CN209894221U - Pipe-in-pipe system mechanics and fluid flow performance testing device - Google Patents
Pipe-in-pipe system mechanics and fluid flow performance testing device Download PDFInfo
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- CN209894221U CN209894221U CN201920971655.1U CN201920971655U CN209894221U CN 209894221 U CN209894221 U CN 209894221U CN 201920971655 U CN201920971655 U CN 201920971655U CN 209894221 U CN209894221 U CN 209894221U
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Abstract
The utility model belongs to the technical field of the experimental simulation of tubular column mechanics, a pipe-in-pipe system mechanics and fluid flow capability test device is related to. A test cylinder is welded on the base in a sealing manner, an outer pipe is arranged in the test cylinder through an outer pipe adapter connector thread fixedly arranged on the base, a top cover is arranged on the test cylinder at the top of the outer pipe in a sealing manner through a fixing bolt, and the outer pipe is fixedly connected with the top cover in a sealing manner through a chuck; an inner pipe bracket is arranged on the test cylinder above the top cover through a fixing bolt; be provided with the inner tube in the outer tube the utility model discloses an outer tube receives vibration action under the fluid flow condition in water impact, the inner tube to can realize that the size of different tubular columns combination, rivers and the degree of depth of water flow effect to the influence of tubular column, provide strong technical guarantee for deep water, ultra-deep water tubular column operation safety.
Description
Technical Field
The utility model belongs to the technical field of the experimental simulation of tubular column mechanics, a "pipe-in-pipe system" mechanics and fluid flow capability test device is related to.
Background
The tubular column test is an essential link for oil and gas exploration and development, and the main purpose of the tubular column test is to accurately evaluate the deep sea formation fluid characteristics and the potential production of a well to be produced before or in the initial stage of production of an oil and gas reservoir. In the testing process, stratum oil gas flows inside the testing pipe column, well liquid exists between the testing pipe and the marine riser, and the outer portion of the marine riser has impact force of water flow. Under the environment of seawater action, the environmental load borne by the pipe column is severe, the inside and the outside of the test pipe column are affected by fluid action and the interaction force between pipes in a pipe-in-pipe system, so that the performance of the pipe column is affected and the service life of the pipe column is reduced. Therefore, the safety influence of the development on the 'pipe-in-pipe system' under the action of the seawater environment load has important significance. At present, finite elements are mostly used for analyzing the research in the aspect, the research on the influence of real seawater environment load, oil and gas load and interaction between pipes on the pipe column is very little, the influence between the pipes, the influence of marine environment load and oil and gas on the pipe column cannot be fully simulated by the conventional experimental method, and effective guarantee cannot be provided for the safety evaluation of a pipe-in-pipe system.
Disclosure of Invention
The utility model aims to provide a: the testing device for the mechanics and fluid flow performance of the pipe-in-pipe system can accurately simulate the fluid load of the outer pipe, the fluid action in the inner pipe and the action between pipes, research the influence of each factor on the mechanics behavior of the pipe column by changing the combination of the pipe column, the density of fluid between pipes, the flow rate of fluid outside the outer pipe and the action depth of the fluid, visually display the influence of each factor through data and curves, and provide powerful technical support and guarantee for the safety of the test operation of the pipe column.
The technical scheme of the utility model is that:
the utility model provides a pipe-in-pipe system mechanics and fluid flow capability test device, includes inner tube, outer tube, experimental drum, drum inlet tube, bleeder line and base, its characterized in that: a test cylinder is welded on the base in a sealing manner, an outer pipe is arranged in the test cylinder through an outer pipe adapter connector thread fixedly arranged on the base, a top cover is arranged on the test cylinder at the top of the outer pipe in a sealing manner through a fixing bolt, and the outer pipe is fixedly connected with the top cover in a sealing manner through a chuck; an inner pipe adapter is arranged in the outer pipe adapter; an inner pipe bracket is arranged on the test cylinder above the top cover through a fixing bolt; an inner pipe is arranged in the outer pipe, one end of the inner pipe is in threaded connection with the inner pipe adapter, the other end of the inner pipe extends to the upper part of the top cover, and the inner pipe extending to the upper part of the top cover is connected with the inner pipe bracket through a pipe clamp; one side of the test cylinder is provided with a cylinder water inlet pipe, and one end of the cylinder water inlet pipe is communicated with the test cylinder; the other end of the cylinder water inlet pipe is communicated with the water tank, the other side of the test cylinder is provided with a drainage pipe, and one end of the drainage pipe is communicated with the test cylinder; the other end of the drainage pipe is communicated with the water pool, the lower surface of the base is provided with a water inlet pipe, and one end of the water inlet pipe is communicated with the inner pipe through an inner pipe adapter; the other end of the water inlet pipe is communicated with the water pool.
The cylindrical water inlet pipe is provided with a flow regulating pump B and a second flowmeter at intervals; a second flow control valve is arranged on a cylindrical water inlet pipe between the flow regulating pump B and the second flow meter.
The inner pipe extending to the upper part of the top cover is communicated with the water pool through the guide pipe.
The outer wall of the inner pipe is provided with a plurality of first fiber grating sensors at intervals, and the outer wall of the outer pipe is provided with a plurality of second fiber grating sensors at intervals. And each fiber grating sensor is connected with a computer through a photoelectric converter and a data acquisition instrument.
The water inlet pipe is provided with a first flow meter and a flow regulating pump A at intervals, and a water outlet pipe between the first flow meter and the flow regulating pump A is provided with a first flow control valve.
And a discharge hole is formed in the base between the outer pipe adapter and the inner pipe adapter and is communicated with the outer pipe through the outer pipe adapter. The discharge hole is provided with a plug in a threaded manner.
The utility model has the advantages that:
1. the dynamic change behavior under the conditions that an outer pipe of a pipe-in-pipe system is impacted by outflow, flowing fluid exists in an inner pipe and interaction exists between the pipes can be simulated under the environment of inflow and outflow;
2. the influence of different pipe column combinations and different inter-pipe fluid densities on the pipe columns can be realized;
3. the influence of the outer pipe on the conditions of different flow velocity and different action depths and the static fluid and no fluid of the outer pipe;
4. the test string is acted by internal and external fluids, the speed of the fluid in the string can be changed by adjusting the pump B, and factors influencing the performance of the string can be accurately known.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;
FIG. 3 is an enlarged view of the structure at B in FIG. 1;
fig. 4 is a structure diagram of the measuring system of the present invention.
In the figure: 1. the device comprises an inner pipe, 2, an outer pipe, 3, a test cylinder, 4, a cylinder water inlet pipe, 5, a drainage pipe, 6, a base, 7, an outer pipe conversion joint, 8, a top cover, 9, a chuck, 10, an inner pipe support, 11, a water inlet pipe, 12, a water tank, 13, a flow guide pipe, 14, a flow regulating pump B, 15, a second flow meter, 16, a second flow control valve, 17, a first fiber grating sensor, 18, a second fiber grating sensor, 19, a first flow meter, 20, a flow regulating pump A, 21, a first flow control valve, 22, a drainage hole, 23, a plug, 24 and an inner pipe conversion joint.
Detailed Description
The device for testing the mechanics and fluid flow performance of the pipe-in-pipe system comprises an inner pipe 1, an outer pipe 2, a testing cylinder 3, a cylinder water inlet pipe 4, a drain pipe 5 and a base 6. A test cylinder 3 is welded on the base 6 in a sealing way, an outer tube 2 is installed in the test cylinder 3 through an outer tube adapter 7 fixedly installed on the base 6 in a threaded way, and an inner tube adapter 24 is arranged in the outer tube adapter 7; an exhaust hole 22 is formed in the base 6 between the outer pipe adapter 7 and the inner pipe adapter 24, a plug 23 is screwed on the exhaust hole 22, and the exhaust hole 22 is communicated with the outer pipe 2 through the outer pipe adapter 7. A top cover 8 is installed on the test cylinder 3 at the top of the outer pipe 2 in a sealing mode through a fixing bolt, and the outer pipe 2 is fixedly connected with the lower surface of the top cover 8 in a sealing mode through a chuck 9.
An inner pipe bracket 10 is arranged on the test cylinder 3 above the top cover 8 through a fixing bolt; an inner pipe 1 is arranged in the outer pipe 2, one end of the inner pipe 1 is in threaded connection with an inner pipe adapter 24, and the lower end of the inner pipe 1 extends to the lower end of the base 6 through a water inlet pipe 11 and is communicated with a water tank 12. The first flow meter 19 and the flow regulating pump A20 are installed on the water inlet pipe 11 at intervals, and the first flow control valve 21 is installed on the water outlet pipe between the first flow meter and the flow regulating pump A.
The other end (upper end) of the inner pipe 1 extends to the upper part of the top cover 8, the inner pipe 1 extending to the upper part of the top cover 8 is connected with the inner pipe bracket 10 through a pipe clamp and is communicated with the water tank 12 through a guide pipe 13, and therefore, a working cycle is formed among the water inlet pipe 11, the inner pipe 1, the guide pipe 13 and the water tank 12. A plurality of first fiber grating sensors 17 are arranged on the outer wall of the inner tube 1 at intervals, and a plurality of second fiber grating sensors 18 are arranged on the outer wall of the outer tube 2 at intervals. The first fiber grating sensor 17 and the second fiber grating sensor 18 are respectively connected with a computer through a photoelectric converter and a data acquisition instrument.
A cylinder water inlet pipe 4 is arranged on one side of the test cylinder 3, and one end of the cylinder water inlet pipe 4 is communicated with the test cylinder 3; the other end of the cylindrical water inlet pipe 4 is communicated with the water pool 12, and a flow regulating pump B14 and a second flowmeter 15 are arranged on the cylindrical water inlet pipe 4 at intervals; a second flow control valve 16 is installed on the water inlet pipe between the flow regulating pump B14 and the second flow meter 15.
The other side of the test cylinder 3 is provided with a drain pipe 5, and one end of the drain pipe 5 is communicated with the test cylinder 3; the other end of the drain pipe 5 communicates with a sump 12.
The test method comprises the following steps:
firstly, a fixed pulley is arranged above the experimental device by means of a mounting frame or a laboratory ceiling, then a tension rope is arranged on the fixed pulley, one end of the tension rope is connected with the inner pipe 1 in a tying mode, and the other end of the tension rope is tied with a balancing weight which is 5 times of the weight of the inner pipe 1, so that an upward tension (tension) is applied to the inner pipe 1; checking the experimental device and the connection points to ensure that the experimental device has an operation state of acquiring accurate data after starting up and debugging are carried out after omission;
calibrating each fiber grating sensor before the experiment, and simultaneously resetting debugging data to prepare for acquiring data in the experiment process; at the same time, the intermediate liquid is injected from the inlet 24 provided on the top cover 8 above the outer tube 2 to fill the outer tube 2, and when the intermediate liquid needs to be replaced, the plug 23 on the drain hole 22 is rotated and removed.
Starting the flow regulating pump B14 to fill the space between the outer pipe 2 and the experiment cylinder 3 with fluid (simulated ocean current), then regulating the flow of the flow regulating pump B14 to a set value to make the speed of the fluid in the experiment cylinder 3 be 0.2m/s, and starting the flow regulating pump A20 to regulate the flow to a set value to make the speed of the fluid in the inner pipe be 1.5 m/s; to simulate ocean currents; after the simulated ocean current is stable, data measured by each fiber grating sensor (the measured data comprises vibration frequency, displacement, amplitude and the like of the outer pipe and the inner pipe) are processed by a photoelectric converter, transmitted to a data acquisition instrument for data acquisition, and then transmitted to a computer for storage;
the experimental data acquisition time lasts for more than 5min, and then all the fiber bragg grating sensors, the flow regulating pump B14 and the flow regulating pump A20 are closed; after the data are stored, resetting the data of the sensor and the acquisition instrument for next data acquisition; respectively starting a flow regulating pump A20 and a flow regulating pump B14, then increasing the outflow flow rate by 0.08m/s by regulating a second flow control valve 16, starting each fiber grating sensor after the flow rate is stable, and collecting deformation data of 5 points on the inner tube and the outer tube; 5 groups of data corresponding to different outflow velocities need to be collected;
changing different types of the outer pipe 2 and the inner pipe 1, adjusting a first flow control valve 21 to increase the flow rate of the inner pipe 1 by 0.15m/s, starting each fiber grating sensor after the flow rate is stable, collecting data of the inner pipe and the outer pipe in different pipe column combinations, collecting 5 groups of data corresponding to the flow rates of the inner pipe in total, recording experimental data collected by each fiber grating sensor, changing different types of the outer pipe 2 and the inner pipe 1 according to the combination of the inner pipe and the outer pipe commonly used in the field, carrying out experiments on 5 different pipe column combinations, repeating the step 4) ~ 7), recording the experimental data collected by the fiber grating sensors, changing different flow guide pipes 13, changing the diameter of a central hole of the flow guide pipes, changing the length of the fluid acting on the pipe columns, so as to study the influence of different acting depths of ocean currents on the pipe columns, repeating the step 4) ~ 7), recording the experimental data collected by each fiber grating sensor, carrying out 5 groups of experiments in total, directly measuring the obtained data as optical signal wavelength, obtaining the strain of the pipe columns by a conversion formula of wavelength and the pipe column micro-column strain, then obtaining the strain of the pipe columns by a surface modal analysis of the strain of the pipe columns, and obtaining the strain of:
the data obtained by the direct measurement of the experiment is the wavelength of the optical signal, the strain of the tubular column can be obtained through a conversion formula of the wavelength and the micro strain of the tubular column, and the stress of the tubular column can be obtained according to the hooke's law.
Modal analysis solves for displacement response: according to the theory of structural dynamics, the length of the column, L, is the vibrational displacement
Can be written as:
wherein
. Since the two ends of the experimental pipe column are simply supported, the vibration mode function in the formula can be taken as a sine function, namely
According to the geometrical relationship of deformation in material mechanics, the strain of a certain point in bending deformation is obtained as follows:whereinIs the distance from the neutral layer;
the radius of curvature of the neutral layer. Therefore, the relationship between the strain and the curvature radius at a certain point on the surface of the tubular column is as follows:(ii) a Wherein the content of the first and second substances,
is the radius of the pipe string. From higher mathematics, the plane curve
The curvature of any point above is:
because the deformation in engineering practice is generally very small, the deflection line is an extremely flat curve, and the deflection and corner numerical values are very small. Thus, the value is smaller than 1 and can be ignored, and the relationship between the curvature and the second derivative of displacement is obtained as:
。
from the above, the relationship between strain and second derivative of displacement is:
substituting the measured strain data into a formula to obtain a modal function
Substituting the mode function into the formula
So as to obtain each point of the pipe column modelThe displacement response of (c).
And performing spectrum analysis on the displacement response, performing Fast Fourier Transform (FFT) on the obtained displacement response by using MATLAB software, wherein the abscissa in the transformed image represents frequency, the ordinate represents amplitude, a plurality of peak values exist in the image, and the abscissa corresponding to each peak value is the characteristic frequency of the tubular column.
And analyzing the vibration frequency spectrum, stress, strain and displacement of the pipe column by using all factors, thereby obtaining the mechanical behavior of the pipe-in-pipe system in the marine environment and the influence rule of all factors on the performance of the pipe column.
Claims (7)
1. The utility model provides a pipe-in-pipe system mechanics and fluid flow capability test device, includes inner tube (1), outer tube (2), experimental drum (3), drum inlet tube (4), bleeder tube (5) and base (6), its characterized in that: a test cylinder (3) is welded on the base (6) in a sealing manner, an outer tube (2) is installed in the test cylinder (3) through an outer tube adapter (7) fixedly installed on the base (6) in a threaded manner, a top cover (8) is installed on the test cylinder (3) at the top of the outer tube (2) in a sealing manner through a fixing bolt, and the outer tube (2) is fixedly connected with the top cover (8) in a sealing manner through a chuck (9); an inner pipe bracket (10) is arranged on the test cylinder (3) above the top cover (8) of the inner pipe adapter (24) in the outer pipe adapter (7) through a fixing bolt; an inner pipe (1) is arranged in the outer pipe (2), one end of the inner pipe (1) is in threaded connection with an inner pipe adapter (24), the other end of the inner pipe (1) extends to the position above the top cover (8), and the inner pipe (1) extending to the position above the top cover (8) is connected with an inner pipe support (10) through a pipe clamp; a cylinder water inlet pipe (4) is arranged on one side of the test cylinder (3), and one end of the cylinder water inlet pipe (4) is communicated with the test cylinder (3); the other end of the cylinder water inlet pipe (4) is communicated with the water pool (12), the other side of the test cylinder (3) is provided with a drainage pipe (5), and one end of the drainage pipe (5) is communicated with the test cylinder (3); the other end of the drainage pipe (5) is communicated with a water pool (12), a water inlet pipe (11) is arranged on the lower surface of the base (6), and one end of the water inlet pipe (11) is communicated with the inner pipe (1) through an inner pipe adapter (24); the other end of the water inlet pipe (11) is communicated with the water pool (12).
2. The device for testing the mechanical and fluid flow properties of a pipe-in-pipe system according to claim 1, wherein: a flow regulating pump B (14) and a second flowmeter (15) are arranged on the cylindrical water inlet pipe (4) at intervals; a second flow control valve (16) is arranged on the cylinder water inlet pipe (4) between the flow regulating pump B (14) and the second flow meter (15).
3. The device for testing the mechanical and fluid flow properties of a pipe-in-pipe system according to claim 1, wherein: the inner pipe (1) extending to the upper part of the top cover (8) is communicated with the water pool (12) through the guide pipe (13).
4. The device for testing the mechanical and fluid flow properties of a pipe-in-pipe system according to claim 3, wherein: a plurality of first fiber grating sensors (17) are arranged on the outer wall of the inner pipe (1) at intervals, and a plurality of second fiber grating sensors (18) are arranged on the outer wall of the outer pipe (2) at intervals; and each fiber grating sensor is connected with a computer through a photoelectric converter and a data acquisition instrument.
5. The device for testing the mechanical and fluid flow properties of a pipe-in-pipe system according to claim 1, wherein: the water inlet pipe (11) is provided with a first flow meter (19) and a flow regulating pump A (20) at intervals, and a first flow control valve (21) is arranged on the water inlet pipe (11) between the first flow meter (19) and the flow regulating pump A (20).
6. The device for testing the mechanical and fluid flow properties of a pipe-in-pipe system according to claim 1, wherein: and a discharge hole (22) is formed in the base (6) between the outer pipe adapter (7) and the inner pipe adapter (24), and the discharge hole (22) is communicated with the outer pipe (2) through the outer pipe adapter (7).
7. The device for testing the mechanical and fluid flow properties of a pipe-in-pipe system according to claim 6, wherein: the drain hole (22) is provided with a plug (23) in a threaded manner.
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| CN201920971655.1U CN209894221U (en) | 2019-06-26 | 2019-06-26 | Pipe-in-pipe system mechanics and fluid flow performance testing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174141A (en) * | 2019-06-26 | 2019-08-27 | 长江大学 | A kind of pipe-in-pipe systems mechanics and fluid flow performance test device and test method |
| CN112878985A (en) * | 2021-01-15 | 2021-06-01 | 中国石油大学(北京) | Simulation experiment device and simulation experiment method for recoil mechanical characteristics |
-
2019
- 2019-06-26 CN CN201920971655.1U patent/CN209894221U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174141A (en) * | 2019-06-26 | 2019-08-27 | 长江大学 | A kind of pipe-in-pipe systems mechanics and fluid flow performance test device and test method |
| CN110174141B (en) * | 2019-06-26 | 2023-08-01 | 长江大学 | Device and method for testing mechanical and fluid flow properties of pipe-in-pipe system |
| CN112878985A (en) * | 2021-01-15 | 2021-06-01 | 中国石油大学(北京) | Simulation experiment device and simulation experiment method for recoil mechanical characteristics |
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