Large-caliber down-the-hole hammer ring seal packer and pneumatic reverse circulation forming device and method

Abstract

The invention discloses a large-diameter down-hole hammer ring seal packer and a reverse circulation forming device and method, solves the problems that a sealing device in a reverse circulation forming device in the prior art is prone to leakage and not easy to replace, and has the beneficial effects of being not prone to leakage and high in structural stability. Comprising an inner pipe and an outer pipe, the inner pipe is inserted into the outer pipe, the inner pipe and the outer pipe are arranged at intervals, one end of the inner pipe and one end of the outer pipe can be connected with a double-wall drill rod, the outer pipe is annularly sleeved with an inflation inner sleeve, a plurality of through holes are annularly formed in the inflation inner sleeve, and an inflatable air bag is arranged on the outer side face of the inflation inner sleeve; the air outlet is communicated with the through hole of the inner inflation sleeve, one end of the inner inflation sleeve is limited by the outer pipe, the two ends of the inflatable air bag are fastened by the inner inflation sleeve and the annular component, and the annular component is detachable relative to the outer pipe so that the inflatable air bag can be replaced conveniently.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic down-the-hole hammers, in particular to a large-caliber down-the-hole hammer ring seal packer, a pneumatic reverse circulation forming device and a method. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Pneumatic down-the-hole hammer drilling technology is a drilling technology that emerged with the application of air drilling technology. It uses compressed air as the power. The high-frequency energy impact generated by the down-the-hole hammer, combined with the rotary drive of the drill rig and drill pipe, forms a continuous crushing of the rock. The wind speed is used to cool the hammer and remove dust. Pneumatic down-the-hole hammers are divided into positive circulation down-the-hole hammers and reverse circulation down-the-hole hammers according to the circulation mode. In positive circulation down-the-hole hammer drilling, compressed air enters the down-the-hole hammer from the drill pipe, driving the down-the-hole hammer piston to impact the impactor and rock. The crushed rock cuttings are returned through the annular gap between the drill pipe and the hole wall. Pneumatic positive circulation down-the-hole hammers use a combination of impact and rotation, achieving significantly higher hard rock drilling speeds than conventional rotary drills. However, they also have significant disadvantages: they require a very high gas source, are highly dependent on equipment, and consume far more energy than conventional rotary drills. They have poor stratum adaptability: in soft formations such as clay and shale, high-speed airflow and impact vibration can damage the hole wall, leading to a collapse rate as high as 40%. Furthermore, drill sticking accidents are prone to occur, and poor slag removal can cause the down-the-hole hammer to stall or even be damaged. Drilling hole size and depth are limited: large-diameter and deep-hole drilling cannot be performed. For large-diameter holes (e.g., Φ300 mm, or >400 mm for large-diameter holes such as mine rescue holes, ventilation holes, and seismic observation holes), the impact energy is dispersed, reducing rock-breaking efficiency.

[0004] Considering the above problems, reverse circulation down-the-hole hammer drilling is now widely used. In reverse circulation down-the-hole hammer drilling, compressed air enters the down-the-hole hammer through the double-wall drill pipe, and the broken rock cuttings are discharged from the central channel of the inner tube of the double-wall drill pipe. The reverse circulation of the down-the-hole hammer is achieved through the plugging method and the ejection method. The problems are: The ejection method is to design an ejection device on the impactor to suck the bottom hole gas to form a reverse circulation. This method not only requires the re-development of the impactor and the impactor, but also requires the use of a suction pump, which greatly increases the engineering cost and is cumbersome. The plugging method is to install a packer sealing ring at the wellhead or in the hole. In this method, the sealing device is in close contact with the hole wall, which has the following problems: The sealing device is a flexible structural component, and the end is not easy to fix. In addition, the hole wall is irregular, which can easily lead to high-pressure gas leakage during the sealing process. After leakage, it needs to be resealed, which reduces the drilling speed. The sealing device has a certain service life. The existing sealing devices are all fastened to the drill pipe circumference and are not easy to disassemble and replace with new sealing devices. When the hole wall is unstable or the drill is stuck, it is easy to cause drill burial accidents, which are time-consuming and costly to deal with. The sealing device is installed on the outside of the drill rod, and the drill rod needs to rotate. Because the sealing device and the drill rod are fixed as an integral structure in the existing solution, the sealing device will be driven to rotate together during the rotation of the drill rod, which may easily cause the borehole to collapse. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the object of the present invention is to provide a large-caliber down-the-hole hammer ring seal packer to ensure the stable setting of the inflatable airbag and realize the replaceable inflatable airbag.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions: A large-diameter down-the-hole hammer ring seal packer includes an inner tube and an outer tube. The inner tube is inserted into the outer tube and a distance is set between the inner tube and the outer tube for air supply. The outer tube is circumferentially sleeved with an inflatable inner sleeve. The inflatable inner sleeve is circumferentially provided with multiple through holes. An inflatable airbag is provided on the outer side of the inflatable inner sleeve. The outer tube is provided with an air outlet hole, which is connected to the through hole of the inflatable inner sleeve. One end of the inflatable inner sleeve is limited by the outer tube. Both ends of the inflatable airbag are fastened by the inflatable inner sleeve and an annular component. The annular component is detachable relative to the outer tube to facilitate replacement of the inflatable airbag. When the inflatable airbag contacts the side wall of the borehole after inflation, the outer tube can rotate relative to the inflatable inner sleeve driven by the drill pipe.

[0007] The large-caliber down-the-hole hammer ring seal packer as described above, wherein a relief valve is provided at one end of the inflatable inner sleeve, the air inlet of the relief valve is communicated with the interior of the inflatable airbag, and the air outlet of the relief valve is communicated with the outside world; The overflow valve is arranged through the annular component at one end, the air inlet of the overflow valve is arranged through the inflation inner sleeve, and the air outlet of the overflow valve is arranged through the corresponding annular component.

[0008] As described above, the large-caliber down-the-hole hammer annular seal packer has annular components provided at both ends of the inflatable inner sleeve, and the annular components include bearing movable sleeves to enable the outer tube to rotate relative to the inflatable inner sleeve after the inflatable airbag contacts the inner wall of the borehole.

[0009] The large-caliber down-the-hole hammer ring seal packer as described above, wherein the annular component further comprises airbag clamping rings provided at both ends of the inflatable airbag, the airbag clamping rings being fixedly connected to the annular component; The end of the inflatable airbag is bent outward to form a protruding edge, and a groove is arranged on the inner side of the airbag clamping ring to be engaged with the protruding edge of the end of the inflatable airbag.

[0010] The large-caliber down-the-hole hammer annular seal packer as described above, wherein the annular member is provided with a recess at one end thereof facing the inflatable inner sleeve, and the two ends of the inflatable inner sleeve are respectively inserted into the recesses of the annular member; The outer diameter of the inflatable inner sleeve is adapted to the diameter of the end portion of the inflatable airbag.

[0011] The large-caliber down-the-hole hammer annular seal packer as described above, wherein a static bearing sleeve is provided on the outer side of the movable bearing sleeve at one end of the outer tube, and a locking component is provided on the end of the static bearing sleeve away from the movable bearing sleeve, the locking component is fixedly connected to the outer tube, and the locking component is engaged with the static bearing sleeve; A pedestal is provided in the circumferential direction of the outer tube, and the pedestal supports the bearing movable sleeve at one end of the inflatable inner sleeve.

[0012] The large-caliber down-the-hole hammer ring seal packer as described above, wherein the inflatable inner sleeve is arranged beyond both ends of the inflatable airbag; Sealing elements are provided between both ends of the inflatable inner sleeve and the outer tube.

[0013] As described above, the large-diameter down-the-hole hammer ring seal packer, the interior of the outer tube includes a first section, a cylindrical section and a second section connected in sequence, the first section and the second section are set at a distance, the first section is conical, and the second section is annular, an expanded diameter section is provided at one end of the inner tube, the expanded diameter section of the inner tube is adapted to the first section, and the inner tube is also provided with an annular protruding section, and the annular protruding section of the inner tube can be stuck in the second section of the outer tube.

[0014] In the second aspect, the present invention discloses a large-diameter down-the-hole hammer ring seal diversion type pneumatic reverse circulation forming device, including the large-diameter down-the-hole hammer ring seal isolation device, the top ends of the inner tube and the outer tube are connected to the double-wall drill pipe, the bottom ends of the inner tube and the outer tube are connected to the diverter, the diverter is connected to the impactor, a central tube and an air supply channel are arranged inside the diverter, the bottom end of the central tube is closed, and the central tube is connected to the slag discharge channel so that the rock cuttings enter the central tube through the slag discharge channel and then enter the hollow part of the inner tube for slag discharge, and the compressed gas entering the double-wall drill pipe passes through the channel between the inner tube and the outer tube and then passes through the air supply channel to enter the impactor.

[0015] In a third aspect, the present invention further discloses a working method of a large-caliber down-the-hole hammer ring seal flow-guiding pneumatic reverse circulation forming device, including the following contents: The inner tube is inserted into the outer tube, an inflatable inner sleeve is provided in an annular direction on the outer tube and one end of the inflatable inner sleeve is limited, an inflatable airbag is sheathed on the outer side of the inflatable inner sleeve, and both ends of the inflatable airbag are fastened by the inflatable inner sleeve and the annular member, and the annular member is detachable relative to the outer tube; The outer tube is inserted into the drilled hole, and gas with a set pressure enters through the space between the inner tube and the outer tube, and enters the inflatable airbag through the air outlet hole of the outer tube and the through hole of the inflatable inner sleeve; The inflatable airbag is in full contact with the borehole wall to form a barrier; One end of the inner and outer tubes is connected to the double-wall drill pipe. The inner tube serves as a slag discharge channel. One end of the inner and outer tubes is connected to the impactor. The cuttings enter the center tube through the slag discharge channel of the diverter and then enter the hollow part of the inner tube for slag discharge. The compressed gas entering the double-wall drill pipe passes through the channel between the inner and outer tubes and then through the air supply channel to enter the impactor. After the working time is set, the inner tube and the outer tube are lifted out of the drilled hole, and the annular member is removed to replace the inflatable airbag.

[0016] The beneficial effects of the present invention are as follows: The present invention provides a reverse circulation forming device, which is provided with an inflatable inner sleeve. The inflatable inner sleeve supports the inflatable airbag from the inside. One end of the inflatable inner sleeve is limited by the outer tube. The two ends of the inflatable airbag are fastened by the inflatable inner sleeve and the annular member. The cooperation between the inflatable inner sleeve and the annular member can facilitate the fixation of the end of the inflatable airbag, which is conducive to ensuring the sealing of the end of the inflatable airbag and avoiding the problem of air leakage of the inflatable airbag. It significantly improves the efficiency and reliability of hard rock drilling. It is particularly suitable for deep holes, large diameters and complex formations. It reduces annular gap leakage, enhances the slag return capacity of the internal channel of the inner tube, and improves the slag discharge efficiency by 20% to 40%, which is conducive to reducing energy consumption. After the seal is optimized, the air pressure utilization rate is improved, and the energy consumption of the air compressor is reduced by 15% to 25%. In the present invention, the annular member is provided at the end of the inflatable airbag. The annular member cooperates with the inflatable inner sleeve to achieve the fixation of the end of the inflatable airbag. The inflatable airbag can be replaced by removing the annular member. The replacement speed is also relatively fast. After the replacement is completed, it can be stably installed again. In the present invention, an overflow valve is provided at one end of the inflatable inner sleeve. When the air pressure inside the inflatable airbag is greater than the set value, the gas can be discharged through the overflow valve, so that the whole can adapt to complex formations and avoid the occurrence of drill sticking and hole collapse as much as possible in broken zones or soft formations. 4) In the present invention, bearing movable sleeves are provided at both ends of the inflatable inner sleeve. The upper bearing movable sleeve cooperates with the bearing static sleeve, and the lower bearing movable sleeve is supported by a pedestal fixed to the outer tube. The end of the inflatable airbag is fixed by the cooperation of the bearing movable sleeve, the airbag retaining ring, and the inflatable inner sleeve. In addition, the provision of the bearing movable sleeve enables the outer tube to realize rotational motion relative to the inflatable inner sleeve / inflatable airbag, thereby ensuring the smooth operation of the drill rod, avoiding the inflatable airbag from rotating together with the drill rod, and avoiding the occurrence of hole collapse.

[0017] 5) The present invention improves the adaptability of the formation by using the inner tube channel as the slag discharge channel. Since the water and rock debris in the formation are discharged through the inner tube, there is no erosion of the formation. Construction can be carried out in unstable formations, and large-diameter and deep well construction can be carried out. The inflatable airbag fits the formation more closely and has the function of retraction when the air is stopped. The sealing is better during normal operation, and the drill is prevented from getting stuck or buried when encountering falling blocks or unstable formations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] Figure 1 Schematic diagram of an outer tube in a large-diameter down-the-hole hammer ring seal packer according to one or more embodiments of the present invention.

[0020] Figure 2 Schematic diagram of an inner tube in a large-diameter down-the-hole hammer annular seal packer according to one or more embodiments of the present invention.

[0021] Figure 3 Schematic diagram of an inflatable inner sleeve in a large-diameter down-the-hole hammer annular seal packer according to one or more embodiments of the present invention.

[0022] Figure 4 Schematic diagram of an inflatable airbag in a large-diameter down-the-hole hammer ring seal packer after inflation according to one or more embodiments of the present invention.

[0023] Figure 5 Schematic diagram of a bearing static sleeve in a large-diameter down-the-hole hammer ring seal packer according to one or more embodiments of the present invention.

[0024] Figure 6 Schematic diagram of a locking component in a large-diameter down-the-hole hammer annular seal packer according to one or more embodiments of the present invention.

[0025] Figure 7 The present invention is an exploded schematic diagram of components such as annular members provided at both ends of an inflatable inner sleeve of a large-caliber down-the-hole hammer annular seal packer according to one or more embodiments of the present invention.

[0026] Figure 8 Schematic diagram of a large-diameter down-the-hole hammer ring seal packer according to one or more embodiments of the present invention.

[0027] Figure 9 1 is a schematic cross-sectional view of a large-diameter down-the-hole hammer ring seal packer according to one or more embodiments of the present invention.

[0028] Figure 10 1 is a schematic external view of a finished product of a large-diameter down-the-hole hammer annular seal packer according to one or more embodiments of the present invention.

[0029] Figure 11 It is a schematic diagram of the explosion of a finished product of a large-diameter down-the-hole hammer ring seal packer according to one or more embodiments of the present invention.

[0030] Figure 12 It is an enlarged cross-sectional view of a portion of the structure of a large-diameter down-the-hole hammer ring seal packer in operation according to one or more embodiments of the present invention.

[0031] Figure 13 It is a front view of a flow divider in a large-caliber down-the-hole hammer ring seal flow-guiding pneumatic reverse circulation forming device according to one or more embodiments of the present invention.

[0032] Figure 14 It is a half-sectional schematic diagram of a flow diverter in a large-caliber down-the-hole hammer ring seal flow-guiding pneumatic reverse circulation forming device according to one or more embodiments of the present invention.

[0033] Figure 15 It is a schematic diagram of the cross-section of the connection between the diverter and the packer in the large-caliber down-the-hole hammer ring seal diversion type pneumatic reverse circulation forming device according to one or more embodiments of the present invention.

[0034] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0035] Wherein: 1. Outer tube, 2. Air outlet, 3. Base, 4. First section, 5. Second section, 6. Inner tube, 7. Diameter expansion section, 8. Annular protruding section, 9. Inflatable inner sleeve, 10. Through hole, 11. Inflatable airbag, 12. Flange, 13. Bearing static sleeve, 14. Protrusion, 15. Locking component, 16. Recess, 17. Bearing movable sleeve, 18. Airbag retaining ring, 19. Overflow valve, 20. Air inlet of overflow valve, 21. Air outlet of overflow valve, 22. Seal, 23. Fastening bolt, 24. Countersunk bolt, 25. Air supply channel, 26. Center tube, 27. Slag discharge channel, 28. Diverter, 29. Threaded structure. DETAILED DESCRIPTION

[0036] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0037] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise clearly indicated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprising" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations; As described in the background art, the sealing device in the reverse circulation forming device in the prior art is prone to leakage and difficult to replace. In order to solve the above technical problems, the present invention proposes a large-diameter down-the-hole hammer ring seal packer.

[0038] Example 1 In a typical embodiment of the present invention, reference is made to Figure 8 、 Figure 10 、 Figure 11 and Figure 12 As shown, a large-caliber down-the-hole hammer ring seal packer comprises an inner tube 6 and an outer tube 1. The inner tube 6 is inserted into the outer tube 1 and a distance is set between the inner tube 6 and the outer tube 1. One end of the inner tube 6 and the outer tube 1 can be connected to the upper joint of the drill pipe, and the other end of the inner tube 6 and the outer tube 1 is connected to the impactor. The outer tube 1 is circumferentially sleeved with an inflatable inner sleeve 9, and the inflatable inner sleeve 9 is circumferentially provided with a plurality of through holes 10. An inflatable airbag 11 is provided on the outer side surface of the inflatable inner sleeve 9. The outer tube 1 is provided with an air outlet 2, and the air outlet 2 is communicated with the through hole 10 of the inflatable inner sleeve 9. One end of the inflatable inner sleeve 9 is limited by the outer tube 1, and both ends of the inflatable airbag 11 are fastened by the inflatable inner sleeve 9 and the annular component. The annular component is detachable relative to the outer tube 1 to facilitate the replacement of the inflatable airbag 11. When the inflatable airbag 11 contacts the side wall of the borehole after inflation, the outer tube can rotate relative to the inflatable inner sleeve 9 driven by the drill pipe.

[0039] The reverse circulation forming device provided in this embodiment can facilitate the fixation of the end of the inflatable airbag 11 through the cooperation of the inflatable inner sleeve 9 and the annular component, which is beneficial to ensure the sealing of the end of the inflatable airbag, avoid the leakage problem of the inflatable airbag 11, and significantly improve the efficiency and reliability of hard rock drilling. It is particularly suitable for deep holes, large diameters and complex formations.

[0040] refer to Figure 1 As shown, the outer tube 1 is provided with a first section 4 and a second section 5, and the first section 4 and the second section 5 are spaced apart. The first section is conical and the second section is annular. Figure 2 As shown, an expanded diameter section 7 is provided at one end of the inner tube 6, and the inner tube expanded diameter section 7 and the first section of the outer tube are used to be connected with a drill pipe such as a double-wall drill pipe. The inner tube expanded diameter section 7 is adapted to the first section 4, and the inner tube is further provided with an annular protruding section 8. The size of the inner tube annular protruding section 8 is adapted to the size of the second section 5 of the outer tube. The inner tube annular protruding section 8 can be inserted into the second section 5 of the outer tube. After the inner tube 6 is inserted into the outer tube 1, the inner tube annular protruding section is inserted into the second section 5 inside the outer tube 1 to realize the connection between the inner tube and the outer tube. The tapered first section facilitates the insertion of the inner tube into the outer tube 1. The bottom ends of the inner and outer tubes can be connected to the diverter by threads or bolts.

[0041] The inner tube enlarged diameter section 7 is connected to the inner tube body through a transition of a tapered section, and the lengths of the inner tube and the outer tube are adapted to each other.

[0042] It should be noted that double-wall drill pipe is an existing technology.

[0043] It is easy to understand that the outer tube 1 is circumferentially provided with a pedestal 3, which supports and limits the annular component at one end of the inflatable inner sleeve, namely the bearing movable sleeve 17. The pedestal 3 can be a conical pedestal, which is placed below the air outlet of the outer tube. The distance between the pedestal 3 and the air outlet 2 is less than the height of the inflatable inner sleeve, ensuring that the inflatable airbag is inflated through the air outlet.

[0044] It should be noted that the inflatable inner sleeve 9 can be made of a rigid material, and the distance between the inflatable inner sleeve 9 exceeds the two ends of the inflatable airbag. Figure 3 As shown, the inflatable inner sleeve 9 is circumferentially provided with multiple rows and columns of through holes 10, specifically more than four rows of through holes 10 can be provided, and each row can be provided with at least three through holes. The end of the inflatable airbag is placed between the outermost through hole and the end of the inflatable inner sleeve to avoid air leakage. The inflatable inner sleeve serves as an inflation transition piece. The multiple circumferential through holes 10 of the inflatable inner sleeve 9 can facilitate the uniform flow of gas and the uniform inflation of the inflatable airbag. Seals 22 are provided between both ends of the inflatable inner sleeve and the outer tube. The seals 22 can be selected from rubber sealing rings to avoid the occurrence of air leakage problems.

[0045] In this embodiment, annular members are respectively provided at both ends of the inflatable inner sleeve 9. The annular members include a bearing movable sleeve 17, which replaces the rotation path of the traditional ball bearing and makes the rotation of the outer tube 1 relative to the inflatable inner sleeve 9 more flexible and reliable; the bearing movable sleeve 17 is provided with a recess at one end facing the inflatable inner sleeve, and the two ends of the inflatable inner sleeve are respectively inserted into the recesses of the bearing movable sleeve. The inner diameter of the bearing movable sleeve is slightly larger than the outer diameter of the outer tube to ensure that the outer tube can rotate relative to the inflatable inner sleeve. The provision of the annular member not only ensures that it cooperates with the inflatable inner sleeve to achieve fixation of the end of the inflatable airbag 11, but also ensures that the outer tube can rotate relative to the inflatable inner sleeve. Among them, the upper bearing movable sleeve is limited by the bearing static sleeve 13, and the outer tube is circumferentially provided with a bearing static sleeve 13 on the upper side of the upper bearing movable sleeve. A locking component 15 is provided at one end of the bearing static sleeve away from the bearing movable sleeve. The locking component 15 is fixedly connected to the outer tube 1. The locking component 15 is a locking ring, and an opening is provided in the locking ring. A blind hole is provided in the outer tube at the position where the locking ring is provided. A fastener such as a fastening bolt 23 is provided through the locking ring opening and the blind hole, and the fastening bolt is provided perpendicular to the central axis of the inner tube.

[0046] The locking component is engaged with the bearing static sleeve, and a plurality of recesses are provided on one end of the locking component facing the bearing static sleeve. Figure 5 As shown, the bearing static sleeve 13 is provided with a plurality of protrusions 14 at one end facing the locking member, and the protrusions 14 can be inserted into the recesses 16 (refer to Figure 6 As shown), the locking component 15 is axially connected to the bearing static sleeve 13, so that the outer tube can rotate relative to the inflatable airbag 11.

[0047] In this embodiment, the upper half of the locking component 15 is tapered, with a smaller upper portion and a larger lower portion. A tapered section is provided in the middle section of the bearing static sleeve 13 to increase the size of the bearing static sleeve so as to ensure stable contact with the bearing dynamic sleeve. The setting of the locking component 15 effectively limits the bearing static sleeve 13 and the bearing dynamic sleeve 17, and limits the inflatable inner sleeve, thereby limiting the upper position of the inflatable inner sleeve 9. Combined with the setting of the lower side pedestal 3 on the lower side bearing dynamic sleeve 17, the outer tube 1 can rotate circumferentially relative to the inflatable inner sleeve 9, and the inflatable inner sleeve can only move axially relative to the drilled hole.

[0048] Specifically, the bearing movable sleeve 17 is newly selected as a TC bearing (hard alloy bearing) movable sleeve, and the bearing static sleeve 13 is selected as a TC bearing static sleeve, that is, the bearing outer surface is sprayed with a hard alloy, a high entropy alloy wear-resistant layer, or a copper sleeve.

[0049] In this embodiment, the outer diameter of the inflatable inner sleeve 9 is adapted to the diameter of the end of the inflatable airbag 11, so that the end of the inflatable airbag 11 fits in contact with the outer surface of the inflatable inner sleeve 9, further preventing air leakage. As shown in the reference figure, the annular member also includes airbag clamps provided at both ends of the inflatable airbag, and the airbag clamps are fixedly connected to the bearing movable sleeve. refer to Figure 4 As shown, the end of the inflatable airbag 11 is bent outward to form a protrusion 12, and a groove is provided on the inner side of the airbag snap ring 18 to engage with the protrusion at the end of the inflatable airbag. The inner diameter of the airbag snap ring 18 is adapted to the outer diameter of the end of the inflatable airbag 11, and the protrusion is inserted into the groove of the airbag snap ring 18. The airbag snap ring 18 and the inflatable airbag 11 are connected by engaging. After the airbag snap ring 18 is connected to the bearing movable sleeve 17, the sealing performance is effectively guaranteed.

[0050] In order to ensure the stable connection between the airbag retaining ring 18 and the bearing movable sleeve 17, the airbag retaining ring 18 is provided with a threaded hole, and the bearing movable sleeve 17 is provided with a connecting hole. Fasteners such as countersunk bolts 24 (to ensure the contact between the bearing static sleeve and the upper bearing movable sleeve, or to ensure the contact between the lower bearing movable sleeve and the pedestal) pass through the connecting hole of the bearing movable sleeve and are connected to the threaded hole of the airbag retaining ring to achieve a stable connection between the bearing movable sleeve and the airbag retaining ring.

[0051] refer to Figure 7 and Figure 9 As shown, an overflow valve 19 is provided at the bottom end of the inflatable inner sleeve 9, the air inlet 20 of the overflow valve is communicated with the interior of the inflatable airbag 11, and the air outlet 21 of the overflow valve is communicated with the outside. Specifically, the overflow valve 19 is arranged through the lower bearing movable sleeve, the air inlet 20 of the overflow valve passes through the side wall of the inflatable inner sleeve and is communicated with the interior of the inflatable airbag 11, and the air outlet 21 of the overflow valve is arranged through the lower bearing movable sleeve. In this way, when the gas pressure in the inflatable airbag 11 is relatively high, the gas in the inflatable airbag flows into the drilled hole through the overflow valve.

[0052] In this embodiment, the inflatable airbag 11 is made of synthetic rubber, such as nitrile rubber, to form a wear-resistant inflatable airbag. Because its molecular structure contains acrylonitrile units, the strength and other properties of the rubber are enhanced. The compressive strength of the nitrile rubber airbag may be higher than that of natural rubber, and in some industrial applications, it can withstand a pressure of 5-15 MPa. Under the same inflation pressure, the nitrile rubber airbag will expand more than an airbag made of a less elastic material. A circular airbag with an initial diameter of 400 mm may only expand to approximately 420 mm-450 mm under a lower inflation pressure (such as 0.1 MPa); while under a higher inflation pressure (such as 0.5 MPa), it may expand to 500 mm-600 mm or even larger.

[0053] Air is inflated through the inner and outer tubes and the inflatable inner sleeve. The inflatable bag expands and contacts the borehole wall, isolating the gas below. The bag remains stationary relative to the circumference of the borehole and moves only axially relative to the formation borehole. When the air compressor connected to the drill pipe is operating, compressed air enters the inflatable bag 11 through the annular gap between the inner and outer walls of the double-walled drill pipe. The bag inflates and contacts the borehole wall, achieving the desired isolation. In the event of a complex situation such as a falling block, the air compressor stops and the bag naturally retracts, preventing any stuck drill pipe accidents.

[0054] Example 2 This embodiment discloses a large-caliber down-the-hole hammer ring seal diversion type pneumatic reverse circulation forming device, including the large-caliber down-the-hole hammer ring seal packer described in Example 1, the top ends of the inner tube and the outer tube are connected to the double-wall drill pipe, the bottom ends of the inner tube 6 and the outer tube 1 are connected to the diverter 28, and the bottom end of the diverter 28 is provided with a threaded structure 29 to connect with the impactor through the threaded structure, and the impactor is connected to the drill bit. Figure 13 、 Figure 14 and Figure 15 As shown, the diverter 28 is cylindrical, with a conical top end to connect with the inner tube. A central tube 26 and an air supply channel 25 are provided inside the diverter 28. The air supply channel 25 is provided on both sides of the central tube 26. The transverse cross-section of the air supply channel 25 is arc-shaped. The bottom end of the central tube 26 is closed. The central tube 26 is connected to the slag discharge channel 27 so that the rock cuttings enter the central tube through the slag discharge channel and then enter the hollow part of the inner tube for slag discharge. The compressed gas entering the double-wall drill pipe passes through the channel between the inner tube and the outer tube and then passes through the air supply channel 25 to enter the impactor.

[0055] Among them, the air supply channel 25 is placed on the outside of the central tube 26, the central tube 26 is connected to the bottom end of the inner tube, the air supply channel can be connected to the impactor, and the slag discharge channel can be set in multiple places, and the slag discharge channel is set inclined downward relative to the central axis of the central tube.

[0056] Example 3 This embodiment provides a working method of a large-caliber down-the-hole hammer ring seal flow-guiding pneumatic reverse circulation forming device, including the following contents: The inner tube 6 is inserted into the outer tube 1. The outer tube 1 is provided with an inflatable inner sleeve in an annular direction and one end of the inflatable inner sleeve is limited. The inflatable airbag 11 is sleeved on the outer side of the inflatable inner sleeve 9. The two ends of the inflatable airbag are fastened by the inflatable inner sleeve and the annular member. The annular member is detachable relative to the outer tube. The outer tube 1 is inserted into the drilled hole, and gas with a set pressure enters through the space between the inner tube and the outer tube, and enters the inflatable airbag through the air outlet hole of the outer tube and the through hole of the inflatable inner sleeve; The inflatable airbag 11 is in full contact with the borehole wall to form a barrier; One end of the inner tube 6 and the outer tube 1 can be connected to the upper joint of the drill pipe. The inner tube serves as a slag discharge channel. One end of the inner tube and the outer tube is connected to the impactor. The cuttings enter the central tube through the slag discharge channel of the diverter and then enter the hollow part of the inner tube for slag discharge. The compressed gas entering the double-wall drill pipe passes through the channel between the inner tube and the outer tube and then through the air supply channel to enter the impactor for power drilling. After the set working time, the inner tube 6 and the outer tube 1 are lifted out of the drilled hole, and the annular member is removed to replace the inflatable airbag.

[0057] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. Large diameter down-the-hole hammer ring seal packer, characterized by: The utility model comprises an inner tube and an outer tube, the inner tube is inserted into the inner part of the outer tube and a distance is set between the inner tube and the outer tube for air supply, the outer tube is circumferentially provided with an inflatable inner sleeve, the inflatable inner sleeve is circumferentially provided with a plurality of through holes, an inflatable airbag is provided on the outer side surface of the inflatable inner sleeve, an air outlet hole is provided on the outer tube, the air outlet hole is connected with the through hole of the inflatable inner sleeve, one end of the inflatable inner sleeve is limited by the outer tube, the two ends of the inflatable airbag are fastened by the inflatable inner sleeve and the annular component, the annular component is detachable relative to the outer tube to facilitate the replacement of the inflatable airbag, and when the inflatable airbag contacts the side wall of the borehole after being inflated, the outer tube is rotatable relative to the inflatable inner sleeve driven by the drill rod.

2. The large-caliber down-the-hole hammer ring seal packer according to claim 1, characterized in that: A relief valve is provided at one end of the inflatable inner sleeve, an air inlet of the relief valve is communicated with the interior of the inflatable airbag, and an air outlet of the relief valve is communicated with the outside world; The overflow valve is arranged through the annular component at one end, the air inlet of the overflow valve is arranged through the inflation inner sleeve, and the air outlet of the overflow valve is arranged through the corresponding annular component.

3. The large-caliber down-the-hole hammer ring seal packer according to claim 1, characterized in that: The annular components are respectively provided at both ends of the inflatable inner sleeve, and the annular components include bearing movable sleeves to enable the outer tube to rotate relative to the inflatable inner sleeve after the inflatable airbag contacts the inner wall of the drill hole.

4. The large-caliber down-the-hole hammer ring seal packer according to claim 3, characterized in that: The annular component further includes airbag clamps provided at both ends of the inflatable airbag, the airbag clamps being fixedly connected to the annular component; The end of the inflatable airbag is bent outward to form a protruding edge, and a groove is arranged on the inner side of the airbag clamping ring to be engaged with the protruding edge of the end of the inflatable airbag.

5. The large-caliber down-the-hole hammer ring seal packer according to claim 1, characterized in that: The annular member is provided with a recess at one end facing the inflatable inner sleeve, and the two ends of the inflatable inner sleeve are respectively inserted into the recesses of the annular member; The outer diameter of the inflatable inner sleeve is adapted to the diameter of the end portion of the inflatable airbag.

6. The large-caliber down-the-hole hammer ring seal packer according to claim 3, characterized in that: A bearing static sleeve is provided on the outer side of the bearing movable sleeve at one end of the outer tube, and a locking component is provided on the end of the bearing static sleeve away from the bearing movable sleeve. The locking component is fixedly connected to the outer tube and is engaged with the bearing static sleeve. A pedestal is provided in the circumferential direction of the outer tube, and the pedestal supports the bearing movable sleeve at one end of the inflatable inner sleeve.

7. The large-caliber down-the-hole hammer ring seal packer according to claim 1, characterized in that: The inflatable inner sleeve is arranged beyond both ends of the inflatable airbag; Sealing elements are provided between both ends of the inflatable inner sleeve and the outer tube.

8. The large-caliber down-the-hole hammer ring seal packer according to claim 1, characterized in that: The interior of the outer tube includes a first section, a cylindrical section and a second section connected in sequence, and a distance is set between the first section and the second section. The first section is conical and the second section is annular. An expanded diameter section is provided at one end of the inner tube, and the expanded diameter section of the inner tube is adapted to the first section. The inner tube is also provided with an annular protruding section, and the annular protruding section of the inner tube can be stuck in the second section of the outer tube.

9. Large-caliber down-the-hole hammer ring seal guide type pneumatic reverse circulation forming device, characterized in that: A large-diameter down-the-hole hammer ring seal packer comprising the method of any one of claims 1 to 8, wherein the top ends of the inner and outer tubes are connected to the double-wall drill pipe, the bottom ends of the inner and outer tubes are connected to the diverter, the diverter is connected to the impactor, a central tube and an air supply channel are arranged inside the diverter, the bottom end of the central tube is closed, the central tube is connected to the slag discharge channel so that rock cuttings enter the central tube through the slag discharge channel and then enter the hollow part of the inner tube for slag discharge, and the compressed gas entering the double-wall drill pipe passes through the channel between the inner and outer tubes and then through the air supply channel to enter the impactor.

10. The operating method of the large-caliber down-the-hole hammer ring seal flow-guiding pneumatic reverse circulation forming device according to claim 9, characterized in that: Includes the following: The inner tube is inserted into the outer tube, an inflatable inner sleeve is provided in an annular direction on the outer tube and one end of the inflatable inner sleeve is limited, an inflatable airbag is sheathed on the outer side of the inflatable inner sleeve, and both ends of the inflatable airbag are fastened by the inflatable inner sleeve and the annular member, and the annular member is detachable relative to the outer tube; The outer tube is inserted into the drilled hole, and gas with a set pressure enters through the space between the inner tube and the outer tube, and enters the inflatable airbag through the air outlet hole of the outer tube and the through hole of the inflatable inner sleeve; The inflatable airbag is in full contact with the borehole wall to form a barrier; One end of the inner and outer tubes is connected to the double-wall drill pipe. The inner tube serves as a slag discharge channel. One end of the inner and outer tubes is connected to the impactor. The cuttings enter the center tube through the slag discharge channel of the diverter and then enter the hollow part of the inner tube for slag discharge. The compressed gas entering the double-wall drill pipe passes through the channel between the inner and outer tubes and then through the air supply channel to enter the impactor. After the working time is set, the inner tube and the outer tube are lifted out of the drilled hole, and the annular member is removed to replace the inflatable airbag.

Images