CN102296935A - High-antitorque moment threaded connecting structure for outer coring pipes - Google Patents
High-antitorque moment threaded connecting structure for outer coring pipes Download PDFInfo
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- CN102296935A CN102296935A CN2011102160957A CN201110216095A CN102296935A CN 102296935 A CN102296935 A CN 102296935A CN 2011102160957 A CN2011102160957 A CN 2011102160957A CN 201110216095 A CN201110216095 A CN 201110216095A CN 102296935 A CN102296935 A CN 102296935A
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Abstract
The invention relates to a connecting structure for outer coring pipes, in particular to a high-antitorque moment threaded connecting structure for the outer coring pipes. The invention solves the technical problem that under special bottom layer conditions, the conventional threaded connecting part of a drill stem can be easily damaged. Screw threads of the multi-point hyperpressure threaded connecting structure of the drill stem are isosceles trapezoid-shaped screw threads, the mesas of both sides of each screw thread are at the angle of 15 degrees, the height of thread of each screw thread is 2.2mm, the width of the crest of thread is 3.66mm, the thread pitch is three threads per inch, and the taper is 1:32. The technical scheme is named type 30 special screw thread by the invention, and the high-antitorque moment threaded connecting structure has a high-antitorque moment function, and is characterized in that the ultimate antitorque moment of the screw thread reaches 45000N.m.
Description
Technical field
The present invention relates to a kind of syndeton of the outer tube of coring, be specially the high torque resistant screw connection structure of a kind of outer tube of coring.
Background technology
Oil drill rocker is one of key tool of the probing abandoned wells or the natural gas well, and in work progress, drilling rod is by continuous connection lengthening drill bit to be goed deep in the bottom.The service condition of OCTG is very complicated, the coupling part of drilling rod just becomes probing key of success factor, the moment of torsion of whole rig all is to transmit by the coupling part, geological condition complexity in the bottom particularly, great majority are to work under hidden environment, what remarkable difference is arranged with other machineries is that Service Environment is taking place to change whenever and wherever possible, and great uncertainty is promptly arranged.(1) geological environment: influence the geological conditions of drilling well, alternately geological phenomenon such as appearance of different pressures system is arranged on salt deposit, undercompaction mud stone layer, high steep dip formation fracture solution cavity development belt, fracture zone of fracture, abnormal pressure band, the section.Cause a series of complex environment to drilling engineering.(2) corrosive medium: to the maximum environmental activity of OCTG harm is corrosion, and modal corrosion is H
2S, CO
2And oxygen corrosion, when these three kinds of corrosive medium compound actions, corrode even more serious, Cl
-Existence can make corrosion aggravation.The interior high temperature and pressure of well and the effect of strong acid also are the factors that promotes corrosion.(3) stressed: drill string stressed very complicated and changeable, generally speaking, the various load that well head and shaft bottom drill string bear are all very big, drill string statics is comparatively ripe at present, and drill string kinetics still need develop and is perfect, moreover, development such as petroleum exploration and development forward ultradeep well, directional well, horizontal well, cluster well, the drill string of these harsh wells is stressed also to be emphasis of future research.
The syndeton of using all is to be threaded at present, the drill string service load all is by down transmitting with drilling rod by screw thread, 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, and reach not tired, indeformable, adeciduate order.Because the probing outer tube is structural, require to place the accessory of coring in managing, be to creep into the moment screw thread because the rock core outer tube connects between pipe fitting connection and transmission, it is inapplicable that conventional pipe connects screw thread.The form of using of being threaded has HD type rectangular thread tooth form as schematically shown in Figure 4, antitorque moment=5370N.m at present.The tapered thread tooth form that STD type is as schematically shown in Figure 5 arranged, this kind screw thread antitorque moment=1300N.m.Also having the patent No. is 200910147891.2 described zigzag joints, and number of patent application is the drilling rod that is threaded of 200420078613.9 records, and having proposed screw thread is buttress thread, trapezoidal thread, angular thread.The patent No. is the 200820056719.7 inclined ladder shape screw threads of announcing.
Above various product is under some special geological condition, and in permanent freezing layer, sand layer, middle hardcore, performance is not very good, does not often reach target depth drill rod 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 that conventional drill rod thread connecting portion damages easily provides a kind of drilling rod multiple spot superpressure screw connection structure.
Technical scheme of the present invention is, a kind of drilling rod multiple spot superpressure screw connection structure, and described screw thread is the isosceles trapezoid screw thread, the both sides table top of screw thread is 15 ° of angles, the tooth depth 2.2mm tooth top width 3.66mm of screw thread, pitch 3 tooth/inches, tapering 1:32.
It is 30 type special threads that the present invention names this technical scheme, and it has the function of high antitorque moment, and its characteristic is to make the limit antitorque moment of screw thread reach 45000N.m.
The steel material that uses is AISI4145H.
This kind rock core outer tube product mainly is at Russian state client, client's reflection is good: employed drilling pipe connecting thread structure can only be used in torsional moment is 12000N.m～22000N.m in Wei Erhenie Jones gram, Ke Weikejin and the republican Ta Lagansike of Saha in Suo Binsike and Irkutsk state, proper Yang Jinsike, middle Boyto Ao Binsike, oil gas fields probings such as middle Wei Liuyisike, middle Qiong Gesike in the past, otherwise, must more renew the rock core outer tube.The client has used the 30 type special thread outer tubes that the technology of the present invention is manufactured now, when the torsional moment when creeping into is up to 45000N.m, need not more to renew pipe.As: the probing of October 22 at No. 12 wells of oil gas fields such as Qiong Gesike in 2010, fatigue fracture does not still appear in the connecting thread of rock core outer tube when creeping into 5043 meters.
Description of drawings
Fig. 1 is the outer tube structure schematic diagram of coring of the present invention
Fig. 2 is the partial enlarged drawing of Fig. 1
Fig. 3 is a respective outer side edges junctor composition of the present invention
Fig. 4 is one of existing screw connection structure
Fig. 5 is two of an existing screw connection structure.
The specific embodiment
As schematically shown in Figure 1, a kind of drilling rod outer tube of coring, two ends are respectively male joint, female joint; Described male joint, female joint are for being threaded, as schematically shown in Figure 2, syndeton is a drilling rod multiple spot superpressure screw connection structure, the screw thread of described male joint and female joint is the isosceles trapezoid screw thread, the both sides table top of screw thread is 15 ° of angles, the tooth depth 2.2mm tooth top width 3.66mm of screw thread, pitch 3 tooth/inches, tapering 1:32.
As schematically shown in Figure 3, screw thread pair closely spins under pretightning force 9000N.m～12000N.m effect, and this moment, to have only 0.032～0.068mm(standard with the gap in the big footpath of internal thread be 0.10～0.30mm) in externally threaded big footpath
With structure shown in Figure 1 is example, this torque resistant greatest limit computational analysis that is threaded:
In the joint connecting thread, because the effect of torque wrench moment makes the connecting thread pretension, and produce pretightning force F, simultaneously, because the existence of pretightning force, make again between the screw pair of connecting thread and produce screw thread moment
, produce moment of friction between the end face
Moment of torsion:
Mm (being the equivalent diameter of the effective contact area of screw thread shoulder end face)
° 9.828 (equivalent friction angle calculates)
25.48 mm (helical pitch)
Usually stipulate that the pretension stress of tightening the rear thread connector must not surpass the yield limit of its material
80%.Metal material
AISI4145HYield strength is:
Get factor of safety 1.2, then need use stress
=172mm (diameter of pipe)
By formula
⑴+⑵Draw: T=28.98275
Pretightning force gas thread bonding strength calculates
The dangerouse cross-section tensile stress is
Dangerouse cross-section shearing stress in torsion power is:
R=77.25 (being the internal thread mean radius)
Because the material of pipe is a plasticity, so can obtain the stress of gas thread under pretightning force according to fourth strength theory:
Maximum pretightning force
=2814243.382N
Can try to achieve the peak torque theoretical limit:
T=28.98275
=81.5645KN.m。
Claims (1)
1. drilling rod multiple spot superpressure screw connection structure, described screw thread is the isosceles trapezoid screw thread, the both sides table top of screw thread is 15 ° of angles, the tooth depth 2.2mm tooth top width 3.66mm of screw thread, pitch 3 tooth/inches, tapering 1:32.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102160957A CN102296935A (en) | 2011-07-30 | 2011-07-30 | High-antitorque moment threaded connecting structure for outer coring pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102160957A CN102296935A (en) | 2011-07-30 | 2011-07-30 | High-antitorque moment threaded connecting structure for outer coring pipes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102296935A true CN102296935A (en) | 2011-12-28 |
Family
ID=45357590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102160957A Pending CN102296935A (en) | 2011-07-30 | 2011-07-30 | High-antitorque moment threaded connecting structure for outer coring pipes |
Country Status (1)
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|---|---|
| CN (1) | CN102296935A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032031A (en) * | 2012-12-25 | 2013-04-10 | 江苏和信石油机械有限公司 | 14-3/4-inch extra-large-caliber prospecting drill rod thread structure |
| CN111794694A (en) * | 2020-07-18 | 2020-10-20 | 邹城兖矿泰德工贸有限公司 | Connector with a locking member |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB786652A (en) * | 1954-03-16 | 1957-11-20 | Bataafsche Petroleum | Improvements in or relating to tapering box-and-pin-type threaded couplings |
| CN2755266Y (en) * | 2004-08-10 | 2006-02-01 | 陆晓玲 | Screw connecting drill rod |
| CN201056991Y (en) * | 2007-06-20 | 2008-05-07 | 中国海洋石油总公司 | Special screwed joint of petroleum sleeve pipe |
| CN201372739Y (en) * | 2008-10-29 | 2009-12-30 | 西安摩尔石油工程实验室 | Special screw thread connecting device suitable for radial expanding deformation oil casing pipe |
| CN201448065U (en) * | 2009-08-31 | 2010-05-05 | 江阴德玛斯特钻具有限公司 | Double-step integral drill stem |
-
2011
- 2011-07-30 CN CN2011102160957A patent/CN102296935A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB786652A (en) * | 1954-03-16 | 1957-11-20 | Bataafsche Petroleum | Improvements in or relating to tapering box-and-pin-type threaded couplings |
| CN2755266Y (en) * | 2004-08-10 | 2006-02-01 | 陆晓玲 | Screw connecting drill rod |
| CN201056991Y (en) * | 2007-06-20 | 2008-05-07 | 中国海洋石油总公司 | Special screwed joint of petroleum sleeve pipe |
| CN201372739Y (en) * | 2008-10-29 | 2009-12-30 | 西安摩尔石油工程实验室 | Special screw thread connecting device suitable for radial expanding deformation oil casing pipe |
| CN201448065U (en) * | 2009-08-31 | 2010-05-05 | 江阴德玛斯特钻具有限公司 | Double-step integral drill stem |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032031A (en) * | 2012-12-25 | 2013-04-10 | 江苏和信石油机械有限公司 | 14-3/4-inch extra-large-caliber prospecting drill rod thread structure |
| CN111794694A (en) * | 2020-07-18 | 2020-10-20 | 邹城兖矿泰德工贸有限公司 | Connector with a locking member |
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Application publication date: 20111228 |