CN204804711U - Drilling tool resistance absorber - Google Patents
Drilling tool resistance absorber Download PDFInfo
- Publication number
- CN204804711U CN204804711U CN201520438545.0U CN201520438545U CN204804711U CN 204804711 U CN204804711 U CN 204804711U CN 201520438545 U CN201520438545 U CN 201520438545U CN 204804711 U CN204804711 U CN 204804711U
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- ball
- drag reduction
- reduction device
- sheath
- boring tool
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Abstract
The utility model provides a drilling tool resistance absorber, including from top to bottom connecting in order and top connection, universal pipe, center tube and the lower clutch of inside intercommunication, spherical groove that center tube and universal union coupling department have the indent, the lower extreme of universal pipe have a spherical convex part, and spherical convex part is spacing in spherical groove and can twist reverse in spherical groove's inside. The utility model discloses a spherical convex part that sets up universal tub of lower extreme is in the spherical groove intort of center tube upper end, realizes producing the angle between center tube and the universal pipe, when the sleeve pipe has the angle in the pit, can produce between center tube and the universal pipe and sheathed tube angle assorted angle, and the messenger and the utility model discloses produce between two drilling rods connecting with sheathed tube angle assorted angle, increase the gentle degree of drilling tool, reduce and eliminate the drilling tool even because gentle degree is little and the frictional resistance who produces in tool joint between the sleeve pipe, reduce that the sheathed tube damages and the wearing and tearing of drilling tool, guarantee the life of sleeve pipe and drilling tool and bore the smooth completion of milling construction.
Description
Technical field
The utility model relates to a kind of workover tool, refers in particular to a kind of boring tool drag reduction device.
Background technology
Due to horizontal well production greatly and more and more utilize by domestic oil recovery business, and when repairing horizontal well task difficulty is larger, when focusing on horizontal well overhaul, because down-hole internal construction is comparatively complicated, simultaneously due to the effect of the gravity and pendulum force that are subject to drilling tool, and due to the flexibility of drilling tool little, and cause drilling tool frictional resistance larger, the larger frictional resistance of upper lifting force of drilling tool is larger, and this is the difficulties causing horizontal well overhaul.Usually damping device (namely connecting damping device between drilling rod) can be adopted to change the axial frictional resistance of drilling tool at present; but the circumferential frictional resistance for drilling tool and the little and frictional resistance that is that cause of the flexibility due to drilling tool still have no idea to reduce or eliminate; cause drilling tool circumferential frictional resistance consumption in abrasive drilling process large, and drilling tool is stressed larger.
Utility model content
The utility model provides a kind of flexibility that can increase drilling tool, reduces the little and boring tool drag reduction device of the frictional resistance caused of flexibility due to drilling tool.
For achieving the above object, the utility model provides a kind of boring tool drag reduction device, wherein, described boring tool drag reduction device comprises and from top to bottom connecting in turn and the top connection of inner connection, Universal pipe, central tube and lower contact, described central tube and described Universal pipe connection have the spherical groove of indent, the lower end of described Universal pipe has spherical projection, and described spherical projection is limited in described spherical groove, and described spherical projection can at described spherical groove intort.
Boring tool drag reduction device as above, wherein, the outside of described central tube and described Universal pipe connection is set with spacing sheath, the lower end of described spacing sheath is connected with the outer wall of described central tube, the upper end of described spacing sheath extends to the outside of described Universal pipe, on the upper end end face of described spherical groove by described central tube the first recessed arc-shaped concave and described spacing sheath inwall on recessed second arc-shaped concave enclose and form.
Boring tool drag reduction device as above, wherein, has gap between the part of described spacing sheath above described spherical projection and the outer wall of described Universal pipe.
Boring tool drag reduction device as above, wherein, along direction from bottom to up, the internal diameter that described spacing sheath is positioned at the part above described spherical projection becomes large gradually.
Boring tool drag reduction device as above, wherein, is provided with O-ring seal between described second arc-shaped concave and described spherical projection.
Boring tool drag reduction device as above, wherein, described boring tool drag reduction device also comprises rolling drag reduction structures, described rolling drag reduction structures comprises ball sheath and multiple ball, described ball sheath is sheathed on the outer wall of described central tube, what multiple described ball all rotated is installed on the outer wall of described ball sheath, and multiple described ball all protrudes from the outer wall of described ball sheath.
Boring tool drag reduction device as above, wherein, what the outer wall of described ball sheath was uniformly distributed circumferentially offers multiple and described ball ball installing hole one to one, and each described ball is limited in corresponding described ball installing hole and each described ball all can rotate in the described ball installing hole of correspondence.
Boring tool drag reduction device as above, wherein, the outside of described ball sheath circumferentially indent forms the ball mounting groove of at least one annular, multiple described ball is all installed in ball mounting groove described in every bar, and each described ball to be all limited in corresponding described ball mounting groove and can to rotate in the described ball mounting groove of correspondence.
Boring tool drag reduction device as above, wherein, described ball is alloying pellet.
Boring tool drag reduction device as above, wherein, be between described top connection with described Universal pipe, between described lower contact with described central tube and be threaded, and along the radial direction of described central tube, described top connection is provided with the sidewall running through described top connection and the upper stop pin nail inserted in the sidewall of described Universal pipe, and described lower contact is provided with the sidewall running through described lower contact and the lower locking pin inserted in the sidewall of described central tube.
Compared with prior art, the utility model has the following advantages:
1, the utility model is by arranging the spherical groove intort of spherical projection in central tube upper end of Universal pipe lower end, can realize producing angle between central tube and Universal pipe, when down-hole casing has angle, the angle matched with the angle of sleeve pipe can be produced between central tube and Universal pipe, thus make between two drilling rods being connected with the utility model, to produce the angle matched with the angle of sleeve pipe, increase the flexibility of drilling tool, reduce the frictional resistance even eliminated drilling tool and produce because flexibility is little and between sleeve pipe in drilling process, effectively can reduce the damage of sleeve pipe and the wearing and tearing of drilling tool, fundamentally ensure that the application life of sleeve pipe and drilling tool and ensure to bore completing smoothly of milling construction.
2, the utility model encloses formation spherical groove by the first arc-shaped concave arranging the second arc-shaped concave and central tube upper end on the inwall of spacing sheath, the split and assembling of spherical groove can be realized by the spacing sheath of dismounting and central tube, thus the installation and removal that can realize smoothly between spherical projection and spherical groove, staff can be facilitated after spherical projection weares and teares for a long time to change Universal pipe.
3, the utility model is by arranging rolling drag reduction structures, and the ball arranging rolling drag reduction structures protrudes from the outer wall of ball sheath, the boring tool drag reduction device that ball can be provided at ball sheath, the utility model and form gap between the outer wall of drilling tool and sleeve pipe, when the utility model and the friction between drilling tool and sleeve pipe can be reduced to minimum by the rolling of self to during the inwall of sleeve pipe by ball contact.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the utility model and explain, does not limit scope of the present utility model.Wherein:
Fig. 1 is the structural representation of the boring tool drag reduction device that the utility model provides;
Fig. 2 is the enlarged diagram of A place structure in Fig. 1;
Fig. 3 is another structural representation of the boring tool drag reduction device that the utility model provides.
Drawing reference numeral illustrates:
1 top connection
Stop pin nail on 11
2 Universal pipes
21 spherical projection
3 central tubes
31 spherical grooves
311 first arc-shaped concaves
312 second arc-shaped concaves
4 lower contacts
41 times locking pins
5 spacing sheaths
6 rolling drag reduction structures
61 ball sheaths
611 ball installing holes
612 ball mounting grooves
62 balls
7 O-ring seals
8 shoulders
Detailed description of the invention
In order to have clearer understanding to the technical solution of the utility model, object and effect, existing accompanying drawings detailed description of the invention of the present utility model.
As shown in Figures 1 and 3, the utility model provides a kind of boring tool drag reduction device, wherein, boring tool drag reduction device comprises and from top to bottom connecting in turn and the inner top connection 1 be communicated with, Universal pipe 2, central tube 3 and lower contact 4, when using drilling tool, the boring tool drag reduction device that the utility model provides all is installed between every two drilling rods of drilling tool, namely top connection 1 connects a drilling rod, lower contact 4 connects a drilling rod, the upper end of central tube 3 has the spherical groove 31 of indent, the lower end of Universal pipe 2 has spherical projection 21, spherical projection 21 and spherical groove 31 cooperatively interact, and spherical projection 21 can in the internal torsion of spherical groove 31.It should be noted that, spherical projection 21 is the inside being limited in spherical groove 31, spherical projection 21 cannot depart from twist process from spherical groove 31, the upper end of Universal pipe 2 is driven to tilt to different directions while spherical projection 21 reverses in spherical groove 31, make to produce angle between Universal pipe 2 and central tube 3, and produce angle between the drilling rod that is connected with lower contact 4 of drilling rod that connects of top connection 1, because the hole condition of oil well is comparatively complicated, the sleeve pipe of down-hole may have bending place, the angle of the angle between two drilling rods and sleeve pipe bending place can be effectively made to match by the boring tool drag reduction device using the utility model to provide, because drilling tool Flexibility Difference can not bend and the rigidity friction produced between sleeve pipe when effective minimizing drilling tool arrives sleeve pipe bending place in drilling process, significantly decrease the probability of drilling tool damage and casing wear, extend the application life of drilling tool and sleeve pipe and ensure to bore completing smoothly of milling construction.Wherein, the utility model can also adopt ball bearing to change to replace spherical projection 21 and spherical groove 31 to the angle realized between Universal pipe 2 and central tube 3, adopts ball bearing to have the advantage be convenient for changing after long-time use wearing and tearing simultaneously.
Further, as shown in FIG. 1 to 3, the boring tool drag reduction device that the utility model provides, wherein, boring tool drag reduction device also comprises spacing sheath 5, spacing sheath 5 is sheathed on central tube 3 and Universal pipe 2 connection, the lower end of spacing sheath 5 is connected with the outer wall of central tube 3, the upper end of spacing sheath 5 extends to the outside of Universal pipe 2, recessed formation first arc-shaped concave 311 on the upper end end face of central tube 3, recessedly on the inwall of spacing sheath 5 be formed with the second arc-shaped concave 312, spherical groove 31 is enclosed by the first arc-shaped concave 311 and the second arc-shaped concave 312 and forms.Wherein the lower end of spacing sheath 5 is connected with the outer wall thread of central tube 3, in the process that spacing sheath 5 and central tube 3 are assembled, rotary spacing sheath 5 makes the internal thread on spacing sheath 5 inwall and the external screw thread on central tube 3 outer wall mutually screw, screw the first arc-shaped concave 311 and the second arc-shaped concave 312 in process to move closer to, when the first arc-shaped concave 311 and the second arc-shaped concave 312 closed globulate groove 31, spacing sheath 5 cannot continue to rotate again, complete the assembling of spacing sheath 5 and central tube 3, because spherical projection 21 is limited by the first arc-shaped concave 311 and the second arc-shaped concave 312, can be understood as spherical projection 21 to be clamped by the first arc-shaped concave 311 and the second arc-shaped concave 312, it can thus be appreciated that the diameter of second arc-shaped concave 312 the top opening part is less than the diameter of spherical projection 21, so just can ensure that when being arranged in spherical groove 31 by spherical projection 21 spherical projection 21 can not depart from spherical groove 31, need Universal pipe 2 and top connection 1 to split when mounted and by spacing sheath 5 outside being enclosed within Universal pipe 2 from top to bottom, then top connection 1 is connected with Universal pipe 2, again spacing sheath 5 is connected with central tube 3, spherical projection 21 so can be realized to be arranged in spherical groove 31.
Wherein, and between the upper surface of spacing sheath 5 and the lower surface of top connection 1, there is gap, thus the moment of torsion transmission be conducive between Universal pipe 2 (and top connection 1) and central tube 3, prevent from producing between spacing sheath 5 and top connection 1 in Universal pipe 2 swing process rubbing simultaneously.In a few thing situation and job requirements, gap location between the upper surface of spacing sheath 5 and the lower surface of top connection 1 forms rectangle Plug Division, rectangle Plug Division comprises protuberance and recess, namely downward projection protuberance on the end face that top connection 1 is relative with spacing sheath 5, simultaneously corresponding with protuberance on the spacing sheath 5 recessed recess in position, protuberance can insert in recess and cooperatively interact with recess, so can ensure that the swaying direction of Universal pipe 2 is limited in a plane, make Universal pipe 2 and central tube 3 can only produce angle in a plane.Wherein, protuberance and the position set by recess can exchange, namely protuberance to be arranged on spacing sheath 5 and recess is arranged in top connection 1, and the shape of protuberance and recess is not limited only to rectangle, wedge shape can also be set to, trapezoidal etc. can realizes other shapes that Universal pipe 2 and central tube 3 can only produce this function of angle in a plane.
Further, as shown in Figures 1 and 3, the boring tool drag reduction device that the utility model provides, wherein, has gap between the part of spacing sheath 5 above spherical projection 21 and the outer wall of Universal pipe 2.In the process that spherical projection 21 reverses in spherical groove 31, for ensureing that the upper end of Universal pipe 2 has enough spaces to swing, need to arrange gap between the part of spacing sheath 5 above spherical projection 21 and the outer wall of Universal pipe 2, angle the angle affected between Universal pipe 2 and central tube 3 that Universal pipe 2 swings in the process so swung at Universal pipe 2, can not be limited due to spacing sheath 5.
As preferably, as shown in Figures 1 and 3, the boring tool drag reduction device that the utility model provides, wherein, along direction from bottom to up, the internal diameter that spacing sheath 5 is positioned at the part above spherical projection 21 becomes large gradually.The internal diameter of the part be positioned at above spherical projection 21 by spacing sheath 5 is set to the shape expanded gradually from the bottom to top, both the internal diameter of the second arc-shaped concave 312 topmost opening part can have been ensured enough little and spherical projection 21 can be limited in the inside of spherical groove 31, larger activity space can also be provided for Universal pipe 2 simultaneously, thus the scope that the angle between expansion Universal pipe 2 and central tube 3 changes.
As preferably, as shown in FIG. 1 to 3, the boring tool drag reduction device that the utility model provides, wherein, is provided with O-ring seal 7 between the second arc-shaped concave 312 and spherical projection 21.By arranging O-ring seal 7 between the second arc-shaped concave 312 and spherical projection 21, can effectively prevent the liquid in sleeve pipe from entering the gap between spherical groove 31 and spherical projection 21 from the gap between Universal pipe 2 and spacing sheath 5 and entering the inside of central tube 3.
Further, as shown in Figures 1 and 3, the boring tool drag reduction device that the utility model provides, wherein, boring tool drag reduction device also comprises rolling drag reduction structures 6, and rolling drag reduction structures 6 comprises ball sheath 61 and multiple ball 62, and ball sheath 61 is sheathed on the outer wall of central tube 3, on the outer wall being installed in ball sheath 61 that multiple ball 62 all rotates, and multiple ball 62 all protrudes from the outer wall of ball sheath 61.Ball 62 protrudes from boring tool drag reduction device that the outer wall of ball sheath 61 can provide at the utility model and forms space between the drilling tool connected and sleeve pipe, namely when the boring tool drag reduction device that the utility model provides and the drilling tool that connects are when the inwall of sleeve pipe, only have ball 62 can with the contact internal walls of sleeve pipe, and to be rubbed from reducing boring tool drag reduction device and the drilling tool connected that the utility model provides and the axial rub that sleeve pipe likely occurs and circumference to the full extent by the rotation of ball 62 in moving process.
Further, as shown in Figure 1, the boring tool drag reduction device that the utility model provides, wherein, on the outer wall of ball sheath 61 equally distributed offer multiple with ball 62 ball installing hole 611 one to one, in what each ball 62 all limited be installed on corresponding ball installing hole 611 and each ball 62 all can rotate in the ball installing hole 611 of correspondence, namely multiple ball 62 be all limited in the inside of ball installing hole 611 also can at the roll inside of ball installing hole 611.In order to ball 62 is limited in ball installing hole 611, stopper section can be extended to form along the radial direction of ball installing hole 611 in ball installing hole 611 at the intersection of ball installing hole 611 and the external surface of ball sheath 61, it should be noted that the internal diameter of stopper section must can ensure that ball 62 can protrude from ball sheath 61 and ball 62 can not drop out from ball installing hole 611.Ball 62 is evenly distributed on the outer wall of ball sheath 61, no matter the boring tool drag reduction device that the utility model can be made to provide and the drilling tool connected can both have the stop of ball 62 from which direction near sleeve pipe and directly cannot contact with sleeve pipe, and the boring tool drag reduction device effectively preventing the utility model from providing and the drilling tool connected are worn.
Further, as shown in Figure 3, the boring tool drag reduction device that the utility model provides, wherein, the outside of described ball sheath 61 circumferentially indent forms the ball mounting groove 612 of at least one annular, all limit in ball mounting groove 612 described in every bar multiple described ball 62 is installed and each ball 62 all can rotate in the described ball mounting groove 612 of correspondence, namely multiple ball 62 be all limited in ball mounting groove 612 inside and can at the roll inside of ball mounting groove 612.In order to ball 62 is limited in ball mounting groove 612, axially stopper section can be extended to form respectively in ball mounting groove 612 along ball sheath 61 at the intersection of the external surface of ball mounting groove about 612 both sides and ball sheath 61, minimum range between the stopper section that it should be noted that ball mounting groove about 612 both sides must can ensure that ball 62 can protrude from ball sheath 61 and ball 62 can not drop out from ball mounting groove 612.By arranging the ball mounting groove 612 of annular and install multiple ball 62 on the outer wall of ball sheath 61 in ball mounting groove 612, no matter the boring tool drag reduction device that the utility model can be made to provide and the drilling tool connected can both have the stop of ball 62 from which direction near sleeve pipe and directly cannot contact with sleeve pipe.
As preferably, ball mounting groove 612 is provided with two, effectively can limit the width in boring tool drag reduction device that the utility model provides and the gap between the drilling tool connected and the inwall of sleeve pipe, thus the boring tool drag reduction device that can provide at the utility model better and the outside of drilling tool that connects form stable annular gap.
It should be noted that, rolling drag reduction structures 6 not only comprises two kinds of forms as above, spiral ball 62 can also be put in the outer wall pressed on ring winding of ball sheath 61 and passage is installed, at ball 62, the multiple ball 62 that can rotate of the installing limited in passage is installed.
As preferably, as shown in Figures 1 and 3, the boring tool drag reduction device that the utility model provides radially is convexly equipped with shoulder 8 on the outer wall of central tube 3, the upper end of ball sheath 61 is resisted against on the lower surface of shoulder 8, and the upper end of ball sheath 61 is resisted against on the upper surface of lower contact 4, be resisted against on the upper surface of shoulder 8 after the lower end of spacing sheath 5 is connected with the outer wall thread of central tube 3.Can better ball sheath 61 and spacing sheath 5 be limited in certain scope by arranging shoulder 8, especially can prevent ball sheath 61 moving axially along central tube 3 in operation process.
As preferably, the boring tool drag reduction device that the utility model provides, wherein, ball 62 is alloying pellet.Alloying pellet has extraordinary corrosion resistance and abrasion resistance, fundamentally can ensure the application life of the boring tool drag reduction device that the utility model provides.
As preferably, as shown in Figures 1 and 3, the boring tool drag reduction device that the utility model provides, wherein, be between top connection 1 with Universal pipe 2, between lower contact 4 with central tube 3 and be threaded, and the radial direction of centrally pipe 3, top connection 1 is provided with the sidewall running through top connection 1 and the upper stop pin nail 11 inserted in the sidewall of Universal pipe 2, and lower contact 4 is provided with the sidewall running through lower contact 4 and the lower locking pin 41 inserted in the sidewall of central tube 3.Lock for being threaded and following closely 11 by upper stop pin with the upper end of Universal pipe 2 by arranging top connection 1, the lower end of lower contact 4 and central tube 3 is for being threaded and being locked by lower locking pin 41, the bonding strength between top connection 1 and Universal pipe 2, between lower contact 4 and central tube 3 can be improved, can ensure the utility model stability in use, each parts of the boring tool drag reduction device that the utility model is provided can not loosen owing to being subject to external force.
The boring tool drag reduction device that the utility model provides in use, a drilling rod is respectively connected with lower contact 4 place in top connection 1, when drilling tool enter down-hole carry out creeping into operation time, run into bending place and need to change direction part, spherical groove 31 between Universal pipe 2 and central tube 3 and spherical projection 21 twist, produce certain angle between Universal pipe 2 with central tube 3 until this angle and sleeve pipe bending place or need the angle changing direction part consistent, thus increase the flexibility of drilling tool, reduce the boring tool drag reduction device that the utility model provides and the rigidity friction produced because flexibility is inadequate between the drilling tool connected and sleeve pipe, under the cooperation of rolling drag reduction structures 6, reduce boring tool drag reduction device and the drilling tool connected and sleeve pipe that the utility model provides at axial and circumferential frictional resistance simultaneously.The boring tool drag reduction device that the utility model provides simultaneously can also realize the conveying of workover fluid, when needs bore mill, circulation workover fluid is squeezed into from drilling rod inside, the boring tool drag reduction device that workover fluid provides through drilling rod and the utility model returns out from the brill grinder tool bottom drilling rod, turn back to ground and the heat cooling will produced when working bottom drilling tool through the annular space between drilling tool and sleeve pipe, can also iron filings to be processed and landwaste etc. be needed to take ground out of shaft bottom simultaneously.
Compared with prior art, the utility model has the following advantages:
1, the utility model is by arranging the spherical groove intort of spherical projection in central tube upper end of Universal pipe lower end, can realize producing angle between central tube and Universal pipe, when down-hole casing has angle, the angle matched with the angle of sleeve pipe can be produced between central tube and Universal pipe, thus make between two drilling rods being connected with the utility model, to produce the angle matched with the angle of sleeve pipe, increase the flexibility of drilling tool, reduce the frictional resistance even eliminated drilling tool and produce because flexibility is little and between sleeve pipe in drilling process, effectively can reduce the damage of sleeve pipe and the wearing and tearing of drilling tool, fundamentally ensure that the application life of sleeve pipe and drilling tool and ensure to bore completing smoothly of milling construction.
2, the utility model encloses formation spherical groove by the first arc-shaped concave arranging the second arc-shaped concave and central tube upper end on the inwall of spacing sheath, the split and assembling of spherical groove can be realized by the spacing sheath of dismounting and central tube, thus the installation and removal that can realize smoothly between spherical projection and spherical groove, staff can be facilitated after spherical projection weares and teares for a long time to change Universal pipe.
3, the utility model is by arranging rolling drag reduction structures, and the ball arranging rolling drag reduction structures protrudes from the outer wall of ball sheath, the boring tool drag reduction device that ball can be provided at ball sheath, the utility model and form gap between the outer wall of drilling tool and sleeve pipe, when the utility model and the friction between drilling tool and sleeve pipe can be reduced to minimum by the rolling of self to during the inwall of sleeve pipe by ball contact.
The foregoing is only the schematic detailed description of the invention of the utility model, and be not used to limit scope of the present utility model.Any those of ordinary skill in the art, equivalent variations done under the prerequisite not departing from design of the present utility model and principle and amendment, all should belong to the scope of the utility model protection.
Claims (10)
1. a boring tool drag reduction device, it is characterized in that, described boring tool drag reduction device comprises and from top to bottom connecting in turn and the top connection of inner connection, Universal pipe, central tube and lower contact, described central tube and described Universal pipe connection have the spherical groove of indent, the lower end of described Universal pipe has spherical projection, described spherical projection is limited in described spherical groove, and described spherical projection can at described spherical groove intort.
2. boring tool drag reduction device according to claim 1, it is characterized in that, the outside of described central tube and described Universal pipe connection is set with spacing sheath, the lower end of described spacing sheath is connected with the outer wall of described central tube, the upper end of described spacing sheath extends to the outside of described Universal pipe, on the upper end end face of described spherical groove by described central tube the first recessed arc-shaped concave and described spacing sheath inwall on recessed second arc-shaped concave enclose and form.
3. boring tool drag reduction device according to claim 2, is characterized in that, has gap between the part of described spacing sheath above described spherical projection and the outer wall of described Universal pipe.
4. boring tool drag reduction device according to claim 3, is characterized in that, along direction from bottom to up, the internal diameter that described spacing sheath is positioned at the part above described spherical projection becomes large gradually.
5. the boring tool drag reduction device according to any one of claim 2 ~ 4, is characterized in that, is provided with O-ring seal between described second arc-shaped concave and described spherical projection.
6. boring tool drag reduction device according to claim 1, it is characterized in that, described boring tool drag reduction device also comprises rolling drag reduction structures, described rolling drag reduction structures comprises ball sheath and multiple ball, described ball sheath is sheathed on the outer wall of described central tube, what multiple described ball all rotated is installed on the outer wall of described ball sheath, and multiple described ball all protrudes from the outer wall of described ball sheath.
7. boring tool drag reduction device according to claim 6, it is characterized in that, what the outer wall of described ball sheath was uniformly distributed circumferentially offers multiple and described ball ball installing hole one to one, and each described ball is limited in corresponding described ball installing hole and each described ball all can rotate in the described ball installing hole of correspondence.
8. boring tool drag reduction device according to claim 6, it is characterized in that, the outside of described ball sheath circumferentially indent forms the ball mounting groove of at least one annular, multiple described ball is all installed in ball mounting groove described in every bar, and each described ball to be all limited in corresponding described ball mounting groove and can to rotate in the described ball mounting groove of correspondence.
9. the boring tool drag reduction device according to any one of claim 6 ~ 8, is characterized in that, described ball is alloying pellet.
10. boring tool drag reduction device according to claim 1, it is characterized in that, be between described top connection with described Universal pipe, between described lower contact with described central tube and be threaded, and along the radial direction of described central tube, described top connection is provided with the sidewall running through described top connection and the upper stop pin nail inserted in the sidewall of described Universal pipe, and described lower contact is provided with the sidewall running through described lower contact and the lower locking pin inserted in the sidewall of described central tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520438545.0U CN204804711U (en) | 2015-06-24 | 2015-06-24 | Drilling tool resistance absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520438545.0U CN204804711U (en) | 2015-06-24 | 2015-06-24 | Drilling tool resistance absorber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204804711U true CN204804711U (en) | 2015-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520438545.0U Active CN204804711U (en) | 2015-06-24 | 2015-06-24 | Drilling tool resistance absorber |
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| CN (1) | CN204804711U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108362869A (en) * | 2018-04-24 | 2018-08-03 | 福州迈新生物技术开发有限公司 | A kind of incubation box |
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2015
- 2015-06-24 CN CN201520438545.0U patent/CN204804711U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108362869A (en) * | 2018-04-24 | 2018-08-03 | 福州迈新生物技术开发有限公司 | A kind of incubation box |
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