Guide butt joint drilling tool
By designing a guide docking drill bit, utilizing the matching connection of irregularly shaped key and slot, and high-pressure mud cleaning, the problem of the auxiliary drill bit being difficult to remove soil in long-distance drilling was solved, and stable construction in soft strata was achieved.
Patent Information
- Application Number
- CN202520338253.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-02-28
AI Technical Summary
In long-distance horizontal directional drilling, especially in soft strata and sandy layers, the drill bit of the auxiliary drilling rig has difficulty exiting the soil smoothly along the guide hole of the main drilling rig, resulting in hole slippage and failure to complete the construction.
Design a guide docking drill bit, including a main drill bit and an auxiliary drill bit. The main drill bit is equipped with a special-shaped key and a guide sleeve, and the auxiliary drill bit is equipped with a slot. The main drill bit and the auxiliary drill bit are integrated by matching the special-shaped key and the slot. The auxiliary drilling rig cleans impurities with high-pressure mud to ensure stable connection.
It achieves a stable connection between the main drill bit and the auxiliary drill bit, avoids hole slippage, and ensures the accuracy and success rate of pilot hole construction, making it suitable for construction in soft strata.
Smart Images
Figure CN223707534U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the field of horizontal directional drilling construction, and particularly relates to a guide butt joint drilling tool. BACKGROUND
[0002] Horizontal directional drilling construction is a kind of construction machinery and construction method for laying various underground public facilities (such as pipelines, cables, etc.) without excavating the ground surface. Various specifications of horizontal directional drilling machines are composed of a drilling machine system, a control system, a mud system, a drilling tool and auxiliary machines. The horizontal directional drilling construction process includes measurement and layout, drilling field arrangement, drilling machine installation and testing, drilling guide holes, hole expansion, pipeline back dragging, and site cleaning. In the directional drilling crossing construction of a medium or short distance, a one-way directional control technology is generally used for guide hole construction. However, in the directional drilling crossing construction of a long distance, as the drilling length increases, the frictional resistance of the drill string to the stratum significantly increases, and the torsional deformation of the drill string increases, which results in that the torque of the drilling machine cannot be timely transmitted to the drill bit, and the drill bit is in a discontinuous rotating state at the bottom of the well. In this case, it is difficult for the driller to control the orientation of the tool face angle underground, so that there is a certain deviation between the tool face angle displayed on the ground and the actual tool face angle underground, thereby causing the drilling direction to be out of control, and it is difficult for the actual outcrop point to completely match the designed outcrop point.
[0003] In order to solve the problem of directional control difficulty in long-distance horizontal directional drilling, a guide hole butt joint technology suitable for long-distance crossing is generated. A drilling machine is arranged at each of the entry point and the outcrop point of the crossing curve. The drilling machine on the entry side is usually a main drilling machine with a drilling distance of more than half of the crossing length or even longer. The drilling machine on the outcrop side is usually an auxiliary drilling machine, and the two drilling machines simultaneously perform guide hole construction according to the designed crossing curve. When the drill bits of the two drilling machines reach the preset butt joint range, the drill bit on one side is pushed forward, and the drill bit on the other side is pulled back.
[0004] The strata crossed by horizontal directional drilling are various, such as rock strata, soft strata, sand layers, and gravel layers. In the rock strata crossing, after the main drilling machine and the auxiliary drilling machine complete the crossing construction, the drill bit of the auxiliary drilling machine is drilled into the drill bit hole of the main drilling machine, the main drilling machine uniformly pulls back the drill rod, the control system controls the drill bit of the auxiliary drilling machine to uniformly drill along the direction of the guide hole of the main drilling machine, and the crossing curves of the two drilling machines are completely combined, so that the guide hole construction is accurately completed. The hole bearing capacity of the rock strata is strong, and the hole is well formed, so that the drill bit of the auxiliary drilling machine can smoothly follow the drill bit of the main drilling machine. However, in the soft strata and sand layer crossing, the hole bearing capacity of the soft strata and sand layer is low, and the hole is easily deformed, which makes it difficult for the drill bit of the auxiliary drilling machine to follow the drill bit of the main drilling machine, and the drill bit of the auxiliary drilling machine cannot smoothly emerge from the guide hole drilled by the drill bit of the main drilling machine, resulting in hole deviation and failure to complete the construction. CONTENT OF THE UTILITY MODEL
[0005] The utility model provides a kind of guided butt joint drilling rig, it is applicable to soft formation, sand layer butt joint crossing, main drill bit and auxiliary drill bit connection form an integral whole, avoid hole.
[0006] The utility model discloses the technical scheme as follows:
[0007] A kind of guided butt joint drilling rig, it includes the main drill bit of being arranged in the one side of main drilling machine and the auxiliary drill bit of being arranged in the one side of auxiliary drilling machine and being butt joint with main drill bit, main drill bit includes drill bit main body, the cylinder cover of being wrapped drill bit main body, the multiple special-shaped keys of being arranged in the outer wall of cylinder cover, auxiliary drill bit includes the pilot cylinder for guiding main drill bit, the introduction cylinder for being connected with the one end of pilot cylinder and being used for preliminary introduction main drill bit, the butt joint cylinder being connected with the other end of pilot cylinder, the inside of butt joint cylinder is equipped with multiple card slots for special-shaped key enters and locks special-shaped key.
[0008] Further, the butt joint cylinder includes a first connecting portion and a butt joint portion integrally formed with the first connecting portion. The first connecting portion is a truncated cone-shaped body with one end larger and the other end smaller. The outer surface of the first connecting portion is provided with a first thread for connecting with a drill rod. The center of the first connecting portion is provided with an axial first mud hole. The diameter of the first mud hole can be, for example, 40-60 mm. The butt joint portion is a circular cylinder body with a certain wall thickness. The wall thickness of the butt joint portion can be, for example, 20-40 mm, and is preferably 25-35 mm. The outer diameter of the butt joint portion is not less than the outer diameter of the pilot cylinder. Preferably, the outer diameter of the butt joint portion is consistent with the outer diameter of the pilot cylinder. The inner diameter of the butt joint portion is less than the inner diameter of the pilot cylinder, for example, 15-20 mm less.
[0009] Further, the card slots are at least two, and the plurality of card slots are circumferentially arrayed around the axis of the butt joint portion. The number can be, for example, 2 or 3. The card slots are provided on the inner wall of the butt joint portion. A single card slot is L-shaped. The card slot includes an axial long slot, an arc-shaped slot in communication with the end of the axial long slot and extending along the circumference of the butt joint portion, and a fixing slot in communication with the arc-shaped slot. The axial long slot and the fixing slot are disposed on the same side of the arc-shaped slot. The axial long slot is provided with an opening for the special-shaped key to enter. The shape of the opening is the same as the transverse cross-sectional shape of the special-shaped key (the transverse direction is the radial direction of the cylinder cover). The length of the fixing slot is less than the length of the axial long slot and slightly larger than the size of the special-shaped key in the axial direction. The fixing slot is adapted to the special-shaped key. The length of the axial long slot is less than the length of the butt joint portion, for example, 8-15 mm less. The special-shaped key of the main drill bit enters the axial long slot through the opening and moves to the end of the axial long slot. The main drill bit is rotated, the special-shaped key enters the arc-shaped slot, and after rotating to the limit position along the arc-shaped slot, the main drill bit is pulled back, the special-shaped key enters the fixing slot, and the special-shaped key is locked in the fixing slot. The main drill bit and the auxiliary drill bit are connected as an integral whole.
[0010] Further, the inner cavity of the connecting part is provided with a spacer between the first mud hole, a plurality of first cleaning nozzles are arranged on the side wall of the first connecting part and penetrate into the inner cavity of the connecting part, the first cleaning nozzles are inclined towards the clamping grooves, one group of first cleaning nozzles corresponds to one clamping groove, at least three first cleaning nozzles are arranged in each group, the first cleaning nozzles in the same group are arranged to be different in direction and respectively face the axial long grooves, the arc grooves and the fixing grooves, the high-pressure mud transported from the auxiliary drilling machine to the first mud hole is sprayed to the connecting part through the first cleaning nozzles, and the sand, gravel and other impurities in the axial long grooves, the arc grooves and the fixing grooves are washed to avoid the accumulation of impurities in the clamping grooves and affect the normal movement of the special-shaped clamping keys in the clamping grooves.
[0011] Further, the pilot cylinder is a circular straight cylinder, the wall thickness of the pilot cylinder is consistent with the wall thickness of the lead-in cylinder, and the material of the pilot cylinder can be high-speed steel, for example. The pilot cylinder limits the main drill bit entering its interior and prepares for the special-shaped clamping keys to enter the clamping grooves.
[0012] Further, the lead-in cylinder is a circular truncated cone, the small-diameter end port of the lead-in cylinder is connected with the pilot cylinder, and preferably, the inner diameter of the small-diameter end is consistent with the inner diameter of the pilot cylinder. The connection between the lead-in cylinder and the pilot cylinder is chamfered, and the chamfer radius can be 4-8 mm, preferably about 6 mm, for example. When the main drill bit enters the pilot cylinder, the damage to the end of the main drill bit is avoided, and the smoothness of the main drill bit entering the pilot cylinder is improved. A plurality of cylindrical first wear-resistant teeth are arranged in an annular array on the outer surface of the large-diameter end of the lead-in cylinder close to the port. The first wear-resistant teeth are used to protect the outer wall of the lead-in cylinder, prevent the wall from being worn and thinned, and the material of the first wear-resistant teeth can be wear-resistant alloy steel, for example. The diameter of the large-diameter end of the lead-in cylinder is 1.5-2 times the diameter of the small-diameter end, the height of the lead-in cylinder can be 200-600 mm, preferably 300-400 mm, for example, and the wall thickness of the lead-in cylinder can be 5-10 mm, preferably 6-8 mm, for example. The material of the lead-in cylinder can be high-speed steel, for example. During the docking process, the main drill bit first enters the large-diameter end port of the lead-in cylinder, is guided by the lead-in cylinder, is gradually aligned and smoothly enters the pilot cylinder.
[0013] Further, the drill bit body includes a plurality of paddles, a cantilever shaft fixed on the paddles, a roller rotatably connected to the cantilever shaft, cutting teeth distributed on the roller, and a second cleaning nozzle arranged between the paddles. The roots of the plurality of paddles are connected to form a transition part and are connected with a second connecting part. The second connecting part is a truncated cone with one end large and the other end small. The outer surface of the second connecting part is provided with a second thread for connecting with a mud motor at the front end of the drill pipe. An axial second mud hole is formed in the center of the second connecting part. The diameter of the second mud hole can be 40-60 mm, for example. The second cleaning nozzle penetrates through the transition part and communicates with the second mud hole, and is used to spray high-pressure mud transported from the main drilling machine to the second mud hole. The high-pressure mud impacts the sand and stone impurities to assist the main drill bit in advancing. The tooth shape of the cutting teeth can be wedge-shaped teeth or conical ball teeth, for example.
[0014] Further, the cylinder cover is open at one end for the roller to extend out, and the other end is closed and connected to the transition part of the drill bit body through the annular plate, the roller extends out of the cylinder cover by, for example, 5-10 mm, and a plurality of cylindrical second wear-resistant teeth extending radially from the cylinder cover are arranged in an annular array on the outer wall of the cylinder cover close to the port, the second wear-resistant teeth are used to protect the outer wall of the cylinder cover, prevent the outer wall of the cylinder cover from being worn and thinned, the material of the second wear-resistant teeth may be, for example, wear-resistant alloy steel, the height h of the second wear-resistant teeth protruding from the outer wall of the cylinder cover is set to be less than the difference between the inner wall radius of the butt joint part and the outer wall radius of the cylinder cover, so that the second wear-resistant teeth do not affect the main drill bit entering the butt joint part, and h may be, for example, 2-3 mm.
[0015] Further, the distribution position and number of the special-shaped keys correspond to the distribution position and number of the key grooves respectively, the special-shaped keys are arc-shaped protrusions, the special-shaped keys have an outer arc surface parallel to the outer wall of the cylinder cover, a vertical surface and an inclined surface arranged between the outer arc surface and the outer wall of the cylinder cover, the longitudinal section of the special-shaped key is a right-angled trapezoid (the longitudinal direction is the central axis direction of the cylinder cover), the inclined surface is formed on the side of the special-shaped key facing the port of the cylinder cover, the inner edge of the inclined surface coincides with the outer edge of the port of the cylinder cover, the inclination angle of the inclined surface may be, for example, 30-60 degrees, the inclined surface of the special-shaped key plays a guiding role when the main drill bit enters the guide-in cylinder and the pilot cylinder, so that the main drill bit smoothly enters the guide-in cylinder and the pilot cylinder, the diameter of the curved surface where the outer arc surface is located is slightly smaller than the inner diameter of the pilot cylinder, for example, 1-2 mm smaller.
[0016] The butt joint process of the guiding butt joint drilling tool is as follows:
[0017] The main drill bit of this invention is connected to one side of the main drilling rig, while a conventional drill bit (the hole-forming diameter of the conventional drill bit is larger than the large-diameter end diameter of the inlet tube) is connected to the other side of the auxiliary drilling rig. After the main drill bit and conventional drill bit are respectively guided into the docking area by their respective directional control systems, the conventional drill bit is pulled out along the guide hole on the auxiliary drilling rig side, disassembled, and replaced with the auxiliary drill bit of this invention, which is then advanced to the original docking area. During the docking process, the auxiliary drill bit does not rotate or advance, while the main drill bit continues to rotate and advance. During the advancement of the main drill bit, it first enters the inlet tube. Guided by the inlet tube, the main drill bit smoothly enters the guide tube, which limits the main drill bit's rotation speed, allowing it to continue advancing. As the main drill bit is pushed into the docking section, the pressure and position signals fed back by the main drill bit control the shaped locking key to sequentially enter the axial long groove, the arc groove, and the fixed groove. Specifically, when the shaped locking key rotates to the opening of the axial long groove, it enters the axial long groove, the main drill bit stops rotating, and the main drill bit continues to advance. The shaped locking key moves to the end of the axial long groove, and the main drill bit rotates to make the shaped locking key enter the arc groove. After rotating along the arc groove to the limit position, the main drill bit is pulled back, and the shaped locking key enters the fixed groove, locking the shaped locking key in the fixed groove. The main drill bit and the auxiliary drill bit are connected as one unit. The auxiliary drill bit is pulled back, and the auxiliary drilling machine drags the main drill bit and the auxiliary drill bit, which are now connected as one unit, out of the soil, thus achieving the guiding work.
[0018] The beneficial effects of this utility model are:
[0019] This utility model provides a guide docking drill bit. A frustum-shaped inlet tube precisely captures the main drill bit, guiding it gradually and smoothly into the guide tube. The guide tube also guides and limits the main drill bit as it enters, preparing for the insertion of a shaped locking key into the slot. Through axial grooves, arc grooves, and a fixing groove within the docking tube, and the shaped locking key on the main drill bit, the main drill bit advances, and the shaped locking key sequentially passes through the axial groove and arc groove, finally entering the fixing groove, locking the shaped locking key within it. This achieves an integrated connection between the main and auxiliary drill bits, preventing borehole slippage and ensuring smooth exit of the auxiliary drill bit. The inclined surface of the shaped locking key reduces jamming and misalignment when the main drill bit enters the inlet and guide tubes, ensuring smooth entry. This guide docking drill bit, with its integrated connection of the main and auxiliary drill bits, is suitable for pilot hole construction in soft soil formations. Attached Figure Description
[0020] Figure 1 This is an overall schematic diagram of a guide docking drill bit of this utility model.
[0021] Figure 2 Side view of the auxiliary drill bit.
[0022] Figure 3 for Figure 2A sectional stereoscopic view along the AA direction.
[0023] Figure 4 for Figure 2 A sectional perspective view along the BB direction in the image.
[0024] Figure 5 A schematic diagram of the main drill bit.
[0025] Figure 6 This is a schematic diagram of a roller.
[0026] Figure 7 A 3D view of a master drill bit without roller cones.
[0027] Figure 8 This is the front view of the master drill bit without roller cones.
[0028] Figure 9 for Figure 8 A three-dimensional sectional view along the CC direction.
[0029] Figure 10 This is a schematic diagram of an irregularly shaped key entering an axial long slot.
[0030] Figure 11 This is a schematic diagram of an irregularly shaped key entering a fixing slot.
[0031] Explanation of reference numerals in the attached figures:
[0032] 1-Main drill bit, 101-Drill bit body, 1011-Tooth, 1012-Cantilever shaft, 1013-Roller cone, 1014-Cutting tooth, 1015-Second cleaning nozzle, 1016-Transition section, 1017-Second connecting section, 1018-Second thread, 1019-Second mud hole, 102-Cylinder cover, 103-Irregular key, 1031-Outer arc surface, 1032-Vertical surface, 1033-Chamfered surface, 2-Auxiliary drill bit, 201-Guide cylinder, 202-Introduction cylinder
[0033] 203-Dating cylinder, 2031-First connecting part, 2032-Dating part, 2033-First thread, 2034-First mud hole, 3-Slot, 301-Axial long groove, 302-Arc groove, 303-Fixing groove, 304-Opening, 4-Gap part, 5-First cleaning nozzle, 6-Annular plate, 7-First wear-resistant tooth, 8-Second wear-resistant tooth. Detailed Implementation
[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0035] like Figures 1-11As shown, the utility model provides a kind of guiding butt joint drilling rig, it includes the main drill bit 1 of being arranged in the one side of main drilling machine and the auxiliary drill bit 2 being arranged in the one side of auxiliary drilling machine and being butt joint with main drill bit 1, main drill bit 1 includes drill bit main body 101, the barrel cover 102 of being wrapped drill bit main body 101, the multiple special-shaped clamping keys 103 being arranged in the outer wall of barrel cover 102, auxiliary drill bit 2 includes the pilot barrel 201 for guiding main drill bit 1, the introduction barrel 202 being connected with one end of pilot barrel 201 and being used to preliminary guide main drill bit 1, the butt joint barrel 203 being connected with the other end of pilot barrel 201, the inside of butt joint barrel 203 is equipped with multiple card slots 3 for special-shaped clamping key 103 to enter and lock special-shaped clamping key 103.
[0036] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 As shown, butt joint barrel 203 includes first connecting portion 2031 and the butt joint portion 2032 being integrally formed with first connecting portion 2031, first connecting portion 2031 is the truncated cone body of one end big and the other end small, the outer surface of first connecting portion 2031 is equipped with first thread 2033 for being connected with drill pipe, the center of first connecting portion 2031 is opened with the first mud hole 2034 of axial direction, the diameter of first mud hole 2034 can be 40-60mm, for example, butt joint portion 2032 is the circular cylinder with certain wall thickness, the wall thickness of butt joint portion 2032 can be 20-40mm, preferably 25-35mm, the outer diameter of butt joint portion 2032 is not less than the outer diameter of pilot barrel 201, preferably, the outer diameter of butt joint portion 2032 is consistent with the outer diameter of pilot barrel 201, the inner diameter of butt joint portion 2032 is less than the inner diameter of pilot barrel 201, for example, 15-20mm.
[0037] As Figure 2 、 Figure 3 、 Figure 4 、 Figure 10 、 Figure 11As shown, the card slot 3 is at least two, a plurality of card slots 3 are arranged around the circumferential of the shaft of the docking portion 2032, the number may be 2 or 3, for example, the card slot 3 is opened in the inner wall of the docking portion 2032, a single card slot 3 is L-shaped, the card slot 3 includes an axial long slot 301, an arc-shaped slot 302 communicated with the end of the axial long slot 301 and extending along the circumference of the docking portion 2032, and a fixed slot 303 communicated with the arc-shaped slot 302, the fixed slot 303 is folded back, opposite to the extending direction of the axial long slot, the axial long slot 301 and the fixed slot 303 are arranged on the same side of the arc-shaped slot 302, the axial long slot 301 is provided with an opening 304 for the entry of the special-shaped key 103, the shape of the opening 304 is the same as the transverse cross-sectional shape of the special-shaped key 103 (the transverse direction is the radial direction of the barrel 102), the length of the fixed slot 303 is smaller than the length of the axial long slot 301, slightly larger than the length of the special-shaped key 103 in the axial direction, the fixed slot 303 is adapted to accommodate the special-shaped key 103, the length of the axial long slot 301 is smaller than the length of the docking portion 2032, for example, 8-15mm smaller, the special-shaped key 103 of the main drill bit 1 enters the axial long slot 301 through the opening 304 and moves to the end of the axial long slot 301, the main drill bit 1 is rotated, the special-shaped key 103 enters the arc-shaped slot 302 and rotates to the limit position along the arc-shaped slot 302, then the main drill bit 1 is pulled back, the special-shaped key 103 enters the fixed slot 303 and is locked in the fixed slot 303, the main drill bit 1 and the auxiliary drill bit 2 are connected as a whole.
[0038] As shown in Figure 3 , Figure 4 , the inner cavity of the docking portion 2032 is provided with a spacing portion 4 between the first mud hole 2034, a plurality of first cleaning nozzles 5 are opened on the side wall of the first connecting portion 2031 and penetrate into the inner cavity of the docking portion 2032, the first cleaning nozzles 5 are inclined towards the card slot 3, a group of first cleaning nozzles 5 corresponds to a card slot 3, at least three first cleaning nozzles 5 are arranged in each group, the first cleaning nozzles 5 in the same group are arranged in different directions and respectively face the axial long slot 301, the arc-shaped slot 302 and the fixed slot 303, the high-pressure mud conveyed from the auxiliary drilling machine side to the first mud hole 2034 is sprayed to the docking portion 2032 through the first cleaning nozzles 5, and the sand, gravel and other impurities in the axial long slot 301, the arc-shaped slot 302 and the fixed slot 303 are washed to avoid the accumulation of impurities in the card slot 3 and affect the normal movement of the special-shaped key 103 in the card slot 3.
[0039] As shown in Figure 1 , Figure 3 , Figure 4 , the guide cylinder 201 is a circular straight cylinder, the wall thickness of the guide cylinder 201 is consistent with the wall thickness of the lead-in cylinder 202, the material of the guide cylinder 201 may be high-speed steel, for example, the guide cylinder 201 limits the main drill bit 1 entering its inside and makes preliminary preparation for the special-shaped key 103 entering the card slot 3.
[0040] As Figure 1 , Figure 2 , Figure 3 , Figure 4 shown, the introduction cylinder 202 is a circular truncated cone cylinder (or truncated cone cylinder), the small end port of the introduction cylinder 202 is connected with the pilot cylinder 201, preferably, the inner diameter of the small end is consistent with the inner diameter of the pilot cylinder 201, the connection between the introduction cylinder 202 and the pilot cylinder 201 is chamfered, the chamfer radius may be, for example, 4-8mm, preferably about 6mm, to avoid damage to the end of the main drill bit 1 when the main drill bit 1 enters the pilot cylinder 201, while improving the smoothness of the main drill bit 1 entering the pilot cylinder 201, a plurality of cylindrical first wear-resistant teeth 7 are arranged in an annular array on the outer surface of the large end of the introduction cylinder 202 close to the port, the first wear-resistant teeth 7 are used to protect the outer wall of the introduction cylinder 202, prevent the cylinder wall from being worn and thinned, the material of the first wear-resistant teeth may be, for example, wear-resistant alloy steel, the diameter of the large end of the introduction cylinder 202 is 1.5-2 times the diameter of the small end, the height of the introduction cylinder 202 may be, for example, 200-600mm, preferably 300-400mm, the thickness of the cylinder wall of the introduction cylinder 202 may be, for example, 5-10mm, preferably 6-8mm, and the material may be, for example, high-speed steel, during the butt joint process, the main drill bit 1 first enters the large end port of the introduction cylinder 202, is guided by the introduction cylinder 202, gradually straightens out and smoothly enters the pilot cylinder 201.
[0041] As Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 shown, the drill bit body 101 includes a plurality of pads 1011 fixed in the drill bit body, a cantilever shaft 1012 fixed on the pads 1011, a roller 1013 rotatably connected to the cantilever shaft 1012, cutting teeth 1014 distributed on the roller 1013, and a second cleaning nozzle 1015 arranged between the pads 1011, the roots of the plurality of pads 1011 are connected to form a transition portion 1016 and are connected to a second connecting portion 1017, the second connecting portion 1017 is a truncated cone body with one end large and the other end small, the outer surface of the second connecting portion 1017 is provided with a second thread 1018 for connecting with a mud motor at the front end of the drill pipe, the center of the second connecting portion 1017 is provided with an axial second mud hole 1019, the diameter of the second mud hole 1019 may be, for example, 40-60mm, the second cleaning nozzle 1015 penetrates through the transition portion 1016 and communicates with the second mud hole 1019, for spraying high-pressure mud delivered from the main drilling machine to the second mud hole 1019, the high-pressure mud impacts the sand and stone impurities, assisting the main drill bit 1 to advance, the tooth shape of the cutting teeth 1014 may be, for example, wedge-shaped teeth or conical ball teeth.
[0042] As Figure 1 ,Figure 5 、 Figure 7 、 Figure 8 、 Figure 9 As shown in FIG. 1, the other end of the barrel cover 102 is closed and connected to the transition part 1016 of the drill bit main body 101 through the annular plate 6, the roller cone 1013 extends out of the barrel cover 102, for example, 5-10 mm, a plurality of cylindrical second wear-resistant teeth 8 radially extending out of the barrel cover 102 are arranged in an annular array on the outer wall of the barrel cover 102 close to the port, the second wear-resistant teeth 8 are used to protect the outer wall of the barrel cover 102, prevent the outer wall of the barrel cover from being worn and thinned, the material of the second wear-resistant teeth 8 can be, for example, wear-resistant alloy steel, the height h of the second wear-resistant teeth 8 protruding out of the outer wall of the barrel cover is set to be less than the difference between the inner wall radius of the butt joint part 2032 and the outer wall radius of the barrel cover 102, so that the second wear-resistant teeth 8 do not affect the main drill bit 1 entering the butt joint part 2032, h can be, for example, 2-3 mm.
[0043] As shown in FIG. 1, the other end of the barrel cover 102 is closed and connected to the transition part 1016 of the drill bit main body 101 through the annular plate 6, the roller cone 1013 extends out of the barrel cover 102, for example, 5-10 mm, a plurality of cylindrical second wear-resistant teeth 8 radially extending out of the barrel cover 102 are arranged in an annular array on the outer wall of the barrel cover 102 close to the port, the second wear-resistant teeth 8 are used to protect the outer wall of the barrel cover 102, prevent the outer wall of the barrel cover from being worn and thinned, the material of the second wear-resistant teeth 8 can be, for example, wear-resistant alloy steel, the height h of the second wear-resistant teeth 8 protruding out of the outer wall of the barrel cover is set to be less than the difference between the inner wall radius of the butt joint part 2032 and the outer wall radius of the barrel cover 102, so that the second wear-resistant teeth 8 do not affect the main drill bit 1 entering the butt joint part 2032, h can be, for example, 2-3 mm. Figure 1 、 Figure 5 、 Figure 7 、 Figure 8 、 Figure 9 As shown in FIG. 1, the other end of the barrel cover 102 is closed and connected to the transition part 1016 of the drill bit main body 101 through the annular plate 6, the roller cone 1013 extends out of the barrel cover 102, for example, 5-10 mm, a plurality of cylindrical second wear-resistant teeth 8 radially extending out of the barrel cover 102 are arranged in an annular array on the outer wall of the barrel cover 102 close to the port, the second wear-resistant teeth 8 are used to protect the outer wall of the barrel cover 102, prevent the outer wall of the barrel cover from being worn and thinned, the material of the second wear-resistant teeth 8 can be, for example, wear-resistant alloy steel, the height h of the second wear-resistant teeth 8 protruding out of the outer wall of the barrel cover is set to be less than the difference between the inner wall radius of the butt joint part 2032 and the outer wall radius of the barrel cover 102, so that the second wear-resistant teeth 8 do not affect the main drill bit 1 entering the butt joint part 2032, h can be, for example, 2-3 mm.
[0044] The butt joint process of the guiding butt joint drilling tool is as follows:
[0045] The main drill bit 1 is connected to the main drill machine, and the auxiliary drill bit 2 is connected to the auxiliary drill machine, the main drill machine and the auxiliary drill machine are respectively controlled by the control systems, the main drill bit 1 and the auxiliary drill bit 2 are connected to each other after entering the butt joint area, the auxiliary drill bit 2 is pulled out along the guide hole and replaced by the auxiliary drill bit 2 of the utility model after being disassembled, the auxiliary drill bit 2 is not rotated and advanced during the butt joint process, the main drill bit 1 continues to rotate and advance, the main drill bit 1 enters the lead-in cylinder 202 first during the advancing process of the main drill bit 1, the main drill bit 1 is guided to enter the guide cylinder 201 smoothly, the guide cylinder 201 limits the rotation speed of the main drill bit 1, the main drill bit 1 is continuously advanced, when the main drill bit 1 is pushed into the butt joint part, the pressure and position signals fed back by the main drill bit 1 are used to control the special-shaped clamping key 103 to enter the axial long groove 301, the arc-shaped groove 302 and the fixed groove 303 in sequence, specifically, when the special-shaped clamping key 103 is rotated to the opening of the axial long groove 301, the special-shaped clamping key 103 enters the axial long groove 301, the main drill bit 1 stops rotating, the main drill bit is continuously advanced, the special-shaped clamping key moves to the end of the axial long groove, the main drill bit is rotated to make the special-shaped clamping key 103 enter the arc-shaped groove and rotate to the limit position along the arc-shaped groove 302, the main drill bit is pulled back, the special-shaped clamping key 103 returns to the fixed groove 303, the special-shaped clamping key is locked in the fixed groove, the main drill bit 1 and the auxiliary drill bit 2 are connected as a whole, the auxiliary drill bit 2 is pulled back, the auxiliary drill machine pulls out the main drill bit and the auxiliary drill bit connected as a whole, and the guiding work is realized.
[0046] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as limiting the patent application scope. It should be noted that, for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.
Claims
1. A steerable butt-connection drill tool, characterized in that, The utility model relates to a kind of drilling machine, which includes the main drill bit (1) arranged at one side of main drilling machine and the auxiliary drill bit (2) arranged at one side of auxiliary drilling machine and butts with main drill bit (1), and main drill bit (1) includes drill bit main body (101), barrel cover (102) wrapped drill bit main body (101), a plurality of special-shaped keys (103) arranged on the outer wall of barrel cover (102), and auxiliary drill bit (2) includes the pilot barrel (201) for guiding main drill bit (1), the introduction barrel (202) connected with one end of pilot barrel (201) and used for preliminary introduction of main drill bit (1), and the butt barrel (203) connected with the other end of pilot barrel (201), and the inside of butt barrel (203) is provided with a plurality of card slots (3) for entering and locking special-shaped keys (103).
2. The pilot butt drill string of claim 1, wherein, The butt barrel (203) includes a first connecting portion (2031) and a butt portion (2032) integrally formed with the first connecting portion (2031), the first connecting portion (2031) is a truncated cone body with one end large and the other end small, the outer surface of the first connecting portion (2031) is provided with a first thread (2033) for connecting with a drill rod, and the center of the first connecting portion (2031) is provided with an axial first mud hole (2034), the butt portion (2032) is a circular cylinder, the outer diameter of the butt portion (2032) is not less than the outer diameter of the pilot barrel (201), and the inner diameter of the butt portion (2032) is less than the inner diameter of the pilot barrel (201).
3. The pilot butt drill string of claim 2, wherein, The card slots (3) are at least two, and a plurality of card slots (3) are arranged in a circumferential array around the axis of the butt portion (2032), and the card slots (3) are arranged on the inner wall of the butt portion (2032).
4. The steerable opposite-acting drill tool of claim 2 or 3, wherein, Each card slot (3) is L-shaped, and the card slot (3) includes an axial long slot (301), an arc-shaped slot (302) in communication with the end of the axial long slot (301) and extending along the circumference of the butt portion (2032), and a fixing slot (303) in communication with the arc-shaped slot (302), the axial long slot (301) and the fixing slot (303) are arranged on the same side of the arc-shaped slot (302), and the axial long slot (301) is provided with an opening (304) for entering the special-shaped key (103).
5. The pilot butt drill string of claim 2, wherein, A spacing portion (4) is arranged between the inner cavity of the butt portion (2032) and the first mud hole (2034), a plurality of first cleaning nozzles (5) penetrating into the inner cavity of the butt portion (2032) are arranged on the side wall of the first connecting portion (2031), the first cleaning nozzles (5) are inclined towards the card slots (3), one group of first cleaning nozzles (5) corresponds to one card slot (3), at least three first cleaning nozzles (5) are arranged in each group, and the first cleaning nozzles (5) in the same group are arranged in different directions and respectively face the axial long slot (301), the arc-shaped slot (302) and the fixing slot (303).
6. The pilot butt drill string of claim 1, wherein, The pilot barrel (201) is a circular straight cylinder, and the wall thickness of the pilot barrel (201) is consistent with the wall thickness of the introduction barrel (202).
7. The steerable opposite-acting drill tool of claim 1 or 6, wherein, The introduction cylinder (202) is a circular truncated cone, the small-diameter end of the introduction cylinder (202) is connected with the pilot cylinder (201), and a cylindrical first wear tooth (7) is arranged in an annular array on the outer surface of the large-diameter end of the introduction cylinder (202) close to the port, and the diameter of the large-diameter end of the introduction cylinder (202) is 1.5-2 times the diameter of the small-diameter end.
8. The pilot butt drill string of claim 1, wherein, The drill bit body (101) comprises a plurality of blades (1011), a cantilever shaft (1012) fixed on the blades (1011), a cone (1013) rotatably connected to the cantilever shaft (1012), cutting teeth (1014) distributed on the cone (1013), and a second cleaning nozzle (1015) arranged between the blades (1011). The roots of the plurality of blades (1011) are connected to form a transition portion (1016) and are connected to a second connecting portion (1017), the second connecting portion (1017) is a truncated cone with one end large and the other end small, the outer surface of the second connecting portion (1017) is provided with a second thread (1018) for connecting with a mud motor at the front end of a drill rod, and the center of the second connecting portion (1017) is provided with an axial second mud hole (1019), the second cleaning nozzle (1015) penetrates through the transition portion (1016) and communicates with the second mud hole (1019).
9. The pilot tandem drill string of claim 8, wherein, One end of the cylinder cover (102) is open for the cone (1013) to extend out, and the other end is closed and connected to the transition portion (1016) of the drill bit body (101) through the annular plate (6), and the outer wall of the cylinder cover (102) close to the port is arranged in an annular array with cylindrical second wear teeth (8) extending radially along the cylinder cover.
10. The pilot tandem drill string of claim 9, wherein, The distribution position and number of the special-shaped keys (103) correspond to the distribution position and number of the key grooves (3), the special-shaped keys (103) are arc protrusions, the special-shaped keys (103) have an outer arc surface (1031) parallel to the outer wall of the cylinder cover (102), a vertical surface (1032) and an inclined surface (1033) arranged between the outer arc surface (1031) and the outer wall of the cylinder cover (102), the longitudinal section of the special-shaped key (103) is a right trapezoid, the inclined surface (1033) is formed on the side of the special-shaped key (103) facing the port of the cylinder cover (102), and the inner edge of the inclined surface (1033) coincides with the outer edge of the port of the cylinder cover (102).