Wellhead device with pressure adjusting function

Abstract

The invention discloses a well head device with a pressure adjusting function, and relates to the technical field of well head devices, the well head device comprises an oil pipe, a pressure adjusting device, a first electromagnetic valve and a pressure balancing device, the oil pipe is connected with the pressure adjusting device, the oil pipe is connected with the first electromagnetic valve, and the oil pipe is connected with the pressure balancing device; the pressure adjusting device is connected with the first electromagnetic valve and the pressure balancing device, the pressure adjusting device has the functions of detecting and adjusting pressure, the pressure balancing device is used for assisting the pressure adjusting device in adjusting the pressure of the oil pipe, the oil pipe is used for conveying liquid, and the first electromagnetic valve is used for releasing gas.

Description

Technical Field

[0001] The invention relates to the technical field of wellhead devices, in particular to a wellhead device with a pressure regulating function. Background Art

[0002] With the continuous development of science and technology, people are exploiting underground resources more and more frequently. Among them, the exploitation of underground liquid resources is particularly important. Petroleum is one of the liquid resources. The main component of petroleum is a mixture of various alkanes. It is a substance formed over a long period of time. It is often used as fuel and gasoline. It is also a raw material for chemical products.

[0003] Today, people's demand for oil is becoming more and more vigorous. When oil is mined, the complex pressure changes in the underground environment often cause the liquid pressure to change all the time when the oil is extracted, resulting in excessive pressure causing oil gushing, and in severe cases, pipeline bursts. The pressure is too low and the oil flow rate is too small, which reduces the efficiency of oil extraction. Summary of the invention

[0004] The object of the present invention is to provide a wellhead device with a pressure regulating function to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A wellhead device with a pressure regulating function, the wellhead device comprises an oil pipe, a pressure regulating device, a first solenoid valve and a pressure balancing device, the oil pipe is connected to the pressure regulating device, the oil pipe is connected to the first solenoid valve, the oil pipe is connected to the pressure balancing device, the pressure regulating device is connected to the first solenoid valve, and the pressure regulating device is connected to the pressure balancing device.

[0007] The pressure on the upper and lower sides of the pressure regulating device is detected by the pressure regulating device, and the pressure regulating device adjusts the liquid flow in the oil pipe according to the detection result. When the pressure below the pressure regulating device increases, the pressure is controlled by reducing the flow through the pressure regulating device below the pressure regulating device. When the pressure below the pressure regulating device decreases, the first solenoid valve is opened to increase the flow of liquid passing through the pressure regulating device below the pressure regulating device, and the pressure on the pressure regulating device is adjusted. When the pressure below the pressure regulating device exceeds the adjustment range, the pressure balancing device is opened, and the liquid below the pressure regulating device flows into the pressure balancing device, thereby reducing the pressure below the pressure regulating device to within the adjustment range. When the pressure below the pressure regulating device is lower than the adjustment range, the liquid below the pressure regulating device is sent to the top of the pressure regulating device through the pressure balancing device to increase the pressure above the pressure regulating device.

[0008] Furthermore, a detection installation chamber and a pressure chamber are provided on the oil pipe. There are two detection installation chambers. The detection installation chamber is connected to the pressure regulating device. The pressure chamber is an annular groove. The pressure chamber is connected to the pressure regulating device. The pressure chamber is connected to the input end pipeline of the first solenoid valve.

[0009] The pressure chamber serves as the main gas delivery chamber, which is used to deliver the regulating gas of the pressure regulating device. At the same time, the pressure in the pressure chamber is also adjusted through the first solenoid valve. When the pressure in the pressure chamber needs to be reduced, the first solenoid valve is opened to deflate the pressure chamber, thereby reducing the pressure in the pressure chamber. The detection installation chamber serves as the installation basis for the installation of the components of the pressure regulating device.

[0010] Furthermore, a plurality of sealing rings are provided on the detection installation cavity, the outer ring of the sealing ring is tightly connected to the detection installation cavity, and the inner ring of the sealing ring is connected to the pressure regulating device.

[0011] The sealing ring is used as the main sealing device. The sealing effect is increased by setting multiple sealing rings, so that the oil pipe liquid cannot enter the interior of the pressure regulating device through the connection gap between the detection installation cavity and the pressure regulating device.

[0012] Furthermore, the pressure regulating device includes a regulating pump, a regulating tube, a regulating airbag, a gas delivery tube and a pressure detector. The output end of the regulating pump is connected to the pressure chamber pipeline, the input end of the regulating pump is connected to the atmosphere, the regulating tube is tightly connected to the inner wall of the oil pipe, a plurality of regulating holes are provided on the regulating tube, the regulating airbag is placed in the regulating hole, the regulating airbag is connected to the gas delivery tube, the gas delivery tube is connected to the pressure chamber, the gas delivery tube is tightly connected to the pressure chamber, the pressure detector is placed in the detection installation cavity, the pressure detector is tightly connected to the detection installation cavity, there are two pressure detectors, the two pressure detectors are distributed at the upper and lower sides of the regulating tube, the pressure detector is electrically connected to the regulating pump, and the pressure detector is electrically connected to the first solenoid valve.

[0013] The regulating tube serves as the main installation basis and is used to position the installation of other components. At the beginning of the adjustment, there is a certain amount of gas in the regulating airbag to adjust the pressure. When the pressure detector under the regulating tube detects an increase in pressure, the liquid flow through the regulating tube also increases. The pressure detector transmits an electrical signal to the regulating pump, and the regulating pump begins to deliver gas to the pressure chamber, which enters the regulating airbag through the gas delivery tube. The regulating airbag begins to inflate and expand, causing the cross-sectional area of ​​the liquid flow in the regulating hole to become smaller, thereby reducing the flow of liquid from the bottom of the regulating tube into the top of the regulating tube. The flow above the regulating tube is reduced, thereby reducing the pressure above the regulating tube, until the pressure above the regulating tube drops to a safe range, and the adjustment is completed. The regulating pump stops delivering gas. When the pressure detector under the regulating tube detects a decrease in pressure, the flow of liquid through the regulating tube is also reduced. The pressure detector transmits an electrical signal to the first solenoid valve, and the first solenoid valve opens. The gas in the regulating airbag enters the pressure chamber through the gas delivery tube, and then enters the first solenoid valve through the pressure chamber, and then flows out through the first solenoid valve, causing the regulating airbag to deflate smaller, resulting in a larger cross-sectional area for liquid flow in the regulating hole, thereby increasing the flow of liquid from the bottom of the regulating tube into the top of the regulating tube. The flow above the regulating tube is increased, thereby increasing the pressure above the regulating tube, until the pressure above the regulating tube is increased to a safe range, and the first solenoid valve is closed to stop gas discharge.

[0014] Furthermore, the pressure detector includes a detection plate, a detection rod and a magnet. A sealing ring is sleeved on the outer side of the pressure detector. The detection rod and the detection plate are tightly connected. The end of the detection rod away from the detection plate is tightly connected to the magnet.

[0015] The detection plate serves as the main force-bearing plate, and the flow of liquid provides pressure on the detection plate. When the pressure provided by the liquid increases, the detection plate begins to move toward the magnet, thereby driving the detection rod to move. The movement of the detection rod causes the magnet to move. When the pressure provided by the liquid decreases, the detection plate begins to move away from the magnet, thereby driving the detection rod to move. The movement of the detection rod causes the magnet to move.

[0016] Furthermore, the pressure detector also includes an electromagnetic coil, a coil mounting body and a reset spring. The coil mounting body and the detection mounting cavity are tightly connected, the electromagnetic coil and the coil mounting body are connected, the reset spring and the magnet are tightly connected, and the reset spring is tightly connected to the coil mounting body at one end away from the magnet.

[0017] When the pressure provided by the liquid increases, the detection plate starts to move toward the detection magnet, thereby driving the magnet to move. The movement of the magnet causes the magnetic field generated by the magnet to be cut by the electromagnetic coil in the coil installation body, resulting in a change in magnetic flux, thereby generating an induced current, thereby controlling the opening and closing of the regulating pump. When the pressure provided by the liquid decreases, the detection plate starts to move away from the magnet under the action of the reset spring, and finally drives the magnet to move. The movement of the magnet causes the magnetic field generated by the magnet to be cut by the electromagnetic coil in the coil installation body, resulting in a change in magnetic flux, thereby generating an induced current. The generated induced current is sent to the first solenoid valve to control the opening of the first solenoid valve.

[0018] Furthermore, a coil mounting cavity and a spring mounting cavity are provided on the coil mounting body, the electromagnetic coil is placed in the coil mounting cavity, the electromagnetic coil and the coil mounting cavity are tightly connected, the magnet is placed in the spring mounting cavity, the magnet and the spring mounting cavity are slidingly connected, the return spring is placed in the spring mounting cavity, and the end of the return spring away from the magnet is tightly connected to the spring mounting cavity.

[0019] The coil installation cavity is used to install the electromagnetic coil, and also collects the magnetic flux changes caused by cutting the magnetic flux lines to output the current. The spring installation cavity is used to install the reset spring and the magnet, and also provides a movement path for the magnet to cut the magnetic flux lines, making it easier for the electromagnetic coil to cut the magnetic field generated by the magnet to cause changes in the magnetic flux.

[0020] Furthermore, the pressure balancing device includes a balancing box, a balancing pump, an input pipe, an output pipe, a connecting pipe and a second solenoid valve. The balancing box is connected to the input pipe, and the bottom end of the input pipe is located one to three centimeters above the bottom surface of the balancing box. The balancing box is connected to the connecting pipe, and the connecting pipe is connected to the oil pipe. A second solenoid valve is arranged on the connecting pipe, and the second solenoid valve is tightly connected to the connecting pipe. The output end of the balancing pump is tightly connected to the output pipe, and the output pipe is connected to the oil pipe located above the regulating pipe.

[0021] When the pressure below the regulating tube exceeds the detection range, the second solenoid valve opens, and the liquid below the regulating tube flows into the balancing tank to reduce the pressure below the regulating tube. When the pressure below the regulating tube returns to the detection range, the second solenoid valve closes. When the pressure gradually stabilizes, the balancing pump opens to send the liquid in the balancing tank from the input pipe to the output pipe, and finally directly to the top of the regulating tube to discharge the liquid in the balancing tank. When the pressure below the regulating tube is lower than the detection range, the second solenoid valve opens, and the liquid below the regulating tube flows into the balancing tank. At the same time, the balancing pump opens to send the liquid flowing in from the bottom of the regulating tube to the top of the regulating tube, thereby increasing the pressure above the regulating tube.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. By setting pressure detectors on the upper and lower sides of the regulating tube to detect the pressure in the tube, the opening of the regulating pump is controlled according to the detection results, thereby controlling the inflation and deflation of the regulating airbag, thereby controlling the flow of liquid in the tube, thereby controlling the pressure above the regulating tube, and controlling the pressure above the regulating tube within a safe range.

[0024] 2. By setting up a pressure balancing device, the pressure below the regulating pipe is controlled to be lower or higher than the pressure variation range that can be adjusted by the regulating airbag. When the pressure is lower than the adjustment range, the pressure above the regulating pipe will be increased through the balancing pump to ensure the liquid flow. When the pressure below the regulating pipe is higher than the adjustment range, the liquid will be stored in the balancing box to reduce the pressure below the regulating pipe, thereby reducing the possibility of oil pipe bursting below the regulating pipe.

[0025] 3. A sealing ring is provided to prevent the liquid in the oil pipe from flowing into the pressure detector, thereby causing damage to the pressure detector and causing it to fail. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic structural diagram of the pressure regulating device of the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of a first solenoid valve of the present invention;

[0029] Figure 4 for Figure 3 AA section view of the view;

[0030] Figure 5 for Figure 4 A partial C magnified view of;

[0031] Figure 6 It is a schematic diagram of the structure of the pressure balancing device of the present invention;

[0032] Figure 7 for Figure 6 BB section view of the view.

[0033] In the figure: 1. oil pipe; 11. detection installation cavity; 111. sealing ring; 12. pressure cavity; 2. pressure regulating device; 21. regulating pump; 22. regulating pipe; 221. regulating hole; 23. regulating airbag; 24. gas delivery pipe; 25. pressure detector; 251. detection plate; 252. detection rod; 253. magnet; 254. electromagnetic coil; 255. coil installation body; 2551. coil installation cavity; 2552. spring installation cavity; 256. reset spring; 3. first solenoid valve; 4. pressure balancing device; 41. balancing box; 42. balancing pump; 43. input pipe; 44. output pipe; 45. connecting pipe; 46. second solenoid valve. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example: Figure 1-Figure 7 As shown, the present invention provides a technical solution for a wellhead device with a pressure regulating function, including an oil pipe 1, a pressure regulating device 2, a first solenoid valve 3 and a pressure balancing device 4, the oil pipe 1 is connected to the pressure regulating device 2, the oil pipe 1 is connected to the first solenoid valve 3, the oil pipe 1 is connected to the pressure balancing device 4, the pressure regulating device 2 is connected to the first solenoid valve 3, and the pressure regulating device 2 is connected to the pressure balancing device 4.

[0036] The pressure on the upper and lower sides of the pressure regulating device 2 is detected by the pressure regulating device 2, and the pressure regulating device 2 adjusts the liquid flow in the oil pipe 1 according to the detection result. When the pressure below the pressure regulating device 2 increases, the pressure is controlled by reducing the flow through the pressure regulating device 2 below the pressure regulating device 2. When the pressure below the pressure regulating device 2 decreases, the first solenoid valve 3 is opened to increase the flow of liquid passing through the pressure regulating device 2 below, and the pressure on the pressure regulating device 2 is adjusted. When the pressure below the pressure regulating device 2 exceeds the adjustment range, the pressure balancing device 4 is opened, and the liquid below the pressure regulating device 2 flows into the pressure balancing device 4, thereby reducing the pressure below the pressure regulating device 2 to within the adjustment range. When the pressure below the pressure regulating device 2 is lower than the adjustment range, the liquid below the pressure regulating device 2 is sent to the top of the pressure regulating device 2 through the pressure balancing device 4, thereby increasing the pressure above the pressure regulating device 2.

[0037] like Figure 1 , Figure 4 , Figure 5 and Figure 7 As shown, a detection installation chamber 11 and a pressure chamber 12 are provided on the oil pipe 1. There are two detection installation chambers 11. The detection installation chamber 11 is connected to the pressure regulating device 2. The pressure chamber 12 is an annular groove. The pressure chamber 12 is connected to the pressure regulating device 2. The pressure chamber 12 is connected to the input end pipeline of the first solenoid valve 3.

[0038] The pressure chamber 12 serves as the main gas delivery chamber, which is used to deliver the regulating gas of the pressure regulating device 2. At the same time, the pressure in the pressure chamber 12 is also adjusted through the first solenoid valve 3. When the pressure in the pressure chamber 12 needs to be reduced, the first solenoid valve 3 is opened to deflate the pressure chamber 12, thereby reducing the pressure in the pressure chamber 12. The detection installation chamber 11 is used as an installation basis for installing the components of the pressure regulating device 2.

[0039] like Figure 4 and Figure 5 As shown, a plurality of sealing rings 111 are provided on the detection installation cavity 11 , the outer ring of the sealing ring 111 is tightly connected to the detection installation cavity 11 , and the inner ring of the sealing ring 111 is connected to the pressure regulating device 2 .

[0040] The sealing ring 111 is used as the main sealing device. By providing a plurality of sealing rings 111 , the sealing effect is increased so that the liquid in the oil pipe 1 cannot pass through the connection gap between the detection installation cavity 11 and the pressure regulating device 2 and enter the interior of the pressure regulating device 2 .

[0041] like Figure 2 , Figure 4 and Figure 7 As shown, the pressure regulating device 2 includes a regulating pump 21, a regulating tube 22, a regulating airbag 23, a gas delivery tube 24 and a pressure detector 25. The output end of the regulating pump 21 is connected to the pressure chamber 12 through a pipeline, the input end of the regulating pump 21 is connected to the atmosphere, the regulating tube 22 is tightly connected to the inner wall of the oil pipe 1, a plurality of regulating holes 221 are provided on the regulating tube 22, the regulating airbag 23 is placed in the regulating hole 221, the regulating airbag 23 is connected to the gas delivery tube 24, the gas delivery tube 24 is connected to the pressure chamber 12, the gas delivery tube 24 is tightly connected to the pressure chamber 12, the pressure detector 25 is placed in the detection installation cavity 11, the pressure detector 25 is tightly connected to the detection installation cavity 11, there are two pressure detectors 25, the two pressure detectors 25 are distributed at the upper and lower sides of the regulating tube 22, the pressure detector 25 is electrically connected to the regulating pump 21, and the pressure detector 25 is electrically connected to the first solenoid valve 3.

[0042] The regulating tube 22 is used as the main installation basis for the installation and positioning of other components. At the beginning of the adjustment, there is a certain amount of gas in the regulating airbag 23 for adjusting the pressure. When the pressure detector 25 below the regulating tube 22 detects that the pressure increases, the liquid flow through the regulating tube 22 also increases. The pressure detector 25 transmits an electrical signal to the regulating pump 21, and the regulating pump 21 starts to deliver gas to the pressure chamber 12, which enters the regulating airbag 23 through the gas delivery tube 24. The regulating airbag 23 begins to inflate and expand, resulting in a smaller cross-sectional area of ​​liquid flow in the regulating hole 221, thereby reducing the flow of liquid from the bottom of the regulating tube 22 into the top of the regulating tube 22. The flow above the regulating tube 22 is reduced, thereby reducing the pressure above the regulating tube 22, until the pressure above the regulating tube 22 is reduced to a safe range, and the adjustment is completed. The throttling pump 21 stops delivering gas. When the pressure detector 25 below the regulating tube 22 detects a pressure reduction, the flow of liquid through the regulating tube 22 is also reduced. The pressure detector 25 transmits an electrical signal to the first solenoid valve 3, and the first solenoid valve 3 opens. The gas in the regulating airbag 23 enters the pressure chamber 12 through the gas delivery pipe 24, and then enters the first solenoid valve 3 through the pressure chamber 12, and then flows out through the first solenoid valve 3, thereby causing the regulating airbag 23 to deflate smaller, resulting in a larger cross-sectional area for liquid flow in the regulating hole 221, thereby increasing the flow of liquid from the bottom of the regulating tube 22 into the top of the regulating tube 22. The flow above the regulating tube 22 is increased, thereby increasing the pressure above the regulating tube 22, until the pressure above the regulating tube 22 is increased to a safe range, and the first solenoid valve 3 is closed to stop gas discharge.

[0043] like Figure 2-Figure 5 As shown, the pressure detector 25 includes a detection plate 251, a detection rod 252 and a magnet 253. A sealing ring 111 is sleeved on the outside of the pressure detector 25. The detection rod 252 is fastened to the detection plate 251, and the end of the detection rod 252 away from the detection plate 251 is fastened to the magnet 253.

[0044] The detection plate 251 serves as the main force-bearing plate, and pressure is provided to the detection plate 251 through the flow of liquid. When the pressure provided by the liquid increases, the detection plate 251 starts to move toward the detection magnet 253, thereby driving the detection rod 252 to move. The movement of the detection rod 252 causes the magnet 253 to move. When the pressure provided by the liquid decreases, the detection plate 251 starts to move away from the magnet 253, thereby driving the detection rod 252 to move. The movement of the detection rod 252 causes the magnet 253 to move.

[0045] like Figure 2-Figure 5As shown, the pressure detector 25 also includes an electromagnetic coil 254, a coil mounting body 255 and a reset spring 256. The coil mounting body 255 is firmly connected to the detection mounting cavity 11, the electromagnetic coil 254 is connected to the coil mounting body 255, the reset spring 256 is firmly connected to the magnet 253, and the end of the reset spring 256 away from the magnet 253 is firmly connected to the coil mounting body 255.

[0046] When the pressure provided by the liquid increases, the detection plate 251 starts to move toward the detection magnet 253, thereby driving the magnet 253 to move. The movement of the magnet 253 causes the magnetic field generated by the magnet 253 to be cut by the electromagnetic coil 254 in the coil installation body 255, resulting in a change in magnetic flux, thereby generating an induced current, thereby controlling the opening and closing of the regulating pump 21. When the pressure provided by the liquid decreases, the detection plate 251 starts to move away from the magnet 253 under the action of the reset spring 256, and finally drives the magnet 253 to move. The movement of the magnet 253 causes the magnetic field generated by the magnet 253 to be cut by the electromagnetic coil 254 in the coil installation body 255, resulting in a change in magnetic flux, thereby generating an induced current. The generated induced current is sent to the first solenoid valve 3 to control the opening of the first solenoid valve 3.

[0047] like Figure 4 and Figure 5 As shown, a coil mounting cavity 2551 and a spring mounting cavity 2552 are provided on the coil mounting body 255, the electromagnetic coil 254 is placed in the coil mounting cavity 2551, the electromagnetic coil 254 and the coil mounting cavity 2551 are firmly connected, the magnet 253 is placed in the spring mounting cavity 2552, the magnet 253 and the spring mounting cavity 2552 are slidably connected, the return spring 256 is placed in the spring mounting cavity 2552, and the return spring 256 is firmly connected to the spring mounting cavity 2552 at one end away from the magnet 253.

[0048] The coil installation cavity 2551 is used to install the electromagnetic coil 254, and also collects the magnetic flux changes generated by cutting the magnetic flux lines to output the current. The spring installation cavity 2552 is used to install the reset spring 256 and the magnet 253, and also provides a movement path for the magnet 253 to cut the magnetic flux lines, so that the electromagnetic coil 254 cuts the magnetic field generated by the magnet 253 to cause changes in the magnetic flux.

[0049] like Figure 4 , Figure 6 and Figure 7As shown, the pressure balancing device 4 includes a balancing box 41, a balancing pump 42, an input pipe 43, an output pipe 44, a connecting pipe 45 and a second solenoid valve 46. The balancing box 41 is connected to the input pipe 43, and the bottom end of the input pipe 43 is located one to three centimeters above the bottom surface of the inner part of the balancing box 41. The balancing box 41 is connected to the connecting pipe 45, and the connecting pipe 45 is connected to the oil pipe 1. The second solenoid valve 46 is arranged on the connecting pipe 45, and the second solenoid valve 46 and the connecting pipe 45 are tightly connected. The output end of the balancing pump 42 is tightly connected to the output pipe 44, and the output pipe 44 is connected to the oil pipe 1 located above the regulating pipe 22.

[0050] When the pressure below the regulating pipe 22 exceeds the detection range, the second solenoid valve 46 opens, and the liquid below the regulating pipe 22 flows into the balancing tank 41 to reduce the pressure below the regulating pipe 22. When the pressure below the regulating pipe 22 returns to the detection range, the second solenoid valve 46 closes. When the pressure gradually stabilizes, the balancing pump 42 opens to send the liquid in the balancing tank 41 from the input pipe 43 to the output pipe 44, and finally directly to the top of the regulating pipe 22 to discharge the liquid in the balancing tank 41. When the pressure below the regulating pipe 22 is lower than the detection range, the second solenoid valve 46 opens, and the liquid below the regulating pipe 22 flows into the balancing tank 41. At the same time, the balancing pump 42 opens to send the liquid flowing in from the bottom of the regulating pipe 22 to the top of the regulating pipe 22, thereby increasing the pressure above the regulating pipe 22.

[0051] Working principle of the present invention:

[0052] By arranging pressure detectors 25 on the upper and lower sides of the regulating tube 22 to detect the pressure in the tube, when the movement of the liquid generates pressure, pressure is applied to the detection plate 251. When the pressure provided by the liquid increases, the detection plate 251 starts to move toward the direction close to the magnet 253, thereby driving the detection rod 252 to move. The movement of the detection rod 252 causes the magnet 253 to move. The movement of the magnet 253 causes the magnetic field generated by the magnet 253 to be cut by the electromagnetic coil 254 in the coil installation body 255 to generate a change in magnetic flux, thereby generating an induced current, thereby controlling the start of the regulating pump 21. The regulating pump 21 starts to deliver gas to the pressure chamber 12, and the gas enters the regulating airbag 23 through the gas delivery pipe 24, and the regulating airbag 23 starts to inflate. The expansion becomes larger, resulting in a smaller cross-sectional area of ​​liquid flow in the regulating hole 221, thereby reducing the flow rate of liquid from the bottom of the regulating tube 22 into the top of the regulating tube 22. The flow rate above the regulating tube 22 is reduced, thereby reducing the pressure above the regulating tube 22, until the pressure above the regulating tube 22 is reduced to a safe range, and the regulating pump 21 stops delivering gas. When the pressure provided by the liquid decreases, the detection plate 251 begins to move away from the magnet 253 under the action of the reset spring 256, thereby driving the detection rod 252 to move. The movement of the detection rod 252 causes the magnet 253 to move. The movement of the magnet 253 causes the magnetic field generated by the magnet 253 to be cut by the electromagnetic coil 254 in the coil mounting body 255 to generate a change in magnetic flux , thereby generating an induced current, which is sent to the first solenoid valve 3. The first solenoid valve 3 is opened, and the gas in the regulating airbag 23 enters the pressure chamber 12 through the gas delivery pipe 24, and then enters the first solenoid valve 3 through the pressure chamber 12, and then flows out through the first solenoid valve 3, thereby causing the regulating airbag 23 to deflate smaller, resulting in a larger cross-sectional area for liquid flow in the regulating hole 221, thereby increasing the flow rate of liquid from the bottom of the regulating tube 22 to the top of the regulating tube 22. The flow rate above the regulating tube 22 is increased, thereby increasing the pressure above the regulating tube 22, until the pressure above the regulating tube 22 is increased to a safe range, the first solenoid valve 3 is closed, and the gas discharge is stopped. When the pressure below the regulating tube 22 exceeds the detection range, The second solenoid valve 46 is opened, and the liquid below the regulating pipe 22 flows into the balancing tank 41 to reduce the pressure below the regulating pipe 22. When the pressure below the regulating pipe 22 returns to the detection range, the second solenoid valve 46 is closed. When the pressure gradually stabilizes, the balancing pump 42 is opened to send the liquid in the balancing tank 41 from the input pipe 43 to the output pipe 44, and finally directly to the top of the regulating pipe 22 to discharge the liquid in the balancing tank 41. When the pressure below the regulating pipe 22 is lower than the detection range, the second solenoid valve 46 is opened, and the liquid below the regulating pipe 22 flows into the balancing tank 41. At the same time, the balancing pump 42 is opened to send the liquid flowing in from the bottom of the regulating pipe 22 to the top of the regulating pipe 22, thereby increasing the pressure above the regulating pipe 22.

[0053] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A wellhead device with pressure regulating function, characterized in that: The wellhead device comprises an oil pipe (1), a pressure regulating device (2), a first solenoid valve (3) and a pressure balancing device (4); the oil pipe (1) is connected to the pressure regulating device (2), the oil pipe (1) is connected to the first solenoid valve (3), the oil pipe (1) is connected to the pressure balancing device (4), the pressure regulating device (2) is connected to the first solenoid valve (3), and the pressure regulating device (2) is connected to the pressure balancing device (4).

2. A wellhead device with pressure regulating function according to claim 1, characterized in that: The oil pipe (1) is provided with a detection installation chamber (11) and a pressure chamber (12). There are two detection installation chambers (11). The detection installation chamber (11) is connected to the pressure regulating device (2). The pressure chamber (12) is an annular groove. The pressure chamber (12) is connected to the pressure regulating device (2). The pressure chamber (12) is connected to the input end pipeline of the first solenoid valve (3).

3. A wellhead device with pressure regulating function according to claim 2, characterized in that: A plurality of sealing rings (111) are provided on the detection installation cavity (11); the outer ring of the sealing ring (111) is tightly connected to the detection installation cavity (11), and the inner ring of the sealing ring (111) is in contact with the pressure regulating device (2).

4. A wellhead device with pressure regulating function according to claim 2, characterized in that: The pressure regulating device (2) comprises a regulating pump (21), a regulating pipe (22), a regulating airbag (23), a gas delivery pipe (24) and a pressure detector (25); the output end of the regulating pump (21) is connected to a pressure chamber (12) pipeline, the input end of the regulating pump (21) is connected to the atmosphere, the regulating pipe (22) is tightly connected to the inner wall of the oil pipe (1), the regulating pipe (22) is provided with a plurality of regulating holes (221), the regulating airbag (23) is placed in the regulating hole (221), the regulating airbag (23) and the gas delivery pipe (24) are connected The gas delivery pipe (24) and the pressure chamber (12) are in communication, the gas delivery pipe (24) and the pressure chamber (12) are tightly connected, the pressure detector (25) is placed in the detection installation chamber (11), the pressure detector (25) and the detection installation chamber (11) are tightly connected, there are two pressure detectors (25), the two pressure detectors (25) are distributed at the upper and lower sides of the regulating pipe (22), the pressure detector (25) and the regulating pump (21) are electrically connected, and the pressure detector (25) and the first solenoid valve (3) are electrically connected.

5. A wellhead device with pressure regulating function according to claim 4, characterized in that: The pressure detector (25) comprises a detection plate (251), a detection rod (252) and a magnet (253); a sealing ring (111) is sleeved on the outer side of the pressure detector (25); the detection rod (252) and the detection plate (251) are tightly connected; and one end of the detection rod (252) away from the detection plate (251) is tightly connected to the magnet (253).

6. A wellhead device with pressure regulating function according to claim 5, characterized in that: The pressure detector (25) further comprises an electromagnetic coil (254), a coil mounting body (255) and a reset spring (256); the coil mounting body (255) is fixedly connected to the detection mounting cavity (11); the electromagnetic coil (254) is connected to the coil mounting body (255); the reset spring (256) is fixedly connected to the magnet (253); and the reset spring (256) is fixedly connected to the coil mounting body (255) at one end away from the magnet (253).

7. A wellhead device with pressure regulating function according to claim 6, characterized in that: The coil mounting body (255) is provided with a coil mounting cavity (2551) and a spring mounting cavity (2552); the electromagnetic coil (254) is placed in the coil mounting cavity (2551); the electromagnetic coil (254) and the coil mounting cavity (2551) are tightly connected; the magnet (253) is placed in the spring mounting cavity (2552); the magnet (253) and the spring mounting cavity (2552) are slidably connected; the return spring (256) is placed in the spring mounting cavity (2552); the end of the return spring (256) away from the magnet (253) is tightly connected to the spring mounting cavity (2552).

8. The wellhead device with pressure regulating function according to claim 4, characterized in that: The pressure balancing device (4) comprises a balancing box (41), a balancing pump (42), an input pipe (43), an output pipe (44), a connecting pipe (45) and a second electromagnetic valve (46); the balancing box (41) is connected to the input pipe (43); the bottom end of the input pipe (43) is located one to three centimeters above the bottom surface of the balancing box (41); the balancing box (41) is connected to the connecting pipe (45); the connecting pipe (45) is connected to the oil pipe (1); a second electromagnetic valve (46) is arranged on the connecting pipe (45); the second electromagnetic valve (46) and the connecting pipe (45) are tightly connected; the output end of the balancing pump (42) is tightly connected to the output pipe (44); the output pipe (44) is connected to the oil pipe (1) located above the regulating pipe (22).

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