SU1469313A1 - Device for investigating pvt-ratios of fluids - Google Patents

Abstract

The invention relates to the study of PVT ratios. The aim of the invention is to improve the reliability of the device. A sample of fluid through the valve is fed into the over-piston cavity of the working chamber. In this case, the piston moves downward when the valve is open. The number of samples is determined by the movement of the pointer on the rod along the measuring scale. After feeding the sample into the working chamber, the valve is closed. Press the sample up to a predetermined pressure by means of a pump. Then the valve is closed, and the working chamber is thermostatted with a thermostat at a given temperature. Dp bring samples. The equilibrium state includes a pump with a reversible device, as a result, the working agent is supplied through a flexible communication line into the cavity of the rod, and through it into the bore. At the same time, the working agent acts on the additional piston, which pushes a part of the sample out of the bore through the radial grooves and on the inclined channel-expansion channels in the piston hole. Fluid samples are investigated by changing three parameters (in any combination): pressure (by means of a pump), temperature (by means of a thermostat) and volume (by means of a sensor), i.e. at different PVT-ratios of the current, whose environment. 2 Il. CO 4 bi U9 CO co

Description

The invention relates to equipment for the investigation of PVT ratios (P is pressure; V is volume; T is temperature) of fluids: liquids, liquid and gas-liquid mixtures.

The aim of the invention is to increase the reliability of the slave device.

Fig. 1 shows the inventive device for studying PVT-ratios of fluids of J type; in fig. 2 - section A-A (cylindrical cage mating with a piston).

The supply of the piston in its lower part with a hollow rod, hermetically passed through the bottom of the working chamber, provides the possibility of creating

drive to supply the working agent to the device for mixing the fluid sample. Adapting to the working chamber of the measuring scale and supplying the hollow rod (hermetically passed through the bottom of the working chamber) with an indicator allows direct, rather than indirect measurements of the displacement of the piston without any intermediate elements and thus obtaining accurate measurements of changes in the volume of the fluid sample during the studies. The connection of the hollow rod with the pump by a flexible communication line allows the reciprocating movement of the hollow rod, as well as the ability to make direct, rather than indirect measurements of the movement of the piston, i.e. change in fluid sample volume

Providing a pump with a reversing device provides the ability to change the direction of movement of the working agent in a flexible communication line and hollow stem to create a cyclic (or pulsating) effect on the fluid sample in order to mix it. The execution in the piston from the upper end of the axial bore provides the possibility of creating, within the piston dimensions, an additional power cylinder to act on the test sample of the fluid in order to move it. An additional sealed piston in combination with the mentioned features provides the possibility of creating a dynamic cyclic (or pulsating) effect on the sample of fluid under study for its effective mixing. The nature, intensity and strength of the dynamic effect depend only on the choice of the characteristics of the pump and the reversing device. The implementation of radial grooves in the piston face allows the fluid sample portions to be evenly distributed over the cross section of the working chamber.

The installation above the end of the piston of the cylindrical cage, in which inclined multidirectional channels are inserted, communicated through the aforementioned grooves with a bore, allows to ensure effective dynamics of mixing.

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the movement of the fluid sample portions, which, under the pressure of the additional piston, are drawn through the channels, during which intensive mixing of these portions takes place, and taking into account the fact that the channels are inclined and multidirectional, the fluxes extended through the channels are additionally mixed and when exiting the channels as a result of intersection of the mentioned portions, which also intensifies the process of mixing the sample. This effect is further enhanced due to the fact that the effect of the additional piston is cyclic (or pulsating), the nature, intensity and strength of which depends only on the choice of pump characteristics and the reversing device. The described execution of the jV-insertion device minimizes the dead volume in the working chamber of the device to a minimum. .

The device includes a working chamber 1, in which a piston 2 is installed, having a seal 3, the piston in its lower part is provided with a hollow rod 4, hermetically passed through the bottom of the working chamber. A measuring scale 5 is attached to the dynard. The rod 4 is equipped with a pointer 6 and is connected by a flexible communication line 7 to a pump 8 having a reversing device 9. A valve 11 is installed in the housing GO of the working chamber for supplying working fluid to the working chamber 1, for example using the pump 12. In the upper part of the housing 10 of the working chamber, a valve 13 is installed, through which a sample of the investigated fluid is supplied into the over-piston cavity of this chamber. In the housing 10 of the working chamber there is a pressure gauge 1A connected to the working chamber 1. Work The chamber 1 is placed in a thermostatic jacket 15 equipped with a thermometer 16. The thermostatic jacket is connected to the thermostat 17. In the piston 2, an axial bore 18 is hydraulically connected to the cavity of the upper end, and an additional sealed bore 18 is installed in the bore 18. piston 19. At the end of the piston 2, the radial grooves 20 are made;

on the cylindrical holder 21, inclined multidirectional channels 22 are provided thereto communicated through the slots 20 with the bore 18.

The device works as follows.

Through the valve 13, a sample of the test fluid is fed into the above-cavity cavity of the working chamber 1. At the same time, the piston 2 moves downward with the valve 11 open. The amount of fluid transferred into the working chamber is determined by the movement of the pointer: 6 on the rod 4 along the measuring scale 5. After the fluid sample is supplied to the working chamber, the valve 13 is closed. The sample is compressed to a predetermined pressure with porgsha 2c; I soak up pump 12. Then valve 1 1 is closed, and. The working chamber is thermostated with H; thermostat 1 at a given temperature. Dp of bringing the fluid sample into equilibrium in the case of a liquid or gas-liquid mixture study includes a pump 8 with reversible device 9, as a result of which a working agent, such as transformer oil, is fed through a flexible communication line 7 into the cavity of the stem 4, and through it into the bore 18. The working agent acts on the additional piston 19, which pushes a part of the fluid sample from the bore 18 through the radial grooves 20 and inclined multidirectional channels 22 into the over-piston space. In this case, portions of the fluid sample are drawn through the channels, during which intensive mixing of the portions takes place, and since the channels are inclined and multidirectional, the extended portions of the sample are additionally mixed at the exit from the channels and the intersection of the mentioned portions, which further intensifies the process mixing the sample. The presence of the reversing device 9 makes it possible to change the direction of movement of the working agent (additional piston) to create a cyclic (or pulsating) effect on the fluid sample. It also contributes to the intensification of the sample mixing process, and the degree of intensification depends only on the choice of characteristics.

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pump and reversing device. As a result of such dynamics of movement of the additional piston and fluid mixture, the latter effectively mixes up to an equilibrium (;; state in the supra. Piston space of the working chamber 1, which helps to increase the accuracy of the study while eliminating the need for manual rocking of the device, which improves the working conditions and equipment security.

Fluid samples are investigated by changing three parameters (in any combination): pressure P (by means of pump 12), temperature T (by means of thermostat 17) and volume V (by means of piston 2), i.e. wear x fluid. The change in pressure P is measured by a pressure gauge 14, the change in the temperature gauge by a T-thermometer 16, and the change in volume V by means of the pointer 6 connected to the stem 4 and the measuring scale 5. In this case, direct and not indirect measurements of the piston movement are obtained, i.e. . the accuracy of measurements of the change in the volume of the sample is improved;

Thus, the use of the invention improves the reliability of the device, improving working conditions and safety techniques.

Claims (1)

Invention Formula A device for testing PVT-ratios of fluids, containing a working chamber, a compacted piston and its actuator, a device for mixing a fluid sample, a thermostatic jacket and a measuring unit, characterized in that, in order to improve the reliability of the device, the piston at its bottom the parts are provided with a hollow rod, hermetically passed through the bottom of the working chamber, the rod is connected by a flexible communication line to a pump with a reversing device, an axial shaft is made in the piston from the upper end point in fluid communication with the cavity of the rod in the bore of the optional densified piston in an end face of the first piston vtolneny radial-yen kanye inclined oppositely directed grooves on end mounted Qi Nala communicated through said Lindric holder, in which protolpazy with a rast. point. GBH 1 Compiled by V.Filatov Editor T.Parfenova Tehred M.Hodankch. Corrector V.Girn to Order 1347/45 Circulation 788 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk iab., 4/5 Production and publishing plant Patent, Uzhgorod, st. Gagarin, 101 Phys. 1 Subscription