CN108894732A - Double-wall drill pipe - Google Patents
Double-wall drill pipe Download PDFInfo
- Publication number
- CN108894732A CN108894732A CN201811106495.0A CN201811106495A CN108894732A CN 108894732 A CN108894732 A CN 108894732A CN 201811106495 A CN201811106495 A CN 201811106495A CN 108894732 A CN108894732 A CN 108894732A
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- China
- Prior art keywords
- wall
- short circuit
- double
- circular bead
- shorted
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Classifications
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- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- General Engineering & Computer Science (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of double-wall drill pipes, including the upper short circuit, outer tube and lower short circuit being successively threadedly coupled from top to bottom, and the inner tube being arranged in outer tube hub duct；Upper short circuit and lower short circuit are provided in the axial direction with central duct and eccentric duct, inner tube is sleeved on the double-wall pipe for being formed in outer tube and having central duct and annulus in the form of there are gap, and both ends are separately fixed on the hole wall of the central duct of short circuit and lower short circuit, the central duct of the central duct and inner tube that make short circuit and lower short circuit, which is interconnected, forms the first mistake liquid channel, and the eccentric duct of the two then with it is interior, the annulus formed between outer tube wall, which is interconnected, forms the second mistake liquid channel, shoulder sealing is formed between two components being threadedly coupled simultaneously, penetrate through the first liquid channel excessively mutually not with the second liquid channel excessively；The double-wall drill pipe effectively prevent inner tube to move up and down in use, while seal and pressure bearing ability and reliability between the longer inner and outer pipe of length greatly improved.
Description
Technical field
The present invention relates to drilling applications technical field, in particular to a kind of double-wall drill pipe.
Background technique
Double-wall drill pipe boring method refers to the method for carrying out drilling well using double-wall drill pipe and other ancillary equipments, mainly includes
Low-pressure drilling, central sampling drilling, RDM technology and double-walled air-filling well-drilling etc..This method is led in Geological And Mineral Resources Departments In Their and oil drilling
Domain is constantly taken seriously and promotes and applies.
Currently, the common double-wall drill pipe of double-wall drill pipe boring method is made of inner and outer tubes, inner tube is mounted in outer tube
It is annular space and internal tube duct between inner and outer pipes respectively to form two runners；It is connected through a screw thread between outer tube, it is interior
Connection is realized by grafting radial seal structure between pipe and prevents the fluid communication between two channels.However, this structure
Double-wall drill pipe have the following problems：1. inside and outside drilling rod is longer, for length up to 10m or so, inner and outer tubes concentricity is difficult
To guarantee, gap is excessive between the pin end and female connector for causing inner tube grafting to seal, and seal under high pressures circle is easy to be squeezed into public affairs
Assembly sealing ring injures in connector and female connector gap, reduces seal and pressure bearing ability and reliability；2. drilling rod has often dismounted
It may cause sealing ring curling and squeeze wound, reduce seal and pressure bearing ability and reliability；3. interior since space limits between inner and outer pipes
Pipe also needs to be suspended in outer tube upper step, since step surface is small and double-wall drill pipe is vibrated up and down using inner tube during being somebody's turn to do and held very much
Suspension step failure is easily led to, inner and outer pipes misplace up and down；The up-down vibration of inner tube also will be greatly reduced sealing ring service life.It is close
Seal failure will will lead to the failure of double-wall drill pipe boring method, seriously hinder the popularization and application of double-wall drill pipe drilling technology.
Therefore, it is necessary to key equipment, i.e. double-wall drill pipe sealing life and reliability in double-wall drill pipe boring method be promoted really, thus
The development of double-wall drill pipe drilling technology can further be pushed.
Summary of the invention
Seal and pressure bearing ability between inner and outer tubes can be effectively increased the object of the present invention is to provide one kind and can
By the double-wall drill pipe of property.
For this purpose, technical solution of the present invention is as follows：
A kind of double-wall drill pipe, including sequentially connected upper short circuit, outer tube and lower short circuit from top to bottom, and it is sleeved on outer tube
Inner tube in central duct；Wherein,
The upper top inner wall that is shorted is equipped with for connecting the lower internal screw thread for being shorted bottom end, bottom end outer wall equipped with for connecting
The external screw thread on outer tube top, and offer central duct A and bias duct A respectively along axial direction on upper short circuit；The bottom central duct B
Stomidium wall invagination is formed with first annular step；
Outer tube top inner wall is equipped with for connecting the upper internal screw thread for being shorted bottom end, bottom end outer wall is equipped under connection
It is shorted the external screw thread on top；
The lower top inner wall that is shorted is equipped with equipped with internal screw thread, the bottom end outer wall for connecting outer tube bottom end for connecting
It is shorted the external screw thread on top, and offers central duct C and bias duct B respectively along axial direction on lower short circuit；The top central duct C
Stomidium wall invagination is formed with the second ring-shaped step；
Inner tube is sleeved on the double-wall pipe for being formed in outer tube and having central duct B and annulus A in the form of there are gap；
The top of inner tube is inserted into the central duct A of short circuit and its top surface is against on the lower end surface of first annular step, inner tube
Bottom end is inserted into the central duct C of lower short circuit and its bottom surface is against on the upper surface of the second ring-shaped step, make central duct A,
Central duct B forms first be connected to central duct C and crosses liquid channel, and eccentric duct A, annulus A and bias duct B are formed
The second of connection crosses liquid channel.
Wherein, outer tube then preferably uses aluminium-alloy pipe using conventional single wall drilling rod, inner tube, in the intensity for guaranteeing double-wall drill pipe
Effectively mitigate whole weight while demand.
It is preferred that upper be shorted is made of the interior short circuit that outer short circuit and setting are shorted in central duct outside；Wherein, outer short circuit top
End inner wall is equipped with for connecting the lower internal screw thread for being shorted bottom end, bottom end outer wall equipped with the outer spiral shell for connecting outer tube top
Line；Offer central duct A and bias duct A on interior short circuit respectively along axial direction；
Interior short circuit and outer short circuit are integrally machined molding；Or, being welded and fixed between interior short circuit and outer short circuit or by fastening spiral shell
The connection fixtures such as nail are fixed as one；Or, interior short circuit top outer wall is equipped with annular flange, and corresponding in the case where being located at internal screw thread
The outer short circuit inner wall of side is equipped with thrust step, is mounted on interior short circuit on the thrust step of outer short circuit by annular flange, keeps away
Exempt from interior short circuit relative to outer short circuit downlink.
It is preferred that being equipped with sealing element A, outer wall and center in inner tube between the outer wall of inner tube and the hole wall of central duct A
Sealing element B is equipped between the hole wall of duct C.
Wherein, sealing element A13 and sealing element B53 is at least one sealing being arranged between outer wall of inner tube and corresponding hole wall
Circle or at least one sealing ring and on the upside of each sealing ring and/or the backup ring of downside.At neighbouring sealing ring also
It can choose and be provided at least one guide ring, to reduce seal eccentric extruding.
It is preferred that being equipped with annular shoulder above the external screw thread of lower short circuit, and the top of the circular bead surface C of annular shoulder and upper short circuit
End face processes the annular shoulder face A to be formed and fits closely to form shoulder sealing, is formed with annular table below the internal screw thread of upper short circuit
Shoulder, and the bottom end end face of the circular bead surface B of annular shoulder and lower short circuit processes the annular shoulder face D to be formed and fits closely to form shoulder
Sealing makes after two double-wall drill pipes are threadedly coupled fixed, and the first of two double-wall drill pipes crosses liquid channel and be interconnected, and two double
Wall drilling rod second cross liquid channel be interconnected, and be connected to first cross liquid channel be connected to second cross liquid channel between pass through
The shoulder sealing formed between circular bead surface B and circular bead surface D does not penetrate through mutually.
It is preferred that offering the ring-shaped groove for being provided with sealing element C on circular bead surface B or circular bead surface D, make circular bead surface B and platform
Sealing is formed by sealing element C between the D of shoulder face.
It is preferred that circular bead surface B and circular bead surface D are processed as the mutually matched conical surface, and opened up on circular bead surface B or circular bead surface D
There is the ring-shaped groove for being provided with sealing element C, makes to form sealing by sealing element C between circular bead surface B and circular bead surface D；
It is further preferred that the angle of taper of the circular bead surface B is equal with the angle of taper of circular bead surface D and is 90 °.
It is preferred that sealing element C is O-ring seals, rectangular seal circle or vulcanizes the combination being integrated by rubber and becket
Seal washer.
It is preferred that circular bead surface B is processed as the inner cylinder face being recessed inwardly, circular bead surface D be processed as protrusion outward and with it is interior
Mutual cooperation external cylindrical surface in cylindrical surface is provided with a U-shaped sealing ring between inner cylinder face and external cylindrical surface, makes circular bead surface B
Sealing is formed by U-shaped sealing ring between circular bead surface D.
It is preferred that being provided at least one centralizer for being arranged concentrically inner and outer tubes between the inner and outer pipe sections, and help
The a plurality of liquid channel excessively being along the circumferential direction distributed is being offered on positive device outer wall.
Compared with prior art, the beneficial effect of the double-wall drill pipe：
1) be shorted on and the setting of lower short circuit effectively prevent inner tube to move up and down in use, and improve inner tube and
The precision and quality that outer tube assembles indoors is tightly connected inner tube and outer tube, without disassembly on well, and then greatly improved
Seal and pressure bearing ability and reliability between the longer inner and outer tubes of length；
2) it is shorted on and the size of lower short circuit is shorter, be conducive to the machining accuracy for improving the two, and then keep the two connection solid
Sealed pressure grade and reliability after fixed are further enhanced；
3) it when two double-wall drill pipes connect, is shorted between lower short circuit thereon using in mutually matched plane circular bead surface
Or sealing element is set on mutually matched conical surface circular bead surface, it solves sealing element and distorts, falls off and partially caused by dismantling repeatedly
The problem of heart, improves the service life of sealing element.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the double-wall drill pipe of the embodiment of the present invention 1；
Fig. 2 is that the upper short circuit of two double-wall drill pipes of the embodiment of the present invention 1 and the lower structure for being shorted threaded connection state are shown
It is intended to；
Fig. 3 is that the upper short circuit of two double-wall drill pipes of the embodiment of the present invention 2 and the lower structure for being shorted threaded connection state are shown
It is intended to；
Fig. 4 is that the upper short circuit of two double-wall drill pipes of the embodiment of the present invention 3 and the lower structure for being shorted threaded connection state are shown
It is intended to；
Fig. 5 is that the upper short circuit of two double-wall drill pipes of the embodiment of the present invention 4 and the lower structure for being shorted threaded connection state are shown
It is intended to；
Fig. 6 is that the upper short circuit of two double-wall drill pipes of the embodiment of the present invention 5 and the lower structure for being shorted threaded connection state are shown
It is intended to；
Fig. 7 is the partial enlargement diagram of Fig. 1；
Fig. 8 is the structural schematic diagram of the double-walled of the embodiment of the present invention 6.
It in figure, is shorted on 1., 2. outer tubes, 3. inner tubes, 4. centralizers, 5. lower short circuits, 10. circular bead surface B, 11. eccentric ducts
A, 12. central duct A, 13. sealing element A, 14. circular bead surface A, 15. interior short circuits, 16. are shorted outside, 17. thrust steps, 20. annulars
Duct A, 30. central duct B, 40. cross liquid channel C, and 50. circular bead surface D, 51. bias duct B, 52. central duct C, 53. seal
Part B, 54. circular bead surface C, 60. sealing element C, 1301.O type rubber rings, 1302.O type backup ring, 1303. guide rings.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is described further, but following embodiments are absolutely not to this hair
It is bright to have any restrictions.
Embodiment 1
As shown in Figure 1, the double-wall drill pipe includes sequentially connected upper short circuit 1, outer tube 2 and lower short circuit 5 from top to bottom, and
The inner tube 3 being sleeved in 2 central duct of outer tube；Wherein,
It is upper to be shorted 1 as column construction, the internal screw thread concentric with its external cylindrical surface, bottom end outer wall are machined on the inner wall of top
On be machined with the external screw thread concentric with its external cylindrical surface, and offered respectively in axial direction from the end face being located at below the internal screw thread
The central duct A12 and bias duct A11 of lower perforation；
Outer tube 2 is conventional single wall drilling rod, and internal screw thread is machined on the inner wall of top, is machined with external screw thread on the outer wall of bottom end；
The external screw thread processed on 1 bottom end outer wall of the internal screw thread processed on 2 top inner wall of outer tube and upper short circuit cooperates, make outer tube 2 with
Upper be shorted between 1 is threadedly coupled fixation；
It is lower to be shorted 5 as column construction, the internal screw thread concentric with its external cylindrical surface, bottom end outer wall are machined on the inner wall of top
On be machined with the external screw thread concentric with its external cylindrical surface, and from being located at the center side Chu Jilin of end face below internal screw thread edge respectively
Axially offer central duct C52 and bias duct B51 up and down；The lower internal screw thread for being shorted the processing of 5 tops and 2 bottom of outer tube
The external screw thread of end processing cooperates, and outer tube 2 is made to be threadedly coupled fixation with lower be shorted between 5；
Inner tube 3 be aluminium-alloy pipe, be sleeved in the form of there are gap in outer tube 2 formed have central duct B30 and
The double-wall pipe of annulus A20；Simultaneously by being set with and being fixed on two centralizers 4 of 3 outer wall upper and lower part of inner tube,
It is arranged concentrically inner tube 3 with outer tube 2；A plurality of along the circumferential direction uniformly distributed liquid channel 40 excessively is offered on the outer wall of centralizer 4, is made
The liquid flowing at centralizer 4 passed through liquid channel 40 and continued to flow in the annulus space of lower section；
Central duct A12 bottom end hole wall invagination is formed with first annular step, and the top central duct C52 hole wall invaginates to be formed
Have the second ring-shaped step, make the top of inner tube 3 be inserted into be shorted 1 central duct A12 in and its top surface be against it is first annular
On the lower end surface of step, the bottom end of inner tube 3 is inserted into the central duct C52 of lower short circuit 5 and its bottom surface is against the second annular table
On the upper surface of rank, at this point, central duct A12, central duct B30, which form first be connected to central duct C52, crosses liquid channel,
Eccentric duct A11, annulus A20 form second be connected to bias duct B51 and cross liquid channel；To guarantee that first crosses liquid channel
And second cross liquid channel between have good seal pack, set between the outer wall of inner tube 2 and the hole wall of central duct A12
There is sealing element A13, sealing element B53 is equipped between the outer wall of inner tube 2 and the hole wall of central duct C52, specifically, such as Fig. 7 institute
Show, sealing element A13 includes two O-shaped rubber rings, 1301, four O-ring seal retaining rings 1302 and a guide ring 1303；Wherein,
It is spaced apart from top to bottom on the hole wall of the central duct A12 contacted with 2 outer wall of inner tube and the hole wall of central duct C52 and is equipped with three
A annular groove is equipped with guide ring 1303 being located in the middle in annular groove, and is each provided in the annular groove for being located at two sides
One O-shaped rubber ring 1301, and one is each provided at the two sides cell wall of each O-shaped rubber ring 1301 in annular groove
Backup ring 1302；The composition of sealing element B53 and set-up mode and the composition of above-mentioned sealing element A13 are consistent with set-up mode.
The double-wall drill pipe needed before use according to hole condition by more identical double-wall drill pipes head and the tail be sequentially connected for length with
The adaptable tubing string of hole condition.Stability and leakproofness to guarantee the tubing string formed after more double-wall drill pipe connections is good, such as Fig. 2
Shown, the upper external screw thread processed on 5 bottom end outer walls of the internal screw thread processed on 1 top inner wall and lower short circuit that is shorted cooperates, and makes
It is connected through a screw thread fixation between the lower short circuit 5 of a upper double-wall drill pipe and the upper short circuit 1 of next double-wall drill pipe, meanwhile, it should
Upper be shorted between 1 and lower short circuit 5 forms shoulder sealing, makes the first of be connected two double-wall drill pipes to cross liquid channel and mutually interconnects
It is logical, the second of two double-wall drill pipes being connected cross liquid channel is interconnected, and is connected first cross liquid channel be connected
Second cross liquid channel between do not penetrate through mutually.
Specifically, it is as follows to form shoulder sealing concrete mode：The top hole wall invagination shape of the central duct A12 of upper short circuit 1
At there is third ring-shaped step, is extended axially downward at the bottom center of lower short circuit 5 and be formed with column-shaped projection, and the column-shaped projection
Concentric with central duct C52, eccentric duct B51 is located at the adjacent side of the column-shaped projection；Outer diameter and the third annular of the column-shaped projection
Aperture above step is adapted, and is made to be shorted 1 and is threadedly coupled under stationary state with lower short circuit 5, during which is inserted into
In the A12 of heart duct and bottom end is press-fitted on the upper surface of third ring-shaped step；The upper surface of third ring-shaped step and column-shaped projection
Bottom end end face be processed as capable of fitting closely the annular shoulder face B10 and annular shoulder face D50 to form shoulder sealing respectively；Under
It is shorted the top end face equipped with annular shoulder and the circular bead surface C54 of the annular shoulder and upper short circuit 1 above 5 external screw thread and processes shape
At annular shoulder face A14 fit closely to be formed shoulder sealing；Wherein, in the present embodiment, circular bead surface B10 and circular bead surface A14
It is processed as the plane vertical with the upper short circuit axis of 1 internal screw thread, circular bead surface D50 and circular bead surface C54 are processed as being shorted 5 with lower
Externally threaded axially vertical plane.
Embodiment 2
As shown in figure 3, the structure of the double-wall drill pipe and the structure of the double-wall drill pipe of embodiment 1 are essentially identical, difference
It is：Upper be shorted between 1 circular bead surface B10 and circular bead surface D50 is provided with the adaptable sealing element with circular bead surface 50
C60 makes to form sealing by sealing element C60 between circular bead surface B10 and circular bead surface D50；Wherein, sealing element C60 is by rubber
Vulcanize the combination sealing washer being integrated with becket.
Embodiment 3
As shown in figure 4, the structure of the double-wall drill pipe and the structure of the double-wall drill pipe of embodiment 1 are essentially identical, difference
It is：End face below 1 internal screw thread of top connection be processed as with the mutually matched circular bead surface B10 of annular shoulder face D50, and
The ring-shaped groove that a section is straight-flanked ring is offered on circular bead surface B10, is provided with a rectangular seal C60 in ring-shaped groove,
Make to be formed between circular bead surface B10 and circular bead surface D50 by rectangular seal and seal；Wherein, rectangular seal is regular rubber ring.
Embodiment 4
As shown in figure 5, the structure of the double-wall drill pipe and the structure of the double-wall drill pipe of embodiment 1 are essentially identical, difference
It is：The circular bead surface B10 of upper short circuit 1 is processed as the conical surface that internal diameter is gradually reduced from top to bottom, accordingly, by lower short circuit 5
Column-shaped projection is processed as the mechanism that top outer diameter is greater than lower outer diameter, and is processed as at variable diameter mutually matched with circular bead surface B10
The conical surface forms circular bead surface D50；A ring-shaped groove is offered on circular bead surface B10, and it is close that an O shape is provided in ring-shaped groove
Seal C60 makes to form sealing by O-ring seals C60 between circular bead surface B10 and circular bead surface D50；Wherein, it is processed as conical surface knot
The corresponding institute of the circular bead surface B10 and circular bead surface D50 of structure is 90 ° at the angle of cone angle.
Embodiment 5
As shown in fig. 6, the structure of the double-wall drill pipe and the structure of the double-wall drill pipe of embodiment 1 are essentially identical, difference
It is：Circular bead surface B10 is processed as the inner cylinder face being recessed inwardly, circular bead surface D50 be processed as protrusion outward and can with it is interior
Mutual cooperation external cylindrical surface in cylindrical surface is provided with a U-shaped sealing ring C60 between inner cylinder face and external cylindrical surface, makes shoulder
Sealing is formed by U-shaped sealing ring C60 between face B10 and circular bead surface D50.
Embodiment 6
As shown in figure 8, the structure of the double-wall drill pipe and the structure of the double-wall drill pipe of embodiment 1 are essentially identical, difference
It is：It is upper be shorted 1 by it is outer be shorted 16 and interior short circuit 15 this two parts for being shorted in 16 central ducts outside of setting be composed；Its
In, outer to be shorted 16 as tube structure, top inner wall is equipped with for connecting lower internal screw thread, the bottom end outer wall for being shorted 5 bottom ends
Thrust platform is offered equipped with the external screw thread for connecting 2 top of outer tube, and on 16 inner wall of outer short circuit being located at below internal screw thread
Rank 17；Accordingly, the top outer wall for being shorted 15 inside is equipped with annular flange, is mounted on interior short circuit 15 by annular flange outer
It is shorted on 16 thrust step 17；Inside be shorted 15 be cylindrical structure, offered respectively along axial direction thereon central duct A12 and
Eccentric duct A11.
For double-wall drill pipe described in above-described embodiment 6, outer short circuit 16 therein can also be processed as one with outer tube 2
Formula structure.
When being lifted to the double-wall drill pipe, transporting and being put vertically immediately, thread protector is installed in the lower end of lower short circuit 5, with
It prevents from damaging the lower external screw thread for being shorted 5 and other mating surfaces.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (10)
1. a kind of double-wall drill pipe, which is characterized in that including sequentially connected upper short circuit (1), outer tube (2) and lower short circuit from top to bottom
And the inner tube (3) that is sleeved in outer tube (2) central duct (5),；Wherein,
Upper (1) the top inner wall that is shorted is equipped with for connecting the lower internal screw thread for being shorted (5) bottom end, bottom end outer wall equipped with for connecting
The external screw thread on outer tube (2) top is connect, and offers central duct A (12) and bias duct A respectively along axial direction on upper short circuit (1)
(11)；Central duct B (12) bottom end hole wall invagination is formed with first annular step；
Outer tube (2) top inner wall is equipped with for connecting the upper internal screw thread for being shorted (1) bottom end, bottom end outer wall is equipped with for connecting
The lower external screw thread for being shorted (5) top；
Lower (5) the top inner wall that is shorted is equipped with equipped with internal screw thread, the bottom end outer wall for connecting outer tube (2) bottom end for connecting
The upper external screw thread for being shorted (1) top, and offer central duct C (52) and bias duct B respectively along axial direction on lower short circuit (5)
(51)；Central duct C (52) top hole wall invagination is formed with the second ring-shaped step；
Inner tube (3), which is sleeved on to be formed in outer tube (2) in the form of there are gap, has central duct B (30) and annulus A
(20) double-wall pipe；The top of inner tube (3) is inserted into the central duct A (12) of short circuit (1) and its top surface is against the first ring
On the lower end surface of shape step, the bottom end of inner tube (3) is inserted into the lower central duct C (52) for being shorted (5) and its bottom surface is against the
On the upper surface of second ring step, central duct A (12), central duct B (30) and central duct C (52) is made to form the be connected to
One crosses liquid channel, and eccentric duct A (11), annulus A (20) and bias duct B (51) form second be connected to and cross liquid channel.
2. double-wall drill pipe according to claim 1, which is characterized in that upper to be shorted (1) by outer short circuit (16) and be arranged outside
The interior short circuit (15) being shorted in (16) central duct is constituted；Wherein,
Outer (16) the top inner wall that is shorted is equipped with and is used for equipped with internal screw thread, the bottom end outer wall for connecting lower short circuit (5) bottom end
Connect the external screw thread on outer tube (2) top；Offer central duct A (12) and bias duct A on interior short circuit (15) respectively along axial direction
(11)；
Interior short circuit (15) and outer short circuit (16) are integrally machined molding；Or, being welded and fixed between interior short circuit (15) and outer short circuit (16)
Or it is fixed as one by fastening screw；Or, interior short circuit (15) top outer wall is equipped with annular flange, and corresponding positioned at interior spiral shell
Outer short circuit (16) inner wall below line is equipped with thrust step (17), and interior short circuit (15) is made to be mounted on outer short circuit by annular flange
(16) on thrust step (17).
3. double-wall drill pipe according to claim 1 or 2, which is characterized in that in the outer wall and central duct A of inner tube (2)
(12) sealing element A (13) are equipped between hole wall, are equipped between the outer wall of inner tube (2) and the hole wall of central duct C (52) close
Sealing B (53).
4. double-wall drill pipe according to claim 1 or 2, which is characterized in that be equipped with annular above the lower external screw thread for being shorted (5)
Shoulder, and the circular bead surface C (54) of annular shoulder and the upper top end face for being shorted (1) process the annular shoulder face A (14) to be formed tightly
Closely connected conjunction forms shoulder sealing, is formed with annular shoulder, and the circular bead surface B of annular shoulder below the upper internal screw thread for being shorted (1)
(10) the annular shoulder face D (50) to be formed is processed with the lower bottom end end face for being shorted (5) to fit closely to form shoulder sealing, make when two
A double-wall drill pipe be threadedly coupled it is fixed after, the first of two double-wall drill pipes crosses liquid channel and is interconnected, the of two double-wall drill pipes
Two, which cross liquid channel is interconnected, and is connected to first, crosses liquid channel and second crosses between liquid channel through circular bead surface B with what is be connected to
(10) the shoulder sealing formed between circular bead surface D (50) does not penetrate through mutually.
5. double-wall drill pipe according to claim 4, which is characterized in that opened up on circular bead surface B (10) or circular bead surface D (50)
There is the ring-shaped groove for being provided with (60) sealing element C, makes between circular bead surface B (10) and circular bead surface D (50) through sealing element C (60) shape
At sealing.
6. double-wall drill pipe according to claim 4, which is characterized in that circular bead surface B (10) and circular bead surface D (50) are processed as phase
The conical surface mutually cooperated, and the ring-shaped groove for being provided with (60) sealing element C is offered on circular bead surface B (10) or circular bead surface D (50),
Make to form sealing by sealing element C (60) between circular bead surface B (10) and circular bead surface D (50).
7. double-wall drill pipe according to claim 5 or 6, which is characterized in that sealing element C (60) is O-ring seals, rectangle is close
Seal vulcanizes the combination sealing washer being integrated by rubber and becket.
8. double-wall drill pipe according to claim 6, which is characterized in that the angle of taper and shoulder of the circular bead surface B (10)
The angle of taper of face D (50) is equal, is 90 °.
9. double-wall drill pipe according to claim 4, which is characterized in that circular bead surface B (10) is processed as being recessed inwardly interior
Cylindrical surface, circular bead surface D (50) be processed as protrusion outward and with inner cylinder face mutual cooperation external cylindrical surface, in inner cylinder face and outer
It is provided with a U-shaped sealing ring between cylindrical surface, makes to be formed between circular bead surface B (10) and circular bead surface D (50) by U-shaped sealing ring
Sealing.
10. double-wall drill pipe according to claim 1, which is characterized in that be provided between inner tube (2) and outer tube (3) to
A few centralizer (4) for being arranged concentrically inner tube (2) and outer tube (3), and offered on centralizer (4) outer wall it is a plurality of circumferentially
Directional spreding crosses liquid channel (40).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811106495.0A CN108894732A (en) | 2018-09-21 | 2018-09-21 | Double-wall drill pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811106495.0A CN108894732A (en) | 2018-09-21 | 2018-09-21 | Double-wall drill pipe |
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| CN108894732A true CN108894732A (en) | 2018-11-27 |
Family
ID=64359502
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| CN (1) | CN108894732A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112377103A (en) * | 2020-10-30 | 2021-02-19 | 中国地质大学（武汉） | Pressure feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device |
| CN112610761A (en) * | 2020-12-10 | 2021-04-06 | 席赫 | Anti-corrosion oil transportation pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112377103A (en) * | 2020-10-30 | 2021-02-19 | 中国地质大学（武汉） | Pressure feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device |
| CN112377103B (en) * | 2020-10-30 | 2021-12-10 | 中国地质大学（武汉） | Pressure feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device |
| CN112610761A (en) * | 2020-12-10 | 2021-04-06 | 席赫 | Anti-corrosion oil transportation pipe |
| CN112610761B (en) * | 2020-12-10 | 2021-08-17 | 席赫 | Anti-corrosion oil transportation pipe |
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