SU1357791A1 - Device for determining rheological properties of oil - Google Patents

Abstract

The invention contributes to the rheological study of liquids, mainly semi-structured oils. The purpose of the invention is to improve the determination accuracy by eliminating the friction losses of the working agent by creating a pressure drop directly on the sample under investigation. The pressure drop is created in the capillary only by the action of the capillary forces, the lower limit of the pressure drop can be 0.00002 kg / cm. 2 Il. DO L

Description

11357791, 2

The invention relates to the rheology of the measuring line 16, and the body 5 of the hermetic examination of liquids, noted with a mechanical seal 12.

property weakly structured: Through the tube 15 and the valve 14 from the isneft oil of the working agent source, to the inner end of the invention — an increase in the exact space of the body 5 serves

to determine the rheological working agent, the gas, and create in the confederations of oil by eliminating losses in pressure 5, which simulates the plastic friction of the working agent over the current. In this case, it is necessary to use pressure drop creation directly as a working agent, naturally on the test sample and gask, which is at temperature and.

The experience of the device. The experience pressure would not be dissolved in

FIG. G given the device, the studied sample of oil. Then

longitudinal incision; in fig. 2 - the same, valve 14 overlap. In such a vervid from the top .15 the vertical position of the oil column, the device for determining the reconditioning in the capillary 4 due to the different properties of the oil includes in the capillary pressure of the capillary and the transparent capillary tube 1.4 tube 1 and capillary 3 cork 2. the lower end of which is wound up in pro-. Then the device is made of a vertical glass jar glass cork 2. In the cork of the 20 position is transferred into. working position- 2 radial capillary is made. Z.Nizhnie. For this, case 5 with the capillary end of the capillary tube 1 with the inlet tube 1 and the stopper 2 is installed into the cavity of the radial capillary so that the radial capillary 3. The diameter of the capillary 3 stopper 2 you-3 stopper 2 is occupied l the horizontal one is half an order larger than the diameter of the 25nd, and the capillary tube 1 was the capillary 4 tube 1. The capillary is located at an angle about to the horizontal tube 1 with the plug 2 placed in the gertal plane. The magnitude of the angle (the labeled transparent case 5 is established in advance by contacting it with the help of the most complete filling of the sleeve 6 with the holes 7 and the sleeve 8 30 nor the capillary 4 by the time the holes 9 are installed. One end of the body 5 between the drop of the capillary with the help of the mechanical seal of the 10 radial pressure and the pressure of the column is pivotally fixed on the rack 11. Other samples of oil in the capillary 4. The end of the housing 5 using the end face. In this position, the meniscus of the test seal -12 is hinged 5 nave and moves in the capillary 4. When on the split bar 13. Case 5, achieving equilibrium, the capillary differential through valve 14 is connected with the pressure and pressure of the column 15 to the source of the working oil sample in the capillary motion meta (not shown) The motion is stopped. During the movement. Determination of the rheological properties of the 40 bottom along the capillary 4 of the proizneft using the device measures the path and time of movement.

in the following way. meniscus. It uses the dimension

Through the capillary tube 4 capillary tube line 16 and the clock. Measurements are made.

ki 1 and radial capillary p 3 probkin the entire length of the capillary 4 to the full

2 pre-pass the easy 45 meniscus stops. The more oil is produced (kerosene, hexane or measurements, the better the quality.), Then tube 1 with plug 2, the characteristic is obtained, the sample is dried, the good sample of oil is ensured, and the wettability of the capillary walls of the sample of oil under study is obtained. QQ After this processing

By immersing the tube 2 with pipe-results. For this, on a segment of 1 in the vertical position in expander 4 between two measurements of the path, the following oil is filled and time is used to determine the flow rate (Q) of the radial capillary 3 and part by the formula 4 breakdown investigated 55 S bl / t,

of oil. Then the plug 2 with the tube 1 where S is the cross-sectional area of the vertical position is brought into the capillary 4;

the sleeve 6, and the upper end of the tube 1 — L1 — is the length of the path between the inter-sleeve b, after which it is set by two measurements.

Then, for the length of the path l1, the average gradient of the shear rate is determined by the formula

9

tg-

(with- ),

where Q is the fluid flow rate in section J is the radius of the capillary 4 of the capillary tube 1.

The shear stress is then determined by the formula

DR-g 21

(dyn / cm)

e g is the radius of the capillary 4 of the capillary tube 1; 1 - capillary filling length

tube 1; LR - average pressure drop,

under the action of which the oil moves along the capillary 4 on the D1 segment:

AP (1, - l;) y,., E Ijj - The length of the oil column in the capillary 4 with the established equilibrium between the differential capillary pressure and the pressure of the oil column; 1 |. - arithmetic average length of the oil column between two measurements; UN the proportion of the investigated

oil; oi - capillary angle of inclination

tube.

Then, the differential viscosity coefficient ((n),

where 1 is the shear stress;

V is the gradient of the flow velocity

oil,

From the obtained points, the rheological curves of the dependence of the velocity gradient on the shear stress or on the viscosity of the oil on the shear stress are plotted.

Claims (1)

Invention Formula A device for determining the rheological properties of petroleum, including capillary tube for the test sample, the ends of which are communicated with is-. working agent, that is, in order to improve the accuracy of determination by elimination of friction losses of the working agent due to the creation of a pressure drop directly on the test sample, one end of the capillary tube is inserted into the plug, in which a radial capillary is perpendicular to the capillary tube, with the said end of the capillary tube being introduced into the cavity of the radial capillary, the diameter of which is larger the capillary tube diameter, and the ends of the capillary tube with the source of the working agent are connected by placing the capillary tube with a stopper in a transparent sealed housing connected to the source of the working agent, while the radial capillary of the tube is horizontal and the capillary tube is inclined to the horizontal plane. ten. 7 2 76 at ..,, /, / / / / / / f. .i y // 7 7 If y / // DG - V - ESSSS Editor V.Danko Compiled by V.Voschankin Tehred L. Serdyukova Proofreader M. Maksimishinets Order.5989 / 41 Circulation 776 Subscription VNII1Sh State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4