CN108952594A - A kind of low stress screw connection structure - Google Patents
A kind of low stress screw connection structure Download PDFInfo
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- CN108952594A CN108952594A CN201810558246.9A CN201810558246A CN108952594A CN 108952594 A CN108952594 A CN 108952594A CN 201810558246 A CN201810558246 A CN 201810558246A CN 108952594 A CN108952594 A CN 108952594A
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- 230000006835 compression Effects 0.000 abstract description 9
- 238000007906 compression Methods 0.000 abstract description 9
- 238000004026 adhesive bonding Methods 0.000 abstract description 8
- 238000007789 sealing Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B17/08—Casing joints
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- Life Sciences & Earth Sciences (AREA)
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of low stress screw connection structure, including external thread piece and inner thread piece, external thread piece has external screw thread, and inner thread piece has internal screw thread, and external screw thread intermeshes with internal screw thread under tight condition；The guide surface of the internal screw thread is made of upper semisection inclined-plane and lower semisection inclined-plane, and the inclination angle on the upper semisection inclined-plane is β, and the inclination angle on the lower semisection inclined-plane is γ, also, β < γ；Externally threaded guide surface corresponding with the guide surface of the internal screw thread is the inclined-plane that inclination angle is β.The lower semisection inclined-plane of the guide surface of internal screw thread of the invention is arranged very gentle, facilitate make-up, and upper semisection inclined-plane is steeper, make screw thread that there is preferable resistance to compression, and corresponding externally threaded guide surface only has one section, inclination angle β, so that being convenient for make-up when upper button, being not easy thread alternating, it is less likely to occur stress concentration on guide surface, to avoid guide surface thread gluing.
Description
Technical field
The present invention relates to a kind of low stress screw connection structures, belong to oil casing threaded interconnection technique field.
Background technique
With the development of national economy, the demand to petroleum, natural gas is increasing, and the oil gas well depth of probing is increasingly
Deep, the earth formation encountered becomes increasingly complex, exploitation tool therein (specifically including that oil pipe, casing and drilling rod etc.) is wanted
It asks higher and higher, embodies a concentrated reflection of the material property to exploitation tool and the quality requirement of threaded connection: for material, mainly
It is high-intensitive, corrosion-resistant, the resistant to high temperatures material of research and development, is then to need to continually develop joint efficiency height, sealing for connection screw thread
Performance is good, anti-twisting property is strong, can repeatedly on the high-quality connector that unloads.
For well depth be more than 5000m more than deep-well, ultradeep well, for horizontal displacement be more than 1000 meters horizontal well, greatly
It is displaced well, and is more than 80MPm for down-hole pressure and/or temperature change is more than 150 DEG C of hp-ht well, above-mentioned hole condition,
Since tubing string bears very big stretching, compression, internal pressure, temperature etc., according to general API screw thread, application risk is very big, must
Must details for helicitic texture, the details of sealing structure carry out OVERALL OPTIMIZA-TION DESIGN FOR, can meet the requirements.Therefore, it is necessary to
Develop corresponding Special threading connector.
API screw thread does not have metal/metal sealing structure, and screw thread should undertake linkage function, undertake sealing function again.And
For Special threading connector, structure taper pipe thread, metal/metal sealing and torque shoulder three parts composition, screw thread only need
Linkage function is undertaken, sealing function is undertaken by special structure, this just provides broader space for optimization Design of Screw Thread.
Chinese patent CN 2886276Y discloses a kind of incompressible and curved configuration tooth thread connection structure, it includes
Box cupling of one both ends with internal screw thread and conical seal (contact) face and torque shoulder, is respectively provided with external screw thread there are also two and taper is close
The casing connection of cover and torque shoulder forms.The internal screw thread and external screw thread are made of hook-type tooth thread.The hook tooth
The tooth form of screw thread is hook tooth tooth form, and approaching face angle is 20 °, and loading end angle is -4 °, and angle of thread is 16 °.The interior spiral shell
The a height of 1.675mm of the tooth of line, the externally threaded a height of 1.575mm of tooth, half tooth high setting of internal and external screw thread is asymmetric.This is specially
Benefit improves thread shape, improves the bending resistance of entire connector, and resistance to compression also increases because of the setting of torque shoulder
By force.But the disadvantage is that not considering the stress concentration of optimization threaded portion, the anti-galling scarce capacity of screw thread.
6698802 B2 of United States Patent (USP) US discloses a kind of coupling, and the present invention is on the basis of API buttress thread
On, it sets guiding face angle to 15~60 ° (guiding face angles of API buttress thread be 10 °), gentle guiding face angle is easy to pair
It detains and is not susceptible to thread alternating, the transition arc radius for being oriented to face angle increases to 1.0~1.25mm (radius of API buttress thread
For 0.76mm), while the tooth top of screw thread, bottom of the tooth being all provided with to be set to and are parallel to tube axis, the changes of these structures also for
Make-up is easier.The disadvantage is that guide surface is excessively gentle, although improving the anti-galling ability of connector, the anti-of connector will lead to
Compression performance decline.
Summary of the invention
The technical problems to be solved by the present invention are: overcoming the deficiencies of the prior art and provide a kind of low stress threaded connection
Structure can guarantee that external thread piece and inner thread piece have certain resistance to compression, and be not easy thread alternating.
In order to solve the above-mentioned technical problem, the technical scheme is that a kind of low stress screw connection structure, including it is outer
Screw element and inner thread piece, external thread piece have external screw thread, and inner thread piece has internal screw thread, external screw thread and interior spiral shell under tight condition
Line intermeshes；
The guide surface of the internal screw thread is made of upper semisection inclined-plane and lower semisection inclined-plane, and the inclination angle on the upper semisection inclined-plane is
β, the inclination angle on the lower semisection inclined-plane are γ, also, β < γ；
Externally threaded guide surface corresponding with the guide surface of the internal screw thread is the inclined-plane that inclination angle is β.
Further, the inclination angle on the upper semisection inclined-plane and angle of inclination beta=10 °~15 ° of externally threaded guide surface, it is described
Tilt angle gamma=30 °~45 ° on lower semisection inclined-plane.
Further, the length on the upper semisection inclined-plane is greater than the length on the lower semisection inclined-plane.
Further, the junction on the upper semisection inclined-plane and lower semisection inclined-plane is located at below the middle line of internal screw thread guide surface
At h2, h2=0.2mm~0.3mm.
Further, externally threaded loading end is an inclined-plane, and inclination angle α, α=3~5 ° are corresponding with externally threaded loading end
The loading end of internal screw thread by radius be that R circular arc forms, R=50~60mm, the circular arc and inclination angle are the inclined-plane of α in internal screw thread
It is tangent at middle line.
Further, pass through the intermediate incline connection at one 45 ° of inclination angles, the intermediate incline between externally threaded loading end and tooth top
Distance of the lower end away from tooth top be h4, h4=0.2 ± 0.05mm.
Further, inclination alpha is consistent with the inclined direction of angle of inclination beta, tilt angle gamma.
Further, it after internal and external screw thread engagement, is kept in contact between the tooth top and external screw thread bottom of the tooth of internal screw thread, and internal screw thread
Bottom of the tooth and externally threaded tooth top between there are the gaps of 0.05~0.1mm.
Further, the tooth of the internal screw thread a height of h1, h1=1.4~1.6mm, the externally threaded a height of h3 of tooth, interior spiral shell
The high h1 of the tooth of line h3 high 0.05~0.1mm higher than externally threaded tooth, the middle line of the tooth top of the internal screw thread to internal screw thread away from
From for h=1/2h3, the distance of externally threaded bottom of the tooth to the externally threaded middle line is also h=1/2h3.
Further, it after internal and external screw thread engagement, is kept in contact between internal screw thread loading end and external screw thread loading end, and interior spiral shell
There is also the gaps of 0.05~0.1mm between line guide surface and external screw thread guide surface.
Further, the bottom of the tooth of the internal screw thread and tooth top and the externally threaded bottom of the tooth and tooth top are each parallel to tubing and casing
Axis.
Further, internal screw thread and external screw thread are taper pipe thread, and taper is 1:16~1:18.
Using above-mentioned technical proposal, the invention has the following advantages:
1) the lower semisection inclined-plane of the guide surface of internal screw thread of the invention is arranged very gentle, facilitates make-up, and upper semisection is oblique
Face is steeper, and screw thread is made to have preferable resistance to compression, and corresponding externally threaded guide surface only has one section, inclination angle β,
So that being convenient for make-up when upper button, being not easy thread alternating, it is less likely to occur stress concentration on guide surface, to avoid guide surface thread gluing；
2) loading end of internal screw thread and externally threaded loading end are tangent at pitch diameter of thread line, so that screw thread load is maximum
Point appears in engagement threaded middle, and after internal and external screw thread engagement, the loading end of externally threaded loading end and internal screw thread is interference fitted,
So that the maximum point of magnitude of interference is located at screw thread middle position, and it is gradually reduced to two sides, the stress of screw thread loading end is improved,
Bonding strength improves, while avoiding screw thread loading end and thread gluing occur；
3) it after internal and external threads engagement, is kept in contact between internal screw thread tooth top and external screw thread bottom of the tooth, and internal screw thread bottom of the tooth and outer
There are the gaps of 0.05~0.1mm between screw thread tooth top, thus be conducive to discharge thread compound generated after screw thread is tightened it is additional
Stress；
4) bottom of the tooth of internal screw thread of the invention and tooth top and the externally threaded bottom of the tooth and tooth top are each parallel to tubing and casing
Axis, the bus without being parallel to screw thread, i.e. pitch diameter of thread line make spiral shell when internal and external screw thread part spinner in the vertical direction
Line is easy to recognize button, and thread alternating will not occur.
Detailed description of the invention
Fig. 1 is the axial, cross-sectional view after the completion of detaining on inner thread piece and external thread piece of the invention；
Fig. 2 is internal screw thread and externally threaded cooperation schematic diagram；Screw thread tooth top, bottom of the tooth are parallel with tubing and casing axis；
Fig. 3 is the portion the E enlarged drawing of Fig. 2；
Fig. 4 is internal screw thread and externally threaded shape and its key dimension schematic diagram, wherein top is internal screw thread, and lower part is
External screw thread；
Fig. 5 is that the loading end of internal screw thread is the schematic illustration for the circular arc that radius is R；
In figure, 1, external thread piece, 2, inner thread piece, 3, internal screw thread loading end, 4, internal screw thread bottom of the tooth, 5, internal screw thread guiding
Face, 6, internal screw thread tooth top, 7, pitch diameter of thread line, 8, external screw thread bottom of the tooth, 9, external screw thread guide surface, 10, external screw thread tooth top, 11, outer
Screw thread loading end, 12, internal screw thread, 13, external screw thread, 14, tubing and casing axis.
Specific embodiment
In order that the present invention can be more clearly and readily understood, right below according to specific embodiment and in conjunction with attached drawing
The present invention is described in further detail.
Unless not defining, the technical term or scientific term used herein, which is should be in fields of the present invention, to be had
The ordinary meaning that the personage of general technical ability is understood." first " used in the invention patent specification and claims,
" second " and similar word are not offered as any sequence, quantity or importance, and are used only to distinguish different compositions
Part.Equally, the similar word such as "one" or " one " does not indicate that quantity limits yet, but indicates that there are at least one.
As shown in Figure 1, a kind of low stress screw connection structure, including external thread piece 1 and inner thread piece 2, external thread piece 1
With external screw thread 13, inner thread piece 2 has internal screw thread 12, and external screw thread 13 intermeshes with internal screw thread 12 under tight condition.
Fig. 2 buckles the partial enlarged view of beam rear thread tooth on being, the portion the E enlarged drawing of Fig. 2, Fig. 4 show screw thread in Fig. 3
Shape and its key dimension, wherein upper figure is internal screw thread 12, the following figure is external screw thread 13；In conjunction with Fig. 2, Fig. 3, Fig. 4, internal screw thread 12
It is taper pipe thread, taper 1:16~1:18 with external screw thread 13.It is well known that the guide surface angle of screw thread is gentler, more hold
Easy make-up, but excessively can gently reduce the resistance to compression of screw thread.
In the present embodiment, the guide surface 5 of the internal screw thread 12 is made of upper semisection inclined-plane 51 and lower semisection inclined-plane 52, described
The inclination angle on upper semisection inclined-plane 51 is β, and the inclination angle on the lower semisection inclined-plane 52 is γ, also, β < γ；
The guide surface 9 of external screw thread 13 corresponding with the guide surface 5 of the internal screw thread 12 is the inclined-plane that inclination angle is β.
The lower semisection inclined-plane 52 of the guide surface 5 of internal screw thread 12 is arranged very gentle, facilitates make-up, and upper semisection inclined-plane 51
It is relatively steep, make screw thread that there is preferable resistance to compression.And the guide surface 9 of corresponding external screw thread 13 only has one section, inclination angle β
=10~15 °.It is convenient for make-up when setting purpose is upper button in this way, is not easy thread alternating, is less likely to occur stress concentration on guide surface, from
And avoid guide surface thread gluing.
Preferably, as shown in Figure 2 and Figure 3, the guide surface 9 at the inclination angle and external screw thread 13 on the upper semisection inclined-plane 51
Angle of inclination beta=10 °~15 °, tilt angle gamma=30 °~45 ° on the lower semisection inclined-plane 52.
Preferably, the junction on the upper semisection inclined-plane 51 and lower semisection inclined-plane 52 is located at 7 lower section h2 of pitch diameter of thread line
Place, h2=0.2mm~0.3mm.The length on the upper semisection inclined-plane 51 is greater than the length on the lower semisection inclined-plane 52, further mentions
High screw thread has preferable resistance to compression.
For loading end, the loading end of internal and external screw thread is inclined-plane under normal circumstances, at the tooth top or is being leaned on after engagement
Often occurs stress concentration at nearly bottom of the tooth, engagement screw thread stress, which concentrates on this 2 positions, not only to be made to be easy thread gluing herein, and right
The bonding strength of connector is also unfavorable.
Preferably, as shown in figure 5, the loading end 11 of external screw thread 13 is an inclined-plane, inclination angle α, α=3~5 °, with external screw thread
The loading end 3 of the 13 corresponding internal screw thread 12 of loading end 11 is made of the circular arc that radius is R, R=50~60mm, internal screw thread
The loading end of 12 loading end 3 and external screw thread 13 is tangent at pitch diameter of thread line 7, so that the maximum point of screw thread load is appeared in and nibbled
Close threaded middle.After internal and external screw thread engagement, loading end 11 and loading end 3 are interference fitted, so that the maximum point of magnitude of interference is located at spiral shell
Line middle position, and be gradually reduced to two sides, as shown in Figure 2.By this improvement, the stress of screw thread loading end is improved,
Bonding strength improves, while avoiding screw thread loading end and thread gluing occur.
It is connected between the loading end 11 and tooth top 10 of external screw thread 13 by the intermediate incline at one 45 ° of inclination angles, rather than it is common
Arc transition, the lower end of the intermediate incline are h4, h4=0.2 ± 0.05mm away from the distance of tooth top 10, it is therefore an objective to slow down engagement spiral shell
Stress at line fillet is concentrated, and thread damage is prevented.
Inclination alpha is consistent with the inclined direction of angle of inclination beta, tilt angle gamma, and thread shape shows as hook-type.This hook screw thread is maximum
Reduce to degree the radial stress generated after screw thread engagement, not only increases the bonding strength of connector, also improve connector
Bending resistance.
Preferably, it after internal and external screw thread engagement, is kept in contact between the tooth top 6 and external screw thread bottom of the tooth 8 of internal screw thread, and interior spiral shell
There are the gaps of 0.05~0.1mm between the bottom of the tooth 4 and externally threaded tooth top 10 of line.
Optionally, a height of h of the tooth of the internal screw thread1, h1=1.4~1.6mm, the externally threaded a height of h of tooth3, internal screw thread
The high h of tooth1It is h higher than externally threaded tooth3The distance of high 0.05~0.1mm, tooth top 6 to the pitch diameter of thread line 7 of the internal screw thread are h
=1/2h3, the distance of externally threaded bottom of the tooth 8 to the externally threaded middle line 7 is also h=1/2h3, so that after screw thread engagement, it is interior
Be kept in contact between screw thread tooth top 6 and external screw thread bottom of the tooth 8, and between internal screw thread bottom of the tooth 4 and external screw thread tooth top 10 there are 0.05~
The gap of 0.1mm.The gap is arranged to be conducive to discharge the additional stress that thread compound generates after screw thread is tightened.
Meanwhile by the facewidth of internal screw thread setting it is different from external screw thread, screw thread engage after, loading end 3, loading end 11 it
Between be kept in contact, and there is also the gap of 0.05~0.1mm between guide surface 5, guide surface 9, gap effect and tooth top, bottom of the tooth
Between gap it is identical, be conducive to discharge the additional stress that generates after screw thread is tightened of thread compound.
Regular screw threads tooth top, bottom of the tooth are each parallel to screw thread bus, the bottom of the tooth 4 and tooth top of the embodiment of the present invention internal screw thread 12
6 and the external screw thread 13 bottom of the tooth 8 and tooth top 10 each parallel to tubing and casing axis 14, bus without being parallel to screw thread,
That is pitch diameter of thread line 7.Be arranged in this way it is extremely important, internal and external screw thread part in Oil Field in use, sling on derrick,
Spinner on vertical direction, it is easy to which thread alternating is arranged to shoulder tooth in this way, and screw thread is easy to recognize button, and thread alternating will not occur.
The screw thread of the internal and external threads part of the present embodiment is easy make-up, execute-in-place more convenient and quicker, and is threadedly coupled effect
Rate is high, and stress distribution is reasonable, and anti-galling ability is strong, can repeat to unload without damaged screw.
In order to clearly indicate that effect of the invention, with actually use in casing joint and oil connection said
It is bright.
The casing joint of Φ 177.8 × 10.36mm Q125 grade of steel, the outer diameter of pin end is 177.8mm, and wall thickness is
10.36mm, the outer diameter of female connector are 200.03mm, and length is 310mm.The screw pitch of internal and external threads is 5.08mm, taper 1:16.It is interior
The high 1.65mm of thread, internal screw thread guide surface angle beta=10 °, γ=30 °, 3 ° of loading end inclined-plane, arc radius R=50mm；Outer spiral shell
The high 1.55mm of line tooth, external screw thread carry 3 ° of face angle, 10 ° of face angle of guiding.Magnitude of interference after internal and external screw thread engagement is 0.175mm.It should
Connector bonding strength reaches 4695kN, can satisfy on 45 and unloads and damages without thread gluing.
The oil connection of Ф 88.9 × 7.34mm P110 grade of steel, the outer diameter of pin end are 88.9mm, and wall thickness is 7.34mm,
The outer diameter of female connector is 107.95mm, and length is 219mm.The screw pitch 4.23mm of internal and external threads, taper 1:16.Internal screw thread tooth is high
1.55mm, internal screw thread guide surface angle beta=10 °, γ=30 °, 3 ° of loading end inclined-plane, arc radius R=30mm；External screw thread tooth is high
1.45mm, external screw thread carry 3 ° of face angle, 10 ° of face angle of guiding.Magnitude of interference after internal and external screw thread engagement is 0.125mm.The connector connects
It connects intensity and reaches 1421kN, can satisfy on 10 9 and unload and damaged without thread gluing.
Particular embodiments described above, pair present invention solves the technical problem that, technical scheme and beneficial effects carry out
It is further described, it should be understood that the above is only a specific embodiment of the present invention, is not limited to this
Invention, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this hair
Within bright protection scope.
Claims (12)
1. a kind of low stress screw connection structure, it is characterised in that: including external thread piece (1) and inner thread piece (2), external thread piece
(1) there are external screw thread (13), inner thread piece (2) has internal screw thread (12), external screw thread (13) and internal screw thread (12) under tight condition
It intermeshes；
The guide surface (5) of the internal screw thread (12) is made of upper semisection inclined-plane (51) and lower semisection inclined-plane (52), the upper semisection
The inclination angle on inclined-plane (51) is β, and the inclination angle of the lower semisection inclined-plane (52) is γ, also, β < γ；
The guide surface (9) of external screw thread (13) corresponding with guide surface (5) of the internal screw thread (12) is the inclined-plane that inclination angle is β.
2. low stress screw connection structure according to claim 1, it is characterised in that: upper semisection inclined-plane (51) incline
Angle of inclination beta=10 °~15 ° of the guide surface (9) of angle and external screw thread (13), tilt angle gamma=30 ° of the lower semisection inclined-plane (52)
~45 °.
3. low stress screw connection structure according to claim 2, it is characterised in that: the length of the upper semisection inclined-plane (51)
Degree is greater than the length of the lower semisection inclined-plane (52).
4. low stress screw connection structure according to claim 3, it is characterised in that: the upper semisection inclined-plane (51) and under
The junction of half section of inclined-plane (52) is located at below pitch diameter of thread line (7) at h2, h2=0.2mm~0.3mm.
5. low stress screw connection structure according to claim 4, it is characterised in that: the loading end (11) of external screw thread (13)
For an inclined-plane, inclination angle α, α=3~5 °, the loading end of internal screw thread (12) corresponding with loading end (11) of external screw thread (13)
(3) it is made of the circular arc that radius is R, R=50~60mm, the loading end (3) of internal screw thread (12) and the loading end of external screw thread (13)
It is tangent at pitch diameter of thread line (7).
6. low stress screw connection structure according to claim 5, it is characterised in that: the loading end (11) of external screw thread (13)
It is connect between tooth top (10) by the intermediate incline at one 45 ° of inclination angles, the lower end of the intermediate incline is away from the distance of tooth top (10)
H4, h4=0.2 ± 0.05mm.
7. low stress screw connection structure according to claim 5, it is characterised in that: inclination alpha and angle of inclination beta, tilt angle gamma
Inclined direction is consistent.
8. low stress screw connection structure according to claim 1, it is characterised in that: after internal and external screw thread engagement, internal screw thread
Tooth top (6) and external screw thread bottom of the tooth (8) between be kept in contact, and between the bottom of the tooth (4) of internal screw thread and externally threaded tooth top (10)
There are the gaps of 0.05~0.1mm.
9. low stress screw connection structure according to claim 8, it is characterised in that: a height of h of the tooth of the internal screw thread1, h1
=1.4~1.6mm, the externally threaded a height of h of tooth3, the high h of the tooth of internal screw thread1It is h higher than externally threaded tooth3High 0.05~0.1mm,
The distance of the tooth top (6) of the internal screw thread to pitch diameter of thread line (7) is h=1/2h3, the externally threaded bottom of the tooth (8) to outer spiral shell
The distance of the middle line (7) of line is also h=1/2h3。
10. low stress screw connection structure according to claim 8, it is characterised in that: after internal and external screw thread engagement, interior spiral shell
It is kept in contact between line loading end (3) and external screw thread loading end (11), and internal screw thread guide surface (5) and external screw thread guide surface (9)
Between there is also the gaps of 0.05~0.1mm.
11. low stress screw connection structure according to claim 1, it is characterised in that: the bottom of the tooth of the internal screw thread (12)
(4) bottom of the tooth (8) and tooth top (10) with tooth top (6) and the external screw thread (13) are each parallel to tubing and casing axis (14).
12. low stress screw connection structure according to claim 1, it is characterised in that: internal screw thread (12) and external screw thread
It (13) is taper pipe thread, taper is 1:16~1:18.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810558246.9A CN108952594A (en) | 2018-06-01 | 2018-06-01 | A kind of low stress screw connection structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810558246.9A CN108952594A (en) | 2018-06-01 | 2018-06-01 | A kind of low stress screw connection structure |
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| CN108952594A true CN108952594A (en) | 2018-12-07 |
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| CN201810558246.9A Pending CN108952594A (en) | 2018-06-01 | 2018-06-01 | A kind of low stress screw connection structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109505531A (en) * | 2018-12-26 | 2019-03-22 | 中国石油天然气集团有限公司 | A kind of threaded collar joint |
| CN112761539A (en) * | 2021-01-05 | 2021-05-07 | 中国石油天然气集团有限公司 | Anti-shearing airtight threaded joint |
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| CN203978314U (en) * | 2014-07-21 | 2014-12-03 | 中国石油化工股份有限公司 | A kind of special hermetic seal casing joint for low-permeability oil deposit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109505531A (en) * | 2018-12-26 | 2019-03-22 | 中国石油天然气集团有限公司 | A kind of threaded collar joint |
| CN109505531B (en) * | 2018-12-26 | 2020-09-04 | 中国石油天然气集团有限公司 | Threaded coupling |
| CN112761539A (en) * | 2021-01-05 | 2021-05-07 | 中国石油天然气集团有限公司 | Anti-shearing airtight threaded joint |
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