CN113530453A - Core drilling tool structure with core unblocking function - Google Patents
Core drilling tool structure with core unblocking function Download PDFInfo
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- CN113530453A CN113530453A CN202111029698.6A CN202111029698A CN113530453A CN 113530453 A CN113530453 A CN 113530453A CN 202111029698 A CN202111029698 A CN 202111029698A CN 113530453 A CN113530453 A CN 113530453A
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- 238000005553 drilling Methods 0.000 title claims abstract description 75
- 230000008878 coupling Effects 0.000 claims abstract description 51
- 238000010168 coupling process Methods 0.000 claims abstract description 51
- 238000005859 coupling reaction Methods 0.000 claims abstract description 51
- 230000001360 synchronised effect Effects 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 70
- 239000011435 rock Substances 0.000 claims description 9
- 239000003433 contraceptive agent Substances 0.000 claims description 6
- 230000002254 contraceptive effect Effects 0.000 claims description 6
- 238000005299 abrasion Methods 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000007246 mechanism Effects 0.000 description 7
- 230000000903 blocking effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000003068 static effect 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
- E21B10/00—Drill bits
- E21B10/02—Core bits
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- Life Sciences & Earth Sciences (AREA)
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- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a core drilling tool structure with a core plug removal function, which comprises a core drilling tool outer assembly and a core drilling tool inner assembly; the outer assembly of the core drill comprises an upper joint, a bearing cavity, an outer pipe centralizer and a drill bit which are sequentially connected by threads; the inner assembly of the core drilling tool comprises a mandrel, a core pipe joint, a core pipe, a shunt coupling and a shunt sleeve which are sequentially connected in a threaded manner, wherein a floating clamp spring seat is arranged in the shunt sleeve, a clamp spring is arranged at one end, close to a drill bit, in the floating clamp spring seat, and one end, close to the drill bit, of the floating clamp spring seat is matched with the shunt sleeve through a spline, so that synchronous rotation can be realized; one end of the core tube close to the shunt coupling is tightly contacted with an elastic thin-walled tube provided with an axial S-shaped opening; and a spring is sleeved in an annular space between the floating clamp spring seat and the shunt sleeve. The invention can automatically realize the blockage removal or relieve the blockage degree, reduce the core abrasion in the coring drilling and improve the core taking rate and the drilling efficiency of the broken stratum which is easy to block the core.
Description
Technical Field
The invention relates to the technical field of core drilling tools in drilling engineering, in particular to a core drilling tool structure with a core blockage removing function.
Background
Core drilling is a drilling method and process aiming at obtaining formation physical data cores, and is an important component of drilling engineering. Core drilling is a vital technological method in oil and gas exploration drilling (including conventional petroleum and natural gas, shale gas, natural gas hydrate and the like), geothermal drilling, hot dry rock drilling, scientific drilling and the like. However, in the process of core drilling, a broken and easily-blocked stratum is often encountered, after a core enters a drill bit, the stress of a core column is released due to the fact that surrounding rock pressure disappears, the core column is broken into rock blocks or rock slag along a fracture, once the core is blocked at a position passing through a core clamp spring seat and a clamp spring or in a core tube, the core is prevented from continuously entering the core tube in subsequent drilling, the broken part of the core is extruded, abrasion and repeated core abrasion of the drill bit are caused, the core sampling rate is insufficient, the obtained stratum information is lost, meanwhile, the subsequent core tube entering speed is influenced due to core blocking, the core drilling speed is further influenced, and if the core is blocked, the repeated drilling is stopped, and the comprehensive drilling efficiency is seriously influenced.
At present, a conventional double-cylinder single-action coring drilling tool which is widely applied is used, a core is broken at a clamp spring seat and a clamp spring or in a core tube after entering a drill bit to form a core blocking state, generally, the drilling pressure and the rotating speed parameters can be adjusted only within a certain range, the drilling state of the drilling tool is changed to obtain a very small blockage removing effect, and the blockage removing probability is very low by the method.
Disclosure of Invention
The invention aims to provide a core drilling tool structure with a core blockage removing function, which is used for solving the problems in the prior art, can automatically remove blockage or relieve the blockage degree, reduces the core abrasion in core drilling, and improves the core taking rate and drilling efficiency of a broken stratum which is easy to block.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a core drilling tool structure with a core plug removal function, which comprises a core drilling tool outer assembly and a core drilling tool inner assembly, wherein the core drilling tool inner assembly is suspended in the core drilling tool outer assembly and is centered by a drill bit centering ring, so that the core drilling tool outer assembly can rotate, and the core drilling tool inner assembly is not moved; the outer assembly of the core drill comprises an upper joint, a bearing cavity, an outer pipe centralizer and a drill bit which are sequentially connected by threads; the core drill inner assembly comprises a mandrel arranged in the bearing cavity through a thrust bearing, the mandrel is hollow and provided with a water inlet and a mandrel water hole, one end, far away from the upper joint, of the mandrel is sequentially in threaded connection with a core pipe joint, a core pipe, a shunt coupling and a shunt sleeve, a floating clamp spring seat is arranged in the shunt sleeve, a clamp spring is arranged at one end, close to a drill bit, in the floating clamp spring seat, one end, close to the drill bit, of the floating clamp spring seat is matched with the shunt sleeve through splines, and synchronous rotation can be achieved; one end of the core tube, which is close to the shunt coupling, is tightly contacted with an elastic thin-walled tube provided with an axial S-shaped opening; the reposition of redundant personnel coupling includes first coupling, second coupling and the third coupling that the outer wall diameter reduces in proper order, first coupling with core barrel threaded connection, the second coupling with reposition of redundant personnel cover threaded connection, the third coupling is terminal to be inserted and is located in the jump ring seat floats, float the jump ring seat with the annular space endotheca between the reposition of redundant personnel cover is equipped with the spring, the spring can make the coupling water hole on the third coupling and the jump ring seat water hole dislocation on the jump ring seat that floats. According to the invention, through the design of the core-blocking prevention mechanism of the core drilling tool, after a core enters a drill bit to be crushed and blocked, the action of the core-blocking prevention mechanism of the drilling tool is used for exciting to automatically realize blockage removal or relieve the degree of the blockage, no operation is needed at a well mouth, the core drilling tool can self identify the shape of the blockage and excite the action of the core-blocking prevention mechanism to realize the blockage removal function during drilling, and the part of the core-blocking prevention mechanism recovers the recovery drilling state after the core is removed from the blockage, so that the blockage removal function can be realized again. The core blockage removing effect reduces the core abrasion in core drilling, improves the core taking rate of a broken stratum which is easy to block the core, increases the integrity of stratum information acquisition, can effectively relieve the problem of drilling speed reduction caused by core blockage, and improves the drilling efficiency.
Optionally, the external screw thread has been seted up respectively at core tube both ends, core tube one end with the terminal internal thread of core tube coupling passes through threaded connection, the core tube other end with the internal thread that drill bit one end was kept away from to the reposition of redundant personnel coupling passes through threaded connection.
Optionally, the water inlet is formed in one end of the mandrel close to the upper joint, an annular protrusion is arranged on a portion of the mandrel located between the thrust bearings, the annular protrusion is located in the bearing cavity, and one end of the mandrel far away from the upper joint penetrates through the bearing cavity and is inserted into the core pipe joint; the mandrel water hole comprises a first mandrel water hole and a second mandrel water hole, the first mandrel water holes are annularly arranged on the sidewall of the mandrel, the first mandrel water holes are located between the bearing cavity and the mandrel pipe joint, and the second mandrel water holes are arranged at one end, far away from the upper joint, of the mandrel.
Optionally, the first coupling, the second coupling and the third coupling are arranged in a stepped manner, and a plurality of coupling water holes are uniformly arranged on the side wall of the third coupling in a surrounding manner.
Optionally, the shunt sleeve includes a first shunt sleeve and a second shunt sleeve, an outer diameter of the first shunt sleeve is smaller than an outer diameter of the second shunt sleeve, and the first shunt sleeve is in threaded connection with one end of the shunt coupling; the first diversion cover is fitted with a contraceptive ring and is equipped with first diversion cover water hole, the second diversion cover is fitted with a contraceptive ring and is equipped with second diversion cover water hole, the second diversion cover is close to the inner wall of drill bit one end is fitted with a contraceptive ring and is equipped with the spline groove.
Optionally, a spline is arranged on the outer wall of one end of the floating clamp spring seat in a ring mode, a clamp spring seat water hole is arranged on the outer wall of the other end of the floating clamp spring seat in a ring mode, and the spline is connected with the spline groove in a matched mode; the inner wall of the floating clamp spring seat, which is provided with the spline end, is of a gradually inclined conical structure, and the outer wall of the clamp spring is in taper fit connection with the conical structure of the inner wall of the floating clamp spring seat; the floating clamp spring seat is characterized in that a limiting flange is annularly arranged on the inner wall of the floating clamp spring seat, the inner diameter of the position of the limiting flange is smaller than the maximum outer diameter of the clamp spring, and the limiting flange is located between the spline and the clamp spring seat water hole.
Compared with the prior art, the invention has the following technical effects:
the core drilling tool structure with the core unblocking function provided by the invention has the advantages that the anti-blocking mechanism does not generate any mechanical action, such as vibration or shock, in the normal core drilling process, the safety of the drilling tool and the original installation performance of the core are not influenced, the well mouth identification operation is not needed when the core is blocked, the anti-blocking mechanism is self-identified and excited, the unblocking effect is realized, the floating clamp spring seat ascends, the hydraulic core can be automatically recovered to the normal core drilling state after being unblocked, and especially the unblocking effect can be realized for multiple times in a broken stratum. The invention can realize double blockage removal of the rock core at the clamp spring seat, the clamp spring and in the rock core pipe, wherein the blockage removal of the rock core at the two positions uses different principles, the hydraulic blockage removal is performed by changing a flow passage at the clamp spring seat and the clamp spring, the upward blockage removal is performed by sliding in the rock core pipe, and the blockage removal mechanism is simple, strong in reliability and wide in applicability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1-1 is a schematic view of a core drill structure having a core plug removal feature according to the present invention near one end of the upper joint during normal drilling conditions;
FIG. 1-2 is a schematic view of a core drill structure having a core plug removal function according to the present invention near one end of the drill bit during a normal drilling condition;
FIG. 2 is a schematic diagram of the position of a floating jump ring seat after the core plugging of the core drill;
FIG. 3 is a schematic cross-sectional view of a core barrel;
FIG. 4 is a schematic cross-sectional view of a mandrel;
FIG. 5 is a schematic view of a flexible thin walled tube;
FIG. 5-1 is a schematic cross-sectional view of an elastic thin-walled tube;
FIG. 6 is a schematic view of a diverter collar;
FIG. 7 is a schematic view of a shunt sleeve;
FIG. 7-1 is a cross-sectional view taken along line A-A of the shunt sleeve;
FIG. 7-2 is a cross-sectional view of the shunt sleeve taken along line B-B;
FIG. 8 is a schematic view of a floating clamp spring seat;
FIG. 8-1 is a sectional view of the floating clamp spring seat along the direction A-A;
FIG. 8-2 is a sectional view of the floating clamp spring seat along the direction B-B;
wherein, 1 is an upper joint; 2 is a bearing cavity; 3 is an outer tube; 4 is an outer tube centralizer; 5 is a drill bit; 6 is a mandrel; 6-1 is a first mandrel water hole; 6-2 is a second mandrel water hole; 6-3 is a water inlet; 7 is a thrust bearing; 8 is a core pipe joint; 9 is a core tube; 10 is an elastic thin-wall tube; 11 is a shunting collar; 11-1 is a coupling water hole; 11-2 is a first coupling; 11-3 is a second coupling; 11-4 is a third coupling; 12 is a flow dividing sleeve; 12-1 is a first shunt casing water hole; 12-2 is a second shunt casing water hole; 12-3 is a spline groove; 12-4 is a first shunt sleeve; 12-5 is a second shunt sleeve; 13 is a floating clamp spring seat; 13-1 is a jump ring seat water hole; 13-2 is a spline; 13-3 is a limit flange; 14 is a drill bit centralizing ring; 15 is a spring; 16 is a clamp spring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a core drilling tool structure with a core blockage removing function, which is used for solving the problems in the prior art, can automatically remove blockage or relieve the blockage degree, reduces the core abrasion in core drilling, and improves the core taking rate and drilling efficiency of a broken stratum which is easy to block.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to the attached drawings 1-1, 1-2 and 2-8, the invention provides a core drilling tool structure with a core plug removal function, wherein an upper joint 1, a bearing cavity 2, an outer pipe 3, an outer pipe centralizer 4 and a drill bit 5 are sequentially connected in a threaded manner to form an outer assembly of the core drilling tool. Wherein the 6 mandrel is supported by the 7 thrust bearing and is hung in the inner cavity of the bearing cavity 2; 6, sequentially connecting a mandrel, a core tube joint 8, a core tube 9, a shunt coupling 11 and a shunt sleeve 12 in a threaded manner; as shown in fig. 5-1, the elastic thin-walled tube 10 is uniformly provided with "S" shaped openings in the axial direction, the outer diameter of the elastic thin-walled tube is compressed and then supported at one end close to the drill bit in the sliding groove of the inner wall of the core barrel 9 by means of elastic deformation force, and the elastic thin-walled tube 10 can slide upwards along the sliding groove of the inner wall of the core barrel 9; the floating clamp spring seat 13 is hung in the inner cavity of the flow dividing sleeve 12, and a spline 13-2 at one end close to the drill bit is matched with a spline groove 12-3 to realize synchronous rotation, so that the inner assembly of the core drill is formed. The inner assembly is suspended in the outer assembly and is centered by the drill bit centering ring 14, so that the rotation inner assembly of the outer assembly of the double-pipe core drill is fixed. The shunting collar 11 comprises a first collar 11-2, a second collar 11-3 and a third collar 11-4, the diameters of the outer walls of the first collar 11-2, the second collar 11-3 and the third collar 11-4 are sequentially reduced, a plurality of collar water holes 11-1 are uniformly arranged on the side wall of the first collar 11-2 in a surrounding mode, the first collar 11-2 is in threaded connection with the core barrel, the second collar 11-3 is in threaded connection with the shunting sleeve 12, the tail end of the third collar 11-4 is inserted into the floating jump ring seat 13, a spring 15 is sleeved in an annular space between the floating jump ring seat 13 and the shunting sleeve 12, one end of the spring 15 is abutted against the spline 13-2, the other end of the spring 15 is abutted against a stepped surface between the third collar 11-4 and the second collar 11-3, and the spring 15 can enable the collar water holes 11-1 on the third collar 11-4 to be abutted against the floating jump ring seat water holes 13 on the floating jump ring seat 13 And (4) shifting the joint water hole 11-1 and the clamp spring seat water hole 13-1 under the support of spring force, and closing the flow passage.
The external screw thread has been seted up respectively at core tube 9 both ends, and threaded connection is passed through with the terminal internal thread of core tube 8 to core tube 9 one end, and threaded connection is passed through with the internal thread that shunts coupling 11 and keep away from 5 one ends of drill bit to the core tube 9 other end. One end of the mandrel 6, which is close to the upper joint 1, is provided with a water inlet 6-3, the part of the mandrel 6, which is positioned between the thrust bearings 7, is provided with an annular bulge, the annular bulge is positioned in the bearing cavity 2, and one end of the mandrel 6, which is far away from the upper joint 1, penetrates through the bearing cavity 2 and is inserted into the core barrel joint 8; the mandrel water holes comprise first mandrel water holes 6-1 and second mandrel water holes 6-2, the first mandrel water holes 6-1 are arranged on the side wall of the mandrel 6 in a surrounding mode, the first mandrel water holes 6-1 are located between the bearing cavity 2 and the mandrel pipe joint 8, and the second mandrel water holes 6-2 are arranged at one end, far away from the upper joint 1, of the mandrel 6. As shown in fig. 7, 7-1 and 7-2, the flow dividing sleeve 12 comprises a first flow dividing sleeve 12-4 and a second flow dividing sleeve 12-5, the outer diameter of the first flow dividing sleeve 12-4 is smaller than that of the second flow dividing sleeve 12-5, and the first flow dividing sleeve 12-4 is in threaded connection with one end of the flow dividing collar 11; the first diversion sleeve 12-4 is provided with a first diversion sleeve water hole 12-1 in a surrounding mode, the second diversion sleeve 12-5 is provided with a second diversion sleeve water hole 12-2 in a surrounding mode, and the inner wall of one end, close to the drill bit 5, of the second diversion sleeve 12-5 is provided with a spline groove 12-3 in a surrounding mode. As shown in fig. 8, 8-1 and 8-2, a spline 13-2 is arranged on the outer wall of one end of the floating clamp spring seat 13 in a ring mode, a clamp spring seat water hole 13-1 is arranged on the outer wall of the other end of the floating clamp spring seat 13 in a ring mode, and the spline 13-2 is connected with a spline groove 12-3 in a matched mode; the inner wall of the floating clamp spring seat 13, which is provided with the spline 13-2, is of a gradually inclined conical structure, and the outer wall of the clamp spring 16 is in taper fit connection with the conical structure of the inner wall of the floating clamp spring seat 13; and a limiting flange 13-3 is annularly arranged on the inner wall of the floating clamp spring seat 13, the inner diameter of the position of the limiting flange 13-3 is smaller than the maximum outer diameter of the clamp spring 16, and the limiting flange 13-3 is positioned between the spline 13-2 and the clamp spring seat water hole 13-1.
When the core drilling machine works, firstly, core drilling is started, drilling fluid enters from a central water hole of the drilling tool and is shunted through a first water hole 6-1 and a second water hole 6-2 of the mandrel 6, most of the drilling fluid flows into an annular space between the inner assembly and the outer assembly from the first water hole 6-1, and only a small amount of the drilling fluid flows into a core pipe from the second water hole 6-2 to lubricate and clean the inner wall of the core pipe. When the drilling fluid flowing into the annular space flows through the diversion sleeve 12, the drilling fluid flows into the first diversion sleeve port 12-1, flows out of the second diversion sleeve port 12-2 and flows to the drill bit 5. When the core enters the drill bit 5, the floating clamp spring seat 13 and the clamp spring 16, the core can smoothly enter the core tube and go upward, and the drilling tool is in the state shown in figures 1-1 and 1-2. If the stress of the core entering the drill bit is released or the core is cracked along the crack and then forms a core blocking state at the jump ring seat and the jump ring, the cracked core is extruded and dislocated with each other, the friction force between the cracked core and the inner walls of the jump ring and the jump ring seat is increased sharply, when the friction force formed by core blocking is increased to a certain value, the floating jump ring seat 13 is pushed to compress the spring 15 to move upwards until the end part of the floating jump ring seat 13 is contacted and limited with the end surface of a second shunt coupling of a shunt coupling 11, at the time, a superposed runner of the coupling water eye 11-1 and the jump ring seat water eye 13-1 is opened, simultaneously, a spline 13-2 at the lower part of the floating jump ring seat 13 after the floating jump ring seat 13 moves upwards seals the second shunt sleeve water eye 12-2 at the lower end of the shunt sleeve 12, and the drilling fluid flowing into the first shunt sleeve water eye 12-1 can all flow into the inner part of the floating jump ring seat 13 and the jump ring 16 through the coupling water eye 11-1 and the jump ring seat water eye 13-1, a large amount of drilling fluid can strongly flush and clean core debris blocked at the floating clamp spring seat 13 and the clamp spring 16, after the core is unblocked, the friction force between the core and the clamp spring 16 and the inner wall of the floating clamp spring seat 13 is reduced or disappears, at the moment, the floating clamp spring seat 13 downwards closes a water eye flow passage of the coupling water eye 11-1 and the clamp spring seat water eye 13-1 under the action of spring force, meanwhile, the spline 13-2 downwards opens a second shunt sleeve water eye 12-2 along a spline groove 12-3 at the lower end of the shunt sleeve 12, and the drilling fluid restores the flow passage state before the core is blocked. If the core forms a core blocking shape after entering the core tube, the friction force between the extruded and dislocated core and the inner wall of the elastic thin-walled tube 10 is increased, and when the friction force is increased to a certain value, the elastic thin-walled tube 10 is pushed to move upwards along the sliding groove of the inner wall of the core tube 9, so that the core is prevented from further extruding, deforming, dislocating or even blocking, and the subsequent core is ensured to normally enter the tube and move upwards; meanwhile, the cracked core entering the elastic thin-walled tube 10 keeps static relative to the elastic thin-walled tube 10 in the ascending process, so that the original shape cannot be continuously damaged, and the accuracy of acquiring formation data is improved.
In the description of the present invention, it should be noted that the terms "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. The utility model provides a coring drilling tool structure with stifled function is separated to rock core which characterized in that: the core drill inner assembly is suspended in the core drill outer assembly and is centered by a drill centering ring, so that the core drill outer assembly can rotate, and the core drill inner assembly is not moved; the outer assembly of the core drill comprises an upper joint, a bearing cavity, an outer pipe centralizer and a drill bit which are sequentially connected by threads; the core drill inner assembly comprises a mandrel arranged in the bearing cavity through a thrust bearing, the mandrel is hollow and provided with a water inlet and a mandrel water hole, one end, far away from the upper joint, of the mandrel is sequentially in threaded connection with a core pipe joint, a core pipe, a shunt coupling and a shunt sleeve, a floating clamp spring seat is arranged in the shunt sleeve, a clamp spring is arranged at one end, close to a drill bit, in the floating clamp spring seat, one end, close to the drill bit, of the floating clamp spring seat is matched with the shunt sleeve through splines, and synchronous rotation can be achieved; one end of the core tube, which is close to the shunt coupling, is tightly contacted with an elastic thin-walled tube provided with an axial S-shaped opening; the reposition of redundant personnel coupling includes first coupling, second coupling and the third coupling that the outer wall diameter reduces in proper order, first coupling with core barrel threaded connection, the second coupling with reposition of redundant personnel cover threaded connection, the third coupling is terminal to be inserted and is located in the jump ring seat floats, float the jump ring seat with the annular space endotheca between the reposition of redundant personnel cover is equipped with the spring, the spring can make the coupling water hole on the third coupling and the jump ring seat water hole dislocation on the jump ring seat that floats.
2. The core drilling tool structure with core unblocking function according to claim 1, wherein: the external screw thread has been seted up respectively at core tube both ends, core tube one end with the terminal internal thread of core tube coupling passes through threaded connection, the core tube other end with the internal thread that the drill bit one end was kept away from to the reposition of redundant personnel coupling passes through threaded connection.
3. The core drilling tool structure with core unblocking function according to claim 1, wherein: the water inlet is formed in one end, close to the upper connector, of the mandrel, an annular bulge is arranged on the portion, located between the thrust bearings, of the mandrel, the annular bulge is located in the bearing cavity, and one end, far away from the upper connector, of the mandrel penetrates through the bearing cavity and is inserted into the core pipe connector; the mandrel water hole comprises a first mandrel water hole and a second mandrel water hole, the first mandrel water holes are annularly arranged on the sidewall of the mandrel, the first mandrel water holes are located between the bearing cavity and the mandrel pipe joint, and the second mandrel water holes are arranged at one end, far away from the upper joint, of the mandrel.
4. The core drilling tool structure with core unblocking function according to claim 1, wherein: the first coupling, the second coupling and the third coupling are arranged in a stepped mode, and a plurality of coupling water holes are uniformly arranged on the side wall of the third coupling in a surrounding mode.
5. The core drilling tool structure with core unblocking function according to claim 1, wherein: the shunt sleeve comprises a first shunt sleeve and a second shunt sleeve, the outer diameter of the first shunt sleeve is smaller than that of the second shunt sleeve, and the first shunt sleeve is in threaded connection with one end of the shunt coupling; the first diversion cover is fitted with a contraceptive ring and is equipped with first diversion cover water hole, the second diversion cover is fitted with a contraceptive ring and is equipped with second diversion cover water hole, the second diversion cover is close to the inner wall of drill bit one end is fitted with a contraceptive ring and is equipped with the spline groove.
6. The core drilling tool structure with core unblocking function according to claim 5, characterized in that: the outer wall of one end of the floating clamp spring seat is provided with a spline in a ring mode, the outer wall of the other end of the floating clamp spring seat is provided with a clamp spring seat water hole in a ring mode, and the spline is connected with the spline groove in a matched mode; the inner wall of the floating clamp spring seat, which is provided with the spline end, is of a gradually inclined conical structure, and the outer wall of the clamp spring is in taper fit connection with the conical structure of the inner wall of the floating clamp spring seat; the floating clamp spring seat is characterized in that a limiting flange is annularly arranged on the inner wall of the floating clamp spring seat, the inner diameter of the position of the limiting flange is smaller than the maximum outer diameter of the clamp spring, and the limiting flange is located between the spline and the clamp spring seat water hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111029698.6A CN113530453A (en) | 2021-09-03 | 2021-09-03 | Core drilling tool structure with core unblocking function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111029698.6A CN113530453A (en) | 2021-09-03 | 2021-09-03 | Core drilling tool structure with core unblocking function |
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| CN113530453A true CN113530453A (en) | 2021-10-22 |
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| CN202111029698.6A Pending CN113530453A (en) | 2021-09-03 | 2021-09-03 | Core drilling tool structure with core unblocking function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115876516A (en) * | 2022-07-12 | 2023-03-31 | 平顶山天安煤业股份有限公司 | Self-cleaning pressure maintaining coring equipment and use method thereof |
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