CN106768844B - Experimental device and experimental method for sand blocking of elbow pipe and sand carrying of vertical pipe in marine oil and gas conveying process - Google Patents
Experimental device and experimental method for sand blocking of elbow pipe and sand carrying of vertical pipe in marine oil and gas conveying process Download PDFInfo
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- CN106768844B CN106768844B CN201710038894.7A CN201710038894A CN106768844B CN 106768844 B CN106768844 B CN 106768844B CN 201710038894 A CN201710038894 A CN 201710038894A CN 106768844 B CN106768844 B CN 106768844B
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/04—Investigating sedimentation of particle suspensions
Abstract
The invention discloses an experimental device and an experimental method for sand blocking of an elbow pipe and sand carrying of a vertical pipe in the marine oil and gas conveying process, wherein the experimental device comprises a vertical pipe section, an elbow pipe section, a sand adding tank, a gas supply system, a water supply system, a data acquisition system and a sand movement monitoring system; the vertical pipe section and the bent pipe section form an integrated L-shaped pipe section, the air supply system and the water supply system are connected with the air-liquid mixer, the sand adding tank, the bent pipe section and the vertical pipe section are sequentially connected after the air-liquid mixer, the data acquisition system acquires pressure signals on the air supply pipeline, the air-liquid mixing pipeline, the bent pipe section and the vertical pipe section, and the sand movement monitoring system monitors sand states in the bent pipe section and the vertical pipe section. According to the invention, the movement conditions of sand grains with different particle diameters are measured according to different conveying working conditions, and the conditions required by restarting after the sand grains block the bent pipe under the condition of equal size are obtained, so that the basis is provided for risk assessment of sand blocking of the pipeline under different conveying working conditions, and safe and efficient production and operation of marine oil gas are realized.
Description
Technical Field
The invention belongs to the technical field of ocean oil and gas exploitation, and particularly relates to an experimental device for elbow sand blocking and riser sand carrying in an ocean oil and gas conveying process.
Background
In the process of exploiting submarine petroleum and natural gas, after being filtered by wellhead equipment, the well flow medium still carries tiny sand grains and trace gas, and along with the change of the flow speed and the movement direction in the conveying process, especially when the flow speed of liquid is smaller, the sand grains are extremely easy to deposit in a curved pipe section and a vertical pipe section with larger curvature in the subsequent pipeline conveying process, and the sand grains can be blocked when serious, so that normal production is influenced.
In addition, the sedimentation characteristics of the particles are obviously influenced by the flow characteristics of the medium, and the method for determining the movement condition of the sand carried by the medium has great significance for safe operation of the transported medium. Therefore, detailed experimental research is required to be carried out on the fluid sand carrying capacity and sand depositing characteristics in the submarine pipeline conveying process, and conditions required by determining the sand carrying capacity, the sand blocking restarting and the like of the conveying pipeline provide basis for risk assessment of sand blocking at specific positions of the pipeline under different conveying working conditions.
Disclosure of Invention
Aiming at the problems of sand blockage of the elbow pipe and sand carrying of the vertical pipe in the marine oil and gas conveying process, the invention provides an experimental device for sand blockage of the elbow pipe and sand carrying of the vertical pipe in the marine oil and gas conveying process, the motion conditions of sand grains with different grain diameters are measured according to different conveying working conditions, and meanwhile, the conditions required by restarting after sand blockage under the condition of equal-size elbow pipe sections are obtained, so that basis is provided for risk assessment of sand blockage of a pipeline under different conveying working conditions, and safe and efficient production operation of the marine oil and gas is realized.
In order to realize the functions, the invention adopts the following technical scheme:
an experimental device for sand blocking of an elbow pipe and sand carrying of a vertical pipe in the marine oil and gas conveying process comprises a vertical pipe section, an elbow pipe section, a sand adding tank, a gas supply system, a water supply system, a data acquisition system and a sand movement monitoring system; the sand grain motion monitoring system is characterized in that the vertical pipe section and the bent pipe section are integrated into an L-shaped pipe section, the air supply system and the water supply system are connected with the air-liquid mixer, the sand adding tank, the bent pipe section and the vertical pipe section are sequentially connected after the air-liquid mixer, the data acquisition system is used for respectively acquiring pressure signals on the air supply pipeline, the air-liquid mixing pipeline, the bent pipe section and the vertical pipe section, and the sand grain motion monitoring system is used for monitoring sand grain states in the bent pipe section and the vertical pipe section.
Preferably, the air supply system comprises a compressor and an air supply pipeline, wherein the compressor is sequentially connected with a buffer tank, an air flow meter and a first pressure transmitter through the air supply pipeline;
the water supply system comprises a water storage tank and a water supply pipeline, wherein the water storage tank is sequentially connected with a centrifugal pump and a liquid flowmeter through the water supply pipeline;
the gas and liquid provided by the gas supply pipeline and the water supply pipeline are mixed through a gas-liquid mixer, a second pressure transmitter is arranged on the gas-liquid mixing pipeline, the gas-liquid mixing pipeline is connected with a sand adding tank, and the sand adding tank is sequentially connected with a bent pipe section and a vertical pipe section;
A first sand adding funnel controlled by a first ball valve is arranged above the sand adding tank, and a stirrer is arranged inside the sand adding tank;
the top of the vertical pipe section is provided with a second sand adding funnel controlled by a second ball valve, the bent pipe section and the vertical pipe section are sequentially provided with a third pressure transmitter, a fourth pressure transmitter, a fifth pressure transmitter, a sixth pressure transmitter and a seventh pressure transmitter, the fifth pressure transmitter, the sixth pressure transmitter and the seventh pressure transmitter correspond to the vertical pipe section, the vertical pipe section is sequentially provided with a down sampling valve, a middle sampling valve and an up sampling valve, and the vertical pipe section is also provided with a scale; a medium outflow port at the top of the vertical pipe section is provided with a return pipeline communicated with the water storage tank, and screening equipment is arranged on the return pipeline;
the data acquisition system comprises a data acquisition card, and the data acquisition card is respectively connected with a first pressure transmitter, a second pressure transmitter, a third pressure transmitter, a fourth pressure transmitter, a fifth pressure transmitter, a sixth pressure transmitter and a seventh pressure transmitter through lines;
the sand movement monitoring system comprises a high-speed camera which is used for shooting and monitoring sand movement conditions in the bent pipe section and the vertical pipe section in the experimental process.
Preferably, a first valve is arranged on a pipeline between the compressor and the buffer tank, a second valve is arranged on a pipeline between the buffer tank and the gas flowmeter, and a third valve is arranged on a pipeline between the first pressure transmitter and the gas-liquid mixer; and a fourth valve is arranged on a pipeline between the water storage tank and the centrifugal pump, a fifth valve is arranged on a pipeline between the centrifugal pump and the liquid flowmeter, and a sixth valve is arranged on a pipeline between the liquid flowmeter and the gas-liquid mixer.
Preferably, the bend pipe section, the vertical pipe section and the sand adding tank are all transparent organic glass pipes.
The experimental device for sand blocking of the elbow pipe and sand carrying of the vertical pipe in the marine oil and gas conveying process comprises the following steps of:
step one: initially, the valves of the whole experimental device are in a closed state, and the whole experimental device is filled with gas; firstly, sequentially opening a fourth valve, a fifth valve and a sixth valve, and pumping water in a water storage tank into a sand adding tank, a bent pipe section and a vertical pipe section through a centrifugal pump; secondly, slowly adjusting the lift of the centrifugal pump to maintain the liquid level in the vertical pipe section above a graduated scale of the vertical pipe section and prevent water from entering the screening equipment; and then, the first ball valve is slowly regulated to enable all the gas in the sand adding tank to be discharged, the first valve, the second valve and the third valve are sequentially opened according to whether the gas enters, the compressor is rapidly opened to regulate the gas quantity, and after a period of time, stable gas quantity enters the riser section through the bent pipe section; finally, opening a data acquisition card and a high-speed camera, and beginning to record data of the second pressure transmitter, the third pressure transmitter, the fourth pressure transmitter, the fifth pressure transmitter, the sixth pressure transmitter and the seventh pressure transmitter;
Step two: firstly, a second ball valve is opened, a prepared sand suspension with a certain particle size and a certain solubility is added into a riser section through a second sand adding funnel, then the second ball valve is closed, the movement condition of sand in the riser section is observed through a high-speed camera, when sand is settled to the bottom of the riser section, a centrifugal pump is regulated to slowly change the liquid flow, meanwhile, pressure information of a fifth pressure transmitter, a sixth pressure transmitter and a seventh pressure transmitter on the riser section, acquired through a data acquisition card, shooting monitoring information of the sand condition in the riser section through the high-speed camera, and the movement condition of the sand in the riser section is observed by referring to a scale on the riser section, and the movement speed of the sand is obtained by measuring the time of the sand passing through different scale marks, so as to judge whether the sand is balanced in the riser section; secondly, respectively opening a lower sampling valve, a middle sampling valve and an upper sampling valve on the vertical pipe section to sample sand grains at different positions in the vertical pipe section, and then measuring the change of the solubility of the sand grains at different positions in the vertical pipe section, wherein the corresponding liquid phase flow rate is the critical flow rate corresponding to the size of the particles at the concentration; and finally, recording the pressure signal acquired by the data acquisition card, the video shot by the high-speed camera, the measured sand movement rule and critical flow rate and the acquired solubility change.
Step three: and after the step II is finished, the centrifugal pump is readjusted to increase the liquid amount, the sand grains remained in the vertical pipe section are carried out, the step I is repeated, the second ball valve is opened, sand grains with different particle sizes and solubilities are added into the vertical pipe section through the second sand adding hopper to carry out the next experiment, and the step II is repeated.
Preferably, the residual sand carried out from the riser section in the third step is screened by a screening device on the return pipeline through a medium outflow opening at the top of the riser section, the sand is separated, and water flows back to the water storage tank for recycling.
The experimental device for sand blocking of the elbow and sand carrying of the vertical pipe in the marine oil and gas conveying process comprises the following steps of:
step one: initially, the valves of the whole experimental device are in a closed state, and the whole experimental device is filled with gas; firstly, sequentially opening a fourth valve, a fifth valve and a sixth valve, and enabling water in a water storage tank to sequentially enter a sand adding tank, a bent pipe section and a vertical pipe section through centrifugal pumping; secondly, slowly adjusting the lift of the centrifugal pump to maintain the liquid level in the vertical pipe section above a graduated scale of the vertical pipe section and prevent water from entering the screening equipment; furthermore, the first ball valve is slowly adjusted to enable all the gas in the sand adding tank to be discharged; finally, opening a data acquisition card and a high-speed camera, and beginning to record data of the fourth pressure transmitter, the fifth pressure transmitter, the sixth pressure transmitter and the seventh pressure transmitter;
Step two: first, opening the second ball valve, adding a certain amount of sand suspension with certain size into the vertical pipe section through the second sand adding hopper until the bottom bent pipe section 34 of the vertical pipe section is completely blocked; secondly, adjusting the increasing frequency of the centrifugal pump, and opening a pipeline of the bent pipe section when the pressure of the upstream of the bent pipe section reaches a certain value; thirdly, regulating the centrifugal pump to continuously increase the liquid flow, observing the change of the caliber of the pipeline after stabilizing at different flow rates, and recording data; finally, analyzing the pressure information of the second pressure transmitter, the third pressure transmitter, the fourth pressure transmitter, the fifth pressure transmitter, the sixth pressure transmitter and the seventh pressure transmitter acquired by the data acquisition card in the whole experimental process to obtain the critical pressure difference of the pipeline opening under the working condition;
step three: changing the grain size of sand grains and the quantity of sand grains, and repeating the first step to obtain pressure difference data and change data of the caliber of a pipeline required by restarting the elbow pipe sand plug under different working conditions;
step four: after the experiment is completed, the gas-liquid flow is increased, and the rest sand grains are carried out of the bent pipe section.
The experimental device for sand blocking of an elbow pipe and sand carrying of a vertical pipe in the marine oil and gas conveying process comprises the following steps of:
Step one: initially, the valves of the whole experimental device are in a closed state; firstly, opening a first ball valve, and adding a certain amount of sand grain suspension with a certain size into a sand adding tank through a first sand adding hopper until an inlet pipeline of the sand adding tank is blocked; secondly, sequentially opening a fourth valve, a fifth valve, a sixth valve, a first valve, a second valve and a third valve, and regulating the gas-liquid flow to a certain value until the pipeline is opened and stabilized; furthermore, the caliber of the pipeline after the gas-liquid flow is regulated and stabilized under different working conditions is recorded; finally, analyzing the pressure information of the second pressure transmitter, the third pressure transmitter, the fourth pressure transmitter, the fifth pressure transmitter, the sixth pressure transmitter and the seventh pressure transmitter acquired by the data acquisition card in the whole experimental process to obtain the maximum pressure difference when the pipeline is opened;
step two: changing the grain size of sand grains and the quantity of the sand grains, and repeating the first step to obtain pressure difference data required by restarting the sand plug of the sand adding tank under different working conditions;
step three: after the experiment is finished, the stirrer is opened, the air flow is opened, and the residual sand grains are removed from the sand adding tank.
The experimental device for sand blocking of the elbow and sand carrying of the vertical pipe in the marine oil and gas conveying process is used for researching sand adding tank and sand blocking experiment of the elbow, and comprises the following steps:
Meanwhile, the sand is added to block the bent pipe section and the sand adding tank, and the gas-liquid flow is regulated to obtain pressure data when the pipeline is opened and the caliber of the pipeline is changed at different flow rates.
Preferably, the media used throughout the experiment described above are water, air and quartz sand.
The beneficial effects of the invention are as follows: according to different conveying working conditions, the movement conditions of sand grains with different particle diameters are measured, and meanwhile, the conditions required by restarting after sand grains block a bent pipe section under the condition of equal size are obtained, so that basis is provided for risk assessment of sand blocking of pipelines under different conveying working conditions, and safe and efficient production and operation of marine oil gas are realized. Specifically, through providing the experimental device for the sand blocking of the elbow pipe and the sand carrying of the vertical pipe in the marine oil and gas conveying process, and obtaining the motion condition of tiny sand grains in the oil and gas conveying process through experiments, measuring the motion state of sand grains with different grain diameters when balanced, respectively blocking and coupling influences of the elbow pipe and the sand adding tank with the same size as the oil and gas conveying vertical pipe, obtaining the time required by restarting the sand blocking at the corresponding flow rate, the change of the front-back pressure difference of the sand blocking device, the change of the caliber of the pipeline and the like, carrying sand capacity and sand deposition characteristics of fluid in the pipeline in the conveying process are subjected to detailed experimental study, and determining the sand carrying capacity of the vertical pipe, the conditions required by restarting the sand blocking and the like provide basis for risk assessment of the sand blocking of the pipeline under different conveying working conditions.
Drawings
FIG. 1 is a schematic diagram of an experimental device for sand plugging of an elbow and sand carrying of a riser in the marine oil and gas transportation process of the invention;
FIG. 2 is a schematic illustration of a specific construction of the sand tank sand of FIG. 1;
fig. 3 is a schematic illustration of the specific construction of the elbow and riser sections of fig. 1.
Wherein: 1-compressor, 2-first valve, 3-buffer tank, 4-second valve, 5-gas flow meter, 6-third valve, 7-first pressure transmitter, 8-fourth valve, 9-centrifugal pump, 10-fifth valve, 11-liquid flow meter, 12-sixth valve, 13-gas-liquid mixer, 14-second pressure transmitter, 15-sand tank, 16-third pressure transmitter, 17-fourth pressure transmitter, 18-first ball valve, 19-first sand hopper, 20-fifth pressure transmitter, 21-downsampling valve, 22-sixth pressure transmitter, 23-middle sampling valve, 24-scale ruler, 25-seventh pressure transmitter, 26-upsampling valve, 27-second ball valve, 28-second sand hopper, 29-high speed camera, 30-screening device, 31-water storage tank, 32-data acquisition card, 33-stirrer, 34-bend, 35-vertical tube section.
Detailed Description
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic diagram of an experimental device for sand plugging of an elbow and sand carrying of a riser in the marine oil and gas transportation process of the invention; FIG. 2 is a schematic illustration of a specific construction of the sand tank sand of FIG. 1; fig. 3 is a schematic illustration of the specific construction of the elbow and riser sections of fig. 1.
1-3, an experimental device for elbow sand blocking and riser sand carrying in marine oil and gas conveying process comprises a riser section 35, a elbow section 34, a sand adding tank 15, a gas supply system, a water supply system, a data acquisition system and a sand movement monitoring system; wherein the middle pipe section 35 and the bent pipe section 34 are integrated into an L-shaped pipe section, the air supply system and the water supply system are connected with the gas-liquid mixer 13, the gas-liquid mixer 13 is sequentially connected with the sand adding tank 15, the bent pipe section 34 and the vertical pipe section 35, namely, the upstream of the bent pipe section 34 is connected with the sand adding tank 15, and the downstream of the bent pipe section 34 is communicated with the vertical pipe section 35; the data acquisition system is used for respectively acquiring pressure signals on the air supply pipeline, the air-liquid mixing pipeline, the bent pipe section 34 and the vertical pipe section 35, and the sand movement monitoring system is used for monitoring sand states in the bent pipe section 34 and the vertical pipe section 35.
Preferably, the air supply system comprises a compressor 1 and an air supply pipeline, wherein the compressor 1 is sequentially connected with a buffer tank 3, a gas flowmeter 5 and a first pressure transmitter 7 through the air supply pipeline;
the water supply system comprises a water storage tank 31 and a water supply pipeline, wherein the water storage tank 31 is sequentially connected with a centrifugal pump 9 and a liquid flowmeter 11 through the water supply pipeline;
The gas and liquid provided by the gas supply pipeline and the water supply pipeline are mixed through a gas-liquid mixer 13, a second pressure transmitter 14 is arranged on the gas-liquid mixing pipeline, the gas-liquid mixing pipeline is connected with a sand adding tank 15, and the sand adding tank 15 is sequentially connected with a bent pipe section 34 and a vertical pipe section 35;
a first sand adding funnel 19 controlled by a first ball valve 18 is arranged above the sand adding tank 15, and a stirrer 33 is arranged inside the sand adding tank 15;
the top of the vertical pipe section 35 is provided with a second sand adding funnel 28 controlled by a second ball valve 27, the bent pipe section 34 and the vertical pipe section 35 are sequentially provided with a third pressure transmitter 16, a fourth pressure transmitter 17, a fifth pressure transmitter 20, a sixth pressure transmitter 22 and a seventh pressure transmitter 25, wherein the vertical pipe section 35 is sequentially provided with a lower sampling valve 21, a middle sampling valve 23 and an upper sampling valve 26 corresponding to the fifth pressure transmitter 20, the sixth pressure transmitter 22 and the seventh pressure transmitter 25, and the vertical pipe section 35 is additionally provided with a scale 24;
the data acquisition system comprises a data acquisition card 32, wherein the data acquisition card 32 is respectively connected with the first pressure transmitter 7, the second pressure transmitter 14, the third pressure transmitter 16, the fourth pressure transmitter 17, the fifth pressure transmitter 20, the sixth pressure transmitter 22 and the seventh pressure transmitter 25 through lines, so as to acquire pressure signals on corresponding pipelines;
The sand movement monitoring system includes a high speed camera 19, wherein the high speed camera 19 is used to monitor the sand movement in the bend section 34 and riser section 35 during the course of the experiment.
Preferably, the medium outflow opening at the top of the riser section 35 is provided with a return line communicating with the water storage tank 31, wherein the return line is provided with a screening device 30, and the screening device 30 is used for screening the water-sand-gas mixture carried out from the riser section 35, separating sand particles and making water flow back into the water storage tank 31 for recycling.
Preferably, a first valve 2 is arranged on a pipeline between the compressor 1 and the buffer tank 3 on an air supply pipeline of the air supply system, a second valve 4 is arranged on a pipeline between the buffer tank 3 and the air flow meter 5, and a third valve 6 is arranged on a pipeline between the first pressure transmitter 7 and the air-liquid mixer 13; and a fourth valve 8 is arranged on a pipeline between the water storage tank 31 and the centrifugal pump 9 on a water supply pipeline of the water supply system, a fifth valve 10 is arranged on a pipeline between the centrifugal pump 9 and the liquid flowmeter 11, and a sixth valve 12 is arranged on a pipeline between the liquid flowmeter 11 and the gas-liquid mixer 13.
Preferably, the bend section 34, riser section 35 and sanding tank 15 all employ clear plexiglas tubing.
The invention provides an experimental device for sand blocking of an elbow pipe and sand carrying of a vertical pipe in the marine oil and gas conveying process, which is used for researching the concrete operation of the sand carrying experiment of the vertical pipe, and comprises the following steps:
step one: initially, the valves of the whole experimental device are in a closed state, and the whole experimental device is filled with gas; firstly, sequentially opening a fourth valve 8, a fifth valve 10 and a sixth valve 12, and pumping water in a water storage tank 30 into a sand adding tank 15, a bent pipe section 34 and a vertical pipe section 35 through a centrifugal pump 9; secondly, the lift of the centrifugal pump 9 is slowly adjusted so that the liquid level in the riser section 35 is maintained above the graduated scale 24 of the riser section 35 and no water enters the screening device 30; furthermore, the first ball valve 18 is slowly adjusted to enable all the gas in the sand adding tank 15 to be discharged, the first valve 2, the second valve 4 and the third valve 6 are sequentially opened according to whether the gas enters, the compressor 1 is rapidly opened to adjust the gas quantity, and after a period of time, stable gas quantity enters the vertical pipe section 35 through the bent pipe section 34; finally, the data acquisition card 32 and the high-speed camera 29 are turned on to begin recording the data of the second pressure transmitter 14, the third pressure transmitter 16, the fourth pressure transmitter 17, the fifth pressure transmitter 20, the sixth pressure transmitter 22 and the seventh pressure transmitter 25;
Step two: firstly, a second ball valve 27 is opened, the prepared sand suspension with a certain particle size and a certain solubility is added into a vertical pipe section 35 through a second sand adding hopper 28, then the second ball valve 27 is closed, the movement condition of sand particles in the vertical pipe section 35 is observed through a high-speed camera 29, when sand particles settle to the bottom of the vertical pipe section 35, the centrifugal pump 9 is regulated to slowly change the liquid flow, meanwhile, pressure information about sand particles in the vertical pipe section 35, acquired through a data acquisition card 32, of a fifth pressure transmitter 20, a sixth pressure transmitter 22 and a seventh pressure transmitter 25, and shot monitoring information about sand particles in the vertical pipe section 35 of the high-speed camera 29 are acquired, and the movement condition of the sand particles in the vertical pipe section is observed by referring to a scale 24 on the vertical pipe section 35, the movement speed of the sand particles can be obtained by measuring the time of the sand particles passing through different scale marks, and then whether the sand particles are balanced in the vertical pipe section 35 is judged; secondly, respectively opening the down sampling valve 21, the middle sampling valve 23 and the up sampling valve 26 on the vertical pipe section 35 to sample sand grains at different positions in the vertical pipe section 35 in a shape, and then measuring the change of the solubility of the sand grains at different positions in the vertical pipe section 35 at different times, wherein the corresponding liquid phase flow rate is the critical flow rate corresponding to the concentration of the particles with the size; finally, the pressure signal collected by the data collection card 32, the video shot by the high-speed camera 29, the measured sand movement rule and critical flow rate and the collected solubility change are recorded;
Step three: after the second step, the centrifugal pump 9 is readjusted to increase the liquid amount, the sand grains remained in the vertical pipe section 35 are carried out, then the first step is repeated, the second ball valve 27 is opened, sand grains with different particle sizes and solubilities are added into the vertical pipe section 35 through the second sand adding hopper 28 for the next group of experiments, and then the second step is repeated.
Preferably, the remaining sand carried out of the riser section 35 in step three is screened by passing through the medium outlet opening at the top of the riser section 35 to the screening device 30 on the return line, the sand being separated and the water being returned to the water storage tank 31 for recycling.
The invention provides an experimental device for sand blocking of an elbow and sand carrying of a vertical pipe in the marine oil and gas conveying process, which comprises the following specific operations of researching the sand blocking experiment of the elbow:
step one: initially, the valves of the whole experimental device are in a closed state, and the whole experimental device is filled with gas; firstly, sequentially opening a fourth valve 8, a fifth valve 10 and a sixth valve 12, and sequentially feeding water in a water storage tank 30 into a sand adding tank 15, a bent pipe section 34 and a vertical pipe section 35 through a centrifugal pump 9; secondly, the lift of the centrifugal pump 9 is slowly adjusted so that the liquid level in the riser section 35 is maintained above the graduated scale 24 of the riser section 35 and no water enters the screening device 30; further, the first ball valve 18 is slowly adjusted to enable the gas in the sand adding tank 15 to be completely discharged; finally, the data acquisition card 32 and the high-speed camera 29 are turned on, and the data of the fourth pressure transmitter 17, the fifth pressure transmitter 20, the sixth pressure transmitter 22 and the seventh pressure transmitter 25 are started to be recorded;
Step two: first, the second ball valve 27 is opened, and a certain amount of sand suspension with a certain size is added into the vertical pipe section 35 through the second sand adding hopper 28 until the bottom bent pipe section 34 of the vertical pipe section 35 is completely blocked; secondly, adjusting the centrifugal pump 9 to increase the frequency, and opening the pipeline of the bent pipe section 34 when the pressure upstream of the bent pipe section 34 reaches a certain value; thirdly, regulating the centrifugal pump 9 to continuously increase the liquid flow, observing the change of the caliber of the pipeline after stabilizing at different flow rates, and recording data; finally, the pressure information of the second pressure transmitter 14, the third pressure transmitter 16, the fourth pressure transmitter 17, the fifth pressure transmitter 20, the sixth pressure transmitter 22 and the seventh pressure transmitter 25 acquired by the data acquisition card 32 in the whole experimental process is analyzed to obtain the critical pressure difference of the pipeline opening under the working condition;
step three: changing the grain size of sand grains and the quantity of sand grains, and repeating the first step to obtain pressure difference data and change data of the caliber of a pipeline required by restarting the elbow pipe sand plug under different working conditions;
step four: after the experiment is completed, the gas-liquid flow is increased, and the rest sand grains are carried out of the bent pipe section.
The invention provides an experimental device for sand blocking of an elbow pipe and sand carrying of a vertical pipe in the marine oil and gas conveying process, which is used for researching the concrete operation of sand blocking experiments of a sand adding tank, and comprises the following steps:
Step one: initially, the valves of the whole experimental device are in a closed state; first, the first ball valve 18 is opened, and a certain amount of sand suspension with a certain size is added into the sand adding tank 15 through the first sand adding hopper 19 until an inlet pipeline of the sand adding tank 15 is blocked, wherein the position of an outlet pipe of the sand adding tank 15 is higher than that of the inlet pipe of the sand adding tank 15; secondly, sequentially opening a fourth valve 8, a fifth valve 10, a sixth valve 12, a first valve 2, a second valve 4 and a third valve 6, and regulating the gas-liquid flow to a certain value until the pipeline is opened and stabilized; furthermore, the caliber of the pipeline after the gas-liquid flow is regulated and stabilized under different working conditions is recorded; finally, the pressure information of the second pressure transmitter 14, the third pressure transmitter 16, the fourth pressure transmitter 17, the fifth pressure transmitter 20, the sixth pressure transmitter 22 and the seventh pressure transmitter 25 acquired by the data acquisition card 32 in the whole experimental process is analyzed to obtain the maximum pressure difference when the pipeline is opened;
step two: changing the grain size of sand grains and the quantity of the sand grains, and repeating the first step to obtain pressure difference data required by restarting the sand plug of the sand adding tank under different working conditions;
step three: after the experiment was completed, the stirrer 33 was turned on, the flow of the atmospheric air was turned on, and the remaining sand was removed from the sand tank.
The invention provides an experimental device for sand blocking of an elbow and sand carrying of a vertical pipe in the marine oil and gas conveying process, which is used for researching concrete operation of sand adding tank and sand blocking coupling experiment of the elbow, and comprises the following steps:
simultaneously, the sand is added to block the bend pipe section 34 and the sand adding tank 15, and the gas-liquid flow is regulated, so that pressure data when the pipeline is opened and the caliber of the pipeline is changed at different flow rates are obtained.
Preferably, the media used throughout the experiment are water, air and quartz sand.
The experimental device for sand blocking of the bent pipe and sand carrying of the vertical pipe in the marine oil and gas conveying process provided by the invention is used for researching the restarting conditions and rules of sand carrying of the vertical pipe and sand blocking of the bent pipe in the marine oil and gas conveying process, and the bent pipe section 34, the vertical pipe section 35 and the sand adding tank 15 are all transparent organic glass pipes. After the well bore is filtered, the fluid of the conveying pipeline is mainly oil, water and trace gas, wherein the fluid contains a small amount of sand grains with small particle size, and the media adopted in the experiment are water, air and quartz sand respectively. In the whole experimental system, a centrifugal pump provides water medium, a compressor provides air, and sand grains are added into an experimental device through a first sand adding funnel and a second sand adding funnel respectively. Carrying out sand carrying experiments on a vertical pipe section, wherein a graduated scale is carved on the vertical pipe section, 3 sampling valves and 3 pressure transmitters are respectively arranged on the vertical pipe section up and down, meanwhile, the motion condition of sand grains is recorded through a high-speed camera, sand grain suspension with different grain diameters and different solubilities are added into the vertical pipe section through a second sand adding funnel at the top of the vertical pipe section, and the gas-liquid flow is regulated to obtain the motion condition of the sand grains under different working conditions; and adding enough sand grains into the sand adding tank and the pipe bending section through the first sand adding hopper to respectively block the pipe bending section and the sand adding tank, and adjusting the pressure change and the pipeline caliber change when the gas-liquid flow recording pipeline is opened.
Specifically, in order to measure the movement condition of sand with different grain sizes, a test riser section is filled with liquid, a second ball valve at the top of the riser section is opened, sand solution is added into the riser section through a second sand adding hopper, when sand reaches the bottom of the riser section quickly, a centrifugal pump is opened to slowly increase the flow rate of the liquid, in the process, the movement condition of the sand in the riser section is observed by referring to a graduated scale on the riser section through a high-speed camera, the movement speed of the sand can be obtained by measuring the time of the sand passing through different graduated lines, meanwhile, the solubility change of the sand is measured through sampling ports at different positions in the riser section, the pressure signal change at different positions in the riser section is measured through pressure transmitters at different positions in the riser section, whether the sand in the riser section is in an equilibrium state is judged, and when the sand is balanced in the riser section, the corresponding liquid flow rate is recorded, and the speed is the critical flow rate of the sand with the size.
Specifically, in order to measure the sand blocking restarting conditions of the bent pipe and the sand adding tank, a sand blocking experiment is carried out at the bent pipe section at the bottom of the vertical pipe section and a sand blocking experiment is carried out at the sand adding tank at the upstream of the bent pipe section, an experimental device is filled with liquid, a second ball valve at the top of the vertical pipe section is opened, a certain amount of sand with a certain size is added into the vertical pipe through a second sand adding hopper to block the bent pipe section, the gas-liquid flow is regulated until a certain fixed value is reached, the pressure change condition of the front and the rear of the bent pipe section in the whole process is recorded through a pressure transmitter, the maximum pressure difference of the front and the rear of the bent pipe section is obtained, the experiment is repeated at a changed flow speed, and the time required for opening the pipeline under different flow speeds of sand with different particle sizes can be obtained; adding a certain amount of sand grains into the sand adding tank through the first sand adding hopper to block an inlet pipeline of the sand adding tank for sand blocking experiments of the sand adding tank, opening a centrifugal pump, adjusting the liquid flow to a certain fixed value, recording the time from the opening of the centrifugal pump to the opening of the pipeline and the caliber of the stable pipeline, recording the pressure change condition of the sand blocking sand adding tank through a pressure transmitter, obtaining the maximum value of the pressure difference, increasing the flow rate, observing the pipeline change, changing the sand size and the quantity, and repeating the experiments; adding sand into the experimental device, simultaneously blocking the bent pipe section and the sand adding tank, and repeating the steps to obtain the maximum pressure difference of the experimental device and the blocking coupling condition of the bent pipe section and the sand adding tank.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "middle", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (8)
1. The experimental device for sand blocking of the elbow and sand carrying of the vertical pipe in the marine oil and gas conveying process is characterized by comprising a vertical pipe section, a elbow section, a sand adding tank, a gas supply system, a water supply system, a data acquisition system and a sand movement monitoring system; the system comprises a vertical pipe section, a gas supply system, a water supply system, a sand adding tank, a vertical pipe section, a data acquisition system, a sand motion monitoring system and a sand motion monitoring system, wherein the vertical pipe section and the gas supply system are integrated into an L-shaped pipe section;
The air supply system comprises a compressor and an air supply pipeline, wherein the compressor is sequentially connected with a buffer tank, an air flow meter and a first pressure transmitter through the air supply pipeline;
the water supply system comprises a water storage tank and a water supply pipeline, wherein the water storage tank is sequentially connected with a centrifugal pump and a liquid flowmeter through the water supply pipeline;
the gas and liquid provided by the gas supply pipeline and the water supply pipeline are mixed through a gas-liquid mixer, a second pressure transmitter is arranged on the gas-liquid mixing pipeline, the gas-liquid mixing pipeline is connected with a sand adding tank, and the sand adding tank is sequentially connected with a bent pipe section and a vertical pipe section;
a first sand adding funnel controlled by a first ball valve is arranged above the sand adding tank, and a stirrer is arranged inside the sand adding tank;
the top of the vertical pipe section is provided with a second sand adding funnel controlled by a second ball valve, the bent pipe section and the vertical pipe section are sequentially provided with a third pressure transmitter, a fourth pressure transmitter, a fifth pressure transmitter, a sixth pressure transmitter and a seventh pressure transmitter, the fifth pressure transmitter, the sixth pressure transmitter and the seventh pressure transmitter correspond to the vertical pipe section, the vertical pipe section is sequentially provided with a down sampling valve, a middle sampling valve and an up sampling valve, and the vertical pipe section is also provided with a scale; a medium outflow port at the top of the vertical pipe section is provided with a return pipeline communicated with the water storage tank, and screening equipment is arranged on the return pipeline;
The data acquisition system comprises a data acquisition card, and the data acquisition card is respectively connected with a first pressure transmitter, a second pressure transmitter, a third pressure transmitter, a fourth pressure transmitter, a fifth pressure transmitter, a sixth pressure transmitter and a seventh pressure transmitter through lines;
the sand movement monitoring system comprises a high-speed camera, wherein the high-speed camera is used for shooting and monitoring the sand movement conditions in the bent pipe section and the vertical pipe section in the experimental process;
the method for researching the sand carrying experiment of the vertical pipe comprises the following steps:
step one: initially, the valves of the whole experimental device are in a closed state, and the whole experimental device is filled with gas; firstly, sequentially opening a fourth valve, a fifth valve and a sixth valve, and pumping water in a water storage tank into a sand adding tank, a bent pipe section and a vertical pipe section through a centrifugal pump; secondly, slowly adjusting the lift of the centrifugal pump to maintain the liquid level in the vertical pipe section above a graduated scale of the vertical pipe section and prevent water from entering the screening equipment; and then, the first ball valve is slowly regulated to enable all the gas in the sand adding tank to be discharged, the first valve, the second valve and the third valve are sequentially opened according to whether the gas enters, the compressor is rapidly opened to regulate the gas quantity, and after a period of time, stable gas quantity enters the riser section through the bent pipe section; finally, opening a data acquisition card and a high-speed camera, and beginning to record data of the second pressure transmitter, the third pressure transmitter, the fourth pressure transmitter, the fifth pressure transmitter, the sixth pressure transmitter and the seventh pressure transmitter;
Step two: firstly, a second ball valve is opened, a prepared sand suspension with a certain particle size and a certain solubility is added into a riser section through a second sand adding funnel, then the second ball valve is closed, the movement condition of sand in the riser section is observed through a high-speed camera, when sand is settled to the bottom of the riser section, a centrifugal pump is regulated to slowly change the liquid flow, meanwhile, pressure information of a fifth pressure transmitter, a sixth pressure transmitter and a seventh pressure transmitter on the riser section, acquired through a data acquisition card, shooting monitoring information of the sand condition in the riser section through the high-speed camera, and the movement condition of the sand in the riser section is observed by referring to a scale on the riser section, and the movement speed of the sand is obtained by measuring the time of the sand passing through different scale marks, so as to judge whether the sand is balanced in the riser section; secondly, respectively opening a lower sampling valve, a middle sampling valve and an upper sampling valve on the vertical pipe section to sample sand grains at different positions in the vertical pipe section, and then measuring the change of the solubility of the sand grains at different positions in the vertical pipe section, wherein the corresponding liquid phase flow rate is the critical flow rate corresponding to the size of the particles at the concentration; finally, recording the pressure signal acquired by the data acquisition card, the video shot by the high-speed camera, the measured sand movement rule and critical flow rate and the acquired solubility change;
Step three: and after the step II is finished, the centrifugal pump is readjusted to increase the liquid amount, the sand grains remained in the vertical pipe section are carried out, the step I is repeated, the second ball valve is opened, sand grains with different particle sizes and solubilities are added into the vertical pipe section through the second sand adding hopper to carry out the next experiment, and the step II is repeated.
2. The method of testing an experimental facility for pipe bending sand plugging and riser sand carrying in marine oil and gas transportation according to claim 1, wherein the residual sand carried out from the riser section in the third step is screened by a screening device on a return pipeline through a medium outlet at the top of the riser section, the sand is separated, and the water flows back to the water storage tank for recycling.
3. The experimental device for sand blocking of the elbow and sand carrying of the vertical pipe in the marine oil and gas conveying process is characterized by comprising a vertical pipe section, a elbow section, a sand adding tank, a gas supply system, a water supply system, a data acquisition system and a sand movement monitoring system; the system comprises a vertical pipe section, a gas supply system, a water supply system, a sand adding tank, a vertical pipe section, a data acquisition system, a sand motion monitoring system and a sand motion monitoring system, wherein the vertical pipe section and the gas supply system are integrated into an L-shaped pipe section;
The air supply system comprises a compressor and an air supply pipeline, wherein the compressor is sequentially connected with a buffer tank, an air flow meter and a first pressure transmitter through the air supply pipeline;
the water supply system comprises a water storage tank and a water supply pipeline, wherein the water storage tank is sequentially connected with a centrifugal pump and a liquid flowmeter through the water supply pipeline;
the gas and liquid provided by the gas supply pipeline and the water supply pipeline are mixed through a gas-liquid mixer, a second pressure transmitter is arranged on the gas-liquid mixing pipeline, the gas-liquid mixing pipeline is connected with a sand adding tank, and the sand adding tank is sequentially connected with a bent pipe section and a vertical pipe section;
a first sand adding funnel controlled by a first ball valve is arranged above the sand adding tank, and a stirrer is arranged inside the sand adding tank;
the top of the vertical pipe section is provided with a second sand adding funnel controlled by a second ball valve, the bent pipe section and the vertical pipe section are sequentially provided with a third pressure transmitter, a fourth pressure transmitter, a fifth pressure transmitter, a sixth pressure transmitter and a seventh pressure transmitter, the fifth pressure transmitter, the sixth pressure transmitter and the seventh pressure transmitter correspond to the vertical pipe section, the vertical pipe section is sequentially provided with a down sampling valve, a middle sampling valve and an up sampling valve, and the vertical pipe section is also provided with a scale; a medium outflow port at the top of the vertical pipe section is provided with a return pipeline communicated with the water storage tank, and screening equipment is arranged on the return pipeline;
The data acquisition system comprises a data acquisition card, and the data acquisition card is respectively connected with a first pressure transmitter, a second pressure transmitter, a third pressure transmitter, a fourth pressure transmitter, a fifth pressure transmitter, a sixth pressure transmitter and a seventh pressure transmitter through lines;
the sand movement monitoring system comprises a high-speed camera, wherein the high-speed camera is used for shooting and monitoring the sand movement conditions in the bent pipe section and the vertical pipe section in the experimental process;
the method for researching the sand blocking experiment of the bent pipe comprises the following steps:
step one: initially, the valves of the whole experimental device are in a closed state, and the whole experimental device is filled with gas; firstly, sequentially opening a fourth valve, a fifth valve and a sixth valve, and enabling water in a water storage tank to sequentially enter a sand adding tank, a bent pipe section and a vertical pipe section through centrifugal pumping; secondly, slowly adjusting the lift of the centrifugal pump to maintain the liquid level in the vertical pipe section above a graduated scale of the vertical pipe section and prevent water from entering the screening equipment; furthermore, the first ball valve is slowly adjusted to enable all the gas in the sand adding tank to be discharged; finally, opening a data acquisition card and a high-speed camera, and beginning to record data of the fourth pressure transmitter, the fifth pressure transmitter, the sixth pressure transmitter and the seventh pressure transmitter;
Step two: firstly, opening a second ball valve, and adding a certain amount of sand suspension with a certain size into the vertical pipe section through a second sand adding hopper until the bottom bent pipe section of the vertical pipe section is completely blocked; secondly, adjusting the increasing frequency of the centrifugal pump, and opening a pipeline of the bent pipe section when the pressure of the upstream of the bent pipe section reaches a certain value; thirdly, regulating the centrifugal pump to continuously increase the liquid flow, observing the change of the caliber of the pipeline after stabilizing at different flow rates, and recording data; finally, analyzing the pressure information of the second pressure transmitter, the third pressure transmitter, the fourth pressure transmitter, the fifth pressure transmitter, the sixth pressure transmitter and the seventh pressure transmitter acquired by the data acquisition card in the whole experimental process to obtain the critical pressure difference of the pipeline opening under the working condition;
step three: changing the grain size of sand grains and the quantity of sand grains, and repeating the first step to obtain pressure difference data and change data of the caliber of a pipeline required by restarting the elbow pipe sand plug under different working conditions;
step four: after the experiment is completed, the gas-liquid flow is increased, and the rest sand grains are carried out of the bent pipe section.
4. The experimental device for sand blocking of the elbow and sand carrying of the vertical pipe in the marine oil and gas conveying process is characterized by comprising a vertical pipe section, a elbow section, a sand adding tank, a gas supply system, a water supply system, a data acquisition system and a sand movement monitoring system; the system comprises a vertical pipe section, a gas supply system, a water supply system, a sand adding tank, a vertical pipe section, a data acquisition system, a sand motion monitoring system and a sand motion monitoring system, wherein the vertical pipe section and the gas supply system are integrated into an L-shaped pipe section;
The air supply system comprises a compressor and an air supply pipeline, wherein the compressor is sequentially connected with a buffer tank, an air flow meter and a first pressure transmitter through the air supply pipeline;
the water supply system comprises a water storage tank and a water supply pipeline, wherein the water storage tank is sequentially connected with a centrifugal pump and a liquid flowmeter through the water supply pipeline;
the gas and liquid provided by the gas supply pipeline and the water supply pipeline are mixed through a gas-liquid mixer, a second pressure transmitter is arranged on the gas-liquid mixing pipeline, the gas-liquid mixing pipeline is connected with a sand adding tank, and the sand adding tank is sequentially connected with a bent pipe section and a vertical pipe section;
a first sand adding funnel controlled by a first ball valve is arranged above the sand adding tank, and a stirrer is arranged inside the sand adding tank;
the top of the vertical pipe section is provided with a second sand adding funnel controlled by a second ball valve, the bent pipe section and the vertical pipe section are sequentially provided with a third pressure transmitter, a fourth pressure transmitter, a fifth pressure transmitter, a sixth pressure transmitter and a seventh pressure transmitter, the fifth pressure transmitter, the sixth pressure transmitter and the seventh pressure transmitter correspond to the vertical pipe section, the vertical pipe section is sequentially provided with a down sampling valve, a middle sampling valve and an up sampling valve, and the vertical pipe section is also provided with a scale; a medium outflow port at the top of the vertical pipe section is provided with a return pipeline communicated with the water storage tank, and screening equipment is arranged on the return pipeline;
The data acquisition system comprises a data acquisition card, and the data acquisition card is respectively connected with a first pressure transmitter, a second pressure transmitter, a third pressure transmitter, a fourth pressure transmitter, a fifth pressure transmitter, a sixth pressure transmitter and a seventh pressure transmitter through lines;
the sand movement monitoring system comprises a high-speed camera, wherein the high-speed camera is used for shooting and monitoring the sand movement conditions in the bent pipe section and the vertical pipe section in the experimental process;
the method for researching sand blocking experiment of the sand adding tank comprises the following steps:
step one: initially, the valves of the whole experimental device are in a closed state; firstly, opening a first ball valve, and adding a certain amount of sand grain suspension with a certain size into a sand adding tank through a first sand adding hopper until an inlet pipeline of the sand adding tank is blocked; secondly, sequentially opening a fourth valve, a fifth valve, a sixth valve, a first valve, a second valve and a third valve, and regulating the gas-liquid flow to a certain value until the pipeline is opened and stabilized; furthermore, the caliber of the pipeline after the gas-liquid flow is regulated and stabilized under different working conditions is recorded; finally, analyzing the pressure information of the second pressure transmitter, the third pressure transmitter, the fourth pressure transmitter, the fifth pressure transmitter, the sixth pressure transmitter and the seventh pressure transmitter acquired by the data acquisition card in the whole experimental process to obtain the maximum pressure difference when the pipeline is opened;
Step two: changing the grain size of sand grains and the quantity of the sand grains, and repeating the first step to obtain pressure difference data required by restarting the sand plug of the sand adding tank under different working conditions;
step three: after the experiment is finished, the stirrer is opened, the air flow is opened, and the residual sand grains are removed from the sand adding tank.
5. The experimental device for sand blocking of the elbow and sand carrying of the vertical pipe in the marine oil and gas conveying process is characterized by comprising a vertical pipe section, a elbow section, a sand adding tank, a gas supply system, a water supply system, a data acquisition system and a sand movement monitoring system; the system comprises a vertical pipe section, a gas supply system, a water supply system, a sand adding tank, a vertical pipe section, a data acquisition system, a sand motion monitoring system and a sand motion monitoring system, wherein the vertical pipe section and the gas supply system are integrated into an L-shaped pipe section;
The air supply system comprises a compressor and an air supply pipeline, wherein the compressor is sequentially connected with a buffer tank, an air flow meter and a first pressure transmitter through the air supply pipeline;
the water supply system comprises a water storage tank and a water supply pipeline, wherein the water storage tank is sequentially connected with a centrifugal pump and a liquid flowmeter through the water supply pipeline;
the gas and liquid provided by the gas supply pipeline and the water supply pipeline are mixed through a gas-liquid mixer, a second pressure transmitter is arranged on the gas-liquid mixing pipeline, the gas-liquid mixing pipeline is connected with a sand adding tank, and the sand adding tank is sequentially connected with a bent pipe section and a vertical pipe section;
a first sand adding funnel controlled by a first ball valve is arranged above the sand adding tank, and a stirrer is arranged inside the sand adding tank;
the top of the vertical pipe section is provided with a second sand adding funnel controlled by a second ball valve, the bent pipe section and the vertical pipe section are sequentially provided with a third pressure transmitter, a fourth pressure transmitter, a fifth pressure transmitter, a sixth pressure transmitter and a seventh pressure transmitter, the fifth pressure transmitter, the sixth pressure transmitter and the seventh pressure transmitter correspond to the vertical pipe section, the vertical pipe section is sequentially provided with a down sampling valve, a middle sampling valve and an up sampling valve, and the vertical pipe section is also provided with a scale; a medium outflow port at the top of the vertical pipe section is provided with a return pipeline communicated with the water storage tank, and screening equipment is arranged on the return pipeline;
The data acquisition system comprises a data acquisition card, and the data acquisition card is respectively connected with a first pressure transmitter, a second pressure transmitter, a third pressure transmitter, a fourth pressure transmitter, a fifth pressure transmitter, a sixth pressure transmitter and a seventh pressure transmitter through lines;
the sand movement monitoring system comprises a high-speed camera, wherein the high-speed camera is used for shooting and monitoring the sand movement conditions in the bent pipe section and the vertical pipe section in the experimental process;
the method for researching sand blocking experiments of the sand adding tank and the bent pipe comprises the following steps:
meanwhile, the sand is added to block the bent pipe section and the sand adding tank, and the gas-liquid flow is regulated to obtain pressure data when the pipeline is opened and the caliber of the pipeline is changed at different flow rates.
6. The method of testing an experimental facility for sand plugging of elbows and sand carrying of risers during marine oil and gas transfer according to any of claims 1-5, wherein the media used throughout the experiment are water, air and silica sand.
7. The method for testing the experimental device for sand plugging of the elbow pipe and sand carrying of the vertical pipe in the marine oil and gas conveying process according to any one of claims 1 to 5, wherein a first valve is arranged on a pipeline between the compressor and the buffer tank, a second valve is arranged on a pipeline between the buffer tank and the gas flowmeter, and a third valve is arranged on a pipeline between the first pressure transmitter and the gas-liquid mixer; and a fourth valve is arranged on a pipeline between the water storage tank and the centrifugal pump, a fifth valve is arranged on a pipeline between the centrifugal pump and the liquid flowmeter, and a sixth valve is arranged on a pipeline between the liquid flowmeter and the gas-liquid mixer.
8. The experimental device and method for experimental device of sand plugging of bend pipe and sand carrying of vertical pipe in marine oil and gas transportation process according to any one of claims 1-5, wherein transparent organic glass pipe is adopted for the bend pipe section, the vertical pipe section and the sand adding tank.
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| CN114459783A (en) * | 2020-11-09 | 2022-05-10 | 中国石油天然气股份有限公司 | Online testing device and method for desander |
| CN112986037B (en) | 2021-05-20 | 2021-07-27 | 西南石油大学 | Experimental device for simulating stratum sand production and eroding oil pipe column |
| CN113624765A (en) * | 2021-07-08 | 2021-11-09 | 北京科技大学 | Visual monitoring experiment device for filling slurry pipeline transportation and use method |
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