CN111456664A - Core drilling tool capable of preventing core from blocking - Google Patents
Core drilling tool capable of preventing core from blocking Download PDFInfo
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- CN111456664A CN111456664A CN202010302126.XA CN202010302126A CN111456664A CN 111456664 A CN111456664 A CN 111456664A CN 202010302126 A CN202010302126 A CN 202010302126A CN 111456664 A CN111456664 A CN 111456664A
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- 238000005553 drilling Methods 0.000 title claims abstract description 34
- 230000000903 blocking effect Effects 0.000 title description 4
- 239000000725 suspension Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 230000000149 penetrating effect Effects 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 abstract description 14
- 239000011435 rock Substances 0.000 abstract description 13
- 230000000694 effects Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000036314 physical performance Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/107—Fishing for or freeing objects in boreholes or wells using impact means for releasing stuck parts, e.g. jars
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Marine Sciences & Fisheries (AREA)
- Earth Drilling (AREA)
Abstract
A core drill capable of preventing core blockage comprises: the core drilling tool comprises a suspension part, a first double female joint, a second double female joint, a ball seat part, an inner pipe, a drill bit, a drill string and an outer pipe; the lower end of the drill string is connected with the upper end of the suspension part; the inner wall of the upper end of the first double female joint is in threaded connection with the outer wall of the lower end of the suspension part; the outer wall of the upper end of the outer pipe is in threaded connection with the inner wall of the lower end of the suspension part; the lower end of the outer pipe is connected with a drill bit; the inner wall of the lower end of the double female joint II is connected with the outer wall of the upper end of the ball seat part; an impact part, a trigger part and a struck part are additionally arranged; the impact part and the trigger part are matched to impact the impacted part, so that the blocked rock core in the inner pipe is loosened by vibration. The invention can unblock the blocked rock core in the inner pipe by adjusting the hydraulic pressure of the drilling fluid, has strong practicability, can unblock in time, greatly improves the drilling efficiency and reduces the engineering cost.
Description
Technical Field
The invention relates to a core drilling tool, in particular to a core drilling tool which can dredge a core at the bottom of the ground without lifting the core drilling tool out of the ground when the core is blocked, and belongs to the technical field of geological exploration.
Background
In geological exploration activities, the key link of coring is seldom realized no matter in the detection of rock strata or the detection of petroleum strata. The core with different depths is taken out from the ground through coring operation, then the taken out core is subjected to data acquisition, and the data is analyzed to obtain the mechanical and physical performance parameters of the rock in the deep stratum, so that the information of the drilled stratum is known, and the safe and efficient development of drilling and production operation is guaranteed. In the current coring operation, the coring tool breaks the core from the stratum in a mode of clamping the core and takes out the core, and for a harder stratum, the coring tool is very practical and has a high coring success rate, but for a breakable stratum, the success rate of the coring tool is very low, and even coring fails; in the process of coring operation on a fractured stratum, the rock core is broken due to vibration or self reasons after entering the inner cylinder, and the broken rock core is not columnar and is easy to block; at present, when the core is blocked, the core drilling tool is generally lifted out of the ground, and then the blocked core is manually disassembled, but the method usually prolongs the coring operation period, and the acquisition of stratum data at a key layer position fails, possibly causes the collapse of a well wall and the failure of coring; therefore, it is necessary to design a simple, economical, reliable and convenient core drill capable of preventing the core from being blocked in combination with the difficulty of practical operation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a core drilling tool capable of preventing core blockage, which not only can remove the blockage of the blocked core in an inner pipe, but also can continuously remove the blockage, thereby achieving the purpose of removing the blockage along with the blockage, obviously improving the success rate of coring and greatly reducing the cost of coring operation.
The problems of the invention are solved by the following technical scheme:
a core drill capable of preventing core blockage comprises: the core drilling tool comprises a suspension part, a first double female joint, a second double female joint, a ball seat part, an inner pipe, a drill bit, a drill string and an outer pipe; the lower end of the drill string is connected with the upper end of the suspension part; the inner wall of the upper end of the first double female joint is in threaded connection with the outer wall of the lower end of the suspension part; the outer wall of the upper end of the outer pipe is in threaded connection with the inner wall of the lower end of the suspension part; the lower end of the outer pipe is connected with a drill bit; the inner wall of the lower end of the double female joint II is connected with the outer wall of the upper end of the ball seat part; an impact part, a trigger part and a struck part are additionally arranged; the upper end of the trigger part is in threaded connection with the lower end of the first double-female connector; the trigger portion is disposed within the impact portion; the upper end of the double female joint II is in threaded connection with the lower end of the triggering part; the lower end of the ball seat part is connected with a striking receiving part; the lower end of the impacted part is connected with the inner pipe.
Above-mentioned coring tool that can prevent core jam, the impact portion includes: the device comprises an upper cylinder cover, an upper piston, a return spring I, a piston rod, a piston cylinder, a lower cylinder cover, a return spring II and an impact hammer; the upper end of the upper cylinder cover is in the shape of a hollow disc, and the lower end of the upper cylinder cover is in the shape of a hollow cylinder; the inner diameter of the hollow disc is the same as and coincident with that of the hollow cylinder; the outer diameter of the hollow disc part at the upper end of the upper barrel cover is the same as that of the first double-female connector; the inner wall of the hollow disc part at the upper end of the upper cylinder cover is connected with the trigger part; the upper piston is a hollow disc and is sleeved on the trigger part; the return spring is sleeved on the trigger part, and the upper end of the first return spring is fixed on the lower end face of the upper piston; the piston rod is a hollow round tube with a thick upper part and a thin lower part, the inner diameter of the thicker part of the upper end is equal to that of the thinner part of the lower end, and the outer diameter of the thicker part of the upper end is larger than that of the thinner part of the lower end; the piston rod is sleeved on the trigger part, and the outer diameter of the piston rod is smaller than the inner diameter of the first return spring; the outer diameter of the upper end part of the piston rod is the same as that of the upper piston; the upper end surface of the piston rod is fixedly connected with the lower end of the first return spring; the piston cylinder is a hollow cylinder, the upper part of the piston cylinder is thick, the lower part of the piston cylinder is thin, the inner diameter of the thick part at the upper end is smaller than that of the thin part at the lower end, and the outer diameter of the thick part at the upper end is equal to that of the thin part at the lower end; the inner wall of the upper end of the piston cylinder is in threaded connection with the outer wall of the lower end of the upper cylinder cover; the shape structure of the lower cylinder cover is the same as that of the upper cylinder cover, the upper end of the lower cylinder cover is in the shape of a hollow cylinder, and the lower end of the lower cylinder cover is in the shape of a hollow disc; the outer wall of the upper end of the lower cylinder cover is in threaded connection with the inner wall of the lower end of the piston cylinder; the inner diameter of the lower cylinder cover is larger than the outer diameter of the thinner part at the lower end of the piston rod, and the inner diameter of the lower cylinder cover is smaller than the outer diameter of the thicker part at the upper end of the piston rod; the inner diameter of the return spring II is larger than the outer diameter of the piston rod; the outer diameter of the second return spring is larger than the inner diameter of the lower cylinder cover; the upper end of the second return spring is fixedly connected with the lower end face of the lower cylinder cover; the upper end of the impact hammer is in the shape of a hollow disc, the lower end of the impact hammer is in the shape of a hollow cylinder, the inner diameter of the hollow disc at the upper end of the impact hammer is smaller than that of the hollow cylinder at the lower end of the impact hammer, and the outer diameter of the hollow disc at the upper end of the impact hammer is equal to that of the hollow cylinder at the lower end; the upper end surface of the impact hammer is fixedly connected with the piston rod; the lower end of the second return spring is fixedly connected with the upper end face of the impact hammer.
The core drilling tool capable of preventing the core from being blocked comprises a triggering part and a core blocking part, wherein the triggering part comprises: the inner cylinder, the one-way valve, the floating valve shaft, the pin, the floating valve and the limiting spring; the upper end of the inner cylinder is in threaded connection with the lower end of the first double-female connector; the lower end of the inner wall of the inner cylinder is provided with a conical seat, and a conical through hole is formed in the axis of the conical seat; four one-way valves are circumferentially and symmetrically arranged on the circumference of the inner cylinder; the floating valve shaft is a round rod with a thick upper part and a thin lower part; the float valve is a conical body, and a through hole is formed in the axis direction of the float valve, and the diameter of the through hole is smaller than that of a round rod at the thick end of the float valve shaft and larger than that of a round rod at the thin end of the float valve shaft; the tip of the float valve is downward, and the through hole on the float valve is sleeved on the thin end round rod of the float valve shaft; the thick end part of the floating valve shaft is provided with a through hole on the horizontal plane, the pin passes through the through hole, and two ends of the pin are fixed on the inner wall of the inner cylinder; the inner diameter of the limiting spring is larger than the diameter of the round rod at the thin end of the floating valve shaft and the inner diameter of the vertical through hole of the floating valve, the inner diameter of the limiting spring is smaller than the diameter of the thickest end of the floating valve, the limiting spring is sleeved on the round rod at the thin end of the floating valve shaft, and the upper end of the limiting spring is in contact with the lower end of the floating valve; the shape of the conical inclined plane of the float valve is coincided with the shape of the bevel edge of the conical through hole on the conical seat at the lower end of the inner wall of the inner cylinder.
The core drilling tool capable of preventing the core from being blocked is additionally provided with the core locking pipe assembly; the lock core tube assembly comprises a lock core barrel, a first limiting key, a second limiting key, a limiting hole, a limiting shaft, a clamping groove and a lock core plate; a plurality of limiting grooves are symmetrically arranged on the inner wall of the lower end of the inner pipe in the circumferential direction, and the inner diameter of a circle defined by the limiting grooves is smaller than that of the inner pipe; the lock cylinder is a hollow cylinder, limiting keys I are symmetrically arranged on the outer wall of the lock cylinder in the circumferential direction, the number of the limiting keys I is consistent with that of the limiting grooves, and the limiting keys I are inserted into the limiting grooves and are matched with the limiting grooves; the length of the first limiting key is greater than the height of the lock cylinder; the lock core plate is fan-shaped, and the diameter of the lock core plate is smaller than the diameter of the outer wall of the lock core cylinder and larger than the diameter of the inner wall of the lock core cylinder; the arc edge of the lock core plate is provided with an arc-shaped through hole, and the aperture of the through hole is larger than the diameter of the section of the arc-shaped limiting shaft; the second limiting key is arranged on the upper end face of the lock cylinder, and the second limiting key is positioned right opposite to the inner side of the first limiting key; the height of the horizontal plane of the upper end surface of the second limiting key is smaller than that of the upper end surface of the first limiting key; the second limiting key has two penetrating structures, the adjacent second limiting keys have different penetrating structures, the first penetrating structure is that the second limiting key is provided with an arc-shaped limiting hole in the circumferential direction of the lock cylinder, the arc-shaped limiting block penetrates through two sides of the second limiting key, and the second penetrating structure is that the inner side surface of the second limiting key is provided with a clamping groove in the circumferential direction of the lock cylinder; a groove is formed in the middle of the arc edge of the lock cylinder plate and used for clamping a second limiting key; an arc-shaped through hole is formed in the arc edge of the lock cylinder plate along the arc edge, and the limiting shaft penetrates through the arc-shaped through hole; the middle part of the limiting shaft is clamped in the clamping groove, and two ends of the limiting shaft are arranged in the limiting holes; and a torsion spring is arranged between the upper end surface of the lock cylinder plate and the second limit key.
The core drilling tool capable of preventing the core from being blocked comprises a ball seat, a ball seat body, a water hole II and a conical seat; four water holes II are symmetrically formed in the ball seat body in the circumferential direction and penetrate through the inner wall and the outer wall of the ball seat body; the upper end of a water hole II on the outer wall of the ball seat body is provided with an external thread, and the external thread and the internal thread at the lower end of the double female joint II form threaded connection; a conical seat is arranged at the lower end of a water hole II on the inner wall of the ball seat body; the steel ball is arranged on the conical seat.
According to the core drilling tool capable of preventing the core from being blocked, the impacted part comprises a fastening ring, a limiting ring and an impact joint; the height, the inner diameter and the outer diameter of the fastening ring and the limiting ring are the same, the inner wall of the fastening ring is provided with internal threads, and the inner wall of the limiting ring is smooth; the lower end of a water hole in the outer wall of the ball seat body is provided with an external thread, and the fastening ring and the external thread form threaded connection; the impact joint is divided into an upper end part, a middle end part and a lower end part according to different inner diameters, wherein the outer diameters of the upper end part, the middle end part and the lower end part of the impact joint are the same, and the inner diameters are sequentially reduced; the impact joint is sleeved on the ball seat body, and the upper end surface of the upper end part of the impact joint is contacted with the lower end surface of the fastening ring; the limiting ring is sleeved on the ball seat body, and the upper end face of the limiting ring is in contact with the lower end face of the upper end part of the impact joint; the wall thickness of the limiting ring is equal to the difference of the inner radius of the upper end part and the middle end part of the impact joint; the lower end surface of the limiting ring is contacted with the coarse and fine variable diameter step at the lower end of the ball seat body; the inner wall of the lower end part of the impact joint is in threaded connection with the outer wall of the upper end of the inner pipe.
According to the core drilling tool capable of preventing the core from being blocked, the double female connectors II comprise the water holes I, the closed grooves and the connecting sleeves; the cross section of the connecting sleeve is H-shaped; inner threads are arranged on the inner walls of the upper end and the lower end of the connecting sleeve; the internal thread of the inner wall of the upper end of the connecting sleeve is in threaded connection with the lower end of the inner cylinder; the upper end surface of the middle disc part of the connecting sleeve is provided with an incompletely-penetrated closed groove; the closed groove is in interference fit with the lower end of the floating valve rod; the four water holes are symmetrically arranged at the upper end of the connecting sleeve in the circumferential direction, and the first water hole penetrates through the connecting sleeve; the first water hole is positioned at the lower end of the inner barrel and at the upper end of the middle part of the double female joint.
The core drilling tool capable of preventing the core from being blocked comprises a suspension part, a support part and a core shaft, wherein the suspension part comprises a bearing seat, an upper bearing, a lower bearing and the core shaft; the upper bearing and the lower bearing are the same in structure size; the mandrel is a cylinder with a thick middle part and thin two ends; the inner wall of the upper bearing is in interference fit with the outer wall of the upper end of the mandrel; the inner wall of the lower bearing is in interference fit with the outer wall of the lower end of the mandrel; the outer wall of the outer ring of the upper bearing is in interference fit with the inner wall of the upper end of the bearing seat; the outer wall of the lower bearing outer ring is in interference fit with the inner wall of the lower end of the bearing seat; the upper end of the bearing seat is in threaded connection with the lower end of the drill column; the shaft axes of the bearing seat, the upper bearing, the lower bearing and the mandrel are the same line.
According to the invention, the blocking and blockage removing capability of the drilling device is effectively improved through the impact part, the trigger part and the impacted part, and the situation that once the rock core is blocked in the inner pipe in the conventional drilling process, the whole drilling device can only be lifted out of the ground for blockage removal is avoided; the impact part is matched with the trigger part, a reciprocating impact hammer is provided in the inner pipe, under the condition that the rock core is clamped in the inner pipe, the impact hammer which moves in a reciprocating mode continuously strikes the impacted part, so that the inner pipe connected with the impacted part is vibrated, small blocks or particles of the blocked rock core are vibrated to be loose or even broken by the vibrated inner pipe, and the aim of releasing the clamping without lifting the equipment out of the ground is achieved.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic view of a lock barrel assembly according to the present invention;
FIG. 3 is a schematic view of a barrel plate according to the present invention;
FIG. 4 is an enlarged view of a portion of invention B;
fig. 5 is a partially enlarged view of the present invention a.
The list of labels in the figure is: 1. the double female connectors comprise a first female connector, a second female connector, an inner pipe, a third female connector, a drill bit, a fourth female connector, a drill string, a fourth female connector, an outer pipe, a fourth female connector, an upper cylinder cover, a fourth female connector, an upper piston, a fourth female connector, a piston rod, a piston cylinder, a fourth female connector, a fourth, 44. through hole, 45, pressure relief groove.
Detailed Description
Referring to fig. 1, 2, 3, 4 and 5, the present invention includes a hanging portion, a double box one 1, a double box two, a ball seat portion, an inner pipe 2, a drill bit 3, a drill string 4 and an outer pipe 5; the lower end of the drill string 4 is connected with the upper end of the suspension part; the inner wall of the upper end of the first double female joint 1 is in threaded connection with the outer wall of the lower end of the suspension part; the outer wall of the upper end of the outer pipe 5 is in threaded connection with the inner wall of the lower end of the suspension part; the lower end of the outer pipe 5 is connected with a drill bit 3; the inner wall of the lower end of the double female joint II is connected with the outer wall of the upper end of the ball seat part; an impact part, a trigger part, a struck part and a lock barrel assembly are additionally arranged; the upper end of the trigger part is in threaded connection with the lower end of the first double-female connector 1; the trigger part is arranged on the impact part; the upper end of the double female joint II is in threaded connection with the lower end of the triggering part; the lower end of the ball seat part is connected with a striking receiving part; the lower end of the impacted part is connected with an inner pipe 2; the lower end of the inner tube 2 is clamped with the lock cylinder tube assembly.
In order to provide a continuous impact force for the impacted part, the invention is additionally provided with an impact part and a trigger part; the impact portion includes: the device comprises an upper cylinder cover 6, an upper piston 7, a first return spring 8, a piston rod 9, a piston cylinder 10, a lower cylinder cover 11, a second return spring 12 and an impact hammer 13; the trigger part includes: the inner cylinder 14, the one-way valve 15, the floating valve shaft 16, the pin 17, the floating valve 18 and the limiting spring 19; the upper end of the inner cylinder 14 is in threaded connection with the lower end of the first double-female connector 1; a conical seat 20 is arranged at the lower end of the inner wall of the inner cylinder 14, and a conical through hole is arranged on the axis of the conical seat 20; four check valves 15 are symmetrically arranged on the circumference of the inner cylinder 14 in the circumferential direction, the check valves 15 are communicated with the inner side and the outer side of the inner cylinder 14, and fluid can flow from the inside of the inner cylinder 14 to the outside of the inner cylinder 14 through the check valves 15; the upper end of the upper cylinder cover 6 is in the shape of a hollow disc, and the lower end of the upper cylinder cover is in the shape of a hollow cylinder; the inner diameter of the hollow disc is the same as and coincident with that of the hollow cylinder; the outer diameter of the hollow disc part at the upper end of the upper barrel cover 6 is the same as that of the first double-female joint 1; the inner wall of the hollow disc part at the upper end of the upper barrel cover 6 is in threaded connection with the outer wall of the inner barrel 14; the upper piston 7 is a hollow disc, the upper piston 7 is sleeved on the inner cylinder 14, and the inner diameter of the upper piston 7 is 0.3-0.5cm larger than the outer diameter of the inner cylinder 14; the first return spring 8 is sleeved on the outer wall of the inner cylinder 14, and the upper end of the first return spring 8 is fixed on the lower end face of the upper piston 7; the piston rod 9 is a hollow round tube with a thick upper part and a thin lower part, the inner diameter of the thicker part of the upper end is equal to that of the thinner part of the lower end, and the outer diameter of the thicker part of the upper end is larger than that of the thinner part of the lower end; the piston rod 9 is sleeved on the inner cylinder 14, the inner diameter of the piston rod 9 is 0.2-0.3cm larger than the outer diameter of the inner cylinder 14, and the outer diameter of the piston rod 9 is smaller than the inner diameter of the first return spring 8; the outer diameter of the upper end part of the piston rod 9 is the same as that of the upper piston 7; the upper end surface of the piston rod 9 is fixedly connected with the lower end of the return spring I8; the piston cylinder 10 is a hollow cylinder, the upper part of the piston cylinder is thick, the lower part of the piston cylinder is thin, the inner diameter of the thick part at the upper end is smaller than that of the thin part at the lower end, and the outer diameter of the thick part at the upper end is equal to that of the thin part at the lower end; the inner wall of the upper end of the piston cylinder 10 is in threaded connection with the outer wall of the lower end of the upper cylinder cover 6; the shape and structure of the lower cylinder cover 11 are the same as those of the upper cylinder cover 6, the upper end of the lower cylinder cover 11 is a hollow cylinder, and the lower end of the lower cylinder cover 11 is a hollow disc; the outer wall of the upper end of the lower cylinder cover 11 is in threaded connection with the inner wall of the lower end of the piston cylinder 10; the inner diameter of the lower cylinder cover 11 is larger than the outer diameter of the thinner part at the lower end of the piston rod 9, and the inner diameter of the lower cylinder cover 11 is smaller than the outer diameter of the thicker part at the upper end of the piston rod 9; the inner diameter of the second return spring 12 is larger than the outer diameter of the piston rod 9; the outer diameter of the second return spring 12 is larger than the inner diameter of the lower cylinder cover 11; the upper end of the second return spring 12 is fixedly connected with the lower end face of the lower cylinder cover 11; the upper end of the impact hammer 13 is in the shape of a hollow disc, the lower end of the impact hammer 13 is in the shape of a hollow cylinder, the inner diameter of the hollow disc at the upper end of the impact hammer 13 is smaller than that of the hollow cylinder at the lower end of the impact hammer 13, and the outer diameter of the hollow disc at the upper end of the impact hammer 13 is equal to that of the hollow cylinder at the lower end; the upper end surface of the impact hammer 13 is fixedly connected with the piston rod 9; the lower end of the second return spring 12 is fixedly connected with the upper end surface of the impact hammer 13; the floating valve shaft 16 is a round rod with a thick upper part and a thin lower part; the float valve 18 is a conical body, and is provided with a through hole in the axis direction, and the diameter of the through hole is smaller than the diameter of the thick end round rod of the float valve shaft 16 and larger than the diameter of the thin end round rod of the float valve shaft 16; the tip of the float valve 18 is downward, a through hole on the float valve 18 is sleeved on a thin end round rod of the float valve shaft 16, and the float valve 18 can move up and down on the float valve shaft 16; the thick end part of the floating valve shaft 16 is provided with a through hole on the horizontal plane, a pin 17 passes through the through hole, and two ends of the pin 17 are fixed on the inner wall of the inner cylinder 14; the inner diameter of the limiting spring 19 is larger than the diameter of the thin-end round rod of the floating valve shaft 16 and the inner diameter of the vertical through hole of the floating valve 18, the inner diameter of the limiting spring 19 is smaller than the diameter of the thickest end of the floating valve 18, the limiting spring 19 is sleeved on the thin-end round rod of the floating valve shaft 16, and the upper end of the limiting spring 19 is in contact with the lower end of the floating valve 18; the presence of the limit spring 19 allows the float valve 18 to move downwards only when it is subjected to a downward pressure; the shape of the conical inclined plane of the float valve 18 is coincided with the shape of the inclined edge of the conical through hole on the conical seat 20 at the lower end of the inner wall of the inner cylinder 14; when the float valve 18 moves to the lower end and coincides with the tapered through hole, the lower end of the inner cylinder 14 is blocked, so that the fluid in the inner cylinder 14 will flow out of the inner cylinder 14 through the check valve 15; when the lower end of the inner cylinder 14 is blocked, fluid in the inner cylinder 14 flows into the piston cylinder 10 through the check valve 15, the high-pressure fluid provides high-pressure thrust to push the upper piston 7 downwards, the first return spring 8 also moves downwards, then the piston rod 9 drives the impact hammer 13 to move downwards under the action of the first return spring 8, and the second return spring 12 is stretched.
In order to prevent the rock core from separating from the rock core in the process of lifting out the drilling device, a core locking pipe assembly is additionally arranged; a plurality of limiting grooves 21 are symmetrically arranged on the inner wall of the lower end of the inner pipe 2 in the circumferential direction, and the inner diameter of a circle formed by the limiting grooves 21 is smaller than that of the inner pipe 2; the lock cylinder tube assembly comprises a lock cylinder barrel 22, a first limiting key 23, a second limiting key 24, a limiting hole 25, a limiting shaft 26, a clamping groove 27 and a lock cylinder plate 28; the lock cylinder barrel 22 is a hollow cylinder, limiting keys I23 are symmetrically arranged on the outer wall of the lock cylinder barrel in the circumferential direction, the number of the limiting keys I23 is consistent with that of the limiting grooves 21, and the limiting keys I23 are inserted into the limiting grooves 21 and are matched with the limiting grooves for limiting the movement of the lock cylinder pipe assembly; the length of the first limiting key 23 is greater than the height of the lock cylinder 22; the lock core plate 28 is fan-shaped, and the diameter of the lock core plate 28 is smaller than the diameter of the outer wall of the lock core cylinder 22 and larger than the diameter of the inner wall of the lock core cylinder 22; the arc edge of the lock cylinder plate 28 is provided with an arc-shaped through hole 44, and the aperture of the through hole 44 is larger than the section diameter of the arc-shaped limiting shaft 26; the second limit key 24 is arranged on the upper end face of the lock cylinder 22, and the second limit key 24 is positioned right opposite to the inner side of the first limit key 23; the height of the horizontal plane of the upper end face of the second limit key 24 is smaller than that of the upper end face of the first limit key 23; the second limiting key 24 has two penetrating structures, the penetrating structures of the adjacent second limiting keys 24 are different, the first penetrating structure is that the second limiting key 24 is provided with an arc-shaped limiting hole 25 in the circumferential direction of the lock cylinder 22, the arc-shaped limiting block penetrates through two sides of the second limiting key 24, and the second penetrating structure is that the inner side surface of the second limiting key 24 is provided with a clamping groove 27 in the circumferential direction of the lock cylinder 22; a groove is formed in the middle of the arc edge of the lock cylinder plate 28 and used for clamping the second limit key 24; an arc-shaped through hole is formed in the arc edge of the lock cylinder plate 28 along the arc edge, and the limiting shaft 26 penetrates through the arc-shaped through hole; the middle part of the limiting shaft 26 is clamped in the clamping groove 27, and two ends of the limiting shaft 26 are arranged in the limiting hole 25; a torsion spring 29 is arranged between the upper end surface of the lock cylinder plate 28 and the second limit key 24; the lock core plate 28 can rotate around the limiting shaft 26, when the core moves upwards, the core can push the lock core plate 28 to move upwards, and when the drilling device is hoisted out, the torsional spring 29 pushes the lock core plate 28 to recover, so that the core is prevented from falling off the inner pipe 2.
The ball seat comprises a steel ball 30, a ball seat body 31, a second water hole 32 and a conical seat 33; four water holes 32 are symmetrically arranged on the ball seat body 31 in the circumferential direction, and the water holes 32 penetrate through the inner wall and the outer wall of the ball seat body 31; the upper end of a water hole II 32 on the outer wall of the ball seat body 31 is provided with an external thread, and the external thread and the internal thread at the lower end of the double female joint II form threaded connection; a conical seat 33 is arranged at the lower end of a water hole second 32 on the inner wall of the ball seat body 31; the steel ball 30 is arranged on the conical seat 33; the steel ball 30 is placed on the conical seat 33 at first, when the drilling device descends, the core enters the inner pipe 2, the inner pipe 2 is filled with drilling fluid, the core pushes the drilling fluid to move upwards, so that the drilling fluid in the inner pipe 2 is upwards extruded to push the steel ball 30 out of the conical seat 33, and the drilling fluid enters the ball seat body 31 through a channel on the conical seat 33 and is discharged from the second water hole 32.
The impacted part comprises a fastening ring 34, a limiting ring 35 and an impact joint 36; the height and the inner and outer diameters of the fastening ring 34 and the limiting ring 35 are the same, the inner wall of the fastening ring 34 is provided with internal threads, and the inner wall of the limiting ring 35 is smooth; the lower end of a water hole in the outer wall of the ball seat body 31 is provided with an external thread, and the fastening ring 34 and the external thread form threaded connection; the impact joint 36 is divided into an upper end part, a middle end part and a lower end part according to different inner diameters, wherein the outer diameters of the upper end part, the middle end part and the lower end part of the impact joint 36 are the same, and the inner diameters are sequentially reduced; the impact joint 36 is sleeved on the tee body 31, and the upper end surface of the upper end part of the impact joint 36 is contacted with the lower end surface of the fastening ring 34; the limiting ring 35 is sleeved on the ball seat body 31, and the upper end surface of the limiting ring 35 contacts the lower end surface of the upper end part of the impact joint 36; the wall thickness of the stop collar 35 is equal to the difference in the inner radius of the upper and middle portions of the impact joint 36; the lower end surface of the limit ring 35 contacts the thick and thin variable diameter step at the lower end of the ball seat body 31; the inner wall of the lower end part of the impact joint 36 is in threaded connection with the outer wall of the upper end of the inner pipe 2; the impact hammer 13 continuously strikes the impact joint 36, and the inner pipe 2 vibrates along with the impact joint, so that the core is clamped and loosened in the inner pipe 2, and the purpose of releasing the clamp is achieved.
The double female joint II comprises a water hole I37, a closed groove 38 and a connecting sleeve 39; the cross section of the connecting sleeve 39 is H-shaped; inner threads are arranged on the inner walls of the upper end and the lower end of the connecting sleeve 39; the internal thread of the inner wall of the upper end of the connecting sleeve 39 is connected with the lower end of the inner cylinder 14 through threads; the upper end surface of the middle disc part of the connecting sleeve 39 is provided with a closed groove 38 which is not completely penetrated; the closing groove 38 is in interference fit with the lower end of the float valve shaft 16; the four water holes I37 are circumferentially and symmetrically arranged at the upper end of the connecting sleeve 39, and the water holes I37 penetrate through the inner wall and the outer wall of the connecting sleeve 39; the first water hole 37 is positioned at the lower end of the inner barrel 14 and at the upper end of the middle part of the double female joint.
The suspension portion includes a bearing seat 40, an upper bearing 41, a lower bearing 42, and a spindle 43; the upper bearing 41 and the lower bearing 42 have the same structure and size; the mandrel 43 is a cylinder with a thick middle part and thin two ends; the inner wall of the upper bearing 41 is in interference fit with the outer wall of the upper end of the mandrel 43; the inner wall of the lower bearing 42 is in interference fit with the outer wall of the lower end of the mandrel 43; the outer wall of the outer ring of the upper bearing 41 is in interference fit with the inner wall of the upper end of the bearing seat 40; the outer wall of the outer ring of the lower bearing 42 is in interference fit with the inner wall of the lower end of the bearing seat 40; the upper end of the bearing seat 40 is in threaded connection with the lower end of the drill string 4; the shaft axes of the bearing seat 40, the upper bearing 41, the lower bearing 42 and the mandrel 43 are the same line; the purpose of differential movement between the outer tube 5 and the mandrel 43 is achieved by upper and lower bearings 42.
When the rock core is blocked underground, the hydraulic pressure of the drilling fluid is increased, so that the float valve 18 moves downwards until a channel at the lower end of the inner cylinder 14 is blocked, at the moment, high-pressure liquid in the inner tube 2 flows into the piston cylinder 10 through the one-way valve 15, the high-pressure fluid pushes the upper piston 7 and the first return spring 8 to move downwards, so that the piston rod 9 and the impact hammer 13 are pushed to move downwards, when the upper piston 7 moves to the same horizontal line of a pressure relief groove 45 in the middle of the piston cylinder 10, the drilling fluid enters the pressure relief groove 45, at the moment, the hydraulic pressure at the upper part of the upper piston 7 is suddenly reduced, the fluid pressure at the upper part of the upper piston 7 is gradually reduced, and the second return spring 12 is; after the impact hammer 13 impacts the impact joint 36, the impact hammer starts to move upwards under the action of the tension of the first return spring 8 and the second return spring 12 and the pressure difference between the upper piston 7 and the lower piston; so relapse, the impact hammer lasts to strike joint 36, and under the effect of striking force, the rock core in inner tube 2 is shaken the pine to realize the purpose of deblocking and unfreezing, when drilling equipment can normally descend, resume normal drilling fluid hydraulic pressure, the float valve resets under limiting spring 19's effect, and the intraductal passageway is opened, thereby continues to develop work.
Claims (8)
1. A core drill capable of preventing core blockage comprises: the core drilling tool comprises a suspension part, a first double female joint (1), a second double female joint, a ball seat part, an inner pipe (2), a drill bit (3), a drill string (4) and an outer pipe (5); the lower end of the drill string (4) is connected with the upper end of the suspension part; the inner wall of the upper end of the double-female joint I (1) is in threaded connection with the outer wall of the lower end of the suspension part; the outer wall of the upper end of the outer pipe (5) is in threaded connection with the inner wall of the lower end of the suspension part; the lower end of the outer pipe (5) is connected with a drill bit (3); the inner wall of the lower end of the double female joint II is connected with the outer wall of the upper end of the ball seat part; the method is characterized in that: an impact part, a trigger part and a struck part are additionally arranged; the upper end of the trigger part is in threaded connection with the lower end of the first double-female connector (1); the trigger portion is disposed within the impact portion; the upper end of the double female joint II is in threaded connection with the lower end of the triggering part; the lower end of the ball seat part is connected with a striking receiving part; the lower end of the impacted part is connected with an inner tube (2).
2. The core drill capable of preventing core blockage according to claim 1, characterized in that: the impact portion includes: the device comprises an upper cylinder cover (6), an upper piston (7), a first return spring (8), a piston rod (9), a piston cylinder (10), a lower cylinder cover (11), a second return spring (12) and an impact hammer (13); the upper end of the upper cylinder cover (6) is in the shape of a hollow disc, and the lower end of the upper cylinder cover is in the shape of a hollow cylinder; the inner diameter of the hollow disc is the same as and coincident with that of the hollow cylinder; the outer diameter of the hollow disc part at the upper end of the upper cylinder cover (6) is the same as that of the first double-female connector (1); the inner wall of the hollow disc part at the upper end of the upper cylinder cover (6) is connected with the trigger part; the upper piston (7) is a hollow disc and is sleeved on the trigger part; the first return spring (8) is sleeved on the trigger part, and the upper end of the first return spring (8) is fixed on the lower end face of the upper piston (7); the piston rod (9) is a hollow round tube with a thick upper part and a thin lower part, the inner diameter of the thicker part of the upper end is equal to that of the thinner part of the lower end, and the outer diameter of the thicker part of the upper end is larger than that of the thinner part of the lower end; the piston rod (9) is sleeved on the trigger part, and the outer diameter of the piston rod (9) is smaller than the inner diameter of the first return spring (8); the outer diameter of the upper end part of the piston rod (9) is the same as that of the upper piston (7); the upper end surface of the piston rod (9) is fixedly connected with the lower end of the return spring I (8); the piston cylinder (10) is a hollow cylinder, the upper part of the piston cylinder is thick, the lower part of the piston cylinder is thin, the inner diameter of the thick part at the upper end is smaller than that of the thin part at the lower end, and the outer diameter of the thick part at the upper end is equal to that of the thin part at the lower end; a pressure relief groove (45) is formed in the middle of the inner wall of the piston cylinder (10); the inner wall of the upper end of the piston cylinder (10) is in threaded connection with the outer wall of the lower end of the upper cylinder cover (6); the shape and structure of the lower cylinder cover (11) are the same as those of the upper cylinder cover (6), the upper end of the lower cylinder cover (11) is in the shape of a hollow cylinder, and the lower end of the lower cylinder cover is in the shape of a hollow disc; the outer wall of the upper end of the lower cylinder cover (11) is in threaded connection with the inner wall of the lower end of the piston cylinder (10); the inner diameter of the lower cylinder cover (11) is larger than the outer diameter of the thinner part at the lower end of the piston rod (9), and the inner diameter of the lower cylinder cover (11) is smaller than the outer diameter of the thicker part at the upper end of the piston rod (9); the inner diameter of the second return spring (12) is larger than the outer diameter of the piston rod (9); the outer diameter of the second return spring (12) is larger than the inner diameter of the lower cylinder cover (11); the upper end of the second return spring (12) is fixedly connected with the lower end face of the lower cylinder cover (11); the upper end of the impact hammer (13) is in the shape of a hollow disc, the lower end of the impact hammer (13) is in the shape of a hollow cylinder, the inner diameter of the hollow disc at the upper end of the impact hammer (13) is smaller than that of the hollow cylinder at the lower end of the impact hammer (13), and the outer diameter of the hollow disc at the upper end of the impact hammer (13) is equal to that of the hollow cylinder at the lower end; the upper end surface of the impact hammer (13) is fixedly connected with the piston rod (9); the lower end of the second return spring (12) is fixedly connected with the upper end face of the impact hammer (13).
3. The core drill capable of preventing core blockage according to claim 2, characterized in that: the trigger part includes: the inner cylinder (14), the one-way valve (15), the floating valve shaft (16), the pin (17), the floating valve (18) and the limiting spring (19); the upper end of the inner cylinder (14) is in threaded connection with the lower end of the double-female joint I (1); the lower end of the inner wall of the inner cylinder (14) is provided with a conical seat (20), and a conical through hole is formed in the axis of the conical seat (20); four one-way valves (15) are circumferentially and symmetrically arranged on the circumference of the inner cylinder (14); the floating valve shaft (16) is a round rod with a thick upper part and a thin lower part; the float valve (18) is a conical body, and is provided with a through hole in the axis direction, and the diameter of the through hole is smaller than the diameter of a thick end round rod of the float valve shaft (16) and larger than the diameter of a thin end round rod of the float valve shaft (16); the tip of the float valve (18) faces downwards, and a through hole on the float valve (18) is sleeved on a thin end round rod of the float valve shaft (16); the thick end part of the floating valve shaft (16) is provided with a through hole on the horizontal plane, a pin (17) passes through the through hole, and two ends of the pin (17) are fixed on the inner wall of the inner cylinder (14); the inner diameter of the limiting spring (19) is larger than the diameter of a round rod at the thin end of the floating valve shaft (16) and the inner diameter of a vertical through hole of the floating valve (18), the inner diameter of the limiting spring (19) is smaller than the diameter of the thickest end of the floating valve (18), the limiting spring (19) is sleeved on the round rod at the thin end of the floating valve shaft (16), and the upper end of the limiting spring (19) is in contact with the lower end of the floating valve (18); the shape of the conical inclined plane of the float valve (18) is coincided with the shape of the inclined edge of the conical through hole on the conical seat (20) at the lower end of the inner wall of the inner cylinder (14).
4. A core drilling tool capable of preventing core blockage according to claim 3, wherein: a lock barrel assembly is additionally arranged; the lock cylinder tube assembly comprises a lock cylinder barrel (22), a first limiting key (23), a second limiting key (24), a limiting hole (25), a limiting shaft (26), a clamping groove (27) and a lock cylinder plate (28); a plurality of limiting grooves (21) are symmetrically arranged on the inner wall of the lower end of the inner pipe (2) in the circumferential direction, and the inner diameter of a circle defined by the limiting grooves (21) is smaller than that of the inner pipe (2); the lock cylinder (22) is a hollow cylinder, limiting keys I (23) are symmetrically arranged on the outer wall of the lock cylinder in the circumferential direction, the number of the limiting keys I (23) is consistent with that of the limiting grooves (21), and the limiting keys I (23) are inserted into the limiting grooves (21) and are matched with the limiting grooves; the length of the first limiting key (23) is greater than the height of the lock cylinder (22); the lock core plate (28) is fan-shaped, and the diameter of the lock core plate (28) is smaller than the diameter of the outer wall of the lock core cylinder (22) and larger than the diameter of the inner wall of the lock core cylinder (22); the arc edge of the lock core plate (28) is provided with an arc-shaped through hole (44), and the aperture of the through hole (44) is larger than the section diameter of the arc-shaped limiting shaft (26); the second limiting key (24) is arranged on the upper end face of the lock cylinder (22), and the second limiting key (24) is positioned right opposite to the inner side of the first limiting key (23); the horizontal height of the upper end face of the second limiting key (24) is smaller than that of the upper end face of the first limiting key (23); the second limiting key (24) is provided with two penetrating structures, the penetrating structures of the adjacent second limiting keys (24) are different, the first penetrating structure is that the second limiting key (24) is provided with an arc-shaped limiting hole (25) in the circumferential direction of the lock cylinder (22), the arc-shaped limiting block penetrates through two sides of the second limiting key (24), and the second penetrating structure is that the inner side surface of the second limiting key (24) is provided with a clamping groove (27) in the circumferential direction of the lock cylinder (22); a groove is arranged in the middle of the arc edge of the lock cylinder plate (28) and used for clamping the second limit key (24); an arc-shaped through hole is formed in the arc edge of the lock cylinder plate (28) along the arc edge, and the limiting shaft (26) penetrates through the arc-shaped through hole; the middle part of the limiting shaft (26) is clamped in the clamping groove (27), and two ends of the limiting shaft (26) are arranged in the limiting hole (25); and a torsion spring (29) is arranged between the upper end surface of the lock core plate (28) and the second limit key (24).
5. The core drill capable of preventing core blockage according to claim 4, wherein: the ball seat comprises a steel ball (30), a ball seat body (31), a second water hole (32) and a conical seat (33); four water holes II (32) are symmetrically formed in the ball seat body (31) in the circumferential direction, and the water holes II (32) penetrate through the inner wall and the outer wall of the ball seat body (31); the upper end of a water hole II (32) on the outer wall of the ball seat body (31) is provided with an external thread, and the external thread and the internal thread at the lower end of the double female joint II form a threaded connection; a conical seat (33) is arranged at the lower end of a water hole II (32) on the inner wall of the ball seat body (31); the steel ball (30) is arranged on the conical seat (33).
6. The core drill capable of preventing core blockage according to claim 5, wherein: the impacted part comprises a fastening ring (34), a limiting ring (35) and an impact joint (36); the height, the inner diameter and the outer diameter of the fastening ring (34) and the limiting ring (35) are the same, the inner wall of the fastening ring (34) is provided with internal threads, and the inner wall of the limiting ring (35) is smooth; the lower end of a water hole in the outer wall of the ball seat body (31) is provided with an external thread, and the fastening ring (34) and the external thread form threaded connection; the impact joint (36) is divided into an upper end part, a middle end part and a lower end part according to different inner diameters, wherein the outer diameters of the upper end part, the middle end part and the lower end part of the impact joint (36) are the same, and the inner diameters are sequentially reduced; the impact joint (36) is sleeved on the ball seat body (31), and the upper end surface of the upper end part of the impact joint (36) is contacted with the lower end surface of the fastening ring (34); the limiting ring (35) is sleeved on the ball seat body (31), and the upper end face of the limiting ring (35) is in contact with the lower end face of the upper end part of the impact joint (36); the wall thickness of the limiting ring (35) is equal to the difference of the inner radius of the upper end part and the middle end part of the impact joint (36); the lower end surface of the limiting ring (35) is contacted with the thick and thin diameter-variable step at the lower end of the ball seat body (31); the inner wall of the lower end part of the impact joint (36) is in threaded connection with the outer wall of the upper end of the inner pipe (2).
7. The core drill capable of preventing core blockage according to claim 6, wherein: the double female joint II comprises a water hole I (37), a closed groove (38) and a connecting sleeve (39); the cross section of the connecting sleeve (39) is H-shaped; inner threads are arranged on the inner walls of the upper end and the lower end of the connecting sleeve (39); the internal thread of the inner wall of the upper end of the connecting sleeve (39) is in threaded connection with the lower end of the inner cylinder (14); the upper end surface of the middle disc part of the connecting sleeve (39) is provided with a closed groove (38) which is not completely penetrated; the closing groove (38) is in interference fit with the lower end of the float valve shaft (16); the four first water holes (37) are circumferentially and symmetrically arranged at the upper end of the connecting sleeve (39), and the first water holes (37) penetrate through the inner wall and the outer wall of the connecting sleeve (39); the first water hole (37) is positioned at the lower end of the inner cylinder (14) and at the upper end of the middle part of the second double female joint.
8. The core drill capable of preventing core blockage according to claim 7, wherein: the suspension part comprises a bearing seat (40), an upper bearing (41), a lower bearing (42) and a mandrel (43); the upper bearing (41) and the lower bearing (42) have the same structure and size; the mandrel (43) is a cylinder with a thick middle part and thin two ends; the inner wall of the upper bearing (41) is in interference fit with the outer wall of the upper end of the mandrel (43); the inner wall of the lower bearing (42) is in interference fit with the outer wall of the lower end of the mandrel (43); the outer wall of the outer ring of the upper bearing (41) is in interference fit with the inner wall of the upper end of the bearing seat (40); the outer wall of the outer ring of the lower bearing (42) is in interference fit with the inner wall of the lower end of the bearing seat (40); the upper end of the bearing seat (40) is in threaded connection with the lower end of the drill string (4); the shaft axes of the bearing seat (40), the upper bearing (41), the lower bearing (42) and the mandrel (43) are the same line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010302126.XA CN111456664A (en) | 2020-04-16 | 2020-04-16 | Core drilling tool capable of preventing core from blocking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010302126.XA CN111456664A (en) | 2020-04-16 | 2020-04-16 | Core drilling tool capable of preventing core from blocking |
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| Publication Number | Publication Date |
|---|---|
| CN111456664A true CN111456664A (en) | 2020-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010302126.XA Pending CN111456664A (en) | 2020-04-16 | 2020-04-16 | Core drilling tool capable of preventing core from blocking |
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| CN (1) | CN111456664A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112282683A (en) * | 2020-11-05 | 2021-01-29 | 侯鑫凯 | Efficient drilling bit assembly for drilling |
| CN113107410A (en) * | 2021-04-14 | 2021-07-13 | 广东工业大学 | Locking device for salvaging drilling core-taking pipe and using method thereof |
-
2020
- 2020-04-16 CN CN202010302126.XA patent/CN111456664A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112282683A (en) * | 2020-11-05 | 2021-01-29 | 侯鑫凯 | Efficient drilling bit assembly for drilling |
| CN113107410A (en) * | 2021-04-14 | 2021-07-13 | 广东工业大学 | Locking device for salvaging drilling core-taking pipe and using method thereof |
| CN113107410B (en) * | 2021-04-14 | 2024-05-03 | 广东工业大学 | Locking device for core taking pipe of salvaging drilling and application method thereof |
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