CN104483117A - Fatigue testing method and device for underwater flexible device - Google Patents
Fatigue testing method and device for underwater flexible device Download PDFInfo
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- CN104483117A CN104483117A CN201410748864.1A CN201410748864A CN104483117A CN 104483117 A CN104483117 A CN 104483117A CN 201410748864 A CN201410748864 A CN 201410748864A CN 104483117 A CN104483117 A CN 104483117A
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Abstract
The invention discloses a fatigue testing method for an underwater flexible device, comprising the following steps that (1) a bending moment is applied on a bending rotary shaft, and a flexible deflection unit is deflected around a deflection center O through the bending moment; (2) a locking block is used for limiting after the flexible deflection unit is deflected along with the bending rotary shaft; (3) internal pressure is applied to the underwater flexible device, and an axial force, which is outward along the direction of a deflection center line e, is applied to the flexible deflection unit by the internal pressure; (4) a variable frequency motor is started, and a turntable assembly drives the bending rotary shaft and the flexible deflection unit to perform a circular deflection motion; (5) test data are collected in real time, the test process is monitored in real time, the test is stopped till certain part of the flexible deflection unit is in fatigue fault, severe abrasion or sealing fault. The invention further discloses a fatigue testing device for the underwater flexible device. The fatigue testing method and the fatigue testing device for the underwater flexible device disclosed by the invention have the advantages of simplicity, easiness in operation, and accurate result.
Description
Technical field
The invention belongs to petroleum drilling technology field under ocean water, relate to a kind of fatigue test method of flexible device under water, the invention still further relates to a kind of fatigue experimental device of flexible device under water.
Background technology
Flexible device is one of important equipment in drilling riser guard system under water, and inside is provided with the sulfurations such as deflection axle, support ring, rubber and forms, and forms an overall flexible deflection unit.Flexible device is mainly arranged on the top with BOP group bottom marine riser under water, is used for allowing to there is angular deviation between drilling water-separation pipe and BOP group, thus reduces the bending moment on drilling water-separation pipe.
Flexible device is operated in deep water ocean under water, be subject to marine drilling platform (or ship) under the effect such as wave and ocean current, except producing upper and lower heave movement, also occur outside roll and pitch, these motions will affect riser system stability and well head set-up security.
Use safely under deep water marine environment in order to ensure flexible deflection unit, ensure that flexible device can not cause fatigue, wearing and tearing and seal failure etc. because of various operating load under extreme environment under water, be necessary for flexible device under water, especially Fatigue Life Assessment is carried out to flexible deflection unit, to detect fatigue lifetime, the anti-wear performance and sealing property etc. of flexible device and flexible deflection unit thereof.But also there is no at present that a kind of structure is simple, simple operation, economical and efficient the fatigue test method of flexible device under water.
Summary of the invention
The object of this invention is to provide a kind of fatigue test method of flexible device under water, solve in prior art and there is no the special problem for the effective fatigue test method of flexible device under water.
Another object of the present invention is to provide a kind of fatigue experimental device of flexible device under water.
The technical solution adopted in the present invention is, a kind of fatigue test method of flexible device under water, depends on a kind of test unit, implements according to following steps:
Step 1, on moment of flexure turning axle, apply bending moment M, the deflection that bending moment M makes the flexible deflection unit in flexible device under water occur around deflection center O, deflection angle α determines arbitrarily; The size of bending moment M is determined by deflection stiffness k and deflection angle α,
Bending moment M computing formula is: M=k α,
Wherein, M-moment of flexure moment, unit is Nm;
K-deflection stiffness, unit is Nm/deg;
α-deflection angle, unit is deg;
Step 2, flexible deflection unit carry out spacing with lock dog after deflecting with moment of flexure turning axle, keep the deflection angle of flexible deflection unit and moment of flexure turning axle;
Interior pressure P is squeezed in step 3, the lower flexible device that feeds water, interior pressure P produces the axial force F outside along deflection center line e direction to flexible deflection unit, axial force F equals interior pressure P and is multiplied by packing surface, and packing surface is the packing surface of flexible device upper end metal sealing cushion ring under water;
Step 4, startup variable-frequency motor drive rotating disk assembly to rotate centered by rotation centerline Z by reducer casing, and rotating disk assembly band dynamical bending moment turning axle and flexible deflection unit carry out circumferential deflection motion;
Step 5, Real-time Collection test figure and monitoring test process, until certain parts generation fatigue failure, serious wear or seal failure phenomenon in flexible deflection unit, then stop test, and add up circumferential deflection number of times.
Another technical scheme of the present invention is, a fatigue experimental device for flexible device under water, comprises Bending Rotation axle, and the upper end of Bending Rotation axle is T connector, this T connector is sleeved in the T-slot of rotating disk assembly, and the T connector both sides of this T-slot are respectively arranged with limited block and lock dog; The lower end of Bending Rotation axle is Step Shaft, is sleeved in bearing seat assembly;
Rotating disk assembly upwards hangs with test-bed and is connected, and the transmission shaft of rotating disk assembly is in transmission connection by reducer casing and variable-frequency motor; Meanwhile, the transmission shaft of rotating disk assembly is positioned on same axial line with the rotation centerline Z of flexible device under water; The T-slot of rotating disk assembly is arc-shaped.
The invention has the beneficial effects as follows, for a kind of method of carrying out torture test under deflection or case of bending of flexible device design under water, for the underwater flexible device of long-term work provides a kind of torture test means and life detecting method, to evaluate its fatigue lifetime, anti-wear performance and sealing property etc., solving in prior art can not be that flexible device carries out the problem of torture test under water, specifically comprises:
1) simple, the simple operation of the principle of the invention, economical and efficient, can produce bending moment, also can squeeze into interior pressure simultaneously, and implement circumferential deflection motion to flexible deflection unit.
2) bending moment can make flexible deflection unit generation any direction and deflect at any angle, the lower deflection or bending produced of the simulation drilling riser guard system effect of carrying outside.
3) in, pressure produces the axial thrust along yawing moment to flexible deflection unit on the one hand, the pulling force that analog platform or ocean current etc. produce; On the other hand for detecting leakage when tired, wearing and tearing and seal failure occur each parts in flexible device under water.
4) flexible deflection unit carries out circumferential deflection motion under certain angle and interior pressure operating mode, is to flexible device integration test under water and inspection.It can realize comprehensive, move without the circumferential deflection at dead angle, accomplish the serviceable life of the lower flexible device of test water to greatest extent, anti-wear performance and sealing property.
Accompanying drawing explanation
Fig. 1 is the structural representation of the test unit that the inventive method relies on;
Fig. 2 is the A-A cross-sectional view in Fig. 1.
In figure, 1. lower flange, 2. upper flange, 3. flexible device, 4. bearing seat assembly, 5. Bending Rotation axle, 6. limited block, 7. rotating disk assembly, 8. lock dog, 9. test-bed, 10. variable-frequency motor under water, 11. reducer casinges,
4-1. bearing seat, 4-2. bearing inner sleeve, 4-3. bearing outside, 4-4. bearing (ball) cover, 4-5. bearing, 4-6. pressing plate,
In addition, O is deflection center, and Z is rotation centerline, and e is deflection center line, and M is bending moment, and P is interior pressure, and α is deflection angle, and ω is circumferential deflection motion.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
See figures.1.and.2, the test unit structure that the inventive method relies on is, comprise the Bending Rotation axle 5 that can apply moment of flexure moment and circumferential deflection motion, the upper end of Bending Rotation axle 5 is T connector, this T connector is sleeved in the T-slot of rotating disk assembly 7, and the T connector both sides of this T-slot are respectively arranged with limited block 6 and lock dog 8; The lower end of Bending Rotation axle 5 is Step Shaft, is sleeved in bearing seat assembly 4;
Rotating disk assembly 7 upwards hangs with test-bed 9 and is connected, and the transmission shaft of rotating disk assembly 7 is in transmission connection by reducer casing 11 and variable-frequency motor 10; Meanwhile, the transmission shaft of rotating disk assembly 7 is positioned on same axial line with the rotation centerline Z of flexible device 3 under water, and rotating disk assembly 7 provides the rotary motion of the circumference centered by rotation centerline Z for system; Rotating disk assembly 7 is provided with T-slot, and T-slot is arc-shaped, and circular arc for the center of circle, meets the swing of Bending Rotation axle 5 under any deflection angle with deflection center O; And T-slot has enough spaces, in meeting, pressure P promotes the axial displacement along deflection center line e direction such as flexible deflection unit and Bending Rotation axle 5; Arrange limited block 6 and lock dog 8 in the T-slot of rotating disk assembly 7, limited block 6 departs from T-slot for preventing Bending Rotation axle 5; Lock dog 8 is for keeping the deflection of Bending Rotation axle 5 under arbitrarily angled;
Bearing seat assembly 4 is connected with upper flange 2 fixing (passing through screw); Upper flange 2 is fixed (by bolt and nut) with the flexible deflection unit upper flange of flexible device 3 under water again and is connected; The flange in the bottom of flexible device 3 is connected with lower flange 1 fixing (by bolt and nut) under water, and lower flange 1 is fixedly mounted on test platform.
With reference to Fig. 2, bearing seat assembly 4 comprises bearing seat 4-1, and in bearing seat 4-1 inner chamber, upper-lower position is respectively arranged with a bearing 4-5, is supported between two bearing 4-5 by bearing inner sleeve 4-2 and bearing outside 4-3 interval; Bearing seat 4-1 upper surface (adopting bolt and nut) is provided with bearing (ball) cover 4-4, and bearing (ball) cover 4-4 is for compressing the bearing 4-5 of upper end; The lower end of Bending Rotation axle 5 is sleeved in two bearing 4-5, and Bending Rotation axle 5 lower surface (passing through screw) is provided with pressing plate 4-6, and pressing plate 4-6 is for compressing the bearing 4-5 of lower end.As seen from Figure 2, bearing seat assembly 4 both can transmit bending moment M, to possess again between Bending Rotation axle 5 function in relative rotation.
The fatigue test method of flexible device under water of the present invention, utilizes above-mentioned test unit, implements according to following steps:
Step 1, on moment of flexure turning axle 5, apply bending moment M, bending moment M is applied by oil cylinder or alternate manner, the deflection that bending moment M makes the flexible deflection unit in flexible device 3 under water occur around deflection center O, and deflection angle α determines arbitrarily; The size of bending moment M is determined by deflection stiffness k and deflection angle α, and deflection angle α is larger, and bending moment M is larger,
The bending moment M computing formula put on moment of flexure turning axle 5 is: M=k α,
Wherein, M-moment of flexure moment, unit is Nm;
K-deflection stiffness, unit is Nm/deg;
α-deflection angle, unit is deg;
After step 2, flexible deflection unit deflect with moment of flexure turning axle 5, carry out spacing with lock dog 8, keep the deflection angle of flexible deflection unit and moment of flexure turning axle 5;
Interior pressure P is squeezed in step 3, the lower flexible device 3 that feeds water, interior pressure P produces the axial force F outside along deflection center line e direction to flexible deflection unit, axial force F equals interior pressure P and is multiplied by packing surface, and packing surface is the packing surface of flexible device upper end metal sealing cushion ring under water;
Step 4, startup variable-frequency motor 10 drive rotating disk assembly 7 to rotate centered by rotation centerline Z by reducer casing 11, and rotating disk assembly 7 is with dynamical bending moment turning axle 5 and flexible deflection unit to carry out circumferential deflection motion;
Step 5, Real-time Collection test figure and monitoring test process, until certain parts generation fatigue failure, serious wear or seal failure phenomenon in flexible deflection unit, then stop test, and add up circumferential deflection number of times.
The fatigue test method principle of work of flexible device under water of the present invention is, Bending Rotation axle 5 is under the effect of bending moment M, with deflection center O for the center of circle deflects, simultaneously by the transmission of bearing seat assembly 4 and upper flange 2 etc., the flexible deflection unit in flexible device 3 is under water made to realize synchronous deflection; After deflection angle α arrives predetermined angle, utilize the lock dog 8 in rotating disk assembly 7 in T-slot to be undertaken spacing by Bending Rotation axle 5, and keep this deflection angle α; In flexible device 3 under water, squeeze into interior pressure P, interior pressure P again axial force F along deflection center line e direction is produced to flexible deflection unit; Finally, starting variable-frequency motor 10 drives rotating disk assembly 7 to rotate centered by rotation centerline Z by reducer casing 11, and be with dynamical bending moment turning axle 5 and flexible deflection unit to carry out circumferential deflection motion ω, record related data, until there is destructive phenomenon, realizes the torture test of flexible device under water.
Fatigue test method of the present invention, for flexible device integration test under water and inspection, can realize comprehensive, move without the circumferential deflection at dead angle, accomplish the serviceable life of the lower flexible device of test water to greatest extent, anti-wear performance and sealing property.
Claims (5)
1. a fatigue test method for flexible device under water, its feature is, depends on a kind of test unit, implements according to following steps:
Step 1, in the upper deflection applying bending moment M, bending moment M and make the flexible deflection unit in flexible device (3) under water occur around deflection center O of moment of flexure turning axle (5), deflection angle α determines arbitrarily; The size of bending moment M is determined by deflection stiffness k and deflection angle α,
Bending moment M computing formula is: M=k α,
Wherein, M-moment of flexure moment, unit is Nm;
K-deflection stiffness, unit is Nm/deg;
α-deflection angle, unit is deg;
Step 2, flexible deflection unit carry out spacing with lock dog (8) after deflecting with moment of flexure turning axle (5), keep the deflection angle of flexible deflection unit and moment of flexure turning axle (5);
Interior pressure P is squeezed in step 3, the lower flexible device (3) that feeds water, interior pressure P produces the axial force F outside along deflection center line e direction to flexible deflection unit, axial force F equals interior pressure P and is multiplied by packing surface, and packing surface is the packing surface of flexible device upper end metal sealing cushion ring under water;
Step 4, startup variable-frequency motor (10) drive rotating disk assembly (7) to rotate centered by rotation centerline Z by reducer casing (11), and rotating disk assembly (7) band dynamical bending moment turning axle (5) and flexible deflection unit carry out circumferential deflection motion;
Step 5, Real-time Collection test figure and monitoring test process, until certain parts generation fatigue failure, serious wear or seal failure phenomenon in flexible deflection unit, then stop test, and add up circumferential deflection number of times.
2. the fatigue test method of flexible device under water according to claim 1, its feature is: described test unit structure is, comprise Bending Rotation axle (5), the upper end of Bending Rotation axle (5) is T connector, this T connector is sleeved in the T-slot of rotating disk assembly (7), and the T connector both sides of this T-slot are respectively arranged with limited block (6) and lock dog (8); The lower end of Bending Rotation axle (5) is Step Shaft, is sleeved in bearing seat assembly (4);
Rotating disk assembly (7) upwards hangs with test-bed (9) and is connected, and the transmission shaft of rotating disk assembly (7) is in transmission connection by reducer casing (11) and variable-frequency motor (10); Meanwhile, the transmission shaft of rotating disk assembly (7) is positioned on same axial line with the rotation centerline Z of flexible device (3) under water; The T-slot of rotating disk assembly (7) is arc-shaped.
3. the fatigue test method of flexible device under water according to claim 2, its feature is: described bearing seat assembly (4) is fixedly connected with upper flange (2); Upper flange (2) is fixedly connected with the flexible deflection unit upper flange of flexible device 3 under water again; The flange in the bottom of flexible device (3) is fixedly connected with lower flange (1) under water, and lower flange (1) is fixedly mounted on test platform.
4. the fatigue experimental device of a flexible device under water, its feature is: comprise Bending Rotation axle (5), the upper end of Bending Rotation axle (5) is T connector, this T connector is sleeved in the T-slot of rotating disk assembly (7), and the T connector both sides of this T-slot are respectively arranged with limited block (6) and lock dog (8); The lower end of Bending Rotation axle (5) is Step Shaft, is sleeved in bearing seat assembly (4);
Rotating disk assembly (7) upwards hangs with test-bed (9) and is connected, and the transmission shaft of rotating disk assembly (7) is in transmission connection by reducer casing (11) and variable-frequency motor (10); Meanwhile, the transmission shaft of rotating disk assembly (7) is positioned on same axial line with the rotation centerline Z of flexible device (3) under water; The T-slot of rotating disk assembly (7) is arc-shaped.
5. the fatigue experimental device of flexible device under water according to claim 4, its feature is: described bearing seat assembly (4) is fixedly connected with upper flange (2); Upper flange (2) is fixedly connected with the flexible deflection unit upper flange of flexible device 3 under water again; The flange in the bottom of flexible device (3) is fixedly connected with lower flange (1) under water, and lower flange (1) is fixedly mounted on test platform.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410748864.1A CN104483117B (en) | 2014-12-04 | 2014-12-04 | Fatigue testing method and device for underwater flexible device |
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| CN201410748864.1A CN104483117B (en) | 2014-12-04 | 2014-12-04 | Fatigue testing method and device for underwater flexible device |
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| CN104483117B CN104483117B (en) | 2017-01-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167390A (en) * | 2017-05-22 | 2017-09-15 | 中国海洋石油总公司 | A kind of deepwater subsea well mouthful fatigue experimental device |
| CN113607557A (en) * | 2021-08-04 | 2021-11-05 | 江苏宏泰石化机械有限公司 | Ultrahigh-pressure non-standard flange experimental device and experimental method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05288650A (en) * | 1992-04-13 | 1993-11-02 | Furukawa Electric Co Ltd:The | Pipe-deterioration detecting method |
| CN101377121A (en) * | 2008-10-08 | 2009-03-04 | 宝鸡石油机械有限责任公司 | Underwater flexible apparatus for sea well drilling |
| WO2009109745A1 (en) * | 2008-03-05 | 2009-09-11 | Schlumberger Holdings Limited | Flexible pipe fatigue monitoring below the bend stiffener of a flexible riser |
| US8451441B2 (en) * | 2008-10-24 | 2013-05-28 | Technip France | Method for calibrating a device for optical curvature monitoring |
| CN103334703A (en) * | 2013-06-24 | 2013-10-02 | 宝鸡石油机械有限责任公司 | Middle dual-flexibility device for offshore drilling riser |
-
2014
- 2014-12-04 CN CN201410748864.1A patent/CN104483117B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05288650A (en) * | 1992-04-13 | 1993-11-02 | Furukawa Electric Co Ltd:The | Pipe-deterioration detecting method |
| WO2009109745A1 (en) * | 2008-03-05 | 2009-09-11 | Schlumberger Holdings Limited | Flexible pipe fatigue monitoring below the bend stiffener of a flexible riser |
| CN101377121A (en) * | 2008-10-08 | 2009-03-04 | 宝鸡石油机械有限责任公司 | Underwater flexible apparatus for sea well drilling |
| US8451441B2 (en) * | 2008-10-24 | 2013-05-28 | Technip France | Method for calibrating a device for optical curvature monitoring |
| CN103334703A (en) * | 2013-06-24 | 2013-10-02 | 宝鸡石油机械有限责任公司 | Middle dual-flexibility device for offshore drilling riser |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167390A (en) * | 2017-05-22 | 2017-09-15 | 中国海洋石油总公司 | A kind of deepwater subsea well mouthful fatigue experimental device |
| CN107167390B (en) * | 2017-05-22 | 2024-02-20 | 中国海洋石油集团有限公司 | Deep water underwater wellhead fatigue test device |
| CN113607557A (en) * | 2021-08-04 | 2021-11-05 | 江苏宏泰石化机械有限公司 | Ultrahigh-pressure non-standard flange experimental device and experimental method |
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| CN104483117B (en) | 2017-01-25 |
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Effective date of registration: 20210104 Address after: 721002 No.2 Dongfeng Road, Jintai District, Baoji City, Shaanxi Province Patentee after: Baoji Oilfield Machinery Co.,Ltd. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC national oil and gas drilling equipment Engineering Technology Research Center Co., Ltd Address before: 721002 No. 2 Dongfeng Road, Shaanxi, Baoji Patentee before: Baoji Oilfield Machinery Co.,Ltd. |
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