CN113153162A - Non-pitching free telescopic type reamer while drilling - Google Patents
Non-pitching free telescopic type reamer while drilling Download PDFInfo
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- CN113153162A CN113153162A CN202110469770.0A CN202110469770A CN113153162A CN 113153162 A CN113153162 A CN 113153162A CN 202110469770 A CN202110469770 A CN 202110469770A CN 113153162 A CN113153162 A CN 113153162A
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- 238000005553 drilling Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- 230000007246 mechanism Effects 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 description 14
- 230000008602 contraction Effects 0.000 description 4
- 229910003460 diamond Inorganic materials 0.000 description 3
- 239000010432 diamond Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000010339 dilation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000036346 tooth eruption 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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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
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
- E21B10/322—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools cutter shifted by fluid pressure
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
Abstract
The invention discloses a non-pitching free telescopic type reamer while drilling, which comprises a reamer body, wherein a movable cavity is arranged in the reamer body; the outer surface of the reaming body is provided with a reaming opening; the eye-expanding opening is communicated with the movable cavity; one end of the movable cavity is formed into an inlet end, and the other end of the movable cavity is formed into an outlet end; the piston is arranged in the movable cavity and can move close to or far away from the inlet end along the axial direction; the piston is connected with a blade; the blade is used for approaching or separating from the reaming opening when the piston moves close to or far from the inlet end along the axial direction, and the blade is used for extending out of the reaming opening after the piston moves close to the reaming opening; and the driving assembly is used for driving the piston to move along the axial direction. The non-pitching free telescopic reamer while drilling can drive the blade to expand and retract through the reciprocating motion of the piston, and can expand for multiple times.
Description
Technical Field
The invention relates to the technical field of drill bit equipment, in particular to a non-pitching free telescopic type reamer while drilling.
Background
The reamer is also called an expander reaming bit. Is a tool for reaming a hole while drilling in an oil well. It is different from the reaming bit installed at the lower part of the drill string, but is installed at the middle part of the drill string, and the diameter of the reaming bit is slightly larger than that of the drill bit. When the lower drill bit drills, the upper hole expander simultaneously expands the hole and repairs the well wall.
Reamers are commonly used to drill deviated, easily reduced formations. When a diamond drill bit is used for drilling, two to three diamond hole openers must be arranged in a drill string at intervals in order to prevent the drill bit from being reduced in diameter due to abrasion and ensure that a new drill bit can be smoothly put into the bottom of a well.
The existing reamer for realizing blade expansion by means of hydraulic pressure in drilling is generally realized by changing a flow channel by means of inner cavity ball throwing, but secondary expansion cannot be realized after expansion is finished.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a non-pitching free telescopic type reamer while drilling, which can drive the blades to expand and retract through the reciprocating motion of a piston and can expand for multiple times.
The purpose of the invention is realized by adopting the following technical scheme:
a non-pitching free telescopic type reamer while drilling, which comprises,
the reaming body is internally provided with a movable cavity; the outer surface of the reaming body is provided with a reaming opening; the eye-expanding opening is communicated with the movable cavity; one end of the movable cavity is formed into an inlet end, and the other end of the movable cavity is formed into an outlet end;
the piston is arranged in the movable cavity and can move close to or far away from the inlet end along the axial direction; the piston is connected with a blade; the blade is used for extending out of the reaming opening after the piston moves close to the reaming opening when the piston moves close to or far away from the inlet end along the axial direction;
and the driving assembly is used for driving the piston to move along the axial direction.
Further, the driving assembly comprises a control sleeve and a valve core,
the control sleeve is connected in the movable cavity in a penetrating manner; the control sleeve is provided with a first guide hole and a second guide hole which are distributed at intervals in the axial direction of the valve core; the first guide holes and the second guide holes are distributed in a staggered mode in the circumferential direction;
a third guide hole is formed in the piston, one end of the piston is connected with the blade, a first driving surface and a second driving surface are arranged at the other end of the piston, the first driving surface is located on one side close to the inlet end, and the second driving surface is located on one side far away from the inlet end; the first guide hole penetrates through the second driving surface to one side far away from the inlet end; the third guide hole penetrates through the first driving surface to one side close to the inlet end;
the valve core is connected to the control sleeve in a penetrating way and is matched with the control sleeve in a pivoting way; a flow guide channel is arranged in the valve core; a first flow guide hole and a second flow guide hole are formed in the side wall of the valve core; the first flow guide holes and the second flow guide holes are distributed at intervals in the axial direction of the valve core; the first guide hole is used for communicating with the first guide hole in the rotation process of the valve core so as to guide the fluid in the guide channel to flow to the second driving surface through the first guide hole and the first guide hole; the second guide hole is used for being communicated with the second guide hole in the rotating process of the valve core so as to guide the fluid in the guide channel to flow to the first driving surface through the second guide hole, the second guide hole and the third guide hole.
Further, the drive assembly further comprises a guide mechanism for guiding the rotation of the spool.
Further, the guide mechanism comprises a guide piece, a guide groove and a guide column, wherein the guide piece is arranged at the end part of the valve core at the outlet end; the end part of the guide piece close to the inlet end is formed into a jacking end; the other end of the guide piece is provided with the guide groove; the guide groove comprises a first groove section and a second groove section, and the first groove section extends in the axial direction of the valve core along a first inclined direction; the second groove section extends along a second inclined direction in the axial direction of the valve core; the first groove section is communicated with the second groove; the first inclination direction is opposite to the second inclination direction; the guide column is connected to the inner wall of the movable cavity; the guide post is movably connected in the guide groove in a penetrating manner.
Furthermore, the first groove section and the second groove section are provided with a plurality of grooves; the first groove sections are distributed at intervals in the circumferential direction of the valve core; two adjacent first groove sections are connected and communicated through the second groove section.
Furthermore, a limiting step is arranged on the inner wall of the outlet end of the movable cavity, and a first elastic component is clamped between the side face, close to the inlet end, of the limiting step and the jacking end.
Furthermore, the jacking end is provided with a jacking head, a second elastic component is clamped between the jacking head and the end part of the guide piece, and the elastic coefficient of the second elastic component is greater than that of the first elastic component.
Furthermore, a pawl is arranged on the inner wall, far away from the outlet end, of the guide piece and abuts against the side face, far away from the inlet end, of the limiting step.
Further, a nozzle is arranged on the reaming body, a pressure relief hole is formed in the piston, and the pressure relief hole is used for communicating the cutter blade with the nozzle after the cutter blade extends out of the reaming opening.
Furthermore, the inner wall of the inlet end of the movable cavity is provided with a guide inclined plane, the guide inclined plane is connected with the reaming opening, and the guide inclined plane is used for guiding the blades to move to the reaming opening when the piston moves close to the reaming opening.
Compared with the prior art, the invention has the beneficial effects that: when the reamer is expanded, the driving assembly can drive the piston to move close to the inlet end, so that the blades on the piston extend out of the reaming opening, and the extended blades can enable the drill bit to smoothly go into the well bottom. And when the drill bit normally works, the drive assembly can drive the piston to move away from the inlet end, so that the blade of the piston is retracted from the reaming opening and is contained in the movable cavity, and the drill bit is reciprocating, can be expanded for multiple times and is convenient to operate.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is a schematic view of the guide of the present invention;
FIG. 4 is a schematic structural view of a piston according to the present invention;
fig. 5 is a schematic structural diagram of the control sleeve of the present invention.
In the figure: 10. a reaming body; 11. a movable cavity; 20. a limiting shaft; 21. a blade; 30. a piston; 31. a pressure relief vent; 32. a third guide hole; 33. a first drive face; 34. a second drive face; 40. a control sleeve; 41. a first guide hole; 42. a second guide hole; 50. a guide; 51. a guide groove; 52. a pawl; 53. a pressing head is pressed; 54. a second elastic member; 60. a valve core; 61. a first flow guide hole; 62. a second flow guide hole; 63. a flow guide channel; 70. a first elastic member.
Detailed Description
The invention will be further described with reference to the accompanying drawings and the detailed description below:
as shown in fig. 1-5, the non-pitching free telescopic reamer while drilling comprises a reamer body 10, a piston 30 and a driving assembly, wherein a movable cavity 11 is arranged in the reamer body 10, and a reamer opening is arranged on the outer surface of the reamer body 10 and communicated with the movable cavity 11. One end of the movable chamber 11 is formed as an inlet end, and the other end of the movable chamber 11 is formed as an outlet end.
Specifically, the piston 30 is installed in the movable cavity 11, the piston 30 can move close to or away from the inlet end along the axial direction, and the piston 30 is connected with a blade 21, and the blade 21 can be close to or away from the reaming opening on the reaming body 10 when the piston 30 moves close to or away from the inlet end along the axial direction; and the blades 21 may extend from the reaming after the piston 30 has moved adjacent the reaming. The drive assembly may drive the piston 30 in an axial direction.
On the basis of the structure, when the non-pitching freely-telescopic type hole reamer is used, a drill bit can be connected to the outlet end part of the reaming body 10, and when a formation which is easy to incline and reduce in diameter is drilled by using a diamond drill bit, in order to prevent the reduction of the hole diameter caused by the abrasion of the drill bit and ensure that a new drill bit can smoothly go into the bottom of a well, the reamer can be used for expanding.
When the drill bit is expanded, the driving assembly can drive the piston 30 to move close to the inlet end, so that the blades 21 on the piston 30 extend out of the reaming opening, and the extended blades 21 can enable the drill bit to smoothly go into the bottom of the well. When the drill bit works normally, the piston 30 can be driven by the driving assembly to move away from the inlet end, so that the blade 21 of the piston 30 is retracted from the reaming opening and is contained in the movable cavity 11, and the operation is convenient, and the drill bit can expand for multiple times in a reciprocating manner.
Of course, the cutting teeth may be welded to the blade 21, and the cutting may be performed after reaming.
Further, the driving assembly in this embodiment includes a control sleeve 40 and a valve core 60, the control sleeve 40 is inserted into the movable cavity 11, the control sleeve 40 is fixedly connected with the inner wall of the movable cavity 11, and the control sleeve 40 and the inner wall of the movable cavity 11 may be arranged at intervals. The control sleeve 40 is provided with a first guide hole 41 and a second guide hole 42, and the first guide hole 41 and the second guide hole 42 are distributed at intervals in the axial direction of the valve core 60; the first guide holes 41 and the second guide holes 42 are circumferentially staggered.
A third guide hole 32 is provided in the piston 30, one end of the piston 30 is connected to the blade 21, the other end of the piston 30 is provided with a first driving surface 33 and a second driving surface 34, the first driving surface 33 is located on the side close to the inlet end, the second driving surface 34 is located on the side far from the inlet end, and the first guide hole 41 penetrates to the side of the second driving surface 34 far from the inlet end; the third guide hole 32 penetrates to the first drive surface 33 on the side near the inlet end.
Specifically, the valve core 60 is connected to the control sleeve 40 in a penetrating manner and is in pivot fit with the control sleeve 40, a flow guide channel 63 is arranged in the valve core 60, a first flow guide hole 61 and a second flow guide hole 62 are arranged on the side wall of the valve core 60, and the first flow guide hole 61 and the second flow guide hole 62 are distributed at intervals in the axial direction of the valve core 60.
The first guide hole 61 may communicate with the first guide hole 41 during the rotation of the spool 60 to guide the fluid in the guide passage 63 to flow to the second driving surface 34 through the first guide hole 61 and the first guide hole 41. In contrast, the second guide hole 62 is communicated with the second guide hole 42 during the rotation of the spool 60 to guide the fluid in the guide passage 63 to flow toward the first driving surface 33 through the second guide hole 62, the second guide hole 42, and the third guide hole 32.
In addition to this structure, when the valve body 60 is rotated so that the first guide hole 61 corresponds to the first guide hole 41 and the second guide hole 42 alternate in the circumferential direction, the second guide hole 42 can be closed by the outer wall of the valve body 60 and the first guide hole 41 can penetrate the second drive surface 34 when the first guide hole 61 corresponds to the first guide hole 41.
At this time, liquid can be introduced into the flow guide channel 63, the liquid can flow to the first guide hole 41 through the first flow guide hole 61 on the valve core 60, and the liquid is guided to the second drive surface 34 through the first guide hole 41, the introduced liquid forms hydraulic pressure on the second drive surface 34, as the second drive surface 34 is located on the end surface of the piston 30 far away from the inlet end, the hydraulic pressure can push the piston 30 to move close to the inlet end, and further drive the blades 21 connected with the piston 30 to move close to the inlet end, so that the blades 21 on the piston 30 can move close to the reaming opening and further extend out of the reaming opening, and thus, the reaming operation is performed by completing the dilation of the blades 21.
After the reaming of the drill is completed, the blades 21 are retracted, the valve core 60 can be continuously rotated, the first guide hole 61 is staggered with the first guide hole 41, the second guide hole 62 is communicated with the second guide hole 42, the second guide hole 42 is communicated with the third guide hole 32, liquid is introduced again, the liquid can be guided to the first driving surface 33 through the second guide hole 62, the second guide hole 42 and the third guide hole 32, namely, the liquid can be pressed on the first driving surface 33, and the first driving surface 33 is positioned on one side close to the inlet end, so that the hydraulic pressure can push the first driving surface 33 to move away from the inlet end, the piston 30 is driven to move away from the inlet end, the blades 21 connected with the piston 30 are driven to move away from the reaming opening, and the blades 21 can be accommodated in the movable cavity 11 to complete the retracting.
In summary, when the blade 21 is expanded or retracted, the valve core 60 is rotated to make the first guide hole 61 and the second guide hole 62 on the valve core 60 correspond to the corresponding first guide hole 41 and the second guide hole 42, so that the liquid can be guided to the driving surfaces in different directions to drive the piston 30 to reciprocate and operate in different directions, and the expansion can be performed for multiple times according to actual conditions.
It should be noted that, on the basis of the structure that the piston 30 is provided with a protruding ring at the end far from the inlet, the outer surface of the protruding ring is in sealing fit with the inner wall of the movable chamber 11 for facilitating hydraulic pushing, the side of the protruding ring close to the inlet is the first driving surface 33, and the side of the protruding ring far from the inlet is the second driving surface 34.
Certainly, a plurality of reaming openings can be arranged on the reaming body 10, a plurality of blades 21 are correspondingly arranged on the circumferential direction of the piston 30, the blades 21 and the reaming openings are arranged in a one-to-one correspondence manner, after the valve core 60 rotates, the piston 30 can drive the blades 21 to axially move and reciprocate once, the expansion and contraction of the blades 21 are realized, and the reaming effect is better.
In addition, a limiting shaft 20 can be arranged in the movable cavity 11, the limiting shaft 20 is positioned in the middle of the plurality of blades 21, the plurality of blades 21 can limit the position of the blades 21 after being retracted, and the limiting shaft 20 can also play a certain guiding role in the expansion process of the limiting shaft 20.
Further, the driving assembly further includes a guiding mechanism, and the guiding mechanism can guide the valve core 60 to rotate, that is, when the valve core 60 is expanded, the guiding mechanism can drive the valve core 60 to rotate, so that the rotating operation of the valve core 60 is relatively convenient.
More specifically, the guide mechanism includes a guide 50, a guide groove 51, and a guide post, the guide 50 is provided at an end of the spool 60 at the outlet end, an end of the guide 50 near the inlet end is formed as a pressing end, and the other end of the guide 50 is provided with the guide groove 51.
The specific guide groove 51 includes a first groove section extending in the axial direction of the spool 60 in the first oblique direction, and a second groove section extending in the axial direction of the spool 60 in the second oblique direction, the first groove section and the second groove communicating with each other; the first inclination direction is opposite to the second inclination direction, i.e. the first and second groove sections are inclined in two opposite directions. The guide posts are connected to the inner wall of the movable chamber 11 and movably inserted into the guide grooves 51.
Thus, when the guiding valve core 60 rotates, liquid can be introduced into the valve core 60, the hydraulic pressure of the introduced liquid can firstly push the top pressure end to move close to the outlet end, and further drive the guiding piece 50 to move close to the outlet end, in the process, the guiding column can slide along the first groove section, in the process of sliding along the first groove section, the linear motion of the guiding piece 50 can be guided in the inclined direction of the first groove section and converted into the rotating motion in the circumferential direction of the valve core 60, so that the first guide hole 61 is communicated with the first guide hole 41, and at the moment, the liquid is introduced again, and the expanding operation is performed.
During contraction, liquid can be introduced through the flow guide channel 63, the hydraulic pressure presses the pressing end again, the guide column can slide in the second groove section, during sliding along the second groove section, the linear motion of the guide piece 50 can be guided through the inclined direction of the second groove section, the inclined direction of the second groove section is opposite to the inclined direction of the first groove section, the linear motion can be converted into reverse rotation motion in the circumferential direction of the valve core 60, the second flow guide hole 62 is communicated with the second guide hole 42 and the third guide hole 32, and at the moment, the liquid is introduced again to perform the contraction operation.
Of course, in other cases, the first slot segment and the second slot segment may also be arc slot segments extending in opposite directions, and since the arc points have force resolving points, the angle of resolving and turning is relatively small, the staggered position of the corresponding first guide hole 41 and the second guide hole 42 is relatively small, which is inconvenient to machine, and two holes are easy to interfere.
Further, the first groove section and the second groove section are both provided in plurality, and the plurality of first groove sections are distributed at intervals in the circumferential direction of the valve core 60; two adjacent first groove sections are connected and communicated through the second groove section, so that the first groove section and the second groove section which are continuously connected are arranged on the periphery of the valve core 60, and continuous guide rotation can be realized without circumferential resetting in the hydraulic jacking process.
Further, a limiting step may be disposed on the inner wall of the outlet end of the movable cavity 11, and a first elastic member 70 is sandwiched between the side surface of the limiting step close to the inlet end and the top pressing end, so that when the top pressing end is pressed for the first time, the guiding column slides from one end of the first groove section to the other end of the first groove section, so that the first elastic member 70 is compressed, and when the top pressing end is pressed again, the guiding column continues to slide along the second groove section, the first elastic member 70 resets, and during the retracting process of the wing knife 21, the valve core 60 rotates faster.
Furthermore, a pressing head 53 may be further provided at the pressing end, a second elastic member 54 is sandwiched between the pressing head 53 and the end of the guide 50, and the elastic coefficient of the second elastic member 54 is greater than that of the first elastic member 70, so that the second elastic member 54 is not easily compressed, that is, the pressing head 53 is directly pressed during a hydraulic operation, the first elastic member 70 is compressed, and the valve element 60 can normally rotate. In the long-term use process, the pressing head 53 may be worn, so the pressing head 53 can be rotated, the second elastic component 54 extends relatively, the wear can be compensated, and the normal pressing operation is prevented from being influenced by the wear of the pressing head 53, and the rotation of the valve core 60 is prevented from being influenced.
Of course, without the above-described guide assembly, the portion of the valve core 60 near the inlet end may also extend beyond an operating edge for manual rotation. In other cases, a spiral groove may be formed in the inner wall of the valve core 60, and a tool may be inserted into the valve core 60 to cooperate with the spiral groove to guide the rotation of the valve core 60.
Further, a pawl 52 may be further disposed on an inner wall of the guide 50 away from the outlet end, the pawl 52 abuts against a side surface of the limit step away from the inlet end, and the pawl 52 may limit an axial position of the valve core 60 in the movable chamber 11, so as to prevent the valve core from being displaced by hydraulic operation, thereby affecting the correspondence of the hole positions.
Further, a nozzle is arranged on the reaming body 10, a pressure relief hole 31 is correspondingly arranged on the piston 30, after the blade 21 extends out of the reaming opening, namely when the blade 21 is expanded in place, the pressure relief hole 31 can be communicated with the nozzle, and liquid led out through the first guide hole 41 of the control sleeve 40 can be communicated with the nozzle through the pressure relief hole 31 on the piston 30 and led out for pressure relief, so that later contraction and resetting are facilitated.
Further, in this embodiment, a guiding inclined plane may be further disposed on an inner wall of an inlet end of the movable cavity 11, the guiding inclined plane is engaged with the reaming opening, the guiding inclined plane is used for guiding the blade 21 to move to the reaming opening when the piston 30 moves close to the reaming opening, that is, when the piston is expanded, the guiding inclined plane outside the piston 30 may be in sliding fit with the blade 21, the guiding blade 21 gradually extends out from the reaming opening, and when the piston is contracted, the guiding inclined plane is in sliding fit with the blade 21, the guiding blade 21 gradually retracts, and a situation of jamming easily occurs on a relatively straight surface, so that the guiding inclined plane is engaged with the expanding and contracting processes smoothly.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.
Claims (10)
1. A non-pitching free telescopic type reamer while drilling is characterized by comprising,
the reaming body is internally provided with a movable cavity; the outer surface of the reaming body is provided with a reaming opening; the eye-expanding opening is communicated with the movable cavity; one end of the movable cavity is formed into an inlet end, and the other end of the movable cavity is formed into an outlet end;
the piston is arranged in the movable cavity and can move close to or far away from the inlet end along the axial direction; the piston is connected with a blade; the blade is used for approaching or separating from the reaming opening when the piston moves close to or far from the inlet end along the axial direction, and the blade is used for extending out of the reaming opening after the piston moves close to the reaming opening;
and the driving assembly is used for driving the piston to move along the axial direction.
2. The non-pitching free telescoping reamer of claim 1, wherein the drive assembly comprises a control sleeve and a valve spool,
the control sleeve is connected in the movable cavity in a penetrating manner; the control sleeve is provided with a first guide hole and a second guide hole which are distributed at intervals in the axial direction of the valve core; the first guide holes and the second guide holes are distributed in a staggered mode in the circumferential direction;
a third guide hole is formed in the piston, one end of the piston is connected with the blade, a first driving surface and a second driving surface are arranged at the other end of the piston, the first driving surface is located on one side close to the inlet end, and the second driving surface is located on one side far away from the inlet end; the first guide hole penetrates through the second driving surface to one side far away from the inlet end; the third guide hole penetrates through the first driving surface to one side close to the inlet end;
the valve core is connected to the control sleeve in a penetrating way and is matched with the control sleeve in a pivoting way; a flow guide channel is arranged in the valve core; a first flow guide hole and a second flow guide hole are formed in the side wall of the valve core; the first flow guide holes and the second flow guide holes are distributed at intervals in the axial direction of the valve core; the first guide hole is used for communicating with the first guide hole in the rotation process of the valve core so as to guide the fluid in the guide channel to flow to the second driving surface through the first guide hole and the first guide hole; the second guide hole is used for being communicated with the second guide hole in the rotating process of the valve core so as to guide the fluid in the guide channel to flow to the first driving surface through the second guide hole, the second guide hole and the third guide hole.
3. The non-pitching free telescoping reamer of claim 2, wherein the drive assembly further comprises a guide mechanism for guiding the valve spool in rotation.
4. The non-pitching free telescoping reamer-while-drilling tool of claim 3, wherein the guide mechanism comprises a guide member, a guide slot, and a guide post, the guide member being disposed at an end of the valve spool at the outlet end; the end part of the guide piece close to the inlet end is formed into a jacking end; the other end of the guide piece is provided with the guide groove; the guide groove comprises a first groove section and a second groove section, and the first groove section extends in the axial direction of the valve core along a first inclined direction; the second groove section extends along a second inclined direction in the axial direction of the valve core; the first groove section is communicated with the second groove; the first inclination direction is opposite to the second inclination direction; the guide column is connected to the inner wall of the movable cavity; the guide post is movably connected in the guide groove in a penetrating manner.
5. The non-pitching free telescoping reamer-while-drilling tool of claim 4, wherein a plurality of the first slot segments and the second slot segments are provided; the first groove sections are distributed at intervals in the circumferential direction of the valve core; two adjacent first groove sections are connected and communicated through the second groove section.
6. The non-pitching free telescopic reamer-while-drilling device of claim 4, wherein the inner wall of the outlet end of the movable cavity is provided with a limiting step, and a first elastic component is clamped between the side surface of the limiting step close to the inlet end and the top pressing end.
7. The non-pitching free telescopic reamer of claim 6, wherein the top pressing end is provided with a top pressing head, a second elastic member is clamped between the top pressing head and the end of the guide member, and the elastic coefficient of the second elastic member is greater than that of the first elastic member.
8. The non-pitching free telescopic reamer-while-drilling device of claim 6, wherein a pawl is arranged on the inner wall of the guide piece far away from the outlet end, and the pawl abuts against the side surface of the limiting step far away from the inlet end.
9. The non-pitching free telescopic reamer while drilling of any one of claims 2 to 8, wherein the reamer body is provided with a nozzle, and the piston is provided with a pressure relief hole for communicating with the nozzle after the blades extend out of the reamer mouth.
10. The non-pitching free telescopic reamer-while-drilling tool of any one of claims 1 to 8, wherein the inner wall of the inlet end of the movable cavity is provided with a guide inclined surface, the guide inclined surface is engaged with the reaming opening, and the guide inclined surface is used for guiding the blades to move to the reaming opening when the piston moves close to the reaming opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110469770.0A CN113153162B (en) | 2021-04-28 | 2021-04-28 | Non-ball-throwing free telescopic reamer while drilling |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110469770.0A CN113153162B (en) | 2021-04-28 | 2021-04-28 | Non-ball-throwing free telescopic reamer while drilling |
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| CN113153162A true CN113153162A (en) | 2021-07-23 |
| CN113153162B CN113153162B (en) | 2024-02-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113153162B (en) | 2024-02-27 |
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