High-pressure-resistant drill rod and orifice sealing integrated device of drilling machine and implementation method

Abstract

The invention discloses a high-pressure-resistant drill rod and orifice sealing integrated device of a drilling machine and an implementation method, and belongs to the technical field of drilling machine orifice sealing. Comprising a wellhead supporting assembly, a wellhead sealing assembly is arranged at the upper end of the wellhead supporting assembly, and a reinforced sealing assembly is arranged at the upper end of the wellhead sealing assembly; the well mouth sealing assembly comprises a well lid, a sealing ring, a first sealing sleeve, a drill rod, an annular base and a second sealing sleeve. Multi-level dynamic sealing guarantee is provided through the well mouth sealing assembly, ultrahigh-pressure and high-temperature environments can be reliably coped with, the high-temperature-resistant rubber sealing ring is adopted between the well lid and the lining cylinder, self-adaptive deformation can be achieved when pressure rises so as to enhance the sealing effect, the first sealing sleeve at the penetrating position of the drill rod achieves sliding sealing through the smooth wall face, and the sealing effect is good. The second sealing sleeve on the lower portion of the micro anchor rod is in interference fit with the drill rod, the sealing materials are prevented from displacing or falling off under extreme pressure by means of the micro anchor rod and a bonding dual-fixing mode, and continuous sealing of the drill rod in dynamic operation is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of drilling rig orifice sealing technology, specifically to an integrated device and method for sealing high-pressure drill rods and orifices in drilling rigs. Background Technology

[0002] A drilling rig orifice seal is a sealing device installed at the orifice of the drilling rig during the drilling process to prevent high-pressure fluids (such as oil, gas, and water) from leaking out from the annular space between the drill pipe and the well wall. This sealing device effectively protects the environment, prevents pollution, and ensures the safety and efficiency of drilling operations. For example, invention patent CN211397529U discloses an orifice sealing device, relating to the field of mining tunnel exploration technology. The system includes a first sealing assembly and a second sealing assembly. The first sealing assembly includes a first sleeve, a rubber ring assembly, and a first nut. The outer wall of the first section of the first sleeve has a first protrusion, and the outer wall of the second section of the first sleeve has a first external thread. The rubber ring assembly is fitted onto the first sleeve, and the first nut is fitted onto the first external thread. The second sealing assembly includes a pipe joint, a second sleeve, a second nut, and a first rubber ring. The outer wall of the second sleeve has a second external thread, and the inner wall of the tail of the second nut has a second protrusion. The second nut is fitted onto the second external thread, and the first rubber ring is placed inside the cavity of the second nut. The first opening of the pipe joint is connected to the first sleeve, the second opening of the pipe joint is connected to the second sleeve, and the third opening of the pipe joint is connected to an external water pipe. This solves the problem in the prior art where geological drilling rigs cannot drill inclined holes to obtain rock cores.

[0003] Currently, the working principle of orifice sealing devices is mainly to achieve sealing through the elastic deformation of the sealing element. However, in most cases, the connection between the orifice and the drill pipe is sealed by a single sealing ring or sealing ring structure. Under continuous use, this can easily become loose and unstable. Furthermore, in ultra-high pressure jet operations, if there is no effective seal at the connection between the orifice and the drill pipe, high-pressure gas leakage may occur, which will not only reduce drilling efficiency but may also have an impact on the environment. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated device and method for sealing drill rods and orifices under high pressure for drilling rigs, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A high-pressure resistant drill pipe and wellhead sealing integrated device for drilling rigs includes a wellhead support component located in a rock layer and an injection mechanism for supercritical CO2 jet operations. The wellhead support component is provided with a wellhead sealing component at its upper end, and the wellhead sealing component is provided with a reinforced sealing component at its upper end.

[0007] The wellhead support assembly includes a wellhead body, a support frame, mounting plates, and an inner liner. The wellhead body is located inside the rock layer, and the support frame is located inside the wellhead body. Several mounting plates are distributed at the lower end of the support frame, and the mounting plates are fixedly installed to the inside of the wellhead body by fastening bolts. An inner liner is located inside the port of the wellhead body, and an adhesive layer is provided between the inner liner and the wellhead body. The outer wall of the inner liner is wrapped with an annular plate, and the lower end of the annular plate is fitted to the upper plane of the rock layer.

[0008] The wellhead sealing assembly includes a well cover, a sealing ring, a first sealing sleeve, a drill pipe, an annular seat, and a second sealing sleeve. The well cover is fixedly installed to the inner liner by a third fastening bolt. A sealing ring is wrapped inside the connection between the well cover and the inner liner. The first sealing sleeve is inserted through the center of the well cover. The drill pipe is inserted through the inside of the first sealing sleeve. An annular seat is provided at the lower end of the first sealing sleeve. The inside of the annular seat is inserted through the drill pipe. The second sealing sleeve is filled inside the annular seat.

[0009] The reinforced sealing assembly includes a reinforced sealing sleeve, a limiting sleeve, a limiting rod, and a dense arc-shaped seat; the reinforced sealing sleeve is fitted at the sliding connection position between the sealing sleeve and the upper end of the drill pipe; the limiting sleeve is symmetrically distributed on both sides at the upper end of the well cover; the limiting rod is slidably sleeved on the inner side of the limiting sleeve, and a dense arc-shaped seat is welded to one end of the limiting rod, and the dense arc-shaped seat is symmetrically wrapped around both sides of the reinforced sealing sleeve;

[0010] Furthermore, the outer ring wall of the support frame is slidably fitted to the inner wall of the wellhead body, and the mounting plates distributed at multiple points at the lower end of the support frame, together with fastening bolts, are used to stably install the support frame and the inner wall of the wellhead body. The support frame is used to support the inner liner above.

[0011] Furthermore, the adhesive layer is made of concrete and is used to bond and fill the gap between the inner liner and the wellhead body; the upper end of the inner liner penetrates the interior of the wellhead body and extends upward a certain distance, and several fastening bolts are distributed on the annular plate, and the annular plate is fixedly assembled with the rock layer by the fastening bolts.

[0012] Furthermore, the sealing ring is made of high-temperature resistant rubber material, and the outer wall of the sealing ring is fixed to the inner wall of the inner liner by screws. The upper end face of the sealing ring is pressed and fitted against the lower end face of the manhole cover.

[0013] Furthermore, both the sealing sleeve and the annular seat are made of stainless steel. The connection between the sealing sleeve and the well cover is fixed by welding. The inner ring wall of the sealing sleeve and the outer ring wall of the drill rod are both smooth surfaces. The two slide and fit together to form a sealed moving rod and stationary ring structure. Through the smooth and uneven sleeve contact, a dynamic sliding seal is formed.

[0014] Furthermore, the second sealing sleeve is made of high-temperature resistant rubber material, the surface of the drill rod penetrates the interior of the second sealing sleeve, and the second sealing sleeve and the drill rod are press-fitted together. The outer ring wall of the second sealing sleeve and the inner ring wall of the annular seat are bonded and fixed with high-temperature resistant resin adhesive at the connection point.

[0015] Furthermore, the interior of the sealing sleeve 2 is provided with several micro anchor rods, and the lower end of the annular seat is provided with several positioning plates. The position of any positioning plate corresponds to the position of the micro anchor rod. The surface of the positioning plate is provided with fastening bolts 4. The micro anchor rod has a threaded groove inside. The positioning plate is assembled with the threaded groove of the micro anchor rod through the fastening bolts 4.

[0016] Furthermore, the inner ring wall of the reinforced sealing sleeve and the outer ring wall of the sealing sleeve are bonded and fixed with resin adhesive, the inner ring wall of the reinforced sealing sleeve and the outer ring wall of the drill pipe are installed in close contact by interference fit, and the outer ring wall of the limiting sleeve is fixed to the upper end of the well cover by a bracket.

[0017] Furthermore, a bushing and a motor are respectively provided on the top of the manhole cover. A shaft is rotatably provided inside the bushing, and a drive shaft is provided inside the motor. The end of the shaft and the connection position of the shaft are fixedly connected by a coupling. External threads are symmetrically distributed at both ends of the shaft. A threaded sleeve is threadedly installed on the surface of the external threads on either side. A connecting rod is fixedly assembled on the outer ring wall of the threaded sleeve. The end of the connecting rod away from the threaded sleeve is fixedly assembled with a dense arc-shaped seat.

[0018] Furthermore, the gas injection mechanism is located inside the drill pipe. The gas injection mechanism includes an inlet connector, a female two-way valve, a bearing, a locking nut, a pressure ring, a packer sleeve, a sleeve spacer, an O-ring, a gas injection center tube, a gas injection fracturing tube, and a gas injection nozzle. The pressure ring is embedded and installed at the end of the drill pipe. The upper end of the pressure ring is fitted with a bearing via a locking nut. The inlet connector is interference-fitted and rotatably mounted inside the bearing. A female two-way valve is provided on the inlet connector. The lower end of the pressure ring is also fitted with a packer sleeve. A sleeve spacer and an O-ring are provided on the outer wall of the packer sleeve. The gas injection center tube is embedded inside the packer sleeve. The lower end of the gas injection center tube is fixedly connected to the gas injection fracturing tube. The end of the gas injection fracturing tube is provided with a gas injection nozzle.

[0019] This invention provides another technical solution: a method for implementing an integrated device for high-pressure resistant drill rods and borehole sealing in drilling rigs, comprising the following steps:

[0020] S1: The support frame is fixed to the inner wall of the wellhead body by multiple mounting plates and fastening bolts to form a basic support frame;

[0021] S2: Place the inner liner on the upper end of the support frame, fill the space between its outer wall and the inner wall of the wellhead body with a concrete bonding layer, then weld the annular plate to the upper end of the outer ring of the inner liner, and fix it to the surface of the rock layer by fastening bolts 2.

[0022] S3: Secure the manhole cover to the upper end of the inner liner using three fastening bolts, and install a high-temperature resistant rubber sealing ring on the inner side of the joint;

[0023] S4: Weld the sealing sleeve to the center of the well cover. Its smooth inner wall slides against the smooth outer wall of the drill pipe to form a dynamic sealing structure, which allows the drill pipe to move up and down while maintaining a seal.

[0024] S5: The sealing sleeve is nested inside the annular seat and press-fitted with the drill pipe, and then bonded with high-temperature resistant resin to form a one-time fixation.

[0025] S6: The miniature anchor rod is passed through the sealing sleeve and connected to the positioning plate by four threads of fastening bolts to form a secondary fixation;

[0026] S7: The reinforcing sealing sleeve is bonded to the outer wall of the sealing sleeve and the drill pipe is over-exposed to form an additional sealing layer. Then the limiting sleeve is fixed to the upper end of the well cover, and the limiting rod is slidably installed inside it. The end of the limiting rod is welded with a dense arc-shaped seat, which is symmetrically wrapped around both sides of the reinforcing sealing sleeve.

[0027] S8: The motor drives the external threads at both ends to rotate through the shaft, which in turn drives the threaded sleeve to move axially. This, in turn, pushes the dense arc-shaped seat towards the center through the connecting rod, compressing and strengthening the sealing sleeve, thus enhancing its tightness with the drill pipe.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. The integrated drilling rod and wellhead sealing device and implementation method of the present invention for high-pressure drilling rig achieves stable support and long-term protection of the wellhead through the wellhead support component. The inner liner is firmly fixed inside the wellhead by the support frame and the mounting plate. At the same time, the gap is filled by the concrete bonding layer, which enhances the overall structural stability and effectively prevents well wall collapse. The upper annular plate is fastened to the rock layer by bolts, which further resists the impact of internal high pressure and ensures the absolute safety and durability of the wellhead foundation during drilling operations.

[0030] 2. The integrated drilling rod and wellhead sealing device and implementation method of the present invention for high-pressure drill rigs provides multi-level dynamic sealing protection for the wellhead sealing component, which can reliably cope with ultra-high pressure and high temperature environments. The well cover and inner liner are equipped with a high-temperature resistant rubber sealing ring, which can adapt to deformation when the pressure increases to enhance the sealing effect. The sealing sleeve one at the drill rod penetration point achieves sliding sealing through the smooth wall surface, while the sealing sleeve two below it is interference-fitted with the drill rod and fixed by a dual method of micro anchors and adhesive bonding, which resolutely prevents the sealing material from shifting or falling off under extreme pressure, ensuring continuous sealing during the dynamic operation of the drill rod.

[0031] 3. The integrated drilling rod and borehole sealing device and implementation method of the present invention further improves the sealing reliability of key parts through the setting of reinforced sealing components, and has an adjustable clamping function. The reinforced sealing sleeve covers the joint between the drilling rod and the sealing sleeve, and the sealing is enhanced by interference fit. The dense arc-shaped seats on both sides are driven by a motor and can be tightened or loosened by a threaded transmission mechanism, thereby flexibly adjusting the clamping force on the reinforced sealing sleeve so that it can maintain the optimal sealing state under different working conditions.

[0032] 4. The integrated high-pressure drill rod and orifice sealing device and implementation method of the present invention, by setting an injection mechanism for injecting supercritical CO2 gas flow inside the drill rod, the injection mechanism includes an inlet connector, a female two-way connector, a bearing, a locking nut, a pressure ring, a sealing rubber sleeve, a rubber sleeve spacer, an O-ring, an injection center pipe, an injection fracturing pipe, and an injection nozzle. By integrating the injection mechanism inside the drill rod, the stability of supercritical CO2 gas flow injection operation is greatly improved. Attached Figure Description

[0033] Figure 1 This is a schematic cross-sectional view of the overall structure of the present invention;

[0034] Figure 2 This is an isometric view of the overall structure of the present invention;

[0035] Figure 3 This is a schematic diagram of the internal structure of the wellhead body of the present invention;

[0036] Figure 4 This is a schematic diagram of the cross-sectional distribution of the dense arc-shaped seat of the present invention;

[0037] Figure 5 For the present invention Figure 4 A magnified view of a portion of the image;

[0038] Figure 6 This is a top view schematic diagram showing the distribution and connection between the compact arc-shaped seat and the shaft of the present invention;

[0039] Figure 7 This is a schematic diagram of the air injection mechanism and drill pipe assembly of the present invention;

[0040] Figure 8 This is a schematic diagram of the gas injection mechanism of the present invention.

[0041] In the diagram: 1. Wellhead support assembly; 10. Rock layer; 11. Wellhead body; 12. Support frame; 13. Mounting plate; 14. Fastening bolt one; 15. Inner liner; 16. Adhesive layer; 17. Annular plate; 18. Fastening bolt two; 2. Wellhead sealing assembly; 20. Well cover; 21. Fastening bolt three; 22. Sealing ring; 23. Sealing sleeve one; 24. Drill pipe; 25. Annular seat; 26. Sealing sleeve two; 2001. Miniature anchor bolt; 2002. Positioning plate; 2003. Fastening bolt four; 3. Strong 30. Enclosed assembly; 31. Reinforced sealing sleeve; 32. Limiting sleeve; 33. Limiting rod; 34. Dense arc-shaped seat; 35. Bushing; 36. Shaft; 37. Motor; 38. External thread; 39. Threaded sleeve; 40. Connecting rod; 41. Gas injection mechanism; 42. Inlet connector; 43. Female two-way connector; 44. Bearing; 45. Locking nut; 46. Pressure ring; 47. Sealing rubber sleeve; 48. Rubber sleeve spacer; 49. O-ring; 40. Gas injection center tube; 40. Gas injection fracturing tube; 410. Gas injection nozzle. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Please see Figure 1-6 This invention provides a high-pressure resistant drill rod and wellhead sealing integrated device for drilling rigs, including a wellhead support component 1 located in a rock layer 10, a wellhead sealing component 2 provided at the upper end of the wellhead support component 1, and a reinforced sealing component 3 provided at the upper end of the wellhead sealing component 2.

[0044] Specifically, the wellhead support assembly 1 includes a wellhead body 11, a support frame 12, mounting plates 13, and an inner liner 15. The wellhead body 11 is provided inside the rock layer 10, and the support frame 12 is provided inside the wellhead body 11. The outer ring wall of the support frame 12 is slidably fitted against the inner wall of the wellhead body 11. Several mounting plates 13 are distributed at the lower end of the support frame 12. The upper end of any mounting plate 13 is welded and fixed to the surface of the support frame 12. Fastening bolts 14 are provided on the surface of the mounting plate 13. The mounting plate 13 is fixedly installed to the inside of the wellhead body 11 by fastening bolts 14. The multiple mounting plates 13, together with the fastening bolts 14, can stably install the support frame 12 to the inner wall of the wellhead body 11. The support frame 12 can support the inner liner 15 above.

[0045] In the above embodiment, an inner liner 15 is provided inside the port of the wellhead body 11. The lower end of the inner liner 15 is supported on the upper end of the support frame 12. The inner liner 15 can protect the interior of the wellhead body 11 from collapse. An adhesive layer 16 is provided between the inner liner 15 and the wellhead body 11. The adhesive layer 16 is made of concrete and can fill the gap between the inner liner 15 and the wellhead body 11, forming an adhesive effect. This ensures the stability of the installation between the inner liner 15 and the inner wall of the wellhead body 11. At the same time, it can also seal the gap between the outer wall of the inner liner 15 and the inner wall of the wellhead body 11. The upper end of the inner liner 15... Extending upwards a certain distance through the interior of the wellhead body 11, the outer wall of the inner liner 15 is also wrapped with an annular plate 17. The connection between the annular plate 17 and the inner liner 15 is fixed by welding. The lower end of the annular plate 17 is fitted to the upper plane of the rock layer 10. Several fastening bolts 18 are distributed on the annular plate 17. The annular plate 17 is fixedly assembled with the rock layer 10 by the fastening bolts 18. The combination of the annular plate 17 and the fastening bolts 18 can further ensure the stable installation of the inner liner 15 and the wellhead body 11, and can prevent the inner liner 15 from separating from the wellhead body 11 when the inside of the wellhead body 11 is under high pressure.

[0046] The wellhead sealing assembly 2 in this embodiment includes a well cover 20, a sealing ring 22, a first sealing sleeve 23, a drill pipe 24, an annular seat 25, and a second sealing sleeve 26. The upper end of the inner liner 15 is covered by the well cover 20. Several fastening bolts 21 are distributed on the surface of the well cover 20. The well cover 20 is fixedly installed to the inner liner 15 by the fastening bolts 21. The well cover 20 can cover and seal the inner liner 15, which is equivalent to sealing the wellhead body 11. A sealing ring 22 is wrapped inside the connection between the well cover 20 and the inner liner 15. The sealing ring 22 is made of high-temperature resistant rubber material. The outer wall of the sealing ring 22 is fixed to the inner wall of the inner liner 15 by screws. The upper end face of the sealing ring 22 is pressed and fitted against the lower end face of the well cover 20. When the internal pressure of the wellhead body 11 increases, the sealing ring 22 will deform and expand appropriately under the influence of high temperature and high pressure, thereby strengthening the seal at the connection between the well cover 20 and the inner liner 15.

[0047] In the above embodiment, a sealing sleeve 23 is provided through the center of the manhole cover 20. The connection between the sealing sleeve 23 and the manhole cover 20 is fixed by welding. A drill rod 24 is sleeved through the inside of the sealing sleeve 23. The inner wall of the sealing sleeve 23 and the outer wall of the drill rod 24 are both smooth surfaces. The two slide against each other, forming a moving rod and stationary ring structure similar to a conventional seal. Through the smooth and uneven sleeve contact, a dynamic sliding seal can be formed. An annular seat 25 is provided at the lower end of the sealing sleeve 23. Both the sealing sleeve 23 and the annular seat 25 are made of non-woven fabric. Made of stainless steel, the annular seat 25 is inserted through the drill rod 24. The connection between the annular seat 25 and the sealing sleeve 23 is fixed by welding. The annular seat 25 is filled with a sealing sleeve 26, which is made of high-temperature resistant rubber. The surface of the drill rod 24 penetrates the interior of the sealing sleeve 26, and the two are pressed together by interference fit. The outer ring wall of the sealing sleeve 26 and the inner ring wall of the annular seat 25 are bonded and fixed by high-temperature resistant resin adhesive. This can be used as the first fixation method for fixing the sealing sleeve 26 and the annular seat 25.

[0048] Furthermore, several miniature anchor rods 2001 are installed inside the sealing sleeve 26. The upper end of each miniature anchor rod 2001 has a wide head structure, and the lower end has a pointed structure. This shape allows for better passage through the sealing sleeve 26 and achieves an anti-detachment and penetration effect. Several positioning plates 2002 are distributed at the lower end of the annular seat 25. The position of any positioning plate 2002 corresponds to the position of the miniature anchor rod 2001. Fastening bolts 2003 are provided on the surface of the positioning plate 2002. The miniature anchor rod 2001 has a threaded groove inside for positioning. Plate 2002 is assembled with the threaded groove of micro anchor rod 2001 by fastening bolt four 2003. At this time, it can be used as a second fixing method for the installation of sealing sleeve two 26 and annular seat 25. When the pressure inside the wellhead body 11 is high, in order to prevent sealing sleeve two 26 from being pushed up along the drill pipe 24 and separating from annular seat 25, the bonding between sealing sleeve two 26 and annular seat 25 and the anchoring position of micro anchor rod 2001 can ensure the stability of the position of sealing sleeve two 26 and annular seat 25, thereby ensuring its continuous sealing effect.

[0049] The reinforced sealing component 3 in this embodiment of the invention includes a reinforced sealing sleeve 30, a limiting sleeve 31, a limiting rod 32, and a dense arc-shaped seat 33; the reinforced sealing sleeve 30 covers the upper sliding penetration connection position of the sealing sleeve 23 and the drill pipe 24. The inner ring wall of the reinforced sealing sleeve 30 and the outer ring wall of the sealing sleeve 23 are bonded and fixed with resin adhesive. The inner ring wall of the reinforced sealing sleeve 30 and the outer ring wall of the drill pipe 24 are installed in a tight fit with an interference fit, thereby further ensuring the sealing of the sealing sleeve 23 and the drill pipe 24 during the penetration process. The upper end of the well cover 20 is symmetrically distributed along both sides. The limiting sleeve 31 has its outer ring wall fixed to the upper end of the well cover 20 by a bracket. The inner side of the limiting sleeve 31 is slidably fitted with a limiting rod 32. One end of the limiting rod 32 is provided with a dense arc-shaped seat 33. The connection between the dense arc-shaped seat 33 and the limiting rod 32 is fixed by welding. The dense arc-shaped seats 33 are symmetrically wrapped around both sides of the reinforced sealing sleeve 30. Through the tightening effect of the two dense arc-shaped seats 33, the tightness of the fit between the reinforced sealing sleeve 30 and the drill pipe 24 can be further enhanced, thereby strengthening the sealing effect when the drill pipe 24 penetrates.

[0050] The present invention has a bushing 301 and a motor 303 respectively disposed above the manhole cover 20. The outer ring wall of the bushing 301 and the outer ring wall of the motor 303 are both fixed to the surface of the manhole cover 20 by a bracket. The bushing 301 has a rotating shaft 302 rotatably disposed inside. The motor 303 is a brake type and is connected to a forward and reverse switch through a wire. The forward and reverse switch can be used to open and close the motor 303 in both directions. At the same time, the brake type can have a braking effect on rotation after power failure. The motor 303 has a drive shaft disposed inside, and the end of the shaft is fixedly connected to the shaft 302 by a coupling. The two ends of the shaft 302 are symmetrically distributed with external threads 304. A threaded sleeve 305 is threadedly installed on the surface of the external threads 304 on either side. A connecting rod 306 is fixedly assembled on the outer ring wall of the threaded sleeve 305. The end of the connecting rod 306 away from the threaded sleeve 305 is fixedly assembled with a compact arc-shaped seat 33.

[0051] Please see Figure 7-8 The present invention further includes an injection mechanism 4 for injecting supercritical CO2 gas flow inside the drill pipe 24. The injection mechanism 4 includes an inlet connector 40, a female two-way connector 41, a bearing 42, a locking nut 43, a pressure ring 44, a sealing rubber sleeve 45, a rubber sleeve spacer 46, an O-ring 47, an injection center tube 48, an injection fracturing tube 49, and an injection nozzle 410. The pressure ring 44 is embedded and installed at the end of the drill pipe 24. The upper end of the pressure ring 44 is mounted with a bearing 42 via the locking nut 44. The bearing 42 is internally interference-fitted and rotatably mounted with an inlet connector 410. The inlet connector 40 is equipped with a female two-way connector 41. A sealing rubber tube 45 is installed at the lower end of the pressure ring 44. A rubber tube spacer 46 and an O-ring 47 are provided on the outer wall of the sealing rubber tube 45. An injection center tube 48 is embedded inside the sealing rubber tube 45. The lower end of the injection center tube 48 is fixedly connected to an injection fracturing tube 49. An injection nozzle 410 is provided at the end of the injection fracturing tube 49. The gas injection mechanism 4 integrated inside the drill pipe 24 greatly improves the stability of supercritical CO2 gas injection operation.

[0052] In specific implementation, the wellhead support component 1 of the present invention achieves stable support and protection for the wellhead body 11 through multiple fixing and sealing structures, while the wellhead sealing component 2 achieves reliable sealing under high pressure through a combination of static and dynamic sealing. The reinforced sealing component 3 further enhances the sealing strength at the drill pipe 24 penetration position through mechanical pressurization and active adjustment mechanisms. To further better explain the above embodiments, the present invention also provides a method for implementing a high-pressure resistant drill pipe and wellhead sealing integrated device for drilling rigs, including the following steps:

[0053] S1: First, the support frame 12 is fixed to the inner wall of the wellhead body 11 by multiple mounting plates 13 and fastening bolts 14 to form a basic support frame to prevent wellhead deformation.

[0054] S2: The inner liner 15 is placed on the upper end of the support frame 12. The outer wall of the inner liner 15 is filled with a concrete bonding layer 16 between the outer wall of the inner liner 15 and the inner wall of the wellhead body 11. The bonding layer 16 not only fills the gaps, but also enhances the stability of the inner liner 15 through the bonding force formed after hardening, preventing the well wall from collapsing under high pressure. The annular plate 17 is welded to the upper end of the outer ring of the inner liner 15 and fixed to the surface of the rock layer 10 by fastening bolts 18, further constraining the axial displacement of the inner liner 15 and preventing the inner liner 15 from detaching due to high pressure in the well. The entire support process combines mechanical fixing and material bonding to ensure the durability and sealing of the wellhead structure in ultra-high pressure jet operation.

[0055] S3: The well cover 20 is fixed to the upper end of the inner liner 15 by fastening bolt three 21. A high-temperature resistant rubber sealing ring 22 is provided on the inner side of the connection between the well cover 20 and the inner liner 15. When the pressure inside the well increases, the sealing ring 22 is squeezed and deformed, which enhances the sealing effect of the contact surface.

[0056] S4: Weld the sealing sleeve 23 to the center of the well cover 20. Its smooth inner wall slides against the smooth outer wall of the drill pipe 24 to form a dynamic sealing structure, which allows the drill pipe 24 to move up and down while maintaining a seal.

[0057] S5: The sealing sleeve 26 is nested inside the annular seat 25 and is press-fitted with the drill rod 24, and then bonded with high-temperature resistant resin to form a one-time fixation.

[0058] S6: The micro anchor 2001 is passed through the sealing sleeve 26 and connected to the positioning plate 2002 by the fastening bolt 2003 to form a secondary fixation; the double fixation method prevents the sealing sleeve 26 from being lifted and detached under high pressure, and ensures the long-term sealing stability of the drill rod 24 penetration point.

[0059] S7: The reinforcing sealing sleeve 30 is bonded to the outer wall of the sealing sleeve 23 and the drill pipe 24 is over-exposed to form an additional sealing layer. Then the limiting sleeve 31 is fixed to the upper end of the well cover 20, and the limiting rod 32 is slidably installed inside it. The end of the limiting rod 32 is welded with a dense arc-shaped seat 33, which is symmetrically wrapped around both sides of the reinforcing sealing sleeve 30.

[0060] S8: The motor 303 drives the external threads 304 at both ends to rotate through the shaft 302, which drives the threaded sleeve 305 to move axially, and then pushes the dense arc-shaped seat 33 to tighten towards the center through the connecting rod 306, compressing and strengthening the sealing sleeve 30, and enhancing its tightness of contact with the drill pipe 24.

[0061] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-pressure resistant integrated drill rod and borehole sealing device for drilling rigs, characterized in that, It includes a wellhead support assembly (1) located in the rock layer (10) and an injection mechanism (4) for supercritical CO2 jet operation. The wellhead support assembly (1) is provided with a wellhead sealing assembly (2) at its upper end, and a reinforced sealing assembly (3) is provided at its upper end. The wellhead support assembly (1) includes a wellhead body (11), a support frame (12), an mounting plate (13), and an inner liner (15). The wellhead body (11) is located inside the rock layer (10). The support frame (12) is located inside the wellhead body (11). Several mounting plates (13) are distributed at the lower end of the support frame (12). The mounting plates (13) are fixedly installed to the inside of the wellhead body (11) by fastening bolts (14). An inner liner (15) is located inside the port of the wellhead body (11). An adhesive layer (16) is provided between the inner liner (15) and the wellhead body (11). The outer wall of the inner liner (15) is wrapped with an annular plate (17). The lower end of the annular plate (17) is attached to the upper plane of the rock layer (10). The wellhead sealing assembly (2) includes a well cover (20), a sealing ring (22), a first sealing sleeve (23), a drill pipe (24), an annular seat (25), and a second sealing sleeve (26). The well cover (20) is fixedly installed to the inner liner (15) by a third fastening bolt (21). A sealing ring (22) is wrapped inside the connection between the well cover (20) and the inner liner (15). A first sealing sleeve (23) is provided through the center of the well cover (20). A drill pipe (24) is sleeved through the inside of the first sealing sleeve (23). An annular seat (25) is provided at the lower end of the first sealing sleeve (23). The inside of the annular seat (25) is connected to the drill pipe (24). The second sealing sleeve (26) is filled inside the annular seat (25). The reinforced sealing assembly (3) includes a reinforced sealing sleeve (30), a limiting sleeve (31), a limiting rod (32), and a dense arc-shaped seat (33); the reinforced sealing sleeve (30) is assembled at the upper sliding connection position between the sealing sleeve (23) and the drill pipe (24); the limiting sleeve (31) is symmetrically distributed on both sides at the upper end of the well cover (20); the limiting rod (32) is slidably sleeved on the inner side of the limiting sleeve (31), and a dense arc-shaped seat (33) is welded to one end of the limiting rod (32), and the dense arc-shaped seat (33) is symmetrically wrapped around both sides of the reinforced sealing sleeve (30); The gas injection mechanism (4) is located inside the drill pipe (24). The gas injection mechanism (4) includes an inlet connector (40), a female two-way connector (41), a bearing (42), a locking nut (43), a pressure ring (44), a sealing rubber sleeve (45), a rubber sleeve spacer (46), an O-ring (47), a gas injection center tube (48), a gas injection fracturing tube (49), and a gas injection nozzle (410). The pressure ring (44) is embedded and installed at the end of the drill pipe (24). The upper end of the pressure ring (44) is equipped with a bearing (42) through the locking nut (43). The bearing (42) is internally interference-fitted and rotatably mounted with an inlet connector (40). The inlet connector (40) is provided with a female two-way connector (41). The lower end of the pressure ring (44) is also equipped with a sealing rubber tube (45). The outer ring wall of the sealing rubber tube (45) is provided with a rubber tube spacer (46) and an O-ring (47). The sealing rubber tube (45) is internally embedded with an injection center tube (48). The lower end of the injection center tube (48) is fixedly connected to an injection fracturing tube (49). The end of the injection fracturing tube (49) is provided with an injection nozzle (410).

2. The integrated high-pressure resistant drill rod and borehole sealing device for drilling rigs as described in claim 1, characterized in that: The outer ring wall of the support frame (12) is slidably attached to the inner wall of the wellhead body (11). The mounting plates (13) distributed at multiple points at the lower end of the support frame (12) are used in conjunction with fastening bolts (14) to stably install the support frame (12) and the inner wall of the wellhead body (11). The support frame (12) is used to support the inner liner (15) above.

3. The integrated high-pressure resistant drill rod and borehole sealing device for drilling rigs as described in claim 1, characterized in that: The adhesive layer (16) is made of concrete and is used to bond and fill the gap between the inner liner (15) and the wellhead body (11). The upper end of the inner liner (15) penetrates the interior of the wellhead body (11) and extends upward a certain distance. Several fastening bolts (18) are distributed on the annular plate (17). The annular plate (17) is fixedly assembled with the rock layer (10) by the fastening bolts (18).

4. The integrated high-pressure resistant drill rod and borehole sealing device for drilling rigs as described in claim 1, characterized in that: The sealing ring (22) is made of high temperature resistant rubber material. The outer ring wall of the sealing ring (22) is fixed to the inner wall of the inner liner (15) by screws. The upper end face of the sealing ring (22) is pressed and fitted against the lower end face of the well cover (20).

5. As described in claim 1, the connection position of the sealing sleeve (23) and the well cover (20) is fixed by welding. The inner ring wall of the sealing sleeve (23) and the outer ring wall of the drill rod (24) are both smooth surfaces. The two slide and fit together to form a sealed moving rod and stationary ring structure. Through smooth and non-protruding sleeve contact, a dynamic sliding seal is formed.

6. The integrated high-pressure resistant drill rod and borehole sealing device for drilling rigs as described in claim 1, characterized in that: The sealing sleeve 2 (26) is made of high temperature resistant rubber material. The surface of the drill rod (24) penetrates the interior of the sealing sleeve 2 (26). The sealing sleeve 2 (26) and the drill rod (24) are pressed together by interference fit. The outer ring wall of the sealing sleeve 2 (26) and the inner ring wall of the annular seat (25) are bonded and fixed by high temperature resistant resin adhesive.

7. The integrated high-pressure resistant drill rod and borehole sealing device for drilling rigs as described in claim 6, characterized in that, The interior of the sealing sleeve 2 (26) is provided with several micro anchor rods (2001), and the lower end of the annular seat (25) is provided with several positioning plates (2002). The position of any positioning plate (2002) corresponds to the position of the micro anchor rod (2001). The surface of the positioning plate (2002) is provided with fastening bolts 4 (2003). The interior of the micro anchor rod (2001) is provided with a threaded groove. The positioning plate (2002) is assembled with the threaded groove of the micro anchor rod (2001) by fastening bolts 4 (2003).

8. The integrated high-pressure resistant drill rod and borehole sealing device for drilling rigs as described in claim 1, characterized in that: The inner ring wall of the reinforced sealing sleeve (30) and the outer ring wall of the sealing sleeve (23) are bonded and fixed by resin adhesive. The inner ring wall of the reinforced sealing sleeve (30) and the outer ring wall of the drill pipe (24) are installed tightly by interference fit. The outer ring wall of the limiting sleeve (31) is fixed to the upper end of the well cover (20) by a bracket.

9. The integrated high-pressure resistant drill rod and borehole sealing device for drilling rigs as described in claim 1, characterized in that: A bushing (301) and a motor (303) are respectively provided on the top of the manhole cover (20). A shaft (302) is rotatably provided inside the bushing (301). A drive shaft is provided inside the motor (303). The end of the shaft is fixedly connected to the shaft (302) by a coupling. External threads (304) are symmetrically distributed at both ends of the shaft (302). A threaded sleeve (305) is threadedly installed on the surface of the external threads (304) on any side. A connecting rod (306) is fixedly assembled on the outer ring wall of the threaded sleeve (305). The end of the connecting rod (306) away from the threaded sleeve (305) is fixedly assembled with a dense arc-shaped seat (33).

10. A method for implementing the integrated high-pressure resistant drill rod and borehole sealing device for drilling rigs as described in claim 1, characterized in that: Includes the following steps: S1: The support frame (12) is fixed to the inner wall of the wellhead body (11) by multiple mounting plates (13) and fastening bolts (14) to form a basic support frame; S2: Place the inner liner (15) on the upper end of the support frame (12), fill the space between its outer wall and the inner wall of the wellhead body (11) with concrete bonding layer (16), then weld the annular plate (17) to the upper end of the outer ring of the inner liner (15), and fix it to the surface of the rock layer (10) by fastening bolt two (18). S3: Fix the manhole cover (20) to the upper end of the inner liner (15) with fastening bolt three (21), and set a high temperature resistant rubber sealing ring (22) on the inner side of the joint. S4: Weld the sealing sleeve (23) to the center of the well cover (20). Its smooth inner wall slides against the smooth outer wall of the drill rod (24) to form a dynamic sealing structure, which allows the drill rod (24) to move up and down while maintaining the seal. S5: The sealing sleeve 2 (26) is nested inside the annular seat (25) and pressurized with the drill rod (24), and then fixed by bonding with high temperature resistant resin glue; S6: The miniature anchor rod (2001) is passed through the sealing sleeve two (26) and connected to the positioning plate (2002) by the fastening bolt four (2003) to form a secondary fixation; S7: The reinforced sealing sleeve (30) is bonded to the outer wall of the sealing sleeve (23) and the drill pipe (24) is over-exposed to form an additional sealing layer. Then the limiting sleeve (31) is fixed to the upper end of the well cover (20), and the limiting rod (32) is slidably installed inside it. The end of the limiting rod (32) is welded with a dense arc-shaped seat (33) and symmetrically wrapped around both sides of the reinforced sealing sleeve (30). S8: The motor (303) drives the external threads (304) at both ends to rotate through the shaft (302), which drives the threaded sleeve (305) to move axially, and then pushes the dense arc seat (33) to tighten towards the center through the connecting rod (306), squeezing and strengthening the sealing sleeve (30) to enhance its tightness with the drill rod (24).

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