CN103696704A - Dual-tooth-form gas-tight thread - Google Patents
Dual-tooth-form gas-tight thread Download PDFInfo
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- CN103696704A CN103696704A CN201310580629.3A CN201310580629A CN103696704A CN 103696704 A CN103696704 A CN 103696704A CN 201310580629 A CN201310580629 A CN 201310580629A CN 103696704 A CN103696704 A CN 103696704A
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Abstract
The invention relates to a connecting sealing structure for a petroleum drilling tool, in particular to a dual-tooth-form gas-tight thread. The dual-tooth-form gas-tight thread is characterized in that an inner thread is provided with a concave-arc sealing surface; an outer thread is provided with a convex-arc sealing surface; the convex sealing surface is an elliptic arc, parabolic arc or spline-shaped convex-arc sealing surface; the convex-arc sealing surface of the outer thread is meshed with the concave-arc sealing surface of the inner thread. The connecting sealing structure has the advantages that 1, a joint is high in connecting strength, can be matched with a tube body at equal strength, is even higher than the tube body at certain times, and is suitable for deep wells and super deep wells; 2, the bending resistance grade is 3+, so that the connecting sealing structure is suitable for deviated wells, large-displacement wells and horizontal wells; 3, buckling can be performed easily and rapidly without causing any error, so that the connecting sealing structure is suitable for drilling operation in severe environments of deserts, sea and the like; 4, the anti-sticking performance is high, and buckling and detachment can be performed without damaging the threads; 5, the excessive torque resistance is high.
Description
Technical field
The present invention relates to oil drilling tools and connect hermetically-sealed construction, be specially a kind of bidentate type hermetic seal screw thread
.
Background technology
Along with the world is to sharply riseing of fossil energy demand and reducing year by year of oil allowable exploitation, the direction of extraction of current field of petroleum exploitation forward deep-well, ultradeep well, high-pressure oil-gas well, thick oil thermal extraction, directional well etc. progressively develops, and thus the sealing between petroleum pipeline and pipe has been proposed to more and more harsher technical requirements.The numeric type coarse thread joint of a large amount of API (American Petroleum Institute (API)) standards of using all can not meet the demand of the Oil/gas Well of mining environment inclement condition well aspect gas tightness, bonding strength and corrosion resistance in the past.Force people to remove to research and develop performance screw thread Premium connection and hermetically-sealed construction more reliably.
Current domestic deep-well and super dark oil well quantity are increasing, and the use amount that the special oil pipe thread of non-API standard connects increases gradually.Yet the accidents such as drilling tool thread fracture in the real world applications in oil field, the leakage of screw thread thorn and screw thread dropout happen occasionally, and to drilling team's construction, have brought huge economic loss.This wherein, because the leakage of not tight the caused associated gas of seal with screwed joint can bring serious accident potential.This be because, in the oil-gas mining process of deep-well, ultradeep well, because thread seal is not tight, the combustible gas cognition of leaking spreads and assembles along the place of the borehole wall or geological stratification weakness, and erupt at oil mining mouth or away from weak local the formation suddenly of geology of oil well, if run into naked light, also can cause burning or blast, more fearful is, gas leakage is often unpredictable in the diffusion aggregation place of geological stratification, therefore, this because the not tight caused Leakage Gas of screw thread hermetic seal is definitely unallowed.
Drilling tool failure accident great majority occur in threaded joints and sealing surface place, are substantially divided into several types below: (I) drilling tool thread fracture; (2) seal failure; (3) thread gluing: (4) slippage; (5) torque shoulder and thread surface scratch; (6) fatigue failure.
Operating mode very severe due to deep-well and high-pressure gas well, down-hole body need to stand distortion, extruding, stretch, the adverse circumstances tests such as HTHP, by to the analysis of pipe joint screw thread accident in oil mining scene with the finite element analysis of the various pipe joint screw threads that are sealed and matched is shown, sealing surface stress is excessive is one of reason producing plastic strain and scuffing, secondly, the elastic-plastic deformation occurring when the interference fit due to down-hole complex working condition lower sealing surface lacks deformation Free up Memory or deformation Free up Memory is not set at all, also can cause the indivedual positions of sealing surface that plastic strain occurs, cause scuffing and the leakage of sealing surface.
Past thread seal is generally realized by the interlock of tapering and circular bead surface.We have designed a kind of technology of reprocessing tiny sealing thread in screw thread teeth, guarantee the requirement of Small Taper sealing.The syndeton of using is at present for being threaded, drill string service load is all to rely on drilling rod, drill collar, centralizer, the external pipe thread of coring down to transmit by root, so screw connection point just becomes an area of stress concentration, good being threaded should be able to be resisted quick and various rotary bending moment, reduce fatigue rate, be out of shape little, adeciduate object.The form of thread of the triangle thread type of attachment of using at present, antitorque moment=5370N.m.As schematically shown in Figure 5, also having the patent No. is the zigzag joint described in 200910147891.2, and its antitorque moment is only 6000～20000N.m; Number of patent application is the threaded connection drill stem of 200420078613.9 records, and having proposed screw thread is buttress thread, trapezoidal thread, angular thread.The patent No. is the buttress thread of 200820056719.7 announcements.
The screw thread of this conventional type is under some special geological conditionss, and in permanent freezing layer, sandy soils rock, medium ground, performance is not very good, does not often reach target depth drilling tool thread connecting portion and has just damaged.
Summary of the invention
The present invention is in order to solve under special bottom condition, and the technical problem of the easy damage of conventional drilling tool thread connecting portion and oil gas seal failure, provides a kind of bidentate type hermetic seal screw thread that drilling tool connects that is applicable to.
Technical scheme of the present invention is, a kind of bidentate type hermetic seal screw thread, and described drilling tool body two ends are respectively the leg-of-mutton internal thread of taper, external screw thread; Internal thread is provided with arcs of recesses sealing surface, is provided with convex sealing surface on external screw thread, and described male seal face is the convex sealing surface of ellipse arc, parabolic arc, spline curve shape; Described external screw thread convex sealing surface and the engagement of internal thread arcs of recesses sealing surface.
Specifically taper triangle thread tooth form angle is 60 °, and internal and external screw thread has respectively and has three grades of sealing surfaces: the seal groove R that circular bead surface, end face have 15 ° of pyramidal plane sealings, tooth side surface convex sealing surface and arcs of recesses sealing surfaces to form
0 -0.02and R
+ 0.02 0; , the tooth height of screw thread is 3.095mm tooth top width 1.66mm, pitch 4 tooth/inches, tapering 1:6, seal groove R=0.5mm.
Helicitic texture of the present invention, has the function of high antitorque moment, and its characteristic is to make the limit antitorque moment of screw thread reach 45000N.m.
Body of the present invention two ends are provided with taper triangle internal and external screw thread, and the pitch diameter of thread of the two is parallel to each other; In body internal and external screw thread tooth form side, be provided with concave, convex arc sealing surface, during upper button, the concave, convex arc sealing surface of body starts progressively to realize interference fit from line contact sealing, be different from other seal form, the line contact interference fit between this sealing surface can be so that the whole stressing conditions of sealing surface be greatly improved; Once the object of this requirement is in order to have formed the Free up Memory of distortion after the generation of sealing surface under deep-well complex working condition and geological environment distortion between these two sections of geometric spaces, to have played protection sealing surface and the object that realizes effective sealing.
Screw threads of petroleum drilling tools syndeton of the present invention has high torque resistant and multi-stage sealed function.Advantage of the present invention is: 1, joint bonding strength is high, can mate with body equal strength, even have higher than body, be applicable to deep-well, ultradeep well; 2, bending resistance is strong, is applicable to inclined shaft, extended reach well and horizontal well; 3, upper button is easy, detains and is difficult for thread alternating on can be fast, is applicable to the drillng operation under desert, the first-class adverse circumstances in ocean; 4, anti-stick button performance is good, can repeatedly go up shackle and not damage screw thread; It is 5, anti-that torque capability is strong excessively.
This kind of drilling tool product is mainly for Russia client, and client's reflection is good: in the Wei Erhenie Jones in Suo Binsike and Irkutsk state gram, Ke Weikejin and the republican Ta Lagansike of Saha, the drilling pipe connecting thread structure just used in the oil gas field probing such as Yang Jinsike, middle Boyto Ao Binsike, middle Wei Liuyisike, middle Qiong Gesike, can only use in for 10500N.m～18000N.m in torsional moment in the past.The present airproof special thread drilling tool of client Yong Liaowo company, when the torsional moment while creeping into is up to 32000N.m, without more renewing pipe.
Accompanying drawing explanation
Fig. 1 is the structural representation of drilling tool of the present invention
Fig. 2 is female joint helicitic texture schematic diagram
Fig. 3 is male joint helicitic texture schematic diagram
Fig. 4 is male joint and female joint interlocking pattern figure.
The specific embodiment
Drilling tool as schematically shown in Figure 1, two ends are respectively male joint, female joint; Described male joint, female joint are bidentate type hermetic seal screw thread, anticipate as shown in Figure 2 and Figure 3, the screw thread of described male joint and female joint is taper triangle thread, tooth form angle is 60 °, and internal and external screw thread has respectively three grades of sealing surfaces: the seal groove R that circular bead surface, end face have 15 ° of pyramidal plane sealings, tooth side surface convex sealing surface and arcs of recesses sealing surfaces to form
0 -0.02and R
+ 0.02 0; , the tooth height of screw thread is 3.095mm tooth top width 1.66mm, pitch 4 tooth/inches, tapering 1:6, seal groove R=0.5mm.
As schematically shown in Figure 4, under pretightning force 9000N.m～12000N.m effect, screw thread pair closely spins, and now to only have 0.032～0.068mm(standard be 0.10～0.30mm in the gap in externally threaded large footpath and the large footpath of internal thread)
The structure shown in Fig. 1,2,3 of take is example, should
the computational analysis of the torque resistant that is threaded greatest limit:
In drilling tool connecting thread, due to the effect of torque wrench moment, make connecting thread pretension, and produce pretightning force F, meanwhile, due to the existence of pretightning force, make again to produce screw thread moment between the screw pair of connecting thread
, between end face, produce moment of friction
.
Moment of torsion:
2.97 ° (lead angle)
° (being screw thread axial cross section tooth form angle)
(friction factor between coupling face)
9.828 ° (equivalent friction angle calculates)
Conventionally stipulate, the pretension stress of tightening rear thread connector must not surpass the yield limit of its material
80%.Drilling tool material yield intensity is:
Get factor of safety 1.2, need to use stress
=71.4mm(simplifies pore diameter)
Pretightning force gas thread bonding strength calculates
Dangerouse cross-section tensile stress is
Dangerouse cross-section shearing stress in torsion power is:
R=77.25 (being internal thread mean radius)
Because the material of pipe is plasticity, therefore can, according to fourth strength theory, obtain the stress of gas thread under pretightning force:
Maximum pretightning force
=2814243.382N
Can try to achieve peak torque theoretical limit:
T=28.98275
=81.5645KN.m。
Claims (2)
1. a bidentate type hermetic seal screw thread, described drilling tool body two ends are respectively the leg-of-mutton internal thread of taper, external screw thread; It is characterized in that: internal thread is provided with arcs of recesses sealing surface, be provided with convex sealing surface on external screw thread, described male seal face is the convex sealing surface of ellipse arc, parabolic arc, spline curve shape; Described external screw thread convex sealing surface and the engagement of internal thread arcs of recesses sealing surface.
2. bidentate type hermetic seal screw thread according to claim 1, it is characterized in that: taper triangle thread tooth form angle is 60 °, internal and external screw thread has respectively three grades of sealing surfaces: the seal groove R that circular bead surface, end face have 15 ° of pyramidal plane sealings, tooth side surface convex sealing surface and arcs of recesses sealing surfaces to form
0 -0.02and R
+ 0.02 0; , the tooth height of screw thread is 3.095mm tooth top width 1.66mm, pitch 4 tooth/inches, tapering 1:6, seal groove R=0.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310580629.3A CN103696704B (en) | 2013-11-19 | 2013-11-19 | Bidentate type hermetic seal screw thread |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310580629.3A CN103696704B (en) | 2013-11-19 | 2013-11-19 | Bidentate type hermetic seal screw thread |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103696704A true CN103696704A (en) | 2014-04-02 |
| CN103696704B CN103696704B (en) | 2016-06-15 |
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ID=50358351
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310580629.3A Active CN103696704B (en) | 2013-11-19 | 2013-11-19 | Bidentate type hermetic seal screw thread |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108252660A (en) * | 2018-03-07 | 2018-07-06 | 上海海隆石油管材研究所 | A kind of high torque highly anti-fatigue type nipple |
| CN110761717A (en) * | 2019-10-30 | 2020-02-07 | 澳普洛钻探工具(无锡)有限公司 | External thread structure of sealing drill rod |
| CN112204223A (en) * | 2018-03-09 | 2021-01-08 | 山特维克矿山工程机械工具股份有限公司 | Coupling for connecting a down-the-hole pipe |
Citations (8)
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|---|---|---|---|---|
| JPH11294650A (en) * | 1998-04-13 | 1999-10-29 | Nkk Corp | Threaded joint for oil well pipe |
| CN1355876A (en) * | 1999-04-23 | 2002-06-26 | 约翰·甘迪公司 | Thread form with multifaceted flanks |
| CN201412076Y (en) * | 2009-06-09 | 2010-02-24 | 江苏胜大石油设备制造有限公司 | Oil sleeve connector |
| CN201474625U (en) * | 2009-08-20 | 2010-05-19 | 宝山钢铁股份有限公司 | Ultrahigh anti-torsion metal air-tight seal drill pipe joint |
| CN201671558U (en) * | 2010-04-23 | 2010-12-15 | 无锡西姆莱斯石油专用管制造有限公司 | Metal spherical sealing double-shoulder oil drill rod connector |
| CN102428245A (en) * | 2009-05-20 | 2012-04-25 | 瓦卢莱克曼内斯曼油气法国公司 | Threated connection for drilling and operating hydrocarbon wells |
| CN102639912A (en) * | 2009-11-30 | 2012-08-15 | 瓦卢莱克曼内斯曼油气法国公司 | Threaded connection |
| CN103216197A (en) * | 2013-04-28 | 2013-07-24 | 江苏曙光石油钻采设备有限公司 | Fast-rotation type oil drill rod joint thread reinforcing structure |
-
2013
- 2013-11-19 CN CN201310580629.3A patent/CN103696704B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11294650A (en) * | 1998-04-13 | 1999-10-29 | Nkk Corp | Threaded joint for oil well pipe |
| CN1355876A (en) * | 1999-04-23 | 2002-06-26 | 约翰·甘迪公司 | Thread form with multifaceted flanks |
| CN102428245A (en) * | 2009-05-20 | 2012-04-25 | 瓦卢莱克曼内斯曼油气法国公司 | Threated connection for drilling and operating hydrocarbon wells |
| CN201412076Y (en) * | 2009-06-09 | 2010-02-24 | 江苏胜大石油设备制造有限公司 | Oil sleeve connector |
| CN201474625U (en) * | 2009-08-20 | 2010-05-19 | 宝山钢铁股份有限公司 | Ultrahigh anti-torsion metal air-tight seal drill pipe joint |
| CN102639912A (en) * | 2009-11-30 | 2012-08-15 | 瓦卢莱克曼内斯曼油气法国公司 | Threaded connection |
| CN201671558U (en) * | 2010-04-23 | 2010-12-15 | 无锡西姆莱斯石油专用管制造有限公司 | Metal spherical sealing double-shoulder oil drill rod connector |
| CN103216197A (en) * | 2013-04-28 | 2013-07-24 | 江苏曙光石油钻采设备有限公司 | Fast-rotation type oil drill rod joint thread reinforcing structure |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108252660A (en) * | 2018-03-07 | 2018-07-06 | 上海海隆石油管材研究所 | A kind of high torque highly anti-fatigue type nipple |
| CN112204223A (en) * | 2018-03-09 | 2021-01-08 | 山特维克矿山工程机械工具股份有限公司 | Coupling for connecting a down-the-hole pipe |
| CN110761717A (en) * | 2019-10-30 | 2020-02-07 | 澳普洛钻探工具(无锡)有限公司 | External thread structure of sealing drill rod |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103696704B (en) | 2016-06-15 |
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