SU1140006A1 - Device for determination of visco-elastic media plastic viscosity - Google Patents

Abstract

The TSH DEVICE FOR DETERMINATION OF PLASTIC VISCOSITY OF VISCOPLASTIC MEDIA, containing a constant flow master, a system of capillaries of various diameters included in the hydrodynamic bridge scheme, in the opposite-half arms of which there are capillaries of the same diameter and length, and the adjacent shoulders of the bridge are interdaprotect, and they are interdaprotec, and the inter-fair-flow beams are inter-aplica, and the inter-fair-flow beams are encapsulated in the inter-flexile blocks, and the inter-flexi-lengths are interdapragonal, and the inter-flexi-lengths are inter-aplica, and the interdapframes are encapsulated in the interpacts of the interplexes in the snadeploshnye armholes of the interplexes of the interpracts of the interplexes of the interplexes in the snadeploshnyh shoulders of the interparaplica of the interpacts, and the inter-flexile blocks of the inter-flexile blocks have lengths within the snadeploshnye shoulders which are interdisapix of the VFs. to which a differential pressure meter is connected, characterized in that, in order to increase the measurement accuracy by eliminating the influence of the ICOH of capillary effects, additionally in each of the counter the positive shoulders of the bridge are consistently connected to a capillary with the same diameter, equal to the diameter of the capillary in the adjacent shoulder, and with a length at which the ratio of the difference between the lengths of the capillaries of smaller diameter to the difference of the lengths of capillaries of larger diameter equals the ratio of the smaller diameter of the capillaries to the larger. iKsA. cab

Description

The invention relates to the control of measuring equipment, namely, caglide viscous etriu and can be used to determine plastic viscosity in plastic media, in particular drilling fluids. A capillary viscometer is known, consisting of two successively connected fluors of the same diameter, but of different length, two differential pressure meters, which measure the change in pressure on each of the tubes when propelling the test medium with capillaries at different flow rates. Plastic viscosity is determined from the difference in output signals of differential pressure gauges by 1 by lj. However, such a viscometer has a low measurement accuracy, and it also does not directly measure the plastic viscosity of the medium. The most close to the invention is a plastic viscosity measuring device containing a flow rate control nocToHHHoio, a capillary system of various diameters includedHbix in the hydrodynamic circuit of aVa in the opposite arms of which there are capillaries of the same diameter and length, and the adjacent shoulders of the bridge are connected by means of small-sized chambers to which a 2J differential pressure gauge is connected. The known device makes it possible to directly measure the plastic viscosity in the ecoplastic samples, however, it does not provide sufficient measurement accuracy due to the effect on the result of measuring the capillary effects. The purpose of the invention is to improve the accuracy of measuring plastic viscosity by eliminating c: t; -1 nor the end effects of capillaries. The goal is achieved by the fact that in the device for plastic viscosity and optic plastic media containing a constant flow setting device, the capillary system is of various diameters included in the hydraulic circuit; a bridge is located, opposite the capillaries about; 1 diameters and lengths, and the adjacent shoulders of the bridge are connected by means of a microcapillary of the X chambers to which a differential pressure gauge is connected, additionally 1 of the prototype. The bridge is sequentially switched on with a capillary with the same diameter equal to the diameter of the capillary in the adjacent arm, and with a length at which the ratio of the difference between the lengths of the capillaries of the exchange1: its diameter to the difference of the lengths of the capillaries of larger diameter equals the ratio of the smaller diameter of the capillaries to the larger. This capillary compound provides full compensation for pressure loss at the ends of the capillaries and TteM eliminates the cncTGfratic error of measuring plastic viscosity by. end effects capillary. The drawing shows a graphical device for determining plastic viscosity. The device consists of a constant flow setting device 1, a capillary system limited by input 2 and output 3 chambers, between which two parallel () 1 e capillary branches are enclosed; One of them consists of series-connected canisters 4 and 5 of larger diameter and capillaries 6 and 7 of smaller diameter, and the second consists of series-connected jets 8 and 9 of large diameter and capillaries 10 and 11 of smaller diameter. Melsda capillaries 6 and 5 and between capillaries 10 and 9, intercapillary chambers 12 and 13, respectively, are connected, respectively, to differential pressure gauge 14. A secondary device 15 is connected to the latter. Capillary lengths 4 and 9, 6 and 11, 5 and 8 , 7 and 10 are pairwise equal, and the ratio of the length spacing of capillaries 6, 7, 10 and 11 of smaller diameter to the difference of lengths of capillaries 4, 5j 8 and 9 of larger diameter equals the ratio of smaller diameter of capillaries to larger. Intercapillary chambers may also be included between the capillaries 4ib, 5i7, 8i10, 9 and 11. The device works as follows. at once. The medium under study is pumped through the capillaries of the sys- tem with the help of a constant flow sensor (; yes 1. Due to the equal hydraulic resistance) w consistently connected circuits 4, 6, 5 and 7 and 8, 10, 9 and 11, as well as 1 hydraulic Amer resistors 12 and 13 through each of the parallel branches of the capillaries flows the same amount of liquid.

31140006Л

When the medium flows through the capillaries 4 and 6 on the yoke: a pressure drop occurs

Р - Р - fJJSlQ + 16 1 + dr 4- / 12Ш + li 12-1 f + лР (1)

m 2 - Vyo4 TvG1 H UD 3 D P +

s-75

and when the medium flows through the capillus hey /

- (T5 H- (T. (-pressure in chambers 2 where P, RZ D and 3, respectively; -diameter of capillaries 4, 5, 8 and 9; D - diameter of capillaries 6, 7, 10 and 11; i - length capillaries 4 and 9; 2 — capillary length 5 and 8;, - capillary length 7 and 10. I capillary length 6 and 11; (2 - plastic viscosity; CQ - ultimate shear stress; 1G / 128TO 16 lIoW., l + fn lirDT- 1 / UD Similarly to 1G / 1 2 LU, pressure is determined, i.) (v.,). (J) (t; - "; p, .j 3) g P ,. • D & P 5yR | pressure loss from end effects of capillaries 4, 6, 5, and 7, respectively; P. — pressure in the intercapillary chamber 12; Q — flow rate of the medium in the capillary. Since the capillary diameters ditch 5 4 are equal, and the diameter of the capillary is 6 wounds to the diameter of the capillary 7, and the consumption of food in the capillaries 4, 5, 6 and 7 is single, then, and iiP, a, and On the basis of (1) and (2) pressure intercapillary chamber 12 cancer 16; JoWj ji4. + P + pi (3) 3 D) H i2) + i, + t-.j uj in the intercapillary chamber 13 128 (+ L the ratio of the larger diameter of the capillaries to the smaller equal to the ratio of the length of the long and short capillaries. The differential pressure measured in the intercapular chambers of this device is AP, - & P the length and diameter of the long and short capillaries, respectively; iRu., pressure losses from end effects on long and short capillaries which depend on the properties and flow rates of the pumped medium as well as on the diameters of the capillaries. As can be seen from (7), the result of measuring plastic viscosity contains a systematic error from the difference in pressure loss on the end effects of capillaries of different diameters, which reaches, for example, for drilling fluids 5% or more. In the described device, this difference is fully compensated, which makes it possible to increase the measurement accuracy by 5%, the accuracy of the plastic viscosity measurement is simple, and the ability to record a parameter to be determined ensures the successful application of the proposed device in the oil and petrochemical industries. The use of the device in those "; ; These processes will not only control the quality of the medium, but also regulate plastic viscosity in order to obtain a medium with predetermined technological properties. Measurement of plastic viscosity, in addition, can be used to obtain information about the state of disperse systems, HanpiiMep their dispersion, which will improve the technical and economic indicators of production, and therefore obtain the economic effect of its use. The use of the device in drilling processes, for example, provides a technical and economic effect due to the continuous control of plasticity, which allows a focused purpose to regulate the rheological properties of drilling mud and thereby reduce the cost bta of their preparation and processing.

Claims (1)

DEVICE FOR DETERMINING VLASTIC VISCOSITY OF VISCOPLASTIC MEDIA, containing a constant flow rate adjuster, a system of capillaries of various diameters included in a hydrodynamic bridge circuit, on the opposite shoulders of which are placed capillaries of the same diameter a differential pressure gauge is connected, characterized in that, in order to increase the accuracy of measurement by eliminating the influence of the end effects of capillaries, additionally in each of the counter The main shoulders of the bridge consistently include a capillary with the same diameter, equal to the diameter of the capillary in the adjacent arm, and with a length at which the ratio of the difference in the length of capillaries of smaller diameter to the difference in length of capillaries of larger diameter is equal to the ratio of the smaller diameter of the capillaries to the larger. Yakai. about About ©