CN113513270B - Micro-reaming bit - Google Patents
Micro-reaming bit Download PDFInfo
- Publication number
- CN113513270B CN113513270B CN202110884282.6A CN202110884282A CN113513270B CN 113513270 B CN113513270 B CN 113513270B CN 202110884282 A CN202110884282 A CN 202110884282A CN 113513270 B CN113513270 B CN 113513270B
- Authority
- CN
- China
- Prior art keywords
- connector
- side wall
- insertion section
- outer side
- groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000003780 insertion Methods 0.000 claims abstract description 53
- 230000037431 insertion Effects 0.000 claims abstract description 53
- 239000011435 rock Substances 0.000 claims abstract description 42
- 238000005553 drilling Methods 0.000 claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 26
- 239000010959 steel Substances 0.000 claims abstract description 26
- 210000001503 joint Anatomy 0.000 claims description 15
- 238000003032 molecular docking Methods 0.000 claims description 11
- 230000007704 transition Effects 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Classifications
-
- 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
- E21B10/26—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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
- E21D9/11—Making by using boring or cutting machines with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to the technical field of drill bits, and discloses a micro-reaming drill bit, which comprises a connector connected to the bottom of a drilling bucket and a movable head movably connected to the connector, wherein the movable head comprises an insertion section and a tip connected to the bottom of the insertion section, and drilling teeth are convexly arranged on the tip; the connecting head is provided with a rail groove which extends up and down and is used for the movable insertion of the insertion section, and the insertion section is inserted into the rail groove from bottom to top; the connector is provided with an outer side wall which is arranged outwards, and when the drill bit passes through the steel sleeve, a gap is reserved between the outer side wall of the connector and the steel sleeve; when the insertion section moves upwards to the limit position, the end head deviates from the outer side wall of the connector to outwards deviate from the arrangement, when the insertion section moves downwards to the limit position, the end head deviates from the outer side wall of the connector to inwards deviate from the arrangement, during drilling, the drill bit contacts rock, the retraction rail groove of the insertion section moves upwards to the limit position, so that the end head deviates from the outer side wall of the connector to outwards deviate, the end head deviates from the outer side of the steel sleeve opening to expand the grinding range, and micro reaming of the drill bit is realized.
Description
Technical Field
The invention relates to the technical field of drill bits, in particular to a micro-reaming drill bit.
Background
Along with the development of the building industry, the depth of the foundation pit is deeper and deeper, the embedding depth of the supporting structure is also deeper and deeper, and the supporting structure starts to generate rock embedding requirements.
In the prior art, a common pipe twisting machine is adopted, and although the perpendicularity is better controlled, the pipe cannot enter the rock; if a full-sleeve full-rotary drilling machine is adopted, the verticality precision is well controlled, but the efficiency is low, and the cost is high; at present, many projects adopt rotary digging hard biting into rock, but because of no steel sleeve, the verticality is not well controlled, the precision is not high, and especially the verticality is worse in complex strata such as rock and the like; if the steel sleeve is driven by the rotary hydraulic driver, the efficiency is high, but the steel sleeve is difficult to enter the rock, and only the earth-rock interface can be reached.
The drilling method is characterized in that the drilling method is used for the engineering that the steel casing can only reach the rock surface but cannot continue drilling in the entering stratum, when stratum drilling is carried out, the drill bit needs to drill in advance in the steel casing, in the drilling process, the diameter of a drill bucket needs to be smaller than the inner diameter of the steel casing by 7-15cm for entering the steel casing, and therefore the drilling diameter of the drill bit is smaller than the inner diameter of the casing, and therefore the drill bit and the steel casing cannot drill in the stratum with the same diameter up and down.
Disclosure of Invention
The invention aims to provide a micro-reaming bit, which aims to solve the problem that in the prior art, the bit and a steel sleeve cannot drill in rock stratum with the same diameter up and down.
The micro reaming bit comprises a connector connected to the bottom of a drilling bucket and a movable head movably connected to the connector, wherein the movable head comprises an insertion section and a tip connected to the bottom of the insertion section, and drilling teeth are convexly arranged on the tip; the connecting head is provided with a rail groove which is arranged in an extending way up and down and is used for the movable insertion of the insertion section, and the insertion section is inserted into the rail groove from bottom to top; the connector is provided with an outer side wall which is arranged outwards, and when the drill bit passes through the steel sleeve, a gap is reserved between the outer side wall of the connector and the steel sleeve; when the insertion section moves upwards to the limit position, the end head is arranged in an outward deviating way from the outer side wall of the connector, and when the insertion section moves downwards to the limit position, the end head is arranged in an inward deviating way from the outer side wall of the connector.
Further, the rail groove is a groove strip formed in the connector, the groove strip penetrates through the bottom of the connector to form a bottom opening, and the insertion section is inserted into the groove strip through the bottom opening of the groove strip.
Further, along the direction from top to bottom of the connector, the slot strip and the insertion section are respectively arranged in an outward arc shape, and the insertion section and the slot strip are arranged in an arc shape with the same radian.
Further, a counter bore communicated with the groove strip is formed in the outer side wall of the connector, a limiting head is arranged in the counter bore, the limiting head is provided with a limiting section penetrating through the groove strip, the inserting section is provided with a limiting side wall arranged outwards, and the limiting side wall is arc-shaped along the direction from top to bottom of the inserting section; the limiting side wall is provided with a limiting groove, the limiting groove is arranged along the moving direction of the inserting section in the groove strip in an extending mode, and the limiting section is movably arranged in the limiting groove.
Further, the outermost side of the outer side wall of the connector is longitudinally arranged to form a longitudinal wall.
Further, the longitudinal wall is recessed inwards to form the counter bore, the longitudinal side wall is provided with a top side wall and a bottom side wall, the top side wall and the bottom side wall are oppositely arranged, and the top side wall and the bottom side wall are upwards and obliquely arranged in the same direction along the direction from inside to outside.
Further, the end head is provided with a spherical surface which is arranged downwards and outwards, and the drilling teeth are convexly arranged on the spherical surface.
Further, the spherical surface is provided with a rock surface abutting part which is downwards abutted against the rock surface and a hole wall abutting part which is outwards abutted against the hole wall; when the insertion section moves upwards to the limit position, the rock surface abutting part abuts against the rock surface from top to bottom, and the hole wall abutting part abuts against the hole wall from inside to outside; the rock face abutting part and the hole wall abutting part are respectively provided with the drilling teeth in a protruding mode.
Further, the spherical surface is provided with a transition abutting part positioned between the rock surface abutting part and the hole wall abutting part, the transition abutting part is convexly provided with the drilling teeth, and when the insertion section moves upwards to the limit position, the drilling teeth on the rock surface abutting part are obliquely abutted downwards at the junction of the hole wall and the rock surface.
Further, a butt joint platform is arranged between the end head and the insertion section, the butt joint platform is provided with a lower butt joint plane which is arranged upwards, the bottom of the connector is provided with an upper butt joint plane which is arranged downwards, and the upper butt joint plane is horizontally arranged; when the insertion section moves upwards to the limit position, the lower butt joint plane is horizontally arranged and is in fit butt joint with the upper butt joint plane from bottom to top.
Compared with the prior art, when the micro-reaming bit is used, the movable head sags under the action of gravity, the insertion section moves downwards to the limit position, and the movable head contracts inwards, so that a gap is reserved between the outer side wall of the connector and the steel sleeve, and the drilling bucket can pass through the steel sleeve; when the drill bit touches rock, the insertion section retracting rail groove moves upwards to a limit position, so that the end head deviates from the outer side wall of the connector and outwards deviates from the steel sleeve opening, the grinding range is enlarged, and micro reaming of the drill bit is realized.
Drawings
FIG. 1 is an overall schematic of a micro-reamer bit provided by the present invention;
FIG. 2 is an overall schematic of a micro-reamer bit provided by the present invention;
fig. 3 is a schematic view of the movable head of the micro reamer bit provided by the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The implementation of the present invention will be described in detail below with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.
Referring to fig. 1-3, a preferred embodiment of the present invention is provided.
The micro-reaming bit comprises a connector 108 connected to the bottom of a drilling bucket and a movable head 100 movably connected to the connector 108, wherein the movable head 100 comprises an insertion section 105 and a tip 107 connected to the bottom of the insertion section 105, and drilling teeth 101 are convexly arranged on the tip 107; the connector 108 is provided with a rail groove which extends up and down and is used for the movable insertion of the insertion section 105, and the insertion section 105 is inserted into the rail groove from bottom to top;
the connector 108 has an outer sidewall arranged outwards, and when the drill bit passes through the steel casing, a gap is formed between the outer sidewall of the connector 108 and the steel casing; when the insert section 105 is moved upwards to the extreme position, the end head 107 is arranged offset outwards from the outer side wall of the connecting head 108, and when the insert section 105 is moved downwards to the extreme position, the end head 107 is arranged offset inwards from the outer side wall of the connecting head 108.
When the micro-reaming bit is used, the free-state bit sags under the action of gravity, the insertion section 105 moves downwards to the limit position, the movable head 100 contracts inwards, a gap is reserved between the outer side wall of the connector 108 and the steel sleeve, and the drilling bucket can pass through the steel sleeve; when the drill bit touches rock, the retraction rail groove of the insertion section 105 moves upwards to a limit position, so that the end head 107 deviates from the outer side wall of the connector 108 and outwards deviates from the steel sleeve opening to expand the grinding range, and micro reaming of the drill bit is realized.
The rail groove is a groove strip 106 formed in the connector 108, the groove strip 106 penetrates through the bottom of the connector 108 to form a bottom opening, the insertion section 105 is inserted into the groove strip 106 through the bottom opening of the groove strip 106 and moves up and down in the groove strip 106, and the position state of the movable head 100 on the insertion section 105 is changed.
Further, along the direction from top to bottom of the connector 108, the groove strips 106 and the insertion sections 105 are respectively arranged outwards in the same arc, and the groove strips 106 and the insertion sections 105 under the arc arrangement cooperate to enable the end heads 107 to deviate from the outer side wall of the connector 108 outwards to deviate from the wall of the steel sleeve, so that micro reaming is realized relative to the steel sleeve.
The outer side wall of the connector 108 is provided with a counter bore 109 communicated with the groove strip 106, the counter bore 109 is internally provided with a limiting head 110, the limiting head 110 is provided with a limiting section penetrating through the counter bore 109 and arranged in the groove strip 106, the limiting head 110 is inserted into the counter bore 109 to limit the inserting section 105 to move in the limiting section in the groove strip 106, the inserting section 105 is provided with a limiting side wall 113 which is outwards arranged and along the direction from top to bottom of the inserting section 105, the limiting side wall 113 is arc-shaped and has the same radian with the groove strip 106, and the inserting section 105 can move freely in the groove strip 106;
the limiting side wall 113 is provided with a limiting groove 104, and the limiting groove 104 is arranged along the moving direction of the inserting section 105 in the groove strip 106 in an extending mode, and the movement of the limiting section is limited in the limiting groove 104, so that the inserting section 105 of the drill bit is limited to move in the limiting groove 104.
The outermost side of the outer side wall of the connector 108 is longitudinally arranged to form a longitudinal wall, a counter bore 109 is formed by inwards sinking the longitudinal wall to be used for inserting a limiting head 110, the limiting head 110 is used for limiting the insertion section in the limiting groove 104, the movable head 100 is prevented from falling out of the connector 108, the longitudinal side wall is provided with a top side wall 111 and a bottom side wall 112, the top side wall 111 and the bottom side wall 112 are oppositely arranged, the top side wall 111 and the bottom side wall 112 are obliquely arranged upwards in the same direction along the direction from inside to outside, a protective shell is formed in the groove strip 106, and the insertion section 105 is protected from normally moving in the groove strip 106.
Specifically, the end 107 of the movable head 100 has a spherical surface 102 facing downward and outward, and the drill teeth 101 are convexly disposed on the spherical surface 102, so that the spherical surface 102 has a wider contact surface with the rock surface, and is convenient for contacting the rock surface to grind the surrounding rock. The spherical surface 102 has a rock surface abutting portion that abuts against the rock surface downwards and a hole wall abutting portion that abuts against the hole wall outwards, and drilling and grinding are facilitated by contact between the abutting portion and the rock surface and the hole wall.
When the insertion section 105 moves upwards to the limit position, the rock surface abutting part abuts against the rock surface from top to bottom, and the hole wall abutting part abuts against the hole wall from inside to outside, so that the peripheral hole wall and the rock surface at the bottom are ground; the rock surface abutting part and the hole wall abutting part are respectively provided with the drilling teeth 101 in a protruding mode, and the drilling teeth 101 are beneficial to improving drilling efficiency and drilling hard rock.
The spherical surface 102 has a transition abutting portion between the rock surface abutting portion and the hole wall abutting portion, the transition abutting portion is convexly provided with the drilling teeth 101, when the insertion section 105 moves upwards to the limit position, the drilling teeth 101 on the rock surface abutting portion are obliquely abutted downwards at the junction of the hole wall and the rock surface, and when drilling, the drilling teeth 101 on the spherical surface 102 are fully contacted with surrounding rock.
A docking platform 103 is arranged between the end 107 and the insertion section 105 on the movable head 100, the docking platform 103 is provided with a lower docking plane which is upwards arranged, the bottom of the connector 108 is provided with an upper docking plane which is downwards arranged, the upper docking plane is horizontally arranged, the docking platform 103 is provided with a function of increasing the stress area of the movable head 100 and also can play a role of reinforcing the movable head 100; when the insertion section 105 moves upwards to the limit position, the lower butt joint plane is horizontally arranged and is in abutting butt joint with the upper butt joint plane from bottom to top, so that the movable head 100 and the connector 108 are uniformly stressed at the butt joint platform 103.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. The micro-reaming drill bit is characterized by comprising a connector connected to the bottom of a drilling bucket and a movable head movably connected to the connector, wherein the movable head comprises an insertion section and a tip connected to the bottom of the insertion section, and drilling teeth are convexly arranged on the tip; the connecting head is provided with a rail groove which extends up and down and is used for the movable insertion of the insertion section, and the insertion section is inserted into the rail groove from bottom to top;
the connector is provided with an outer side wall which is arranged outwards, and when the drill bit passes through the steel sleeve, a gap is reserved between the outer side wall of the connector and the steel sleeve; when the insertion section moves upwards to the limit position, the end head is outwards biased away from the outer side wall of the connector, and when the insertion section moves downwards to the limit position, the end head is inwards biased away from the outer side wall of the connector;
the rail groove is a groove strip formed in the connector, the groove strip penetrates through the bottom of the connector to form a bottom opening, and the insertion section is inserted into the groove strip through the bottom opening of the groove strip;
the groove strips and the insertion sections are respectively outwards arranged in an arc shape along the direction from top to bottom of the connector, and the insertion sections and the groove strips are arranged in an arc shape with the same radian;
the outer side wall of the connector is provided with a counter bore communicated with the groove strip, a limiting head is arranged in the counter bore, the limiting head is provided with a limiting section penetrating through the groove strip, the inserting section is provided with a limiting side wall arranged outwards, and the limiting side wall is arc-shaped along the direction from top to bottom of the inserting section; the limiting side wall is provided with a limiting groove, the limiting groove is arranged along the moving direction of the inserting section in the groove strip in an extending mode, and the limiting section is movably arranged in the limiting groove.
2. The micro reamer bit of claim 1, wherein an outermost side of the outer side wall of the connector is longitudinally disposed, forming a longitudinal wall.
3. The micro reamer bit of claim 2, wherein the longitudinal wall is recessed inwardly to form the counterbore, the longitudinal sidewall having a top sidewall and a bottom sidewall, the top sidewall being disposed opposite the bottom sidewall, the top sidewall and the bottom sidewall being disposed obliquely upward and in a same direction along a direction from inside to outside.
4. The micro reamer bit of claim 1, wherein the tip has a downwardly and outwardly disposed spherical surface, the teeth protruding from the spherical surface.
5. The micro reamer bit of claim 4, wherein the spherical surface has a rock surface abutment that abuts the rock surface downwardly and a hole wall abutment that abuts the hole wall outwardly; when the insertion section moves upwards to the limit position, the rock surface abutting part abuts against the rock surface from top to bottom, and the hole wall abutting part abuts against the hole wall from inside to outside; the rock face abutting part and the hole wall abutting part are respectively provided with the drilling teeth in a protruding mode.
6. The micro reamer bit of claim 5, wherein the spherical surface has a transition abutment between the rock surface abutment and the hole wall abutment, the transition abutment being provided with the drilling teeth protruding therefrom, the drilling teeth on the rock surface abutment being downwardly angled against the junction of the hole wall and the rock surface when the insert section is moved upwardly to a limit position.
7. The micro reamer bit of claim 1, wherein a docking platform is provided between the tip and the insert segment, the docking platform having a lower docking plane disposed upwardly, the bottom of the connector having an upper docking plane disposed downwardly, the upper docking plane being disposed horizontally; when the insertion section moves upwards to the limit position, the lower butt joint plane is horizontally arranged and is in fit butt joint with the upper butt joint plane from bottom to top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110884282.6A CN113513270B (en) | 2021-08-03 | 2021-08-03 | Micro-reaming bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110884282.6A CN113513270B (en) | 2021-08-03 | 2021-08-03 | Micro-reaming bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113513270A CN113513270A (en) | 2021-10-19 |
| CN113513270B true CN113513270B (en) | 2023-12-08 |
Family
ID=78067822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110884282.6A Active CN113513270B (en) | 2021-08-03 | 2021-08-03 | Micro-reaming bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113513270B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002013379A (en) * | 2000-04-25 | 2002-01-18 | Mitsubishi Materials Corp | Excavation tool |
| WO2014082367A1 (en) * | 2012-11-27 | 2014-06-05 | 恒天九五重工有限公司 | Adjustable drilling bucket of rotary drilling rig |
| CN203925292U (en) * | 2014-03-18 | 2014-11-05 | 天津市八方工程机械设备有限公司 | A kind of revolving dug reaming bit |
| CN207393122U (en) * | 2017-11-04 | 2018-05-22 | 浙江省化工工程地质勘察院 | A kind of combined type reaming bit |
| CN211256961U (en) * | 2019-08-01 | 2020-08-14 | 广州市第三市政工程有限公司 | High-pressure rotary jet pile machine |
| KR102172162B1 (en) * | 2020-06-01 | 2020-10-30 | 전재운 | Sliding expanded bit body for reverse circulation drill |
| CN211900467U (en) * | 2020-03-17 | 2020-11-10 | 三江友利(江苏)高新科技有限公司 | Swing type reaming drill bit |
-
2021
- 2021-08-03 CN CN202110884282.6A patent/CN113513270B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002013379A (en) * | 2000-04-25 | 2002-01-18 | Mitsubishi Materials Corp | Excavation tool |
| WO2014082367A1 (en) * | 2012-11-27 | 2014-06-05 | 恒天九五重工有限公司 | Adjustable drilling bucket of rotary drilling rig |
| CN203925292U (en) * | 2014-03-18 | 2014-11-05 | 天津市八方工程机械设备有限公司 | A kind of revolving dug reaming bit |
| CN207393122U (en) * | 2017-11-04 | 2018-05-22 | 浙江省化工工程地质勘察院 | A kind of combined type reaming bit |
| CN211256961U (en) * | 2019-08-01 | 2020-08-14 | 广州市第三市政工程有限公司 | High-pressure rotary jet pile machine |
| CN211900467U (en) * | 2020-03-17 | 2020-11-10 | 三江友利(江苏)高新科技有限公司 | Swing type reaming drill bit |
| KR102172162B1 (en) * | 2020-06-01 | 2020-10-30 | 전재운 | Sliding expanded bit body for reverse circulation drill |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113513270A (en) | 2021-10-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2713542C2 (en) | Drilling bit with extending calibrating platforms | |
| KR100919628B1 (en) | If the excavation where the carbide tip is had excavation bit of the excavation system where the expansion and abridgment are possible | |
| US20070034384A1 (en) | Whipstock liner | |
| CA2238782A1 (en) | Method and apparatus for radially drilling through well casing and formation | |
| CN103742188B (en) | Colliery drawing-off gas well and boring method | |
| CN104314482A (en) | Closed type helical hole-protecting drill and using method thereof for drilling of soft coal bed | |
| CN104453712A (en) | While-drilling sleeve directional drilling device and method for soft coal seams of underground coal mine | |
| CN104847263A (en) | Coal bed methane far-end butt joint horizontal well drilling method | |
| CN105275396A (en) | Whipstock for casing pipes below mud line and applicable to abandoned wellhead slot recycle | |
| CN211737051U (en) | Deviation-preventing rotary drilling bit and rotary drilling rig | |
| CN104912479A (en) | Method for drilling and completion of horizontal branched well for coal bed gas | |
| CN107178315B (en) | Near-bit composite torsion-reducing rock breaking device | |
| CN113513270B (en) | Micro-reaming bit | |
| US2281414A (en) | Combined bridge plug and drilable whipstock | |
| CN113565441B (en) | Complete casing pore-forming construction method with same diameter up and down | |
| CN202117567U (en) | Self-cleaning reaming device while drilling | |
| CA2570538C (en) | Steerable drill bit arrangement | |
| CN102889064B (en) | Method for fixing underground corrugated pipe | |
| CN104912480B (en) | Coal bed gas near-end docks the brill completion method of horizontal well | |
| CN112127799A (en) | Diamond compact bit | |
| CN112681296A (en) | Full-casing construction method for rotary digging cast-in-place pile | |
| CN205100874U (en) | A mud line is with case slant ware that is used for abandonment well head groove to recycle | |
| CN216477161U (en) | Concentric casing drilling tool for drilling stratum | |
| CN213392002U (en) | Diamond compact bit | |
| CN212958533U (en) | PDC borehole restorer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |