A drill for directional long hole drilling

Abstract

The application relates to the technical field of drilling equipment, and particularly discloses a drilling tool for directional long drilling holes; the drilling tool comprises a drill rod and a coupling, and the coupling is in through butt joint with the drill rod in the axial direction; the coupling comprises: a butt joint shell in a split structure of two butt joint seals, and the two ends can be detachably fixedly connected with the drill rod; and a damping structure is fixedly arranged in the butt joint shell; the coupling can achieve the effects of vibration isolation, filtering and damping weakening between the drill rods, the problem that the damping effect is poor by additionally assembling damping auxiliary equipment in the prior art is solved, the proportion of vibration transmission along the drill rod can be effectively reduced, the drilling tool equipment can be maintained, the construction efficiency can be ensured, and the drilling construction quality under a complex geological environment can be improved, and in particular, the safety risk and the probability of accidents can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drilling equipment, and particularly discloses a drilling tool for directional long borehole. BACKGROUND

[0002] In the field of oil and gas drilling, when oil and gas reservoirs are distributed in complex geological structures such as faults and salt domes, or are relatively dispersed, or belong to special oil and gas reservoirs such as deep shale gas, or are located on the ground and need to avoid obstacles to reduce the impact on the surrounding environment, or, from the perspective of long-term opening of oil and gas reservoirs, in order to improve the comprehensive opening benefit and ultimate recovery rate of oil and gas fields, it is reasonable and common to use directional long borehole as a drilling method for oil and gas exploitation. Directional long borehole refers to a borehole that is usually controlled by human direction and presents a non-vertical and long-distance borehole trajectory, and generally includes trajectory types such as inclined drilling, horizontal drilling and composite trajectory drilling. In the process of fracturing drilling for oil and gas exploitation, the combination of vertical drilling and directional long borehole drilling can complete the channeling, and after the drilling channel is reinforced, channel perforation can be performed, and finally, fracturing fluid is added to support the oil and gas channel, so as to realize the full release of oil and gas and improve the recovery rate.

[0003] The drilling tool for directional long borehole is a drilling tool specially designed for directional long borehole, which generally consists of a drill bit, a power device, a guide control tool, a drill rod system, a measurement and guide tool, and auxiliary tools.

[0004] In actual drilling construction, especially in complex hard geological structures, the drilling tool will withstand strong vibration, and the vibration wave will be transmitted along the drill rod from the drill bit to the ground equipment, that is, the vibration will affect the entire drilling tool system. In general, vibration will affect the service life of the drilling tool, the construction efficiency of drilling, and the construction quality of drilling, and will also increase the safety risk and the probability of accidents. In the entire drilling tool system, the transmission and cumulative amplification effect of vibration along the drill rod system is the key factor that causes adverse effects of vibration. In the prior art, the drill rods are basically connected by thread cooperation, which is a rigid connection and does not have the effects of vibration isolation, filtering and damping consumption, but forms a transmission chain of vibration transmission. In order to reduce the influence and harm of vibration during drilling construction, a vibration damper is generally used to suppress vibration, which is usually arranged close to the drill bit. However, the effect of the vibration damper on the long-distance connecting and extending drill rod system is limited, and therefore, the actual effect of suppressing vibration is very limited and cannot fundamentally and effectively reduce the adverse effects of vibration. SUMMARY

[0005] In order to solve the above problems, the present application provides a drilling tool for directional long borehole, which is used to solve the problems mentioned in the background.

[0006] In order to achieve the above object, the present application adopts the following technical scheme to realize it: a drill tool for directional long drilling, comprising a drill rod and a coupling, and the coupling is in through butt joint with the drill rod in the axial direction; the coupling comprises: a butt joint shell, which is a split structure in two butt joint seals, and the two ends can be detachably fixedly connected with the drill rod.

[0007] and a damping structure, which is fixedly arranged in the butt joint shell; the damping structure comprises a passage cylinder, a plurality of petal blocks are distributed in the circumferential direction of the passage cylinder and are in plug-in cooperation with the passage cylinder and have freedom in the circumferential and radial directions, two disc springs are commonly connected between the plurality of petal blocks, the two disc springs are sleeved on the passage cylinder and are symmetrically distributed on the two sides of the plurality of petal blocks; flexible edge cover sleeves are clamped between the two disc springs and the plurality of petal blocks, the two edge cover sleeves are embeddedly sleeved on the passage cylinder, and the petal blocks and the edge cover sleeves are in close contact at the side walls; a plurality of supporting blocks are circumferentially distributed on the two disc springs, and one end of the disc spring away from the petal block is fixed on the plurality of supporting blocks; two groups of supporting blocks assembled with the two disc springs are correspondingly fixedly connected with inner end discs, and the two inner end discs are respectively fixed at the axial two ends inside the butt joint shell; an arc-shaped elastic plate is fixed on each petal block, and the elastic plate is movably plugged between two supporting blocks in opposite positions of the two groups.

[0008] Preferably, the two inner end discs are in sealing through butt joint with the two ends of the passage cylinder.

[0009] Preferably, the passage cylinder is provided with two stepped discs in the axial direction, and the passage cylinder forms an annular groove between the two stepped discs; the plurality of petal blocks are movably plugged in the annular groove; the two edge cover sleeves are correspondingly sleeved on the two stepped discs, and the stepped disc side walls are wrapped in the edge cover sleeves.

[0010] Preferably, two connecting blocks are detachably fixed on the petal block, and the two connecting blocks are oppositely distributed on the petal block at the two end sides in the axial direction of the passage cylinder; the disc spring, the edge cover sleeve and the petal block located on the same side are connected through the connecting block.

[0011] Preferably, a plurality of deformation zones same in number as the petal blocks are arranged on the disc spring, the deformation zones are in wrinkle protrusion shape, and the deformation zones extend on the disc spring generatrix; the plurality of deformation zones on the disc spring and the plurality of petal blocks are in alternate distribution.

[0012] Preferably, a plurality of embedding notches corresponding to the plurality of petal blocks are circumferentially distributed on the stepped disc; a plurality of embedding blocks corresponding to the embedding notches are arranged on the edge cover sleeve; the connecting block penetrates from the embedding block.

[0013] Preferably, the elastic plates are circumferentially distributed with multiple groups of elastic pieces, each group has two elastic pieces, and the two elastic pieces in each group are oppositely arranged in the axial direction of the passage cylinder; the side wall of the supporting block is circumferentially distributed with multiple arc holes corresponding to the multiple elastic pieces on the same side of the elastic plate, and the elastic pieces are fixed with passive pins inserted into the corresponding arc holes.

[0014] Preferably, the docking shell comprises a male shell, a female shell and a buffer sleeve, both the male shell and the female shell are threadedly connected with the drill rod; the male shell and the female shell are sealingly connected with each other through the buffer sleeve; two inner end plates are fixed on the inner end faces of the male shell and the female shell respectively.

[0015] Preferably, the inner end plate is provided with a docking cylinder at one end, a sealing sleeve is jointly arranged between the docking cylinder and one end of the passage cylinder, a press-fit ring is arranged in the sealing sleeve, and the press-fit ring is sealingly and press-fitted between the two ports of the docking cylinder and the passage cylinder.

[0016] Preferably, the buffer sleeve is fixed on the inner wall of the male shell, and the buffer sleeve is sleeved on the outer wall of the female shell through spline fitting.

[0017] The technical scheme has the following advantages or beneficial effects: the present application provides a drill for directional long drilling, mainly provides a coupling for docking between two drill rods of a drill rod system, replaces the rigid connection mode of thread fitting between drill rods in the prior art, the coupling is rigidly docked with the drill rod through a docking shell, and the docking shell is internally provided with a damping structure of an axially symmetrical structural layout design, which can elastically absorb energy and dampen complex vibrations composed of axial vibration, radial vibration and torsional vibration and other vibration forms generated during drilling, so as to achieve the effect of vibration isolation, filtration and damping weakening between drill rods, solve the problem of poor damping effect by additionally assembling damping auxiliary equipment in the prior art, effectively reduce the proportion of vibration transmission along the drill rod, maintain the drill equipment, ensure the construction efficiency and improve the drilling construction quality in complex geological environments, and especially effectively reduce the probability of safety risks and accidents. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application and its features, shapes and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. The same reference signs indicate the same parts throughout the drawings, and the drawings are not necessarily drawn to scale, but the emphasis is on showing the main idea of the present application.

[0019] Figure 1 is a perspective structural schematic view of a drill for directional long drilling provided by the present application.

[0020] Figure 2 is a perspective structural view of a drill rod.

[0021] Figure 3 is a perspective view of the coupling interface between two drill pipes.

[0022] Figure 4 is a perspective view of the coupling housing.

[0023] Figure 5 is a perspective view of the buffer sleeve.

[0024] Figure 6 is a perspective view of the damping structure without the elastic plate.

[0025] Figure 7 is a perspective view of the passage cylinder.

[0026] Figure 8 is a perspective view of the edge-covering sleeve.

[0027] Figure 9 is a perspective view of the petal-shaped block.

[0028] Figure 10 is a perspective view of the passage cylinder, the edge-covering sleeve, the petal-shaped block, and the disc spring.

[0029] Figure 11 is a perspective view of the passage cylinder, the edge-covering sleeve, and the inner end disc.

[0030] Figure 12 is a perspective view of the disc spring, the supporting block, and the inner end disc.

[0031] Figure 13 is a perspective view of the elastic plate.

[0032] Figure 14 is a perspective view of the supporting block.

[0033] In the figure: 1, coupling housing; 11, male head housing; 111, limiting groove; 12, female head housing; 121, spline groove; 13, buffer sleeve; 2, passage cylinder; 21, stepped disc; 211, embedded notch; 22, annular groove; 3, edge-covering sleeve; 31, embedded block; 32, through hole; 4, petal-shaped block; 41, embedded part; 42, arc plate part; 421, positioning groove; 43, connecting block; 431, crimping edge; 5, disc spring; 51, deformation zone; 52, fixing hole; 6, supporting block; 61, clamping support groove; 62, insertion block; 63, arc hole; 7, inner end disc; 71, positioning hole; 72, positioning cylinder; 73, coupling cylinder; 74, sealing sleeve; 741, crimping ring; 8, elastic plate; 81, elastic sheet; 82, passive pin; 9, drill pipe; 91, male joint; 92, female joint. DETAILED DESCRIPTION

[0034] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0035] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0036] As shown in Figure 1 , a drill tool for directional long drilling includes a drill pipe 9 and a coupling, and it is necessary to supplement that, in the prior art, the drill tool for directional long drilling is generally composed of a drill bit, a power device, a guide control tool, a drill pipe 9 system, a measuring and guiding tool, and an auxiliary tool, and the drill pipe 9 and the coupling can be regarded as belonging to the drill pipe 9 system, so the drill tool provided by the present application also includes the above other components in addition to the drill pipe 9 system.

[0037] As shown in Figure 1 and Figure 2 , the drill pipe 9 is a tubular structure with a hollow channel, the hollow channel of the drill pipe 9 is used to transport circulating media required in the drilling process, including drilling fluid, and can also be used as a through channel for a measuring device cable, so the coupling and the drill pipe 9 are in through butt joint in the axial direction. The drill pipe 9 is changed from rigid butt joint to non-rigid butt joint by the coupling. During drilling construction, the actual situation is mostly complex, and the drill tool will bear complex vibration, but when the vibration is transmitted along the drill pipe 9, it can be basically decomposed into the following three vibration types: axial vibration affecting the axial direction of the drill pipe 9, radial vibration affecting the radial direction of the drill pipe 9, and torsional vibration affecting the circumferential direction of the drill pipe 9.

[0038] As shown in Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the drill pipe 9 is of a conventional structure, and the two ends of the drill pipe 9 are respectively a male joint 91 with external threads and a female joint 92 with internal threads. In the prior art, the drill pipes 9 can be connected in a butt joint manner through the threaded connection of the male joint 91 and the female joint 92. The coupling includes a butt joint housing 1 in a two-segment butt joint sealing split structure. The butt joint housing 1 includes a male housing 11, a female housing 12, and a buffer sleeve 13. The male housing 11 can be threadedly connected with the female joint 92 of the drill pipe 9, and the female housing 12 can be threadedly connected with the male joint 91 of the drill pipe 9. That is, the coupling can be detachably fixed and connected between the two drill pipes 9 through the two ends of the butt joint housing 1. The connection of the coupling and the drill pipe 9 retains the butt joint manner of the threaded connection between the drill pipes 9. The male housing 11 and the female housing 12 are both in a cylindrical structure. An annular limiting groove 111 is annularly cut on the inner wall of the male housing 11. The buffer sleeve 13 is a cylindrical sleeve, and an annular stepped protrusion is arranged on the outer wall of the buffer sleeve 13 and embeddedly matched with the limiting groove 111. The buffer sleeve 13 is embeddedly and tightly arranged in the male housing 11. The female housing 12 is uniformly provided with spline grooves 121 on the outer wall. The male housing 11 is sealingly sleeved on the female housing 12 through the buffer sleeve 13, and the buffer sleeve 13 is spline-connected with the spline grooves 121.

[0039] It should be noted that, in the process of deep oil and gas drilling, the environment in which the drilling tools are located is usually extreme and harsh, and usually has to face high temperature, high pressure, high corrosion, etc. In addition, the drilling process needs to withstand severe vibration and friction. Therefore, in order to avoid the elastic force and sealing failure of the buffer sleeve 13, the material of the buffer sleeve 13 needs to meet the requirements of use in the above environmental conditions. According to the prior art, the material of the buffer sleeve 13 can be selected from perfluoroether rubber, modified polytetrafluoroethylene, or polyimide and its composite materials. In actual conditions, the materials with higher performance and cost can be selected.

[0040] Here, the butt joint shell 1 forms a stable and reliable rigid butt joint through the male head shell 11 and the female head shell 12 and the drill pipe 9. The buffer sleeve 13 is located between the fitting gap of the male head shell 11 and the female head shell 12 to form a sealing effect. In addition, the buffer sleeve 13 and the female head shell 12 are connected by spline connection, that is, the female head shell 12 and the male head shell 11 can move relatively in the axial direction, the buffer sleeve 13 is made of flexible and compressible material, that is, the female head shell 12 and the male head shell 11 have a certain moving space in the radial direction, the female head shell 12 can drive the buffer sleeve 13 to rotate in the limiting groove 111, that is, the female head shell 12 and the male head shell 11 can rotate relatively in the circumferential direction. In summary, the male head shell 11 and the female head shell 12 have the freedom to respond to axial vibration, radial vibration and torsional vibration through the buffer sleeve 13.

[0041] As shown in Figure 3 and Figure 7 , in order to effectively block and weaken the transmission of vibration between the drill pipes 9, a damping structure is assembled in the butt joint shell 1. The damping structure is fixed in the butt joint shell 1, Figure 3 The overall structure in the butt joint shell 1 is collectively referred to as a damping structure. The damping structure includes a passage cylinder 2, which is integrally machined and formed. The passage cylinder 2 has two stepped discs 21 distributed in the axial direction. The passage cylinder 2 forms an annular groove 22 between the two stepped discs 21. The annular groove 22 is located in the middle relative to the two ends of the axial direction of the passage cylinder 2. Four embedded notches 211 are evenly distributed on the stepped disc 21 in the circumferential direction. The embedded notches 211 on the two stepped discs 21 are arranged one by one in the axial direction.

[0042] As shown in Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 11 , the passage cylinder 2 is circumferentially distributed with four petal blocks 4. The petal block 4 includes an embedded part 41 and an arc plate part 42, which are both arc block structures and are concentrically arranged. The arc plate part 42 is arranged at equal distances from the two ends of the axial direction relative to the embedded part 41. The petal block 4 is inserted into the annular groove 22 through the embedded part 41, and the petal block 4 has freedom in the radial and circumferential directions of the passage cylinder 2. The two stepped discs 21 are each provided with a wrapped sleeve 3, which is made of the same material as the buffer sleeve 13. The wrapped sleeve 3 is provided with four embedded blocks 31, which are embedded in the four embedded notches 211 one by one. This achieves the relative positioning and installation of the wrapped sleeve 3 and the stepped disc 21, and the wrapped sleeve 3 wraps the stepped disc 21. Each embedded block 31 has a through hole 32 penetrating in the axial direction of the wrapped sleeve 3. The end face of the wrapped sleeve 3 is slightly convex relative to the disc face of the stepped disc 21 away from the annular groove 22.

[0043] As shown in Figure 10 and Figure 12As shown, two disc springs 5 are connected between the four petal blocks 4, the two disc springs 5 are sleeved on the passage cylinder 2 and symmetrically distributed on both sides of the four petal blocks 4; the edge covering sleeve 3 is clamped between the end surface of the embedded part 41 of the four petal blocks 4 and the disc spring 5 on the same side; the four through holes 32 of the disc spring 5 opposite to the edge covering sleeve 3 are each correspondingly provided with a fixing hole 52; in order to meet the requirement of elastic deformation generated by vibration, the disc spring 5 is provided with four deformation zones 51, the deformation zone 51 is in a wrinkle protrusion shape, and the deformation zone 51 extends on the generatrix of the disc spring 5; the four deformation zones 51 of the disc spring 5 are evenly and alternately distributed with the four petal blocks 4. It should be noted that the disc spring 5 is made of spring steel with corrosion prevention treatment on the surface, and the stiffness meets the requirements, and the material thickness takes into account the strength and elastic properties, and it should be emphasized that the spring steel used for the disc spring 5 is the existing material, and the material properties are public technical data, and the person skilled in the art can select the material with suitable performance based on the use scene requirements, and process and manufacture the material according to the corresponding requirements to meet the use requirements.

[0044] As shown in Figure 8 , Figure 9 , Figure 10 and Figure 11 , the petal block 4 is detachably fixed with two connecting blocks 43, the two connecting blocks 43 are symmetrically distributed on the end surfaces of the embedded part 41 at the axial position; the connecting block 43 passes through the fixing hole 52 on the same side of the disc spring 5 and the through hole 32 on the edge covering sleeve 3 in turn, and is locked on the embedded part 41 by a bolt, the connecting block 43 is provided with a crimping edge 431 in contact with the disc spring 5 and clamping the disc spring 5, the edge covering sleeve 3 and the embedded part 41 as a whole, through the locking of the connecting block 43, the arc plate part 42 is tightly attached to the side wall of the edge covering sleeve 3, and the four petal blocks 4 are evenly distributed in the circumferential direction of the passage cylinder 2. The assembly of the four petal blocks 4 and the two edge covering sleeves 3, although the edge covering sleeve 3 constitutes a position constraint for the petal block 4, but the edge covering sleeve 3 is flexible and elastic, so the petal block 4 still has a certain damping movement space in the radial and circumferential directions.

[0045] As shown in Figure 11 , Figure 12 and Figure 14As shown, four supporting blocks 6 are uniformly distributed in the circumferential direction on each of the two disc springs 5, and the supporting blocks 6 are in the form of arc-shaped blocks. An arc-shaped clamping groove 61 is formed in the inner arc sidewall of the supporting block 6 in a concentric manner, and the clamping groove 61 is centrally arranged in the axial direction of the supporting block 6. The end of the disc spring 5 away from the petal-shaped block 4 is inserted into the clamping groove 61 of the four supporting blocks 6 and is fixed and locked by a screw. The two groups of supporting blocks 6 assembled with the two disc springs 5 are both fixedly connected with an inner end plate 7. Four positioning holes 71 corresponding to the four supporting blocks 6 are arranged in the circumferential direction on one side of the inner end plate 7. An insertion block 62 is arranged on the supporting block 6 and inserted into the positioning hole 71. The supporting block 6 and the inner end plate 7 are fixed and locked by a screw. A positioning cylinder 72 and a butt cylinder 73 are respectively arranged at the center of the two side disc surfaces of the inner end plate 7. A sealing sleeve 74 is sleeved on the butt cylinder 73, and the material of the sealing sleeve 74 is the same as that of the buffer sleeve 13. A press-fit ring 741 is arranged on the inner wall of the sealing sleeve 74. During assembly, the four supporting blocks 6 are first fixed on the disc spring 5, and then the inner end plate 7 is fixed on the four supporting blocks 6. When the inner end plate 7 and the supporting block 6 are fixed and locked by a screw, the sealing sleeve 74 is also sleeved and sealed at the port position of the passage cylinder 2, and the press-fit ring 741 is press-fit between the port of the butt cylinder 73 and the port of the passage cylinder 2. The two inner end plates 7 and the two ends of the passage cylinder 2 are in sealed and through butt joint. An insertion groove matched with the positioning cylinder 72 is arranged at the inner end surface of both the male head shell 11 and the female head shell 12, and the positioning cylinder 72 and the insertion groove are in spline matching. The two inner end plates 7 are respectively inserted and assembled at the inner end surface of the male head shell 11 and the inner end surface of the female head shell 12 through the positioning cylinder 72. The end surface of the inner end plate 7 and the inner end surface of both the male head shell 11 and the female head shell 12 are kept in close contact, and are fixed and locked by a screw.

[0046] As shown in Figure 6 , Figure 9 , Figure 12 and Figure 13 , an arc-shaped elastic plate 8 is assembled on each petal-shaped block 4. A positioning groove 421 extending to both ends in the form of a circular arc is arranged in a concentric manner on the outer sidewall of the arc plate portion 42. The elastic plate 8 is inserted and matched in the positioning groove 421 and is fixed and locked on the petal-shaped block 4 by a screw. It should be noted that the material of the elastic plate 8 is the same as that of the disc spring 5, and the material manufacturing and processing meets the design requirements of the person skilled in the art. The two ends of the elastic plate 8 are movably inserted between the two supporting blocks 6 in the opposite positions. The elastic plate 8 is circumferentially and uniformly provided with three groups of elastic plates 81, each group having two elastic plates 81, and the two elastic plates 81 in each group are oppositely arranged in the axial direction of the passage cylinder 2. Three arc-shaped holes 63 corresponding to the three elastic plates 81 on the same side of the elastic plate 8 are circumferentially and uniformly arranged on the outer sidewall of the supporting block 6. A passive pin 82 is welded on the elastic plate 81 and inserted into the corresponding arc-shaped hole 63.

[0047] It should be noted that in order to cope with high frequency and high intensity vibration, the screws or bolts used in the coupling are all high strength bolts.

[0048] The coupling is rigidly connected with the drill pipe 9 through the male head shell 11 and the female head shell 12, and the male head shell 11 and the female head shell 12 are separately connected. In addition, the male head shell 11 and the female head shell 12 are both rigidly connected with an inner end plate 7, a set of supporting blocks 6 and a disc spring 5. In order to facilitate description, the connection of the above components to the male head shell 11 or the female head shell 12 is collectively referred to as a rigid connection body. Therefore, when the actual drilling operation is performed, the drill pipes 9 are vibration isolated, filtered and damped by the coupling. Specifically, the two drill pipes 9 are rigidly connected through the rigid connection body, but the vibration is isolated, filtered and damped between the two rigid connection bodies. Specifically, the actual composite vibration is divided into three vibration forms: axial vibration, radial vibration and torsional vibration. As for the axial vibration, when the rigid connection body vibrates and moves towards the end of the passage cylinder 2 in the axial direction, the compression deformation of the crimping ring 741, the disc spring 5 and the bending of the elastic sheet 81 occur. When the disc spring 5 is compressed, the compression deformation of the edge cover 3 is further caused. When the rigid connection body vibrates away from the end of the passage cylinder 2, the above deformation is restored. In the process of reciprocating axial vibration, the axial vibration can be elastically absorbed and damped to achieve the effect of vibration reduction.

[0049] As for the radial vibration, when the rigid connection body is displaced in the radial direction, the radial deformation of the sealing sleeve 74, the disc spring 5, the elastic sheet 81 and the edge cover 3 is caused. The radial sliding of the petal-shaped block 4 in the annular groove 22 is caused, so that the effect of elastic energy absorption and vibration reduction in the radial direction is achieved.

[0050] As for the torsional vibration, when the rigid connection body is angularly displaced in the circumferential direction, the torsional deformation of the disc spring 5 is caused by the fixed connection between the supporting block 6 and the disc spring 5. The deformation of the edge cover 3 is caused, the angular displacement of the connecting block 43 around the passage cylinder 2 is caused, and the circumferential sliding of the petal-shaped block 4 in the annular groove 22 is caused. In addition, the passive pin 82 is kept in active insertion between the elastic sheet 81 and the arc hole 63 of the supporting block 6, so that the elastic sheet 8 is mainly torsionally deformed by the elastic sheet 81. Thus, the effect of elastic energy absorption and vibration reduction in the circumferential direction is achieved.

[0051] It should be noted that the actual vibration is complex, and the damping structure also has a complex deformation effect when bearing the vibration, and it should be emphasized that the above deformation is within the elastic deformation recoverable range of the elastic member. In the damping structure, the disc spring 5 is fixedly connected between the rigid connecting body and the petal-shaped block 4, the four elastic plates 8 are fixed on the petal-shaped block 4 and are inserted on the supporting block 6 of the rigid connecting body, the cooperation of the elastic plates 8 and the disc spring 5 strengthens the axial connection between the damping structure and the butt joint shell 1, and then ensures the connection strength between the coupling and the drill pipe 9 as a whole; the damping material structure composed of the non-metallic elastic material composed of the edge covering sleeve 3 and the sealing sleeve 74 and the metallic elastic material composed of the disc spring 5 and the elastic sheet 81 is adopted in the damping structure, the damping performance and the stiffness are considered, the vibration energy absorption and the structural strength stability can be balanced, the damping requirement in a harsh environment is more suitable, and the overall service life of the damping structure is prolonged. In addition, the damping material in the coupling can be regularly disassembled and replaced after long-term use, so as to avoid performance failure in the actual working process.

[0052] As for the overall structural layout of the damping structure, it is designed as an axial symmetric structure, so that when bearing the actual vibration, the vibration load and stress can be uniformly and symmetrically distributed, the local stress concentration is avoided, and the scene of multiple composite stresses of axial force, radial force and torsional force is more suitable, so as to ensure the reliability and stability of the coupling in actual use.

[0053] The present application provides a drill tool for directional long drilling, mainly provides a coupling for butt joint between two drill pipes 9 of a drill tool drill pipe 9 system, which replaces the rigid connection mode of thread cooperation between drill pipes 9 in the prior art. The coupling is rigidly butt jointed with the drill pipe 9 through the butt joint shell 1, and the butt joint shell 1 is assembled with the damping structure of axial symmetric structure layout design, which can elastically absorb energy and damp the complex vibration composed of axial vibration, radial vibration and torsional vibration and other vibration forms generated in the drilling process, so as to achieve the effect of vibration isolation, filtering and damping weakening between the drill pipes 9, solve the problem of poor damping effect by additionally assembling damping auxiliary equipment in the prior art, effectively reduce the proportion of vibration transmission along the drill pipe 9, maintain the drilling tool equipment, ensure the construction efficiency and improve the drilling construction quality in complex geological environment, and especially effectively reduce the safety risk and accident probability.

[0054] In the description of the application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0055] In the description of the application, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "arrangement", "connection", "installation", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood through specific circumstances.

[0056] The preferred embodiments of the application are described above. It needs to be understood that the application is not limited to the above specific embodiments, and the devices and structures not described in detail should be understood as being implemented in the ordinary way in the art; any person skilled in the art can make many possible changes and modifications, or modify equivalent embodiments without departing from the technical solution of the application, which does not affect the essential content of the application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the application, without departing from the technical solution of the application, still belongs to the protection scope of the technical solution of the application.

Claims

1. A drill tool for directional long hole drilling, characterized by, The application relates to a drill rod and a coupling, and the coupling is in axial through joint with the drill rod. The coupling comprises: a joint shell in a split structure of two joint sealing sections, and two ends of the joint shell are detachably fixedly connected with the drill rod; 2. A directional long hole drilling assembly according to claim 1, characterized in that: and a damping structure fixedly arranged in the joint shell, wherein the damping structure comprises a passage cylinder, a plurality of petal blocks are distributed in the circumferential direction of the passage cylinder and have freedom degrees in the circumferential and radial directions, two disc springs are connected between the plurality of petal blocks, the two disc springs are sleeved on the passage cylinder and are symmetrically distributed on the two sides of the plurality of petal blocks, flexible edge covering sleeves are arranged between the two disc springs and the plurality of petal blocks, the two edge covering sleeves are embeddedly sleeved on the passage cylinder, the petal blocks are in close contact with the edge covering sleeves at the side walls, a plurality of supporting blocks are circumferentially distributed on the two disc springs, one end of the disc spring away from the petal blocks is fixed on the plurality of supporting blocks, two groups of supporting blocks assembled with the two disc springs are fixedly connected with inner end plates, the two inner end plates are respectively fixed at the axial two ends inside the joint shell, and an arc-shaped elastic plate is fixed on each petal block and movably inserted between two supporting blocks in opposite positions of the two groups.

3. The directional long hole drilling assembly of claim 1, wherein: The two inner end plates are in sealing through joint with the two ends of the passage cylinder.

4. A directional long hole drilling assembly according to claim 3, characterized in that: The passage cylinder is provided with two step plates in the axial direction, and the passage cylinder forms an annular groove between the two step plates; the plurality of petal blocks are movably inserted in the annular groove; and the two edge covering sleeves are correspondingly sleeved on the two step plates, and the side walls of the step plates are wrapped in the edge covering sleeves.

5. The directional long hole drilling assembly of claim 1, wherein: The petal blocks are detachably fixed with two connecting blocks, the two connecting blocks are oppositely distributed on the petal blocks at the two axial ends of the passage cylinder; the disc springs, the edge covering sleeves and the petal blocks on the same side are connected through the connecting blocks.

6. A directional long hole drilling assembly according to claim 4, characterized in that: The disc spring is provided with a plurality of deformation zones same in number with the petal blocks, the deformation zones are in a wrinkle convex shape, and the deformation zones extend on the disc spring generatrix; the plurality of deformation zones on the disc spring and the plurality of petal blocks are alternately distributed.

7. The directional long hole drilling assembly of claim 1, wherein: The step plate is circumferentially provided with a plurality of embedding notches corresponding to the plurality of petal blocks; the edge covering sleeve is provided with a plurality of embedding blocks embedded in the plurality of embedding notches; and the connecting block penetrates from the embedding block.

8. The directional long hole drilling assembly of claim 1, wherein: The elastic plate is circumferentially provided with a plurality of groups of elastic sheets, each group has two elastic sheets, and the two elastic sheets in each group are oppositely arranged in the axial direction of the passage cylinder; the side wall of the supporting block is circumferentially provided with a plurality of arc holes corresponding to the plurality of elastic sheets on the same side of the elastic plate, and the elastic sheet is fixed with a passive pin inserted in the corresponding arc hole.

9. The directional long hole drilling assembly of claim 2, wherein: The joint shell comprises a male shell, a female shell and a buffer sleeve, the male shell and the female shell are in threaded connection with the drill rod; the male shell and the female shell are sealingly connected with each other through the buffer sleeve; and the two inner end plates are respectively fixed on the inner end faces of the male shell and the female shell.

10. The directional long hole drilling assembly of claim 8, wherein: One end of the inner end plate is provided with a joint cylinder, a sealing sleeve is sleeved between the joint cylinder and one end of the passage cylinder, a compression ring is arranged in the sealing sleeve, and the compression ring is sealingly compressed between the two ports of the joint cylinder and the passage cylinder. The buffer sleeve is fixed on the inner wall of the male shell, and the buffer sleeve is sleeved on the outer wall of the female shell through spline connection.

Images