CN102279071B - Test device for jacking tension and effective tension of deepwater jacking tension type upright tube - Google Patents
Test device for jacking tension and effective tension of deepwater jacking tension type upright tube Download PDFInfo
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- CN102279071B CN102279071B CN 201110161179 CN201110161179A CN102279071B CN 102279071 B CN102279071 B CN 102279071B CN 201110161179 CN201110161179 CN 201110161179 CN 201110161179 A CN201110161179 A CN 201110161179A CN 102279071 B CN102279071 B CN 102279071B
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- tension
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- top tension
- vertical pipe
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Abstract
The invention relates to a research test device for an ocean deepwater upright tube, in particular to a test device for jacking tension and effective tension of a deepwater jacking tension type upright tube. The test device comprises a bracket arranged on a base and a counter-force frame arranged at the upper end of the bracket, wherein the counter-force frame is connected to a chuck at the upper end of a model pipeline through a spring; an external pressure water drum is arranged outside the model pipeline; an internal water tank is connected to the bottom of the model pipeline; and a plurality of strain gauges are arranged on the model pipeline. The test device can be used for finishing the experimental research on the jacking tension and the effective tension of the deepwater jacking tension type upright tube and providing basis and test proof for calculating the jacking tension and the effective tension of the deepwater jacking tension type upright tube.
Description
Technical field
The present invention relates to the development test device of ocean deepwater standpipe, be specifically related to a kind of top tension force and effective tension test unit of deep water top tension type vertical pipe.
Background technology
Deep water top tension type vertical pipe is a kind of main Types of deep water marine riser, and the lower end of standpipe is connected with subsea wellheads, and wall tension acts directly on well head, and the fluid in pipe passes standpipe from the seabed continuously and flows to floating platform.The top tensiometer of deep water top tension type vertical pipe is the basis of design and analysis, if top Tension design value is on the low side, might cause buckling of standpipe, and the Tension design value higher standpipe that may cause in top ruptures.And top tension force also is directly connected to the calculating of standpipe natural frequency, if it is inaccurate that top tension force calculates, the natural frequency of design may produce larger deviation with the natural frequency of standpipe reality, when serious, may cause the natural frequency of standpipe and the excellent frequency of marine environment load approach and cause and resonate.Therefore, the top tension force that calculates exactly standpipe all has great significance for design analysis and the research of standpipe.
At present, the top tension force of standpipe is to adopt the design top coefficient of tension to multiply by standpipe and the weight of tube fluid in seawater, thinks that namely the fluid weight in standpipe has contribution to wall tension.Specific formula for calculation is as follows:
T
top＝f
T·(W
riser+W
fluid-W
displacedwater) (1)
In formula: T
topTop tension force for standpipe;
f
TBe the top coefficient of tension;
W
RiserWeight for standpipe;
W
FluidWeight for the standpipe inner fluid;
W
DisplacedwaterArrange the weight of water for standpipe.
And in fact, the bottom of standpipe is connected on subsea wellheads, during normal production, fluid in pipe passes from oil well the floating platform that standpipe flows to the water surface, no matter what kind of axial deformation occurs in standpipe under the effect of top tension force, as long as the xsect of standpipe is warpage not, flowing of fluid can not be affected.Therefore, the fluid that flows in standpipe is on the not impact of top tension force.Unless the valve closing of subsea wellheads, the fluid weight that is locked in standpipe may have contribution to the top tension force of standpipe, and but, this is not confirmed yet.
The effective tension of deep water top tension type vertical pipe is another important parameter of standpipe design and analysis, and it directly has influence on the geometric stiffness of standpipe and calculates, thereby affects kinematic behavior and the RESPONSE CALCULATION of standpipe, until affect the fatigue design analysis of standpipe.If the effective tension calculated value is inaccurate, the geometric stiffness of the geometric stiffness calculated value of standpipe and standpipe reality produces deviation, may cause the natural frequency of standpipe and the excellent frequency of marine environment load approach and cause and resonate.
At present, the effective tension of deep water top tension type vertical pipe is based on law of buoyancy and the balance condition analysis obtains, and can be expressed as:
T
e＝T
w-p
iA
i+p
0A
0 (2)
In formula: T
wBe the standpipe wall tension;
p
i, p
0Be respectively the pressure of the inside and outside fluid of standpipe, wherein p
iDo not comprise hydrostatic head pressure;
A
i, A
0Be respectively the inside and outside wall cross-sectional area of standpipe.
Suppose that wherein infinitesimal section (the comprising internal flow) two ends of standpipe directly are subject to the effect of seawater, this and actual conditions have larger difference.The lower end of standpipe is connected with subsea wellheads, and the upper end is higher than the sea level, and therefore, any one infinitesimal section two ends of standpipe are not subjected to the direct effect of seawater, and in above-mentioned effective tension computing formula, relevant with external pressure is irrational.
Summary of the invention
The object of the invention is to the defective for existing deep water top tension type vertical pipe research, a kind of top tension force and effective tension test unit of deep water top tension type vertical pipe is provided, provide foundation and verification experimental verification for the top tension force of the pre-tension-type vertical pipe of deep water and effective tension calculate.
technical scheme of the present invention is as follows: a kind of top tension force of deep water top tension type vertical pipe and effective tension test unit, comprise the support that is arranged on base, and the reaction frame that is arranged on the support upper end, reaction frame is connected with the chuck of model pipeline upper end by spring, described model pipeline peripheral hardware has the external pressure water drum, setting-out case in model pipeline bottom connects, be provided with several strainometers on the model pipeline, the top of described model pipeline is connected with water storage box by recirculatory pipe, be provided with water pump between water storage box and interior setting-out case, the pump entrance pipe connects water storage box, setting-out case in pump outlet tube connects.
Further, the top tension force of deep water top tension type vertical pipe as above and effective tension test unit, wherein, described chuck is connected with chute by the chuck support, and chute is arranged on the slideway of support.
Further, the top tension force of deep water top tension type vertical pipe as above and effective tension test unit, wherein, the spring between described reaction frame and chuck is provided with the spring tension meter for the top tension force that changes the model pipeline.
Further, the top tension force of deep water top tension type vertical pipe as above and effective tension test unit, wherein, the lower end of described model pipeline is communicated with interior setting-out case by inlet valve and short tube, and short tube is fixedly connected with interior setting-out case.
Further, the top tension force of deep water top tension type vertical pipe as above and effective tension test unit, wherein, described external pressure water drum is fixedly connected with support with the clip bearing by clip.
Further, the top tension force of deep water top tension type vertical pipe as above and effective tension test unit, wherein, described model pipeline passes the cylinder bottom employing glass cement sealing of external pressure water drum.
Further, the top tension force of deep water top tension type vertical pipe as above and effective tension test unit, wherein, the upper end of described model pipeline is provided with tensimeter.
Further, the top tension force of deep water top tension type vertical pipe as above and effective tension test unit, wherein, described strainometer sticks on respectively the position, three of upper, middle and lower of model pipeline.
Beneficial effect of the present invention is as follows: the present invention can change the top tension force of model pipeline by tensioning or lax spring tension meter, simulate being connected of standpipe and subsea wellheads by short tube and interior setting-out case are fixed, can select a plurality of pressure between zero interior pressure and maximum internal pressure to carry out respectively the effective tension test of the effective tension test of top tension test, interior pressure effect, interior external pressure effect and the effective tension test of external pressure effect, verify more fully the correctness of the effective tension computing formula of deep water top tension type vertical pipe.The present invention can complete top tension force and the effective tension experimental study of deep water top tension type vertical pipe, provides foundation and verification experimental verification for the top tension force of deep water top tension type vertical pipe and effective tension calculate.
Description of drawings
Fig. 1 is test unit structural representation of the present invention.
Embodiment
Describe the present invention below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the top tension force of deep water top tension type vertical pipe and effective tension test unit comprise the support 12 that is arranged on base 11, and base 11 is welded to connect with support 12, and support 12 upper ends are provided with reaction frame 13, and reaction frame 13 is welded to connect with support 12.Model pipeline 1 upper end is provided with chuck 14, and reaction frame 13 is connected with chuck 14 by spring.Chuck 14 is welded to connect with chuck support 15, and stiffening plate 16 is welded to connect with chuck support 15, and chute 17 is welded to connect with chuck support 15 and stiffening plate 16, and slideway 18 is welded to connect with support 12, and chute 17 can be free to slide on slideway 18.Be provided with spring tension meter 21 on the spring between reaction frame 13 and chuck 14, by tensioning or lax spring tension meter 21, can change the top tension force of model pipeline 1.Model pipeline 1 is outer is provided with external pressure water drum 2, and external pressure water drum 2 is provided with clip 19, and clip 19 is weldingly fixed on support 12 after being welded to connect with clip support 20, and external pressure water drum 2 is fixed on support 12 by clip 19.Strainometer 22,23 and 24 sticks on the cross section, three of upper, middle and lower of model pipeline 1, and model pipeline 1 passes the cylinder bottom employing glass cement sealing of external pressure water drum 2, makes it have certain elasticity, does not affect stretcher strain.Tensimeter 25 is equipped with in the upper end of model pipeline 1, and the lower end is communicated with interior setting-out case 3 by inlet valve 4 and short tube 26, and short tube 26 and interior setting-out case 3 are fixed, to simulate being connected of standpipe and subsea wellheads.The top of model pipeline 1 is connected with water storage box 7 by recirculatory pipe 6, and recirculatory pipe 6 is provided with outlet valve 5, is provided with water pump 8 between water storage box 7 and interior setting-out case 3, and the inlet tube 10 of water pump 8 connects water storage box 7, setting-out case 3 in the outlet 9 of water pump 8 connects.
Utilize the concrete test method of device of the present invention as follows:
To the interior water-filling of water storage box 7, open simultaneously inlet valve 4 and outlet valve 5, start water pump 8, make the water that is filled with water to recirculatory pipe 6 in system flow into water storage box 7, stop water-filling during a little less than the lower port of recirculatory pipe 6 until the water level of water storage box 7.
Water proper flow in keeping system, making tensimeter 25 and strainometer 22,23,24 reading is zero.Then the tensioning spring tautness meter 21, make strainometer 22,23 and 24 minimum strain value reach 200～1000 microstrains, record spring tension meter 21 and strainometer 22,23,24 reading.
One, top tension test
Switch off the pump 8, close simultaneously outlet valve 5 and inlet valve 4, whether the reading of observing tensimeter 25 changes, if pressure is non-vanishing, Open valve 5 relief pressures slightly make pressure gauge reading be down to zero and valve-off 5 rapidly, equate when keeping the water yield in model pipe with proper flow, observe spring tension meter 21 and strainometer 22,23, whether 24 reading changes, and records spring tension meter 21 and strainometer 22,23,24 reading.
Spring tension meter 21 and strainometer 22,23,24 test data are analyzed water proper flow and top tension force and the wall tension of mobile two states condition drag pipeline 1 in comparison system.If the mode of test of many times result shows the top tension force of two states and wall tension and equates, verified the weight of tube fluid to the not impact of top tension force, therefore, top tension force should not calculate the weight of tube fluid when calculating.If top tension force and the wall tension of two states are unequal, top tension force and the wall tension difference of reply two states are analyzed, if the top tension force that this difference and tube fluid weight cause and the increment of wall tension coincide, should calculate the weight of tube fluid when top tension force calculates, otherwise, this difference should be considered as test error.
Two, the effective tension of interior pressure effect test
Open inlet valve 4 and water pump 8, the tube fluid pressure of model pipeline 1 is raise.In order to improve the signal to noise ratio (S/N ratio) of test, tube fluid pressure should reach the nominal pressure of model pipeline 1.After pressure rises to predetermined pressure, close inlet valve 4, the holding tube internal pressure is constant, records spring tension meter 21, tensimeter 25 and strainometer 22,23,24 reading.
With tensimeter 25 and strainometer 22,23,24 test data substitution effective tension computing formula (formula in background technology (2)), calculate the effective tension in strainometer 22,23 and 24 cross sections, place, then according to the longitudinal balance condition of model pipeline 1, analyze the equilibrium problem of effective tension and the top tension force that spring tension meter 21 represents in strainometer 22,23 and 24 cross sections, place, if the effective tension in each cross section and top tension force satisfy equilibrium condition, satisfy effective tension computing formula (2) without the external pressure condition.Otherwise the formula of effective tension (2) is incorrect.
Three, the effective tension of interior external pressure effect test
Keep the trystate of above-mentioned effective tension test constant, external pressure water drum 2 is full of water, record spring tension meter 21, tensimeter 25 and strainometer 22,23,24 reading.
In repeating, identical calculating in the test of the effective tension of pressure effect, obtain the effective tension result of calculation under interior outside casing spare, and determine the correctness of effective tensiometer calculation formula (2) according to equilibrium condition.
Four, the effective tension of external pressure effect test
Open outlet valve 5, make the tube fluid Pressure Drop of model pipeline 1 to zero, close rapidly outlet valve 5.Then, record spring tension meter 21 and strainometer 22,23,24 reading.
In repeating, identical calculating in the test of the effective tension of pressure effect, obtain only having the effective tension result of calculation under the external pressure condition, and determine the correctness of effective tensiometer calculation formula (2) according to equilibrium condition.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if of the present invention these are revised and within modification belongs to the scope of claim of the present invention and equivalent technology thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (8)
1. the top tension force of a deep water top tension type vertical pipe and effective tension test unit, it is characterized in that: comprise the support (12) that is arranged on base (11), and the reaction frame (13) that is arranged on support (12) upper end, reaction frame (13) is connected with the chuck (14) of model pipeline (1) upper end by spring, the outer external pressure water drum (2) that is provided with of described model pipeline (1), setting-out case (3) in model pipeline (1) bottom connects, be provided with several strainometers (22 on model pipeline (1), 23, 24), the top of described model pipeline (1) is connected with water storage box (7) by recirculatory pipe (6), be provided with water pump (8) between water storage box (7) and interior setting-out case (3), pump entrance pipe (10) connects water storage box (7), setting-out case (3) in pump outlet tube (9) connects.
2. the top tension force of deep water top tension type vertical pipe as claimed in claim 1 and effective tension test unit, it is characterized in that: described chuck (14) is connected with chute (17) by chuck support (15), and chute (17) is arranged on the slideway (18) of support.
3. the top tension force of deep water top tension type vertical pipe as claimed in claim 1 or 2 and effective tension test unit is characterized in that: the spring between described reaction frame (13) and chuck (14) is provided with the spring tension meter (21) for the top tension force that changes model pipeline (1).
4. the top tension force of deep water top tension type vertical pipe as claimed in claim 1 and effective tension test unit, it is characterized in that: the lower end of described model pipeline (1) is communicated with interior setting-out case (3) by inlet valve (4) and short tube (26), and short tube (26) is fixedly connected with interior setting-out case (3).
5. the top tension force of deep water top tension type vertical pipe as claimed in claim 1 and effective tension test unit, it is characterized in that: described external pressure water drum (2) is fixedly connected with support (12) with clip bearing (20) by clip (19).
6. the top tension force of deep water top tension type vertical pipe as claimed in claim 1 and effective tension test unit is characterized in that: described model pipeline (1) passes the cylinder bottom of external pressure water drum (2) and adopts glass cement sealing.
7. the top tension force of deep water top tension type vertical pipe as claimed in claim 1 and effective tension test unit, it is characterized in that: the upper end of described model pipeline (1) is provided with tensimeter (25).
8. the top tension force of deep water top tension type vertical pipe as claimed in claim 1 and effective tension test unit, it is characterized in that: described strainometer (22,23,24) sticks on respectively the position, three of upper, middle and lower of model pipeline (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110161179 CN102279071B (en) | 2011-06-16 | 2011-06-16 | Test device for jacking tension and effective tension of deepwater jacking tension type upright tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110161179 CN102279071B (en) | 2011-06-16 | 2011-06-16 | Test device for jacking tension and effective tension of deepwater jacking tension type upright tube |
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| Publication Number | Publication Date |
|---|---|
| CN102279071A CN102279071A (en) | 2011-12-14 |
| CN102279071B true CN102279071B (en) | 2013-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110161179 Expired - Fee Related CN102279071B (en) | 2011-06-16 | 2011-06-16 | Test device for jacking tension and effective tension of deepwater jacking tension type upright tube |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478508B (en) * | 2017-07-04 | 2020-05-19 | 浙江海洋大学 | Complex bending test device for deep water top tension type vertical pipe |
| US10641668B2 (en) * | 2018-01-23 | 2020-05-05 | Dresser, Llc | Measuring deformation of a compression spring to monitor performance of a safety valve |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2582900A1 (en) * | 2006-03-28 | 2007-09-28 | 2H Offshore Engineering Limited | Sensor |
| CN102087183A (en) * | 2010-12-02 | 2011-06-08 | 中国海洋石油总公司 | Fatigue experiment device for deepwater stand pipe |
| CN102252913A (en) * | 2011-06-16 | 2011-11-23 | 中国海洋大学 | Geometric stiffness test method for deepwater top tension vertical pipe |
| CN102252907A (en) * | 2011-06-16 | 2011-11-23 | 中国海洋大学 | Geometric stiffness test device of deep water top tension type vertical pipe |
| CN102288349A (en) * | 2011-06-16 | 2011-12-21 | 中国海洋大学 | Method for testing top tension and effective tension of deep-water top tension type stand pipe |
-
2011
- 2011-06-16 CN CN 201110161179 patent/CN102279071B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2582900A1 (en) * | 2006-03-28 | 2007-09-28 | 2H Offshore Engineering Limited | Sensor |
| CN102087183A (en) * | 2010-12-02 | 2011-06-08 | 中国海洋石油总公司 | Fatigue experiment device for deepwater stand pipe |
| CN102252913A (en) * | 2011-06-16 | 2011-11-23 | 中国海洋大学 | Geometric stiffness test method for deepwater top tension vertical pipe |
| CN102252907A (en) * | 2011-06-16 | 2011-11-23 | 中国海洋大学 | Geometric stiffness test device of deep water top tension type vertical pipe |
| CN102288349A (en) * | 2011-06-16 | 2011-12-21 | 中国海洋大学 | Method for testing top tension and effective tension of deep-water top tension type stand pipe |
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|---|---|
| CN102279071A (en) | 2011-12-14 |
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