Intelligent efficient fracturing gas production wellhead device and control system thereof

Abstract

The invention relates to the technical field of fracturing gas production wellhead devices, in particular to an intelligent and efficient fracturing gas production wellhead device and a control system thereof, and the intelligent and efficient fracturing gas production wellhead device comprises a tubing head and a BT sealing ring; an annular mounting groove is formed in the inner wall of the tubing head, a grease injection hole and an observation hole are further formed in the tubing head, the grease injection hole and the observation hole extend in the radial direction of the tubing head, and straight lines where the extending directions of the grease injection hole and the observation hole are located coincide and pass through the axis of the tubing head; the BT sealing ring is arranged in the annular mounting groove and is obliquely arranged relative to the vertical direction, the horizontal section of the BT sealing ring is in a circular ring shape, the inner circumferential face of the BT sealing ring is attached to the outer wall of the oil pipe, an injection molding groove consistent with the inclining direction of the BT sealing ring is formed in the outer circumferential face of the BT sealing ring, and therefore the injection molding groove is provided with a first end close to the lower portion and a second end close to the upper portion. The grease injection hole is communicated with the first end of the injection molding groove, the observation hole is communicated with the second end of the injection molding groove, and the sealing effect of the BT sealing ring can be guaranteed.

Description

Technical Field

[0001] This invention relates to the field of fracturing gas production wellhead equipment technology, and in particular to an intelligent and efficient fracturing gas production wellhead equipment and its control system. Background Technology

[0002] The fracturing gas wellhead device is a key piece of equipment used to achieve fracturing and gas production in the extraction of shale gas and other materials. It has functions such as suspension, pressure bearing, and transportation.

[0003] The tubing head is a core component of the fracturing and gas production wellhead assembly, primarily used to suspend the tubing string inside the well. For example, patent application CN117090531A discloses an integrated fracturing and gas production wellhead assembly, including a BT sealing ring, a grease injection valve, and a tubing head four-way connector. The lower flange of the tubing head four-way connector has a BT sealing groove machined on its inner side for placing the BT sealing ring and ensuring contact between the BT sealing ring and the casing. The grease injection valve is installed on the outer periphery of the lower flange of the tubing head four-way connector. Sealant is injected into the BT sealing groove through the grease injection valve, causing the BT sealing ring to tightly grip the outer wall of the casing, forming a sealing structure. The tubing head four-way connector typically has an observation hole for easy observation of whether the sealant has been injected sufficiently. If the sealant has been injected sufficiently, a pressure test is performed to determine the sealing effect of the sealing ring. Because current BT sealing rings are usually designed as standard O-rings, during the grease injection process, if air is not completely expelled from the BT sealing groove, the outflow of sealant can be observed. This can lead to inaccurate pressure tests of the BT sealing ring, thus affecting its sealing effect. Summary of the Invention

[0004] Therefore, it is necessary to provide an intelligent and efficient fracturing gas wellhead device and its control system to address the technical problem that the current BT sealing ring is prone to causing inaccurate pressure holding detection and affecting its sealing effect.

[0005] The above objectives are achieved through the following technical solutions: A smart and efficient fracturing gas production wellhead device includes a tubing head and a BT sealing ring. The axis of the tubing head extends vertically, and the lower end of the tubing head is coaxially connected to the tubing in the well. The inner wall of the tubing head is provided with an annular mounting groove. The tubing head is also provided with a grease injection hole and an observation hole. Both the grease injection hole and the observation hole extend radially along the tubing head, and the straight lines of their respective extension directions coincide and pass through the axis of the tubing head. The BT sealing ring is set in the annular mounting groove, which is inclined relative to the vertical direction. The horizontal cross-section of the BT sealing ring is annular. The inner circumferential surface of the BT sealing ring is in contact with the outer wall of the tubing. The outer circumferential surface of the BT sealing ring is provided with a molding groove consistent with its inclination direction. Thus, the molding groove has a lower first end and an upper second end. The grease injection hole is connected to the first end of the molding groove, and the observation hole is connected to the second end of the molding groove.

[0006] Furthermore, the inner circumferential surface of the BT sealing ring is a diamond-shaped mesh surface, which is formed by multiple diamond-shaped protrusions connected to each other through the edges. When the diamond-shaped mesh surface is in sealing contact with the outer wall of the oil pipe, a cavity can be formed inside the diamond-shaped protrusions.

[0007] Furthermore, the inclination direction of the annular mounting groove is consistent with the inclination direction of the BT sealing ring, and two retaining rings distributed vertically are provided on the outer circumferential surface of the BT sealing ring. The oil pipe head is provided with two annular grooves distributed vertically. The retaining rings correspond one-to-one with the annular grooves and are slidably disposed in the annular grooves.

[0008] Furthermore, the BT sealing ring has an upper end face and a lower end face arranged in parallel, and two retaining rings are an upper retaining ring and a lower retaining ring. The upper retaining ring is connected to the upper end face and is configured as a conical ring inclined downward relative to the upper end face. The lower retaining ring is connected to the lower end face and is configured as a conical ring inclined upward relative to the lower end face.

[0009] Furthermore, the wall of the annular mounting groove is provided with a partition ring, which is provided corresponding to the injection molding groove. Multiple air bladders are evenly distributed around the inner circumference of the partition ring. When the air bladder is squeezed, it can extend horizontally and contact the wall of the injection molding groove, thereby separating the sealant in the injection molding groove in the vertical direction.

[0010] Furthermore, the inner circumferential surface of the separating ring is provided with upper and lower air bladders, thereby dividing the injection molding groove into three parts in the vertical direction.

[0011] Furthermore, both the annular mounting groove and the BT sealing ring are provided in upper and lower parts.

[0012] Furthermore, both the grease injection hole and the observation hole are equipped with injection valves, which are used to inject sealing grease into the injection mold.

[0013] Furthermore, the lower end of the tubing head is provided with a mounting flange, and the tubing is provided with an outer sleeve. The outer sleeve is set tightly against the well wall of the oil well. The outer sleeve is provided with a tray, and the tray is detachably connected to the mounting flange. Multiple adjusting blocks are detachably installed inside the tubing head corresponding to the mounting flange. The adjusting blocks can move along the axial direction of the tubing head. Each adjusting block is fitted with a slip between itself and the outer circumference of the tubing. The adjusting block and the slip are engaged by a bevel. The axial movement of the adjusting block along the tubing head allows the slip to move radially along the tubing, thereby pressing the tubing together.

[0014] A smart and efficient fracturing gas production control system, applied to the aforementioned smart and efficient fracturing gas production wellhead device, includes: The status monitoring module includes a pressure sensor and a status monitor. The pressure sensor is located at the grease injection port and is used to collect pressure data in the injection tank in real time. The status monitor is located at the observation port and is used to detect the flow data at that location. The intelligent control module, electrically connected to the status monitoring module, is used to receive the pressure data and flow rate data. It internally stores standard pressure threshold parameters and flow rate threshold parameters under fracturing gas production conditions. The intelligent control module is configured to: compare and analyze real-time data with the built-in parameters, and generate control commands accordingly, including: generating a command to close the observation hole when the flow rate data is greater than the flow rate threshold; generating a grease replenishment command when the pressure data is lower than the standard pressure threshold; and generating a grease stop injection command and a pressure holding command when the pressure data reaches the standard pressure threshold. The execution module, electrically connected to the intelligent control module, includes a grease injection pump and a shut-off valve. The grease injection pump is connected to the grease injection port via a pipeline and is used to automatically adjust the injection pressure and flow rate of the sealing grease according to the grease replenishment command or the grease stop command. The shut-off valve is located on the observation hole and is used to automatically close the observation hole according to the observation hole closing command.

[0015] The beneficial effects of this invention are: The intelligent and efficient fracturing gas wellhead device and its control system provided by this invention have the following features: First, the grease injection hole is located at the lower part of the injection groove, and the observation hole is located at the upper part of the injection groove. When sealing grease is injected into the injection groove through the grease injection hole, the sealing grease will flow from bottom to top. After the sealing grease has completely expelled the air in the injection groove, the observation hole can observe the outflow of the sealing grease, thus avoiding the presence of air in the injection groove and ensuring accurate subsequent pressure holding tests of the BT sealing ring, thereby guaranteeing the sealing effect of the BT sealing ring.

[0016] Secondly, by designing the inner circumferential surface of the BT sealing ring as a diamond-shaped mesh, the diamond-shaped mesh surface makes sealing contact with the outer wall of the tubing, creating a cavity within the diamond-shaped protrusions. This cavity buffers the pressure on the tubing. If the tubing head is slightly tilted relative to the tubing during installation, the BT sealing ring will be subjected to excessive pressure locally, easily leading to permanent deformation and seal failure. The diamond-shaped mesh design provides the BT sealing ring with a certain amount of deformation space in the vertical direction, thereby reducing the degree of deformation and extending its service life. Furthermore, when the outer wall of the tubing has protrusions, depressions, or burrs, the cavities formed by the diamond-shaped protrusions can separate these protrusions, depressions, or burrs from other areas, preventing overall seal failure of the BT sealing ring.

[0017] Third, the inclination direction of the annular mounting groove is consistent with the inclination direction of the BT sealing ring, so that the contact surfaces of the annular mounting groove and the BT sealing ring are both inclined surfaces, which can increase the sealing area, disperse local leakage pressure, and help improve the sealing performance of the BT sealing ring.

[0018] Fourth, since the sealant will settle under its own gravity, by setting up an airbag, it can be extended horizontally and contact the wall of the injection molding tank when squeezed by the sealant, thereby separating the sealant in the injection molding tank in the vertical direction, which can reduce the sedimentation of the sealant, make the pressure distribution of the sealant on the BT sealing ring more uniform, and ensure the sealing effect of the BT sealing ring. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of an intelligent and efficient fracturing gas production wellhead device provided in an embodiment of the present invention; Figure 2 This is a cross-sectional structural schematic diagram of an intelligent and efficient fracturing gas production wellhead device provided in an embodiment of the present invention; Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle; Figure 4 for Figure 2 Enlarged view of the structure at point B in the middle; Figure 5 A schematic diagram of the BT sealing ring in an intelligent and efficient fracturing gas production wellhead device provided in an embodiment of the present invention. Figure 1 ; Figure 6 A schematic diagram of the BT sealing ring in an intelligent and efficient fracturing gas production wellhead device provided in an embodiment of the present invention. Figure 2 ; Figure 7 for Figure 4 Another schematic diagram of the state.

[0020] in: 100. Oil pipe head; 102. Mounting flange; 103. Tray; 104. Adjusting block; 105. Slip; 106. Grease injection hole; 107. Inspection hole; 108. Cavity; 109. Separator ring; 110. Airbag; 111. First bolt; 112. Second bolt; 113. Outer sleeve; 200. BT sealing ring; 201. Upper retaining ring; 202. Lower retaining ring; 203. Diamond mesh surface; 204. Injection groove; 300. Oil pipe. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0022] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] like Figures 1 to 7As shown, an embodiment of the present invention provides an intelligent and efficient fracturing gas wellhead device, including a tubing head 100 and a BT sealing ring 200; the axis of the tubing head 100 extends in the vertical direction, and the lower end of the tubing head 100 is coaxially connected to the tubing 300 in the oil well; the inner wall of the tubing head 100 is provided with an annular mounting groove; the tubing head 100 is also provided with a grease injection hole 106 and an observation hole 107; both the grease injection hole 106 and the observation hole 107 extend radially along the tubing head 100, and the straight lines of their respective extension directions overlap and pass through the tubing head. The axis of 100; the BT sealing ring 200 is set in the annular mounting groove, which is inclined relative to the vertical direction, and the horizontal cross section of the BT sealing ring 200 is annular. The inner circumferential surface of the BT sealing ring 200 is in contact with the outer wall of the oil pipe 300. The outer circumferential surface of the BT sealing ring 200 is provided with an injection groove 204 that is consistent with its inclination direction. Thus, the injection groove 204 has a lower first end and an upper second end. The grease injection hole 106 is connected to the first end of the injection groove 204, and the observation hole 107 is connected to the second end of the injection groove 204.

[0025] With the grease injection hole 106 positioned lower in the injection molding groove 204 and the observation hole 107 positioned higher in the injection molding groove 204, when sealant is injected into the injection molding groove 204 through the grease injection hole 106, the sealant will flow from bottom to top. Only after the sealant has completely expelled the air from the injection molding groove 204 can the flow of sealant be observed through the observation hole 107. This prevents air from remaining in the injection molding groove 204, ensuring accurate subsequent pressure testing of the BT sealing ring 200 and thus guaranteeing the sealing effect of the BT sealing ring 200.

[0026] Specifically, when the sealant flows from the injection hole 106 to the observation hole 107, it generates two flow paths. Since the flow paths are also inclined, the sealant flows at approximately the same speed under its own gravity, allowing it to reach the observation hole 107 simultaneously. Compared to the prior art where both flow paths are horizontal, the different flow speeds of the sealant in the two paths allow the observation hole 107 to observe the sealant earlier. This ensures that the sealant can only be observed after it has completely expelled the air from the injection molded groove 204, resulting in more accurate observation results.

[0027] Furthermore, the inner circumferential surface of the BT sealing ring 200 is a diamond-shaped mesh surface 203, which is formed by multiple diamond-shaped protrusions connected to each other through the edges. When the diamond-shaped mesh surface 203 is in sealing contact with the outer wall of the oil pipe 300, a cavity 108 can be formed inside the diamond-shaped protrusions.

[0028] By making the inner circumferential surface of the BT sealing ring 200 a diamond-shaped mesh surface 203, the diamond-shaped mesh surface 203 is made to seal and contact the outer wall of the oil pipe 300, thereby forming a cavity 108 inside the diamond-shaped protrusion. The cavity 108 can buffer the pressure on the oil pipe 300.

[0029] If the tubing head 300 is slightly tilted relative to the tubing 300 during installation, the BT sealing ring 200 will be subjected to excessive local pressure, which can easily lead to permanent deformation and seal failure. The design of the diamond-shaped mesh surface 203 allows the BT sealing ring 200 to have a certain deformation space in the vertical direction, thereby reducing the degree of deformation of the BT sealing ring 200 and extending its service life. In addition, when the outer wall of the tubing 300 has structures such as protrusions, depressions, or burrs, the cavities 108 formed by the diamond protrusions can separate the protrusions, depressions, or burrs from other areas, preventing the overall seal of the BT sealing ring 200 from failing.

[0030] Furthermore, the inclination direction of the annular mounting groove is consistent with the inclination direction of the BT sealing ring 200. The outer circumferential surface of the BT sealing ring 200 is also provided with two retaining rings distributed vertically. The oil pipe head 100 is provided with two annular grooves distributed vertically. The retaining rings correspond one-to-one with the annular grooves and are slidably disposed in the annular grooves.

[0031] In this way, the contact surfaces of the annular mounting groove and the BT sealing ring 200 are both inclined surfaces, which can increase the sealing area, disperse local leakage pressure, and improve the sealing performance of the BT sealing ring 200.

[0032] Furthermore, the BT sealing ring 200 has parallel upper and lower end faces, and two retaining rings, an upper retaining ring 201 and a lower retaining ring 202. The upper retaining ring 201 is connected to the upper end face and is configured as a conical ring inclined downwards relative to the upper end face. The lower retaining ring 202 is connected to the lower end face and is configured as a conical ring inclined upwards relative to the lower end face. This design prevents the BT sealing ring 200 from dislodging from the annular mounting groove, thus improving its sealing effect.

[0033] Furthermore, the groove wall of the annular mounting groove is provided with a partition ring 109, which is provided corresponding to the injection molding groove 204. The inner circumferential surface of the partition ring 109 is evenly distributed with multiple airbags 110 in the circumferential direction. When the airbags 110 are squeezed, they can extend in the horizontal direction and contact the groove wall of the injection molding groove 204, thereby separating the sealant in the injection molding groove 204 in the vertical direction.

[0034] Since the sealant will settle under its own gravity, the airbag 110 is designed to expand under the pressure of the sealant, thus separating the sealant in the injection groove 204 vertically. This reduces the sedimentation of the sealant and makes the pressure distribution of the sealant on the BT sealing ring 200 more uniform, ensuring the sealing effect of the BT sealing ring 200. In addition, reducing the sedimentation of the sealant also prevents the grease injection hole 106 from becoming blocked.

[0035] Furthermore, the inner circumferential surface of the separating ring 109 is provided with two layers of air bladders 110, which can divide the injection molding groove 204 into three parts in the vertical direction. This is more effective in reducing the deposition of sealant.

[0036] Furthermore, both the annular mounting groove and the BT sealing ring 200 are provided in upper and lower positions. This creates a double seal, improving the sealing effect.

[0037] Furthermore, both the grease injection port 106 and the observation port 107 are equipped with injection valves, which are used to inject sealing grease into the injection molding tank 204. The injection valves can discharge the gas in the injection molding tank 204. The injection valves are equipped with end caps, which can completely close the grease injection port 106 or the observation port 107 to prevent gas from entering or leaving, thereby facilitating pressure holding.

[0038] Furthermore, the lower end of the tubing head 100 is provided with a mounting flange 102, and the tubing 300 is provided with an outer sleeve 113. The outer sleeve 113 is set tightly against the well wall of the oil well. The outer sleeve 113 is provided with a tray 103, and the tray 103 is detachably connected to the mounting flange 102 by a first bolt 111. A plurality of adjusting blocks 104 are detachably installed on the tubing head 100 corresponding to the interior of the mounting flange 102. The adjusting blocks 104 can move along the axial direction of the tubing head 100. Each adjusting block 104 is inserted with a slip 105 between it and the outer circumferential surface of the tubing 300. The adjusting blocks 104 and the slips 105 are engaged by a bevel. The axial movement of the adjusting blocks 104 along the tubing head 100 causes the slips 105 to move radially along the tubing 300, thereby pressing the tubing 300.

[0039] The adjusting block 104 is connected to the mounting flange 102 by a second bolt 112, which extends axially along the oil pipe head 100. The adjusting block 104, in conjunction with the slip 105, allows the oil pipe 300 to be coaxially positioned within the outer sleeve 113. The slip 105 has a serrated surface on the side facing the inner wall of the oil pipe 300, which increases the friction between the slip 105 and the oil pipe 300.

[0040] A pressure sensor (not shown in the figure) is provided at the grease injection hole 106 to collect pressure data in the injection molding tank 204 in real time.

[0041] Based on the above embodiments, the usage principle and working process of the embodiments of the present invention are as follows: Connect the tubing head 100 to the tubing 300 and the outer sleeve 113, and install the BT sealing ring 200.

[0042] Start injection molding pressure test: Remove the injection valve on the observation hole 107 corresponding to one of the BT sealing rings 200, and open the end cap of the injection valve on the corresponding grease injection hole 106. Then inject the sealant into the injection groove 204 through the injection valve, so that the sealant flows from bottom to top to the observation hole 107. When sealant is observed flowing out of the observation hole 107, reinstall the injection valve on the observation hole 107 to close the observation hole 107. Pressure holding stage: Continue injecting sealing grease into the injection tank 204 to apply pressure, and detect the pressure value using a pressure sensor. At this point, if... Figure 7 As shown, the airbag 110 extends to separate the sealing grease in the injection molding tank 204 in the vertical direction; when the pressure value in the injection molding tank 204 reaches the set value, the pressure is maintained for 30 minutes and the pressure value is observed; the pressure change is judged based on the real-time pressure value data. If the pressure value is stable, it indicates that the sealing effect is good; if the pressure value drops, it indicates that there may be a sealing leakage problem, and the BT sealing ring 200 should be replaced.

[0043] Repeat the above process to perform injection molding, pressure testing, and pressure holding on another BT sealing ring 200.

[0044] This invention also provides an intelligent and efficient fracturing gas production control system, applied to the aforementioned intelligent and efficient fracturing gas production wellhead device, comprising: The status monitoring module includes a pressure sensor and a status monitor. The pressure sensor is located at the grease injection port 106 and is used to collect pressure data in the injection molding tank 204 in real time. The status monitor is located at the observation port 107 and is used to detect the flow data at that port. The intelligent control module, electrically connected to the status monitoring module, is used to receive the pressure data and flow rate data. It internally stores standard pressure threshold parameters and flow rate threshold parameters under fracturing gas production conditions. The intelligent control module is configured to: compare and analyze real-time data with the built-in parameters, and generate control commands accordingly, including: generating a command to close observation port 107 when the flow rate data is greater than the flow rate threshold; generating a grease replenishment command when the pressure data is lower than the standard pressure threshold; and generating a grease stop injection command and a pressure holding command when the pressure data reaches the standard pressure threshold. The execution module, electrically connected to the intelligent control module, includes a grease injection pump and a shut-off valve. The grease injection pump is connected to the grease injection port 106 via a pipeline and is used to automatically adjust the injection pressure and flow rate of the sealing grease according to the grease replenishment command or the grease stop command. The shut-off valve is located on the observation port 107 and is used to automatically close the observation port 107 according to the command to close the observation port 107.

[0045] Furthermore, the control system also includes a remote interaction module, which communicates bidirectionally with the intelligent control module. It can synchronously upload the real-time monitoring data, analysis results, and generated instructions collected by the intelligent control module to the remote monitoring platform. At the same time, it allows staff to send parameter adjustment instructions to the intelligent control module through the remote monitoring platform, thereby realizing remote intelligent control and real-time monitoring of the fracturing gas wellhead device.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A smart and efficient fracturing gas production wellhead device, characterized in that, include: The tubing head has an axis that extends vertically. The lower end of the tubing head is coaxially connected to the tubing in the well. The inner wall of the tubing head is provided with an annular mounting groove. The tubing head is also provided with a grease injection hole and an observation hole. The grease injection hole and the observation hole both extend radially along the tubing head, and the straight lines in which their respective extension directions coincide and pass through the axis of the tubing head. The BT sealing ring is disposed in an annular mounting groove and is inclined relative to the vertical direction. The horizontal cross-section of the BT sealing ring is annular. The inner circumferential surface of the BT sealing ring is in contact with the outer wall of the oil pipe. The outer circumferential surface of the BT sealing ring is provided with an injection groove that is consistent with its inclination direction. Thus, the injection groove has a lower first end and an upper second end. The grease injection hole is connected to the first end of the injection groove, and the observation hole is connected to the second end of the injection groove.

2. The intelligent and efficient fracturing gas wellhead device according to claim 1, characterized in that, The inner circumferential surface of the BT sealing ring is a diamond-shaped mesh surface, which is formed by multiple diamond-shaped protrusions connected to each other through the edges. When the diamond-shaped mesh surface is in sealing contact with the outer wall of the oil pipe, a cavity can be formed inside the diamond-shaped protrusions.

3. The intelligent and efficient fracturing gas wellhead device according to claim 2, characterized in that, The inclination direction of the annular mounting groove is consistent with the inclination direction of the BT sealing ring. The outer circumference of the BT sealing ring is also provided with two retaining rings distributed vertically. The oil pipe head is provided with two annular grooves distributed vertically. The retaining rings correspond one-to-one with the annular grooves and are slidably disposed in the annular grooves.

4. The intelligent and efficient fracturing gas production wellhead device according to claim 3, characterized in that, The BT sealing ring has an upper end face and a lower end face arranged in parallel. The two retaining rings are an upper retaining ring and a lower retaining ring. The upper retaining ring is connected to the upper end face and is set as a conical ring that is inclined downward relative to the upper end face. The lower retaining ring is connected to the lower end face and is set as a conical ring that is inclined upward relative to the lower end face.

5. The intelligent and efficient fracturing gas production wellhead device according to any one of claims 1 to 4, characterized in that, The annular mounting groove has a partition ring on its wall, which corresponds to the injection molding groove. The inner circumferential surface of the partition ring has multiple air bladders evenly distributed around it. When the air bladders are squeezed, they can extend horizontally and contact the groove wall of the injection molding groove, thereby separating the sealant in the injection molding groove in the vertical direction.

6. The intelligent and efficient fracturing gas wellhead device according to claim 5, characterized in that, The inner circumferential surface of the dividing ring is provided with two layers of air bladders, which can divide the injection molding groove into three parts in the vertical direction.

7. The intelligent and efficient fracturing gas production wellhead device according to claim 1, characterized in that, Both the annular mounting groove and the BT sealing ring have two parts, one at the top and one at the bottom.

8. The intelligent and efficient fracturing gas production wellhead device according to claim 1, characterized in that, Both the grease injection hole and the observation hole are equipped with injection valves, which are used to inject sealing grease into the injection tank.

9. The intelligent and efficient fracturing gas production wellhead device according to claim 1, characterized in that, The lower end of the tubing head is provided with a mounting flange, and the tubing is provided with an outer sleeve. The outer sleeve is set tightly against the well wall of the oil well. The outer sleeve is provided with a tray, and the tray is detachably connected to the mounting flange. Multiple adjusting blocks are detachably installed inside the tubing head corresponding to the mounting flange. The adjusting blocks can move along the axial direction of the tubing head. Each adjusting block is fitted with a slip between itself and the outer circumference of the tubing. The adjusting block and the slip are engaged by a bevel. The axial movement of the adjusting block along the tubing head allows the slip to move radially along the tubing, thereby pressing the tubing together.

10. An intelligent and efficient fracturing gas production control system, applied to the intelligent and efficient fracturing gas production wellhead device according to any one of claims 1 to 9, characterized in that, include: The status monitoring module includes a pressure sensor and a status monitor. The pressure sensor is located at the grease injection port and is used to collect pressure data in the injection tank in real time. The status monitor is installed at the observation hole to detect the flow data at that location; The intelligent control module is electrically connected to the status monitoring module and is used to receive the pressure data and flow data. It has pre-stored standard pressure threshold parameters and flow threshold parameters under fracturing gas production conditions. The intelligent control module is configured to: compare and analyze real-time data with built-in parameters, and generate control commands accordingly, including: generating a command to close the observation hole when the flow rate data is greater than the flow rate threshold; generating a grease replenishment command when the pressure data is lower than the standard pressure threshold; and generating a grease stop injection command and a pressure holding command when the pressure data reaches the standard pressure threshold. The execution module, electrically connected to the intelligent control module, includes a grease injection pump and a shut-off valve. The grease injection pump is connected to the grease injection port via a pipeline and is used to automatically adjust the injection pressure and flow rate of the sealing grease according to the grease replenishment command or the grease stop command. The shut-off valve is located on the observation hole and is used to automatically close the observation hole according to the observation hole closing command.

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