CN104502231A - Double capillary viscometer for high temperature and high pressure and test method thereof - Google Patents

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

A kind of double capillary viscosity meter for High Temperature High Pressure and method of testing thereof

Technical field

Fluid viscosity field of measuring technique of the present invention, is specifically related to a kind of double capillary viscosity meter for High Temperature High Pressure and method of testing thereof.

Background technology

Viscosity is one of important physical property of fluid, is used to the physical quantity characterizing fluid viscosity degree.Viscosity measurement plays an important role in the fields such as oil, chemical industry, traffic, metallurgy, medicine, food, building materials and national defence.Current Viscosity Measurement Methods mainly includes capillary tube technique, Constructional Elements Using Falling Methods, rotary process, vibratory drilling method and supercritical ultrasonics technology etc.

Rotating ratio juris is determined the viscosity of fluid in the viscosity moment of object or the rotating speed of object by measurement fluid matasomatism.Because it to the advantage that same material is measured under different shear rates, can be widely used in viscosity and the rheological characteristics of measuring Newtonian liquid and non-Newtonian liquid.Shortcoming is that required hardware device is more, and complex structure, price costly.

Falling bodies ratio juris utilizes object to fall suffered resistance in a liquid to measure the viscosity of fluid.Feature is that structure is simple, conveniently can carry out the measurement of high viscosity fluid viscosity.Shortcoming is only suitable for the larger Newtonian fluid of density measurement; During measurement for opaque liquid viscosity, need the induction installation using characteristic.

Vibratory drilling method mainly comprises the type such as rotary oscillation viscometer and vibrating-plate viscosimeter.Rotary oscillation viscometer is tried to achieve attenuation constant from vibration period of vibrating mass and logarithmic decrement thus obtains viscosity; Vibrating-plate viscosimeter obtains the size of viscosity mainly through the magnitude determinations that measurement thin slice vibrates in a fluid.Generally, vibratory drilling method measurement is applicable to the measurement of low viscosity and small amount of fluid sample.

Supercritical ultrasonics technology utilizes ultrasound wave to reflect at solid and liquid two media surface, catches the method that reflected energy attenuation characteristic obtains liquid viscosity indirectly.Supercritical ultrasonics technology can realize not damaged on-line checkingi, has the advantage quick, real-time is good.But technical requirement is higher, cost intensive and immature development.

It is based on Ha Gen-poiseuille (Hagen-Poiseuille) law that capillary tube technique measures liquid viscosity, and according to the pressure difference at kapillary two ends, long capillary tube and capillary inner diameter, liquid stream tries to achieve the viscosity number of liquid through the parameter such as volume of kapillary.Capillary viscosimeter because of its measuring accuracy high, structure is simple, becomes a kind of viscosity meter most widely used in current liquid viscosity measuring.Capillary tube technique can be divided into absolute measurement and relative measurement, and relative measurement does not need the size to kapillary, flow, pressure parameters to measure because of it, the process relatively simply research that is widely used.

Multi-capillary viscometer measurement is the one in relative measurement, and patent 1143187 discloses a kind of two-pipe Ubbelohde viscometer; Patent US6745615 discloses a kind of two standpipes/single capillary viscosity meter utilizing pressure differential decrescence to measure non-Newtonian fluid viscosity on multiple shearing rate; 1390302 patent CN1869642 disclose the two tube type capillary viscosity meter of a kind of constant voltage, adjustable speed; Patent US4463598 discloses a kind of equiarm bridge-type two capillary viscosimeter; Patent US7334457 discloses in a kind of loop and increases valve improves fluid pressure difference sensing multi-capillary viscometer measuring system and method by changing measuring circuit flow path.Existing multi-capillary viscometer mostly belongs to off-line measurement, can not meet the particularly on-line measurement of fluid viscosity under high pressure-temperature condition of different conditions parameter.

Summary of the invention

In order to overcome above-mentioned prior art Problems existing, the object of the present invention is to provide a kind of double capillary viscosity meter for High Temperature High Pressure and method of testing thereof, this double capillary viscosity meter precision is high, and measuring method is simple.

In order to realize foregoing invention object, the technical scheme that the present invention takes is:

A kind of double capillary viscosity meter for High Temperature High Pressure, comprise the constant flow pump 2 be connected with reagent bottle 1, the measurement pipeline be connected with constant flow pump 2, the pipeline that constant flow pump 2 is connected with measurement pipeline is provided with variable valve 3 and filtrator 4, described measurement pipeline comprises upstream and measures pipeline and measured downstream pipeline, measured downstream pipeline connects receiving liquid bottle 31 by condenser 29, and the pipeline that condenser 29 is connected with receipts liquid bottle 31 is provided with accurate counterbalance valve 30; Described upstream is measured pipeline and is comprised the upstream test kapillary 7 being placed in upstream thermostat 12 with the form of coil pipe; Described upstream thermostat 12 comprises the upstream temperature measuring thermometer 6 being arranged at upstream test kapillary 7 porch, be placed on the heated upstream silk 10 in upstream thermostat 12, the upstream DC heating power supply 9 be connected with heated upstream silk 10, the upstream PID radiator valve 11 be connected with kapillary 7 and upstream DC heating power supply 9 with upstream test; Described upstream test kapillary 7 pipeline two ends arrange upstream first pressure sensor 14 and upstream second pressure transducer 15 respectively, arrange upstream differential pressure pick-up 13 between described upstream first pressure sensor 14 and upstream second pressure transducer 15; Described measured downstream pipeline comprises the downstream test kapillary 20 being placed in downstream thermostat 22 with the form of coil pipe; Described downstream thermostat 22 comprises the downstream temperature measuring thermometer 18 being arranged at downstream test kapillary 20 porch, be placed on the downstream heater strip 23 in downstream thermostat 22, the downstream DC heating power supply 21 be connected with downstream heater strip 23, the downstream PID radiator valve 24 be connected with kapillary 20 and downstream DC heating power supply 21 with downstream test, also comprises the stirrer 25 stretched in downstream thermostat 22; Described downstream test kapillary 20 pipeline two ends arrange downstream first pressure transducer 27 and downstream second pressure sensor 28 respectively, arrange downstream differential pressure pick-up 26 between described downstream first pressure transducer 27 and downstream second pressure sensor 28; Also comprise the acquisition system 16 be connected with described upstream temperature measuring thermometer 6, downstream temperature measuring thermometer 18, upstream PID radiator valve 11, downstream PID radiator valve 24, upstream differential pressure pick-up 13, upstream first pressure sensor 14, upstream second pressure transducer 15, downstream differential pressure pick-up 26, downstream first pressure transducer 27 and downstream second pressure sensor 28.

Described upstream test kapillary 7 and downstream test kapillary 20 measure-alike.

Described constant flow pump 2 can provide the 0.01-9.99ml/min stable output of liquid volumetric flow rate.

The test of described upstream adopts upstream three-way joint 8 to be connected with between kapillary 7 and with between front and back flow pipe, pressure survey pipeline, and the test of described downstream adopts downstream three-way connection 19 to be connected with between kapillary 20 and with between front and back flow pipe, pressure survey pipeline.

Described upstream test kapillary 7 and downstream test kapillary 20 are wrapped in horizontal positioned on stainless steel metal cylinder that diameter is 150mm in a spiral manner, import and export the straight length leaving 100mm.

Arrange that a segment length is 300mm before the import of described upstream test kapillary 7, the pre-thermo-capillary 5 in the upstream that material is identical with upstream test kapillary 7 with caliber, arrange that a segment length is 300mm before the import of described downstream test kapillary 20, the pre-thermo-capillary 17 in the downstream that material is identical with downstream test kapillary 20 with caliber.

Described downstream thermostat 22 adopts water bath heating, and steady temperature is arranged on 25 DEG C; The heating of described downstream thermostat 22 is divided into two step: 25-240 DEG C to adopt oil bath heating, adopts molten salt bath heating higher than 240 DEG C.

Described upstream test kapillary 7 and downstream test kapillary 20 are by 316 stainless steel machine-shapings, and pipe range is 3100mm, and cross section is circular, nominal internal diameter 250 μm, uniform diameter.

The method of testing of a kind of double capillary viscosity meter for High Temperature High Pressure described above, comprises the steps:

Step 1: select the fluid of a known physical property as standard flow, upstream test kapillary 7 and downstream test kapillary 20 are placed in temperature T respectively ₀with in the isoperibol of T, standard flow flows through upstream test kapillary 7 and downstream test kapillary 20 successively with the volumetric flow rate preset, and measures the pressure drop of pipeline two ends, obtains the viscosity ratio of standard flow under the different steady temperature of upstream and downstream;

$\frac{{\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{ref}}}{{\mathrm{\η}}_{\mathrm{down},T}^{\mathrm{ref}}}=\frac{\mathrm{\Δ}{p}_{\mathrm{up},T_0}^{\mathrm{ref}}}{\mathrm{\Δ}{p}_{\mathrm{down},T}^{\mathrm{ref}}}\·\frac{Z_{\mathrm{down},T}}{Z_{\mathrm{up},T_0}}---\left(1\right)$

Wherein: ref represents standard flow;

η is kinetic viscosity, unit Pas;

△ P is Capillary pressure drop, unit kPa;

Z=8L/ π R ⁴, characterize pipeline structure parameter, wherein: L is test capillary pipe length, R is test kapillary name internal diameter;

Step 2: upstream test kapillary 7 and downstream test kapillary 20 are placed in temperature T respectively ₀with in the isoperibol of T, detected fluid flows through upstream test kapillary 7 and downstream test kapillary 20 successively with the volumetric flow rate identical with step 1, measure the pressure drop of pipeline two ends respectively, obtain the viscosity ratio of detected fluid under the different steady temperature of upstream and downstream;

$\frac{{\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{mea}}}{{\mathrm{\η}}_{\mathrm{down},T}^{\mathrm{mea}}}=\frac{\mathrm{\Δ}{p}_{\mathrm{up},T_0}^{\mathrm{mea}}}{\mathrm{\Δ}{p}_{\mathrm{down},T}^{\mathrm{mea}}}\·\frac{Z_{\mathrm{down},T}}{Z_{\mathrm{up},T_0}}---\left(2\right)$

Wherein: mea represents detected fluid;

Step 3: upstream test kapillary 7 is placed in temperature T ₀isoperibol in, standard flow and detected fluid flow through upstream test kapillary 7 successively with identical volumetric flow rate respectively, measure the pressure drop of pipeline two ends respectively, obtain standard flow and detected fluid at upstream steady temperature T ₀under viscosity ratio;

$\frac{{\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{mea}}}{{\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{ref}}}=\frac{\mathrm{\Δ}{p}_{\mathrm{up},T_0}^{\mathrm{mea}}}{\mathrm{\Δ}{p}_{\mathrm{up},T_0}^{\mathrm{ref}}}---\left(3\right)$

Step 4: calculate detected fluid kinetic viscosity by following formula;

${\mathrm{\η}}_{\mathrm{down},T}^{\mathrm{mea}}={\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{ref}}\left(\frac{{\mathrm{\η}}_{\mathrm{down},T}^{\mathrm{ref}}}{{\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{ref}}}\right){\left(\frac{{\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{mea}}}{{\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{ref}}}\right)}^{\frac{{\mathrm{\η}}_{\mathrm{down},T}^{\mathrm{mea}}}{{\mathrm{\η}}_{\mathrm{down},T}^{\mathrm{ref}}}}/\frac{{\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{mea}}}{{\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{ref}}}={\mathrm{\η}}_{\mathrm{down},T}^{\mathrm{ref}}\left(\frac{\mathrm{\Δ}{p}_{\mathrm{up},T_0}^{\mathrm{mea}}}{\mathrm{\Δ}{p}_{\mathrm{up},T_0}^{\mathrm{ref}}}\right)(\frac{\mathrm{\Δ}{p}_{\mathrm{down},T}^{\mathrm{mea}}}{\mathrm{\Δ}{p}_{\mathrm{up},T_0}^{\mathrm{mea}}}\·\frac{\mathrm{\Δ}{p}_{\mathrm{up},T_0}^{\mathrm{ref}}}{\mathrm{\Δ}{p}_{\mathrm{down},T}^{\mathrm{ref}}})---\left(4\right)$

Before carrying out described step 1, adopt standard flow to rinse measure pipeline, before carrying out described step 2, adopt detected fluid to rinse measure pipeline.

The volumetric flow rate of testing fluid used is checked by analytical balance 32 monitoring of weighing in real time.

Compared to the prior art, tool has the following advantages in the present invention:

1, directly can be obtained the kinetic viscosity of detected fluid by the relativity of pressure signal between standard flow and detected fluid, method of testing is simple, and reproducible, measuring accuracy is high.

2, the inventive method can realize the on-line measurement of fluid kinetic viscosity under different conditions parameter (particularly high pressure-temperature harsh conditions).

Accompanying drawing explanation

Accompanying drawing is structural representation of the present invention.

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 viscosity meter for High Temperature High Pressure of the present invention, comprise the constant flow pump 2 be connected with reagent bottle 1, the measurement pipeline be connected with constant flow pump 2, the pipeline that constant flow pump 2 is connected with measurement pipeline is provided with variable valve 3 and filtrator 4, described measurement pipeline comprises upstream and measures pipeline and measured downstream pipeline, and measured downstream pipeline connects receiving liquid bottle 31 by condenser 29, and the pipeline that condenser 29 is connected with receipts liquid bottle 31 is provided with accurate counterbalance valve 30; Described upstream is measured pipeline and is comprised the upstream test kapillary 7 being placed in upstream thermostat 12 with the form of coil pipe; Described upstream thermostat 12 comprises the upstream temperature measuring thermometer 6 being arranged at upstream test kapillary 7 porch, be placed on the heated upstream silk 10 in upstream thermostat 12, the upstream DC heating power supply 9 be connected with heated upstream silk 10, the upstream PID radiator valve 11 be connected with kapillary 7 and upstream DC heating power supply 9 with upstream test; Described upstream test kapillary 7 pipeline two ends arrange upstream first pressure sensor 14 and upstream second pressure transducer 15 respectively, arrange upstream differential pressure pick-up 13 between described upstream first pressure sensor 14 and upstream second pressure transducer 15; Described measured downstream pipeline comprises the downstream test kapillary 20 being placed in downstream thermostat 22 with the form of coil pipe; Described downstream thermostat 22 comprises the downstream temperature measuring thermometer 18 being arranged at downstream test kapillary 20 porch, be placed on the downstream heater strip 23 in downstream thermostat 22, the downstream DC heating power supply 21 be connected with downstream heater strip 23, the downstream PID radiator valve 24 be connected with kapillary 20 and downstream DC heating power supply 21 with downstream test, also comprises the stirrer 25 stretched in downstream thermostat 22; Described downstream test kapillary 20 pipeline two ends arrange downstream first pressure transducer 27 and downstream second pressure sensor 28 respectively, arrange downstream differential pressure pick-up 26 between described downstream first pressure transducer 27 and downstream second pressure sensor 28; Also comprise the acquisition system 16 be connected with described upstream temperature measuring thermometer 6, downstream temperature measuring thermometer 18, upstream PID radiator valve 11, downstream PID radiator valve 24, upstream differential pressure pick-up 13, upstream first pressure sensor 14, upstream second pressure transducer 15, downstream differential pressure pick-up 26, downstream first pressure transducer 27 and downstream second pressure sensor 28.Upstream PID radiator valve 11 and downstream PID radiator valve 24 realize thermostatic control, and temperature fluctuation is no more than 0.1 DEG C/h.Accurate counterbalance valve 30 realizes the finely regulating of viscosity meter working pressure.

Described upstream test kapillary 7 and downstream test kapillary 20 measure-alike.

Described constant flow pump 2 can provide the 0.01-9.99ml/min stable output of liquid volumetric flow rate.

As the preferred embodiment of the present invention, the test of described upstream is connected with between kapillary 7 and with adopting the 316 stainless steel upstream three-way joints 8 of aperture 0.25mm between front and back flow pipe, pressure survey pipeline, and the test of described downstream is connected with between kapillary 20 and with adopting the 316 stainless steel downstream three-way connections 19 of aperture 0.25mm between front and back flow pipe, pressure survey pipeline.Because this eliminating the change of fluid in pipe joint place fluidised form, ensure the stable of flowing.

As the preferred embodiment of the present invention, described upstream test kapillary 7 and downstream test kapillary 20 are wrapped in horizontal positioned on stainless steel metal cylinder that diameter is 150mm in a spiral manner, import and export the straight length leaving 100mm.Thermostat space can be saved like this, make double capillary viscosity meter compact in design; The effect of centripetal force in the spiral pipe of pipe with small pipe diameter, larger radius of curvature simultaneously can be ignored.

As the preferred embodiment of the present invention, arrange that a segment length is 300mm before the import of described upstream test kapillary 7, the pre-thermo-capillary 5 in the upstream that material is identical with upstream test kapillary 7 with caliber, arrange that a segment length is 300mm before the import of described downstream test kapillary 20, the pre-thermo-capillary 17 in the downstream that material is identical with downstream test kapillary 20 with caliber.One of object be by heating pipe line by fluid heating in pipe to assigned temperature, ensure that in test kapillary, drop measurement carries out under constant temperature; Two of object is the throttle resistances increasing test kapillary upstream, ensures the stability of fluid flowing.

As the preferred embodiment of the present invention, described downstream thermostat 22 adopts water bath heating, and steady temperature is arranged on 25 DEG C; The heating of described downstream thermostat 22 is divided into two step: 25-240 DEG C to adopt oil bath heating, adopts molten salt bath heating higher than 240 DEG C.

As the preferred embodiment of the present invention, described upstream test kapillary 7 and downstream test kapillary 20 are by 316 stainless steel machine-shapings, and pipe range is 3100mm, and cross section is circular, nominal internal diameter 250 μm, uniform diameter.Standard flow and detected fluid are in uniform diameter and flow in the large kapillary of length-diameter ratio, because this eliminating the kinetic energy correction of fluid and importing and exporting endgame correction.

As the preferred embodiment of the present invention, described upstream differential pressure pick-up 13, upstream first pressure sensor 14, upstream second pressure transducer 15, downstream differential pressure pick-up 26, downstream first pressure transducer 27 and downstream second pressure sensor 28 adopt Rosemount3051 series, signal recognition degree is high, and stability is strong.

As the preferred embodiment of the present invention, condenser 29 is double-pipe exchangers, meets heat transfer requirements.

Principle of work of the present invention:

Fluid to flow out with constant volume flow by pressurizeing through constant flow pump 2 in reagent bottle 1; After variable valve 3 and filtrator 4, flow into upstream and downstream successively measure pipeline; Upstream is measured pipeline middle and upper reaches test kapillary 7 and is placed in the form of coil pipe the upstream thermostat 12 that temperature is T; Measured downstream pipeline middle and lower reaches test kapillary 20 is placed in temperature for T with the form of coil pipe ₀downstream thermostat 22 in; The temperature that fluid flows through upstream test kapillary 7 is measured by upstream temperature measuring thermometer 6, import and export two ends test pressure to be measured by upstream first pressure sensor 14 and upstream second pressure transducer 15 respectively, import and export two ends test pressure differential and measured by upstream differential pressure pick-up 13; The temperature that fluid flows through downstream test kapillary 20 is measured by downstream temperature measuring thermometer 18, import and export two ends test pressure to be measured by downstream first pressure transducer 27 and downstream second pressure sensor 28 respectively, import and export two ends test pressure differential and measured by downstream differential pressure pick-up 26; The signal of upstream temperature measuring thermometer 6, downstream temperature measuring thermometer 18, upstream PID radiator valve 11, downstream PID radiator valve 24, upstream differential pressure pick-up 13, upstream first pressure sensor 14, upstream second pressure transducer 15, downstream differential pressure pick-up 26, downstream first pressure transducer 27 and downstream second pressure sensor 28 all enters acquisition system 16; Fluid flows through condenser 29 and accurate counterbalance valve 30 after flowing out from measured downstream pipeline successively, finally flows into and receives liquid bottle 31; Accurate counterbalance valve 30 realizes the finely regulating of viscosity meter working pressure; Analytical balance 32 is weighed in real time and is monitored the volumetric flow rate of check test fluid used.

Embodiment one

A kind of is standard flow with cyclohexane, and normal octane is the double capillary viscosity determining procedure step of test fluid flow:

The first step, standard flow is rinsed and is measured pipeline.

Second step, standard flow flows through upstream test kapillary 7 and downstream test kapillary 20 with 0.30ml/min volumetric flow rate, the constant bath temperature 25 DEG C in upstream, the constant bath temperature 50 DEG C in downstream, the constant 5MPa of downstream test kapillary 20 inlet and outlet pressure arithmetic mean, records each kapillary two ends voltage drop value after flowing is stable.

3rd step, detected fluid is rinsed and is measured pipeline.

4th step, detected fluid flows through upstream test kapillary 7 and downstream test kapillary 20 with 0.30ml/min volumetric flow rate, the constant bath temperature 25 DEG C in upstream, the constant bath temperature 50 DEG C in downstream, the constant 5MPa of downstream test kapillary 20 inlet and outlet pressure arithmetic mean, records each kapillary two ends voltage drop value after flowing is stable.

5th step, standard flow and detected fluid flow through upstream test kapillary 7 with 0.30ml/min volumetric flow rate respectively, the constant bath temperature 25 DEG C in upstream, the constant 5MPa of upstream test kapillary 7 inlet and outlet pressure arithmetic mean, after flowing is stable, record standard fluid and detected fluid flow through upstream test kapillary 7 two ends voltage drop value respectively.

The kinetic viscosity value of standard flow 50 DEG C and required voltage drop value are brought respectively into formula (4) and calculate the kinetic viscosity value obtaining detected fluid 50 DEG C.

Embodiment two

A kind of is standard flow with toluene, and the Binary Mixtures of normal octane and normal heptane mass ratio 1:1 is the double capillary viscosity determining procedure step of test fluid flow:

The first step, standard flow is rinsed and is measured pipeline.

Second step, standard flow flows through upstream test kapillary 7 and downstream test kapillary 20 with 0.20ml/min volumetric flow rate, the constant bath temperature 25 DEG C in upstream, the constant bath temperature 100 DEG C in downstream, the constant 5MPa of downstream test kapillary 20 inlet and outlet pressure arithmetic mean, records each kapillary two ends voltage drop value after flowing is stable.

3rd step, detected fluid is rinsed and is measured pipeline.

4th step, detected fluid flows through upstream test kapillary 7 and downstream test kapillary 20 with 0.20ml/min volumetric flow rate, the constant bath temperature 25 DEG C in upstream, the constant bath temperature 100 DEG C in downstream, the constant 5MPa of downstream test kapillary 20 inlet and outlet pressure arithmetic mean, records each kapillary two ends voltage drop value after flowing is stable.

5th step, standard flow and detected fluid flow through upstream test kapillary 7 with 0.20ml/min volumetric flow rate respectively, the constant bath temperature 25 DEG C in upstream, the constant 5MPa of upstream test kapillary 7 inlet and outlet pressure arithmetic mean, after flowing is stable, record standard fluid and detected fluid flow through upstream test kapillary 7 two ends voltage drop value respectively.

The kinetic viscosity value of standard flow 100 DEG C and required voltage drop value are brought respectively into formula (4) and calculate the kinetic viscosity value obtaining detected fluid 100 DEG C.

Claims (10)

1. the double capillary viscosity meter for High Temperature High Pressure, it is characterized in that: comprise the constant flow pump (2) be connected with reagent bottle (1), the measurement pipeline be connected with constant flow pump (2), the pipeline that constant flow pump (2) is connected with measurement pipeline is provided with variable valve (3) and filtrator (4), described measurement pipeline comprises upstream and measures pipeline and measured downstream pipeline, measured downstream pipeline connects receiving liquid bottle (31) by condenser (29), the pipeline that condenser (29) is connected with receipts liquid bottle (31) is provided with accurate counterbalance valve (30), described upstream is measured pipeline and is comprised the upstream test kapillary (7) being placed in upstream thermostat (12) with the form of coil pipe, described upstream thermostat (12) comprises the upstream temperature measuring thermometer (6) being arranged at upstream test kapillary (7) porch, be placed on the heated upstream silk (10) in upstream thermostat (12), upstream DC heating power supply (9) be connected with heated upstream silk (10), upstream PID radiator valve (11) be connected with kapillary (7) and upstream DC heating power supply (9) with upstream test, described upstream test kapillary (7) pipeline two ends arrange upstream first pressure sensor (14) and upstream second pressure transducer (15) respectively, arrange upstream differential pressure pick-up (13) between described upstream first pressure sensor (14) and upstream second pressure transducer (15), described measured downstream pipeline comprises the downstream test kapillary (20) being placed in downstream thermostat (22) with the form of coil pipe, described downstream thermostat (22) comprises the downstream temperature measuring thermometer (18) being arranged at downstream test kapillary (20) porch, be placed on the downstream heater strip (23) in downstream thermostat (22), downstream DC heating power supply (21) be connected with downstream heater strip (23), downstream PID radiator valve (24) be connected with kapillary (20) and downstream DC heating power supply (21) with downstream test, also comprises the stirrer (25) stretched in downstream thermostat (22), described downstream test kapillary (20) pipeline two ends arrange downstream first pressure transducer (27) and downstream second pressure sensor (28) respectively, arrange downstream differential pressure pick-up (26) between described downstream first pressure transducer (27) and downstream second pressure sensor (28), also comprise the acquisition system (16) be connected with described upstream temperature measuring thermometer (6), downstream temperature measuring thermometer (18), upstream PID radiator valve (11), downstream PID radiator valve (24), upstream differential pressure pick-up (13), upstream first pressure sensor (14), upstream second pressure transducer (15), downstream differential pressure pick-up (26), downstream first pressure transducer (27) and downstream second pressure sensor (28).

2. a kind of double capillary viscosity meter for High Temperature High Pressure according to claim 1, is characterized in that: described upstream test kapillary (7) and downstream test kapillary (20) measure-alike.

3. a kind of double capillary viscosity meter for High Temperature High Pressure according to claim 1, is characterized in that: described constant flow pump (2) can provide the 0.01-9.99ml/min stable output of liquid volumetric flow rate.

4. a kind of double capillary viscosity meter for High Temperature High Pressure according to claim 1, it is characterized in that: the test of described upstream is connected with between kapillary (7) and with adopting upstream three-way joint (8) between front and back flow pipe, pressure survey pipeline, the test of described downstream is connected with between kapillary (20) and with adopting downstream three-way connection (19) between front and back flow pipe, pressure survey pipeline.

5. a kind of double capillary viscosity meter for High Temperature High Pressure according to claim 1, it is characterized in that: described upstream test kapillary (7) and downstream test kapillary (20) are wrapped in horizontal positioned on stainless steel metal cylinder that diameter is 150mm in a spiral manner, import and export the straight length leaving 100mm.

6. a kind of double capillary viscosity meter for High Temperature High Pressure according to claim 1, it is characterized in that: before the import of described upstream test kapillary (7), arrange that a segment length is 300mm, the pre-thermo-capillary in the upstream (5) that material is identical with upstream test kapillary (7) with caliber, arrange before the import of described downstream test kapillary (20) that a segment length is 300mm, the pre-thermo-capillary in the downstream (17) that material is identical with downstream test kapillary (20) with caliber.

7. a kind of double capillary viscosity meter for High Temperature High Pressure according to claim 1, is characterized in that: described downstream thermostat (22) adopts water bath heating, and steady temperature is arranged on 25 DEG C; The heating in described downstream thermostat (22) is divided into two step: 25-240 DEG C to adopt oil bath heating, adopts molten salt bath heating higher than 240 DEG C.

8. a kind of double capillary viscosity meter for High Temperature High Pressure according to claim 1, it is characterized in that: described upstream test kapillary (7) and downstream test kapillary (20) are by 316 stainless steel machine-shapings, pipe range is 3100mm, cross section is circular, name internal diameter 250 μm, uniform diameter.

9. the method for testing of a kind of double capillary viscosity meter for High Temperature High Pressure according to claim 1, is characterized in that: comprise the steps:

Step 1: select the fluid of a known physical property as standard flow, upstream test kapillary (7) and downstream test kapillary (20) are placed in temperature T respectively ₀with in the isoperibol of T, standard flow flows through upstream test kapillary (7) and downstream test kapillary (20) successively with the volumetric flow rate preset, measure the pressure drop of pipeline two ends, obtain the viscosity ratio of standard flow under the different steady temperature of upstream and downstream;

$\frac{{\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{ref}}}{{\mathrm{\η}}_{\mathrm{down},T}^{\mathrm{ref}}}=\frac{{\mathrm{\Δp}}_{\mathrm{up},T_0}^{\mathrm{ref}}}{{\mathrm{\Δp}}_{\mathrm{down},T}^{\mathrm{ref}}}\·\frac{Z_{\mathrm{down},T}}{Z_{\mathrm{up},T_0}}---\left(1\right)$

Wherein: ref represents standard flow;

η is kinetic viscosity, unit Pas;

△ P is Capillary pressure drop, unit kPa;

Z=8L/ π R ⁴, characterize pipeline structure parameter, wherein: L is test capillary pipe length, R is test kapillary name internal diameter;

Step 2: upstream test kapillary (7) and downstream test kapillary (20) are placed in temperature T respectively ₀with in the isoperibol of T, detected fluid flows through upstream test kapillary (7) and downstream test kapillary (20) successively with the volumetric flow rate identical with step 1, measure the pressure drop of pipeline two ends respectively, obtain the viscosity ratio of detected fluid under the different steady temperature of upstream and downstream;

$\frac{{\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{mea}}}{{\mathrm{\η}}_{\mathrm{down},T}^{\mathrm{mea}}}=\frac{{\mathrm{\Δp}}_{\mathrm{up},T_0}^{\mathrm{mea}}}{{\mathrm{\Δp}}_{\mathrm{down},T}^{\mathrm{mea}}}\·\frac{Z_{\mathrm{down},T}}{Z_{\mathrm{up},T_0}}---\left(2\right)$

Wherein: mea represents detected fluid;

Step 3: upstream test kapillary (7) is placed in temperature T ₀isoperibol in, standard flow and detected fluid flow through upstream test kapillary (7) successively with identical volumetric flow rate respectively, measure the pressure drop of pipeline two ends respectively, obtain standard flow and detected fluid at upstream steady temperature T ₀under viscosity ratio;

$\frac{{\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{mea}}}{{\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{ref}}}=\frac{{\mathrm{\Δp}}_{\mathrm{up},T_0}^{\mathrm{mea}}}{{\mathrm{\Δp}}_{\mathrm{up},T_0}^{\mathrm{ref}}}---\left(3\right)$

Step 4: calculate detected fluid kinetic viscosity by following formula;

${\mathrm{\η}}_{\mathrm{down},T}^{\mathrm{mea}}={\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{ref}}\left(\frac{{\mathrm{\η}}_{\mathrm{down},T}^{\mathrm{ref}}}{{\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{ref}}}\right)\left(\frac{{\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{mea}}}{{\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{ref}}}\right)\frac{{\mathrm{\η}}_{\mathrm{down},T}^{\mathrm{mea}}}{{\mathrm{\η}}_{\mathrm{down},T}^{\mathrm{ref}}}/\frac{{\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{mea}}}{{\mathrm{\η}}_{\mathrm{up},T_0}^{\mathrm{ref}}}={\mathrm{\η}}_{\mathrm{down},T}^{\mathrm{ref}}\left(\frac{{\mathrm{\Δp}}_{\mathrm{up},T_0}^{\mathrm{mea}}}{{\mathrm{\Δp}}_{\mathrm{up},T_0}^{\mathrm{ref}}}\right)(\frac{{\mathrm{\Δp}}_{\mathrm{down},T}^{\mathrm{mea}}}{{\mathrm{\Δp}}_{\mathrm{up},T_0}^{\mathrm{mea}}}\·\frac{{\mathrm{\Δp}}_{\mathrm{up},T_0}^{\mathrm{ref}}}{{\mathrm{\Δp}}_{\mathrm{down},T}^{\mathrm{ref}}})---\left(4\right)$

10. method of testing according to claim 9, is characterized in that: before carrying out described step 1, adopt standard flow to rinse measure pipeline, adopts detected fluid to rinse and measured pipeline before carrying out described step 3.