CN104502231B - Double capillary viscometer for high temperature and high pressure and test method thereof - Google Patents
Double capillary viscometer for high temperature and high pressure and test method thereof Download PDFInfo
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- CN104502231B CN104502231B CN201410805224.XA CN201410805224A CN104502231B CN 104502231 B CN104502231 B CN 104502231B CN 201410805224 A CN201410805224 A CN 201410805224A CN 104502231 B CN104502231 B CN 104502231B
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Abstract
The invention discloses a double capillary viscometer for high temperature and high pressure and a test method thereof. The viscometer comprises a constant flow pump, a double capillary pipeline, a constant temperature system, a data signal measurement and acquisition system and a back pressure valve. The test method comprises the following steps: connecting double capillaries of the same size in series in a constant temperature environment at the temperature T0, allowing standard fluid to sequentially flow through the double capillaries according to a certain volume flow rate, and measuring the pressure drop of the pipeline; respectively arranging the double capillaries in the constant temperature environments at the temperatures T0 and T, and measuring the pressure drop of the standard fluid flowing through the double capillaries; arranging the double capillaries in the constant temperature environment at the temperature T0, measuring the pressure drop of the measured fluid of the same volume flow rate flowing through the double capillaries, respectively arranging the double capillaries in the constant temperature environments at the temperatures T0 and T, measuring the pressure drop of the standard fluid flowing through the double capillaries, and finally calculating the viscosity. According to the double capillary viscometer disclosed by the invention, the test method is simple, the measurement accuracy is high, and online measurement of dynamic viscosity of the fluid under high temperature and high pressure conditions can be realized.
Description
Technical field
Fluid viscosity field of measuring technique of the present invention, and in particular to a kind of double capillary viscometer for High Temperature High Pressure and
Its method of testing.
Background technology
Viscosity is one of important physical property of fluid, is the physical quantity for characterizing fluid viscosity degree.Viscosity measurement
Play an important role in the fields such as oil, chemical industry, traffic, metallurgy, medicine, food, building materials and national defence.At present viscosity is surveyed
Amount method mainly includes capillary tube method, Constructional Elements Using Falling Methods, circumgyration, vibratory drilling method and supercritical ultrasonics technology etc..
The principle of circumgyration is to act on the viscosity torque of object or the rotating speed of object to determine fluid by measurement fluid
Viscosity.Due to the advantage that it can measure same material under different shear rates, it is widely used in measuring cattle
The viscosity and rheological behavior of liquid and non-newtonian liquid.Hardware device needed for having the disadvantage is more, and complex structure, price is relatively held high
It is expensive.
The principle of Constructional Elements Using Falling Methods is to fall suffered resistance in a liquid to determining the viscosity of fluid using object.Feature is
Simple structure, can conveniently carry out the measurement of high viscosity fluid viscosity.Have the disadvantage to be only suitable for measuring the larger cattle of density ratio
Pause fluid；During measurement opaque liquid viscosity, the induction installation for using characteristic is needed.
Vibratory drilling method mainly includes the type such as rotary oscillation viscometer and vibrating-plate viscosimeter.Rotary oscillation viscometer is from vibration
The vibration period of body and logarithmic decrement try to achieve attenuation constant so as to obtain viscosity；Vibrating-plate viscosimeter is mainly by measuring thin slice
The magnitude determinations vibrated in a fluid obtain the size of viscosity.Generally, vibratory drilling method measurement is applied to low viscosity and a small amount of
The measurement of fluid sample.
Supercritical ultrasonics technology is reflected in solid and liquid two media surface using ultrasound wave, and capture reflected energy declines
Subtract the method that characteristic obtains liquid viscosity indirectly.Supercritical ultrasonics technology can realize not damaged on-line checking, good with quick, real-time
Advantage.But technical requirements are higher, cost intensive and immature development.
Capillary tube method measurement liquid viscosity is based on Ha Gen-poiseuille (Hagen-Poiseuille) law, according to capillary
The pressure difference at pipe two ends, long capillary tube and capillary inner diameter, liquid flows through the viscosity that the parameters such as the volume of capillary tube try to achieve liquid
Value.Capillary viscosimeter is high because of its certainty of measurement, simple structure, and the one kind for becoming most widely used in current liquid viscosity measuring is glued
Degree meter.Capillary tube method can be divided into absolute measurement and relative measurement, relative measurement because its need not to the size of capillary tube, flow,
Pressure parameters are measured, and process is relatively easy and the research that is widely used.
Multi-capillary viscometer measurement is the one kind in relative measurement, and patent 1143187 discloses a kind of two-pipe crow
Family name's viscometer；Patent US6745615 discloses a kind of utilization pressure differential decrescence and determines non-Newtonian fluid on multiple shear rates
Double standpipes/single capillary the viscometer of viscosity；1390302 patents CN1869642 disclose the two-pipe of a kind of constant pressure, adjustable speed
Capillary viscosimeter；Patent US4463598 discloses a kind of capillary viscosimeter of equiarm bridge-type two；Patent US7334457 is disclosed
Increase the multi-capillary viscometer measurement that valve improves fluid pressure difference sensing by changing measuring loop flow path in a kind of loop
System and method.Existing multi-capillary viscometer belongs to greatly off-line measurement, it is impossible to meets different conditions parameter and is particularly high pressure
The on-line measurement of fluid viscosity under hot conditionss.
The content of the invention
For the problem for overcoming above-mentioned prior art to exist, it is an object of the invention to provide a kind of for High Temperature High Pressure
Double capillary viscometer and its method of testing, the double capillary viscosity meter high precision, measuring method is simple.
In order to realize foregoing invention purpose, the present invention is adopted the technical scheme that：
A kind of double capillary viscometer for High Temperature High Pressure, including the constant flow pump 2 being connected with reagent bottle 1, with constant flow pump 2
The measurement pipeline of connection, on the pipeline that constant flow pump 2 is connected with measurement pipeline regulating valve 3 and filter 4, the measurement are provided with
Pipeline includes that upstream measures pipeline and measured downstream pipeline, and measured downstream pipeline connects liquid collecting bottle 31 by condenser 29, cold
Accurate counterbalance valve 30 is provided with the pipeline that condenser 29 is connected with liquid collecting bottle 31；The upstream measurement pipeline is included with the shape of coil pipe
The upstream test capillary tube 7 that formula is placed in upstream thermostat 12；The upstream thermostat 12 includes that being arranged at upstream test uses
The upstream temperature measuring thermometer 6 of the porch of capillary tube 7, the heated upstream silk 10 being placed in upstream thermostat 12, with heated upstream
The upstream DC heating power supply 9 of the connection of silk 10, the upstream being connected with upstream test capillary tube 7 and upstream DC heating power supply 9
PID radiator valves 11；The pipeline two ends of upstream test capillary tube 7 are respectively provided with upstream first pressure sensor 14 and upper
Trip second pressure sensor 15, arranges upstream poor between the upstream first pressure sensor 14 and upstream second pressure sensor 15
Pressure sensor 13；The measured downstream pipeline includes the downstream test capillary being placed in the form of coil pipe in downstream thermostat 22
Pipe 20；The downstream thermostat 22 includes being arranged at the downstream temperature measuring thermometer 18 of the porch of downstream test capillary tube 20, puts
The downstream heater strip 23 in downstream thermostat 22 is put, the downstream DC heating power supply 21 being connected with downstream heater strip 23, with
The trip test downstream PID radiator valve 24 of capillary tube 20 and the connection of downstream DC heating power supply 21, also including stretching into downstream
Agitator 25 in thermostat 22；The pipeline two ends of downstream test capillary tube 20 are respectively provided with downstream first pressure sensor
27 and downstream second pressure sensor 28, arrange between the downstream first pressure sensor 27 and downstream second pressure sensor 28
Downstream differential pressure pick-up 26；Also include and the upstream temperature measuring thermometer 6, downstream temperature measuring thermometer 18, upstream PID thermostatic controls
Device 11, downstream PID radiator valves 24, upstream differential pressure pick-up 13, upstream first pressure sensor 14, upstream second pressure are passed
The collection of sensor 15, downstream differential pressure pick-up 26, downstream first pressure sensor 27 and the connection of downstream second pressure sensor 28
System 16.
The upstream test uses the equivalently-sized of capillary tube 20 with capillary tube 7 and downstream test.
The constant flow pump 2 can provide the stable output of 0.01-9.99ml/min liquid volume flows.
The upstream test adopts upstream three-way joint 8 with capillary tube 7 and in front and back between flow pipe, pressure measxurement pipeline
Connection, the downstream test adopts downstream three way cock 19 with capillary tube 20 and in front and back between flow pipe, pressure measxurement pipeline
Connection.
The upstream test capillary tube 7 and downstream test capillary tube 20 are helically wound in a diameter of 150mm
Stainless steel metal cylinder on horizontal positioned, import and export leave the straight length of 100mm.
Arrange that a segment length is 300mm before the import of the upstream test capillary tube 7, material and caliber are tested with upstream
With the pre- thermo-capillary 5 in the identical upstream of capillary tube 7, arrange that a segment length is before the import of the downstream test capillary tube 20
300mm, material and caliber and the downstream test pre- thermo-capillary 17 in the identical downstream of capillary tube 20.
The upstream thermostat 12 adopts water bath heating, steady temperature to be arranged on 25 DEG C；The downstream thermostat 22
Heating is divided into two steps：25-240 DEG C adopts oil bath heating method, and molten salt bath heating is adopted higher than 240 DEG C.
The upstream test capillary tube 7 and downstream test capillary tube 20 are by 316 stainless steel machine-shapings, pipe range
For 3100mm, section is circle, 250 μm of nominal internal diameter, uniform diameter.
A kind of method of testing of double capillary viscometer for High Temperature High Pressure described above, comprises the steps：
Step 1：Select the fluid of physical property known to as standard flow, upstream test is tested with capillary tube 7 and downstream
Temperature T is respectively placed in capillary tube 200In the isoperibol of T, standard flow flows through successively upstream with default volume flow
Test capillary tube 7 and downstream test capillary tube 20, measure pipeline two ends pressure drop, obtain standard flow different permanent in upstream and downstream
Determine the viscosity ratio at temperature；
Wherein：Ref represents standard flow；
η is dynamic viscosity, unit Pas；
△ P be Capillary pressure drop, unit kPa；
Z=8L/ π R4, pipeline structure parameter is characterized, wherein：L is test capillary pipe length, and R is test capillary tube name
Adopted internal diameter；
Step 2：Upstream test capillary tube 7 and downstream test capillary tube 20 are respectively placed in into temperature T0With the constant temperature of T
In environment, detected fluid with step 1 identical volume flow flowing through successively upstream test capillary tube 7 and downstream test hair
Tubule 20, measures respectively pipeline two ends pressure drop, obtains viscosity ratio of the detected fluid under upstream and downstream difference steady temperature；
Wherein：Mea represents detected fluid；
Step 3：Upstream test capillary tube 7 is placed in into temperature T0Isoperibol in, standard flow and detected fluid point
Upstream test capillary tube 7 is not flowed through successively with identical volume flow, pipeline two ends pressure drop is measured respectively, obtain standard flow
With detected fluid in upstream steady temperature T0Under viscosity ratio；
Step 4：Detected fluid dynamic viscosity is calculated by following formula；
Measurement pipeline is rinsed using standard flow before the step 1 is carried out, quilt was adopted before the step 2 is carried out
Fluid measured rinses measurement pipeline.
The volume flow of test fluid used is weighed in real time to monitor by analytical balance 32 and is checked.
Compared to the prior art the present invention, has the advantage that：
1st, the dynamic of detected fluid can be directly obtained by the relativity of pressure signal between standard flow and detected fluid
Power viscosity, method of testing is simple, reproducible, and certainty of measurement is high.
2nd, the inventive method can realize fluid power under different conditions parameter (particularly high pressure-temperature harsh conditions)
The on-line measurement of viscosity.
Description of the drawings
Accompanying drawing is the structural representation of the present invention.
Specific embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
As shown in drawings, a kind of double capillary viscometer for High Temperature High Pressure of the present invention, including what is be connected with reagent bottle 1
Constant flow pump 2, the measurement pipeline being connected with constant flow pump 2 is provided with regulating valve 3 on the pipeline that constant flow pump 2 is connected with measurement pipeline
With filter 4, including upstream measurement pipeline and measured downstream pipeline, measured downstream pipeline passes through condenser 29 to the pipeline that measures
Connection liquid collecting bottle 31, is provided with accurate counterbalance valve 30 on the pipeline that condenser 29 is connected with liquid collecting bottle 31；The upstream measurement
Pipeline includes the upstream test capillary tube 7 being placed in the form of coil pipe in upstream thermostat 12；The upstream thermostat 12 is wrapped
The upstream temperature measuring thermometer 6 for being arranged at the porch of upstream test capillary tube 7 is included, the upstream being placed in upstream thermostat 12 adds
Heated filament 10, the upstream DC heating power supply 9 being connected with heated upstream silk 10, adds with upstream test capillary tube 7 and upstream direct current
The upstream PID radiator valve 11 of the connection of thermoelectric generator 9；The pipeline two ends of upstream test capillary tube 7 are respectively provided with upstream
One pressure transducer 14 and upstream second pressure sensor 15, the upstream first pressure sensor 14 and upstream second pressure are passed
Upstream differential pressure pick-up 13 is set between sensor 15；The measured downstream pipeline includes being placed in downstream thermostat 22 in the form of coil pipe
In downstream test use capillary tube 20；The downstream thermostat 22 includes being arranged under the porch of downstream test capillary tube 20
Trip temperature measuring thermometer 18, the downstream heater strip 23 being placed in downstream thermostat 22 is straight with the downstream that downstream heater strip 23 is connected
Stream heating power supply 21, the downstream PID radiator valves being connected with downstream test capillary tube 20 and downstream DC heating power supply 21
24, also including the agitator 25 stretched in downstream thermostat 22；The pipeline two ends of downstream test capillary tube 20 are respectively provided with
Downstream first pressure sensor 27 and downstream second pressure sensor 28, the downstream first pressure sensor 27 and downstream second
Downstream differential pressure pick-up 26 is set between pressure transducer 28；Also include and the upstream temperature measuring thermometer 6, downstream temperature measuring thermometer
18th, upstream PID radiator valves 11, downstream PID radiator valve 24, upstream differential pressure pick-up 13, upstream first pressure sensings
Device 14, upstream second pressure sensor 15, downstream differential pressure pick-up 26, downstream first pressure sensor 27 and downstream second pressure
The acquisition system 16 of the connection of sensor 28.Upstream PID radiator valve 11 and downstream PID radiator valve 24 realize constant temperature control
System, temperature fluctuation is less than 0.1 DEG C/h.Accurate counterbalance valve 30 realizes the finely regulating of viscometer operating pressure.
The upstream test uses the equivalently-sized of capillary tube 20 with capillary tube 7 and downstream test.
The constant flow pump 2 can provide the stable output of 0.01-9.99ml/min liquid volume flows.
As the preferred embodiment of the present invention, upstream test capillary tube 7 and flow pipe, the pressure measxurement in front and back
Connected using the 316 rustless steel upstream three-way joints 8 of aperture 0.25mm between pipeline, the downstream test with capillary tube 20 with it is front
Afterwards 316 rustless steel downstream three way cock 19 between flow pipe, pressure measxurement pipeline using aperture 0.25mm connect.Therefore disappear
Except the change of fluid fluidised form at pipe joint, it is ensured that flowing is stablized.
As the preferred embodiment of the present invention, the upstream test with capillary tube 7 and downstream test capillary tube 20 with
Spiral way is wrapped in horizontal positioned on the stainless steel metal cylinder of a diameter of 150mm, and import and export leave the straight length of 100mm.
Thermostat space can be so saved, double capillary viscometer compact in design is made；Simultaneously centripetal force is in pipe with small pipe diameter, larger radius of curvature
Serpentine pipe in effect can ignore.
As the preferred embodiment of the present invention, arrange that a segment length is before the import of the upstream test capillary tube 7
300mm, material and caliber and the upstream test pre- thermo-capillary 5 in the identical upstream of capillary tube 7, the downstream test capillary tube
A segment length is arranged before 20 import and preheats hair with the identical downstream of capillary tube 20 with downstream test for 300mm, material and caliber
Tubule 17.One of purpose is that fluid in pipe is heated to into assigned temperature by heating pipeline, it is ensured that pressure drop in test capillary tube
Measurement is carried out under constant temperature；The two of purpose are to increase the throttle resistance of test capillary tube upstream, it is ensured that flow of fluid
Stability.
Used as the preferred embodiment of the present invention, the upstream thermostat 12 adopts water bath heating, steady temperature to arrange
At 25 DEG C；The heating of the downstream thermostat 22 is divided into two steps：25-240 DEG C adopts oil bath heating method, adopts higher than 240 DEG C
Use molten salt bath heating.
As the preferred embodiment of the present invention, the upstream test with capillary tube 7 and downstream test capillary tube 20 by
316 stainless steel machine-shapings, pipe range is 3100mm, and section is circle, 250 μm of nominal internal diameter, uniform diameter.Standard flow
Flow with the capillary tube that detected fluid is in uniform diameter and draw ratio is big, it is thus eliminated that the kinetic energy amendment and import and export of fluid
Endgame correction.
As the preferred embodiment of the present invention, the upstream differential pressure pick-up 13, upstream first pressure sensor 14, on
Trip second pressure sensor 15, downstream differential pressure pick-up 26, downstream first pressure sensor 27 and downstream second pressure sensor
28 is serial using Rosemount3051, and signal recognition degree is high, and stability is strong.
Used as the preferred embodiment of the present invention, condenser 29 is a set of pipe heat exchanger, meets heat transfer requirements.
The operation principle of the present invention：
Fluid is pressurizeed with constant volume flow outflow by Jing constant flow pumps 2 in reagent bottle 1；After adjusted valve 3 and filter 4 according to
Secondary inflow upstream and downstream measure pipeline；Upstream measurement pipeline middle and upper reaches test capillary tube 7 is placed in temperature as T in the form of coil pipe
Upstream thermostat 12 in；Measured downstream pipeline middle and lower reaches test capillary tube 20 is placed in temperature as T in the form of coil pipe0Under
In trip thermostat 22；Fluid flows through the temperature of upstream test capillary tube 7 and is measured by upstream temperature measuring thermometer 6, imports and exports two ends
Test pressure is measured respectively by upstream first pressure sensor 14 and upstream second pressure sensor 15, imports and exports two ends test pressure
Difference is measured by upstream differential pressure pick-up 13；Fluid flows through the temperature of downstream test capillary tube 20 and is surveyed by downstream temperature measuring thermometer 18
Amount, imports and exports two ends test pressure and is measured by downstream first pressure sensor 27 and downstream second pressure sensor 28 respectively, enters
Outlet two ends test pressure differential is measured by downstream differential pressure pick-up 26；Upstream temperature measuring thermometer 6, downstream temperature measuring thermometer 18, upstream
PID radiator valves 11, downstream PID radiator valves 24, upstream differential pressure pick-up 13, upstream first pressure sensor 14, on
Trip second pressure sensor 15, downstream differential pressure pick-up 26, downstream first pressure sensor 27 and downstream second pressure sensor
28 signal enters acquisition system 16；Fluid flows through successively condenser 29 and accurate back pressure from after the outflow of measured downstream pipeline
Valve 30, finally flows into liquid collecting bottle 31；Accurate counterbalance valve 30 realizes the finely regulating of viscometer operating pressure；Analytical balance 32 is real-time
The volume flow of test fluid used is checked in monitoring of weighing.
Embodiment one
With hexamethylene as standard flow, normal octane is the double capillary viscosity determining procedure step for testing fluid to one kind：
The first step, standard flow rinses measurement pipeline.
Second step, standard flow flows through upstream test capillary tube 7 with 0.30ml/min volume flows and downstream test is used
Capillary tube 20,25 DEG C of the constant bath temperature in upstream, 50 DEG C of the constant bath temperature in downstream, downstream test is flat with the inlet and outlet pressure arithmetic of capillary tube 20
Average constant 5MPa, after flowing is stable each capillary tube two ends voltage drop value is recorded.
3rd step, detected fluid rinses measurement pipeline.
4th step, detected fluid flows through upstream test capillary tube 7 with 0.30ml/min volume flows and downstream test is used
Capillary tube 20,25 DEG C of the constant bath temperature in upstream, 50 DEG C of the constant bath temperature in downstream, downstream test is flat with the inlet and outlet pressure arithmetic of capillary tube 20
Average constant 5MPa, after flowing is stable each capillary tube two ends voltage drop value is recorded.
5th step, standard flow and detected fluid flow through upstream test capillary tube with 0.30ml/min volume flows respectively
7,25 DEG C of the constant bath temperature in upstream, the upstream test inlet and outlet pressure arithmetic mean of instantaneous value of capillary tube 7 constant 5MPa divides after flowing is stable
Other record standard fluid and detected fluid flow through the two ends voltage drop value of upstream test capillary tube 7.
Bring the dynamic viscosity value and required voltage drop value of 50 DEG C of standard flow into formula (4) respectively and calculate and obtain detected fluid
50 DEG C of dynamic viscosity value.
Embodiment two
One kind with toluene as standard flow, normal octane and normal heptane mass ratio 1:1 Binary Mixtures are test fluid
Double capillary viscosity determining procedure step：
The first step, standard flow rinses measurement pipeline.
Second step, standard flow flows through upstream test capillary tube 7 with 0.20ml/min volume flows and downstream test is used
Capillary tube 20,25 DEG C of the constant bath temperature in upstream, 100 DEG C of the constant bath temperature in downstream, the downstream test inlet and outlet pressure arithmetic of capillary tube 20
The constant 5MPa of meansigma methodss, after flowing is stable each capillary tube two ends voltage drop value is recorded.
3rd step, detected fluid rinses measurement pipeline.
4th step, detected fluid flows through upstream test capillary tube 7 with 0.20ml/min volume flows and downstream test is used
Capillary tube 20,25 DEG C of the constant bath temperature in upstream, 100 DEG C of the constant bath temperature in downstream, the downstream test inlet and outlet pressure arithmetic of capillary tube 20
The constant 5MPa of meansigma methodss, after flowing is stable each capillary tube two ends voltage drop value is recorded.
5th step, standard flow and detected fluid flow through upstream test capillary tube with 0.20ml/min volume flows respectively
7,25 DEG C of the constant bath temperature in upstream, the upstream test inlet and outlet pressure arithmetic mean of instantaneous value of capillary tube 7 constant 5MPa divides after flowing is stable
Other record standard fluid and detected fluid flow through the two ends voltage drop value of upstream test capillary tube 7.
Bring the dynamic viscosity value and required voltage drop value of 100 DEG C of standard flow into formula (4) respectively and calculate and obtain measured stream
The dynamic viscosity value that 100 DEG C of body.
Claims (8)
1. a kind of double capillary viscometer for High Temperature High Pressure, it is characterised in that：Including the constant flow pump being connected with reagent bottle (1)
(2) the measurement pipeline, being connected with constant flow pump (2), on the pipeline that constant flow pump (2) is connected with measurement pipeline regulating valve is provided with
(3) and filter (4), the measurement pipeline includes that upstream measures pipeline and measured downstream pipeline, and measured downstream pipeline is by cold
Condenser (29) connection liquid collecting bottle (31), on the pipeline that condenser (29) is connected with liquid collecting bottle (31) accurate counterbalance valve is provided with
(30)；The upstream measurement pipeline includes the upstream test capillary tube being placed in the form of coil pipe in upstream thermostat (12)
(7)；The upstream thermostat (12) includes the upstream temperature measuring thermometer (6) for being arranged at upstream test capillary tube (7) porch,
The heated upstream silk (10) being placed in upstream thermostat (12), the upstream DC heating power supply being connected with heated upstream silk (10)
(9) upstream PID radiator valves (11), being connected with upstream test capillary tube (7) and upstream DC heating power supply (9)；Institute
State upstream test capillary tube (7) pipeline two ends and be respectively provided with upstream first pressure sensor (14) and upstream second pressure sensing
Device (15), arranges upstream differential pressure pick-up between the upstream first pressure sensor (14) and upstream second pressure sensor (15)
(13)；The measured downstream pipeline includes the downstream test capillary tube being placed in the form of coil pipe in downstream thermostat (22)
(20)；The downstream thermostat (22) is including the downstream temperature measuring thermometer for being arranged at downstream test capillary tube (20) porch
(18) the downstream heater strip (23), being placed in downstream thermostat (22), the downstream direct current being connected with downstream heater strip (23) adds
Thermoelectric generator (21), the downstream PID thermostatic controls being connected with downstream test capillary tube (20) and downstream DC heating power supply (21)
Device (24), also including the agitator (25) stretched in downstream thermostat (22)；Downstream test capillary tube (20) pipeline two
End is respectively provided with downstream first pressure sensor (27) and downstream second pressure sensor (28), the downstream first pressure sensing
Downstream differential pressure pick-up (26) is set between device (27) and downstream second pressure sensor (28)；Also include and the upstream thermometric temperature
Degree meter (6), downstream temperature measuring thermometer (18), upstream PID radiator valves (11), downstream PID radiator valves (24), upstream are poor
Pressure sensor (13), upstream first pressure sensor (14), upstream second pressure sensor (15), downstream differential pressure pick-up
(26), downstream first pressure sensor (27) and the acquisition system (16) of downstream second pressure sensor (28) connection；On described
Trip test uses the equivalently-sized of capillary tube (20) with capillary tube (7) and downstream test；The constant flow pump (2) can provide 0.01-
The stable output of 9.99ml/min liquid volume flows.
2. a kind of double capillary viscometer for High Temperature High Pressure according to claim 1, it is characterised in that：The upstream
Test be connected using upstream three-way joint (8) between flow pipe in front and back, pressure measxurement pipeline with capillary tube (7), it is described under
Trip test is connected between flow pipe in front and back, pressure measxurement pipeline with capillary tube (20) using downstream three way cock (19).
3. a kind of double capillary viscometer for High Temperature High Pressure according to claim 1, it is characterised in that：The upstream
Test capillary tube (7) and downstream test capillary tube (20) are helically wound the stainless steel metal in a diameter of 150mm
Horizontal positioned on cylinder, import and export leave the straight length of 100mm.
4. a kind of double capillary viscometer for High Temperature High Pressure according to claim 1, it is characterised in that：The upstream
A segment length is arranged before the import of test capillary tube (7) for 300mm, material and caliber and upstream test capillary tube (7) phase
The same pre- thermo-capillary in upstream (5), arranges a segment length for 300mm, material before the import of the downstream test capillary tube (20)
Matter and caliber use the pre- thermo-capillary (17) in capillary tube (20) identical downstream with downstream test.
5. a kind of double capillary viscometer for High Temperature High Pressure according to claim 1, it is characterised in that：The upstream
Thermostat (12) adopts water bath heating, steady temperature to be arranged on 25 DEG C；The heating of the downstream thermostat (22) is divided into two
Step：25-240 DEG C adopts oil bath heating method, and molten salt bath heating is adopted higher than 240 DEG C.
6. a kind of double capillary viscometer for High Temperature High Pressure according to claim 1, it is characterised in that：The upstream
, by 316 stainless steel machine-shapings, pipe range is 3100mm, is cut for test capillary tube (7) and downstream test capillary tube (20)
Face is circle, 250 μm of nominal internal diameter, uniform diameter.
7. it is a kind of to be tested using the double capillary viscometer fluid viscosity for being used for High Temperature High Pressure as claimed in claim 1
Method, it is characterised in that：Comprise the steps：
Step 1：Select the fluid of physical property known to as standard flow, upstream test is used with capillary tube (7) and downstream test
Capillary tube (20) is respectively placed in temperature T0In the isoperibol of T, standard flow flows through successively upstream with default volume flow
Test capillary tube (7) and downstream test capillary tube (20), measurement pipeline two ends pressure drop, obtain standard flow in upstream and downstream not
With the viscosity ratio under steady temperature；
Wherein：Ref represents standard flow；
η is dynamic viscosity, unit Pas；
△ P be Capillary pressure drop, unit kPa；
Z=8L/ π R4, pipeline structure parameter is characterized, wherein：L is test capillary pipe length, and R is in test capillary tube name
Footpath；
Step 2：Upstream test capillary tube (7) and downstream test capillary tube (20) are respectively placed in into temperature T0With the constant temperature ring of T
In border, detected fluid with step 1 identical volume flow flowing through successively upstream test capillary tube (7) and downstream test hair
Tubule (20), measures respectively pipeline two ends pressure drop, obtains viscosity ratio of the detected fluid under upstream and downstream difference steady temperature；
Wherein：Mea represents detected fluid；
Step 3：Upstream test capillary tube (7) is placed in into temperature T0Isoperibol in, standard flow and detected fluid respectively with
Identical volume flow flows through successively upstream test capillary tube (7), respectively measure pipeline two ends pressure drop, obtain standard flow with
Detected fluid is in upstream steady temperature T0Under viscosity ratio；
Step 4：Detected fluid dynamic viscosity is calculated by following formula；
8. method according to claim 7, it is characterised in that：Rinsed using standard flow before the step 1 is carried out
Measurement pipeline, measurement pipeline was rinsed before the step 2 is carried out using detected fluid.
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| CN105675445B (en) * | 2016-03-25 | 2018-06-05 | 中国石油大学(华东) | Supercritical carbon dioxide capillary viscometer and application method under a kind of high temperature and pressure |
| CN108562514B (en) * | 2018-01-23 | 2024-04-12 | 中国石油大学(北京) | High-temperature high-pressure low-speed gas microtube viscosity measuring device and measuring method thereof |
| CN109142152B (en) * | 2018-10-08 | 2021-09-21 | 西南石油大学 | Double-capillary tube viscometer for measuring viscosity of acidic natural gas |
| CN109682720A (en) * | 2019-02-19 | 2019-04-26 | 黄山学院 | A kind of device and method detecting oil plant high temperature viscosity |
| CN111307663A (en) * | 2020-03-02 | 2020-06-19 | 上海交通大学 | Gas viscosity measuring device |
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