Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Viscosity
Patent
1995-02-22
1997-08-19
Williams, Hezron E.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Viscosity
73 5441, G01N 1110
Patent
active
056591292
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the field of investigations and analytical study of materials and it may be advantageously used for determination of critical parameters and physico-chemical, in particular, viscoelastic properties of various fluid media in oil and gas extraction, petrochemical and chemical industries, biology, biochemistry, medicine, etc.
Known in the prior art is a device designed to determine the parameters of a fluid medium and to monitor their variations, which device comprises a rocker rotatably suspended to a twistable cord. The rocker is swingable by an electromagnetic drive and carries, on one of its arms, a photoelectric transducer responsive to angular displacements and, on its opposite arm, a braking element dipped into a fluid medium under study (Ref. French Patent No. 2,620,226; G 01 N 11/14; 1989). However, the prior-art device suffers from a number of limitations, viz. it has a sophisticated mechanical structure, it has a poor sensitivity, it cannot be used under pressures different from atmospheric pressure, it employs time-consuming measurement procedures.
Also known in the prior art is a device adapted to determine parameters of a fluid medium, which device comprises a base plate a piezoelectric drive secured to the base plate and connected via a dielectric element to a piezoelectric receiver having a filament with a ball dipped into a fluid medium to be studied, the medium being poured into a thermostat-equipped vassel (U.S. Pat. No. 4,799,378; Int. Cl. G 01 N 11/16; 1989). The latter device also has a number of disadvantages, since it has a complicated structural arrangement, it cannot be used at high pressures, it has a low quality factor.
Equally known in the art is a device for determination of parameters of a fluid medium, which device comprises a hollow oscillator rigidly secured to a cantilever, a drive adapted to cause the oscillator to vibrate simultaneously at different vibratory modes, and vibration detection means, the drive and the detection means being formed as piesoelectric elements (Ref. Japanese accepted Application No. 67-7251; Int. Cl.G 01 N 9/00; 1986). The above-cited device has limited possibilities and is used mainly for density measurements. Besides, its sensitivity is rather low.
Also known in the art is a device adapted to determine parameters of a fluid medium, which device comprises a hollow pipe dipped into a medium under study, a piezoelectric drive rigidly attached to the hollow pipe, and a sensitive element (Ref. EP Application No. 0,297,032; Int. Cl.G 01 N 11/16; 1988). The art-known device also suffers from a great time lag, a poor accuracy and a low sensitivity.
The present invention makes departure from a device taken as prototype and described in the IZMERITEL'NAYA TEKHNIKA J. (Measuring Equipment), No.8, 1970, pp.78-81. The prototype device is intended to determine properties of various fluid media and comprises a casing provided with current lead-outs, an oscillator secured to a holder, fastening elements, means for pressing the fastening elements to the oscillator, surface electrodes connected to the current lead-outs, a unit for excitation of oscillations, and a unit for recording and processing signals. In the prototype device, the fastening elements of the oscillator are made in the form of filaments or knives pressed by flat springs against the lateral surface of the oscillator, or in the form of needles pressed against its axial ends. When needle-like fasteners are used, there arises friction between the oscillator surfaces and the needles, whereas when knife-like or filament-like fasteners are used, there takes place an inaccurate displacement of a line corresponding to zero mechanical vibrations and also displacement of a knife blade or filament holding the oscillator. The prototype device suffer from a number of limitations inherent in it: in the first place, it is difficult to adapt the process of its assembly and tuning to commercial-scale flow-line production conditions, since the non-perpendicularity of knives or non-coaxiali
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Asoyan Karen Vartgesovich
Belonenko Vladimir Nikolaevich
Makeev Boris Vasilievich
Morozov Mikhail Alexeevich
Sarvazyan Armen Paruirovich
Nath Gary M.
Politzer Jay L.
Vserossiisky Nauchno-Issledovatelsky Institut Prirodnykh Gazoy I
Williams Hezron E.
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