RU2445176C2 - Separating piston of "gas-fluid" media - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to operation main pipelines and serves to separate gas and liquid phases in displacing one medium with the help of another one, and may be used in oil-and-gas industry. Proposed piston comprises hollow case made up of two tubes with elastic cups fitted on tube front and rear. Elastic membrane is fitted between tubes while covers are arranged on tube faces. Note here that holes are made on rear tube cover and front tube cylindrical surface.

EFFECT: decreased mixing of gas with fluid in pumping.

2 dwg

Description

The invention relates to the operation of trunk pipelines and is intended for the separation of gas and liquid media in the process of displacing one of the media using the other, and can be used in the oil and gas industry.

A device for cleaning the inner surface of the pipeline (patent No. 2324550, 05.10.06, IPC BVB 9/055, publ. 05.20.08. Bull. No. 14), containing a hollow body in the form of a pipe with elastic placed on it in front and back cuffs and a bypass valve, and the casing consists of separate pipes of at least two, between which the cuff is placed, and a valve is installed in front of the casing.

A disadvantage of the known device is that by periodically opening the valve, the working medium is mixed with the pushed medium, which leads to a violation of the uniformity of the composition and loss of the pushed medium.

Known piston-separator (see. Catalog "Equipment used in OJSC" AK Transneft "for cleaning the internal cavity of oil pipelines and internal diagnostics" - Moscow, 2009, OJSC TsTD "Diaskan", pp. 12, 13, 14) used for cleaning and the displacement of oil and water under gas pressure from the pipeline, structurally consists of a housing with cleaning discs and sealing cuffs placed on it in front, middle and back.

A disadvantage of the known piston separator is that the separation of the media during pumping or displacement is due to the elasticity of the material of the cleaning discs and sealing cuffs made in the form of discs. As a result, due to the difference in the specific pressures of the media, one of which is working with a specific specific pressure and the other pushed with a lower specific pressure, they are periodically mixed, which leads to an over consumption of the working medium and a change in the composition of the displaced oil product.

The technical result of the proposed technical solution is to eliminate these drawbacks and create a piston-separator design that excludes mixing of various media during pumping and displacement.

The technical result is achieved by the fact that an elastic membrane is mounted between the pipes, and caps are made on the ends of the pipes, and holes are made on the cover of the rear pipe and the cylindrical surface of the front pipe.

The invention is illustrated by drawings;

Figure 1 - device at the beginning of the path;

figure 2 - device at the end of the path.

The gas-liquid medium separator piston contains a hollow body of two pipes 1, 2 with elastic cuffs 3, 4 and 5 placed on it in front and back. An elastic membrane 6 is mounted between the pipes 1 and 2, and on the ends of the pipes 1 and 2, covers 7, 8 are made. Moreover, openings 10 and 11 are made on the cover 7 and the cylindrical surface 9 of the front pipe 2. Cuffs 3 and 4 with working ends 12 and 13 are arranged towards each other.

The piston separator works as follows.

A gas-liquid medium separator piston is introduced into the pipe cavity 14 through a special start-up chamber (not shown), where a technological medium is pumped between cuffs 3 and 4, for example, a pushed oil that enters the pipe cavity 1 and 2 through the hole 11 and presses the bottom of the membrane 6 to the cover 7. The specific pressure of the process medium is adjusted to 0.2 MPa. From the side of the lid 7, a working medium, for example inert gas, is supplied, and from the side of the lid 8 there is a pushed medium, for example, under a specific pressure of 0.2 MPa. When increasing the specific pressure of the working medium, for example, to 0.4 MPa by moving the membrane 6 through the holes 10 and due to the tightness provided by the cuffs, the specific pressure of the process medium also increases to 0.4 MPa. Due to the difference in the specific pressure of the working medium and the specific pressure of the medium being pushed, the piston-separator moves away and moves along the pipe 14. With increasing resistance to the movement of the piston-separator through the pipe 14, due to the increase in the static pressure of the pushed medium, the specific pressure of the working medium increases, and due to this through the holes 10 and the membrane 6 also increases the specific pressure of the process medium. As a result, the cuffs 3 and 4 are pressed against the wall of the pipe 14 with great effort, which ensures tightness. In the process of moving the device through the pipeline 14, part of the technological environment is consumed. The flow rate is compensated by the fact that the working medium through the openings 10 through the membrane 6 through the openings 11 moves the process medium into the cuff zone 3 and 4. As a result, the specific pressure of the working medium maintains the specific pressure of the technological medium. Thus, the process medium serves as a buffer between the membrane and cuffs, which ensures high-quality separation of the two media. In the presence of deposits on the walls of the pipeline, the piston-separator performs cleaning of the internal cavity of the pipeline.

Claims (1)

A gas-liquid medium separator piston comprising a hollow body of two pipes with elastic cuffs placed on it in front and back, characterized in that an elastic membrane is mounted between the pipes and the ends are made on the ends of the pipes, moreover, on the back pipe lid and cylindrical surface of the front pipe holes are made.

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