SU1338903A1 - Method of cleaning pipelines from liquids - Google Patents

Abstract

The invention relates to the oil and gas industry, in particular to methods for cleaning pipelines from liquids without reducing the pressure of the transported medium, and ensures an increase in the reliability of operation when cleaning pipelines with areas of different curvature. The invention consists in that the separator is made of a flexible airtight material, the cavity of which is filled with „KTITD L liquid in the volume V: V t (), where K is the coefficient taking into account the influence of the geometrical parameters of the separator on its filling volume; L is the length of the separator; D is the outer diameter of the separator, equal to the internal diameter of the pipeline; p - the minimum radius of the curve, the separator. 1 silt, 1 tab. (L

Description

The invention relates to the oil and gas industry, in particular to methods for cleaning pipelines having curvilinear portions j from liquids without decreasing the pressure of the transported medium.

The purpose of the invention is to increase the reliability of operation when cleaning pipelines that have curved sections of liquids.

The drawing shows a schematic diagram of the implementation of the proposed method.

The diagram shows a curved section of the pipeline 1 with an internal diameter D and a minimum radius of curvature of. In the pipeline there is a toroidal separator 2 of length L and wall thickness h with a valve 3 for filling it with liquid. The toroidal separator has a volume free from liquid realized by the folds of the shell.

The method of cleaning pipelines from liquids is implemented as follows.

The empty shell of the toroidal separator is placed inside the pipeline 1 at the start-up station of the cleaning devices with the inlet tap open.

The maximum volume of torus filling with a fluid is determined by the maximum radius of curvature of the elastic bend of a straight line pipe p 900. By substituting this radius of curvature into a formula, one obtains

g

Vx

),

0

five

The casing through valve 3 is filled with liquid, the volume of which is calculated by the formula

fD4,4 p + D where K is a coefficient taking into account

the influence of the geometric parameters of the torus on the volume of its filling with liquid; D is the outer diameter of the torus, equal to the internal diameter of the pipeline;

p is the minimum radius of curvature of a torus when it passes through a section of a pipeline that has a minimum radius of curvature. For toroidal devices having different L, S, and B ratios, the K coefficient is determined empirically. The cleaning device is completely filled with liquid and then the measured value. The volume of liquid VJ, Q is divided by the volume of the cylinder describing the torus.

H.

.. l

to

thirty

The results of experiments to determine K for rational L, D, and h ratios are presented in the table.

55

Lennaya, depending on the geometrical parameters of the pipeline, the amount of filling the torus with liquid, less than the total volume. The minimum filling volume of the torus cavity with a fluid is determined by the minimum allowable radius of curvature of the pipeline turning sections.

The outer valve of the launch unit is closed. After the toroidal separator 2 placed in the pipeline, an overpressure is created, under the action of which the toroidal separator moves and turns out. On a curved section of the pipeline, the toroidal separator is rolled by rolling due to the formation of folds on the surface of the toroidal separator adjacent to the pipe wall with a greater curvature.

The method of cleaning pipelines from liquids allows the cleaning of curvilinear sections of pipelines, as well as sections of pipelines with unequal passages. If, due to unforeseen circumstances, an incompletely filled toroidal junction occurs: the separator, then due to the excessive pressure created behind the toroidal separator, it is depressurized, flattened and carried away by the flow of the transported product.

Or O. Yurkvedka 4162/6

Compiled by A.Nikitin Tehred L.Oliynyk

Cor Pod

Circulation. 540 VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

Invention Formula The method of cleaning pipelines from liquids by passing a toroidal separator made of flexible airtight material, the cavity of which is filled with liquid, so that, in order to increase the reliability of operation when cleaning pipelines with areas of different curvature, the toroidal separator is partially filled and the volume of the filled fluid is determined from the ratio   , D / 2 W 4 / Where K - coefficient taking into account the effect of the geometrical parameters of the toroidal separator on the volume of its filling; the length of the toroidal separator; its external diameter equal to the internal diameter of the pipeline; o is the minimum radius of curvature of the toroidal separator as it passes through the pipeline section having the minimum radius of curvature. -) L D Proofreader A.T. sko Subscription