CN108518184A - A kind of new Joining Structure of oil well pipe and box cupling - Google Patents
A kind of new Joining Structure of oil well pipe and box cupling Download PDFInfo
- Publication number
- CN108518184A CN108518184A CN201810249954.4A CN201810249954A CN108518184A CN 108518184 A CN108518184 A CN 108518184A CN 201810249954 A CN201810249954 A CN 201810249954A CN 108518184 A CN108518184 A CN 108518184A
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- CN
- China
- Prior art keywords
- oil well
- box cupling
- well pipe
- guide post
- joining structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D15/00—Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
Abstract
The invention discloses the new Joining Structure of a kind of oil well pipe and box cupling, including more oil well pipes, it is connected by a box cupling between the end of arbitrary two adjacent oil well pipes；The end of the every oil well pipe includes hollow oil well pipe end body (1), multi-turn external screw thread (2) is distributed in the rear end outer wall of oil well pipe end body (1), and the front end of oil well pipe end body (1) has guide post (5)；Each box cupling includes hollow box cupling ontology (8), multi-turn internal thread (9) is respectively symmetrically distributed in the right and left front inner wall of the box cupling ontology (8), and box cupling ontology (8) inner wall for being located at internal thread (9) rear end has guide sleeve (11)；The external screw thread (2) and internal thread (9) intermeshing, the guide post (5) are inserted into the guide sleeve (11).The invention can ensure that being reliably tightly connected between box cupling and oil well tube end, leakproofness is strong, effectively avoids oil or natural gas leaking.
Description
Technical field
The present invention relates to field of mechanical technique, more particularly to the new Joining Structure of a kind of oil well pipe and box cupling.
Background technology
Currently, in oil gas well mining oil and natural gas, it usually needs use oil well pipe, need tens of or even number
Hundred oil well pipes, which link together, is used for transmission oil or natural gas.
In order to connect two adjacent oil well pipes, the mode being usually taken is：It is threadedly coupled by box cupling, and
The left and right ends portion of oil well pipe is all to have externally threaded tapered cylinder, and box cupling is that have the inner conical of symmetrical internal thread and outer
Cylinder, by internal thread and it is externally threaded tighten to screw form pipe fitting, realize the connection function to two oil well pipes, and
Play the role of sealing by the internal thread and external screw thread of taper, this is also the screw thread of traditional American Petroleum Institute's API standard
Connection.
For oil/gas well, it usually needs by tens of or even hundreds of oil well pipes by box cupling be twisted together formed tubing string come
Use, still, for existing oil well pipe and mating box cupling, if by repeatedly upper shackle (loading and unloading), box cupling with
The threaded connection place of oil well tube end, will be easy to happen excessive wear, bond occlusion or intensity it is insufficient the problems such as so that box cupling with
The leakproofness being threadedly coupled between the end of oil well pipe declines, and box cupling cannot fully be tightened with the end of oil well pipe and be connect, seriously
When, it results even in oil well pipe and falls off from tubing string, and cause oil or natural gas from the screw thread of box cupling and oil well tube end
The danger of junction leakage, brings serious security risk.
Therefore, a kind of technology is urgently developed at present, can ensure to carry out between box cupling and oil well tube end reliable
It is tightly connected, leakproofness is strong, and oil or natural gas can effectively be avoided to be leaked from the junction of box cupling and oil well tube end, enhancing
Overall security when oil gas well mining oil or natural gas.
Invention content
In view of this, the object of the present invention is to provide the new Joining Structure of a kind of oil well pipe and box cupling, can ensure
It is reliably tightly connected between box cupling and oil well tube end, leakproofness is strong, can effectively avoid oil or natural gas from connecing
The junction of hoop and oil well tube end leaks, and enhances overall security when oil gas well mining oil or natural gas, is conducive to wide
It promotes and applies, is of great practical significance generally.
For this purpose, the present invention provides the new Joining Structure of a kind of oil well pipe and box cupling, including more oil well pipes, arbitrary two
It is connected by a box cupling between the end of the adjacent oil well pipe of root；
The end of the every oil well pipe includes hollow oil well pipe end body, the rear end of the oil well pipe end body
Multi-turn external screw thread is distributed in outer wall, and the front end of the oil well pipe end body has guide post；
Each the box cupling includes hollow box cupling ontology, and the right and left front inner wall of the box cupling ontology is respectively symmetrically
Multi-turn internal thread is distributed with, the box cupling inner body wall for being located at the internal thread rear end has guide sleeve；
The external screw thread and internal thread intermeshing, the guide post are inserted into the guide sleeve.
Wherein, the external screw thread and the trapezoidal thread that internal thread is circular cone, the axial direction that the external screw thread and internal thread have
Cross sectional shape is trapezoidal；
The corresponding matching of the shape of the external screw thread and internal thread, size, shape, the size of the guide post and guide sleeve
Also corresponding matching.
Wherein, the axial cross section shape of the outer ledge of the guide post is arc-shaped, the inside edge of the guide sleeve
Axial cross section shape be isosceles trapezoid；
It is Interference contact between the arc-shaped peak and the conical surface of the guide sleeve that the guide post has.
Wherein, the taper of the guide post and the guide sleeve is 10 °.
Wherein, there is the first stress relief grooves, the guide sleeve and described interior between the guide post and the external screw thread
There are the second stress relief grooves between screw thread；
The axial cross section shape of first stress relief grooves and the second stress relief grooves is arc-shaped.
Wherein, the front end of the guide post has first to stop torque shoulder, and the rearmost end of the guide sleeve has second
Only torque shoulder；
Described first only torque shoulder and second only torque shoulder be correspondingly arranged.
Wherein, it described first is only also set up between torque shoulder and the inner wall of the guide post there are one transition arcs.
Wherein, the internal diameter d of the box cupling ontologyJMore than the internal diameter d of guide post in oil well pipe end bodyT, and box cupling ontology
Wall thickness tJBy the outer diameter D of guide post in oil well pipe end bodyTIt is defined as t with the internal diameter of box cuplingJ=(DT-dJ)/2, oil well pipe
The wall thickness t of guide post in end bodyTBy DTAnd dTIt determines, specific formula for calculation is：
tT=(DT-dT)/2；
The wall thickness t of the box cupling ontologyJWith the wall thickness t of guide post in oil well pipe end bodyTBetween the item that meets of relationship
Part is：0.6≤tJ/tT≤0.9。
Wherein, the inner surface for position and the box cupling main body of being in contact between the oil well pipe end body and box cupling main body is all
It is covered with one layer of eutectoid coating.
Wherein, the eutectoid coating is to carry out electricity by the mixture of teflon resin powder and crome metal powder constituent
Plate the coating formed；
The particle diameter of the teflon resin powder is 0.1 μm~1.0 μm；
Volume occupation ratio of the teflon resin powder in eutectoid coating is 10%~40%；
The case hardness of the eutectoid coating is 150Hv~1000Hv；
The thickness of the eutectoid coating is 10 μm~50 μm.
By the above technical solution provided by the invention as it can be seen that compared with prior art, the present invention provides a kind of oil wells
The new Joining Structure of pipe and box cupling, can ensure reliably to be tightly connected between box cupling and oil well tube end, seal
Property it is strong, can effectively avoid oil or natural gas from being leaked from the junction of box cupling and oil well tube end, enhance oil gas well mining stone
Overall security when oil or natural gas, is conducive to widely promote and apply, be of great practical significance.
Description of the drawings
Fig. 1 be a kind of oil well pipe and box cupling provided by the invention new Joining Structure in any one oil well tube end
Axial sectional diagrammatical view illustration；
Fig. 2 be a kind of oil well pipe and box cupling provided by the invention new Joining Structure in the axial direction of any one box cupling cut
Face schematic diagram；
Fig. 3 be a kind of oil well pipe and box cupling provided by the invention new Joining Structure on any one oil well tube end
A kind of axial sectional diagrammatical view illustration of the embodiment in portion；
Fig. 4 be a kind of oil well pipe and box cupling provided by the invention new Joining Structure in any one box cupling top axis
To schematic cross-section；
Fig. 5 be a kind of oil well pipe and box cupling provided by the invention new Joining Structure in the amplification of eutectoid coating that has
Sectional view；
Fig. 6 is when preparing the eutectoid coating that the new Joining Structure of oil well pipe and box cupling provided by the invention a kind of has,
Relation curve schematic diagram between the grain size and the amount of falling off of polytetrafluorethylepowder powder of used polytetrafluorethylepowder powder；
Fig. 7 is when preparing the eutectoid coating that the new Joining Structure of oil well pipe and box cupling provided by the invention a kind of has,
Relation curve of the used polytetrafluorethylepowder powder between the volume content and the friction coefficient of eutectoid coating of eutectoid coating
Schematic diagram；
Fig. 8 is when preparing the eutectoid coating that the new Joining Structure of oil well pipe and box cupling provided by the invention a kind of has,
Relation curve of the used polytetrafluorethylepowder powder between the volume content and the case hardness of eutectoid coating of eutectoid coating
Schematic diagram；
Fig. 9 is when preparing the eutectoid coating that the new Joining Structure of oil well pipe and box cupling provided by the invention a kind of has,
Relationship between volume content of the case hardness and polytetrafluorethylepowder powder of used eutectoid coating in eutectoid coating is bent
Line schematic diagram.
Specific implementation mode
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction with the accompanying drawings with embodiment to this
Invention is described in further detail.
Referring to Fig. 1 to Fig. 4, the present invention provides the new Joining Structures of a kind of oil well pipe and box cupling, including more oil wells
It manages, is connected by a box cupling between the end of arbitrary two adjacent oil well pipes；
The end of the every oil well pipe includes hollow oil well pipe end body 1, after the oil well pipe end body 1
Multi-turn external screw thread 2 is distributed in end outer wall, and the front end of the oil well pipe end body 1 has guide post 5；
Each the box cupling includes hollow box cupling ontology 8, and the right and left front inner wall of the box cupling ontology 8 is right respectively
Multi-turn internal thread 9 is distributed in title, and 8 inner wall of box cupling ontology for being located at 9 rear end of the internal thread has guide sleeve 11；
The external screw thread 2 and internal thread 9 are intermeshed, and the guide post 5 is inserted into the guide sleeve 11.
In the present invention, in specific implementation, the external screw thread 2 and trapezoidal (T shapes) screw thread that internal thread 9 is circular cone.
In specific implementation, the cone angle of the external screw thread 2 and internal thread 9 can be 1.5~5.0 °, the external screw thread 2 and interior
The weight-bearing surface angle of screw thread 9 can be -5 °~-4 °, the angle of the guide surface of the external screw thread 2 and internal thread 9 can be 0~
30°。
In the present invention, in specific implementation, the outer wall of the guide post 5 has conical seal (contact) face 4.
It should be noted that for the present invention, the corresponding matching of shape, size of the external screw thread 2 and internal thread 9, institute
State shape, the size also corresponding matching of guide post 5 and guide sleeve 11.
In the present invention, in specific implementation, the axial cross section shape of the outer ledge of the guide post 5 is arc-shaped, institute
The axial cross section shape for stating the inside edge of guide sleeve 11 is isosceles trapezoid；
It is connect for interference between the arc-shaped peak sp and the conical surface of the guide sleeve 11 that the guide post 5 has
It touches.
In specific implementation, the taper of the guide post 5 and the guide sleeve 11 is 10 °.
For the present invention, it should be noted that on the Dovetail interface of bullet, the pressure of perpendicular acting wedge surface is opposite
Axial force is very big；Moreover, the angle of wedge is smaller, then contact is relatively strong in the component of radial direction.For this purpose, the present invention will
The radial direction in guide post 5 and guide sleeve 11 is arranged in sealing contact surface.
In the present invention, in specific implementation, there are the first stress relief grooves between the guide post 5 and the external screw thread 2
3, there are the second stress relief grooves 10 between the guide sleeve 11 and the internal thread 9；
The axial cross section shape of first stress relief grooves, 3 and second stress relief grooves 10 is arc-shaped.
In specific implementation, the axial cross section shape of first stress relief grooves, 3 and second stress relief grooves 10 is preferably
Radius is the arc-shaped of 50mm.
It should be noted that for the present invention, due to using radial ring seal method, it is contemplated that repeatedly upper shackle process
Abrasion and the conical surface contact position variation, take larger interference volume.To eliminate the larger stress brought of interference volume, in conjunction with screw thread
Escape guide post 5 opened annular the first stress relief grooves 3 and guide sleeve 11 opened annular the second stress release
Slot 10.
In the present invention, in specific implementation, the front end of the guide post 5 has first to stop torque shoulder 6, the guiding
The rearmost end of set 11 has second to stop torque shoulder 12；
Described first stops torque shoulder 6 and second, and only torque shoulder 12 is correspondingly arranged.
In the present invention, in specific implementation, described first only also sets between torque shoulder 6 and the inner wall of the guide post 5
Transition arcs 7 there are one setting, which is the transition arcs of internal-and external diameter segment difference.
It should be noted that for the present invention, arc-shaped outer wall (i.e. curved surface) and stop torque by first that guide post 5 has
The recessed surface that shoulder 6 is formed, all can serve as annular surface, to play the role of sealing.Meanwhile in oil well pipe end body 1
External screw thread on internal thread 2 and box cupling ontology 8, the escape being all respectively arranged with (i.e. the first stress relief grooves 3 and the second stress
Release groove 10), and escape is split into arc-shaped, so that stress can be discharged.
As shown in Figure 1, for the present invention, the internal diameter d for the box cupling ontology 8 havingJMore than oil well pipe end body 1
The internal diameter d of upper guide post 5T(internal diameter of guide post 5 is consistent with the internal diameter of oil well pipe entirety), and the wall thickness t of box cupling ontology 8JBy oil
The outer diameter D of guide post 5 in well casing end body 1TIt is defined as t with the internal diameter of box cuplingJ=(DT-dJ)/2, oil well pipe end body 1
The wall thickness t of upper guide post 5TBy DTAnd dTIt determines, specific formula for calculation is：
tT=(DT-dT)/2；
In the present invention, the wall thickness t of box cupling ontology 8JWith the wall thickness t of guide post 5 in oil well pipe end body 1TBetween pass
It is that the condition met is preferably：0.6≤tJ/tT≤0.9.Meanwhile for the present invention, also FEM calculation is used to be threadedly coupled
Box cupling stress distribution suitably reduces the outer diameter of box cupling according to yield strength.This can reduce oil well while keeping sealing performance
The wall thickness of the box cupling of pipe saves the usage amount of material.
As the internal diameter d of box cupling ontology 8JLess than the internal diameter d of the guide post 5 of 1 front end of oil well pipe end bodyTWhen, by more oil
The link together latus rectum of tubing string of composition of well casing will be reduced, so dJIt is set to be greater than dT.In addition, if before box cupling
Hold thickness tJWith the nose thickness t of oil well pipe front end guide postTThe ratio between tJ/tTWhen more than 1.00, then it can not reduce the thickness of box cupling
Degree.Therefore tJ/tT1.00 must be less than, but if tJ/tTSmall is too many, and the sealing performance and mechanical strength of box cupling will drop
It is low.So tJ/tT0.60 should be more than.Optimum range is in tJ/tT=0.70~between 0.85.
In the present invention, oily to keep the sealing performance and mechanical strength that are threadedly coupled between oil well pipe and box cupling
The form of radial seal is used between well casing and box cupling.In addition, the outer circumference surface of the guide post 5 is preferably curve rotation institute shape
At annular surface, the axial cross section of cyclic annular curved surface is arc-shaped, and the contact point sp of the guide post in oil well pipe end body is
The peak of circular arc, arc radius are specifically as follows the guide post of 1/5~1/3 oil well tube end with oil well pipe diameter change
Outer diameter DT。
In the present invention, the connection of oil well pipe end body and box cupling ontology uses tapered tread, wherein guide sleeve 11
The cone angle of the outer surface of inner surface and guide post 5 is within 10 °, the seal interference amount of the arc peak sp of the guide post 5
The internal diameter d of (being denoted as δ) and box cupling ontology 8JRatio be δ/dJ, which is preferably equal to 0.02~0.03, can guarantee radial direction
Contact.
Fig. 5 be a kind of oil well pipe and box cupling provided by the invention new Joining Structure in the amplification of eutectoid coating that has
Sectional view.In the present invention, shown in Figure 5, it is in contact position (i.e. between the oil well pipe end body 1 and box cupling main body 8
Base material 100) and the inner surface of box cupling main body 8 be covered with one layer of eutectoid coating 200.
In specific implementation, the eutectoid coating is to be electroplated by the mixture of fluororesin powder and crome metal powder constituent
The coating of formation.
In specific implementation, the contact site of the oil well tube end and box cupling includes the external screw thread 2, internal thread 9, is oriented to
Column 5, guide sleeve 11, first stop torque shoulder 6 and second and stop torque shoulder 12.
It is shown in Figure 5, forming layer eutectoid coating 200 on the surface of base material 100.Eutectoid coating 200 is by making resin
What the dispersion of powder 300 and congruent melting obtained on metallic matrix,
In order to improve the oil well tube end and box cupling contact site anti-seizing property and reduce cost, choose metal
Chromium powder end.Meanwhile in order to reduce the rubbing angle analysis of shackle on screw thread, the toner 300 is preferably polytetrafluoroethylene (PTFE)
Powder.
In specific implementation, in plating, the electroplate liquid of use is by teflon resin powder and crome metal powder and body
The mixture of distilled water composition of the product than 50% is through being sufficiently stirred, uniform electroplate liquid.
Specifically preparation method is：First, teflon resin powder and crome metal powder are dispersed in electroplate liquid
In, it is then electrified to, makes current flow through electroplate liquid, metal chromium ions are in the contact site for depositing to the oil well tube end and box cupling
When the surface of (i.e. base material 100) or box cupling forms coating, metal chromium ions will be adhered to the polyflon powder beside it
Last particle coprecipitation, to form eutectoid coating.
Fig. 6 indicates the relationship of the grain size and the polytetrafluorethylepowder powder amount of falling off of polytetrafluorethylepowder powder, this is polytetrafluoroethyl-ne
Alkene powder (volume content 30%) eutectoid is in chrome plating, the result of frictional experiment.As seen from Figure 6, particle diameters are 1.0
μm or less when, the amount of falling off is considerably less.In addition, if particle diameter be less than 0.5 μm, the amount of falling off substantially constant, though using
Small powder, the raising of resistance to occlusion performance are extremely limited again for grain diameter.And particle diameter is more than after 1.0 μm, the amount of falling off straight line
Rise.But particle diameter is more than after 2.0 μm, and the amount of falling off gently rises.
Therefore, in the present invention, in specific implementation, the particle diameter of the teflon resin powder is preferably 0.1
~1.0 μm, using particle diameter in 1.0 μm of teflon resin powders below, polyflon powder can be prevented
End falls off from eutectoid coating 200.The result shows that：Eutectoid coating can reduce friction when screw thread is tightened, even if on repeating
Shackle can also prevent falling off for coating, it is ensured that the anti-seizing property of oil well pipe.
Fig. 7 indicates volume content of the polytetrafluorethylepowder powder in eutectoid coating and between the friction coefficient of eutectoid coating
Relationship, this is that the polytetrafluorethylepowder powder eutectoid that particle diameter is 0.5 μm carries out the result of frictional experiment in chrome plating.By scheming
7 as it can be seen that volume ratio of the polytetrafluorethylepowder powder in eutectoid coating be 20% or less when, the frictional decrease of eutectoid coating
Obviously；When volume ratio of the polytetrafluorethylepowder powder in eutectoid coating is between 20%~30%, the friction of eutectoid coating
Coefficient declines slow；When volume ratio of the polytetrafluorethylepowder powder in eutectoid coating is 30% or more, the friction of eutectoid coating
Coefficient does not have significant change.Therefore, in the present invention, in specific implementation, the polytetrafluorethylepowder powder is in eutectoid coating
Volume ratio is preferably 20~30%.
Fig. 8 shows pass of the polytetrafluorethylepowder powder between the volume content and the case hardness of eutectoid coating of eutectoid coating
System, this is that the polytetrafluorethylepowder powder eutectoid that particle diameter is 0.5 μm carries out the result of experiment of hardness in chrome plating.By Fig. 8
As it can be seen that the volume ratio of polytetrafluorethylepowder powder, when within 30%, the case hardness of eutectoid coating slowly declines；But work as poly- four
When the volume ratio of vinyl fluoride powder is more than 30%, the case hardness of eutectoid coating declines slightly apparent.Therefore, in the present invention
In, in specific implementation, volume occupation ratio of the teflon resin powder in eutectoid coating can be 10%~
40%, best volume ratio range is 10%~30%.
Fig. 9 is indicated between the volume content of the case hardness and polytetrafluorethylepowder powder of eutectoid coating in eutectoid coating
Relationship, this is that the polytetrafluorethylepowder powder eutectoid that particle diameter is 0.5 μm carries out the result of frictional experiment in chrome plating.By scheming
9 as it can be seen that when the case hardness of eutectoid coating 150Hv (Vickers hardness) below when, with the reduction of case hardness, polytetrafluoroethyl-ne
The amount of falling off of alkene powder sharply increases；And the case hardness of eutectoid coating with the increase of case hardness, is gathered when being more than 150Hv
The amount of the falling off variation of tetrafluoroethene powder is smaller.In addition, when the case hardness of eutectoid coating is more than 1000Hv, eutectoid coating becomes
It is crisp, it falls off the result is that easy ting produce.Therefore, in the present invention, in specific implementation, the case hardness of the eutectoid coating is preferably
150Hv~1000Hv at this time can inhibit teflon resin powder to fall off from eutectoid coating 200.
In addition, if the thickness of eutectoid coating is excessively thin, then teflon resin powder is also easy to fall off from eutectoid coating,
The effect of friction cannot be reduced in the upper shackle process of oil well pipe.On the other hand, if eutectoid coating is blocked up, spiral shell is connected
Gap between line disappears, and surface pressing when screw-driving increases, to be easy to happen adhesion occlusion.Therefore, at this
In invention, in specific implementation, the thickness of the eutectoid coating is preferably 10 μm~50 μm.
With reference to specific embodiment, to illustrate according to a kind of novel connection of oil well pipe and box cupling provided by the invention
The superiority of structure.
For the present invention, in specific implementation, the oil well that outer diameter D is equal to 9.17mm equal to 139.7mm, wall thickness t can be prepared
The box cupling that pipe and outer diameter are 153.7, it is 758~965MPa, tensile strength that oil well pipe material, which can select P110 steel, yield strength,
≥862MPa。
As shown in table 1 below, in threaded connection, the internal diameter d of box cuplingJ, the internal diameter d of oil well pipe terminal guide columnT, box cupling
Wall thickness tJWith the guide post wall thickness t of oil well pipeTIt is combined in many ways.It is outer at the seal point of oil well pipe terminal guide column
Diameter DTSetting as shown in table 1.
It should be noted that for the embodiment of the present invention, the threaded connection between oil well pipe and box cupling is in addition to institute in table 1
Outside the specifications parameter of row, the other parameters of connection are all identical.The shape for the guide post that predominantly oil well tube end has is
The annular that arc-shaped cross sectional shape, the first stress relief grooves 3 of the annular that guide post 5 has and the guide sleeve of box cupling have
Second stress relief grooves 10, the axial cross sections of the two release grooves are the circular arcs that radius is 50mm, guide post 5 and guide sleeve 11
The pressure of annular sealing surface is radial direction, and the maximum point of juxtaposition metamorphose is happened at the arc peak sp of guide post 5, and sealing is dry
The amount of relating to is defined as the seal interference amount (being denoted as δ) of arc peak sp, the seal interference amount (being denoted as δ) of arc peak sp with connect
Bind round internal diameter dJRatio be δ/dJ, the ratio is equal to 0.025, and in specific implementation, the external screw thread 2 and internal thread 9 are circular cone spiral shell
Line, the cross sectional shape having are trapezoidal, and the cone angle of the external screw thread 2 and internal thread 9 is equal to 2.0 °, the external screw thread 2 and interior
The weight-bearing surface angle of screw thread 9 is -3 °, the angle of the guide surface of the external screw thread 2 and internal thread 9 is 20 °.
It should be noted that these screw connection points all press oil as defined in 13679 standards of ISO and API 5C5 standards
Gas industry casing and tubing round thread joint test program, the A campaigns and screw thread of the air-tightness being threadedly coupled
Button assessment experiment.
Screw thread tighten or disassembly process in, general opinion rating is：Dismounting screw thread 20 times or more is tightened not glue
The occasion of button is evaluated as good (◎)；The occasion that thread gluing does not occur for dismounting screw thread 10~19 times or more is tightened, being evaluated as can
(○)；The occasion that thread gluing does not occur for dismounting screw thread 5~9 times or more is tightened, being evaluated as can not (△)；Tighten dismounting screw thread 4 times with
The lower occasion that thread gluing occurs, is evaluated as poor (×).
In the resistance to leakage performance experiment of screw thread, A series of tests is carried out after screw threads for fastening, is commented in the case of seal failure
Valence is "×", and "○" is evaluated as in the case of sealing without leakage.The judgement of failure is based on specified in 13679 standards of ISO
Fluid leakage reference value is judged.In A series of tests, loading procedure is fixed by VME 95% and API Collapse pressure
Justice, but maximum compression ratio (the ratio between yield stress and load compression stress) should be determined by the requirement of client, be pressed in tested
It is conventional to set maximum compression ratio as 80%.
Table 1 shows the evaluation of sealing performance and anti-galling performance and thinned effect has (zero) or without (×).Such as table 1
It is shown, box cupling provided by the invention and oil well tube end sample (dT＜ dJAnd 0.6 ＜ tJ/tT＜ 1.0) and traditional (tJ/tT=
1.0) box cupling has same sealing performance and anti-galling performance compared with oil well pipe end product, it can be seen that, the present invention
Being thinned for box cupling can be realized in the case where not reducing sealing performance and anti-galling performance.
Table 1：
By using outer diameter is 139.7mm, the connector of oil well pipe that wall thickness is 9.17mm (corresponding to API standard P110) and
Box cupling repeats upper shackle, the presence or absence of detection metal resist blocking and that occlusion.The screw thread position of oil well tube end and box cupling and close
There is eutectoid coating at envelope position, and the condition of shackle takes seal interference amount δ/d on screw threadJ=0.025, tJ/tT=0.75, eutectoid plating
The characteristic of layer is as shown in table 2 below.
Table 2：
It can be, it is apparent that even if being glued if multiplicating carries out in the upper shackle embodiment of the present invention that metal does not occur by table 2
Even scuffing.If metal adhesion occlusion does not occur for the upper shackle that parameter can preferably carry out 20 times or more.
Compared with prior art, for the present invention, with advantageous effect below：
1, in the present invention, the internal diameter of box cupling ontology is bigger than the internal diameter of oil well pipe end body, can be in 8%~12% model
Within enclosing；In addition, between the wall thickness and the wall thickness of oil well pipe end body of box cupling ontology, there are certain particular kind of relationship, can subtract
Sealing performance and abrasion resistance properties of the wall thickness of minor thread box cupling without reducing tubing string, can reduce threaded collar joint material；
2, tubing string connection includes box cupling and oil well pipe two parts, has internal thread on box cupling, there is external screw thread, the two on oil well pipe
It realizes and is threadedly coupled, form the tubing string of metal sealing；
3, the joint area of oil well pipe is as shown in Figure 3 and Figure 4, has the guide post of extension in the front end of oil well pipe end body
Only torque shoulder 6, guide post carry the angle of taper with first as sealing；The recessed surface of front end stops torque for first
Shoulder and secondary sealing area；Arc-shaped guide part is formed by the sealing surface that circular arc is annular.Externally threaded escape (i.e. first
Stress relief grooves) it is split into arc-shaped, so that stress can be discharged；
It should be noted that lubricating condition and surface of traditional circumferential contact surface sealing means because of tightening torque by screw thread
The influence of characteristic and mismachining tolerance etc., it is difficult to accurately control.For this purpose, the present invention considers by using radial ring seal method
To the abrasion of multiple upper shackle process and the contact position variation of the conical surface, the present invention takes larger interference volume.The present invention is increasing
After the interference volume of contact, the guide post of the taper of oil well tube end and radial stress suffered by box cupling increase, and needing to take must
The measure wanted carries out stress release.To eliminate the larger stress brought of interference volume, stress release ring is opened in conjunction with the escape of screw thread；
In radial seal mode, repeatedly upper shackle can accelerate the abrasion of contact surface.At this moment, it needs to increase in sealing contact
Interference volume, actually increase oil well tube end sealing ring and box cupling sealing ring seal interference amount.
4, all pass through corrosion resistant metal ion and plastics in the screw thread and contact position of oil well pipe end body and box cupling ontology
The eutectoid of toner mixed solution precipitates to form coating, and the abrasion of contact surface is reduced by coating, prevents falling off for coating
It falls off with metal adhesion and Thread-sticking.
5, for the present invention, it is suitable for the oil pipe of the oil gas field tubing strings all with casing etc. to connect, and the present invention is in order to anti-
Only the liquid such as oil flow through oil well pipe end body and the junction of box cupling ontology is formed by section difference and generates turbulent flow, oil well
The guide post of tube end ontology has larger circular arc so that the internal diameter of the internal diameter of oil well pipe end body and box cupling ontology have it is round and smooth
Transition, to which will not to form section on the inner surface of connection poor.Moreover, the internal diameter of oil well pipe end body and whole interior
Diameter is consistent, not no suddenly change due to connection of internal diameter, to prevent the liquid flowed in pipeline from generating turbulent flow as much as possible；
6, for the present invention, being formed by space between box cupling ontology and oil well pipe end body does not have liquid flow
Body does not flow having liquid.Therefore, among the threaded connection space of box cupling, as long as not preventing sealing performance and resistance to viscous
Performance is detained, if inner surface has step, also there is no problem.On the contrary, the wall thickness by reducing box cupling, helps to save resource.
It should be noted that for the present invention, the new Joining Structure of the oil well pipe and box cupling that provide, have material saving,
The advantages of bite-resistant and wear resistance.The present invention can reduce box cupling by the internal diameter for increasing box cupling and reduction outer diameter appropriate
Materials'use, the results showed that the ratio between the wall thickness of box cupling and the wall thickness of oil well pipe are 0.6~0.9.Meanwhile in order to prevent due to connecing
Hoop internal diameter increase is formed by turbulent phenomenon caused by section difference, the guide post front end that oil well tube end has formed compared with
Big circular arc (the axis cross sectional shape being arc-shaped) so that the internal diameter of oil well tube end and box cupling has round and smooth transition.
In addition, ring shaped metallic seal mode and larger interference volume of the present invention using radial direction, and the circular arc by the way that guide post 5 to have
The Interference contact of the peak sp and conical guiding sleeve 11 of shape form annular sealing surface, are answered by the first stress relief grooves 3 and second
Power release groove 10 plays a supporting role, and can eliminate the axial stress that interference volume is brought.
In addition, for the present invention, the sealing position and screw thread position of oil well tube end and box cupling are all covered by corrosion-resistant
Metal chromium ions and polytetrafluorethylepowder powder mixing liquid eutectoid caused by coating, eutectoid precipitate coating thickness be 10
To 50 μm, the polyflon particle size diameter of eutectoid deposited plating layer is 0.1 to 1.0 μm, the polytetrafluoro in mixed solution
The volume ratio of vinyl powder is 10~50%, and eutectoid coating has the case hardness of 150~1000Hv.
In conclusion compared with prior art, a kind of new Joining Structure of oil well pipe and box cupling provided by the invention,
It can ensure reliably to be tightly connected between box cupling and oil well tube end, and leakproofness is strong, can effectively avoid oil or
Natural gas is leaked from the junction of box cupling and oil well tube end, enhances general safety when oil gas well mining oil or natural gas
Property, be conducive to widely promote and apply, be of great practical significance.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. the new Joining Structure of a kind of oil well pipe and box cupling, which is characterized in that including more oil well pipes, arbitrary two adjacent
It is connected by a box cupling between the end of oil well pipe；
The end of the every oil well pipe includes hollow oil well pipe end body (1), after the oil well pipe end body (1)
Multi-turn external screw thread (2) is distributed in end outer wall, and the front end of the oil well pipe end body (1) has guide post (5)；
Each the box cupling includes hollow box cupling ontology (8), and the right and left front inner wall of the box cupling ontology (8) is right respectively
Multi-turn internal thread (9) is distributed in title, and box cupling ontology (8) inner wall for being located at the internal thread (9) rear end has guide sleeve
(11)；
The external screw thread (2) and internal thread (9) intermeshing, the guide post (5) are inserted into the guide sleeve (11).
2. new Joining Structure as described in claim 1, which is characterized in that the external screw thread (2) and internal thread (9) are circular cone
Trapezoidal thread；
External screw thread (2) matching corresponding with shape, the size of internal thread (9), the guide post (5) and guide sleeve (11)
The also corresponding matching of shape, size.
3. new Joining Structure as described in claim 1, which is characterized in that the axial direction of the outer ledge of the guide post (5)
Cross sectional shape is arc-shaped, and the axial cross section shape of the inside edge of the guide sleeve (11) is isosceles trapezoid；
It is connect for interference between the arc-shaped peak and the conical surface of the guide sleeve (11) that the guide post (5) has
It touches.
4. new Joining Structure as described in claim 1, which is characterized in that the guide post (5) and the guide sleeve (11)
Taper be 10 °.
5. new Joining Structure as described in claim 1, which is characterized in that the guide post (5) and the external screw thread (2) it
Between there are the first stress relief grooves (3), with the second stress relief grooves between the guide sleeve (11) and the internal thread (9)
(10)；
The axial cross section shape of first stress relief grooves (3) and the second stress relief grooves (10) is arc-shaped.
6. the new Joining Structure as described in any one of claim 1 to 5, which is characterized in that the guide post (5) most before
End has first to stop torque shoulder (6), and the rearmost end of the guide sleeve (11) has second to stop torque shoulder (12)；
Described first only torque shoulder (6) and second stop torque shoulder (12) be correspondingly arranged.
7. new Joining Structure as claimed in claim 6, which is characterized in that described first only torque shoulder (6) and described leads
To being also set up between the inner wall of column (5), there are one transition arcs (7).
8. the new Joining Structure as described in any one of claim 1 to 5, which is characterized in that the box cupling ontology (8) it is interior
Diameter dJMore than the internal diameter d of guide post (5) in oil well pipe end body (1)T, and the wall thickness t of box cupling ontology (8)JBy oil well tube end
The outer diameter D of guide post (5) on ontology (1)TIt is defined as t with the internal diameter of box cuplingJ=(DT-dJ)/2, in oil well pipe end body (1)
The wall thickness t of guide post (5)TBy DTAnd dTIt determines, specific formula for calculation is：
tT=(DT-dT)/2；
The wall thickness t of the box cupling ontology (8)JWith the wall thickness t of guide post (5) in oil well pipe end body (1)TBetween relation character
The condition of conjunction is：0.6≤tJ/tT≤0.9。
9. the new Joining Structure as described in any one of claim 1 to 5, which is characterized in that the oil well pipe end body
(1) inner surface for position and the box cupling main body (8) of being in contact between box cupling main body (8) is covered with one layer of eutectoid coating
(200)。
10. new Joining Structure as claimed in claim 9, which is characterized in that the eutectoid coating is by polytetrafluoroethylene (PTFE) tree
The mixture of cosmetics end and crome metal powder constituent carries out the coating of plating formation；
The particle diameter of the teflon resin powder is 0.1 μm~1.0 μm；
Volume occupation ratio of the teflon resin powder in eutectoid coating is 10%~40%；
The case hardness of the eutectoid coating is 150Hv~1000Hv；
The thickness of the eutectoid coating is 10 μm~50 μm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810249954.4A CN108518184A (en) | 2018-03-26 | 2018-03-26 | A kind of new Joining Structure of oil well pipe and box cupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810249954.4A CN108518184A (en) | 2018-03-26 | 2018-03-26 | A kind of new Joining Structure of oil well pipe and box cupling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108518184A true CN108518184A (en) | 2018-09-11 |
Family
ID=63434324
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810249954.4A Pending CN108518184A (en) | 2018-03-26 | 2018-03-26 | A kind of new Joining Structure of oil well pipe and box cupling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112934444A (en) * | 2021-01-21 | 2021-06-11 | 南昌矿山机械有限公司 | Multi-cylinder cone crusher frame |
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