CN103161406A - Rock reamer - Google Patents
Rock reamer Download PDFInfo
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- CN103161406A CN103161406A CN2013100693068A CN201310069306A CN103161406A CN 103161406 A CN103161406 A CN 103161406A CN 2013100693068 A CN2013100693068 A CN 2013100693068A CN 201310069306 A CN201310069306 A CN 201310069306A CN 103161406 A CN103161406 A CN 103161406A
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Abstract
The invention discloses a rock reamer. The rock reamer comprises a hollow central shaft which is connected with a drill rod, a front pilot and a back pilot which are fixedly arranged on the hollow central shaft, and a hobbing cutter which can conduct autorotation and is arranged between the front pilot and the back pilot. A central axis of the hobbing cutter and the central shaft are parallelly arranged, the hobbing cutter comprises a cylindrical section which has a righting function and a front end face formed at the front end of the cylindrical section, and hard alloy teeth used for crushing rocks are evenly distributed on the front end face and the peripheral surface of the cylindrical section. By improving a hobbing cutter structure and arranging positions, the phenomenon that a matched righting machine is additionally arranged on a reamer is effectively avoided, weight of tool is reduced, rotation torsion moment is reduced, cost is lowered, and service life of the tool is prolonged. In addition, the hobbing cutter is clamped or connected between the front pilot and the back pilot in a threaded mode, and therefore disassembly of the hobbing cutter is convenient.
Description
Technical field
The present invention relates to rock and pass through the engineering construction field, particularly relate to a kind of rock reamer.
Background technology
At present, rock passes through in engineering field and mine, well, oilfield applications reaming work progress, often meets rock, and each unit in charge of construction or drilling tool manufacturer adopt the dual mode reaming:
A kind of is that oil is used the cone palm welded construction, and adopt the problem of this structure to be: when 1, welding, excess Temperature is sealed with damage to the gear wheel bearing; 2, replacing efficient is low, need to cut off the gear wheel of scrapping, then weld new gear wheel, often wants the time of a couple of days; 3, the cone palm back is easy to wearing and tearing, and may wear to a certain degree will be worn out sealing, causes gear wheel to lose efficacy, and even causes gear wheel to fall in the hole, causes drilling accident.
The second is replaceable hob type rock reamer, and replaceable hob type rock reamer has solved the problem of falling wheel and the wearing and tearing of the cone palm back of the body.
But above two kinds of reamers are passing through rock reaming process for large-scale pipeline, after surpassing 800MM as 711 above pipeline counter bore diameters, following use problem is arranged: reamer adds that supporting centralizer weight is very heavy, drilling tool is beated greatly, driving torque is also very large, but when surpassing the drilling rod tolerance range, causes drilling rod to rupture in a large number, process very difficult, even causing boring scraps.When cutting simultaneously, rock particles is large, and inconvenient mud carries, and the rock slag is piled up in the hole, causes reaming and trustship difficulty.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind ofly be convenient to change hobboing cutter, moment of torsion is low and the rock reamer of long service life.
In order to solve the problems of the technologies described above, technical scheme of the present invention is as follows:
Described rock reamer comprise the hollow of jointed rod central axis, be packed in front correcting and the rear correcting on described central axis and be arranged between described front correcting and rear correcting and hobboing cutter that can rotation, the central axis of described hobboing cutter and described central axes setting, described hobboing cutter comprises the cylindrical section with centralizing function and is formed on the front end face of this cylindrical section front end, be evenly equipped with the hard-metal insert for fractured rock on the outer peripheral face of described front end face and cylindrical section.
The axle that described hobboing cutter comprises shell and is arranged on the shell middle part also is provided with bearing and sealing device between shell and axle.
Described hobboing cutter is provided with three at least at described central axis circumferencial direction, and described front correcting and rear correcting all are provided with three at least at described central axis circumferencial direction.
according to one embodiment of present invention, described leading just rearward is provided with dish on, described rear correcting front portion is provided with a low bottom-disc, coil on described, the interval of two described front correctings all is fixedly connected with a upper cutter head, described upper cutter head middle part is formed with circular hole on, the bottom is formed with draw-in groove on, on described low bottom-disc, the interval of every two described rear correctings all is fixedly connected with tool rest, described lower tool rest middle part is formed with circular hole, the upper end is formed with a lower bayonet slot, on described, the center line of lower circular hole overlaps, on described, lower bayonet slot is the square circular groove that a side is formed with an opening.
Described hobboing cutter is the cylindricality hobboing cutter, and the front end face of this cylindricality hobboing cutter is sphere or the conical surface, and this cylindricality hobboing cutter is arranged between described upper and lower tool rest by a location bearing pin, and described cylindricality hobboing cutter can rotate with respect to its axle.
The middle part hollow of described cylindricality cutter shaft, described alignment pin are passed the axle of circular hole, cylindricality hobboing cutter successively and the two ends of lower circular hole and this alignment pin are in respectively in described upper and lower circular hole also removably fixing by fastening devices.
The two ends of described alignment pin removably are fixed in described upper and lower circular hole by a pin respectively.
The shaft shoulder gabarit at the axle two ends of described cylindricality hobboing cutter is the square circular that is complementary with upper and lower draw-in groove, and the shaft shoulder at the axle two ends of this cylindricality hobboing cutter snaps in respectively in upper and lower draw-in groove and makes axle and upper and lower tool rest circumferentially fix.
Adopt technique scheme, due to hobboing cutter and central axes setting, also be provided with cylindrical section on hobboing cutter, such structure has played the effect of roller centralizer, thereby avoided adding the centralizer of assembly set on reamer, alleviated instrument weight, reduced driving torque, reduce cost, strengthened the application life of instrument.Its axle rotation relatively of the shell of described hobboing cutter, the hobboing cutter of circumferential uniform setting and forward and backward correcting can make the stability of instrument stronger, and functional reliability is high.Described cylindricality hobboing cutter is arranged on upper and lower tool rest by alignment pin, does not need other welding, has facilitated replacing cylindricality hobboing cutter; Such structure does not exist oil to carry on the back the problem of effect of attrition sealing with cone palm, effectively raises the application life of cylindricality hobboing cutter; Simultaneously, the cylindrical section of cylindricality hobboing cutter plays the effect of roller centralizer, does not need other supporting centralizer, has greatly alleviated drilling tool weight, effectively reduces moment of torsion, and stability of rotation makes the risk of drill rod breaking drop to minimum.In addition, the hard-metal insert of cylindricality hobboing cutter front end face cuts fractured rock, reaches the purpose of reaming in rock, and the hard-metal insert on cylindrical section is the bulky grain rock slag under broken cutting in rolling process, facilitate mud to carry, realized the combination function of reamer rock cutting, righting and detritus.
According to another embodiment of the invention, described rock reamer comprise the hollow of jointed rod central axis, be packed in front correcting and the rear correcting on described central axis and be arranged between described front correcting and rear correcting and hobboing cutter that can rotation, the central axis of described hobboing cutter and described central axes setting, described hobboing cutter comprises the cylindrical section with centralizing function and is formed on the front end face of this cylindrical section front end, be evenly equipped with the hard-metal insert for fractured rock on the outer peripheral face of described front end face and cylindrical section.
The axle that described hobboing cutter comprises shell and is arranged on the shell middle part also is provided with bearing and sealing device between shell and axle.
Described hobboing cutter is provided with three at least at described central axis circumferencial direction, and described front correcting and rear correcting all are provided with three at least at described central axis circumferencial direction.
Described hobboing cutter is conical hob, the front end face of this conical hob is sphere or the conical surface, the bottom of the axle of described conical hob is fixedly connected with a contiguous block, this contiguous block bottom is fixedly connected with one or six sides, described contiguous block is that back taper and external surface are formed with screw thread, the axle of described conical hob is threaded in rear correcting top by contiguous block, and described conical hob can rotate with respect to its axle.
Be reserved with the headspace that conical hob is installed between described front correcting and conical hob, described rear correcting upper end is provided with a chassis, be welded with a base that is threaded with contiguous block on this chassis, this base bottom is provided with for the shrinkage pool of placing six sides, and the volume of this shrinkage pool is greater than six sides' volume and can hold spanner and rotate six sides in shrinkage pool.
Adopt technique scheme, due to hobboing cutter and central axes setting, also be provided with cylindrical section on hobboing cutter, such structure has played the effect of roller centralizer, thereby avoided adding the centralizer of assembly set on reamer, alleviated instrument weight, reduced driving torque, reduce cost, strengthened the application life of instrument.Its axle rotation relatively of the shell of described hobboing cutter, the hobboing cutter of circumferential uniform setting and forward and backward correcting can make the stability of instrument stronger, and functional reliability is high.Described conical hob is installed together by screw thread and rear correcting, need not weld, and rotates six sides by spanner and get final product conical hob for convenience detach in shrinkage pool; Such structure does not exist oil with the problem of cone palm back of the body effect of attrition sealing, effectively raises the conical hob life-span; Simultaneously, the cylindrical section of conical hob plays the effect of roller centralizer, does not need other supporting centralizer, has greatly alleviated drilling tool weight, effectively reduces moment of torsion, and stability of rotation makes the risk of drill rod breaking drop to minimum.In addition, hard-metal insert cutting fractured rock on conical hob cone front end face, reach the purpose of reaming in rock, hard-metal insert on cylindrical section is the bulky grain rock slag under broken cutting in rolling process, facilitate mud to carry, realized the combination function of reamer rock cutting, righting and detritus.
In sum, the present invention has effectively avoided adding the centralizer of assembly set by to the improvement of hob-cutter structure and the layout of position on reamer, alleviated instrument weight, has reduced driving torque, has reduced cost, has strengthened the application life of instrument; In addition, hobboing cutter clamps or is threaded between front correcting and rear correcting, has facilitated the dismounting of hobboing cutter.
Description of drawings
Fig. 1 is the structural representation of the first embodiment of rock reamer of the present invention;
Fig. 2 is the structural representation of cylindricality hobboing cutter in Fig. 1;
Fig. 3 is the structural representation of the second embodiment of rock reamer of the present invention;
Fig. 4 is the structural representation of conical hob in Fig. 3.
The specific embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:
Set forth in the following description a lot of details so that fully understand the present invention, still, the present invention can also adopt other to be different from other modes described here and implement, and therefore, the present invention is not limited to the restriction of following public specific embodiment.
Illustrated in figures 1 and 2 is one embodiment of the present of invention.As shown in the figure, this reamer comprises central axis 1, front correcting 2, rear correcting 3 and the cylindricality hobboing cutter 5 of the hollow that two ends are communicated with drilling rod.Described central axis 1 circumferencial direction is provided with at least three described front correctings 2 and at least three described rear correctings 3 and three described front correctings 2 and the circumferential uniform setting of rear correcting 3, at least be provided with three cylindricality hobboing cutters 5 and three circumferential uniform settings of cylindricality hobboing cutter 5 between described front correcting 2 and rear correcting 3, the central axis of this cylindricality hobboing cutter 5 and central axis 1 be arranged in parallel.
The axle that described cylindricality hobboing cutter 5 comprises shell and is arranged on the shell middle part, also be provided with bearing (not shown) and sealing device (not shown) between shell and axle, described shell can rotate relative to its axle, described cylindricality hobboing cutter 5 shells comprise cylindrical section and are formed on the front end face of this cylindrical section front end, be evenly equipped with the hard-metal insert 4 for fractured rock on the outer peripheral face of described front end face and cylindrical section, described front end face is outwardly sphere.Hard-metal insert 4 on front end face cuts fractured rocks, reaches the purpose of reaming in rock, and the hard-metal insert 4 on cylindrical section is the bulky grain rock slag under broken cutting in rolling process, facilitates mud to carry.Simultaneously, the cylindrical section of cylindricality hobboing cutter 5 plays the effect of roller centralizer, does not need other supporting centralizer, has greatly alleviated drilling tool weight, effectively reduces moment of torsion, and stability of rotation makes the risk of drill rod breaking drop to minimum.
described front correcting 2 rear portions are provided with coils 13 on one, described rear correcting 3 front portions are provided with a low bottom-disc 14, on described upper dish 13, the interval of every two described front correctings 2 all is fixedly connected with a upper cutter head 7, described upper cutter head 7 middle parts are formed with circular hole on, the bottom is formed with draw-in groove on, on described low bottom-disc 14, the interval of every two described rear correctings 3 all is fixedly connected with tool rest 8, described lower tool rest 8 middle parts are formed with circular hole, the upper end is formed with a lower bayonet slot, on described, the center line of lower circular hole overlaps, on described, lower bayonet slot is the square circular groove that a side is formed with an opening.
This cylindricality hobboing cutter 5 is arranged between described upper and lower tool rest 7,8 by a location bearing pin 6, and described cylindricality hobboing cutter 5 can rotate with respect to its axle.The middle part hollow of described cylindricality hobboing cutter 5 axles, described alignment pin 6 are passed the axle of circular hole, cylindricality hobboing cutter 5 successively and the two ends of lower circular hole and this alignment pin 6 are in respectively in described upper and lower circular hole also removably fixing by fastening devices.
Preferably, the two ends of described alignment pin 6 removably are fixed in described upper and lower circular hole by a pin (not shown) respectively.
The shaft shoulder gabarit at the axle two ends of described cylindricality hobboing cutter 5 is the square circular that is complementary with upper and lower draw-in groove, and the shaft shoulder at the axle two ends of this cylindricality hobboing cutter 5 snaps in respectively in upper and lower draw-in groove and makes axle and upper and lower tool rest 7,8 circumferentially fix.
When cylindricality hobboing cutter 5 is installed, aim at the upper and lower draw-in groove opening on upper and lower tool rest 7,8 and first the cylindricality hobboing cutter put between upper and lower tool rest 7,8 along opening, again alignment pin 6 is inserted in the axle and lower circular hole of upper circular hole, cylindricality hobboing cutter 5, alignment pin 6 two ends are fixed in described upper and lower circular hole by a pin (not shown) respectively, and cylindricality hobboing cutter 5 namely installs; When unloading cylindricality hobboing cutter 5, first pin is extracted, then taken out successively alignment pin 6 and cylindricality hobboing cutter 5 gets final product.
By loading and unloading alignment pin 6, can change easily the cylindricality hobboing cutter; Alignment pin 6 and upper and lower tool rest 7,8 dismountable fixing, the shaft shoulder and the upper and lower tool rest 7,8 at cylindricality hobboing cutter 5 axle two ends also fix by the square circular structure, such structure Delivery Center axle stably brings the moment of torsion of cylindricality hobboing cutter, has strengthened the reliability of work.
In rock reaming work progress, rig drives drilling rod and clockwise rotates, drilling rod drives central axis 1 and clockwise rotates, cylindricality hobboing cutter 5 revolves round the sun clockwise with central axis 1, meanwhile cylindricality hobboing cutter 5 produces counterclockwise rotation under the effect of rock reaction force, and the hard-metal insert 4 on these cylindricality hobboing cutter 5 front end faces cuts fractured rocks, reaches the purpose of reaming in rock, hard-metal insert 4 on cylindrical section is the bulky grain rock slag under broken cutting in rolling process, facilitates mud to carry.
Fig. 3 and Figure 4 shows that another embodiment of the present invention.As shown in the figure, this reamer comprises central axis 1, front correcting 2, rear correcting 3 and the conical hob 9 of the hollow that two ends are communicated with drilling rod.Described central axis 1 circumferencial direction is provided with at least three described front correctings 2 and at least three described rear correctings 3 and three described front correctings 2 and the circumferential uniform setting of rear correcting 3, at least be provided with three conical hobs 9 and three circumferential uniform settings of conical hob 9 between described front correcting 2 and rear correcting 3, the central axis of this conical hob 9 and central axis 1 be arranged in parallel.
The axle that described conical hob 9 comprises shell and is arranged on the shell middle part, also be provided with bearing (not shown in FIG.) and sealing device (not shown in FIG.) between shell and axle, described shell can rotate relative to its axle, described conical hob 9 shells comprise cylindrical section and are formed on the front end face of this cylindrical section front end, be evenly equipped with the hard-metal insert 4 for fractured rock on the outer peripheral face of described front end face and cylindrical section, described front end face is the outwardly conical surface.Hard-metal insert 4 on front end face cuts fractured rocks, reaches the purpose of reaming in rock, and the hard-metal insert 4 on cylindrical section is the bulky grain rock slag under broken cutting in rolling process, facilitates mud to carry.Simultaneously, the cylindrical section of conical hob 9 plays the effect of roller centralizer, does not need other supporting centralizer, has greatly alleviated drilling tool weight, effectively reduces moment of torsion, and stability of rotation makes the risk of drill rod breaking drop to minimum.
Described conical hob 9 axle bottoms are fixedly connected with a contiguous block 10, this contiguous block 10 bottoms are fixedly connected with one or six sides 11, described contiguous block 10 is formed with screw thread for back taper and external surface, described conical hob 9 is threaded in rear correcting 3 tops by contiguous block 10, and described conical hob 9 can rotate with respect to its axle.Be reserved with the headspace that conical hob is installed between described front correcting 2 and conical hob 9, described rear correcting 3 upper ends are connected with a chassis 15, these 15 tops, chassis are welded with a base 12 that is threaded with contiguous block 10, this base 12 bottoms are provided with for the shrinkage pool of placing six sides 11, and the volume of this shrinkage pool is greater than six sides' 11 volume and can hold spanner and rotate six sides 11 in shrinkage pool.
In rock reaming work progress, rig drives drilling rod and clockwise rotates, drilling rod drives central axis 1 and clockwise rotates, conical hob 9 revolves round the sun clockwise with central axis 1, meanwhile conical hob 9 produces counterclockwise rotation under the effect of rock reaction force, and the hard-metal insert 4 on these conical hob 9 front end faces cuts fractured rocks, reaches the purpose of reaming in rock, hard-metal insert 4 on cylindrical section is the bulky grain rock slag under broken cutting in rolling process, facilitates mud to carry.
In above-mentioned two embodiment, the front end face preferred structure of described cylindricality hobboing cutter 5 is sphere, but also can be chosen as the conical surface or other have the structure of effect same; The front end face preferred structure of described conical hob 9 is the conical surface, but also can be chosen as sphere or other have the structure of effect same.
The above is only the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. rock reamer, comprise the hollow of jointed rod central axis (1), be packed in front correcting (2) and the rear correcting (3) on described central axis and be arranged on described front correcting (2) and rear correcting (3) between and hobboing cutter that can rotation, it is characterized in that: the central axis of described hobboing cutter and described central axis (1) be arranged in parallel, described hobboing cutter comprises the cylindrical section with centralizing function and is formed on the front end face of this cylindrical section front end, be evenly equipped with the hard-metal insert (4) for fractured rock on the outer peripheral face of described front end face and cylindrical section.
2. according to rock reamer claimed in claim 1, it is characterized in that: the axle that described hobboing cutter comprises shell and is arranged on the shell middle part also is provided with bearing and sealing device between shell and axle.
3. according to rock reamer claimed in claim 1, it is characterized in that: described hobboing cutter is provided with three at least at described central axis (1) circumferencial direction, and described front correcting (2) and rear correcting (3) all are provided with three at least at described central axis (1) circumferencial direction.
4. according to the described rock reamer of any one in claim 1-3, it is characterized in that: described front correcting (2) rear portion is provided with dish (13) on, described rear correcting (3) front portion is provided with a low bottom-disc (14), on described upper dish (13), the interval of every two described front correctings (2) all is fixedly connected with a upper cutter head (7), described upper cutter head (7) middle part is formed with circular hole on, the bottom is formed with draw-in groove on, on described low bottom-disc (14), the interval of every two described rear correctings (3) all is fixedly connected with tool rest (8), described lower tool rest (8) middle part is formed with circular hole, the upper end is formed with a lower bayonet slot, on described, the center line of lower circular hole overlaps, on described, lower bayonet slot is the square circular groove that a side is formed with an opening.
5. according to rock reamer claimed in claim 4, it is characterized in that: described hobboing cutter is cylindricality hobboing cutter (5), the front end face of this cylindricality hobboing cutter (5) is sphere or the conical surface, this cylindricality hobboing cutter (5) is arranged between described upper and lower tool rest (7,8) by a location bearing pin (6), and described cylindricality hobboing cutter (5) can rotate with respect to its axle.
6. according to rock reamer claimed in claim 5, it is characterized in that: the middle part hollow of described cylindricality hobboing cutter (5) axle, described alignment pin (6) is passed axle and the lower circular hole of circular hole, cylindricality hobboing cutter (5) successively, and the two ends of this alignment pin (6) are in respectively in described upper and lower circular hole also removably fixing by fastening devices.
7. according to rock reamer claimed in claim 6, it is characterized in that: the two ends of described alignment pin (6) removably are fixed in described upper and lower circular hole by a pin respectively.
8. according to rock reamer claimed in claim 7, it is characterized in that: the shaft shoulder gabarit at the axle two ends of described cylindricality hobboing cutter (5) is the square circular that is complementary with described upper and lower draw-in groove, and the shaft shoulder at the axle two ends of this cylindricality hobboing cutter (5) snaps in respectively in upper and lower draw-in groove and makes axle and upper and lower tool rest (7,8) circumferentially fix.
9. according to the described rock reamer of any one in claim 1-3, it is characterized in that: described hobboing cutter is conical hob (9), the front end face of this conical hob (9) is sphere or the conical surface, the bottom of the axle of described conical hob (9) is fixedly connected with a contiguous block (10), this contiguous block (10) bottom is fixedly connected with one or six sides (11), described contiguous block (10) is formed with screw thread for back taper and external surface, the axle of described conical hob (9) is threaded in rear correcting (3) top by contiguous block (10), described conical hob (9) can rotate with respect to its axle.
10. according to rock reamer claimed in claim 9, it is characterized in that: be reserved with the headspace that conical hob (9) is installed between described front correcting (2) and conical hob (9), described rear correcting (3) upper end is provided with a chassis (15), be fixed with a base (12) that is threaded with contiguous block (10) on this chassis (15), this base (12) bottom is provided with for the shrinkage pool of placing six sides (11), and the volume of this shrinkage pool is greater than six sides' (11) volume and can hold spanner and rotate six sides (11) in shrinkage pool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310069306.8A CN103161406B (en) | 2013-03-05 | 2013-03-05 | Rock reamer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310069306.8A CN103161406B (en) | 2013-03-05 | 2013-03-05 | Rock reamer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103161406A true CN103161406A (en) | 2013-06-19 |
| CN103161406B CN103161406B (en) | 2015-04-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310069306.8A Expired - Fee Related CN103161406B (en) | 2013-03-05 | 2013-03-05 | Rock reamer |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4254839A (en) * | 1979-06-21 | 1981-03-10 | Dresser Industries, Inc. | Radial force anti-extrusion device for sealed drill string unit |
| US4378058A (en) * | 1979-04-30 | 1983-03-29 | Smith International, Inc. | Reamer-stabilizer |
| US20060260848A1 (en) * | 2003-01-20 | 2006-11-23 | George Fyfe | Attachment means for drilling equipment |
| CN2871843Y (en) * | 2006-02-22 | 2007-02-21 | 蒙春晖 | Automatic spiral residue-extracting rotary hobbing cutter |
| CN201003382Y (en) * | 2007-02-02 | 2008-01-09 | 江西铜业集团公司 | Rotary drill stabilizer |
| US20110085877A1 (en) * | 2009-10-12 | 2011-04-14 | Atlas Copco Secoroc Llc. | Downhole tool |
| CN203145834U (en) * | 2013-03-05 | 2013-08-21 | 佟功喜 | Rock reamer |
-
2013
- 2013-03-05 CN CN201310069306.8A patent/CN103161406B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4378058A (en) * | 1979-04-30 | 1983-03-29 | Smith International, Inc. | Reamer-stabilizer |
| US4254839A (en) * | 1979-06-21 | 1981-03-10 | Dresser Industries, Inc. | Radial force anti-extrusion device for sealed drill string unit |
| US20060260848A1 (en) * | 2003-01-20 | 2006-11-23 | George Fyfe | Attachment means for drilling equipment |
| CN2871843Y (en) * | 2006-02-22 | 2007-02-21 | 蒙春晖 | Automatic spiral residue-extracting rotary hobbing cutter |
| CN201003382Y (en) * | 2007-02-02 | 2008-01-09 | 江西铜业集团公司 | Rotary drill stabilizer |
| US20110085877A1 (en) * | 2009-10-12 | 2011-04-14 | Atlas Copco Secoroc Llc. | Downhole tool |
| CN203145834U (en) * | 2013-03-05 | 2013-08-21 | 佟功喜 | Rock reamer |
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| Publication number | Publication date |
|---|---|
| CN103161406B (en) | 2015-04-15 |
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Effective date of registration: 20170822 Address after: 301714, No. two, 6 weft Road, Hexi Town, Wuqing District, Tianjin Patentee after: Tianjin Bo Zhong Zhong Drilling Tool Co., Ltd. Address before: 301714, No. two, six weft Road, Hexi Town, Wuqing District, Tianjin Patentee before: Tong Gongxi |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150415 Termination date: 20180305 |