CN101699264B - Testing device and testing method for emission reduction of maintenance liquid in pipeline - Google Patents
Testing device and testing method for emission reduction of maintenance liquid in pipeline Download PDFInfo
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- CN101699264B CN101699264B CN2009102185020A CN200910218502A CN101699264B CN 101699264 B CN101699264 B CN 101699264B CN 2009102185020 A CN2009102185020 A CN 2009102185020A CN 200910218502 A CN200910218502 A CN 200910218502A CN 101699264 B CN101699264 B CN 101699264B
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Abstract
The invention discloses a testing device and a testing method for pollution reduction of maintenance liquid in pipeline for the purpose of testing the pollution reduction performance of drag reduction agent to the maintenance liquid or dropsy in gas pipeline. A zero net-liquid gas-liquid two-phase flow is used as an experimental physical model of the maintenance liquid in gas pipeline; a critical inclination is used as the smallest inclination of the maintenance liquid or dropsy in gas pipeline and a vertical ascent pipe is used as the pipe with the biggest inclination. The pollution reduction rate of the maintenance liquid in the vertical pipeline and the tipping tube with an inclination as the critical inclination is used as the base data of the pollution reduction effect to the maintenance liquid of drag reduction agent. The performing method is to measure the liquid content remaining in a measuring section by a testing device which comprises a vertical pipeline and a tipping tube to acquire the rate of liquid maintenance in pipeline. The pollution reduction rate of the maintenance liquid is acquired by comparing the relative change rate of the maintenance liquid before and after adding the drag reduction agent.
Description
Technical field
The present invention relates to a kind of proving installation and method of testing of pollution reduction of maintenance liquid in pipeline, especially at natural gas line or other gas pipeline under the gas-liquid two-phase stream mode, be used to test the reduction performance of drag reducer to maintenance liquid in pipeline or hydrops.
Background technology
The polyphasic flow drag reduction technology is not only to reduce the flowage friction resistance, and under some flow operating modes, the main target of polyphasic flow drag reduction is to reduce the maintenance liquid in pipeline rate.
In gas production and induction system, to hold liquid and be the liquid that accumulates in the vial and can not discharge and the phenomenon that accumulate at the pipeline regional area constantly with air-flow, this phenomenon is also referred to as hydrops.Hold a kind of often special local phenomenon of liquid phenomenon in the gas pipeline, the flow state of holding the liquid zone this moment is higher biphase gas and liquid flow slug flow of liquid holdup or block stream, then is the low-down air-flow of liquid content but not hold the liquid zone.Hold the liquid phenomenon when taking place, to hold liquid holdup in the liquid zone air-flow big one even more than the several magnitude than non-to hold the two-phase flow liquid holdup in territory, liquid zone.
Gas pipeline is held the liquid serious situation and can be taken place in vertical tube and some tipping tubes, for example, at the high spud angle rising pipeline section of rock gas well casing, conveyance conduit and the rising pipeline section of tubular type gas-liquid separator, can there be mobile this special flow phenomenon of zero clean flow quantity gas-liquid two-phase, showing as a certain section at well casing or pipeline has and significantly holds liquid, the liquid holdup in this section biphase gas and liquid flow district is than higher, and the liquid holdup of pipeline import and export place air-flow is very little even be zero.This phenomenon can have a strong impact on the production efficiency of rock gas if betide in the gasser; If betide in the gas side pipe road of separation vessel, then can increase the local flow resistance, worsen the performance of separation vessel; If betide in the conveyance conduit of rock gas, then can increase channel flow dynamic resistance and energy dissipation, reduce the pipeline transport power.Liquid may cause by multiple factor, may be the output liquid of gas well, the condensation water that causes by the variation of temperature or pressure, hydraulic test of pipeline residuary water, accident occur by natural gas line upstream process equipment and bring liquid in the pipeline into, or the like.In the production and course of conveying of rock gas, no matter be that dry gas is carried or moisture is carried, the ducted liquid of holding not only can reduce pipeline operation efficiency, still causes the reason of pipeline corrosion simultaneously.How the liquid of holding in the gas pipeline is reduced discharging, also therefore become the major issue that the polyphasic flow drag reduction technology will solve.
Drag reducer can be divided into two big classes, and a class is a polymer drag reducer, and it mainly acts on is to reduce frictional resistance; One class is a surfactant, and it mainly acts on is to reduce surface tension, in the time of on concentration reaches critical micelle concentration, also is used to reduce frictional resistance.Some drag reducers, for example some foaming kind surfactants can make air-flow take the increase of liquid rate by producing foam, reach the purpose of discharge opeing, and this technology is exactly a foam discharge opeing technology.Foam discharge opeing technology adopts the foam carrier rate to characterize the effect of foam discharge opeing usually.Foam discharge opeing theory it is generally acknowledged that if the generation rate of the liquid rate of taking greater than liquid of foam, the rock gas well casing just can avoid holding liquid.Though this understanding has certain foundation, some nonlinear factors have been ignored.To studies show that of natural gas line polyphasic flow drag reduction mechanism, take liquid rate or foam carrier rate in the initial a period of time greater than the liquid generation rate at air-flow, the content of liquid can reduce gradually because of the foam discharge opeing really in the pipeline.But, air-flow take the liquid rate or the foam carrier rate relevant with ducted content liquid.Along with reducing of content liquid in the pipeline, foam and liquid carry over thereof also reduce thereupon even are zero, and this moment ducted content liquid and non-vanishing, but be in a new equilibrium point with parameters such as drag reducer concentration, gas flow rates, this equilibrium point will be corresponding to a new liquid status of holding.The foam carrier rate just reflects the parameter of foam carrier ability, can not reflect the real content of liquid in the pipeline.Therefore, the size by test foam carrier rate perhaps by testing conduit exit lifting rate what, all can not accurately characterize and hold the really degree that liquid is lowered in the pipe.
Summary of the invention
The present invention is directed to existing air-flow and take the limitation of liquid rate method of testing, proposes a kind ofly to take the apparatus and method that the liquid rate is tested, can reflect more reasonably that drag reducer is to holding the emission reduction effect of liquid in managing with pollution reduction of maintenance liquid rate test replacement air-flow.Apparatus of the present invention can be used for testing the reduction performance that drag reducer is held liquid or hydrops to gas pipeline, thereby can be preferably, recommend the agent of natural gas line pollution reduction of maintenance liquid.
For reaching above purpose, the present invention takes following technical scheme to be achieved:
A kind of proving installation of pollution reduction of maintenance liquid in pipeline, it is characterized in that, comprise vertical tube and tipping tube, the outlet of vertical tube connects a storage liquid container of depositing drag reducer by gas-liquid separator, the import of vertical tube connects the outlet of tipping tube by flexible pipe, the import of tipping tube connects liquid charge pump and gas flow control device by flexible pipe, and described liquid charge pump is connected with the storage liquid container, and described gas flow control device is connected with source of the gas by a gas meter; The import of tipping tube is provided with temperature sensor; Be respectively equipped with two ends in described vertical tube and the tipping tube and have test section into and out of retaining valve, described vertical tube test section, tipping tube test section are respectively equipped with fluid level transmitter that can produce differential pressure signal and the pressure unit that can produce pressure signal, and wherein the tipping tube test section also is provided with the inclination angle adjustor of adjustable tilt section inclination angle size.
In the such scheme, be respectively equipped with the liquid level rule in described vertical tube test section, the tipping tube test section.
Described gas flow control device comprises a gas circuit variable valve and a retaining valve.
Described gas meter comprises an aperture plate flowmeter and a big orifice flowmeter parallel with one another, and its flow size is by the control of gas circuit variable valve, and class of accuracy is 1.0.
Described fluid level transmitter is a Rosemount high precision differential pressure transmitter, and differential pressure range is adjustable continuously in 1kPa to 100kPa scope, and class of accuracy is 0.25.
Described tilting section inclination angle adjustable size adjusting range is 0～20 °.
A kind of method of testing of the pollution reduction of maintenance liquid in pipeline based on above device comprises the steps:
(1) in the storage liquid container, adds the liquid that does not contain drag reducer;
(2) open liquid charge pump liquid is injected into tipping tube test section and vertical tube test section, close liquid charge pump after making the test section full of liquid, open source of the gas by gas flow control device and make test section form zero clean flow quantity biphase gas and liquid flow;
(3) the maintenance gas flow is stabilized in a certain value between the 0.8-8m/s, pass through inclination angle adjustor, change the inclination angle of tipping tube test section gradually, 0.5 ° of each change, liquid in tipping tube can all be discharged by air-flow, with this 0.5 ° of angle readjustment and fixing, this angle is exactly a pairing critical dip under this specific gas flow;
(4) repeating step (2) makes to form zero clean flow quantity biphase gas and liquid flow in the test section, and keeps 10-20min, then close source of the gas by gas flow control device, after air-flow stopped, the liquid in tipping tube test section and the vertical tube test section was formed hydrostatic column by unidirectional valve closure in test section
Liquid holdup H when (5) measuring no drag reducer by separately fluid level transmitter in tipping tube, the vertical tube test section
L0
(6) by gas flow control device all liquid is blown out test section, liquid flows back to the storage liquid container by gas-liquid separator; Drag reducer is added the storage liquid container, make solution contain drag reducer;
(7) repeating step (2)～(4) are having under the drag reducer condition, liquid holdup H when obtaining tipping tube and vertical tube and drag reducer being arranged in the test section separately
Ln
(8) by formula:
Calculate pollution reduction of maintenance liquid rate R
Δ H,
H wherein
L0Pairing liquid holdup when being 0ppm for the drag reducer volumetric concentration, H
LnLiquid holdup when being n ppm (n is a natural number) for the drag reducer volumetric concentration.
The present invention is with " zero clean flow quantity biphase gas and liquid flow " the experimental physics model when holding liquid as gas pipeline, and this model all is set at zero with the import and export fluid flow in pipeline gas/liquid two-phase flow district, does not also consider the phase transformation of two-phase region.When liquid content in the air-flow is very low, the flow state when this physical model can the feasible simulation gas pipeline be held liquid.Since be " zero clean flow quantity biphase gas and liquid flow ", accident quantity of fluid flow of the present invention, a measurement gas flow.
Description of drawings
The present invention is described in further detail below in conjunction with the drawings and the specific embodiments.
Fig. 1 is a proving installation structural drawing of the present invention.Among the figure:
1-tipping tube test section 2-vertical tube test section
3-gas-liquid separator 4-stores liquid container
5-stirrer 6-liquid charge pump
7-inclination angle adjustor 8-gas aperture plate flowmeter
The big orifice flowmeter 10-of 9-gas gas circuit variable valve
11-gas circuit retaining valve 12-tipping tube import metal hose
13-tipping tube import retaining valve 14-tipping tube liquid level rule
15-tipping tube outlet retaining valve 16-tipping tube outlet metal hose
17-vertical tube import retaining valve 18-vertical tube liquid level rule
19-vertical tube outlet retaining valve 20-source of the gas
The big orifice plate valve downstream of 21-gas aperture plate valve downstream 22-gas
Valve 24-lyophoby valve before the 23-pump
25-liquid-filling valve 26-tipping tube fluid level transmitter
27-tipping tube pressure unit 28-vertical tube fluid level transmitter
29-vertical tube pressure unit 30-thermopair
Fig. 2 is concrete test result of the present invention.
Embodiment
Technical scheme of the present invention is the data that obtain the pollution reduction of maintenance liquid rate by the measurement to pipeline average external volume liquid holdup, and the ultimate principle of institute's foundation is:
The average external volume liquid holdup is a term of biphase gas and liquid flow, is meant that the volume of liquid in pipe accounts for the ratio of cumulative volume in the pipe.A certain position in the natural gas line is if liquid, and then this position is exactly the gas-liquid two-phase state that flows.If the average external volume liquid holdup is greater than liquid volume flow shared share in the gas-liquid two-phase total volumetric flow rate, this situation just is called in polyphasic flow holds liquid, and correspondingly, ducted average external volume liquid holdup is also referred to as liquid holdup.Holding the liquid phenomenon is that promptly the true mean flow rate of gas is greater than the true mean flow rate of liquid because exist due to the velocity-slip between gas-liquid two-phase.Liquid holdup is liquid accumulates degree in pipeline true reflection, and the pollution reduction of maintenance liquid rate is exactly the relative change rate of liquid holdup.Pollution reduction of maintenance liquid rate R
Δ HBe defined as:
R wherein
Δ HBe pollution reduction of maintenance liquid rate, H
L0Pairing liquid holdup when being 0ppm for the drag reducer volumetric concentration, H
LnLiquid holdup when being n ppm (n is a natural number) for the drag reducer volumetric concentration.Test pollution reduction of maintenance liquid rate just can truly reflect accumulating the reduction of discharging degree of liquid in the pipeline.
Judge that it is the critical dip of pipeline that gas pipeline is held the important evidence of liquid.In certain flow parameter scope, the inclination angle of gas pipeline is greater than critical dip, and this section of tubing just can be held liquid, otherwise the liquid that occurs in the pipeline can be discharged with air-flow.Usually the pipeline inclination angle is big more, and holding liquid will be serious more, and therefore, the pairing liquid holdup of critical dip is the lower limit that gas pipeline is seriously held liquid.The pipeline inclination angle is 90 ° to the maximum, and pairing pipeline form is a upward vertical tube, and therefore, the pairing liquid holdup of vertical tube is the upper limit that gas pipeline is seriously held liquid.The present invention is directed to vertical tube and inclination angle is these two kinds of pipeline forms of tipping tube of critical dip, tests its pollution reduction of maintenance liquid rate respectively, with the pollution reduction of maintenance liquid rate of these two kinds of pipeline forms as characterizing the basic data of drag reducer to the pollution reduction of maintenance liquid in pipeline effect.
Fig. 1 is an example structure of proving installation of the present invention, comprise: tipping tube test section 1, vertical tube test section 2, gas-liquid separator 3, storage liquid container 4, stirrer 5, liquid charge pump 6, gas orifice flowmeter 8 and 9, gas control valve 10, gas circuit retaining valve 11 etc., the tipping tube test section comprises: inclination angle adjustor 7 grades, tipping tube import retaining valve 13, tipping tube liquid level rule, tipping tube outlet retaining valve 15, tipping tube fluid level transmitter 26, tipping tube pressure unit 27.The vertical tube test section comprises: vertical tube import retaining valve 17, vertical tube liquid level rule 18, vertical tube outlet retaining valve 19, vertical tube fluid level transmitter 28 and vertical tube pressure unit 29.2 meters of vertical tube and inclination pipe ranges, caliber is identical, and is variable in 20mm to 60mm scope, if no special instructions or requirement, usually internal diameter of the pipeline is chosen to be 40mm.The gas velocity of test section can reach 50m/s, and the maximum working pressure (MWP) of test section is 0.5MPa.
The principle of work of this device is: drag reducer adds storage liquid container 4 by stirrer 5, formation contains the liquid of finite concentration drag reducer, earlier liquid is poured into tipping tube test section 1 and vertical tube test section 2 by liquid charge pump 6, then open gas circuit variable valve 10 gradually, partially liq is brought gas-liquid separator into by air-flow, liquid recycles, and the gas emptying accumulates to be in the liquid of test section and holds liquid.
Gas inserts gas pipeline by source of the gas 20, at the size of flow, can select gas aperture plate flowmeter 8 and gas macropore plate flowmeter 9 for use, and its flow size is by 10 controls of gas circuit variable valve.Gas aperture plate flowmeter 8 and gas macropore plate flowmeter 9 all are the combinations of orifice plate and Rosemount high precision differential pressure transmitter, pressure unit and thermopair, change the flow signal of gas into electric signal, externally export the mass rate of gas.
The coefficient of flow of orifice plate is through calibrating, and the orifice flowmeter class of accuracy is 1.0.The pressure of tipping tube can be measured by pressure unit 27, the pressure of vertical tube can be measured by pressure unit 29, the temperature of two-phase flow is measured by thermopair 30, test process can be regarded isothermal process as, record temperature and pressure data, gas density can be calculated by state equation, and the mass rate that records in conjunction with caliber and orifice flowmeter again can calculate the gas flow rate at tipping tube and vertical tube place.Gas circuit is installed retaining valve 11, can avoid liquid to enter gas path pipe.
The inclination angle size of tilting section is by inclination angle adjustor 7 controls, and the tilt adjustable adjusting range is 0～20 °.The import and export of tilting section link to each other with metal hose 16 with metal hose 12 respectively, use metal hose can make the adjusting at inclination angle more easy to operate.Can change pipe angle and determine critical dip by inclination angle adjustor 7.
The import and export design and installation of tipping tube test section 1 retaining valve 13 and retaining valve 15, the import and export design and installation of vertical tube test section 2 retaining valve 17 and retaining valve 19.Close after the gas circuit variable valve, retaining valve can be closed in the liquid that accumulates and form static fluid column in the test section, can obtain the maintenance liquid in pipeline rate by measuring the volume ratio of hydrostatic column in test section.Because test section is the pipeline of uniform cross-section, therefore, liquid shared length in test section is exactly liquid holdup divided by the test section total length.Liquid shared length in tipping tube test section and vertical tube test section is measured by liquid level rule 14 and liquid level rule 18 respectively.Liquid level is relevant with static pressure reduction, and therefore, the liquid holdup of tipping tube test section can be measured by tipping tube fluid level transmitter 26, and the liquid holdup of vertical tube test section can be measured by vertical tube fluid level transmitter 28.This installs employed fluid level transmitter is Rosemount high precision differential pressure transmitter, and differential pressure range is adjustable continuously in 1kPa to 100kPa scope, and class of accuracy is 0.25.The voltage signal of differential pressure, temperature and pressure all can insert data acquisition system (DAS) by transmitter.
The method of testing that the present invention is based on the pollution reduction of maintenance liquid in pipeline of Fig. 1 device comprises the steps: the debugging of zero clean flow quantity biphase gas and liquid flow.With the tilt adjustment of tipping tube is critical dip.Vertical tube and tipping tube liquid holdup H during with drag reducer
L0Test.With test vertical tube and tipping tube liquid holdup H after the drag reducer
LnCalculate pollution reduction of maintenance liquid rate R
Δ H
Specific as follows:
(1) debugging of zero clean flow quantity biphase gas and liquid flow.Close preceding valve 23 of pump and lyophoby valve 24, the liquid that does not contain drag reducer is joined the storage liquid container to certain liquid level.Open valve 23 and liquid-filling valve 25 before the pump, open liquid charge pump 6, liquid is injected into tipping tube test section 1 and vertical tube test section 2, close liquid charge pump 6 and liquid-filling valve 25 after making the test section full of liquid.Open source of the gas 20, gas aperture plate valve downstream 21, open gas circuit variable valve 10 gradually, make and form zero clean flow quantity biphase gas and liquid flow in the test section.
(2) critical dip determines.Keep gas flow to be stabilized in a certain value, use 0.5 ° of inclination angle adjustor 7 each change, change the inclination angle of tipping tube test section gradually, the liquid in tipping tube can all be discharged by air-flow.With this 0.5 ° of angle readjustment and fixing, this new angle is exactly the pairing critical dip of this flow operating mode.Normally earlier bigger value is adjusted at the inclination angle before the test, reduced the inclination angle then gradually until the little critical dip that arrives.
(3) the liquid holdup test during no drag reducer.Repeating step (1) makes in the test section to form zero clean flow quantity biphase gas and liquid flow and keep stablizing 10-20min, then closes gas circuit variable valve 10 gradually.After air-flow stopped, the liquid in the tipping tube test section was closed in test section and forms hydrostatic column by retaining valve 13 and retaining valve 15, measures liquid holdup by liquid level rule 14 or fluid level transmitter 26.Liquid in the vertical tube test section is closed in test section and forms hydrostatic column by retaining valve 17 and retaining valve 19, measures liquid holdup by liquid level rule 18 or fluid level transmitter 28.
(4) repeating step (1)～(3) obtain critical dip and the corresponding liquid holdup of tipping tube at the gas with various flow velocity, obtain the liquid holdup of vertical tube at the gas with various flow velocity.Then open the atmospheric flow velocity, all liquid is blown out test section, liquid flows back to the storage liquid container by gas-liquid separator.
(5) drag reducer is added the storage liquid container, be mixed in the liquid by stirrer 5, proportioning obtains the solution of certain drag reducer concentration.
Liquid holdup test when (6) drag reducer being arranged.Repeating step (1)～(3) are having under the drag reducer condition, obtain critical dip and the corresponding liquid holdup of tipping tube at the gas with various flow velocity, obtain the liquid holdup of vertical tube at the gas with various flow velocity.
(7) according to formula
Calculate the pollution reduction of maintenance liquid rate, finish gas pipeline pollution reduction of maintenance liquid test process, can draw vertical tube and tipping tube pollution reduction of maintenance liquid rate curve figure at last.
Fig. 2 is a test result example.According to Fig. 2, for diameter is the gas pipeline that 40mm, gas flow rate move in 0.8～6.7m/s scope, adopt HY type drag reducer to wherein hold liquid or hydrops reduces discharging, when the volumetric concentration of drag reducer was 400ppm, the scope of pollution reduction of maintenance liquid rate was limited by two curves among Fig. 2.The pairing curve of tipping tube is the lower limit of pollution reduction of maintenance liquid rate, and minimum pollution reduction of maintenance liquid rate is 6%; The pairing curve of vertical tube is the higher limit of pollution reduction of maintenance liquid rate, and maximum pollution reduction of maintenance liquid rate is 38%.According to the result of Fig. 2,, can determine whether HY type drag reducer can be used as the technical scheme of gas pipeline pollution reduction of maintenance liquid when volumetric concentration is 400ppm in conjunction with concrete pollution reduction of maintenance liquid requirement.
Claims (7)
1. the proving installation of a pollution reduction of maintenance liquid in pipeline, it is characterized in that, comprise vertical tube and tipping tube, the outlet of vertical tube connects a storage liquid container of depositing drag reducer by gas-liquid separator, the import of vertical tube connects the outlet of tipping tube by flexible pipe, the import of tipping tube connects liquid charge pump and gas flow control device by flexible pipe, and described liquid charge pump is connected with the storage liquid container, and described gas flow control device is connected with source of the gas by a gas meter; The import of tipping tube is provided with temperature sensor; Be respectively equipped with two ends in described vertical tube and the tipping tube and have test section into and out of retaining valve, described vertical tube test section, tipping tube test section are equipped with fluid level transmitter and pressure unit, and wherein the tipping tube test section also is provided with the inclination angle adjustor of regulating the tilting section inclination angle.
2. the proving installation of pollution reduction of maintenance liquid in pipeline as claimed in claim 1 is characterized in that, is respectively equipped with the liquid level rule in described vertical tube test section, the tipping tube test section.
3. the proving installation of pollution reduction of maintenance liquid in pipeline as claimed in claim 1 is characterized in that, described gas flow control device comprises a gas circuit variable valve and a retaining valve.
4. the proving installation of pollution reduction of maintenance liquid in pipeline as claimed in claim 1 is characterized in that, described gas meter comprises an aperture plate flowmeter and a big orifice flowmeter parallel with one another, and class of accuracy is 1.0.
5. the proving installation of pollution reduction of maintenance liquid in pipeline as claimed in claim 1 is characterized in that, the differential pressure range of described fluid level transmitter is adjustable continuously in 1kPa to 100kPa scope, and class of accuracy is 0.25.
6. the proving installation of pollution reduction of maintenance liquid in pipeline as claimed in claim 1 is characterized in that, described tilting section inclination angle adjustable size adjusting range is 0～20 °.
7. the method for testing of a pollution reduction of maintenance liquid in pipeline, the device based on claim 1 is characterized in that, comprises the steps:
(1) in the storage liquid container, adds the liquid that does not contain drag reducer;
(2) open liquid charge pump liquid is injected into tipping tube test section and vertical tube test section, close liquid charge pump after making the test section full of liquid, open source of the gas by gas flow control device and make test section form zero clean flow quantity biphase gas and liquid flow;
(3) the maintenance gas flow is stabilized in the arbitrary value between the 0.8-8m/s, pass through inclination angle adjustor, change the inclination angle of tipping tube test section gradually, 0.5 ° of each change, liquid in tipping tube can all be discharged by air-flow, with this 0.5 ° of angle readjustment and fixing, this angle is exactly a pairing critical dip under this specific gas flow;
(4) repeating step (2), make and form zero clean flow quantity biphase gas and liquid flow in the test section, and 10-20min is stablized in maintenance, then close source of the gas by gas flow control device, after air-flow stops, liquid in tipping tube test section and the vertical tube test section is formed hydrostatic column by unidirectional valve closure in test section
When (5) measuring no drag reducer by separately fluid level transmitter in tipping tube, the vertical tube test section, promptly the drag reducer volumetric concentration is the liquid holdup H of 0ppm
L0
(6) by gas flow control device all liquid is blown out test section, liquid flows back to the storage liquid container by gas-liquid separator; Drag reducer is added the storage liquid container, make solution contain drag reducer;
(7) repeating step (2)～(4), when by separately fluid level transmitter measurement in tipping tube, the vertical tube test section drag reducer being arranged, promptly the drag reducer volumetric concentration is the liquid holdup H of nppm
Ln
(8) by formula:
Calculate pollution reduction of maintenance liquid rate R
Δ H, H wherein
L0Pairing liquid holdup when being 0ppm for the drag reducer volumetric concentration, H
LnLiquid holdup when being n ppm for the drag reducer volumetric concentration.
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| CN109816133B (en) * | 2017-11-21 | 2021-07-30 | 中国石油天然气股份有限公司 | Method for predicting corrosion in pipeline |
| CN108225729B (en) * | 2018-03-29 | 2023-11-14 | 榆林学院 | Accurate regulation gas-liquid two-phase flow experiment table |
| CN108267381B (en) * | 2018-04-24 | 2024-01-26 | 西南石油大学 | Comprehensive experiment device for gas-liquid-solid multiphase flow erosion and corrosion |
| CN110763265B (en) * | 2018-07-25 | 2021-08-31 | 中国石油化工股份有限公司 | System and method for testing atomization spraying effect of natural gas drag reducer |
| CN109900590B (en) * | 2019-03-29 | 2020-04-28 | 西安交通大学 | Method for measuring liquid holdup of gas-liquid two-phase flow pipeline |
| CN111220501B (en) * | 2019-12-04 | 2022-04-29 | 西南石油大学 | On-line evaluation method for drag reducer drag reduction effect in oil pipeline |
| CN111852446A (en) * | 2020-07-23 | 2020-10-30 | 中国海洋石油集团有限公司 | Physical simulation experiment device for gas well accumulated liquid |
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