A simple fracturing wellhead device

Abstract

The present invention relates to the field of oil production equipment, and more specifically, to a simple fracturing wellhead device, including: a sealing coupling, a locking nut and a separation tee; one end of the sealing coupling is sealed and fitted in the first interface of the separation tee, the sealing coupling is fitted and connected to one end of the locking nut, and the other end of the locking nut is threaded and sealed and connected to the first interface of the separation tee, so that the sealing coupling and the first interface of the separation tee are relatively sealed and connected. In the present invention, the sealing coupling is connected to the separation tee through the locking nut, replacing the bolt-type connection, and can be quickly installed through threads, which can effectively save labor; a conical pressure surface is provided on the conical sealing pressure ring of the sealing coupling, and the conical pressure surface can be sealed and fitted on the conical pressure-bearing surface at the first interface of the separation tee, and through the thread pre-tightening force of the locking nut, a high-pressure seal is forced to be formed between the sealing coupling and the separation tee, thereby improving the sealing effect and ensuring stability during fracturing.

Description

Technical Field

[0001] The invention relates to the field of oil production equipment, and more particularly to a simple fracturing wellhead device. Background Art

[0002] In recent years, the proportion of low-permeability reserves in proven oil and gas reserves has increased year by year. Low-permeability oil and gas reservoirs have low permeability and porosity and strong heterogeneity. Most oil and gas wells must implement fracturing production-increasing technical measures before they can achieve production capacity. The role of fracturing production-increasing technology in the development of low-permeability oil and gas reservoirs is becoming increasingly obvious. Fracturing refers to a method of using hydraulic force to form cracks in oil and gas layers during oil or gas production.

[0003] The fracturing process of oil and gas layers uses a fracturing truck to squeeze a high-pressure, large-volume, and viscous liquid into the oil layer. After many cracks are formed in the oil layer, proppants (such as quartz sand, etc.) are added to fill the cracks to improve the permeability of the oil and gas layer, thereby increasing the amount of water injection (water injection wells) or oil production (oil wells). In order to achieve the expected fracturing effect, the sealing requirements of the fracturing wellhead equipment are relatively high. In the prior art, the early fracturing wellhead devices were all connected by bolts, and a large amount of manpower was required to knock the bolts on site to ensure the sealing of the product. This connection structure is not only inconvenient to operate, but also consumes a lot of manpower. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a simple fracturing wellhead device.

[0005] The simple fracturing wellhead device of the present invention adopts the following technical solution:

[0006] A simple fracturing wellhead device comprises: a sealing coupling, a locking nut and a separation tee; one end of the sealing coupling is sealingly fitted in a first interface of the separation tee, the sealing coupling is fitted and connected to one end of the locking nut, and the other end of the locking nut is threadedly and sealingly connected to the first interface of the separation tee, so that the sealing coupling and the first interface of the separation tee are relatively sealed and connected.

[0007] Furthermore, a conical sealing pressure ring is provided on the sealing coupling, and a conical pressure surface of the conical sealing pressure ring is sealingly attached to a conical pressure-bearing surface at the first interface of the separation tee.

[0008] Furthermore, the outer side surface of the sealing coupling body inserted into the first interface is provided with more than one first annular sealing groove, and a first O-ring is fitted and connected in each first annular sealing groove.

[0009] Furthermore, the conical pressure surface of the conical sealing pressure ring is provided with more than one second annular sealing groove, each second annular sealing groove is fitted with a second O-ring, and the outer side of the second O-ring presses on the conical pressure-bearing surface of the first interface.

[0010] Furthermore, the tapered angle of the tapered pressure surface of the tapered sealing pressure ring is 24 degrees.

[0011] Furthermore, the middle of the internal chamber of the sealing coupling is a circular ring inner wall, and both ends of the internal chamber of the sealing coupling are conical ring inner walls, and the two conical ring inner walls are relatively arranged on both sides of the circular ring inner wall; the inner diameter of the conical ring inner wall gradually increases from the connecting end with the circular ring inner wall to the end away from the circular ring inner wall.

[0012] Furthermore, the separation tee comprises a main pipe provided with a first interface and a short section connected to a side of the main pipe.

[0013] Furthermore, the short section is a double male short section.

[0014] Furthermore, the locking nut includes a clamping ring, a locking ring coaxially fixedly connected to the clamping ring, and a locking torque arm fixedly connected to the outer ring surface of the clamping ring; the clamping ring seal slides on the outer side of the sealing coupling, the side surface of the clamping ring in contact with the locking ring is clamped on the plane structure of the conical sealing pressure ring away from the first interface, and the locking ring is threadedly sealed and connected to the first interface.

[0015] Furthermore, a tensioning mechanism is installed in the annular chamber formed between the outer side surface of the conical sealing pressure ring, the locking ring, the clamping ring and the separation tee, and the tensioning mechanism is sleeved on the outside of the conical sealing pressure ring to generate tensioning top pressure on the clamping ring and the separation tee.

[0016] The beneficial effects of the present invention are:

[0017] In a simple fracturing wellhead device of the present invention, a sealing coupling is connected to a separation tee through a locking nut, which replaces a bolted connection and is quickly installed through threads, which can effectively save labor; a conical pressure surface is provided on the conical sealing pressure ring of the sealing coupling, and the conical pressure surface can be sealed and fitted on the conical pressure-bearing surface at the first interface of the separation tee, and a high-pressure seal is forced to be formed between the sealing coupling and the separation tee through the thread pre-tightening force of the locking nut, thereby improving the sealing effect and ensuring stability during fracturing.

[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 accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 A schematic diagram of a simple fracturing wellhead device provided by an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of a sealing coupling provided by an embodiment of the present invention;

[0022] Figure 3 Schematic diagram of a locking nut provided in an embodiment of the present invention Figure 1 ;

[0023] Figure 4 Schematic diagram of a locking nut provided in an embodiment of the present invention Figure 2 ;

[0024] Figure 5 Schematic diagram of a separation tee provided in an embodiment of the present invention Figure 1 ;

[0025] Figure 6 Schematic diagram of a separation tee provided in an embodiment of the present invention Figure 2 ;

[0026] Figure 7 Schematic diagram of the first short section provided in the embodiment of the present invention Figure 1 ;

[0027] Figure 8 Schematic diagram of the first short section provided in the embodiment of the present invention Figure 2 ;

[0028] Fig. 9 A schematic diagram of a second short section provided in an embodiment of the present invention;

[0029] Fig.10 A schematic diagram of a main controller provided by an embodiment of the present invention;

[0030] Fig.11 A schematic diagram of a local structure provided by an embodiment of the present invention;

[0031] Fig.12 Schematic diagram of a first annular airbag, a second annular airbag and a third annular airbag provided in an embodiment of the present invention.

[0032] Icons: Sealing coupling 1; conical sealing pressure ring 101; first annular sealing groove 102; second annular sealing groove 103; circular ring inner wall 104; conical ring inner wall 105; first O-ring 2; second O-ring 3; locking nut 4; snap ring 401; locking ring 402; locking torque arm 403; separation tee 5; main pipe 501; short section 502; first circular airbag 6; second circular airbag 7; third circular airbag 8. DETAILED DESCRIPTION

[0033] In order to clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention, it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all 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.

[0034] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0035] See also Figure 1-12 The present invention provides a simple fracturing wellhead device, comprising: a sealing collar 1, a locking nut 4 and a separation tee 5; one end of the sealing collar 1 is sealed and fitted in the first interface of the separation tee 5, the sealing collar 1 is fitted and connected to one end of the locking nut 4, and the other end of the locking nut 4 is threaded and sealed and connected to the first interface of the separation tee 5, so that the sealing collar 1 and the first interface of the separation tee 5 are relatively sealed and connected. The sealing collar 1 is provided with a conical sealing pressure ring 101, and the conical pressure surface of the conical sealing pressure ring 101 is sealed and fitted on the conical pressure-bearing surface at the first interface of the separation tee 5.

[0036] A simple fracturing wellhead device of the present invention can effectively solve the time-consuming and labor-consuming problem of bolt connection of the early fracturing wellhead device in the prior art. During installation, the present invention first inserts the sealing coupling 1 into the first interface of the separation tee 5, then sleeves the locking nut 4 on the sealing coupling 1, and connects the locking nut 4 to the outer side of the first interface of the separation tee 5. By screwing the locking nut 4, the sealing coupling 1 is locked and connected to the separation tee 5. The fast installation through threads can effectively save labor. A conical pressure surface is provided on the conical sealing pressure ring 101 of the sealing coupling 1. The conical pressure surface can be sealed and fitted on the conical pressure-bearing surface at the first interface of the separation tee 5. The thread pre-tightening force of the locking nut 4 forces a high-pressure seal to be formed between the sealing coupling 1 and the separation tee 5, thereby improving the sealing effect and ensuring stability during fracturing.

[0037] The outer side surface of the hoop body of the sealing hoop 1 inserted into the first interface is provided with one or more first annular sealing grooves 102, and a first O-ring 2 is connected in each first annular sealing groove 102. The provision of the first O-ring 2 effectively improves the sealing effect between the hoop body and the first interface when the sealing hoop 1 is inserted into the first interface, thereby reducing the probability of leakage.

[0038] The conical pressure surface of the conical sealing pressure ring 101 is provided with more than one second annular sealing groove 103, and each second annular sealing groove 103 is connected with a second O-ring 3, and the outer side of the second O-ring 3 is pressed on the conical pressure surface of the first interface; through the arrangement of the second O-ring 3, the sealing effect between the conical pressure surface of the conical sealing pressure ring 101 and the conical pressure surface of the first interface is effectively improved, and the sealing stability is ensured, and the second O-ring 3 can play a certain elastic tensioning effect, thereby improving the stability of the sealing coupling 1 connected to the separation tee 5 through the locking nut 4.

[0039] The tapered pressing surface of the tapered sealing pressing ring 101 has a taper angle of 24 degrees.

[0040] The middle of the internal chamber of the sealing coupling 1 is a circular ring-shaped inner wall 104, and both ends of the internal chamber of the sealing coupling 1 are conical ring-shaped inner walls 105, and the two conical ring-shaped inner walls 105 are relatively arranged on both sides of the circular ring-shaped inner wall 104; the inner diameter of the conical ring-shaped inner wall 105 gradually increases from the connection end with the circular ring-shaped inner wall 104 to the end away from the circular ring-shaped inner wall 104.

[0041] Both ends of the internal chamber of the sealing coupling 1 are conical annular inner walls 105. When the pressure liquid enters the conical annular inner wall 105 of the sealing coupling far away from the first interface, the conical annular inner wall 105 can play a certain flow gathering effect. When the pressure liquid is output through the other conical annular inner wall 105 at the connection end of the sealing coupling 1 and the first interface, the pressure liquid can be expanded and discharged, and pressure can be generated on the conical pressure surface of the conical sealing pressure ring 101 and the conical pressure-bearing surface of the first interface, thereby improving the sealing effect. When fracturing the wellhead, two conical annular inner walls 105 are used to process the pressure liquid, one for flow gathering introduction and the other for expansion and discharge. The first conical annular inner wall 105 can effectively gather the pressure liquid, so that it forms a high-speed concentrated flow into the wellhead, thereby ensuring the pressure. The fracturing fluid is injected into the target formation as evenly as possible; the second conical annular inner wall 105 can expand the pressure fluid and guide it out, further enhancing the fracturing effect and ensuring that the liquid can effectively cover and penetrate into a wider range of formations; the design of the two conical annular inner walls 105 can optimize the transmission characteristics of the pressure fluid in the pipeline or device, reduce the energy loss of the fluid during the transportation process, help maintain the efficient transportation state of the liquid, ensure the stability and continuity of the fracturing operation, effectively reduce the pressure loss of the fluid when passing through the device, and also help to enhance the control ability of the fluid flow, help to accurately adjust the injection rate and position of the pressure fluid during the fracturing operation, maximize the effect of the fracturing operation, improve the efficiency and effect of the fracturing operation, and optimize the transmission and control of the fluid.

[0042] The separation tee 5 includes a main pipe 501 provided with a first interface and a short section 502 welded to the side of the main pipe 501 . The main pipe 501 and the short section 502 may also be an integrated structure.

[0043] The short section 502 is a double male short section, which is convenient for connection with other pipelines.

[0044] The locking nut 4 includes a clamping ring 401, a locking ring 402 coaxially fixedly connected to the clamping ring 401, and a locking torque arm 403 fixedly connected to the outer ring surface of the clamping ring 401; the clamping ring 401 sealingly slides on the outer surface of the sealing coupling 1, and the side surface of the clamping ring 401 in contact with the locking ring 402 is clamped on the plane structure of the conical sealing pressure ring 101 away from the first interface, and the locking ring 402 is threadedly sealed and connected to the first interface.

[0045] The structural setting of the locking nut 4 makes it easy to connect with the first interface of the separation tee 5, and also facilitates the clamping and limiting of the sealing coupling 1. When in use, the locking nut 4 is sleeved on the outer surface of the sealing coupling 1, and the side surface on which the clamping ring 401 contacts the locking ring 402 is clamped on the plane structure of the conical sealing pressure ring 101 away from the first interface, and then the locking ring 402 is controlled to be connected with the first interface, and the clamping ring 401 and the locking ring 402 are driven to rotate by rotating the locking torque arm 403, so that the locking ring 402 is threadedly connected to the threaded structure on the outer side of the first interface.

[0046] A tensioning mechanism is installed in the annular chamber formed between the outer side surface of the conical sealing pressure ring 101, the locking ring 402, the clamping ring 401 and the separation tee 5. The tensioning mechanism is sleeved on the outside of the conical sealing pressure ring 101 to generate tensioning top pressure on the clamping ring 401 and the separation tee 5.

[0047] The tensioning mechanism includes a first annular airbag 6, which is sleeved on the outside of the conical sealing pressure ring 101 and is located in the annular chamber. The inflation port of the first annular airbag 6 is connected to one end of an inflation tube with a valve, and the middle part of the inflation tube is passed through the through-tube hole on the clamping ring 401. The other end of the inflation tube that passes through the outside of the locking nut 4 can be connected to an air pump or a liquid pump, so as to inject gas or liquid into the first annular airbag 6. The first annular airbag 6 can be a silicone airbag. Since silicone has good softness and deformation ability, the first annular airbag 6 in the present invention can be effectively filled in the annular chamber after being filled with gas or liquid, adapting to the irregular gap position in the annular chamber, effectively ensuring the tensioning effect, and making the clamping ring The threaded connection structure of the connecting ring 401 and the separation tee 5 is relatively stable and has good stability. The clamping ring 401 will not easily loosen and separate from the separation tee 5, thereby ensuring the connection effect and stability during operation. It also has excellent high temperature resistance and chemical stability and is suitable for use under various environmental conditions. In addition, after the first annular airbag 6 is inflated, the air in the annular chamber will be squeezed out and sealed on the inner side of the through-tube hole on the clamping ring 401 to form a sealing structure to prevent outside air or liquid from entering the annular chamber, thereby reducing the probability of erosion or corrosion at the connection between the sealing coupling 1, the locking nut 4 and the separation tee 5 when the present invention is used, which is beneficial to ensuring the stability of the connection between the sealing coupling 1, the locking nut 4 and the separation tee 5.

[0048] The upper and lower surfaces of the first annular airbag 6 are also glued with annular anti-skid pads, and the annular anti-skid pads are provided with anti-skid patterns. When the first annular airbag 6 is inflated, the annular anti-skid pads on the upper and lower surfaces can effectively fit the lower surface of the clamping ring 401 and the upper surface of the first interface in the annular chamber, thereby generating friction resistance, improving the tensioning effect, and reducing the probability of loosening between the first interface and the locking ring 402.

[0049] A pressure sensor is also provided inside the first annular airbag 6 for monitoring the real-time pressure inside the first annular airbag 6. When the first annular airbag 6 is inflated, the pressure inside the first annular airbag 6 is in a relatively fixed state. When the first annular airbag 6 leaks, the gas originally inside the first annular airbag 6 begins to leak out, causing the pressure inside the first annular airbag 6 to gradually decrease. The pressure sensor inside the first annular airbag 6 can detect the gradual decrease in the pressure inside the first annular airbag 6, which is then transmitted to the upper computer controller. The controller controls the alarm device to issue a first alarm prompt message, indicating that the first annular airbag 6 may have a leakage problem, so as to facilitate timely inspection and maintenance to ensure the connection stability of the sealing coupling 1, the locking nut 4 and the separation tee 5.

[0050] When the pressure liquid leaks, since the pressure liquid flows between the sealing collar 1 and the first interface of the separation tee 5, when leaking, the pressure liquid generally enters the annular chamber through the gap between the sealing collar 1 and the first interface of the separation tee 5. At this time, pressure will be generated on the bag body of the first annular airbag 6 blocking the gap between the sealing collar 1 and the first interface of the separation tee 5. When the pressure is relatively high, the first annular airbag 6 will be compressed and deformed, resulting in a decrease in the volume of the first annular airbag 6. At this time, due to the reduction in the airbag volume of the first annular airbag 6, the original gas in the first annular airbag 6 is squeezed, resulting in an increase in the pressure of the gas in the first annular airbag 6. The pressure sensor will detect the gradual increase in the pressure in the first annular airbag 6. The pressure sensor monitors this pressure change and outputs a signal reflecting the degree of pressure increase. The pressure sensor can transmit the pressure increase signal to the host computer controller to control The device controls the alarm device to issue a second alarm prompt information, indicating that leakage may occur between the sealing coupling 1 and the first interface of the separation tee 5, so as to facilitate timely inspection and maintenance to ensure the stability of the wellhead fracturing and the continuity and safety of the fracturing construction; in addition, when the capsule body of the first annular airbag 6 blocking the gap between the sealing coupling 1 and the first interface of the separation tee 5 is compressed, the first annular airbag 6 as a whole will be deformed to a certain extent, and the first annular airbag 6 will be compressed outward from the connection between the sealing coupling 1 and the first interface. At this time, the sealing effect of the first annular airbag 6 blocking the connection between the clamping ring 401 and the conical sealing pressure ring 101 can be improved, and the sealing effect of the first annular airbag 6 blocking the connection between the locking ring 402 and the first interface of the separation tee 5 can be improved, and the greater the leakage pressure, the better the sealing effect, so that the leakage of the pressure liquid is controlled in the local area of ​​the annular chamber, reducing the probability of safety accidents.

[0051] The simple fracturing wellhead device described herein also includes a second annular airbag 7, the inner side surface of the second annular airbag 7 can be bonded to the outer side surface of the sealing collar 1, and is sealed at the connection between the sealing collar 1 and the upper surface of the clamping ring 401. The second annular airbag 7 is connected to the first annular airbag 6 through a first pipeline with a first one-way valve. The first pipeline with the first one-way valve is set so that the gas in the first annular airbag 6 can flow into the second annular airbag 7 in a one-way manner. The first pipeline is sealed and fixed in the first pipeline hole of the clamping ring 401. When the leakage problem of the pressure liquid is more serious, the pressure generated on the first annular airbag 6 is relatively large, and when the preset pressure is reached, the pressure sensor When the device transmits the signal of increased pressure to the upper computer controller, the controller can control the first one-way valve of the first pipeline to open, so as to release the pressure in time and prevent the first annular airbag 6 from bursting. Moreover, as the gas in the first annular airbag 6 flows into the second annular airbag 7, the second annular airbag 7 can be further expanded. When the second annular airbag 7 expands and deforms to a large extent, it can also serve as a warning prompt, so that the staff can find the fault more intuitively. Moreover, when the second annular airbag 7 expands further, the sealing effect of the connection between the sealing coupling 1 and the upper surface of the clamping ring 401 can be improved, so as to prevent the leakage liquid from seeping out through the connection between the sealing coupling 1 and the upper surface of the clamping ring 401.

[0052] The described simple fracturing wellhead device also includes a third annular airbag 8. The inner side surface of the third annular airbag 8 can be bonded to the outer side surface of the first interface of the separation tee 5, and is sealed at the connection between the first interface and the locking ring 402. The third annular airbag 8 is connected to the first annular airbag 6 through a second pipeline with a second one-way valve. The second pipeline with the second one-way valve is set so that the gas in the first annular airbag 6 can flow unidirectionally into the third annular airbag 8. The second pipeline is sealed and fixed in the pipeline hole of the clamping ring 401. When the leakage problem of the pressure liquid is more serious, the pressure generated on the first annular airbag 6 is relatively large. When the preset pressure is reached, the pressure sensor transmits the pressure increase signal to the host computer. At the same time, the controller can control the second one-way valve of the second pipeline to open, so that the gas or liquid in the first annular airbag 6 enters the third annular airbag 8 through the second pipeline, which is convenient for timely pressure relief to prevent the first annular airbag 6 from bursting, and as the gas in the first annular airbag 6 flows into the third annular airbag 8, it can further expand the third annular airbag 8. When the third annular airbag 8 expands and deforms to a large extent, it can also serve as a warning prompt, allowing the staff to find faults more intuitively, and when the third annular airbag 8 further expands, it can improve the sealing effect of the connection between the first interface and the locking ring 402, and prevent leakage from seeping out through the connection between the first interface and the locking ring 402.

[0053] Among them, the opening pressure of the second one-way valve is greater than the opening pressure of the first one-way valve. Since the locking ring 402 and the first interface are connected by threaded sealing, the connection surface is larger, and the leakage probability there is lower than the leakage probability at the connection between the sealing coupling 1 and the upper surface of the clamping ring 401. Therefore, when the pressure reaches the first preset value, the controller first controls the first one-way valve to open, and then when the pressure rises to reach the second preset value, controls the second one-way valve to open to release pressure through the second annular airbag 7 and the third annular airbag 8, and controls the alarm device to send out an emergency alarm prompt information, so as to improve safety.

[0054] In the description of the present invention, it is to 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”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A simple fracturing wellhead device, characterized in that: include: A sealing coupling (1), a locking nut (4) and a separation tee (5); one end of the sealing coupling (1) is sealingly fitted in a first interface of the separation tee (5), the sealing coupling (1) is fitted and connected to one end of the locking nut (4), and the other end of the locking nut (4) is threadedly and sealingly connected to the first interface of the separation tee (5), so that the sealing coupling (1) and the first interface of the separation tee (5) are relatively sealed and connected; The sealing collar (1) is provided with a conical sealing pressure ring (101), and the conical pressure surface of the conical sealing pressure ring (101) is sealingly attached to the conical pressure-bearing surface at the first interface of the separation tee (5); The conical pressure surface of the conical sealing pressure ring (101) is provided with one or more second annular sealing grooves (103), each second annular sealing groove (103) is fitted with a second O-type sealing ring (3), and the outer side of the second O-type sealing ring (3) is pressed against the conical pressure-bearing surface of the first interface; The middle of the internal chamber of the sealing coupling (1) is a circular ring-shaped inner wall (104), and both ends of the internal chamber of the sealing coupling (1) are conical ring-shaped inner walls (105). The two conical ring-shaped inner walls (105) are arranged opposite to each other on both sides of the circular ring-shaped inner wall (104); the inner diameter of the conical ring-shaped inner wall (105) gradually increases from the end connected to the circular ring-shaped inner wall (104) to the end away from the circular ring-shaped inner wall (104); The locking nut (4) comprises a clamping ring (401), a locking ring (402) coaxially fixedly connected to the clamping ring (401), and a locking torque arm (403) fixedly connected to the outer ring surface of the clamping ring (401); the clamping ring (401) sealingly slides on the outer surface of the sealing collar (1), the side surface of the clamping ring (401) in contact with the locking ring (402) is clamped on the plane structure of the conical sealing pressure ring (101) away from the first interface, and the locking ring (402) is threadedly sealed and connected to the first interface; A tensioning mechanism is installed in the annular chamber formed between the outer side surface of the conical sealing pressure ring (101), the locking ring (402), the clamping ring (401) and the separation tee (5), and the tensioning mechanism is sleeved on the outer side of the conical sealing pressure ring (101) to generate tensioning top pressure on the clamping ring (401) and the separation tee (5); The tensioning mechanism comprises a first annular airbag (6), which is sleeved on the outside of the conical sealing pressure ring (101) and is located in the annular chamber. The inflation port of the first annular airbag (6) is connected to one end of an inflation tube with a valve, the middle of the inflation tube is passed through a tube hole on the clamping ring (401), and the other end of the inflation tube passes through the outside of the locking nut (4) and is connected to an air pump or a liquid pump, so that gas or liquid is injected into the first annular airbag (6) to make the inflation port of the first annular airbag (6) be filled with gas or liquid. After being filled with gas or liquid, the first annular airbag (6) is filled in the annular chamber and adapts to the irregular gap position in the annular chamber, so that the threaded connection structure between the clamping ring (401) and the separation tee (5) is stable, and the clamping ring (401) will not be easily loosened and separated from the separation tee (5). After the first annular airbag (6) is expanded, the air in the annular chamber is squeezed out and the airbag is sealed and attached to the inner side surface of the through-tube hole on the clamping ring (401), forming a sealing structure; The upper surface and the lower surface of the first annular airbag (6) are respectively glued with annular anti-skid pads, and the annular anti-skid pads are provided with anti-skid patterns. When the first annular airbag (6) is expanded, the annular anti-skid pads on the upper surface and the lower surface are attached to the lower surface of the clamping ring (401) and the upper surface of the first interface in the annular chamber, thereby generating friction resistance and reducing the probability of loosening between the first interface and the locking ring (402); A pressure sensor is also provided inside the first annular airbag (6) for monitoring the real-time pressure inside the first annular airbag (6). When the first annular airbag (6) is inflated, the pressure inside the first annular airbag (6) is in a relatively fixed state. When the first annular airbag (6) leaks, the gas originally inside the first annular airbag (6) begins to leak out, causing the pressure inside the first annular airbag (6) to gradually decrease. The pressure sensor inside the first annular airbag (6) can detect the gradual decrease in the pressure inside the first annular airbag (6), which is then transmitted to the upper computer controller. The controller controls the alarm device to issue a first alarm prompt message, indicating that the first annular airbag (6) has a leakage problem. When the pressure liquid leaks, since the pressure liquid flows between the sealing collar (1) and the first interface of the separation tee (5), the pressure liquid enters the annular chamber through the gap between the sealing collar (1) and the first interface of the separation tee (5), generating pressure on the bag body of the first annular airbag (6) blocking the gap between the sealing collar (1) and the first interface of the separation tee (5). When the pressure is high, the first annular airbag (6) is compressed and deformed, the volume of the first annular airbag (6) is reduced, the original gas in the first annular airbag (6) is squeezed, and the pressure of the gas in the first annular airbag (6) increases. The pressure sensor detects the gradual increase in the pressure in the first annular airbag (6). The pressure sensor monitors this pressure change and outputs a signal reflecting the degree of pressure increase. The pressure sensor can transmit the pressure increase signal to the upper position. A machine controller, wherein the controller controls the alarm device to issue a second alarm prompt message, prompting that a leakage problem may occur between the sealing collar (1) and the first interface of the separation tee (5); when the first annular airbag (6) seals the gap between the sealing collar (1) and the first interface of the separation tee (5) and is compressed, the first annular airbag (6) is deformed as a whole, and the first annular airbag (6) is compressed outward from the connection between the sealing collar (1) and the first interface, thereby improving the sealing effect of the first annular airbag (6) sealing the connection between the clamping ring (401) and the conical sealing pressure ring (101), and the sealing effect of the first annular airbag (6) sealing the connection between the locking ring (402) and the first interface of the separation tee (5). The greater the leakage pressure, the better the sealing effect, so that the leakage of the pressure liquid is controlled in a local area of ​​the annular chamber; The simple fracturing wellhead device further comprises a second annular airbag (7), the inner side surface of the second annular airbag (7) being bonded to the outer side surface of the sealing collar (1) and sealingly blocking the connection between the sealing collar (1) and the upper surface of the clamping ring (401), the second annular airbag (7) being connected to the first annular airbag (6) via a first pipeline with a first one-way valve, the gas in the first annular airbag (6) being able to flow into the second annular airbag (7) in a one-way manner, the first pipeline being sealed and fixed in the first pipeline hole of the clamping ring (401), and when the pressure generated by the pressure liquid on the first annular airbag (6) is relatively large and reaches a preset pressure, the pressure transmitter When the sensor transmits the pressure increase signal to the upper computer controller, the controller can control the first one-way valve of the first pipeline to open, release the pressure in time, and prevent the first annular airbag (6) from bursting. As the gas in the first annular airbag (6) flows into the second annular airbag (7), the second annular airbag (7) can be further expanded. When the second annular airbag (7) expands and deforms to a large extent, a warning prompt is given. When the second annular airbag (7) further expands, the sealing effect of the connection between the sealing collar (1) and the upper surface of the clamping ring (401) is improved, and leakage liquid is prevented from seeping out through the connection between the sealing collar (1) and the upper surface of the clamping ring (401). The simple fracturing wellhead device further comprises a third annular airbag (8), the inner side surface of the third annular airbag (8) can be bonded to the outer side surface of the first interface of the separation tee (5), and seals and blocks the connection between the first interface and the locking ring (402). The third annular airbag (8) is connected to the first annular airbag (6) through a second pipeline with a second one-way valve, so that the gas in the first annular airbag (6) can flow into the third annular airbag (8) in a one-way manner. The second pipeline is sealed and fixed in the pipeline hole of the clamping ring (401). When the pressure generated by the pressure liquid on the first annular airbag (6) is relatively large and reaches a preset pressure, the pressure sensor transmits a pressure increase signal to the upper computer controller. The controller can control the second one-way valve of the second pipeline to open, so that the gas or liquid in the first annular airbag (6) enters the third annular airbag (8) through the second pipeline, and the pressure is released to prevent the first annular airbag (6) from bursting. As the gas in the first annular airbag (6) flows into the third annular airbag (8), the third annular airbag (8) is further expanded. When the third annular airbag (8) expands and deforms to a large extent, a warning prompt is issued, so that the staff can find the fault more intuitively. When the third annular airbag (8) is further expanded, the sealing effect of the connection between the first interface and the locking ring (402) can be improved, so as to prevent the leakage liquid from seeping out through the connection between the first interface and the locking ring (402); The opening pressure of the second one-way valve is greater than the opening pressure of the first one-way valve. Since the locking ring (402) and the first interface are connected by threaded sealing, the connection surface is larger and the leakage probability at this location is lower than the leakage probability at the connection between the sealing collar (1) and the upper surface of the clamping ring (401). Therefore, when the pressure reaches a first preset value, the controller first controls the first one-way valve to open, and then, when the pressure rises to a second preset value, controls the second one-way valve to open to release pressure through the second annular airbag (7) and the third annular airbag (8), and controls the alarm device to issue an emergency alarm prompt message.

2. A simple fracturing wellhead device according to claim 1, characterized in that: The sealing coupling (1) is inserted into the first interface and has one or more first annular sealing grooves (102) provided on the outer side surface of the coupling body, wherein each first annular sealing groove (102) is matched and connected with a first O-type sealing ring (2).

3. A simple fracturing wellhead device according to claim 1, characterized in that: The tapered angle of the tapered pressure surface of the tapered sealing pressure ring (101) is 24 degrees.

4. The simplified fracturing wellhead device according to claim 1, characterized in that: The separation tee (5) comprises a main pipe (501) provided with a first interface and a short section (502) connected to the side of the main pipe (501).

5. The simplified fracturing wellhead device according to claim 4, characterized in that: The short joint (502) is a double male short joint.

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