CN103696704B - Bidentate type hermetic seal screw thread - Google Patents
Bidentate type hermetic seal screw thread Download PDFInfo
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- CN103696704B CN103696704B CN201310580629.3A CN201310580629A CN103696704B CN 103696704 B CN103696704 B CN 103696704B CN 201310580629 A CN201310580629 A CN 201310580629A CN 103696704 B CN103696704 B CN 103696704B
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Abstract
The present invention relates to oil drilling tools and connect hermetically-sealed construction, be specially a kind of bidentate type hermetic seal screw thread<b>.</b>Feature is that 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, SPL shape; Described external screw thread convex sealing surface engages with internal thread arcs of recesses sealing surface. 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.
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, current oil exploitationThe direction of extraction of field forward deep-well, ultradeep well, high-pressure oil-gas well, thick oil thermal extraction, directional well etc. progressively develops, thus to stoneSealing between oil-piping and pipe has proposed more and more harsher technical requirement. A large amount of API (American Petroleum Institute (API)) that use in the pastThe numeric type coarse thread joint of standard all can not meet well exploitation aspect gas tightness, bonding strength and corrosion resistanceThe demand of the severe Oil/gas Well of environmental condition. Force people to remove to research and develop performance screw thread Premium connection and close more reliablySeal structure.
Current domestic deep-well and super dark oil well quantity are increasing, and what the special oil pipe thread of non-API standard connected makesConsumption increases gradually. But drilling tool thread fracture, screw thread have while stinging the accidents such as leakage and screw thread dropout in the real world applications in oil fieldOccur, brought huge economic loss to drilling team's construction. This wherein, due to not tight the caused oil field of seal with screwed jointThe leakage of associated gas can bring serious accident potential. This be because, in the oil-gas mining process of deep-well, ultradeep well, due toThread seal is not tight, and the combustible gas cognition of leakage spreads and assembles along the place of the borehole wall or geological stratification weakness, andOil mining mouth or away from the weak local eruption suddenly that forms of the geology of oil well, if run into naked light, also can cause burning orBlast, more fearful, gas leakage is often unpredictable in the diffusion aggregation place of geological stratification, therefore, this due to spiral shellThe not tight caused Leakage Gas of line 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 rupture.
Due to the operating mode very severe of deep-well and high-pressure gas well, down-hole body need to stand distortion, extruding, stretching, high temperatureThe adverse circumstances tests such as high pressure, by the analysis to pipe joint screw thread accident in oil mining scene with to the various pipes that are sealed and matchedThe finite element analysis of joint screw thread shows, sealing surface stress is excessive is one of reason producing plastic deformation and scuffing, secondly, byThe elastic-plastic deformation occurring during in interference fit in down-hole complex working condition lower sealing surface lacks deformation Free up Memory or does not have at allDeformation Free up Memory is set, also can causes the indivedual positions of sealing surface that plastic deformation 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 in screw thread teethReprocess the technology of tiny sealing thread, ensure the requirement of Small Taper sealing. The syndeton using at present, for being threaded, is boredPost service load is all to rely on drilling rod, drill collar, centralizer, the external pipe thread of coring down to transmit by root, so threaded jointsPosition just becomes an area of stress concentration, and good being threaded should be able to be resisted quick and various rotary bending moment, reducesFatigue rate, be out of shape little, adeciduate object. The form of thread of the triangle thread type of attachment 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 only6000～20000N.m; Number of patent application is the threaded connection drill stem of 200420078613.9 records, has proposed screw thread for partially terracedShape screw 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 conditions, as permanent freezing layer, sandy soils rock, middle hard placeIn layer, 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 formation condition, and the easy damage of conventional drilling tool thread connecting portion and oil gas are closeThe technical problem that envelope lost efficacy, 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 taper threeThe internal thread of dihedral, external screw thread; Internal thread is provided with arcs of recesses sealing surface, is provided with convex sealing surface on external screw thread, described inConvex sealing surface is the convex sealing surface of ellipse arc, parabolic arc or SPL shape; Described external screw thread convexSealing surface engages with internal thread arcs of recesses sealing surface.
Specifically taper triangle thread tooth form angle is 60 °, and internal and external screw thread has respectively three grades of sealing surfaces: circular bead surface,The seal groove R that end face has 15 ° of pyramidal plane sealings, tooth side surface convex sealing surface and arcs of recesses sealing surfaces to form0 -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 the limit twisting resistance that makes screw threadSquare reaches 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; At pipeBody internal and external screw thread tooth form side is provided with concave, convex arc sealing surface, and when upper button, the concave, convex arc sealing surface of body is close from line contactFengkai begins progressively to realize interference fit, is different from other seal form, and the line contact interference fit between this sealing surface is passableThe overall stressing conditions of sealing surface is greatly improved; The object of this requirement be for deep-well complex working condition and groundOnce under matter environment, sealing surface has formed the Free up Memory being out of shape after producing distortion between these two sections of geometric spaces, plays protectionSealing 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. Of the present invention excellentPoint be: 1, joint bonding strength is high, can mate with body equal strength, even have higher than body, be applicable to deep-well, super darkWell; 2, bending resistance is strong, is applicable to inclined shaft, extended reach well and horizontal well; 3, upper button is easy, and detain on can be fast and be difficult for thread alternating,Be 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 damageScrew 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 past Suo Binsike and sheThe Wei Erhenie Jones in your Ci Ke state, storehouse gram, Ke Weikejin and the republican Ta Lagansike of Saha, just Yang Jinsike, in richThe drilling pipe connecting thread structure using in the oil gas field probings such as Tu Aobinsike, middle Wei Liuyisike, middle Qiong Gesike can onlyIn being 10500N.m～18000N.m, torsional moment uses. Client, with the airproof special thread drilling tool of Liao Wo company, bores nowWhen torsional moment while entering is up to 32000N.m, without more renewing pipe.
Brief description of the drawings
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
Fig. 5 is the processing parameter map of form of thread.
Detailed description of the invention
Drilling tool as schematically shown in Figure 1, two ends are respectively male joint, female joint; Described male joint, female joint is bidentate type gasSealing thread, meaning 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 is60 °, internal and external screw thread has respectively three grades of sealing surfaces: circular bead surface, end face have 15 ° of pyramidal plane sealings, the sealing of tooth side surface convexThe seal groove R that face and arcs of recesses sealing surface form0 -0.02And R+0.02 0, the tooth height of screw thread is 3.095mm tooth top width 1.66mm, spiral shellApart from 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, now external screw threadLarge footpath and to only have 0.032～0.068mm(standard be 0.10～0.30mm the gap in the large footpath of internal thread)
Taking structure shown in Fig. 1,2,3 as example, this torque resistant greatest limit computational analysis that is threaded:
In drilling tool connecting thread, due to the effect of torque wrench moment, make connecting thread pretension, and produce pretightning force F, withTime, 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 frictional forceSquare。
Moment of torsion:
⑴
Mm (warp in screw thread)
2.97 ° (lead angle)
° (being screw thread axial cross section tooth form angle)
(friction factor between screw thread pair)
(friction factor between coupling face)
Mm (being the equivalent diameter of the effective contact area of screw thread shoulder end face)
9.828 ° (equivalent friction angle calculates)
25.4mm (helical pitch)
Conventionally regulation, the pretension stress of tightening rear thread connector must not exceed the yield limit of its material80%.Drilling tool material yield intensity is:
Get factor of safety 1.2, need to use stress
The area of internal thread dangerouse cross-section,
=71.4mm(simplifies pore diameter)
=165.1mm (diameter of pipe)
Pretightning force gas thread bonding strength calculates
Dangerouse cross-section tensile stress is
Dangerouse cross-section shearing stress in torsion power is:
=8.75 (being internal thread average thickness)
R=77.25 (being internal thread mean radius)
Because the material of pipe is plasticity, thus can be 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 (1)
1. a bidentate type hermetic seal screw thread, drilling tool body two ends are respectively the leg-of-mutton internal thread of taper, external screw thread; Its featureBe: internal thread is provided with arcs of recesses sealing surface, be provided with convex sealing surface on external screw thread, described convex sealing surface is ellipseThe convex sealing surface of circular arc, parabolic arc or SPL shape; Described external screw thread convex sealing surface and internal thread are recessedArc sealing surface engagement, described taper triangle thread tooth form angle is 60 °, internal and external screw thread has respectively three grades of sealing surfaces: platformThe seal groove R that shoulder face, end face have 15 ° of pyramidal plane sealings, tooth side surface convex sealing surface and arcs of recesses sealing surfaces to form0 -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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310580629.3A CN103696704B (en) | 2013-11-19 | 2013-11-19 | Bidentate type hermetic seal screw thread |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310580629.3A CN103696704B (en) | 2013-11-19 | 2013-11-19 | Bidentate type hermetic seal screw thread |
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| CN103696704A CN103696704A (en) | 2014-04-02 |
| CN103696704B true CN103696704B (en) | 2016-06-15 |
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| CN201310580629.3A Active CN103696704B (en) | 2013-11-19 | 2013-11-19 | Bidentate type hermetic seal screw thread |
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Families Citing this family (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 |
| EP3536894B1 (en) * | 2018-03-09 | 2020-10-14 | Sandvik Mining and Construction Tools AB | Coupling for connecting downhole tubulars |
| 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 |
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| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3700108B2 (en) * | 1998-04-13 | 2005-09-28 | 株式会社メタルワン | Threaded joint for oil well pipe |
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2013
- 2013-11-19 CN CN201310580629.3A patent/CN103696704B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN103696704A (en) | 2014-04-02 |
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