CN205157372U - Rheological behavior survey device - Google Patents

Abstract

The utility model provides a rheological behavior survey device, the device includes: rotate ring canal analogue means, cross the pump and cut analogue means, wherein, it includes to rotate ring canal analogue means: ring canal, temperature sensor, pressure sensor and magnetism signal transducer, temperature sensor, pressure sensor and magnetism signal transducer set up in the ring canal, it includes to cross pump shearing mechanism: centrifugal pump and oil storage tank, oil storage tank both ends all are equipped with electric valve, and oil storage tank one end is connected to the backward flow hole of ring canal, the other end of oil storage tank passes through centrifugal pump connection and arrives the oil pumping hole of ring canal. The embodiment of the utility model provides a rotatory ring canal analogue means utilizes that two liquid end liquid level is poor confirms fluidic rheology parameter, has solved the runner and has flowed the fluid of simulator and glue the wall problem, carries out pump, backward flow simulation tests simultaneously, provides new means for fluid flow and real -time measurement in the simulation pipeline.

Description

A kind of rheological characteristics determinator

Technical field

The utility model relates to oil exploration technology, particularly about the rheological characteristics determination techniques of oil, is a kind of rheological characteristics determinator concretely.

Background technology

The mensuration of the indoor rheological parameter of crude oil is the basis of crude pipeline transportation technology Calculation, and the fluid flowed in pipeline is due to the distribution difference of its percentage speed variation on xsect, so the shearing effect suffered by the fluid of each position is different.For Newtonian fluid, its apparent viscosity and shear rate have nothing to do, and therefore can study its flowing in pipeline with rotational viscosimeter.For the waxy crude oil with non-newtonian fluid character, because rheological properties changes with its thermal history experienced and shear history, therefore, first must carry out flowing to end the consistent simulation of possibility with actual pipe to the thermal history of its flowing and shear history before measuring rheological parameter.

The pipe flow field simulation method of current use has three classes such as rotational rheometer, stirred pot and various types of test tracks.Even if this several analogy method is under identical thermal history condition, result difference is also very large.Rotational rheometer is easy to use, to the test of newton's body with do not consider history effect, measurement result accurately can be provided without the analytical test of thixotropic non-newtonian fluid, but to the simulation that the crude oil pipeline in non-newtonian fluid flows, because guillotine style and actual pipe stream exist difference, be difficult to obtain satisfied result.In addition, because test sample is few, easily form heterogeneous system, usually reduce the representativeness of sample.Stirred pot simulation is more close with actual pipeline in the temperature range of production run to the crude oil in newton's body, but because it can not accurate description shear resistance, there is no measurement function yet, simulation non-Newtonian crude and add agent oil low temperature flow section application on be restricted.Circuit analogue means is consistent with production pipeline in guillotine style, and non-newtonian fluid flow field simulation rheological being relied on to its flow history is comparatively reasonable.But traditional circuit device exists that detected fluid is frequent to be crossed pump and change shear history, calculate the problems such as caliber is uncertain, reduce the use value of analog result.

In order to simulate the pipe stream shear action of fluid, there is again the appearance such as annular circulating line observation device, wheel pipe flow simulating device successively, wherein the former promotes liquid at pipe Inner eycle by the plunger of a magnetically-actuated, the rheological parameter of detected fluid is determined by the measurement rate of change of pressure drop time and the period of motion of driver, latter utilizes swiveling wheel pipe to make the fluid partly riddled wherein produce relative motion, the viscosity of the moment of torsion determination liquid rotated by wheel pipe.

Utility model content

The utility model embodiment provides a kind of rheological characteristics determinator, and rheological characteristics determinator comprises: swivel eye pipe analogue means, shearing-through-pump simulation device; Wherein,

Described swivel eye pipe analogue means comprises: endless tube, temperature sensor, pressure transducer and magnetic signal sensor, and described temperature sensor, pressure transducer and magnetic signal sensor setting are in described endless tube;

Described pump-shear effect device comprises: centrifugal pump and storage tank, and described storage tank two ends are equipped with electrically operated valve, and described storage tank one end is connected to the return port of described endless tube, and the other end of described storage tank is connected to the oil pumping hole of described endless tube by centrifugal pump.

In the utility model one embodiment, centrifugal pump is connected to the oil pumping hole of described endless tube by flexible pipe, is provided with unidirectional electrical movable valve to control being communicated with of centrifugal pump and endless tube inside between described centrifugal pump with described endless tube.

In the utility model one embodiment, rheological characteristics determinator also comprises: temperature control box, and described swivel eye pipe analogue means and shearing-through-pump simulation device are all arranged at temperature control box.

In the utility model one embodiment, endless tube is fixed on temperature control box by the lacing wire of two angle of intersection, and the two ends difference clip of storage tank is in two lacing wires.

In the utility model one embodiment, the bottom when storage tank is positioned at oil pumping phase place, is provided with a manual ball valve.

In the utility model one embodiment, the radius-of-curvature of the annulus that endless tube is formed is 1000mm, and loop diameter is 50mm, and the tank of storage tank is long is 700mm, and external diameter is 75mm, and internal diameter is 65mm.

The swivel eye pipe analogue means that the utility model embodiment provides utilizes the rheological parameter of two liquid end liquid level difference determination fluids, and the fluid solving wheel flow simulator glues wall problem, and can carry out pump, backflow simulation test simultaneously.

For above and other object of the present utility model, feature and advantage can be become apparent, preferred embodiment cited below particularly, and coordinate institute's accompanying drawings, be described in detail below.

Accompanying drawing explanation

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

The schematic diagram of Fig. 1 a kind of rheological characteristics determinator disclosed in the utility model;

The endless tube inner fluid schematic diagram of Fig. 2 rheological characteristics determinator disclosed in the utility model;

The pump process schematic excessively of Fig. 3 rheological characteristics determinator disclosed in the utility model;

The reflux course schematic diagram of Fig. 4 rheological characteristics determinator disclosed in the utility model;

The plate circuit communication view of Fig. 5 rheological characteristics determinator disclosed in the utility model;

The schematic diagram of Fig. 6 embodiment of rheological characteristics determinator disclosed in the utility model.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.

The utility model embodiment discloses a kind of rheological characteristics determinator, as shown in Figure 1, the schematic diagram of rheological characteristics determinator disclosed in the utility model, this rheological characteristics determinator comprises: swivel eye pipe analogue means, shearing-through-pump simulation device; Wherein,

Swivel eye pipe analogue means comprises: endless tube 101, temperature sensor, pressure transducer and magnetic signal sensor, temperature sensor, pressure transducer and magnetic signal sensor setting be (wherein each sensor setting is in endless tube, does not indicate in figure) in endless tube;

Shearing-through-pump simulation device comprises: centrifugal 102 pumps and storage tank 103, and storage tank 102 two ends are equipped with electrically operated valve, and storage tank one end is connected to the return port of endless tube 101, and the other end of storage tank 103 is connected to the oil pumping hole of endless tube 101 by centrifugal pump 102.

The purpose of this utility model is to provide a kind of device of simulating fluids within pipes flowing and measuring in real time, flows and realize the Real-time Collection of the rheological characteristicss such as viscosity between the multistation of simulation whole piece crude oil pipeline.Below in conjunction with specific embodiment, technical solutions of the utility model are elaborated:

Rheological characteristics determinator of the present utility model comprises rheological characteristics determinator and shearing-through-pump simulation device, wherein, in the utility model embodiment, swivel eye pipe analogue means comprises: pipe stream shearing simulation system, data collection and transfering system, environment temperature control system, data handling system form, and are described respectively below to each system.

1, pipe stream shearing simulation system comprises: stainless steel endless tube, drive unit and control box, radius of curvature R=the 1000mm of stainless steel endless tube in the present embodiment, endless tube internal diameter d=50mm, drive unit is by two stepless speed regulation monophase machines, reduction gear ratio is respectively 30B and 100B, can make any rotational speed of endless tube between 1 ~ 15r/min, the shearing rate scope of endless tube is at 20-300s ^-1between.

2, data collection and transfering system: by Pt100 temperature sensor, YZD type pressure transducer (measurement range 0 ~ 40kPa, class of accuracy 0.1 grade), KMI18 magnetic signal sensor, data acquisition board and brush (brush, the sliding contact body of conduction current) composition.When rotor aligns with the center line of magnetic head, lucky corresponding annulus minimum point, to determine annulus minimum point.

3, the environment temperature control system in this enforcement comprises: casing, heating system, refrigeration system and intelligent control system.

A, casing:

Require in the present embodiment that the design temperature of endless tube temperature-controlling system is 0 ~ 70 DEG C.Consider according to the requirement of design temperature and heat insulation layer material performance requirement etc., polyethylene foams suits the requirements, and can meet the requirement of refrigeration and insulation two aspects simultaneously.According to shape size and the layout of circuit pipelining simulation device, determine that the height of the casing in the present embodiment is 2.25m, length is 1.80m, and wide is 0.50m.Considering the thickness choosing casing is 70mm.

B, heating system: comprise heating arrangement and blower fan;

In the present embodiment, heating arrangement is the U-shaped heating tube (two heating rate driving heating arrangement is about 0.3 DEG C/min) of two power 1.5kW, in the below of heating tube, 1 Fans is respectively installed simultaneously, air in case is circulated when measuring, and heating tube heat radiation evenly.

C, refrigeration system:

In the present embodiment, refrigeration system is made up of compressor, evaporator, condenser, expansion valve four essential parts.A complete set of equipment copper pipe connects, and forms a sealed circulation system.What refrigeration modes adopted is steam compression type refrigerating.In steam compression type refrigerating, the steam of working medium (cold-producing medium) is first compressed to higher pressure, changed into liquid by external refrigeration medium (air) cooling, again through adiabatic expansion, pressure and temperature is reduced simultaneously, utilizes the vaporization of worker quality liquid under low-pressure to get final product absorption refrigeration.Steam after vaporization sucks compression by compressor again, constantly circulates.The compressor selected in this device is piston type air compressor.Its rate of temperature fall of compressor refrigeration system is about 0.7 DEG C/min.

D, intelligent control system:

Intelligent control system in the present embodiment adopts XM808P Self-tuning System expert PID control instrument, and Real-time Collection spin manifold temperature value also carries out time scale output control to cut-offfing of heating tube.This instrument can carry out the programming Control of Temperature-time-temperature, thus determines the temperature drop rate of air in casing, achieves the accurate analog of crude pipeline transportation temperature drop.

4, data handling system: comprise computing machine and corresponding monitoring calculation program, in the present embodiment, the maximum acquisition rate of signal is 300 points/s.

The measuring principle of the swivel eye pipe analogue means rheological characteristics in the utility model embodiment is described as follows:

Fluid flows in circular ring pipe, is subject to tube wall shear power, fluid gravity and acts on the centrifugal action that the pressure of two liquid levels and tube wall pressure, circular motion produce.Obviously, the centrifugal force that tube wall pressure and circular motion produce balances mutually.Like this for a certain infinitesimal section, fluid is subject to tube wall shear power, infinitesimal section fluid weight and acts on the pressure effect of infinitesimal section two liquid level, at steady state three's moment and be zero.

Suppose that the internal diameter of endless tube is r ₀, annulus radius-of-curvature is R ₀, front liquid angle is θ ₁, rear liquid angle is θ ₂, oil density is ρ, gets infinitesimal section dl as research object, as shown in Figure 2, if front liquid angle AOD is θ ₁, rear liquid angle BOD is θ ₂, in fluid column, get an infinitesimal section dl, the angle of infinitesimal section and horizontal direction is θ, and to be the scope of d θ, θ be for the central angle of its correspondence

Fluid during steady flow, has in endless tube

dW _τ+dW _G+dW _P＝0(1)

In formula:

DW _τthe moment that-infinitesimal section tube wall shear power produces;

DW _gthe moment that-infinitesimal section gravity produces;

DW _p-act on infinitesimal section pressure at two ends produce moment;

1. obvious, whole fluid column section is had:

∫dW _P＝0(2)

2. the moment that during fluid flowing, tube wall shear power produces

When the fluid in endless tube is in laminar condition, fluid pipe walls shearing rate is

${\stackrel{\·}{\mathrm{\γ}}}_w=\frac{3n^{\′}+1}{4n^{\′}}\frac{8V}{d_0}---\left(3\right)$

In formula, n' is rheological behavior index.Power-law fluid n=n', its tube wall shear power τ _wfor:

${\mathrm{\τ}}_w={\mathrm{\μ}}_a{\stackrel{\·}{\mathrm{\γ}}}_w---\left(4\right)$

When endless tube rotating speed is time, by formula (3) (4) power-law fluid endless tube wall shear stress be:

Its moment relative to rotation center produced is:

W _τ＝τ _wA _w·R ₀(6)

Wherein, A _wfor the surface area of oil-containing pipeline section wall.

Wherein, L ₁, L ₂by θ respectively ₁and θ ₂corresponding front liquid segment length L ₁, rear liquid segment length L ₂

For Newtonian fluid, n=1, endless tube wall shear stress is:

Its moment relative to rotation center produced is:

3. the moment of endless tube inner fluid gravity generation:

Gravity suffered by infinitesimal section: $dG={\mathrm{\ρg\πr}}_0^2{R}_{0}d\mathrm{\θ}$

The moment relative to the center of circle that infinitesimal section produces: dW _g=dGR ₀cos θ

The moment then produced due to fluid bias when endless tube rotates is:

$W_G={\∫}_{\frac{3\mathrm{\π}}{2}-{\mathrm{\θ}}_2}^{\frac{3\mathrm{\π}}{2}+{\mathrm{\θ}}_1}{\mathrm{\ρg\πr}}_0^2{R}_0^2\cos \mathrm{\θ}d\mathrm{\θ}=2{\mathrm{\ρ\πr}}_0^2{R}_0^2\sin \frac{{\mathrm{\θ}}_2+{\mathrm{\θ}}_1}{2}\sin \frac{{\mathrm{\θ}}_2-{\mathrm{\θ}}_1}{2}---\left(10\right)$

4. Newtonian fluid viscosity measurement principle

Newtonian fluid viscosity measurement principle can be obtained by formula (1), (2), (9), (10):

By distortion, can obtain:

H is liquid level potential difference in rear and front end in endless tube: $h=2R_{0}sin\frac{{\mathrm{\θ}}_2+{\mathrm{\θ}}_1}{2}sin\frac{{\mathrm{\θ}}_2-{\mathrm{\θ}}_1}{2}$

Like this, only need obtain pressure history by computer acquisition, by the relative position of pressure history determination unique point, thus determine the parameter ω in formula (11), (12) _m, θ ₁, θ ₂, h, L1, L2, just can calculate the viscosity of detected fluid.

5. the measuring principle of non-Newtonian fluid viscosity

Formula (11), (12) are only suitable for the viscosity test of Newtonian fluid, and for the non-Newtonian fluid irrelevant with the time, this formula is inapplicable, but still can measure its rheological with bustle pipe arrangement.

When fluid flows in pipeline, wall shear stress τ _wcalculated by formula (1), (2), (6), (10):

${\mathrm{\τ}}_w=\frac{{\mathrm{\ρg\πr}}_0^{2}h}{A_w}=\frac{{\mathrm{\ρgr}}_{0}h}{2(L_1+L_2)}---\left(13\right)$

Any place's shear stress of non-Newtonian fluid tube stream can be expressed as pipe stream eigenwert function.

For power-law fluid ${\mathrm{\τ}}_w=K_p{\left(\frac{8V}{d_0}\right)}^n---\left(14\right)$

Wherein, K _pfor integration constant.Therefore, can by a series of for power-law fluid recurrence obtains power-law exponent.

Different fluids is flowed in pipeline and has different velocity profiles w=w (r).Usually for general non-Newtonian fluid, its tube wall shear rate is: ${\stackrel{\·}{\mathrm{\γ}}}_w=\frac{3n^{\′}+1}{4n^{\′}}\frac{8V}{d_0}---\left(15\right)$

In formula, n' is performance index, and power-law fluid has n=n'.Therefore the tube wall shear rate of power-law fluid is

${\stackrel{\·}{\mathrm{\γ}}}_w=\frac{3n+1}{4n}\frac{8V}{d_0}---\left(16\right)$

Formula is out of shape, the rheological equation of power-law fluid can be obtained:

K is consistency index,

$K=K_p{\left(\frac{4n}{3n+1}\right)}^n---\left(18\right)$

for tube wall shear rate, its value can be tried to achieve by formula (16).

The apparent viscosity of non-Newtonian fluid is obtained by formula (19):

${\mathrm{\μ}}_a=\frac{{\mathrm{\τ}}_w}{{\stackrel{\·}{\mathrm{\γ}}}_w}---\left(19\right)$

Like this, one group is measured thus determine one group of τ _w~ 8V/d ₀.For power-law fluid, by a series of τ _w~ 8V/d ₀recurrence can obtain the performance index n of fluid, and through type (18) tries to achieve the consistency index of fluid, thus obtains the rheological equation of power-law fluid.For general non-Newtonian fluid, then by a series of τ _w~ 8V/d ₀recurrence can obtain the performance index n' of fluid, then tries to achieve tube wall shearing rate by formula (15) then make relation curve, i.e. the rheological curve of fluid, thus judge fluid stream become type, by selecting suitable rheological equation, matching being carried out to experimental data, determines rheological parameter.

Swivel eye pipe die intends device normalization:

For ensureing the confidence level of swivel eye pipe analogue means data, by use 0.2%HPAM solution by the viscometer calibration device demarcated.Time prepared by 0.2%HPAM solution, HPAM is slowly added gradually in the distilled water stirred; HPAM dispersed with stirring is opened and evenly, in each beaker, distilled water total amount is within 1.5L.Setting paddle 600r/min rotating speed, stirs 20h at normal temperatures, until without macroscopic granule in solution, illustrates and dissolve fully.If exceed half a day apart from preparation before use solution, again 3min must be stirred with glass bar.

Standard visicosity measure instrument: accumulating laboratory HAAKE-VT550 coaxial cylinder viscometer.

The measurement result of table 1 pipe conveying device and viscosity meter contrasts

Note 1) experiment condition: bath temperature 20 DEG C, shearing rate setting 0 ~ 100s ^-1and 100s ^-1~ 0.

As shown in table 1, at shearing rate 43.5 ~ 86.2s ^-1time, the measurement result relative error of pipe conveying device and viscosity meter is within 5%; At shearing rate 30 ~ 40s ^-1time neighbouring, both measuring result error are within 10%; 30s is less than at shearing rate ^-1time following, both relative errors are comparatively large, illustrate when shearing rate is higher, and the accuracy of device is good, and along with the reduction of shearing rate, the operate power of motor, away from rated range, causes the increase of relative error.In general, pipe conveying device can carry out pipe flow field simulation within the specific limits and measure the viscosity data close with reality.

In addition, endless tube there are two temperature sensors in the utility model embodiment, consider its timing signal, use the electronic thermometer measuring tempeature of German IKA company in identical position simultaneously.When electronic thermometer be shown as 5.7 DEG C time, endless tube environment temperature sensor shows 6.3 DEG C, temperature sensor shows 5.5 DEG C on fixing endless tube, and error, within 1 DEG C, illustrates temperature control in allowed limits.

Rheological characteristics determinator of the present utility model also comprises pump-shear effect simulation system, makes device of the present utility model to measure rheological characteristics, and the passing pump simulation that simultaneously also can carry out oil sample is sheared.

Passing pump simulation cutting system utilizes small-size centrifugal pump that crude oil in pipe is extracted in a storage tank be fixed on endless tube under endless tube stop state, and then notes winding pipe, completes an oil sample passing pump simulation thus and shears.The crude oil at the scene interior shearing rate flowed of situation centrifugal pump can reach 10 ⁴s ^-1the order of magnitude, during design passing pump simulation device, being obtain higher shear rate, have employed small-size centrifugal pump, is 5000s simulating in pump experiment most high shear rate ^-1, and actual condition is comparatively close.

The centrifugal pump of loop system carries out pump-shear effect simulation to actual condition, also follows the principle that energy dissipation is equal.Because the pump-shear effect rate for specified temp, specific oil sample is certain, namely under specific circumstances, the energy dissipation of pump once crossed by crude oil is certain.And on-the-spot pump-shear effect rate is comparatively large, thus energy dissipation is also larger, so will increase the number of times of pump according to actual conditions when simulating, making the energy dissipation of oil sample equal with the energy dissipation of on-the-spot oil sample, reaching the object of quantitative simulation.

When ignoring pump housing heat radiation, fluid is crossed pump temperature rise and is in fact comprised the temperature rise that the interior viscous dissipation of flowing of Isoentropic Compression Temperature Rise and pump causes.For the small-size centrifugal pump that this device uses, lift is little, the discharge pressure of pump is not high, the contribution of energy increment in work done during compression convection cell can be ignored, so cross the temperature rise of pump with the pump time just can calculate the energy dissipation that oil sample crosses pump excessively by measuring oil sample, compare with the data of scene reality, determine the number of times of simulating pump.Repeatedly mistake pony pump is utilized to carry out the shearing simulation to on-the-spot mammoth pump.

1, apparatus design scheme:

In order to add shearing-through-pump simulation device, be fixed on endless tube by centrifugal pump and storage tank, storage tank one end is connected with endless tube by small-size centrifugal pump, and the other end is directly connected with endless tube, has electrically operated valve to control to be communicated with closed two junctions.With the interface of centrifugal pump for pumping hole, another interface is return port.In the present embodiment, storage tank is fixed on endless tube with certain angle, be the pump excessively and backflow simulation that meet oil sample, certain relation should be met between oil pumping mouth and refluxing opening, pump and these two processes of backflow could be completed smoothly, in theory, when mouth of pumping is positioned at minimum point, refluxing opening being positioned at, endless tube second quadrant can meet the requirement of pump and backflow, but when considering crude oil backflow in storage tank, crude oil has certain viscosity, can be attached on the inwall of storage tank, storage tank angle of inclination should be tried one's best greatly, sample oil is back in endless tube preferably, so, refluxing opening should be positioned at this third quadrant of endless tube as far as possible near the position of Y-axis, when so just can ensure to reflux, storage tank angle of inclination is maximum, backflow reaches best effect.Because when storage tank is perpendicular to X-axis, may there is exhaust phenomenon oil in centrifugal pump, therefore storage tank is not orthogonal to X-axis.

When needing to carry out passing pump simulation, rotate endless tube, make oil pumping hole be positioned at minimum point, start centrifugal pump and crude oil can be made to cross pump, enter into storage tank; Afterwards endless tube is turned over certain angle, utilize the Action of Gravity Field of crude oil to make crude oil be back in endless tube, prepare to simulate next time.

1. to pump pump process:

As shown in Figure 3, for crossing pump process schematic, hole of now pumping is positioned at minimum point, linked up by soft conduit and centrifugal pump (magnetic drive pump), company's general electric valve between the two controls, and when doing pipe flow field simulation, motorized valve is cut out, so do not affect pipe flow field simulation.Because crude oil during pipe flow field simulation is sealed in endless tube, out cross pump from oil pumping hole to need to overcome atmospheric pressure, so need the motorized valve of oil pumping hole and return port to open when crossing pump simultaneously, realize storage tank and being communicated with completely in endless tube, elimination atmospheric pressure affects, and crude oil can pump into storage tank smoothly.In like manner, during crude oil backflow, also need two place's motorized valves to open simultaneously, realize reflux course.Oil pumping hole and return port utilize mutually, for pump process and the reflux course excessively of crude oil provide condition.

Selecting to cross pump in this position is because now the suction point of centrifugal pump is positioned at the minimum point of endless tube, due to liquid level in endless tube, comparatively pump suction point is high, now just compressing into pump, being conducive to centrifugal pump drains only by crude oil in all pipes, make all oil samples experience pump-shear effect, avoid the irreducible oil not having pump to have an impact to simulated experiment.

Along with the crude oil in endless tube is extracted in storage tank by centrifugal pump, in storage tank, the liquid level of crude oil will constantly rise, and the liquid levels simultaneously in endless tube will constantly decline, and the liquid level at a time in endless tube is by the final liquid level lower than oil storage pot liquid.Now PIP is lower than output end pressure, will certainly cause the backflow of some liquid, likely causes the repetition pump-shear effect of some oil sample.For addressing this problem, added a liquid non-return valve door in the utility model embodiment between centrifugal pump and storage tank, due to the existence of one-way cock, liquid can only enter into storage tank and can not flow back in endless tube.So far crude oil completed pump, entered the process of storage tank.

2. crude oil reflux course:

As shown in Figure 4, be crude oil reflux course schematic diagram, when crude oil refluxes, endless tube need be rotated certain angle, the opening part of return port is positioned at the positive dirction of the X-axis of the annulus axle center coordinate that is the center of circle, and like this, storage tank entirety is positioned at above X-axis, at this time open motorized valve, by Action of Gravity Field, the crude oil in storage tank is got back in endless tube through refluxing opening, then closes motorized valve, meanwhile, for next step pipe flow field simulation is ready.

In the utility model embodiment, electrically operated valve is there are also installed between refluxing opening and storage tank, in pipe flow field simulation process, the motorized valve of this motorized valve and oil pumping mouth all cuts out, and storage tank and endless tube is kept apart, does not affect pipe flow field simulation, open during backflow, when crude oil is all back to after in endless tube, then valve-off, for pipe flow field simulation is ready next time.

3. power supply plan:

Centrifugal pump and electrically operated valve are fixed on endless tube by pump-shear effect scheme, because endless tube during pipe flow field simulation gyrates, if use wired power supply, supply lines cannot connect, otherwise will the winding between electric wire and axle be caused in the process of pipe flow field simulation, experiment is finally caused to carry out, and in the whole process of pipe flow field simulation, temperature control box is by the environment residing for endless tube, carry out temperature control, according to the programed temperature preset, be equivalent to an air bath, in the process, temperature field can not change, namely can not circulate with outside air in temperature control box, so directly manual ON or power-off cannot be carried out to the electrical equipment on endless tube, the scheme of wired like this power supply is just unworkable.

The utility model embodiment can through the flexible plug of temperature control tank wall by embedding one on temperature control box, flexible plug is connected with power supply in outside, by flexible plug with power supply is introduced, and coordinate relay the power supply of introducing to be provided to electrically operated valve, to control the opening and closing of electrically operated valve when needing pump or backflow.

Specific practice in the present embodiment is, an aperture (diameter is about about 1cm) is bored on temperature control box, fix with material, the plug (hollow, interior live wire is connected with extraneous power supply) being slightly less than aperture with is powered to the equipment on endless tube through this hole.Because perforate is less and there is filled with plugs centre, close to sealing state, with less to Influence of Temperature Field, negligible.

This embodiment of the utility model by relay and attaching plug with the use of, attaching plug front end is two contact chips that power lead picks out, contact with the contact chip that motorized valve is drawn and be communicated with after inserting, effectively power to centrifugal pump, and opening of motorized valve can be controlled by button and close, complete passing pump simulation task, Figure 5 shows that attaching plug inserts the schematic diagram of jack.

When endless tube rotates, be fixed on centrifugal pump on endless tube and motorized valve does not work, only carry out passing pump simulation oil pumping to need to power with during two processes refluxed, because now endless tube is fixed, circuit on endless tube can be collected and pick out, the position when position when pumping and backflow picks out the place near temperature control box access attaching plug respectively, is communicated with the power supply realized equipment with plug.

When endless tube needs to turn to backwash deployment from oil pumping position, power supply cannot be connected, and driven by motor endless tube cannot be used to rotate, and for realizing this process, can use the dislocation of hand rotation electric motor back shaft, reach the object that crude oil is refluxed from temperature control box.

In addition, oil pumping process and reflux course will certainly cause the mass distribution of whole system to change, thus cause the moment unbalance relative to motor shaft, and the use of plate circuit is except solving powerup issue, fixing endless tube can also be played in these two processes, the effect not making it rotate because moment changes, contributing to carrying out smoothly of experiment, is a method of killing two birds with one stone.

When this simulation system carries out passing pump simulation, crude oil can not directly be got back in endless tube after extracting out, needs first transferring storage to storage tank, thus enables crude oil experience pump-shear effect, be back in endless tube afterwards again and proceed pipe flow field simulation.Because storage tank is also within temperature control box, so want to bear certain high temperature, and weight will be tried one's best gently, to install, therefore, in the utility model embodiment to the selection of storage tank with reference to following parameter:

1, material:

Pass through the contrast to some materials and experiment, final choice ABS (AcrylonitrileButadieneStyrene) engineering plastics are as the making material of storage tank, this material has and can bear higher temperature, and combination property is better, and impact strength is higher, this material is high molecular polymer, stable chemical performance, insulating property are good, and softening point is greater than 90 DEG C, and light specific gravity, 1.06g/cm ³.ABS engineering plastics have the glossiness appearance of goods tool, and water-intake rate is low, and crude oil can be avoided to be attached to the surface of storage tank as far as possible, can be good at meeting experiment needs.

2, shape:

The moment unbalance of whole system must be caused after endless tube with the addition of centrifugal pump and storage tank, make whole system relative to motor shaft equalising torque so balancing weight will be added to whole system.Consider that the load of whole endless tube and motor output shaft is limited, so load and counterweight all should be as far as possible little, are beneficial to the smooth operation of whole system.Endless tube is evenly fixing by four lacing wires, if storage tank is laid and improperly will be unfavorable for the stable of endless tube.When will consider installation in addition, storage tank should, between oil pumping hole and return port, be convenient to install as far as possible.

According to above requirement, finally determine that storage tank shape is a long 0.7m, external diameter 75mm, the cylindrical tank of internal diameter 65mm.The volume of storage tank is 2.3L, and the half of endless tube internal volume is 1.9L, and first such a design meets crude oil from capacity and cross the requirement that pump enters into storage tank.Secondly, the weight of minimizing balancing weight that can be maximum when so oval column type is installed is designed to.Shown in Fig. 6, when installation, storage tank 701 is crossing with two lacing wires 702 of fixing endless tube, as being fixed together by clip lacing wire, while dispersion moment distribution, also serves the stabilization to whole loop system.Storage tank is crossing with lacing wire fixedly mount after, two ports, respectively close to oil pumping mouth and refluxing opening, use flexible pipe to be flexible coupling with oil pumping mouth and refluxing opening, like this, both be conducive to install, also can avoid in operation process due to relative movement cause to the destruction be tightly connected.

Due to frequent, different crude oil is measured, so want frequent replacing oil sample.Storage tank, except plaing a part except store buffer when pump crossed by crude oil, can also play the effect changed and measure oil sample.Before not adding pumping unit and storage tank, change crude oil in endless tube to need oil drain valve's (being originally arranged on a valve on endless tube) to be placed in minimum point, open valve and will manage interior crude oil outflow, then endless tube joint is dismantled, by needing the oil sample measured to pour into pipe from joint, completing and once changing oil.

After having installed storage tank, what this process was become is easily simple.Bottom storage tank, (system is when pumping phase place) has installed a manual ball valve, this ball valve is opened for long, if need to change oil sample, crude oil is pumped into manual rotary ball valve after in storage tank, the connection of storage tank and endless tube is swum and dismantles the ninth of the ten Heavenly Stems and storage tank can be unloaded the function that can realize changing oil sample, equally, also can operate equally when needing to clean endless tube inwall.

The selection of centrifugal pump:

In whole simulation system, centrifugal pump is the core of whole device, and installation and the result of power supply on experiment of centrifugal pump have direct impact, and the centrifugal pump used in this device is MP-15R magnetic centrifugal pump.

This centrifugal pump uses shaftless Seal Design, and the pump housing seals completely, can not cause the leakage of liquid, be suitable for the experiment to crude oil in the defeated process of pump.And higher shearing rate can be realized, the pump-shear effect relatively experienced in actual Crude Oil Transportation.

Magnetic force driven centrifugal pump (abbreviation magnetic drive pump), is made up of motor, magnetic coupling and the corrosion-resistant centrifugal pump housing usually.Its principal feature utilizes magnetic coupling to transmit power, completely without revealing.When motor drives the outer magnetic cylinder of magnetic coupling to rotate, the magnetic line of force is through gap and spacer sleeve, and act on the interior magnetic cylinder on pump shaft, pump rotor and motor synchronous are rotated, and mechanical is transmitting torque contiguously.At the power intake of pump shaft, because liquid is closed in static spacer sleeve, there is no motive seal, thus completely without revealing.Main material uses CFRPP material, has good corrosion resistance and durability, is suitable for carrying out simulated experiment for a long time.

1. centrifugal pump is fixing:

Centrifugal pump uses clamp to be directly fixed on endless tube, is filled with padded coaming between clamp and endless tube, and when preventing centrifugal pump from working, vibrations cause damage to endless tube.

Consider equally and shake the problem that causes, centrifugal pump intake end is directly fixed near endless tube oil pumping hole, is connected with mouth of pumping with flexible pipe, prevents the slight vibrations because pump work causes and affects and be tightly connected.

2. back-flow preventer:

The outlet of centrifugal pump has installed a single-phase valve, the crude oil backflow that this non-return valve prevents storage tank liquid level in oil pumping process from constantly raising and causes, thus causes pump incomplete sum to repeat to shear.

3. the centrifugal technical data required for the pump of MP-15R:

Exit inside diameter: 16mm;

Inlet inside diameter: 16mm;

Maximum flow: 17L/min;

The most high-lift: 2.7m;

Rated flow: 8L/min;

Rated head: 1.5m;

Output power: 25W;

Pump chamber: 20mL.

The swivel eye pipe analogue means that the utility model embodiment provides utilizes the rheological parameter of two liquid end liquid level difference determination fluids, the fluid solving wheel flow simulator glues wall problem, simultaneously, real-time measurement can be completed in the actual Flows process of simulation, carried out pump, backflow simulation test, for the flowing of simulation fluids within pipes and real-time measurement provide a kind of new means.

Apply specific embodiment in the utility model to set forth principle of the present utility model and embodiment, the explanation of above embodiment just understands method of the present utility model and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.

Claims (6)

1. a rheological characteristics determinator, is characterized in that, described rheological characteristics determinator comprises: swivel eye pipe analogue means, shearing-through-pump simulation device; Wherein,

Described swivel eye pipe analogue means comprises: endless tube, temperature sensor, pressure transducer and magnetic signal sensor, and described temperature sensor, pressure transducer and magnetic signal sensor setting are in described endless tube;

Described pump-shear effect device comprises: centrifugal pump and storage tank, and described storage tank two ends are equipped with electrically operated valve, and described storage tank one end is connected to the return port of described endless tube, and the other end of described storage tank is connected to the oil pumping hole of described endless tube by centrifugal pump.

2. rheological characteristics determinator as claimed in claim 1, it is characterized in that, described centrifugal pump is connected to the oil pumping hole of described endless tube by flexible pipe, is provided with unidirectional electrical movable valve to control being communicated with of centrifugal pump and endless tube inside between described centrifugal pump with described endless tube.

3. rheological characteristics determinator as claimed in claim 2, it is characterized in that, described rheological characteristics determinator also comprises: temperature control box, and described swivel eye pipe analogue means and shearing-through-pump simulation device are all arranged at temperature control box.

4. rheological characteristics determinator as claimed in claim 3, it is characterized in that, described endless tube is fixed on described temperature control box by the lacing wire of two angle of intersection, and the two ends difference clip of described storage tank is in two lacing wires.

5. rheological characteristics determinator as claimed in claim 1, is characterized in that, the bottom when storage tank is positioned at oil pumping phase place, is provided with a manual ball valve to change oil sample.

6. the rheological characteristics determinator as described in claim arbitrary in claim 1-5, is characterized in that, the radius-of-curvature of the annulus that described endless tube is formed is 1000mm, loop diameter is 50mm, the tank of storage tank is long is 700mm, and external diameter is 75mm, and internal diameter is 65mm.