CN102926674A - Low pressure gas seal special screwed joint - Google Patents
Low pressure gas seal special screwed joint Download PDFInfo
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- CN102926674A CN102926674A CN2011102296162A CN201110229616A CN102926674A CN 102926674 A CN102926674 A CN 102926674A CN 2011102296162 A CN2011102296162 A CN 2011102296162A CN 201110229616 A CN201110229616 A CN 201110229616A CN 102926674 A CN102926674 A CN 102926674A
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Abstract
The invention discloses a low pressure gas seal special screwed joint, and belongs to the field of oil development. The bearing surface angle alpha of the screwed joint is 3-30 degrees, the guiding surface angle beta is 30-45 degrees, the tooth crest (bottom) arc radius R is 0.38-0.42mm, the tooth socket width B1 is 1.3-1.5mm, the tooth ridge width B2 is 1.6-1.8mm, the tooth height is 1.9-2.2mm, and the screw pitch N is 6-8 teeth per inch. The economic gas seal special screwed joint can be quickly screwed on and bear large bending load and tensile load, and completely meets a requirement for economic and high-efficiency development of low pressure low permeability gas field.
Description
Technical field
The present invention relates to nipple, particularly a kind of low pressure air-sealed special threaded joint.
Background technology
China's low pressure gas field area is large, and particularly some gas fields of western part of China have significant low pressure and low permeability characteristics.Low pressure (reservoir pressure is less than 35MPa), hypotonic depositional trap gas reservoir, well yield is low, this gas field of effective exploitation only has by many drilling wells, and sleeve pipe proportion in shaft building is larger, therefore selecting to satisfy the cheap nipple that can realize again hermetic seal in low pressure gas field, is the effective measures of reducing development cost.
At present, special-purpose helicitic texture has two kinds usually.
One, employing is with the Special threading connector sleeve pipe of shoulder and sealing surface, because the processing cost of this Special threading connector is API (American Petroleum Association, American Petroleum Institute) more than 2 of screw thread times, so the tubing string cost can't satisfy the economical and effective exploitation in above-mentioned gas field.
Its two, adopt after oval nipple adds the upper button of special thread fat (Catts101) among the API, just can not implement again the shackle operation and make-up speed slower.
Therefore, need that exploitation is a kind of can to guarantee the safe and effective exploitation of low-pressure gas well and economic Special threading connector, Here it is aim of the present invention place.
Summary of the invention
In order to solve the cost-effective development problem in low pressure gas field, the embodiment of the invention provides a kind of low pressure air-sealed special threaded joint, and described nipple had both had the effect that guarantees the safe and effective exploitation of low-pressure gas well, had advantages of again good economical benefit.Described technical scheme is as follows:
A kind of low pressure air-sealed special threaded joint, described nipple is male connection, the bearing surface angle [alpha] of described male connection=3 °～30 °, spigot surface angle beta=30 °～45 °, tooth top circular arc radius R=0.38mm～0.42mm, the wide B1=1.3mm～1.5mm of alveolus, the wide B2=1.6mm～1.8mm of dental ridge, high H=1.9mm～the 2.2mm of tooth, pitch N are per inch 6 teeth～8 teeth.
The embodiment of the invention also provides a kind of low pressure air-sealed special threaded joint, described nipple is female adapter, the bearing surface angle [alpha] of described female adapter=3 °～30 °, spigot surface angle beta=30 °～45 °, arc radius R=0.38mm～0.42mm at the bottom of the tooth, the wide B1=1.3mm～1.5mm of alveolus, wide B2=1.6mm～the 1.8mm of dental ridge, high H=1.9mm～the 2.2mm of tooth, pitch N are per inch 6 teeth～per inch 8 teeth, and internal thread becomes cone 0 and is 67mm/m～73mm/m.
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is: compared to existing technology, structure described in the embodiment of the invention forms and function sees Table 1.
Table 1 helicitic texture forms and function
| Symbol | Title | Function |
| α | Bearing surface angle (3～30 °) | Improve resistance to tension behind the upper button |
| β | Spigot surface angle (30～45 °) | The button guiding is stable in the assurance |
| R | Tooth top (end) arc radius (0.38～0.42mm) | Anti-stick button has the auxiliary seal effect simultaneously |
| B1 | Alveolus is wide by (1.3～1.5mm) | Thread alternating does not occur in easy make-up when detaining in the assurance |
| B2 | Dental ridge is wide by (1.6～1.8mm) | The rear bearing surface of button contacts with spigot surface in the assurance |
| H | Tooth is high by (1.9～2.2mm) | Improve tensile strength |
| O | Internal thread becomes cone (67～73mm/m) | Form effective sealed engagement |
| N | Pitch (per inch 6～8 teeth) | Intensity in the assurance under button and the tensile load |
In sum, the described nipple of the embodiment of the invention is compared with prior art mode one, without shoulder and independent sealed, but the design of adopting a button flank to seal, so it is low to have processing cost, economical with materials, advantage easy to detect, the described nipple of the embodiment of the invention is compared with prior art mode two, need not to add special thread fat, have upper button and shackle convenient, and on detain fast advantage, therefore, the present invention can realize fast upper button, bear the economical air-sealed special threaded joint than macrobending and tensile load, it satisfies the requirement of low pressure and low permeability gas field economical and efficient exploitation fully.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use was done to introduce simply during the below will describe embodiment, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structure chart that the described low pressure of the embodiment of the invention is used the air-sealed special threaded joint;
Fig. 2 is the structure chart that the described low pressure of another embodiment of the present invention is used the air-sealed special threaded joint;
Among the figure:
α bearing surface angle,
β spigot surface angle,
R tooth top (end) arc radius,
The B1 alveolus is wide,
The B2 dental ridge is wide,
The H tooth is high,
The O internal thread becomes cone.
The specific embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Embodiment 1
Referring to Fig. 1, the embodiment of the invention 1 described a kind of low pressure air-sealed special threaded joint, described nipple is male connection, the bearing surface angle [alpha] of described male connection=3 °～30 °, spigot surface angle beta=30 °～45 °, tooth top circular arc radius R=0.38mm～0.42mm, wide B1=1.3mm～the 1.5mm of alveolus, wide B2=1.6mm～the 1.8mm of dental ridge, the high H=1.9mm～2.2mm of tooth, pitch N are per inch 6 teeth～8 teeth.
During implementation, can according to the requirement of concrete operating mode, select this special thread sleeve pipe of different size.Adopt the processing technology same with the API screw thread during manufacturing.Wherein, box cupling and body are with grade of steel or a high grade of steel, and the API thread compound is evenly smeared at two ends during upper button, clamping box cupling middle part, and factory's end adopts on the peak torque to be detained, and on-the-spot end adopts on the best torque to be detained.
Referring to Fig. 1, the resistance to tension behind the upper button has been improved in bearing surface angle [alpha]=3 described in the embodiment of the invention 1 °～30 °; Spigot surface angle beta=30 °～45 °, the button guiding is stable in the assurance; Tooth top circular arc radius R=0.38mm～0.42mm has the auxiliary seal effect simultaneously at anti-stick button; Wide B1=1.3mm～the 1.5mm of alveolus, thread alternating does not occur in easy make-up when detaining in the assurance; Wide B2=1.6mm～the 1.8mm of dental ridge, the rear bearing surface of button contacts with spigot surface in the assurance; High H=1.9mm～the 2.2mm of tooth has improved tensile strength; Pitch N is per inch 6 teeth～per inch 8 teeth, the intensity in the assurance under button and the tensile load.
As seen, the described nipple of the embodiment of the invention is compared with prior art mode one, without shoulder and independent sealed, but the design of adopting a button flank to seal, so it is low to have processing cost, economical with materials, advantage easy to detect, the described nipple of the embodiment of the invention is compared with prior art mode two, need not to add special thread fat, have upper button and shackle convenient, and on detain fast advantage, therefore, the present invention can realize fast upper button, bear the economical air-sealed special threaded joint than macrobending and tensile load, it satisfies the requirement of low pressure and low permeability gas field economical and efficient exploitation fully.
Embodiment 2
Referring to Fig. 1, the embodiment of the invention 2 described a kind of low pressure air-sealed special threaded joints, described nipple is female adapter, the bearing surface angle [alpha] of described female adapter=3 °～30 °, spigot surface angle beta=30 °～45 °, arc radius R=0.38mm～0.42mm at the bottom of the tooth, wide B1=1.3mm～the 1.5mm of alveolus, wide B2=1.6mm～the 1.8mm of dental ridge, high H=1.9mm～the 2.2mm of tooth, pitch N is per inch 6 teeth～per inch 8 teeth, and referring to Fig. 2, internal thread becomes cone O and is 67mm/m～73mm/m.
During implementation, can according to the requirement of concrete operating mode, select this special thread sleeve pipe of different size.Adopt the processing technology same with the API screw thread during manufacturing.Wherein, box cupling and body be with grade of steel or a high grade of steel, internal thread phosphatization thickness 〉=20um, and the API thread compound is evenly smeared at two ends during upper button, clamping box cupling middle part, factory's end adopts on the peak torque to be detained, and on-the-spot end adopts on the best torque to be detained.
Referring to Fig. 1, the resistance to tension behind the upper button has been improved in bearing surface angle [alpha]=3 described in the embodiment of the invention 2 °～30 °; Spigot surface angle beta=30 °～45 °, the button guiding is stable in the assurance; Arc radius R=0.38mm～0.42mm at the bottom of the tooth has the auxiliary seal effect simultaneously at anti-stick button; Wide B1=1.3mm～the 1.5mm of alveolus, thread alternating does not occur in easy make-up when detaining in the assurance; Wide B2=1.6mm～the 1.8mm of dental ridge, the rear bearing surface of button contacts with spigot surface in the assurance; High H=1.9mm～the 2.2mm of tooth has improved tensile strength; Pitch N is per inch 6 teeth～per inch 8 teeth, the intensity in the assurance under button and the tensile load; Referring to Fig. 2, internal thread becomes cone O and is 67mm/m～73mm/m, forms effective sealed engagement.
In sum, the described nipple of the embodiment of the invention is compared with prior art mode one, without shoulder and independent sealed, but the design of adopting a button flank to seal, so it is low to have processing cost, economical with materials, advantage easy to detect, the described nipple of the embodiment of the invention is compared with prior art mode two, need not to add special thread fat, have upper button and shackle convenient, and on detain fast advantage, therefore, the present invention can realize fast upper button, bear the economical air-sealed special threaded joint than macrobending and tensile load, it satisfies the requirement of low pressure and low permeability gas field economical and efficient exploitation fully.
The verification experimental verification of nipple of the present invention is as follows:
Test basis:
" ISO:13679 petroleum industry recommendation-Special threading connector test evaluation program and method "
Western part of China low pressure gas field actual condition parameter
1) make-and-break test foundation
Buckle to run out of thread in the control of sample opsition dependent.Adopt API high pressure thread compound SHELL TYPE3 (the international standards organization standard generalized markup thread compound trade mark) in the test, smear evenly, make-up speed is less than 10rpm.
Sample is upward buckled through 3 times, 2 shackles, and the thread gluing phenomenon does not all occur, and experimental data sees Table 3.
Table 3 make-and-break test data
2) thermal cycle and combined load hermetic seal
To finishing the sample of make-and-break test, dried in 24 hours that carry out under 180 ℃ of the high temperature.Carry out subsequently thermal cycling test, test load sees Table 4, and leakage phenomenon does not all occur sample in the process of the test.
The interior pressure thermal cycling test of table 4
The test evaluation of combined load gas sealing ability.Test loads data and sees Table 5, VME (Mi Saisi combined stresses)=80% wall thickness and material name yield strength.Leakage phenomenon does not all occur in sample.
The test of table 5 combined load
3) ultimate failure load test
3 groups of samples are stretched to failure test, and result of the test sees Table 6, and tensile failure load all is higher than the oval thread gage definite value of API.
Table 6 is stretched to the failure test result
Be depressed into failure test in 2 groups of samples are carried out, pressure medium is water, and result of the test sees Table 7, and test pressure all is higher than the API setting.
Be depressed into the failure test result in the table 7
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. low pressure air-sealed special threaded joint, described nipple is male connection, it is characterized in that, the bearing surface angle [alpha] of described male connection=3 °～30 °, spigot surface angle beta=30 °～45 °, tooth top circular arc radius R=0.38mm～0.42mm, wide B1=1.3mm～the 1.5mm of alveolus, wide B2=1.6mm～the 1.8mm of dental ridge, the high H=1.9mm～2.2mm of tooth, pitch N are per inch 6 teeth～8 teeth.
2. low pressure air-sealed special threaded joint, described nipple is female adapter, it is characterized in that the bearing surface angle [alpha] of described female adapter=3 °～30 °, spigot surface angle beta=30 °～45 °, arc radius R=0.38mm～0.42mm at the bottom of the tooth, wide B1=1.3mm～the 1.5mm of alveolus, the wide B2=1.6mm～1.8mm of dental ridge, the high H=1.9mm～2.2mm of tooth, pitch N is per inch 6 teeth～per inch 8 teeth, and internal thread becomes cone O and is 67mm/m～73mm/m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110229616.2A CN102926674B (en) | 2011-08-11 | 2011-08-11 | Low pressure air-sealed special threaded joint |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110229616.2A CN102926674B (en) | 2011-08-11 | 2011-08-11 | Low pressure air-sealed special threaded joint |
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| CN102926674A true CN102926674A (en) | 2013-02-13 |
| CN102926674B CN102926674B (en) | 2015-12-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106761462A (en) * | 2016-12-27 | 2017-05-31 | 中国石油天然气集团公司 | A kind of oil well casing special nipple |
| CN111043413A (en) * | 2019-12-16 | 2020-04-21 | 中国石油天然气集团有限公司 | Threaded structure of threaded joint of PVC-lined steel pipe |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| HK1005320A1 (en) * | 1988-10-03 | 1998-12-31 | Dalmine Spa | Hermetic metal pipe joint |
| WO2002035128A2 (en) * | 2000-10-26 | 2002-05-02 | Dalmine S.P.A. | Threaded pipe joint |
| CN201496000U (en) * | 2009-08-20 | 2010-06-02 | 四川华工石油钢管有限责任公司 | Structure of hermetically sealed joint of oil pipe or sleeve |
| CN101806197A (en) * | 2010-03-26 | 2010-08-18 | 衡阳华菱连轧管有限公司 | Air-sealed saw-tooth threading connector and oil bushing and connecting hoop using same |
| CN201778676U (en) * | 2010-08-04 | 2011-03-30 | 宝山钢铁股份有限公司 | Low pressure-resistant air-tight seal sleeve joint |
-
2011
- 2011-08-11 CN CN201110229616.2A patent/CN102926674B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| HK1005320A1 (en) * | 1988-10-03 | 1998-12-31 | Dalmine Spa | Hermetic metal pipe joint |
| WO2002035128A2 (en) * | 2000-10-26 | 2002-05-02 | Dalmine S.P.A. | Threaded pipe joint |
| CN201496000U (en) * | 2009-08-20 | 2010-06-02 | 四川华工石油钢管有限责任公司 | Structure of hermetically sealed joint of oil pipe or sleeve |
| CN101806197A (en) * | 2010-03-26 | 2010-08-18 | 衡阳华菱连轧管有限公司 | Air-sealed saw-tooth threading connector and oil bushing and connecting hoop using same |
| CN201778676U (en) * | 2010-08-04 | 2011-03-30 | 宝山钢铁股份有限公司 | Low pressure-resistant air-tight seal sleeve joint |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106761462A (en) * | 2016-12-27 | 2017-05-31 | 中国石油天然气集团公司 | A kind of oil well casing special nipple |
| CN106761462B (en) * | 2016-12-27 | 2019-01-18 | 中国石油天然气集团公司 | A kind of oil well casing special nipple |
| CN111043413A (en) * | 2019-12-16 | 2020-04-21 | 中国石油天然气集团有限公司 | Threaded structure of threaded joint of PVC-lined steel pipe |
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| Publication number | Publication date |
|---|---|
| CN102926674B (en) | 2015-12-02 |
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