CN113848135A - Method for circularly applying load to deep sea pipeline - Google Patents
Method for circularly applying load to deep sea pipeline Download PDFInfo
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- CN113848135A CN113848135A CN202111106988.6A CN202111106988A CN113848135A CN 113848135 A CN113848135 A CN 113848135A CN 202111106988 A CN202111106988 A CN 202111106988A CN 113848135 A CN113848135 A CN 113848135A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000002474 experimental method Methods 0.000 claims abstract description 33
- 238000004088 simulation Methods 0.000 claims abstract description 10
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 238000012360 testing method Methods 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 description 18
- 230000007246 mechanism Effects 0.000 description 13
- 125000004122 cyclic group Chemical group 0.000 description 12
- 108010066057 cabin-1 Proteins 0.000 description 10
- 238000005452 bending Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
Abstract
The embodiment of the invention discloses a method for circularly applying load to a deep sea pipeline, which comprises the following steps: placing the pipeline to be tested in the experimental cabin, extending a part of a device for applying load into the experimental cabin, and enabling the part of the device to be abutted against the pipeline to be tested; presetting a deep sea pressure environment to be achieved, after the experiment cabin body is sealed, injecting water into the experiment cabin body and exhausting until the pressure in the experiment cabin body reaches a preset range, and completing the simulation of the deep sea environment; after the propulsion distance between the device for applying the load and the pipeline to be tested is adjusted in advance, the device for applying the load positioned outside the experimental cabin body provides continuous reciprocating propulsion force to circularly apply the load to the pipeline to be tested positioned in the experimental cabin body; the reciprocating pushing force at least comprises pushing forces along the axial direction and the radial direction of the pipeline to be tested. The invention aims to simulate the force application condition of the seabed in different environments by adjusting the propelling distance of the device for applying the load relative to the pipeline to be measured on the premise of not replacing the device for applying the load.
Description
Technical Field
The embodiment of the invention relates to the technical field of deep sea pipeline loading experiments, in particular to a method for circularly applying load to a deep sea pipeline.
Background
With the increase of the development of ocean oil and gas resources, a large number of deep sea pipelines are laid and put into use, and in order to ensure the operation stability and safety of the pipelines and research the buckling and crushing mechanism of the pipelines, a pipeline crushing scale ratio test simulating the deep sea environment is required to be carried out. Whether the mode of applying load to the pipeline and the type of applying load accord with the real deep sea environment or not directly influences the reliability and accuracy of the test result. At present, most of test devices for applying load to test pipelines in a high-pressure water tank control force through an oil press, and the axial force application is limited. Also, since the application of force is typically provided by a set mechanism, this results in a constant applied force for each test.
Disclosure of Invention
Therefore, the embodiment of the invention provides a method for circularly applying load to a deep-sea pipeline, which aims to simulate the force application condition of the seabed in different environments by adjusting the propelling distance of a device for applying load relative to the pipeline to be tested on the premise that an experiment cabin body simulates the deep-sea pressure environment and on the premise that the device for applying load is not replaced.
In order to achieve the above object, an embodiment of the present invention provides the following:
in one aspect of an embodiment of the present invention, there is provided a method of applying a load to a deep sea pipeline circulation, including:
s100, placing a pipeline to be tested in an experiment cabin body, extending a part of a device for applying load into the experiment cabin body, and enabling the part to be abutted against the pipeline to be tested;
s200, presetting a deep sea pressure environment to be achieved, and after the experiment cabin body is sealed, injecting water into the experiment cabin body and exhausting until the pressure in the experiment cabin body reaches a preset range, so as to complete the simulation of the deep sea environment;
s300, after the propelling distance between the device for applying the load and the pipeline to be tested is adjusted in advance, providing continuous reciprocating propelling force through the device for applying the load positioned outside the experimental cabin body, and circularly applying the load to the pipeline to be tested positioned in the experimental cabin body; wherein the content of the first and second substances,
the reciprocating pushing force at least comprises pushing forces along the axial direction and the radial direction of the pipeline to be tested.
As a preferred embodiment of the present invention, step S100 specifically includes:
s101, connecting one end of a pipeline to be tested to an end cover at one end of an experiment cabin body through a first flange, positioning the installation position of the pipeline to be tested, and penetrating a load applying device for providing axial pushing force through the end cover of the experiment cabin body and extending to abut against the end face of the pipeline to be tested;
s102, penetrating a pipeline to be tested through a plate body on a load applying device for providing radial pushing force along the axial direction;
s103, connecting the second flange to the other end of the pipeline to be tested, and then connecting the second flange to the end cover at the other end of the experimental cabin body to complete the sealing of the two ends of the experimental cabin body.
As a preferable aspect of the present invention, the step S200 includes:
s201, opening a water injection port and an exhaust port on the experiment cabin body, closing a water outlet, and injecting water into the experiment cabin body through the water injection port;
and S202, when water is discharged through the exhaust port, closing the water injection port and the exhaust port simultaneously, and completing the simulation of the deep sea environment.
As a preferable scheme of the present invention, in step S202, after the water is discharged through the exhaust port, after the water injection port is closed, gas is introduced into the experiment chamber through the exhaust port, and after the pressure in the experiment chamber reaches a preset range, the exhaust port is closed.
As a preferable scheme of the present invention, the experiment chamber is further provided with a pressure sensor, and when the pressure in the experiment chamber is smaller than the preset range, the exhaust port is opened and gas is introduced into the experiment chamber until the pressure reaches the preset range.
As a preferable aspect of the present invention, there are a plurality of advancing distances between the device for applying a load and the pipe to be tested, and the reciprocating pushing force in step S300 is provided to the pipe to be tested by using at least two of the advancing distances.
As a preferable scheme of the present invention, the propelling distance of the reciprocating propelling force includes a primary propelling distance and a secondary propelling distance, and in step S300, the method includes applying a load to the pipeline to be measured in a circulating manner in sequence by using the primary propelling distance and the secondary propelling distance.
In a preferred embodiment of the present invention, the primary propulsion distance is less than the secondary propulsion distance.
The embodiment of the invention has the following advantages:
the invention effectively realizes the cyclic loading of the axial force and the bending moment of the pipeline to be tested in the high-pressure water environment through the synchronous cyclic loading of the driving forces in the axial direction and the radial direction; further through the regulation to the propulsion distance between the pipeline that awaits measuring and the device that is used for exerting load, under the prerequisite of not additionally changing other parts, realize effectively the pertinence simulation to the deep sea application of force under the different environment, provide effectual data support for the follow-up monitoring of the pipeline that awaits measuring.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a flow chart of a method for applying a load to a deep sea pipeline in a circulating manner according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an experimental cabin and a device for applying a load according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the internal structure of the experimental cabin and the device for applying load according to the embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a bending moment cyclic loading mechanism according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an axial cyclic loading mechanism according to an embodiment of the present invention.
In the figure:
1-an experimental cabin; 2-an axial cyclic loading mechanism; 3-bending moment cyclic loading mechanism; 4-a pipeline to be tested;
11-a water injection port; 12-a water outlet; 13-an exhaust port; 14-cabin body support; 15-a front hatch; 16-a rear hatch; 17-a flange;
21-axial force transmission rod; 22-a first eccentric wheel assembly; 23-a first drive member; 24-a first bearing; 25-a motor support;
31-a transmission bracket; 32-a radial drive link;
311-a first plate; 312-a second plate; 313-perforation;
321-a second eccentric wheel assembly; 322-a second drive member; 323-piston rod; 324-moment drive rod; 325 — second bearing.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides a method for applying a load to a deep sea pipeline circulation, comprising:
s100, placing a pipeline 4 to be tested in an experimental cabin 1, extending a part of a device for applying load into the experimental cabin 1, and enabling the part to be abutted against the pipeline 4 to be tested;
s200, presetting a deep sea pressure environment to be achieved, after the experiment cabin body 1 is sealed, injecting water into the experiment cabin body 1 and exhausting until the pressure in the experiment cabin body 1 reaches a preset range, and completing simulation of the deep sea environment;
s300, after the propulsion distance between the device for applying the load and the pipeline 4 to be tested is adjusted in advance, continuous reciprocating propulsion force is provided through the device for applying the load positioned outside the experimental cabin 1, and the pipeline 4 to be tested positioned in the experimental cabin 1 is subjected to cyclic load application; wherein the content of the first and second substances,
the reciprocating pushing force at least comprises pushing forces along the axial direction and the radial direction of the pipeline to be tested.
Specifically, as shown in fig. 2, the device for applying load comprises an axial cyclic loading mechanism 2 and a bending moment cyclic loading mechanism 3, a water injection port 11, a water outlet 12 and an exhaust port 13 are formed on the experimental cabin 1, and a front cabin cover 15 and a rear cabin cover 16 are formed at the front end and the rear end respectively, so that the whole cabin can be formed into an internally closed space through the front cabin cover 15 and the rear cabin cover 16; a cabin bracket 14 for supporting is arranged below the cabin and is used for fixing the spatial position of the cabin. The axial cyclic loading mechanism 2 comprises a first eccentric wheel assembly 22, a first driving piece 23, an axial force transmission rod 21, a first bearing 24 and a motor bracket 25. The axial force transmission rod 21 is connected with the pipeline 4 to be tested through the flange 17 and connected with the first eccentric wheel component 22 through the piston rod piece and the first bearing 24, the first driving piece 23 drives the first eccentric wheel component 22 to rotate, and the motor support 25 is positioned below the first driving piece 23 and fixes the spatial position of the first driving piece 23. The bending moment cyclic loading mechanism 3 comprises a transmission bracket 31, a radial transmission rod 32 (comprising a bending moment transmission rod 324 and a piston rod 323), a second bearing 325, a second eccentric wheel assembly 321, a second driving member 322 and a motor bracket 25. The transmission bracket 31 is connected with the piston rod 323 through the bending moment transmission rod 324, the second bearing 325 connects the piston rod 323 with the second eccentric wheel assembly 321, the second driving member 322 (specifically, a servo motor can be selected) drives the second eccentric wheel assembly 321 to rotate, and the motor bracket 25 is located below the second driving member 322 to fix the spatial position thereof.
In the experimental process, the pipeline 4 to be tested is pushed into the cabin body, the pipeline 4 to be tested sequentially penetrates through the first supporting plate 311 and the through hole 313 in the second supporting plate 312 on the transmission support 31 in the bending moment circulating loading mechanism 3, the transmission support 31 is located in the middle of the pipeline 4 to be tested, the flange 17 is welded to the two ends of the pipeline 4 to be tested, the front end of the pipeline 4 to be tested is connected and fixed with the front cabin cover 15 through the flange 17 by screws, the flange 17 connected with the axial circulating loading mechanism 2 is fixedly connected with the rear end of the pipeline 4 to be tested through screws, and the installation of the experimental cabin body 1 under the whole experimental state is completed. Of course, the axial loading mechanism 2 may be further configured to include the axial force transmission rod 21, and the axial force transmission rod 21 may be connected to the flange 17 through a sleeve structure, so that a certain moving gap may be provided between the axial force transmission rod 21 and the flange 17, thereby effectively achieving the axial pushing of the axial force transmission rod 21.
Further, the transmission bracket 31 may be extended with a radial transmission rod 32, and provide a radial pushing force to the radial transmission rod 32. Meanwhile, since the load is provided for the cyclic reciprocation, in order to avoid the problems of overheating and the like of the conventional hydraulic power unit, the eccentric wheel assembly may be further used to provide the reciprocating driving force to the axial driving rod 21 and the radial driving rod 32. The eccentric assembly can be arranged in an arrangement that is understood by a person skilled in the art, for example, it can comprise an eccentric and a drive element for rotating the eccentric, and the eccentric is connected to the axial drive rod 21 and the radial drive rod 32 by means of a joint rod.
In a further preferred embodiment, in order to better implement effective installation of the pipe 4 to be tested, step S100 specifically includes:
s101, connecting one end of a pipeline 4 to be tested to an end cover (such as a rear cabin cover 16) at one end of the experimental cabin body 1 through a flange 17 at one end, positioning the installation position of the pipeline 1 to be tested, and penetrating a device for applying load for providing axial pushing force through the end cover of the experimental cabin body 1 and extending to abut against the end face of the pipeline 4 to be tested;
s102, enabling the pipeline 4 to be tested to penetrate through plate bodies (namely a first support plate 311 and a second support plate 312) on a device for providing a radial pushing force and applying a load along the axial direction;
s103, connecting the flange 17 at the other end to the other end of the pipeline 4 to be tested, and then connecting the flange 17 with the end cover at the other end of the experiment cabin body 1 to complete the sealing of the two ends of the experiment cabin body 1.
In a further preferred embodiment, the whole water injection process specifically comprises:
s201, opening a water injection port 11 and an exhaust port 13 on the experimental cabin 1, closing a water outlet 12, and injecting water into the experimental cabin 1 through the water injection port 11;
and S202, when water is discharged through the exhaust port 13, closing the water injection port 11 and the exhaust port 13 simultaneously, and completing the simulation of the deep sea environment.
In order to better and effectively realize the simulation of different deep sea states according to practical situations, in a more preferred embodiment, the step S202 further comprises introducing gas into the test chamber 1 through the gas outlet 13 after the water is discharged through the gas outlet 13 and the water injection port 11 is closed, and closing the gas outlet 13 after the pressure in the test chamber 1 reaches a preset range. By further injection of gas, the pressure in the deep sea environment is better simulated.
It should be further explained that a pressure sensor may be further disposed on the inner wall of the experimental cabin 1, and when the internal pressure in the experimental cabin 1 is smaller than the preset range, the exhaust port 13 is opened and gas is introduced into the experimental cabin 1 until the pressure reaches the preset range; when the pressure reaches a preset range, the pressure sensor feeds back a signal and controls the end of the gas injection process.
Of course, in order to better simulate the propulsion process under different environments, the adjustment and the staggering of various propulsion forces are realized by selecting different propulsion distances according to actual conditions, particularly in the process of simulating aging, aging is accelerated by an early-stage aggravated propulsion distance, and data collection is performed by adopting a conventional propulsion distance at a later stage, so that the experimental period is reduced, database information is increased, reliable and higher-reference data are provided, a plurality of propulsion distances are provided between a device for applying a load and a pipeline to be tested, and the reciprocating propulsion force in the step S300 is provided for the pipeline to be tested by adopting at least two propulsion distances.
In a further preferred embodiment, the propelling distance of the reciprocating propelling force includes a primary propelling distance and a secondary propelling distance, and in step S300, the method includes applying a load to the pipeline to be tested in a circulating manner in sequence by using the primary propelling distance and the secondary propelling distance. Further, the primary propulsion distance is less than the secondary propulsion distance.
Of course, in the actual process, three or more stages of propulsion distances may be used to effectively perform better simulation and acceleration, and the present invention is not described herein.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. A method of cyclically applying a load to a deep sea pipeline, comprising:
s100, placing a pipeline to be tested in an experiment cabin body, extending a part of a device for applying load into the experiment cabin body, and enabling the part to be abutted against the pipeline to be tested;
s200, presetting a deep sea pressure environment to be achieved, and after the experiment cabin body is sealed, injecting water into the experiment cabin body and exhausting until the pressure in the experiment cabin body reaches a preset range, so as to complete the simulation of the deep sea environment;
s300, after the propelling distance between the device for applying the load and the pipeline to be tested is adjusted in advance, providing continuous reciprocating propelling force through the device for applying the load positioned outside the experimental cabin body, and circularly applying the load to the pipeline to be tested positioned in the experimental cabin body; wherein the content of the first and second substances,
the reciprocating pushing force at least comprises pushing forces along the axial direction and the radial direction of the pipeline to be tested.
2. The method according to claim 1, wherein step S100 specifically comprises:
s101, connecting one end of a pipeline to be tested to an end cover at one end of an experiment cabin body through a first flange, positioning the installation position of the pipeline to be tested, and penetrating a load applying device for providing axial pushing force through the end cover of the experiment cabin body and extending to abut against the end face of the pipeline to be tested;
s102, penetrating a pipeline to be tested through a plate body on a load applying device for providing radial pushing force along the axial direction;
s103, connecting the second flange to the other end of the pipeline to be tested, and then connecting the second flange to the end cover at the other end of the experimental cabin body to complete the sealing of the two ends of the experimental cabin body.
3. A method according to claim 2, wherein step S200 comprises:
s201, opening a water injection port and an exhaust port on the experiment cabin body, closing a water outlet, and injecting water into the experiment cabin body through the water injection port;
and S202, when water is discharged through the exhaust port, closing the water injection port and the exhaust port simultaneously, and completing the simulation of the deep sea environment.
4. The method of claim 3, wherein step S202, after the water is discharged through the gas outlet, further comprises introducing gas into the test chamber through the gas outlet after the water inlet is closed, and closing the gas outlet after the pressure in the test chamber reaches a predetermined range.
5. A method according to claim 4, characterized in that a pressure sensor is arranged in the test chamber, and when the pressure in the test chamber is less than a predetermined range, the exhaust port is opened and gas is introduced into the test chamber until the pressure reaches the predetermined range.
6. A method according to claim 1 or 2, wherein the advancing distance between the device for applying a load and the pipe to be tested is plural, and the reciprocating pushing force in step S300 is provided to the pipe to be tested by using at least two of the advancing distances.
7. The method of claim 6, wherein the advancing distance of the reciprocating pushing force comprises a primary advancing distance and a secondary advancing distance, and wherein the step S300 comprises applying the load to the pipeline to be tested in a cycle by using the primary advancing distance and the secondary advancing distance in sequence.
8. A method according to claim 7, wherein the primary advance distance is less than the secondary advance distance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111106988.6A CN113848135A (en) | 2021-09-22 | 2021-09-22 | Method for circularly applying load to deep sea pipeline |
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| CN202111106988.6A CN113848135A (en) | 2021-09-22 | 2021-09-22 | Method for circularly applying load to deep sea pipeline |
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