Rotary cycle anti-jam device

Abstract

This invention relates to the field of drilling fluid auxiliary circulation systems, specifically a rotary circulation anti-sticking device comprising a central pipe with an axial flow channel and a rotary casing. The invention features a reasonable and compact structure and is easy to use. In the event of a circulation system failure, it is first connected to the drilling platform pressure manifold via a pipe joint and a high-pressure water hose, and then connected to the wellhead drill string via the rotary casing, allowing the drilling fluid to quickly recirculate. Simultaneous rotation of the drill string at this time effectively prevents sand accumulation and stuck pipe or sticking. When stuck pipe or lost circulation occurs in a horizontal well section, the cable is first passed through this device and then connected to a string of tools such as detection tools, explosive release tools, or retrieval tools before being lowered into the well. It is then connected to the drilling platform pressure manifold via a union joint and a high-pressure water hose, allowing the high-pressure drilling fluid to propel the tool string forward to a predetermined position, completing the detection, deployment, and retrieval procedures.

Description

Technical Field

[0001] This invention relates to the field of drilling fluid auxiliary circulation system technology, and is a rotary circulation anti-sticking device. Background Technology

[0002] Stuck drill pipe is the most common and serious drilling accident in drilling engineering. If not handled properly, it will cause a huge waste of human, material and financial resources, and will endanger the personal safety of operators and the environment, seriously restricting the rapid development of drilling.

[0003] Sticky stuck pipe (also known as differential pressure stuck pipe) and sand-bridge stuck pipe (also known as sand bridge stuck pipe) are the most common and frequent types of stuck pipe accidents. Normally, due to filtration at the wellbore wall and the extremely low flow rate of drilling fluid (such as mud), solid particles in the mud are adsorbed and deposited on the wellbore wall, forming a mud cake. In the same open-hole section, the formation pore pressure gradient is not uniform, and the drilling fluid column pressure needs to balance the highest formation pore pressure in that section. For formations with relatively low pressure gradients, a positive pressure differential will inevitably form. However, when the drill string is stuck and stationary in the well, the side of the drill string closest to the wellbore wall (the sticky surface) experiences formation pore pressure transmitted through the mud cake, while the opposite side experiences drilling fluid column pressure. If the latter is greater than the former, i.e., a positive pressure differential exists, it will further press the drill string against the wellbore wall, further reducing the gap between the drill string and the mud cake. The increased adhesion between the drill string and the mud cake creates a dead zone (mud cake zone) on both sides of the contact surface between the drill string and the wellbore (mud cake), where drilling fluid cannot circulate. As the drill string remains stationary for longer periods, cuttings and solid particles in the mud slowly settle around the old mud cake, forming a new mud cake. Ultimately, this increases the contact area between the drill string and the wellbore, causing the drill string to become stuck. Simultaneously, the positive pressure differential increases the frictional resistance between the drill string and the mud cake. Therefore, in the initial stages of stuck drill string formation, methods such as lifting, pressing, rotating, and shock can be used to try to release the stuck drill string. Furthermore, when the drilling fluid stops flowing, solid particles within the fluid tend to settle and accumulate at the wellbore neck, forming a bridging blockage and causing sand buildup and stuck drill string. Therefore, once the hoisting system and / or drilling fluid circulation system malfunctions, the drilling fluid stops circulating and the drill string remains stationary, making it very easy for sticking or sand accumulation to occur. Reducing the stationary time of the downhole drill string and keeping the drilling fluid circulating smoothly can effectively reduce sand accumulation and sticking.

[0004] Chinese patent document CN109779547B discloses a downhole fluid flow reversing tool, which includes an upper connector, an outer sealing ring, an inner sealing ring, a transition short connector, a limiting locking block, an annular pressure cap, a first spring, a lower connector, and an inner sliding sleeve. Both ends of the upper connector and the lower connector are threaded. The ends of the upper and lower connectors that are close to each other are respectively threaded to both ends of the transition short connector. The outer sealing ring is fixedly connected to the inner wall of the upper connector. The inner sealing ring passes through the upper connector and the transition short connector. A groove is formed on the upper side wall of the transition short connector. The limiting locking block is built into the groove. The annular pressure cap is threadedly connected to the upper inner wall of the groove. The first spring is fixedly connected to the side wall of the annular pressure cap and the limiting locking block that are close to each other. The inner sliding sleeve... Inserted into a transition short connector, the lower sidewall of the transition short connector has a limiting groove. The inner sliding sleeve consists of an upper block and a lower block fixedly connected to the lower end of the upper block. The limiting locking block limits the upper block in the limiting groove. The inner sliding sleeve slides up and down in the vertical direction. One sidewall of the transition short connector has a liquid outlet channel. One sidewall of the inner sliding sleeve has a channel, and the shape and size of the channel are larger than the shape and size of the liquid outlet channel. During the up and down sliding of the inner sliding sleeve, the liquid outlet channel and the channel are interconnected. When the tool is inside the reversing working cylinder, the limiting locking block is constrained by the reversing working cylinder, restricting the inner sliding sleeve from moving upward. After the tool exits the reversing working cylinder, the limiting locking block is no longer constrained by the reversing working cylinder and pops out under the elastic force of the first spring, simultaneously releasing the limiting effect on the inner sliding sleeve. The inner sliding sleeve moves upward under the action of pressure difference. It uses a reversing working cylinder to limit the inner sliding sleeve. During the process of lowering the tubing, the pressure difference causes the channel on the inner sliding sleeve to be misaligned with the liquid outlet channel in the transition short connection, automatically changing the liquid flow direction and completing the reversing circulation function. During the sand flushing process, the oil pipe can be connected to flush the sand without stopping the pump, which can effectively avoid sand settling and drill jamming accidents caused by stopping the pump.

[0005] Therefore, the existing drilling fluid circulation system has the following shortcomings in actual use: once the hoisting and drilling fluid circulation system fails, if the drilling fluid circulation system cannot be rebuilt in a timely and effective manner, it will be very easy for sand to settle and the drill bit to get stuck or for the drill bit to get stuck due to adhesion; after a stuck drill or well leakage occurs in the horizontal section, the forward power of the fishing tools and the measurement while drilling (MWD) instruments is insufficient, making it difficult to reach the predetermined position. Summary of the Invention

[0006] This invention provides a rotary circulation anti-jamming device that overcomes the shortcomings of the prior art. It can effectively solve the problem that if the existing drilling fluid circulation system fails during actual use, sand accumulation jamming or sticking jamming accidents will easily occur if the drilling fluid circulation system cannot be rebuilt in a timely and effective manner once it is lifted.

[0007] This invention further solves the problem that when a stuck drill or lost circulation occurs in a horizontal well section, the retrieval tools and MWD instruments lack sufficient forward momentum, making it difficult to reach the intended position.

[0008] The technical solution of the present invention is achieved through the following measures: a rotary circulation anti-jamming device, comprising a central tube with an axial flow channel and a rotary sleeve, the lower end of the rotary sleeve being provided with a drill bit connection groove, the inner side of the lower part of the rotary sleeve being provided with a limiting inner ring platform, the rotary sleeve corresponding to the upper position of the limiting inner ring platform being provided with a central tube with its upper end located above the rotary sleeve, the inner side of the upper part of the rotary sleeve being provided with a first inner ring groove, the inner side of the upper part of the first inner ring groove being threadedly installed with a T-shaped pressure cap fitted on the outer side of the middle part of the central tube, the inner side of the lower part of the first inner ring groove being provided with a blocking ring whose upper end abuts against the lower side of the T-shaped pressure cap, the inner side of the blocking ring being threadedly installed together with the outer side of the lower part of the central tube; a pipe joint being installed on the outer side of the upper end of the central tube.

[0009] The following are further optimizations and / or improvements to the above-mentioned technical solution:

[0010] The above may also include a sealing cap, a core support, a sealing core, a U-shaped pressure block, a sealing gasket, and a union joint. The pipe joint is a tee joint. The lower end of the tee joint has a second inner ring groove on its inner side, and the inner side of the second inner ring groove is threaded to the outer side of the upper end of the central pipe. The upper end of the tee joint has a sealing cap threaded to its outer side. The upper part of the upper tee joint has a third inner ring groove on its inner side. The third inner ring groove contains, from bottom to top, a core support, a sealing core, and a sealing cap that connects to the sealing cap at its upper end. The inner sides of the T-shaped pressure blocks abut against each other. The sealing cap corresponding to the position of the T-shaped pressure block has a first through hole with a size matching the outer diameter of the upper end of the T-shaped pressure block and extending vertically. A sealing gasket that can block the first through hole is provided between the inner side of the upper end of the sealing cap and the upper end of the T-shaped pressure block. The T-shaped pressure block, sealing core and core support corresponding to the position of the first through hole have a second through hole, a third through hole and a fourth through hole respectively. The left end of the left connector of the tee joint has a union connector on its outer side.

[0011] The aforementioned core support may include a left core support and a right core support with opposite openings and symmetrical left and right; the sealing core may include a left core and a right core with opposite openings and symmetrical left and right, and the sealing core has at least two telescopic inner ring grooves spaced axially in the middle, and the upper end of the sealing core is a frustum-shaped cone with a smaller upper end and a larger lower end; the T-shaped pressure block may include a left pressure block and a right pressure block with opposite openings and symmetrical left and right, and the lower end of the T-shaped pressure block has an arc-shaped groove with an opening facing downwards.

[0012] The above may further include a first sealing ring, a second sealing ring, a packing assembly, a first thrust bearing, and a third sealing ring. At least one first sealing ring is provided vertically between the outer side of the upper end of the central tube and the inner side of the lower part of the pipe joint. At least one second sealing ring is provided vertically between the inner side of the upper end of the rotating sleeve and the outer side of the upper part of the T-shaped gland. A sealing inner ring groove is provided on the inner side of the rotating sleeve corresponding to the lower side of the blocking ring. A packing assembly capable of forming a dynamic seal with the outer side of the lower part of the central tube is provided in the sealing inner ring groove. A first thrust bearing is provided between the upper side of the packing assembly and the lower side of the blocking ring. A third sealing ring is provided between the lower side of the packing assembly and the rotating sleeve.

[0013] The aforementioned packing assembly may include a packing cover, a lower packing seat, a middle packing seat, and packing. A packing cover is provided in the sealing ring groove corresponding to the lower position of the first thrust bearing. A lower packing seat is provided on the inner side of the lower end of the inner sealing ring groove. At least one middle packing seat is provided vertically between the packing cover and the lower packing seat. A first ring groove with an opening facing downward is provided on the lower side of the packing cover. A second ring groove is provided on the lower side of each middle packing seat corresponding to the position of the first ring groove. A first inner packing ring groove is provided on the inner side of the upper end of each middle packing seat. A second inner packing ring groove is provided on the inner side of the upper end of the lower packing seat corresponding to the position of the first inner packing ring groove. Packing is provided between the second inner packing ring groove and the second ring groove above it, between adjacent second ring grooves and the first inner packing ring groove, and between the first ring groove and the first inner packing ring groove below it.

[0014] The above may also include a second thrust bearing, which is provided between the lower side of the T-shaped cap and the upper side of the blocking ring.

[0015] The outer side of the upper part of the sealing gland, the outer side of the center tube between the lower side of the corresponding pipe joint and the upper side of the T-shaped gland, the outer side of the upper end of the T-shaped gland, the outer side of the middle part of the rotating sleeve, and the outer side of the middle part of the blocking ring may be provided with a first wrench position, a second wrench position, a third wrench position, a fourth wrench position, and a fifth wrench position, respectively.

[0016] The above may further include a first set screw, a second set screw, and a third set screw. The lower end of the pipe joint is provided with at least one through-hole along the circumference. The outer side of the upper end of the central tube corresponding to each first threaded hole is provided with an outward-facing first locking hole. Each first locking hole is provided with a first set screw whose outer end is located in the first threaded hole. The upper end of the rotating sleeve is provided with at least one through-hole along the circumference. The outer side of the T-shaped cap corresponding to each second threaded hole is provided with an outward-facing second locking hole. Each second locking hole is provided with a second set screw whose outer end is located in the second threaded hole. The lower end of the blocking ring is provided with at least one through-hole along the circumference. The outer side of the central tube corresponding to each third threaded hole is provided with an outward-facing third locking hole. Each third locking hole is provided with a third set screw whose outer end is located in the third threaded hole.

[0017] This invention features a reasonable and compact structure, making it easy to use. When the circulation system fails, it first connects to the drilling platform pressure manifold via a pipe joint and a high-pressure water hose, and then connects to the wellhead drill string via a rotating casing, allowing the drilling fluid to quickly recirculate. At this time, synchronous rotation of the drill string can effectively prevent sand accumulation and stuck drill bit or sticking drill bit. In addition, static and dynamic sealing can be achieved through various sealing rings and packing components, thereby preventing drilling fluid from seeping out from various gaps. The use of two thrust bearings at the top and bottom can make the rotating casing rotate more smoothly and steadily. When stuck drill bit or well leakage occurs in the horizontal well section, the cable is first passed through this device and then connected to the detection tool, explosive release tool, or retrieval tool, etc., and then lowered into the well. It is then connected to the drilling platform pressure manifold via a union joint and a high-pressure water hose, allowing the high-pressure drilling fluid to push the tool string forward to the predetermined position, completing the detection, deployment, retrieval, and other accident handling work. Attached Figure Description

[0018] Appendix Figure 1 This is a schematic diagram of the main view partial cross-sectional structure of Embodiments 1-8 of the present invention.

[0019] Appendix Figure 2 For the appendix Figure 1 A three-dimensional structural diagram showing the T-junction, sealing cap, and T-shaped pressure block in use.

[0020] Appendix Figure 3 For the appendix Figure 1 A three-dimensional structural diagram of the central tube.

[0021] Appendix Figure 4 For the appendix Figure 1 A magnified front sectional view of the packing assembly.

[0022] The codes in the attached diagram are as follows: 1 for center tube, 2 for rotating sleeve, 3 for drill string connection groove, 4 for limiting inner annular platform, 5 for T-type gland, 6 for blocking ring, 7 for pipe joint, 8 for sealing cap, 9 for sealing gasket, 10 for union joint, 11 for lower joint, 12 for upper joint, 13 for first through hole, 14 for second through hole, 15 for third through hole, 16 for fourth through hole, 17 for left joint, 18 for left core support, 19 for right core support, 20 for left rubber core, 21 for right rubber core, 22 for telescopic inner annular groove, 23 for left pressure block, 24 for right pressure block, 25 for... Arc-shaped groove, 26 is the first sealing ring, 27 is the second sealing ring, 28 is the first thrust bearing, 29 is the third sealing ring, 30 is the packing cover, 31 is the lower packing seat, 32 is the middle packing seat, 33 is the packing, 34 is the first annular groove, 35 is the second annular groove, 36 is the inner annular groove of the first packing, 37 is the inner annular groove of the second packing, 38 is the second thrust bearing, 39 is the first wrench position, 40 is the second wrench position, 41 is the third wrench position, 42 is the fifth wrench position, 43 is the first set screw, 44 is the second set screw, and 45 is the third set screw. Detailed Implementation

[0023] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0024] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0025] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0026] Example 1: As shown in the attached document Figure 1 , 2 As shown in Figure 3, the rotating circulation anti-jamming device includes a central tube 1 with an axial flow channel and a rotating sleeve 2. The lower end of the rotating sleeve 2 is provided with a drill bit connection groove 3. The inner side of the lower part of the rotating sleeve 2 is provided with a limiting inner ring platform 4. The rotating sleeve 2, corresponding to the upper position of the limiting inner ring platform 4, is provided with a central tube 1 with its upper end located above the rotating sleeve 2. The inner side of the upper part of the rotating sleeve 2 is provided with a first inner ring groove. The inner side of the upper part of the first inner ring groove is threadedly installed with a T-shaped pressure cap 5 fitted on the outer side of the middle part of the central tube 1. The inner side of the lower part of the first inner ring groove is provided with a blocking ring 6 whose upper end abuts against the lower side of the T-shaped pressure cap 5. The inner side of the blocking ring 6 is threadedly installed with the outer side of the lower part of the central tube 1. A pipe joint 7 is installed on the outer side of the upper end of the central tube 1.

[0027] As needed, the device can be quickly connected to the drilling platform pressure manifold using a high-pressure water hose via pipe connector 7. In this embodiment, pipe connector 7 can be implemented using existing straight connectors, elbows, or tee connectors with one end sealed. Pipe connector 7 and the central pipe 1 can be connected by threads. Furthermore, to prevent pipe connector 7 from rotating along with the rotating casing 2 when the drill string rotates, causing the high-pressure water hose to become entangled or coiled, pipe connector 7 can be fixed to the drilling platform using cables, wire ropes, or clamps. Connecting pipe connector 7 and rotating casing 2 via the central pipe 1 allows drilling fluid to flow within rotating casing 2 and also allows the rotating casing to... The casing 2 rotates with the drill string, allowing the drilling fluid to recirculate downhole and enabling the drill string to rotate continuously or periodically (the drill string is usually required to remain stationary downhole for no more than three minutes). This effectively prevents the deposition of solid particles in the mud, thus avoiding stuck pipe or sand accumulation. The retaining ring 6 and the T-shaped gland 5 effectively prevent the rotating casing 2 from detaching from the central casing 1 during rotation. The drill string connection groove 3 is used to connect to the wellhead drill string and can be located either on the outer side of the lower end of the rotating casing 2 or on the inner side of the lower end of the rotating casing 2 (depending on the type of drill string connector). The thread type inside the groove matches the thread type of the wellhead drill string connector.

[0028] During use, when the drilling fluid circulation system malfunctions (such as pipe flushing and leakage), first assemble the wellhead drill string and the rotating casing 2 together through the drill string connection groove 3, then connect the pipe joint 7 and the pressure manifold on the drilling platform with a high-pressure water hose, then tie and fix the pipe joint 7 to the drilling platform, and finally turn the mud pump back on. The drilling fluid can then connect with the downhole drill string along the high-pressure water hose, pipe joint 7, central pipe 1, and rotating casing 2, and circulate again to replenish the downhole drilling fluid filtration loss. At this time, periodically or continuously rotating the drill string can carry the drilling fluid into the gap between the drill string and the mud cake, preventing dead zones and effectively preventing sand accumulation, stuck drill bit or sticking drill bit.

[0029] The invention has a reasonable and compact structure and is easy to use. When the circulation system fails, it is first connected to the pressure manifold of the drilling platform through the pipe joint 7 and the high-pressure water hose, and then connected to the wellhead drill string through the rotating casing 2, so that the drilling fluid can be recirculated. At this time, the synchronous rotation of the drill string can effectively prevent sand from getting stuck or sticking to the drill string.

[0030] The above-mentioned rotating circulation anti-jamming device can be further optimized and / or improved according to actual needs:

[0031] Example 2: As shown in the attached document Figure 1 , 2 As shown, it also includes a sealing cap 8, a core support, a sealing core, a U-shaped pressure block, a sealing gasket 9, and a union joint 10. The pipe joint 7 is a tee joint. The lower end of the tee joint has a second inner ring groove on its inner side. The inner side of the second inner ring groove is threaded to the outer side of the upper end of the central pipe 1. The upper end of the upper joint 12 of the tee joint has a sealing cap threaded to its outer side. The upper inner side of the upper part of the tee joint 12 has a third inner ring groove. The third inner ring groove contains, from bottom to top, a core support, a sealing core, and a sealing gasket that is connected to the inner side of the upper end of the sealing cap. The T-shaped pressure block has a first through hole 13 on the sealing cap corresponding to the position of the T-shaped pressure block. The size of the sealing cap matches the outer diameter of the upper end of the T-shaped pressure block and is vertically connected. A sealing gasket 9 is provided between the inner side of the upper end of the sealing cap and the upper end of the T-shaped pressure block to block the first through hole 13. The T-shaped pressure block, sealing core and core support corresponding to the position of the first through hole 13 are respectively provided with a second through hole 14, a third through hole 15 and a fourth through hole 16 vertically connected. The left connector 17 of the tee connector has a union connector 10 on the outer side of the left end.

[0032] Depending on the requirements, the sealing gasket 9 and the sealing core can be made of elastic materials such as rubber, silicone, or polyurethane rubber, as is available in existing technologies. The sealing gasket 9 is used to seal the first through hole 13 when no fishing tool is installed, preventing drilling fluid from flowing out of the first through hole 13 and restoring downhole water circulation. It can be removed when the cable is in use and reinstalled after use. The inner diameters of the second through hole 14, third through hole 15, and fourth through hole 16 should match the outer diameter of the cable so that the cable can pass through normally and form a dynamic seal with the sealing core. The core support functions similarly to the sealing ring in existing technologies, protecting and supporting the sealing core. The steps on the U-shaped pressure block allow for a more even distribution of pressure from the pressure cap compressing the sealing core. The deformation of the sealing core is made more uniform, resulting in a better sealing effect. To prevent excessive changes in drilling fluid pressure from affecting the service life of this device (erosion wear), the inner diameters of the flow channels in the tee joint, the axial flow channel of the central tube 1, and the flow channel on the inner side of the lower end of the rotating sleeve 2 should be similar. In this embodiment, the inner diameters of the above flow channels are made equal by setting corresponding inner ring grooves. In this embodiment, the union joint 10 can use the existing 1502 type union joint. The matching high-pressure water hose is equipped with a quick-connect fitting of the same model as the 1502 type union joint to ensure that the two can be quickly assembled together. The use of union joint 10 in this embodiment is mainly due to its advantages of reliable sealing, quick installation and removal, and good interchangeability.

[0033] During use, when the drill gets stuck, first unscrew the sealing cap and remove the sealing gasket 9, the T-shaped pressure block, the sealing core, and the core support. Then, pass the cable sequentially through the first through hole 13, the second through hole 14, the third through hole 15, the fourth through hole 16, the inner sides of the upper and lower joints of the tee connector, the inner side of the central tube 1, and the lower inner side of the rotating sleeve 2. Connect the cable to the retrieval tool, the explosive loosening tool, the testing tool, and other tools. Then, insert the core support, the sealing core, and the T-shaped pressure block back into the third inner ring groove. Finally, reinstall the sealing cap at the top of the tee connector and ensure the sealing is secure. The inner side of the upper end of the sealing cap abuts against the stepped surface of the upper part of the T-shaped pressure block. Then, the sealing cap is rotated to further compress the sealing core through the T-shaped pressure block. This ensures that the sealing core can reliably seal the gap between the upper connector 12 of the tee and the cable without affecting the normal movement of the cable. Then, one end of the high-pressure water hose is connected to the pressure manifold of the drilling platform, and the other end is connected to the union connector 10. Then, the fishing tool, explosive release tool, detection tool, and other tools are lowered into the well. Finally, the mud pump on the drilling platform is turned on (in this embodiment, the mud pump discharge can be set to 4-6 L / S) to allow the drilling fluid to flow again. When the pressurized drilling fluid impacts the end face of the fishing tool, explosive release tool, or MWD instrument, it will generate a certain propulsion force to move the fishing tool, explosive release tool, or MWD instrument to the predetermined position in the horizontal well section, so as to complete the accident handling work such as fishing, deployment, and detection. In addition, since it is absolutely forbidden for the sealing core to clamp the cable during normal use, which would prevent the cable from being lowered and moved normally, and it is difficult to control the compression of the sealing core to both ensure smooth cable lowering and prevent any leakage of drilling fluid, a small amount of mud leakage is permissible during actual use.

[0034] Example 3: As shown in the attached document Figure 1 , 2As shown, the core support includes a left core support 18 and a right core support 19 with openings opposite each other and symmetrical; the sealing core includes a left core 20 and a right core 21 with openings opposite each other and symmetrical, and the middle of the sealing core is provided with at least two telescopic inner ring grooves 22 spaced apart along the axial direction, and the upper end of the sealing core is a frustum-shaped cone with a smaller upper end and a larger lower end; the T-shaped pressure block includes a left pressure block 23 and a right pressure block 24 with openings opposite each other and symmetrical, and the lower end of the T-shaped pressure block is provided with an arc-shaped groove 25 with an opening facing downward. With this configuration, the left core support 18 and right core support 19, the left rubber core 20 and right rubber core 21, and the left pressure block 23 and right pressure block 24 can all be quickly and easily wrapped around or removed from the cable from both sides, eliminating the need to pull the cable. This effectively reduces wear between the cable and the sealing rubber core, extends the service life of the sealing rubber core, reduces costs, and improves the efficiency of disassembly and assembly. In addition, the telescopic inner ring groove 22 on the rubber core provides more compression space for the rubber core, which can better achieve the sealing effect between the rubber core and the outside of the cable. The cone at the upper end of the sealing rubber core matches the arc groove 25 at the lower end of the T-shaped pressure block, which can reserve enough deformation space for the sealing rubber core to achieve a better sealing effect.

[0035] Example 4: As shown in the appendix Figure 1 , 4 As shown, it also includes a first sealing ring 26, a second sealing ring 27, a packing assembly, a first thrust bearing 28, and a third sealing ring 29. At least one first sealing ring 26 is provided vertically between the outer side of the upper end of the central tube 1 and the inner side of the lower part of the pipe joint 7; at least one second sealing ring 27 is provided vertically between the inner side of the upper end of the rotating sleeve 2 and the outer side of the upper part of the T-shaped gland 5; a sealing inner ring groove is provided on the inner side of the rotating sleeve 2 corresponding to the lower side of the blocking ring 6, and a packing assembly that can form a dynamic seal with the outer side of the lower part of the central tube 1 is provided in the sealing inner ring groove. A first thrust bearing 28 is provided between the upper side of the packing assembly and the lower side of the blocking ring 6, and a third sealing ring 29 is provided between the lower side of the packing assembly and the rotating sleeve 2.

[0036] As required, the first sealing ring 26 is used to prevent drilling fluid from seeping out from the gap between the central tube 1 and the pipe joint 7. In this embodiment, the first sealing ring 26 can be implemented using an O-ring and its matching sealing ring in the prior art. The second sealing ring 27 is used to prevent drilling fluid from seeping out from the gap between the rotating casing 2 and the T-type gland 5. In this embodiment, the second sealing ring 27 can be implemented using an O-ring in the prior art. When the drill string drives the rotating casing 2 to rotate, the packing assembly is used to achieve a dynamic seal between the rotating casing 2 and the central tube 1, preventing drilling fluid from seeping out from the central tube. The gap between the packing assembly and the rotating sleeve 2 prevents the drilling fluid from leaking out of the device; the third sealing ring 29 is used to seal the packing assembly and the rotating sleeve 2, preventing drilling fluid from leaking out from the gap between the lower end face of the packing assembly and the lower end face of the sealing inner ring groove. In this embodiment, the third sealing ring 29 can be achieved by existing O-rings, rectangular rings, or star-shaped rings; the first thrust bearing 28 can effectively reduce the wear between the upper side of the packing assembly and the lower side of the blocking ring 6, extend the service life, reduce costs, and make the rotating sleeve 2 rotate more smoothly and stably around the central tube 1.

[0037] Example 5: As shown in the attached document Figure 1 , 4 As shown, the packing assembly includes a packing cover 30, a lower packing seat 31, a middle packing seat 32, and packing 33. The packing cover 30 is located within the sealing ring groove corresponding to the lower side of the first thrust bearing 28. The lower packing seat 31 is located on the inner side of the lower end of the inner sealing ring groove. At least one middle packing seat 32 is spaced vertically between the packing cover 30 and the lower packing seat 31. The lower side of the packing cover 30 has a downward-opening first annular groove 34. Each middle packing seat 33 corresponds to a position in the first annular groove 34. 2. A second annular groove 35 is provided on the lower side. A first packing inner annular groove 36 is provided on the inner side of the upper end of each middle packing seat 32. A second packing inner annular groove 37 is provided on the inner side of the upper end of the lower packing seat 31 corresponding to the position of the first packing inner annular groove 36. Packing 33 is provided between the second packing inner annular groove 37 and the second annular groove 35 above it, between adjacent second annular grooves 35 and the first packing inner annular groove 36, and between the first annular groove 34 and the first packing inner annular groove 36 below it.

[0038] With this configuration, multiple packing rings 33 achieve rotational sealing between the rotating casing 2 and the central tube 1, resulting in a better sealing effect and more effectively preventing drilling fluid from seeping out from the gap between the central tube 1 and the rotating casing 2. Depending on the requirements, the packing rings 33 can be implemented using woven fibers, vulcanized rubber sealing rings, and matching retaining rings. To prevent excessive friction between the central tube 1 and the packing rings 33 during the rotation of the rotating casing 2, which could affect the service life of the packing rings 33, the outer surface of the central tube 1 corresponding to the packing assembly location in this embodiment needs to be chrome-plated and polished.

[0039] Example 6: As shown in the appendix Figure 1As shown, it also includes a second thrust bearing 38, which is provided between the lower side of the T-shaped cap 5 and the upper side of the blocking ring 6. With this arrangement, when the rotating sleeve 2 rotates, the second thrust bearing 38 can reduce the friction between the lower end of the T-shaped cap 5 and the upper side of the blocking ring 6, reduce the wear between the T-shaped cap 5 and the blocking ring 6, and also make the rotating sleeve 2 rotate more smoothly around the central tube 1 and reduce resistance.

[0040] Example 7: As attached Figure 1 , 2 As shown in Figure 3, the outer side of the center tube 1, the outer side of the upper part of the sealing gland, the outer side of the corresponding pipe joint 7, the upper side of the T-shaped gland 5, the outer side of the upper end of the T-shaped gland 5, the outer side of the middle part of the rotating sleeve 2, and the outer side of the middle part of the blocking ring 6 are respectively provided with a first wrench position 39, a second wrench position 40, a third wrench position 41, a fourth wrench position, and a fifth wrench position 42.

[0041] This design allows for easier and faster assembly, disassembly, or connection of the various components of the device to drilling tools using a wrench. Depending on requirements, the first wrench position 39, the second wrench position 40, the third wrench position 41, and the fourth wrench position can all be achieved using existing known technologies such as a drum-shaped wrench groove, a square wrench table, a square wrench groove, a hexagonal wrench groove, a hexagonal wrench table, or wrench holes evenly distributed around the circumference and opening outwards. The fifth wrench position 42 can be achieved using existing technologies such as wrench holes evenly distributed around the circumference of the retaining ring 6 and opening outwards.

[0042] Example 8: As attached Figure 1 As shown, it also includes a first set screw 43, a second set screw 44, and a third set screw 45. The lower end of the pipe joint 7 is provided with at least one through-hole along the circumference. The outer side of the upper end of the central tube 1 corresponding to each first threaded hole position is provided with an outward-facing first locking hole. Each first locking hole is provided with a first set screw 43 whose outer end is located in the first threaded hole. The upper end of the rotating sleeve 2 is provided with at least one through-hole along the circumference. The outer side of the T-shaped cap 5 corresponding to each second threaded hole position is provided with an outward-facing second locking hole. Each second locking hole is provided with a second set screw 44 whose outer end is located in the second threaded hole. The lower end of the blocking ring 6 is provided with at least one through-hole along the circumference. The outer side of the central tube 1 corresponding to each third threaded hole position is provided with an outward-facing third locking hole. Each third locking hole is provided with a third set screw 45 whose outer end is located in the third threaded hole.

[0043] With this configuration, when the rotating sleeve 2 rotates, the first set screw 43 can fix the relative position between the pipe joint 7 and the central tube 1, the second set screw can fix the relative position between the rotating sleeve 2 and the T-shaped cap 5, and the third set screw 45 can fix the relative position between the blocking ring 6 and the central tube 1, effectively preventing the threads between the pipe joint 7 and the central tube 1, between the rotating sleeve 2 and the T-shaped cap 5, and between the blocking ring 6 and the central tube 1 from loosening.

[0044] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A rotary circulation anti-jamming device, characterized in that The utility model provides a kind of drilling tool, including the central tube with axial flow channel and rotating sleeve, rotating sleeve lower end is equipped with drilling tool connecting groove, rotating sleeve lower inner side is equipped with limit inner ring table, corresponding limit inner ring table upper side position rotating sleeve is equipped with the central tube with upper end being located above rotating sleeve, rotating sleeve upper inner side is equipped with first inner ring groove, first inner ring groove upper inner side is equipped with T-shaped gland by screw thread installation in central tube middle outer side, first inner ring groove lower inner side is equipped with the blocking ring with upper end and T-shaped gland lower side, blocking ring inner side is installed together by screw thread with central tube lower outer side;Central tube upper end outer side is equipped with pipe joint.

2. The rotary circulation anti-jamming device according to claim 1, characterized in that It also includes a sealing cover, a core holder, a sealing rubber core, a X-shaped pressing block, a plugging pad and a N-shaped joint. The pipe joint is a tee joint. The lower joint of the tee joint is equipped with a second inner ring groove on its inner side. The second inner ring groove is installed together with the outer side of the upper end of the central tube by screw thread. The upper joint of the tee joint is equipped with a sealing gland on its outer side by screw thread. The upper joint of the tee joint is equipped with a third inner ring groove on its inner side. The third inner ring groove is sequentially equipped with a core holder, a sealing rubber core and a X-shaped pressing block from bottom to top. The sealing gland is equipped with a first through hole on its upper end inner side that matches the size of the outer diameter of the upper end of the X-shaped pressing block. A plugging pad is arranged between the upper end inner side of the sealing gland and the upper end of the X-shaped pressing block to block the first through hole. The X-shaped pressing block, the sealing rubber core and the core holder are sequentially equipped with a second through hole, a third through hole and a fourth through hole from top to bottom. The left joint of the tee joint is equipped with a N-shaped joint on its outer side.

3. The rotary circulation anti-jamming device according to claim 2, characterized in that The core holder includes a left core holder and a right core holder that are opposite and left-right symmetrical. The sealing rubber core includes a left rubber core and a right rubber core that are opposite and left-right symmetrical. At least two telescopic inner ring grooves are arranged in the middle of the sealing rubber core along the axial direction. The upper end of the sealing rubber core is in the shape of a tapered cone that is small at the top and large at the bottom. The X-shaped pressing block includes a left pressing block and a right pressing block that are opposite and left-right symmetrical. The lower end of the X-shaped pressing block is equipped with an arc-shaped groove with the opening facing downward.

4. The anti-jamming device of claim 1 or 2 or 3, wherein It also includes a first sealing ring, a second sealing ring, a packing assembly, a first thrust bearing and a third sealing ring. At least one first sealing ring is arranged between the outer side of the upper end of the central tube and the inner side of the lower part of the pipe joint. At least one second sealing ring is arranged between the inner side of the upper end of the rotating sleeve and the outer side of the upper part of the T-shaped gland. A sealing inner ring groove is arranged on the inner side of the rotating sleeve corresponding to the lower side of the blocking ring. A packing assembly is arranged in the sealing inner ring groove to form a dynamic seal with the outer side of the lower part of the central tube. A first thrust bearing is arranged between the upper side of the packing assembly and the lower side of the blocking ring. A third sealing ring is arranged between the lower side of the packing assembly and the rotating sleeve.

5. The rotary circulation anti-jamming device according to claim 4, characterized in that The packing assembly comprises a packing cover, a lower packing seat, a middle packing seat and a packing, a packing cover is arranged in a sealing ring groove corresponding to a first thrust bearing lower side position, a lower packing seat is arranged in an inner side of a lower end of the sealing inner ring groove, at least one middle packing seat is arranged between the packing cover and the lower packing seat in an up-down interval; a first ring groove with an opening downward is arranged in a lower side of the packing cover, a second ring groove is arranged in a lower side of each middle packing seat corresponding to the position of the first ring groove, a first packing inner ring groove is arranged in an inner side of an upper end of each middle packing seat, a second packing inner ring groove is arranged in an inner side of an upper end of the lower packing seat corresponding to the position of the first packing inner ring groove, and the second packing inner ring groove, the second ring groove above the second packing inner ring groove, the first packing inner ring groove between adjacent second ring grooves and the first ring groove and the first packing inner ring groove below the first ring groove are all provided with the packing.

6. The anti-jamming device of claim 1 or 2 or 3 or 5, wherein The second thrust bearing is further arranged between the lower side of the T-shaped gland and the upper side of the blocking ring.

7. The rotary circulation anti-jamming device according to claim 4, characterized in that The second thrust bearing is further arranged between the lower side of the T-shaped gland and the upper side of the blocking ring.

8. The rotary circulation anti-jamming device according to claim 1 or 2 or 3 or 5 or 7, characterized in that A first wrench position, a second wrench position, a third wrench position, a fourth wrench position and a fifth wrench position are respectively arranged in a position between the outer side of the upper part of the sealing gland, the lower side of the pipe joint and the upper side of the T-shaped gland, the outer side of the center pipe, the outer side of the upper end of the T-shaped gland, the outer side of the middle part of the rotating sleeve and the outer side of the middle part of the blocking ring; or / and the first locking hole, the second locking hole and the third locking hole are further arranged, at least one first threaded hole penetrating in and out is arranged in the circumferential direction of the lower end of the pipe joint, a first locking hole with an opening outward is arranged in the outer side of the upper end of the center pipe corresponding to the position of each first threaded hole, and a first locking screw with an outer end located in the first threaded hole is arranged in each first locking hole; at least one second threaded hole penetrating in and out is arranged in the circumferential direction of the upper end of the rotating sleeve, a second locking hole with an opening outward is arranged in the outer side of the T-shaped gland corresponding to the position of each second threaded hole, and a second locking screw with an outer end located in the second threaded hole is arranged in each second locking hole; at least one third threaded hole penetrating in and out is arranged in the circumferential direction of the lower end of the blocking ring, a third locking hole with an opening outward is arranged in the outer side of the center pipe corresponding to the position of each third threaded hole, and a third locking screw with an outer end located in the third threaded hole is arranged in each third locking hole.

9. The rotary circulation anti-jamming device according to claim 4, characterized in that The outer side of the upper part of the sealing gland, the outer side of the upper end of the T-shaped gland, the outer side of the middle part of the rotating sleeve, and the outer side of the middle part of the blocking ring are respectively provided with a first wrench position, a second wrench position, a third wrench position, a fourth wrench position, and a fifth wrench position; or / and further comprising a first tightening screw, a second tightening screw, and a third tightening screw, the lower end of the pipe joint is provided with at least one first screw hole penetrating in and out along the circumference, the outer side of the upper end of the central pipe is provided with a first locking hole opening outward corresponding to the position of each first screw hole, and the first locking hole is provided with the first tightening screw with the outer end located in the first screw hole; the upper end of the rotating sleeve is provided with at least one second screw hole penetrating in and out along the circumference, the outer side of the T-shaped gland is provided with a second locking hole opening outward corresponding to the position of each second screw hole, and the second locking hole is provided with the second tightening screw with the outer end located in the second screw hole; the lower end of the blocking ring is provided with at least one third screw hole penetrating in and out along the circumference, the outer side of the central pipe is provided with a third locking hole opening outward corresponding to the position of each third screw hole, and the third locking hole is provided with the third tightening screw with the outer end located in the third screw hole.

10. The rotary circulation anti-jamming device according to claim 6, characterized in that The outer side of the upper part of the sealing gland, the outer side of the upper end of the T-shaped gland, the outer side of the middle part of the rotating sleeve, and the outer side of the middle part of the blocking ring are respectively provided with a first wrench position, a second wrench position, a third wrench position, a fourth wrench position, and a fifth wrench position; or / and further comprising a first tightening screw, a second tightening screw, and a third tightening screw, the lower end of the pipe joint is provided with at least one first screw hole penetrating in and out along the circumference, the outer side of the upper end of the central pipe is provided with a first locking hole opening outward corresponding to the position of each first screw hole, and the first locking hole is provided with the first tightening screw with the outer end located in the first screw hole; the upper end of the rotating sleeve is provided with at least one second screw hole penetrating in and out along the circumference, the outer side of the T-shaped gland is provided with a second locking hole opening outward corresponding to the position of each second screw hole, and the second locking hole is provided with the second tightening screw with the outer end located in the second screw hole; the lower end of the blocking ring is provided with at least one third screw hole penetrating in and out along the circumference, the outer side of the central pipe is provided with a third locking hole opening outward corresponding to the position of each third screw hole, and the third locking hole is provided with the third tightening screw with the outer end located in the third screw hole.

Images