CN113530452B - Retractable drill bit and drilling tool equipment for ocean drilling - Google Patents
Retractable drill bit and drilling tool equipment for ocean drilling Download PDFInfo
- Publication number
- CN113530452B CN113530452B CN202110980558.0A CN202110980558A CN113530452B CN 113530452 B CN113530452 B CN 113530452B CN 202110980558 A CN202110980558 A CN 202110980558A CN 113530452 B CN113530452 B CN 113530452B
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- drill bit
- side wall
- block
- bit matrix
- drill
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- 238000005553 drilling Methods 0.000 title claims abstract description 80
- 239000011159 matrix material Substances 0.000 claims abstract description 43
- 230000009471 action Effects 0.000 claims abstract description 10
- 230000005489 elastic deformation Effects 0.000 claims abstract description 5
- 238000009434 installation Methods 0.000 claims description 20
- 241001449342 Chlorocrambe hastata Species 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 4
- 239000011435 rock Substances 0.000 claims description 4
- 230000008602 contraction Effects 0.000 claims 2
- 230000000149 penetrating effect Effects 0.000 abstract 2
- 238000010276 construction Methods 0.000 description 18
- 238000000034 method Methods 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/02—Core bits
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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, core extractors
- E21B25/02—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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, core extractors
- E21B25/18—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors the core receiver being specially adapted for operation under water
Abstract
The application discloses a retractable drill bit and drilling tool equipment for ocean drilling, wherein the drill bit comprises a drill bit matrix, a connecting part arranged at a first end of the drill bit matrix and used for connecting a core barrel, a central hole arranged at the center of the drill bit matrix, penetrating through the drill bit matrix and capable of being communicated with the core barrel, a mounting cavity arranged on the side wall of the drill bit matrix, penetrating through the side wall of the drill bit matrix and communicated with the central hole, a shrinkage block rotatably arranged in the mounting cavity, and an elastic piece arranged in the mounting cavity and used for pushing the shrinkage block to extend out of the side wall of the drill bit matrix. When the drill bit is used, the core barrel and the drill bit are connected through the connecting part, then the drill bit and the core barrel are put into the drill rod together, the shrinkage block is extruded and retracted into the drill bit matrix, the elastic piece is in an elastic deformation state until the drill bit extends out of the end part of the drill rod, the inner wall of the drill rod does not extrude the shrinkage block any more, and the elastic piece pushes the shrinkage block to extend out of the side wall of the drill bit matrix under the action of self elastic restoring force.
Description
Technical Field
The application relates to the field of ocean drilling, in particular to a retractable drill bit and drilling tool equipment for ocean drilling.
Background
In the ocean science drilling with the purpose of drilling through the 'Mohoping plane', the daily cost exceeds hundreds of thousands of RMB due to the problems of high construction risk, long time consumption and the like in the offshore construction operation, and the operation is often carried out by adopting a rope coring drilling mode in order to improve the drilling coring efficiency in the ocean drilling. The operation characteristic of rope coring drilling is that when taking the core, it does not need to propose all drill strings in the drilling, it adopts the special fisher with wire rope, through the hole in the drill stem centre bore with the hole bottom inner tube of core to the ground, obtain the core, thus has reduced and carried down the number of times and lift the auxiliary time of drilling tool, has improved the drilling efficiency, however when the drill bit wearing and tearing are serious, still need to carry the whole set of drilling tool to the earth's surface to carry out the change of drill bit. In addition, the construction condition of the bottom drilling of the ocean is complex, and the borehole wall is unstable and is easy to cause borehole accidents such as borehole wall collapse, so that a casing is needed to be put down to maintain borehole wall stability. In order to save the operation time and improve the core drilling and casing running efficiency, it is necessary to design a retractable drill bit and auxiliary drilling tool equipment which can be used in ocean drilling, can be matched with an upper rope core drilling tool and can simultaneously realize casing drilling.
Disclosure of Invention
The present application addresses the above-described deficiencies of the prior art by providing a collapsible drill bit and drilling tool apparatus for use in marine drilling.
The technical scheme adopted for solving the technical problems is as follows: the retractable drill bit comprises a drill bit matrix, a connecting part, a central hole, an installation cavity, a shrinkage block and an elastic piece, wherein the connecting part is arranged at the first end of the drill bit matrix and used for connecting a core barrel, the central hole is arranged at the center of the drill bit matrix, penetrates through the drill bit matrix and can be communicated with the core barrel, the installation cavity is arranged on the side wall of the drill bit matrix, penetrates through the side wall of the drill bit matrix and is communicated with the central hole, the shrinkage block is rotatably arranged in the installation cavity, and the elastic piece is arranged in the installation cavity and used for pushing the shrinkage block to extend out of the side wall of the drill bit matrix.
In the retractable drill for ocean drilling according to the present application, the first end of the installation cavity is provided with a rotation shaft, and the first end of the retractable block is provided with a shaft hole rotatably connected with the rotation shaft.
In the retractable drill bit for ocean drilling, the second end of the installation cavity is provided with the limiting shaft, and the second end of the retraction block is provided with the arc limiting hole through which the limiting shaft can pass;
when the shrinkage block rotates around the rotating shaft to extend out of the side wall of the drill bit matrix, the limiting shaft abuts against the end part of the first end of the arc limiting hole.
In the retractable drill bit for ocean drilling, the elastic piece is a torsion spring sleeved on the rotating shaft, the first end of the torsion spring is elastically abutted with the first end of the retraction block, and the second end of the torsion spring is elastically abutted with the inner side wall of the installation cavity.
In the retractable drill bit for ocean drilling, a first threaded hole for the rotary shaft to be inserted and screwed is formed in the first side wall of the installation cavity, a first through hole for the rotary shaft to be inserted and pass through is formed in the second side wall of the installation cavity, a first threaded column which can be inserted into the first threaded hole and screwed with the first threaded hole is formed at the first end of the rotary shaft, and a first nut is arranged at the second end of the rotary shaft;
the first side wall of the mounting cavity is also provided with a second threaded hole for the limit shaft to be inserted into and screwed with, the second side wall of the mounting cavity is also provided with a second through hole for the rotation shaft to be inserted into and pass through, the first end of the limit shaft is provided with a second threaded column which can be inserted into the second threaded hole to be screwed with the second threaded hole, and the second end of the rotation shaft is provided with a second nut.
In the retractable drill bit for ocean drilling, the connecting part is a cylindrical connecting part, the outer side wall of the connecting part is provided with external threads which can be used for being screwed with the core barrel, and the second end face of the retractable block is welded with a plurality of PDC composite sheets.
The other technical scheme adopted by the application for solving the technical problems is as follows: the drilling tool equipment comprises the drill bit, a core barrel connected with the connecting part and communicated with the central hole, a drill rod sleeved outside the core barrel, a connecting seat fixedly arranged at the first end of the core barrel, a sleeve shoe fixedly arranged at the end part of the second end of the drill rod, and an inner ring seat fixedly arranged on the inner side wall of the outer sleeve and used for being clamped with the connecting seat.
In the drilling tool equipment for ocean drilling, the first end of the inner ring seat is provided with at least one clamping groove, and the position of the second end of the connecting seat corresponding to the clamping groove is provided with at least one clamping tooth which can be clamped into the clamping groove.
In the drilling tool equipment for ocean drilling, a spearhead is fixedly arranged in the middle of the first end of the connecting seat.
In the drilling tool device for offshore drilling according to the application, the first end of the casing shoe is fixedly connected to the end of the second end of the drill rod, the second end of the casing shoe being provided with a flare for shrinking the shrinking block.
The retractable drill bit and the drilling tool equipment for ocean drilling have the following beneficial effects: when the retractable drill bit for ocean drilling is used, the core barrel and the drill bit can be connected through the connecting part, then the drill bit and the core barrel are put into the drill rod together, the retractable block is extruded and retracted into the drill bit matrix, the elastic piece is in an elastic deformation state until the drill bit extends out of the end part of the drill rod, the inner wall of the drill rod does not extrude the retractable block any more, and the elastic piece pushes the retractable block to extend out of the side wall of the drill bit matrix under the action of self elastic restoring force, so that the effect of increasing the drilling surface of the drill bit is achieved. When the drill bit and the core barrel are required to be retrieved, the core barrel and the drill bit are pulled upwards, the shrinkage block is extruded by the end part of the drill rod and is retracted into the drill bit matrix again, so that the core barrel and the drill bit can be directly taken out along the drill rod, the step that the whole set of drilling tool is required to be lifted to an offshore drilling platform due to the abrasion of the drill bit is avoided, the construction cost is saved, the construction efficiency is improved, and technical support is provided for realizing the Chinese ocean drilling target.
Drawings
The application will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic view of the construction of a collapsible drill bit of the present application for marine drilling;
FIG. 2 is a schematic cross-sectional view of a collapsible drill bit of the present application for marine drilling;
FIG. 3 is a schematic view of the structure of the drilling device of the present application in the raised state for offshore drilling;
FIG. 4 is a schematic view of the sectional structure of the drilling tool apparatus of the present application in the raised state for offshore drilling;
FIG. 5 is a schematic view of the lowered state construction of the drilling apparatus for offshore drilling according to the present application;
fig. 6 is a schematic view showing a sectional structure of a lowered state of the drilling tool apparatus for offshore drilling according to the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, in a first embodiment of the ocean drilling collapsible drill bit of the present application, the drill bit 1 comprises a drill bit body 2, a connecting portion 3 provided at a first end of the drill bit body 2 for connecting a core barrel 16, a central hole 4 provided at a center of the drill bit body 2 through the drill bit body 2 and communicable with the core barrel 16, a mounting cavity 5 provided on a side wall of the drill bit body 2 through a side wall of the drill bit body 2 and communicable with the central hole 4, a shrinkage block 6 rotatably provided in the mounting cavity 5, and an elastic member 7 provided in the mounting cavity 5 for pushing the shrinkage block 6 to extend out of the side wall of the drill bit body 2.
When the retractable drill bit 1 for ocean drilling is used, the core barrel 16 and the drill bit 1 can be connected through the connecting part 3, then the drill bit 1 and the core barrel 16 are put into the drill stem 17 together, the retractable block 6 is extruded and retracted into the drill bit matrix 2, the elastic piece 7 is in an elastic deformation state until the drill bit 1 extends out of the end part of the drill stem 17, the inner wall of the drill stem 17 does not extrude the retractable block 6 any more, and the elastic piece 7 pushes the retractable block 6 to extend out of the side wall of the drill bit matrix 2 under the action of self elastic restoring force, so that the effect of increasing the drilling surface of the drill bit 1 is achieved. When the drill bit 1 and the core barrel 16 are required to be retrieved, the core barrel 16 and the drill bit 1 are pulled upwards, the shrinkage block 6 is extruded by the end part of the drill rod 17 and is retracted into the drill bit matrix 2 again, so that the core barrel 16 and the drill bit 1 can be directly taken out along the drill rod 17, the step that the whole set of drilling tool is required to be lifted to an offshore drilling platform due to abrasion of the drill bit 1 is avoided, the construction and maintenance time is saved, the construction cost is saved, and the construction efficiency is improved.
In this embodiment, the first end of the installation cavity 5 is provided with a rotation shaft 8, and the first end of the shrinkage block 6 is provided with a shaft hole 9 rotatably connected with the rotation shaft 8.
When the shrinkage block 6 is installed in the installation cavity 5, the rotation shaft 8 passes through the shaft hole 9, so that the shrinkage block 6 can rotate around the rotation shaft 8, which will be described in detail below.
Further, a limiting shaft 10 is disposed at the second end of the mounting cavity 5, and an arc limiting hole 11 through which the limiting shaft 10 can pass is disposed at the second end of the shrinkage block 6. When the shrinkage block 6 rotates around the rotation shaft 8 to extend out of the side wall of the drill bit matrix 2, the limiting shaft 10 abuts against the first end of the arc limiting hole 11.
The arc-shaped limiting holes 11 limit the rotation of the shrinkage block 6 to an angle extending out of the bit body 2 and limit the rotation of the shrinkage block 6 to an angle retracting into the bit body 2 when the shrinkage block 6 rotates around the rotation shaft 8. Preferably, the arc-shaped limiting hole 11 is a strip-shaped arc-shaped limiting hole 11, and the width of the arc-shaped limiting hole 11 is slightly larger than the diameter of the limiting shaft 10. Specifically, the center of the shaft hole 9 is the center of the arc limiting hole 11.
Specifically, the elastic member 7 is a torsion spring sleeved on the rotating shaft 8, the first end of the torsion spring is elastically abutted against the first end of the shrinkage block 6, and the second end of the torsion spring is elastically abutted against the inner side wall of the installation cavity 5.
In the initial state, the torsion spring pushes the shrinkage block 6 outwards under the action of self elastic restoring force, and the shrinkage block 6 stretches outwards under the elastic action of the torsion spring until the limiting shaft 10 is abutted with the first end of the arc limiting hole 11, so that the shrinkage block 6 is limited to stretch outwards continuously.
In this embodiment, a first threaded hole into which the rotation shaft 8 is inserted and screwed is provided on a first side wall of the installation cavity 5, a first through hole 12 into which the rotation shaft 8 is inserted and penetrates is provided on a second side wall of the installation cavity 5, a first threaded column into which the rotation shaft 8 is inserted and screwed is provided at a first end of the rotation shaft 8, and a first nut is provided at a second end of the rotation shaft 8.
Similarly, the first side wall of the installation cavity 5 is further provided with a second threaded hole for the insertion and threaded connection of the limiting shaft 10, the second side wall of the installation cavity 5 is further provided with a second through hole 13 for the insertion and the threaded connection of the rotating shaft 8, the first end of the limiting shaft 10 is provided with a second threaded column which can be inserted into the second threaded hole and is in threaded connection with the second threaded hole, and the second end of the rotating shaft 8 is provided with a second nut.
When the shrinkage block 6 is installed, the shrinkage block 6 is placed in the installation cavity 5, the first through hole 12, the shaft hole 9 and the first threaded hole are aligned, the second through hole 13, the arc limiting hole 11 and the second threaded hole are aligned, the rotating shaft 8 sequentially penetrates through the first through hole 12 and the shaft hole 9 and then is inserted into the first threaded hole to be in threaded connection with the first threaded hole, and the fixation of the rotating shaft 8 and the rotating connection of the rotating shaft 8 and the shrinkage block 6 can be achieved. And then, the limiting shaft 10 sequentially passes through the second through hole 13 and the arc limiting hole 11 and then is inserted into the second threaded hole to be in threaded connection with the second threaded hole, so that the fixing of the limiting shaft 10 and the limiting of the rotation angle of the shrinkage block 6 can be realized.
In order to facilitate the connection of the connecting part 3 and the core tube 16, the connecting part 3 is a cylindrical connecting part 3, an external thread for being screwed with the core tube 16 is arranged on the outer side wall of the connecting part 3, and a plurality of PDC composite sheets 14 are welded on the second end face of the shrinkage block 6. The action of increasing the hardness and the wear resistance of the shrinkage block 6 is achieved by welding a plurality of PDC composite sheets 14 on the second end surface of the shrinkage block 6.
In the present embodiment, the bit body 2 is a cylindrical bit body 2.
As shown in fig. 3 to 6, in a first embodiment of the drilling tool apparatus for offshore drilling according to the present application, the drilling tool apparatus 15 comprises the drill bit 1, the core barrel 16 connected to the connection part 3 and communicating with the central hole 4, the drill rod 17 sleeved outside the core barrel 16, the connection seat 18 fixedly arranged at the first end of the core barrel 16, the sleeve shoe 19 fixedly arranged at the second end of the drill rod 17, and the inner ring seat 20 fixedly arranged on the inner side wall of the outer sleeve and capable of being used for being clamped with the connection seat 18.
According to the application, the drill rod is used for replacing the traditional casing, so that the casing running construction procedure in ocean drilling is simplified, and the casing running time is saved.
When the drilling tool equipment 15 for ocean drilling is used, the second end of the core barrel 16 is connected with the drill bit 1 through the connecting part 3, the connecting seat 18 is connected with the first end of the core barrel 16, then the drill bit 1, the core barrel 16 and the connecting seat 18 are put into the drill stem 17 together through ropes, the shrinkage block 6 is extruded and retracted into the drill bit matrix 2, the elastic piece 7 is in an elastic deformation state until the drill bit 1 extends out of the sleeve shoe 19 at the second end of the drill stem 17, the drill stem 17 and the inner wall of the sleeve shoe 19 do not extrude the shrinkage block 6 any more, and the elastic piece 7 pushes the shrinkage block 6 to extend out of the side wall of the drill bit matrix 2 under the action of self elastic restoring force, so that the effect of increasing the drilling surface of the drill bit 1 is achieved. When the drill bit 1 and the core barrel 16 are required to be retrieved, the core barrel 16 and the drill bit 1 are pulled upwards, the shrinkage block 6 is extruded by the sleeve shoe 19 and is retracted into the drill bit matrix 2 again, so that the core barrel 16 and the drill bit 1 can be directly taken out along the drill rod 17, the step that the whole set of drilling tool is required to be lifted to an offshore drilling platform due to abrasion of the drill bit 1 is avoided, the construction and maintenance time is saved, the construction cost is saved, and the construction efficiency is improved.
Meanwhile, in the process of drilling the drill bit 1, rock scraps gradually enter the core barrel 16 from the central hole 4, and in the process of pulling up the core barrel 16 and the drill bit 1, the shrinkage block 6 is extruded by the sleeve shoe 19 to retract into the drill bit matrix 2 and clamp the rock cores in the central hole 4, so that the rock cores are prevented from being separated from the core barrel 16.
Further, the first end of the inner ring seat 20 is provided with at least one clamping groove 21, and the second end of the connecting seat 18 is provided with at least one clamping tooth 22 which can be clamped into the clamping groove 21 at a position corresponding to the clamping groove 21. When the connecting seat 18 contacts with the inner ring from the lower part, the latch 22 can be clamped into the clamping groove 21, so that the inner ring seat 20 and the connecting seat 18 are clamped tightly, the drill bit 1 and the drill rod 17 can be fixedly connected, and the drill bit 1 and the drill rod 17 are prevented from rotating mutually.
In order to facilitate the downward and lifting of the connection seat 18 and the drill bit 1, a spearhead 23 is fixedly arranged in the middle of the first end of the connection seat 18. Preferably, the spearhead 23 is provided with a wire slot or hole for the connection of a hanging rope.
Preferably, the first end of the sleeve shoe 19 is fixedly connected to the second end of the drill rod 17, the second end of the sleeve shoe 19 being provided with a flare 24 for collapsing the retraction block 6. When the drill bit 1 is lifted, the shrinkage block 6 is firstly contacted with the flare 24, and the shrinkage block 6 is retracted into the drill rod 17 under the extrusion of the flare 24, so that the shrinkage block 6 is prevented from clamping the sleeve shoe 19, and the drill bit 1 cannot be lifted.
After the retractable drill bit 1 and the matched drilling tool equipment 15 are assembled, the retractable drill bit 1 is lowered to the bottom of the hole along the inner wall of the drill rod 17 through a fishing mechanism of the rope core drill. When the retractable drill bit 1 is lowered, the elastic piece 7 in the drill bit matrix 2 is under the action of the inner wall of the drill rod, so that the retractable block 6 is retracted into the drill bit matrix 2 and slides down along the inner wall of the drill rod 17. When the drill bit 1 is lowered to a predetermined hole depth, the bottom of the spearhead 23 just sits on the clamping groove 21 of the inner ring seat 20, and at this time, the shrinkage blocks 6 around the drill bit matrix 2 are ejected from the installation cavity 5 of the drill bit matrix 2 under the action of the elastic piece 7. When the drill rod 17 rotates, the upper inner ring seat 20 drives the inner drilling tool to rotate together, so that the functions of reaming and continuous drilling are achieved, and the state is shown in fig. 6; when the retractable drill bit 1 needs to be lifted, the rope core drilling tool can be directly lifted through the steel wire rope, at the moment, the shrinkage block 6 of the drill bit 1 is retracted inwards, and the inner side of the shrinkage block 6 wedges into the core and blocks the core, as shown in a state of fig. 4.
Overall, the application has the following beneficial effects: the drill rod is used for replacing the traditional casing, so that the casing running construction procedure in ocean drilling is simplified, and the casing running time is saved; meanwhile, the inside is drilled and cored in a rope coring mode, and the telescopic drill bit 1 is lifted and lowered along with an inner rope coring drill bit, so that the step that the whole set of drill bit needs to be lifted to an offshore drilling platform due to drill bit abrasion is avoided, the construction and maintenance time is saved, the construction cost is saved, and the construction efficiency is improved.
In addition, in the present application, unless explicitly specified and limited otherwise, the terms "connected," "stacked," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
The foregoing description is only illustrative of the present application and is not intended to limit the scope of the application, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present application.
Claims (2)
1. The retractable drill bit for ocean drilling is characterized by comprising a drill bit matrix, a connecting part, a central hole, a mounting cavity, a shrinkage block and an elastic piece, wherein the connecting part is arranged at the first end of the drill bit matrix and used for connecting a core barrel, the central hole is arranged at the center of the drill bit matrix, penetrates through the drill bit matrix and can be communicated with the core barrel, the mounting cavity is arranged on the side wall of the drill bit matrix, penetrates through the side wall of the drill bit matrix and is communicated with the central hole, the shrinkage block is rotatably arranged in the mounting cavity, and the elastic piece is arranged in the mounting cavity and used for pushing the shrinkage block to extend out of the side wall of the drill bit matrix;
the first end of the mounting cavity is provided with a rotating shaft, and the first end of the contraction block is provided with a shaft hole which can be rotationally connected with the rotating shaft;
a limiting shaft is arranged at the second end of the mounting cavity, and an arc limiting hole through which the limiting shaft can pass is arranged at the second end of the contraction block; when the shrinkage block rotates around the rotating shaft to extend out of the side wall of the drill bit matrix, the limiting shaft abuts against the end part of the first end of the arc limiting hole;
the elastic piece is a torsion spring sleeved on the rotating shaft, the first end of the torsion spring is elastically abutted with the first end of the shrinkage block, and the second end of the torsion spring is elastically abutted with the inner side wall of the mounting cavity;
the first side wall of the installation cavity is provided with a first threaded hole for the rotating shaft to be inserted and screwed, the second side wall of the installation cavity is provided with a first through hole for the rotating shaft to be inserted and pass through, the first end of the rotating shaft is provided with a first threaded column which can be inserted into the first threaded hole and is screwed with the first threaded hole, and the second end of the rotating shaft is provided with a first nut;
the first side wall of the mounting cavity is also provided with a second threaded hole for the limit shaft to be inserted and screwed, the second side wall of the mounting cavity is also provided with a second through hole for the rotation shaft to be inserted and pass through, the first end of the limit shaft is provided with a second threaded column which can be inserted into the second threaded hole and is screwed with the second threaded hole, and the second end of the rotation shaft is provided with a second nut;
the connecting part is a cylindrical connecting part, an external thread which can be used for being in threaded connection with the rock core pipe is arranged on the outer side wall of the connecting part, and a plurality of PDC composite sheets are welded on the end face of the second end of the shrinkage block in an embedded manner;
when the retractable drill bit is used, the core barrel and the drill bit are connected through the connecting part, then the drill bit and the core barrel are put into a drill rod together, the retraction block is extruded and retracted into the drill bit matrix, the elastic piece is in an elastic deformation state until the drill bit extends out of the end part of the drill rod, the inner wall of the drill rod does not extrude the retraction block any more, and the elastic piece pushes the retraction block to extend out of the side wall of the drill bit matrix under the action of self elastic restoring force; and when the drill bit and the core barrel need to be retrieved, the core barrel and the drill bit are pulled upwards, the shrinkage block is extruded by the end part of the drill rod and is retracted into the drill bit matrix again, and therefore the core barrel and the drill bit are taken out directly along the drill rod.
2. A drilling tool device for ocean drilling, which is characterized by comprising the retractable drill bit, a core tube connected with the connecting part and communicated with the central hole, a drill rod sleeved outside the core tube, a connecting seat fixedly arranged at the first end of the core tube, a sleeve shoe fixedly arranged at the second end of the drill rod, and an inner ring seat fixedly arranged on the inner side wall of the outer sleeve and used for being clamped with the connecting seat; the first end of the inner ring seat is provided with at least one clamping groove, and the position of the second end of the connecting seat corresponding to the clamping groove is provided with at least one clamping tooth which can be clamped into the clamping groove; a spearhead is fixedly arranged in the middle of the first end of the connecting seat; the first end of the sleeve shoe is fixedly connected with the end part of the second end of the drill rod, and the second end of the sleeve shoe is provided with a horn mouth for shrinking the shrinking block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110980558.0A CN113530452B (en) | 2021-08-25 | 2021-08-25 | Retractable drill bit and drilling tool equipment for ocean drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110980558.0A CN113530452B (en) | 2021-08-25 | 2021-08-25 | Retractable drill bit and drilling tool equipment for ocean drilling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113530452A CN113530452A (en) | 2021-10-22 |
| CN113530452B true CN113530452B (en) | 2023-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110980558.0A Active CN113530452B (en) | 2021-08-25 | 2021-08-25 | Retractable drill bit and drilling tool equipment for ocean drilling |
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| CN115788325B (en) * | 2023-01-31 | 2023-05-05 | 山西地科勘察有限公司 | Coal lower aluminum ore drilling device for geological exploration of goaf |
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| CN113294107A (en) * | 2021-06-24 | 2021-08-24 | 珠海市英格尔特种钻探设备有限公司 | Spiral rope core drill and construction method thereof |
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2021
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| CN113530452A (en) | 2021-10-22 |
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Inventor after: Li Xingchen Inventor after: Li Bin Inventor after: Wang Yingsheng Inventor after: Huang Fangfei Inventor after: Xu Zhenqiang Inventor after: Xie Wenwei Inventor after: Xiong Liang Inventor after: Kou Beibei Inventor after: Lu Qiuping Inventor after: Yu Haoyu Inventor after: Zeng Jing Inventor after: Li Jing Inventor before: Li Xingchen Inventor before: Li Bin Inventor before: Wang Yingsheng Inventor before: Huang Fangfei Inventor before: Xu Zhenqiang Inventor before: Xie Wenwei Inventor before: Xiong Liang Inventor before: Kou Beibei Inventor before: Yu Qiuping Inventor before: Yu Haoyu Inventor before: Zeng Jing Inventor before: Li Jing |