CN102678064B - Improve round thread oil pipe and the anti-stick control method of buckleing performance and bonding strength of sleeve pipe - Google Patents
Improve round thread oil pipe and the anti-stick control method of buckleing performance and bonding strength of sleeve pipe Download PDFInfo
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Abstract
The invention discloses and a kind ofly improve round thread oil pipe and the anti-stick control method of buckleing performance and bonding strength of sleeve pipe, belong to the technical field improving API round thread oil pipe and sleeve pipe object performance in oil and natural gas industry.Described method comprises yield strength, the control internal and external threads parameter of Comprehensive Control oil pipe, sleeve pipe and box cupling material and controls coupling surface Disposal quality, and described internal and external threads is specially coupling inner thread and sleeve external thread.The present invention passes through oil pipe, sleeve pipe and the Comprehensive Control such as box cupling material yield strength and internal and external threads parameter, both improve the anti-stick button performance of API round thread, its bonding strength have also been obtained large increase simultaneously, thus enhance sealing reliability in down-hole of API round thread oil pipe and casing joint and strength reliability, ensure that the safe handling of API round thread oil pipe and sleeve pipe.
Description
Technical field
The present invention relates to the technical field improving API round thread oil pipe and sleeve pipe object performance in oil and natural gas industry, particularly improve API round thread oil pipe and the anti-stick integrated control method buckleing performance and bonding strength of sleeve pipe simultaneously.
Background technology
Oil pipe and sleeve pipe are very important in oil and gas prospect, exploitation and the equipment that use amount is large, in exploitation total cost, on average account for about 25%.Oil pipe and sleeve pipe connect into tubing string by the screw thread with certain taper by root, form gas channel in lower going-into-well.API (American Petroleum Institute, American Petroleum Institute) round thread that specifies of standard is called for short API round thread, owing to there is simple, easy to maintenance, the good seal performance of processing and low-cost advantage, widely used by as oil pipe and casing joint screw thread.
For ensureing good interchangeability, API round thread dimensional parameters tolerance is larger.Because after button on API round thread, joint two ends contact is higher, easily there is thread gluing phenomenon in screw thread, and thread gluing easily causes flank to damage, thus cause nipple poorly sealed, and even bonding strength does not reach standard-required; Because API round thread dimensional parameters tolerance is larger, be in upper limit external screw thread within the scope of standard of tolerance and lower limit internal thread and carry out upper button when coordinating, joint two ends screw thread there will be thread gluing phenomenon, and the lower limit external screw thread be within the scope of standard of tolerance and upper limit internal thread carry out upper button when coordinating, then easily there is male connection from the phenomenon of female adapter slippage.If down-hole nipple occurs to leak or thread off, economic loss even serious accident will be caused, this makes the use of API round thread be restricted, being on the increase particularly in recent years along with deep-well and horizontal well, requires that API round thread oil pipe and sleeve pipe have good anti-stick performance of buckleing and have high bonding strength simultaneously.
Therefore, in actual applications, anti-stick performance and the bonding strength buckled needing to take measures to improve API round thread oil pipe and sleeve pipe is to meet the needs of practical application.Method conventional is at present according to actual needs, by carrying out qualitative adjustment to a certain parameter, as thread material etc., improves anti-stick button performance or the bonding strength of nipple.
Realizing in process of the present invention, inventor finds that prior art at least exists following problem: the anti-stick control method of buckleing performance and bonding strength of existing raising API round thread oil pipe and sleeve pipe, often occur during practical application focusing on improving the bonding strength that anti-stick button results of property reduces joint, or while the bonding strength improving joint, slackened the anti-stick button performance of joint.The patent No. be 99240437.1 Chinese utility model patent disclose a kind of method increasing screw thread top thread form angle to improve the anti-stick button performance of screw thread, but increasing form of thread angle can cause thread thinning, and the thread gaps after top screw-threaded engagement strengthens, and the anti-stick button performance of screw thread improves but the bonding strength of screw thread and sealing performance are greatly affected.
Summary of the invention
The object of the embodiment of the present invention is the defect for above-mentioned prior art, there is provided a kind of and improve round thread oil pipe and the anti-stick control method of buckleing performance and bonding strength of sleeve pipe, by to oil pipe, sleeve pipe and the Comprehensive Control such as box cupling material yield strength and internal and external threads parameter, both improve API round thread oil pipe and sleeve pipe is anti-stick buckles performance, the intensity that is simultaneously threaded is greatly improved.
The technical scheme that the present invention takes to achieve these goals is:
Improve round thread oil pipe and the anti-stick control method of buckleing performance and bonding strength of sleeve pipe, described control method comprises the yield strength and control internal and external screw thread parameter that control tubing and casing and box cupling material, wherein:
The yield strength of described control tubing and casing and box cupling material is specially: the minimum height 8-12% that the yield strength minimum controlling described tubing and casing material specifies than American Petroleum Institute's API Spec 5CT standard, controls the yield strength minimum height 1-3% of yield strength minimum than described tubing and casing material of described box cupling material;
Described internal and external screw thread is specially coupling inner thread and tubing and casing external screw thread, and described control internal and external screw thread parameter is specially:
Control the tapering of described internal and external screw thread: in described internal and external screw thread every meter length, diameter increment is 60-65mm/m,
Control the screw-pitch deviation of described internal and external screw thread: the described screw-pitch deviation in described internal and external screw thread per inch length is-0.05-+0.05mm,
Control the thread height deviation of described internal and external screw thread: the described thread height deviation of described internal and external screw thread is-0.025-+0.05mm.
Further, described control method also comprises the physical dimension controlling described sleeve pipe.
Further, described control method also comprises the described coupling inner thread surface treatment quality of control.
Further, described control method also comprises the black top screw thread controlling described tubing and casing.
Particularly, the physical dimension of described control tubing and casing is specially:
The outside diameter tolerance controlling described tubing and casing is the 0-+1% of the nominal diameter of described tubing and casing;
The wall thickness minimum value controlling described tubing and casing is more than or equal to 92.5% of the nominal wall thickness of described tubing and casing;
The external diameter ovality controlling described tubing and casing is less than or equal to 1%;
The eccentricity controlling described tubing and casing is less than or equal to 13%.
Particularly, the described coupling inner thread surface treatment quality of described control is specially:
Control described coupling inner thread alramenting layer smooth, even, fine and close, without obscission, described phosphate coating is connected closely with described coupling inner thread matrix, and the thickness controlling described phosphate coating is 0.018-0.028mm.
Particularly, the black top screw thread of the described tubing and casing of described control is specially: control described black top screw initial thread button circumferentially consistent, and starting buckle position, screw thread each orientation, described black top difference is within 2 buttons.The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is: by tubing and casing and the Comprehensive Control such as box cupling material yield strength and internal and external threads parameter, both improve the anti-stick button performance of API round thread tubing and casing, its bonding strength is also greatly improved simultaneously, thus enhance the sealing reliability of API round thread oil sleeve joint in down-hole and strength reliability, ensure that the safe handling of API round thread tubing and casing.Adopt the method to carry out quality examination and control to oil field round thread tubing and casing used, sleeve pipe accident declines obviously, and to reduce by 20 mouthfuls of well generation sleeve pipe quality problems every year, annual evitable direct economic loss just exceedes at least 3,000 ten thousand yuan.The popularization of the method will bring significant economic benefit and social benefit to oil field.
Accompanying drawing explanation
Fig. 1 is the joint schematic diagram after two oil/sleeve pipes providing in the embodiment of the present invention and a box cupling are threaded.
Wherein:
1, oil/sleeve pipe, 2, box cupling.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Embodiment 1
Embodiments provide the anti-stick integrated control method buckleing performance and bonding strength of a kind of raising API round thread oil/sleeve pipe simultaneously, see Fig. 1, described control method comprises the yield strength of control oil/sleeve pipe 1 and box cupling 2 material and controls internal and external screw thread parameter, and described internal and external screw thread is specially box cupling 2 internal thread and oil/sleeve pipe 1 external screw thread.The embodiment of the present invention is the control method for API round thread tubing and casing, and other parameters do not mentioned all control according to API standard-required.
Slippage is that internal and external screw thread connecting portion there occurs yield deformation in essence, is that material there occurs inefficacy after all, so the yield strength of material is one of most important factor affecting API Round threaded casing bonding strength.Increase the yield strength of oil/sleeve pipe and box cupling material, obviously can increase the ability of nipple resistance to deformation, thus increase the bonding strength of nipple.
The relation of thread parameter and thread gluing is comparatively large, and the too conference of fluctuating of the tapering of such as screw thread and pitch causes the Axial Interference of internal and external threads to increase, and then easily causes thread gluing.Therefore by controlling thread parameter, the generation of thread gluing phenomenon can effectively be prevented.
In sum, the embodiment of the present invention is by carrying out Comprehensive Control to oil/sleeve pipe and box cupling material yield strength and internal and external threads parameter, can improve that API round thread oil/sleeve pipe is anti-stick buckles performance, its bonding strength can be improved again, thus strengthen sealing reliability in down-hole of API knuckle screw joint and strength reliability, ensure the safe handling of API round thread oil/sleeve pipe.
Described control method also comprises the physical dimension of control oil/sleeve pipe 1.
Easily there is pull-out failure in API round thread oil/sleeve pipe, the intensity of slippage load and body male thread portion is closely related, thus the physical dimension controlling oil/sleeve pipe can improve the intensity of body male thread portion, thus effectively control API round thread oil/sleeve pipe pull-out failure phenomenon, further increase the bonding strength of API round thread oil/sleeve pipe.
Described control method also comprises control box cupling 2 interior threaded surface Disposal quality.
Thread-sticking causes because internal and external screw thread adhesive surface weares and teares, and double thread surface processes, and changes the intersolubility between friction pair, improves lubrication, thus improves the wear resistance of screw thread, further increase anti-stick button performance.
Described control method also comprises the black top screw thread of control oil/sleeve pipe 1.
Screw thread position can be made even 360 ° of stress distribution circumferentially by controlling black top screw thread, thus further increase the bonding strength of API round thread oil/sleeve pipe.
Embodiment 2
Buckle performance and bonding strength balancedly improves to ensure that API round thread oil/sleeve pipe is anti-stick, the present embodiment has carried out fixing quantity to each parameter on the basis of embodiment 1.
The yield strength controlling oil/sleeve pipe 1 and box cupling 2 material described in the embodiment of the present invention is specially:
The minimum height 8-12% that the yield strength minimum controlling oil/sleeve pipe 1 material specifies than API Spec 5CT standard, controls the yield strength minimum height 1-3% of yield strength minimum than oil/sleeve pipe 1 material of box cupling 2 material.
Control internal and external screw thread parameter described in the embodiment of the present invention to be specially:
Control the tapering of described internal and external screw thread: in described internal and external screw thread every meter length, diameter increment is 60-65mm/m;
Control the screw-pitch deviation of described internal and external screw thread: the described screw-pitch deviation in described internal and external screw thread per inch length is-0.05-+0.05mm;
In thread parameter, the relation of tapering and pitch and thread gluing is larger, the too conference of fluctuating of tapering and pitch causes the Axial Interference of internal and external threads to increase, and then easily cause thread gluing, be conducive to by the tapering and pitch that control screw thread the generation preventing thread gluing phenomenon, improve the anti-stick of API round thread oil/sleeve pipe and buckle performance.
Control the thread height deviation of described internal and external screw thread: the described thread height deviation of described internal and external screw thread is-0.025-+0.05mm.
Thread height is the key factor affecting the intensity that is threaded, by thread height Deviation Control within the scope of overgauge, add the area of screw thread bearing surface on the one hand, improve the frictional force of bearing surface, reduce the possibility of slippage, improve the bonding strength of screw thread, on the other hand, thread height increase makes the radial-deformation also corresponding increase needing during thread off to overcome, and the bonding strength of screw thread have also been obtained raising.
The physical dimension of described control oil/sleeve pipe 1 is specially:
Control the external diameter of oil/sleeve pipe 1: the nominal diameter of the outside diameter tolerance of oil/sleeve pipe 1 to be 0-+1%D, D be oil/sleeve pipe 1;
Control the wall thickness of oil/sleeve pipe 1: the wall thickness minimum value of oil/sleeve pipe 1 >=92.5%t, t is the nominal wall thickness of oil/sleeve pipe 1;
Easily there is pull-out failure in round thread oil/sleeve pipe, the intensity of slippage load and body male thread portion (especially thread engagement last detain near) is closely related, increase outer tube diameter and wall thickness also just increase the wall thickness of male thread portion, thus improve the bonding strength of round thread oil/sleeve pipe.
Control the external diameter ovality of oil/sleeve pipe 1: external diameter ovality≤1% of oil/sleeve pipe 1;
External diameter ovality is too large, and the internal and external threads after button can be caused to contact uneven, thus cause screw thread unbalance stress, reduce the supporting capacity of nipple, the external diameter ovality of conservative control oil/sleeve pipe can improve the supporting capacity of nipple.
Control the eccentricity of oil/sleeve pipe 1: eccentricity≤13% of oil/sleeve pipe 1.
Wherein: eccentricity
t
maxand t
minthe maximum value in the multiple wall thickness value on a certain cross section of measurement oil/sleeve pipe 1 and minimum value respectively.
Uniform wall thickness can make oil/sleeve pipe better centering in process, the screw thread of processing is more even, if eccentricity is larger, then the orientation wall thickness that has of thread bottom, same cross section is large, and some orientation wall thickness is little, and the minimum local stress of wall thickness is large, can preferentially lose efficacy, reduce the bonding strength of nipple, the present embodiment, by controlling eccentricity, effectively can improve the bonding strength of nipple.
Control box cupling 2 interior threaded surface Disposal quality described in the embodiment of the present invention to be specially:
Control when box cupling 2 interior threaded surface phosphate coating is estimated smooth, even, fine and close, without obscission, adopt phosphate coating described in metallographic observation to be connected closely with box cupling 2 internal thread matrix, the thickness controlling described phosphate coating is 0.018-0.028mm.
Thread-sticking causes because internal and external screw thread adhesive surface weares and teares, and double thread surface processes, and changes the intersolubility between friction pair, improves lubrication, thus improves the wear resistance of screw thread.When alramenting layer thickness is very thin, phosphate coating adhesive capacity is poor, also easily there is thread gluing in internal and external screw thread substrate contact under higher torsional interaction, increase phosphate coating thickness, the then Adhesion enhancement of phosphate coating on matrix, internal and external screw thread matrix not easily contacts, and anti-mistake is turned round ability and strengthened, and can significantly improve the anti-stick button performance of round thread.But the change of too thick phosphate coating thickness double thread parameter is larger, the mesh degree of screw thread can be affected, reduce the bonding strength of nipple, the embodiment of the present invention have chosen rational phosphate coating thickness on the basis of test of many times, not only achieves the object of the anti-stick button performance of nipple but also do not affect the bonding strength of nipple.
The black top screw thread controlling described oil/sleeve pipe described in the embodiment of the present invention is specially: control described black top screw initial thread and buckle circumferentially consistent, within starting buckle position, screw thread each orientation, described black top difference 2 button.
Ideally, black top external screw thread start occur position (button number) along the circumferential direction at most differ one button, but due to tube wall thickness ununiformity, external diameter circle, pipe eccentric or add man-hour not to medium reason easily cause black top screw thread start occur position have larger difference.
Black top external screw thread starting buckle is larger with the different differences in orientation, illustrate that external screw thread is circumferentially more uneven, and then screw thread position can be caused uneven 360 ° of stress distribution circumferentially, reduce the integrated connection intensity of nipple, thus the starting buckle position difference controlling each orientation of screw thread, black top, within 2 buttons, can strengthen the integrated connection intensity of nipple.
The API round thread oil/sleeve pipe of the control method manufacture provided by the embodiment of the present invention has good anti-stickly buckles performance, even if nipple to use in peak torque under thread parameter limit tolerance coordinates/and shackle also has no thread gluing 3 times, and the bonding strength of nipple exceeds more than 30% of API standard-required value in addition.The API round thread oil/sleeve pipe steady quality meeting this integrated control method is reliable, and anti-stick button function admirable, joint bonding strength is high, ensure that the economy that API round thread oil/sleeve pipe uses in down-hole and security reliability.
Embodiment 3
The control of API Φ 139.7 × 7.72mm N80 Round threaded casing 1 and box cupling 2 is undertaken by the following aspects:
(1) sleeve pipe 1 and box cupling 2 material yield strength is controlled:
Shell material yield strength minimum exceeds 10% control on the minimum basis that API Spec 5CT standard specifies, namely sleeve pipe 1 material yield strength controls within the scope of 607-758MPa; Box cupling 2 material yield strength minimum exceeds 12% control on the minimum basis that API Spec 5CT standard specifies, namely box cupling material yield strength controls within the scope of 618-758MPa.
(2) sleeve pipe 1 physical dimension is controlled:
1. external diameter: outside diameter tolerance controls within the scope of 0-+1%D, namely sleeve outer controls within the scope of φ 139.7-141.10mm.
2. wall thickness: wall thickness minimum value presses >=92.5%t control, i.e. wall thickness minimum value requirement >=7.14mm.
3. external diameter ovality: external diameter ovality controls≤1%.
4. eccentricity: eccentricity controls≤13%.
(3) internal and external screw thread state modulator:
1. tapering: in sleeve external thread and coupling inner thread every meter length, diameter increment controls within the scope of 60-65mm/m.
2. screw-pitch deviation: the screw-pitch deviation in internal and external screw thread per inch length controls in-0.05-+0.05mm scope.
3. thread height deviation: internal and external screw thread thread height Deviation Control is in-0.025-+0.05mm scope.
(4) box cupling 2 interior threaded surface Disposal quality controls:
Box cupling 2 interior threaded surface phosphate coating is smooth, even, fine and close, and without obscission, adopt metallographic observation phosphate coating to be connected with matrix closely, phosphate coating THICKNESS CONTROL is within the scope of 0.018-0.028mm.
(5) sleeve pipe 1 black top screw thread controls:
Sleeve pipe 1 black top screw initial thread button is circumferentially consistent, and the screw thread each orientation starting buckle position control of black top is in difference 2 is detained.
(6) other controls by API standard-required.
The sleeve pipe produce the control method that provides by the embodiment of the present invention and box cupling sample carry out actual loading test, to use in peak torque/shackle has no thread gluing 3 times, and the bonding strength of nipple reaches 2053kN, far away higher than other API knuckle screw joints.Meanwhile, the 1000 tons of specifications meeting the control method that the embodiment of the present invention provides are that the oval threaded sleeve 1 of Φ 139.7 × 7.72mm N80 and box cupling 2 use in the down-hole dark more than 3000m, reach re-set target, respond well.Adopt the method to carry out quality examination and control to oil field round thread tubing and casing used, sleeve pipe accident declines obviously, and to reduce by 20 mouthfuls of well generation sleeve pipe quality problems every year, annual evitable direct economic loss just exceedes at least 3,000 ten thousand yuan.The popularization of the method will bring significant economic benefit and social benefit to oil field.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. improve round thread oil pipe and the anti-stick control method of buckleing performance and bonding strength of sleeve pipe, it is characterized in that, described control method comprises the yield strength of control oil/sleeve pipe and box cupling material and controls internal and external screw thread parameter, wherein:
The yield strength of described control oil/sleeve pipe and box cupling material is specially: the minimum height 8-12% that the yield strength minimum controlling described oil/shell material specifies than American Petroleum Institute's API Spec 5CT standard, controls the yield strength minimum height 1-3% of yield strength minimum than described oil/shell material of described box cupling material;
Described internal and external screw thread is specially coupling inner thread and oil/sleeve external thread, and described control internal and external screw thread parameter is specially:
Control the tapering of described internal and external screw thread: in described internal and external screw thread every meter length, diameter increment is 60-65mm/m,
Control the screw-pitch deviation of described internal and external screw thread: the described screw-pitch deviation in described internal and external screw thread per inch length is-0.05-+0.05mm,
Control the thread height deviation of described internal and external screw thread: the described thread height deviation of described internal and external screw thread is-0.025-+0.05mm;
Described control method also comprises the black top screw thread controlling described oil/sleeve pipe, and the black top screw thread of the described oil/sleeve pipe of described control is specially: control described black top screw initial thread and buckle circumferentially consistent, starting buckle position, screw thread each orientation, described black top difference is within 2 buttons;
Described control method also comprises the described coupling inner thread surface treatment quality of control: control described coupling inner thread alramenting layer smooth, even, fine and close, without obscission, adopt phosphate coating described in metallographic observation to be connected closely with described coupling inner thread matrix, the thickness controlling described phosphate coating is 0.018-0.028mm;
Described control method also comprises the physical dimension controlling described oil/sleeve pipe.
2. raising round thread oil pipe according to claim 1 and the anti-stick control method of buckleing performance and bonding strength of sleeve pipe, is characterized in that, the physical dimension of the described oil/sleeve pipe of described control is specially:
The outside diameter tolerance controlling described oil/sleeve pipe is the 0-+1% of the nominal diameter of described oil/sleeve pipe;
The wall thickness minimum value controlling described oil/sleeve pipe is more than or equal to 92.5% of the nominal wall thickness of described oil/sleeve pipe;
The external diameter ovality controlling described oil/sleeve pipe is less than or equal to 1%;
The eccentricity controlling described oil/sleeve pipe is less than or equal to 13%.
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| CN201110353448.8A CN102678064B (en) | 2011-11-09 | 2011-11-09 | Improve round thread oil pipe and the anti-stick control method of buckleing performance and bonding strength of sleeve pipe |
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| CN201110353448.8A CN102678064B (en) | 2011-11-09 | 2011-11-09 | Improve round thread oil pipe and the anti-stick control method of buckleing performance and bonding strength of sleeve pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015187217A1 (en) | 2014-06-05 | 2015-12-10 | Materion Corporation | Coupling for rods |
| TWI636198B (en) * | 2016-12-29 | 2018-09-21 | 詮豐精密工具股份有限公司 | Threaded-engaging structure |
| CN111927373B (en) * | 2020-08-10 | 2022-07-05 | 中国石油天然气集团有限公司 | Threaded wellhead sealing detection pressure test load determination method, storage medium and equipment |
| CN114427626B (en) * | 2022-01-11 | 2024-06-18 | 江苏集萃碳纤维及复合材料应用技术研究院有限公司 | Connecting structure of composite material oil pipe |
| CN114635670B (en) * | 2022-02-25 | 2023-02-10 | 中国矿业大学 | Method for preventing fracture of geological casing for underground existing hydrographic drilling |
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| CA2477308A1 (en) * | 2002-03-01 | 2003-09-12 | Shell Canada Limited | Pipe system and method for its manufacture |
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