A low-to-high pressure conversion valve with automatic compensation seal and a sealing method thereof

Abstract

The present application relates to oil and gas lifting equipment technical field, specifically, the present application provides a kind of automatic compensation sealed low high pressure conversion valve, including valve body and the valve core rotatably arranged in valve body, the inner wall of the valve body is fixed with expansion hollow sealing ring, and the clearance between the valve body and the valve core is sealed by the expansion hollow sealing ring.The present application also provides a kind of sealing method of low high pressure conversion valve, and the clearance between the valve body and the valve core is sealed by expansion hollow sealing ring.The present application can avoid the problem of low high pressure gas leakage between the valve body and the valve core of high pressure conversion valve.

Description

TECHNICAL FIELD

[0001] The present application relates to the oil and gas lifting equipment technical field, and particularly relates to an automatic compensation sealing low-high pressure conversion valve and a sealing method thereof. BACKGROUND

[0002] A commonly used gas lifting oil extraction device is one way to rely on the high-pressure gas injected into the well from the ground to mix with the fluid produced by the oil layer in the wellbore, to reduce the density of the mixed liquid in the wellbore by using the expansion of the gas, and to lift the crude oil flowing into the well to the ground; another way is to use high-pressure gas to pump the gas lifting ball along the pipe string to the bottom of the well, and then rely on the thrust of the high-pressure gas and the gas lifting ball to lift the oil to the ground.

[0003] The gas lifting oil extraction device comprises a gas lifting ball, a ball receiving and launching device and a staged starting device, wherein the ball receiving and launching device is provided with a low-high pressure conversion valve, the gas lifting ball is launched into the valve body of the low-high pressure conversion valve from a ball inlet, and enters the ball inlet channel of the valve core, then the valve core is rotated to the state that the ball inlet channel is communicated with the high-pressure gas channel, the ball outlet channel is communicated with the ball outlet, and the high-pressure gas in the high-pressure gas channel forces the gas lifting ball to pass through the ball inlet channel and the ball outlet channel at high speed in sequence, and is shot out from the ball outlet.

[0004] However, there is a gap between the valve body and the valve core of the low-high pressure conversion valve, under the action of the pressure difference, part of the high-pressure gas will leak from the gap between the valve body and the valve core, and when there are sand particles in the high-pressure gas, the sand particles will accelerate the wear between the valve body and the valve core, leading to an increase in the gap and aggravating the leakage. SUMMARY

[0005] The purpose of the present application includes providing an automatic compensation sealing low-high pressure conversion valve, which is designed for the low-high pressure conversion valve, and can avoid the problem of leakage of low-high pressure gas between the valve body and the valve core of the high-pressure conversion valve.

[0006] Another purpose of the present application includes providing a sealing method of a low-high pressure conversion valve, which is designed for the sealing of the low-high pressure conversion valve, and can avoid the problem of leakage of low-high pressure gas between the valve body and the valve core of the high-pressure conversion valve.

[0007] Embodiments of the present application are implemented by the following technical solutions:

[0008] An automatic compensation sealing low-high pressure conversion valve comprises a valve body and a valve core rotatably arranged in the valve body, and an expansion type hollow sealing ring is fixed to the inner wall of the valve body, which seals the gap between the valve body and the valve core.

[0009] In an embodiment of the present application, the high-pressure gas channel of the valve body is communicated with a pressure reducing device, and the low-pressure output end of the pressure reducing device is communicated with the expansion type hollow sealing ring.

[0010] In an embodiment of the present application, the inflatable hollow sealing ring comprises a first sealing ring and a second sealing ring, the first sealing ring seals the gap between the valve body and the valve core, and the second sealing ring seals the gap between the ball inlet / outlet passage and the high-pressure gas passage and the valve core.

[0011] In an embodiment of the present application, the pressure reducing device comprises an electrically controlled pressure reducing valve and a shunt, one end of the electrically controlled pressure reducing valve is communicated with the high-pressure gas passage, the other end of the electrically controlled pressure reducing valve is communicated with the shunt, and the shunt is communicated with the first sealing ring and the second sealing ring respectively.

[0012] In an embodiment of the present application, the valve body is provided with a communication hole, one end of the communication hole is communicated with the inner cavity of the valve body, and the other end of the communication hole is communicated with the inflatable hollow sealing ring.

[0013] In an embodiment of the present application, the inflatable hollow sealing ring comprises a first sealing ring and a second sealing ring, the first sealing ring seals the gap between the valve body and the valve core, and the second sealing ring seals the gap between the ball inlet / outlet passage and the high-pressure gas passage and the valve core.

[0014] In an embodiment of the present application, the inflatable hollow sealing ring is a rubber hollow sealing ring.

[0015] In an embodiment of the present application, the rubber hollow sealing ring is provided with a metal mesh.

[0016] A sealing method of a low-high pressure conversion valve, high-pressure gas is led out from the high-pressure gas passage, and is reduced by the pressure reducing device to form a shunt as an inflation gas source, the inflation gas source is filled into the inflatable hollow sealing ring, and the inflatable hollow sealing ring is used to seal the gap between the valve body and the valve core.

[0017] A sealing method of a low-high pressure conversion valve, gas leaked to the gap between the valve body and the valve core is used as an inflation gas source, the inflation gas source is filled into the inflatable hollow sealing ring, and the inflatable hollow sealing ring is used to adaptively seal the gap between the valve body and the valve core.

[0018] The technical scheme of the embodiment of the present application has at least the following advantages and beneficial effects:

[0019] The embodiment of the present application sets the expansion hollow sealing ring between the valve body and the valve core of the low-high pressure conversion valve, uses the PLC, the electric control pressure reducing valve and the shunt row to cooperate with each other, actively compensates the air pressure in the expansion hollow sealing ring, makes the expansion hollow sealing ring expand, realizes the sealing between the valve body and the valve core, can also make the gap between the valve body and the valve core and the inside of the expansion hollow sealing ring conduct through the cooperation of the communication hole on the valve body and the air nozzle on the expansion hollow sealing ring, automatically compensates the air pressure in the expansion hollow sealing ring, realizes the sealing between the valve body and the valve core, avoids the air leakage problem of the low-high pressure conversion valve. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced below, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and other related drawings can also be obtained by those skilled in the art without creative labor on the premise of the drawings.

[0021] Figure 1 It is a structure schematic view of the low-high pressure conversion valve in the embodiment of the present application.

[0022] Figure 2 It is a schematic view of the second sealing ring in the low-high pressure conversion valve in the embodiment of the present application being installed in the inner wall of the valve body.

[0023] Figure 3 It is a schematic view of the valve core and the first sealing ring and the second sealing ring in the low-high pressure conversion valve in the embodiment of the present application being omitted after the valve body.

[0024] Figure 4 It is a schematic view of the valve core of the low-high pressure conversion valve in the embodiment of the present application being in the first state.

[0025] Figure 5 It is a schematic view of the valve core of the low-high pressure conversion valve in the embodiment of the present application being in the second state.

[0026] Figure 6 It is a schematic view of the communication hole of the valve body in the low-high pressure conversion valve in the embodiment of the present application.

[0027] Legend: 1-valve body, 11-ball inlet channel, 111-ball inlet channel outlet, 12-ball outlet channel, 121-ball outlet channel inlet, 13-high pressure gas channel, 131-high pressure gas channel outlet, 2-valve core, 21-switching channel, 211-first channel, 212-second channel, 31-first sealing ring, 32-second sealing ring, 41-shunt row, 5-communication hole. DETAILED DESCRIPTION

[0028] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application generally described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0030] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] In the description of the present application, it should be noted that if the terms "inner", "outer" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, or the orientation or position relationship of the product in use, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation of the present application.

[0032] In the description of the present application, it should also be noted that unless otherwise specified and limited, if the terms "set", "install", "configure", "connect" are broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] Embodiment 1

[0034] Please refer to Figure 1, the embodiment provides a kind of low high-pressure conversion valve of automatic compensation seal, including valve body 1 and the valve core 2 rotatably arranged in valve body 1, in the embodiment, valve body 1 is hollow cylindrical structure, valve body 1 is equipped with ball inlet channel 11, ball outlet channel 12 and high-pressure gas channel 13, ball inlet channel 11 is coaxially arranged with ball outlet channel 12, ball inlet channel 11, ball outlet channel 12 and high-pressure gas channel 13 are 90 ° apart from each other distribution.In the embodiment, the valve core 2 is cylindrical structure, and the valve core 2 is rotated under the driving of motor or hydraulic motor or pneumatic motor and the like driving device located outside valve body 1.Please see Figure 4 And Figure 5 , switch channel 21 is arranged in the valve core 2, and the switch channel 21 includes first channel 211 and second channel 212, which are communicated with each other, when the gas lift ball is put into the low high-pressure conversion valve, the valve core 2 is located in the first state, i.e. the first channel 211 is aligned with the ball inlet channel 11 of the valve body 1, and the second channel 212 is closed due to the valve body 1, when the gas lift ball is put into the switch channel 21, the driving device drives the valve core 2 to rotate to the second state, i.e. the first channel 211 is aligned with the ball outlet channel 12, and the second channel 212 is aligned with the high-pressure gas channel 13, the high-pressure gas in the high-pressure gas channel 13 enters the switch channel 21, and the high-pressure gas is used to force the gas lift ball to accelerate and rush out of the switch channel 21 until the gas lift ball is shot into the ball outlet channel 12, and then the valve core 2 is reset to the first state, so as to be circulated back and forth.

[0035] Please see Figure 2 And Figure 3 In the embodiment, the inner wall of the valve body 1 is fixed with an inflatable hollow sealing ring, and the inflatable hollow sealing ring includes a first sealing ring 31 and a second sealing ring 32, the first sealing ring 31 is provided with a pair of sealing gaps between the valve body 1 and the valve core 2, and the second sealing ring 32 is provided with three sealing gaps between the valve body 1 and the valve core 2, respectively sealing the gap between the ball inlet channel outlet 111 and the valve core 2, the gap between the ball outlet channel inlet 121 and the valve core 2, and the gap between the high-pressure gas channel outlet 131 and the valve core 2, to avoid high-pressure gas leakage between the valve body 1 and the valve core 2. The inflatable hollow sealing ring seals the gap between the valve body 1 and the valve core 2.

[0036] It should be noted that, as Figure 2 Indicated, the valve body 1 is provided with a mounting groove for mounting the first sealing ring 31 and the second sealing ring 32, and the second sealing ring 32 is fixed in the mounting groove to avoid the second sealing ring 32 from moving freely.

[0037] It should be noted that the first sealing ring 31 and the second sealing ring 32 are provided with air nozzles for inflation and deflation, and the air nozzles adopt the prior art, as long as the first sealing ring 31 and the second sealing ring 32 can be inflated and deflated freely.

[0038] Please see Figure 1In the embodiment, the high-pressure gas passage 13 of the valve body 1 is communicated with a pressure reducing device, which comprises an electrically controlled pressure reducing valve (not shown in the figure) and a shunt discharge 41, and is further communicated with a gas pressure detector (not shown in the figure) between the electrically controlled pressure reducing valve and the shunt discharge 41. The electrically controlled pressure reducing valve and the gas pressure detector are both electrically connected with a control device (not shown in the figure). The gas pressure detector can be a digital pressure gauge of the prior art, and the control device can be a PLC. The digital pressure gauge detects the output pipeline pressure of the electrically controlled pressure reducing valve in real time, and the control device acquires the detection data of the digital pressure gauge in real time. One end of the electrically controlled pressure reducing valve is communicated with the high-pressure gas passage 13, and the other end of the electrically controlled pressure reducing valve is communicated with the shunt discharge 41, which is respectively communicated with the first sealing ring 31 and the second sealing ring 32. Since the gas pressure in the high-pressure gas passage 13 is too high, it is not suitable to be directly introduced into the first sealing ring 31 and the second sealing ring 32. If the high-pressure gas is directly introduced into the first sealing ring 31 and the second sealing ring 32, the first sealing ring 31 and the second sealing ring 32 may be broken. Therefore, the embodiment adjusts the pressure of the introduced gas flow by the electrically controlled pressure reducing valve to ensure that the first sealing ring 31 and the second sealing ring 32 can normally expand by a preset expansion amount, so as to seal the gap between the valve body 1 and the valve core 2, and ensure that the first sealing ring 31 and the second sealing ring 32 will not be broken.

[0039] The electrically controlled pressure reducing valve is controlled by the PLC to adjust the gas pressure to ensure that the first sealing ring 31 and the second sealing ring 32 maintain sufficient expansion amount, so as to avoid gas leakage between the valve body 1 and the valve core 2, thereby achieving the purpose of actively compensating the gas pressure in the rubber hollow sealing ring.

[0040] In the embodiment, the expansion type hollow sealing ring is a rubber hollow sealing ring, and a metal mesh is arranged in the rubber hollow sealing ring to increase the wear resistance and service life of the expansion type hollow sealing ring.

[0041] Embodiment 2

[0042] Please refer to Figure 6 The embodiment provides another automatic compensation sealing low-high pressure conversion valve, which is different from the embodiment 1 in that it can automatically compensate the gas pressure in the rubber hollow sealing ring, and the specific implementation is as follows:

[0043] The valve body 1 of the embodiment is provided with a communication hole 5, one end of which communicates with the inner cavity of the valve body 1, and the other end of which communicates with the air nozzle of the inflatable hollow sealing ring, i.e. the first sealing ring 31 and the second sealing ring 32. In the initial use of the embodiment, the valve body 1 and the valve core 2 are kept from leaking due to the sealing of the inflatable hollow sealing ring. When the gap between the valve core 2 and the inflatable hollow sealing ring increases due to wear after the low-to-high pressure conversion valve is used for a period of time, part of the high-pressure gas leaks into the inner cavity of the valve body 1 through the gap, and then enters the inflatable hollow sealing ring through the communication hole 5. With the increase of the amount of high-pressure gas leakage, the inflatable hollow sealing ring also expands synchronously, thereby achieving the effect of self-adapting gap of the inflatable hollow sealing ring, and automatically adjusting the expansion amount of the inflatable hollow sealing ring, so as to realize the purpose of automatically compensating the gas pressure in the rubber hollow sealing ring.

[0044] Embodiment 3

[0045] A sealing method of the low-to-high pressure conversion valve as described in Embodiment 1, high-pressure gas is led out from the high-pressure gas passage 13, and after being decompressed and branched by the electrically controlled decompression valve and the branch discharge 41, the decompressed and branched gas is used as an inflation gas source. The inflation gas source is inflated into the first sealing ring 31 and the second sealing ring 32, so as to actively compensate the gas pressure in the rubber hollow sealing ring. The gap between the valve body 1 and the valve core 2 is sealed by the first sealing ring 31 and the second sealing ring 32, so as to solve the problem of low high-pressure gas leakage into the gap between the valve body 1 and the valve core 2 of the low-to-high pressure conversion valve.

[0046] Embodiment 4

[0047] A sealing method of the low-to-high pressure conversion valve as described in Embodiment 2, the gas leaked into the gap between the valve body 1 and the valve core 2 is used as an inflation gas source. The inflation gas source is inflated into the first sealing ring 31 and the second sealing ring 32, so as to automatically compensate the gas pressure in the rubber hollow sealing ring. The gap between the valve body 1 and the valve core 2 is adaptively sealed by the inflatable hollow sealing ring, so as to solve the problem of low high-pressure gas leakage into the gap between the valve body 1 and the valve core 2 of the low-to-high pressure conversion valve.

[0048] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A low-to-high pressure switching valve with automatic compensation seal comprising a valve body and a valve core rotatably provided in the valve body, characterized in that, The valve body is provided with a ball inlet channel, a ball outlet channel and a high-pressure gas channel, the ball inlet channel and the ball outlet channel are coaxially arranged, and the ball inlet channel, the ball outlet channel and the high-pressure gas channel are distributed at an interval of 90° from each other; An expanded hollow sealing ring is fixed to the inner wall of the valve body, the expanded hollow sealing ring comprises a first sealing ring and a second sealing ring, the first sealing ring seals the gap between the valve body and the valve core, and the second sealing ring seals the gap between the ball inlet channel outlet / ball outlet channel inlet / high-pressure gas channel outlet and the valve core, the first sealing ring and the second sealing ring are respectively provided with a gas nozzle that can be inflated and deflated; The valve body is further provided with a communication hole, one end of the communication hole communicates with the inner cavity of the valve body, and the other end of the communication hole communicates with the gas nozzle, so that the gas leaked between the valve body and the valve core serves as an inflation gas source, the inflation gas source is filled into the first sealing ring and the second sealing ring, and the first sealing ring and the second sealing ring are used to adaptively seal the gap between the valve body and the valve core; The high-pressure gas channel of the valve body is communicated with a pressure reducing device, the pressure reducing device comprises an electrically controlled pressure reducing valve and a shunt, one end of the electrically controlled pressure reducing valve communicates with the high-pressure gas channel, the other end of the electrically controlled pressure reducing valve communicates with the shunt, the shunt respectively communicates with the first sealing ring and the second sealing ring, and the pressure reducing device is used to reduce and shunt the high-pressure gas led out from the high-pressure gas channel as an inflation gas source, and fill the inflation gas source into the first sealing ring and the second sealing ring.

2. The self-compensating sealed low-to-high pressure transfer valve according to claim 1, wherein, The expanded hollow sealing ring is a rubber hollow sealing ring.

3. The self-compensating sealed low-to-high pressure transfer valve of claim 2, wherein, A metal mesh is arranged in the rubber hollow sealing ring.

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