeved on the outer surface of the hydraulic cylinder, and a liquid oil pipeline is formed in the hydraulic sleeve, one end of the liquid oil pipeline is connected to the hydraulic cylinder, and the other end of the one end of the liquid oil pipeline is connected to a liquid pump, and the liquid pump is used to drive the liquid oil into the hydraulic cylinder so that the liquid oil pushes the piston.

[0012] According to one embodiment of the present invention, the auxiliary driving unit comprises a handwheel rod, one end of which extends into the hydraulic cylinder, the handwheel rod is movably connected to the hydraulic cylinder, and one end of the handwheel rod is located inside the spring.

[0013] According to one embodiment of the present invention, a notch is formed on a side of the piston facing the hand wheel rod.

[0014] According to one embodiment of the present invention, the auxiliary drive unit also includes a cylinder head, one end of the cylinder head is sleeved on the hydraulic casing, a buckle is formed at one end of the cylinder head, a row of teeth is provided on the outer wall of the hydraulic casing, the buckle and the teeth are interference fit, the handwheel rod passes through the cylinder head, and the handwheel rod is threadedly connected to the cylinder head.

[0015] The beneficial effect of the present invention is that the present invention adopts a locking block arranged on the gate valve, and utilizes the movement of the gate valve to drive the locking block to move, thereby completing the locking and disengagement of the locking block and the gate channel, thereby reducing the impact of oil and gas on the gate valve and increasing the service life of the gate valve;

[0016] The main drive unit is combined with the auxiliary drive unit to realize dual drive of the gate plate to cope with the phenomenon of loss of control of the main drive unit, thereby improving the safety of the gate valve operation.

[0017] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practicing the present invention.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention;

[0021] Figure 2 This is a schematic cross-sectional view of the overall structure when the present invention adopts a hand wheel rod;

[0022] Figure 3 It is a schematic diagram of the gate valve structure of the present invention;

[0023] Reference numerals:

[0024] 1. Valve body; 11. Oil connecting pipe; 21. Main gate plate; 22. Auxiliary gate plate; 221. Stopper; 23. Locking block; 231. Slot; 24. Valve stem; 3. Sealing gasket; 31. Extension; 41. Hydraulic cylinder; 411. Piston; 412. Spring; 42. Hydraulic casing; 51. Handwheel rod; 52. Cylinder head. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] The hydraulic expansion type double plate gate valve for a wellhead Christmas tree according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] like Figure 1-3 As shown, the hydraulic expansion double flat gate valve for a wellhead Christmas tree according to an embodiment of the present invention comprises: a valve body 1, a gate valve, a main drive unit, and an auxiliary drive unit; an oil receiving pipe 11 and a gate channel are formed on the valve body 1; the oil receiving pipe 11 is used to connect the oil pipeline on the Christmas tree; the gate valve is slidably connected to the inner surface of the gate channel, and a locking block 23 is provided on the gate valve, and a clamping groove 231 is formed on the locking block 23, and the clamping groove 231 is used to engage with the side wall at the bottom of the gate channel when the gate valve closes the oil receiving pipe 11; the main drive unit is connected to the gate valve, and the main drive unit is used to automatically drive the gate valve to open or close the oil receiving pipe 11; the auxiliary drive unit is connected to the main drive unit, and the auxiliary drive unit is used to manually drive the main drive unit, so that the main drive unit drives the gate valve to open or close the oil receiving pipe 11.

[0030] In this embodiment, the oil receiving pipe 11 is located at the upper end of the valve body 1, and the oil receiving pipe 11 passes through the left and right sides of the valve body 1 in the horizontal direction, the gate channel passes through the valve body 1 in the vertical direction, the gate channel intersects with the oil receiving pipe 11, and a guide hole is formed at the lower end of the gate valve along the opening direction of the oil receiving pipe 11. When the gate valve moves downward until the guide hole is completely separated from the oil receiving pipe 11, the locking block 23 is driven by the gate valve to rotate until the slot 231 abuts against the side wall of the lower end of the gate channel to achieve locking, thereby reducing the impact of oil and gas on the gate valve and extending the service life of the gate valve; in addition, a main drive unit and an auxiliary drive unit are used to realize dual drive of the gate to cope with the phenomenon of loss of control of the main drive unit, thereby improving the safety of the gate valve.

[0031] The gate valve includes: a main gate plate 21 and an auxiliary gate plate 22, which are linked and connected. The main gate plate 21 and the auxiliary gate plate 22 are pin-connected with a locking block 23. When the main gate plate 21 moves, the auxiliary gate plate 22 is driven to move. During the movement of the main gate plate 21 and the auxiliary gate plate 22, the locking block 23 is driven to rotate.

[0032] A V-shaped groove is formed on the side of the main gate plate 21 facing the auxiliary gate plate 22, and a V-shaped protrusion is formed on the side of the auxiliary gate plate 22 facing the main gate plate 21. The groove and the protrusion match each other, and the groove and the protrusion are used to drive the auxiliary gate plate 22 to move after the main gate plate 21 moves a certain distance.

[0033] In this embodiment, the guide hole includes a main guide hole and a secondary guide hole. The main guide hole is formed on the main gate plate 21, and the secondary guide hole is formed on the secondary gate plate 22. The diameters of the main gate plate 21 and the secondary gate plate 22 are the same. When the diversion operation is performed, the central axes of the main guide hole and the secondary guide hole are collinear. One side of the upper end of the lock block 23 is connected to the main gate plate 21 by a first latch, and the other side of the upper end of the lock block 23 is connected to the main gate plate 21 by a second latch. The slot 231 is located on the side wall of the lower end of the lock block 23; when the main gate plate 21 moves, the first latch drives one side of the upper end of the lock block 23 to move downward. After the main gate plate 21 moves a certain distance, the secondary gate plate 22 is driven to move by the traction force of the groove. In this process, the second latch is always higher than the first latch, so the lower end of the lock block 23 rotates to make the slot 231 stuck at the lower end of the gate channel, thereby achieving a fixed connection with the oil receiving pipe 11 and achieving a locking effect.

[0034] A sealing gasket 3 is provided in the gate channel, and the sealing gasket 3 is sleeved on the main gate plate 21 and the auxiliary gate plate 22. An extension portion 31 is formed at the upper end of the sealing gasket 3, and an annular groove is formed on the inner surface of the extension portion 31. The annular groove is used to buffer part of the oil and gas scraped off the main gate plate 21 and the auxiliary gate plate 22 by the sealing gasket 3 to prevent the oil and gas from flowing out of the valve body 1.

[0035] In this embodiment, an annular groove is opened on the inner surface of the extension portion 31 in the circumferential direction of the sealing gasket 3. During the upward movement of the main gate plate 21 and the auxiliary gate plate 22, the sealing gasket 3, which is tightly fitted with the main gate plate 21 and the auxiliary gate plate 22, initially scrapes off the oil on the outer walls of the main gate plate 21 and the auxiliary gate plate 22. When the main gate plate 21 and the auxiliary gate plate 22 pass through the extension portion 31, the extension portion 31 further scrapes off the oil on the outer walls of the main gate plate 21 and the auxiliary gate plate 22. During this process, since there is an annular groove between the extension portion 31 and the main gate plate 21 and the auxiliary gate plate 22, the scraped oil is temporarily stored in the annular groove, thereby avoiding the oil leakage caused by the extension portion 31 being located at the uppermost end of the gate channel. During the downward movement of the main gate plate 21 and the auxiliary gate plate 22, the oil in the annular groove is gradually brought out from under the sealing gasket 3.

[0036] The cross section of the annular groove is an inverted V structure, and the opening of the annular groove faces the main gate plate 21 and the auxiliary gate plate 22 . The extension portion 31 protrudes from the upper end of the gate channel. A stopper 221 is formed at the upper end of the auxiliary gate plate 22 , and the stopper 221 is the same as the extruded extension portion 31 .

[0037] In this embodiment, during the downward movement of the auxiliary gate plate 22, the stopper 221 on the auxiliary gate plate 22 gradually presses down the extension portion 31, causing the extension portion 31 to deform, thereby increasing its fit with the main gate plate 21 and the auxiliary gate plate 22, and further improving the sealing performance. During this process, due to the structure of the annular groove, the deformation path of the extension portion 31 is controllable. One end of the extension portion 31 away from the sealing gasket 3 protrudes from the gate channel.

[0038] The gate valve also includes a valve stem 24, one end of which is connected to the main gate plate 21, and the main driving unit includes: a hydraulic cylinder 41 and a hydraulic sleeve 42; a piston 411 and a spring 412 are provided in the hydraulic cylinder 41, the piston 411 is fixedly connected to the other end of the valve stem 24, one end of the spring 412 is connected to the piston 411, and the other end of the spring 412 is connected to the inner wall of the hydraulic cylinder 41; the hydraulic sleeve 42 is sleeved on the outer surface of the hydraulic cylinder 41, and a liquid oil pipeline is formed in the hydraulic sleeve 42, one end of the liquid oil pipeline is connected to the hydraulic cylinder 41, and the other end of one end of the liquid oil pipeline is connected to a liquid pump, and the liquid pump is used to drive the liquid oil into the hydraulic cylinder 41 so that the liquid oil pushes the piston 411.

[0039] In this embodiment, the piston 411 divides the hydraulic cylinder 41 into two chambers, and a first pipeline and a second pipeline are formed in the hydraulic sleeve 42. One end of the first pipeline is connected to one side of the piston 411, and the other end of the first pipeline is connected to a liquid pump, which is connected to a liquid storage tank. One end of the second pipeline is connected to the other side of the piston 411, and the other end of the second pipeline is connected to the liquid storage tank, so as to form a circuit. When the liquid pump is started, the hydraulic oil in the liquid storage tank is pumped to one side of the piston 411 to push the piston 411 to move to the other side. At this time, the spring 412 is deformed. When the liquid pump stops, the spring 412 is reset and drives the piston 411 to reset, so that the hydraulic oil returns to the liquid storage tank. The reciprocating movement of the piston 411 drives the valve stem 24 to move, and the moving valve stem 24 drives the movement of the main gate plate 21.

[0040] The auxiliary driving unit includes a handwheel rod 51 , one end of which extends into the hydraulic cylinder 41 , the handwheel rod 51 is movably connected to the hydraulic cylinder 41 , and one end of the handwheel rod 51 is located inside the spring 412 .

[0041] A notch is formed on a side of the piston 411 facing the hand wheel rod 51 .

[0042] The auxiliary drive unit also includes a cylinder cover 52, one end of which is sleeved on the hydraulic sleeve 42, a buckle is formed at one end of the cylinder cover 52, a row of teeth are provided on the outer wall of the hydraulic sleeve 42, the buckle and the teeth are interference fit, the handwheel rod 51 passes through the cylinder cover 52, and the handwheel rod 51 is threadedly connected to the cylinder cover 52.

[0043] In this embodiment, when the main drive unit is operating normally, the handwheel rod 51 is separated from the piston 411 and has a certain distance from the piston 411 to avoid interference with the movement of the piston 411. When manual control is required, the cylinder cover 52 is pushed downward to increase the overlap area between the cylinder cover 52 and the hydraulic sleeve 42, so that the handwheel rod 51 connected to the cylinder cover 52 enters the recess. The handwheel rod 51 is rotated to move the handwheel rod 51 linearly inward to push the piston 411 downward to push the gate valve and complete the action of closing the gate valve. When opening the gate valve, the handwheel rod 51 is reversed to move the handwheel rod 51 out of the cylinder cover 52, and the piston 411 is driven to reset under the action of the spring 412.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0045] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A hydraulic expansion double plate gate valve for a wellhead Christmas tree, characterized in that: include: A valve body (1), wherein an oil connection pipe (11) and a gate channel are formed on the valve body (1); the oil connection pipe (11) is used to connect the oil pipeline on the Christmas tree; A gate valve, the gate valve being slidably connected to the inner surface of the gate channel, the gate valve being provided with a locking block (23), the locking block (23) being formed with a clamping groove (231), the clamping groove (231) being used to clamp with the side wall at the bottom of the gate channel when the gate valve closes the oil receiving pipe (11); A main drive unit, the main drive unit is connected to the gate valve, and the main drive unit is used to automatically drive the gate valve to open or close the oil connection pipe (11); A secondary drive unit is connected to the main drive unit and is used to manually drive the main drive unit so that the main drive unit drives the gate valve to open or close the oil receiving pipe (11).

2. The hydraulic expansion double plate gate valve for wellhead Christmas tree according to claim 1, characterized in that: The gate valve comprises: a main gate plate (21) and an auxiliary gate plate (22); the main gate plate (21) and the auxiliary gate plate (22) are linked and connected; the main gate plate (21) and the auxiliary gate plate (22) are both pin-connected to a locking block (23); when the main gate plate (21) moves, the auxiliary gate plate (22) is driven to move; and when the main gate plate (21) and the auxiliary gate plate (22) move, the locking block (23) is driven to rotate.

3. The hydraulic expansion double plate gate valve for wellhead Christmas tree according to claim 2, characterized in that: A groove is formed on the side of the main gate plate (21) facing the auxiliary gate plate (22), and a protrusion is formed on the side of the auxiliary gate plate (22) facing the main gate plate (21). The groove matches the protrusion, and the groove and the protrusion are used to drive the auxiliary gate plate (22) to move after the main gate plate (21) moves a certain distance.

4. The hydraulic expansion double plate gate valve for a wellhead Christmas tree according to claim 3, characterized in that: A sealing gasket (3) is provided in the gate channel. The sealing gasket (3) is sleeved on the main gate (21) and the auxiliary gate (22). An extension portion (31) is formed at the upper end of the sealing gasket (3). An annular groove is formed on the inner surface of the extension portion (31). The annular groove is used to buffer part of the oil and gas scraped off the main gate (21) and the auxiliary gate (22) by the sealing gasket (3), so as to prevent the oil and gas from flowing out of the valve body (1).

5. The hydraulic expansion double plate gate valve for wellhead Christmas tree according to claim 4, characterized in that: The cross section of the annular groove is an inverted V structure, and the opening of the annular groove faces the gate valve. The extension portion (31) protrudes from the upper end of the gate channel. A stopper (221) is formed at the upper end of the auxiliary gate (22), and the stopper (221) is the same as the extruded extension portion (31).

6. The hydraulic expansion double plate gate valve for a wellhead Christmas tree according to claim 5, characterized in that: One end of the extension portion (31) away from the sealing gasket (3) protrudes out of the gate channel.

7. The hydraulic expansion double plate gate valve for a wellhead Christmas tree according to claim 6, characterized in that: The gate valve further comprises a valve stem (24), one end of which is connected to a main gate plate (21), and the main drive unit comprises: A hydraulic cylinder (41), wherein a piston (411) and a spring (412) are provided in the hydraulic cylinder (41), wherein the piston (411) is connected to the other end of the valve stem (24), one end of the spring (412) is connected to the piston (411), and the other end of the spring (412) is connected to the inner wall of the hydraulic cylinder (41). A hydraulic sleeve (42), wherein the hydraulic sleeve (42) is sleeved on the outer surface of the hydraulic cylinder (41), and a liquid oil pipeline is formed in the hydraulic sleeve (42), one end of the liquid oil pipeline is connected to the hydraulic cylinder (41), and the other end of the liquid oil pipeline is connected to a liquid pump, and the liquid pump is used to drive liquid oil into the hydraulic cylinder (41) so that the liquid oil pushes the piston (411).

8. The hydraulic expansion double plate gate valve for a wellhead Christmas tree according to claim 7, characterized in that: The auxiliary driving unit comprises a handwheel rod (51), one end of which extends into the hydraulic cylinder (41), the handwheel rod (51) is movably connected to the hydraulic cylinder (41), and one end of which is located inside the spring (412).

9. The hydraulic expansion double plate gate valve for a wellhead Christmas tree according to claim 8, characterized in that: A notch is formed on the side of the piston (411) facing the hand wheel rod (51).

10. The hydraulic expansion double plate gate valve for a wellhead Christmas tree according to claim 9, characterized in that: The auxiliary drive unit also includes a cylinder cover (52), one end of the cylinder cover (52) is sleeved on the hydraulic sleeve (42), one end of the cylinder cover (52) is formed with a buckle, an outer wall of the hydraulic sleeve (42) is provided with a row of buckles, the buckle and the buckles are interference fit with the buckles, the handwheel rod (51) passes through the cylinder cover (52), and the handwheel rod (51) is threadedly connected to the cylinder cover (52).

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