RU2315277C1 - Arrangement for selection of deep-laid samples of liquid - Google Patents

Abstract

FIELD: the invention may be used for selection of samples of liquid from a pre-assigned depth of a technological capacity, a natural reservoir in oil producing, petrochemical industries, in depots for storage of oil products and for ecological control of surface sources of water.

SUBSTANCE: the arrangement for selection of deep-laid samples of liquid has a hollow chamber, a valve for accession of liquid and a cable for lowering of the chamber. A non-return valve of the plate type is located in the lower part of the chamber. The upper part of the chamber is connected in-series through a flexible armored hose with a pressure gauge, a gas meter, a three-way cock and a balloon with compressed inert gas. The arrangement allows control over the process of filling of the chamber with selected sample of liquid from a pre-assigned depth.

EFFECT: allows reduce unproductive expenses.

2 dwg

Description

The present invention relates to devices for sampling liquids from a given depth of the technological capacity of a natural reservoir and can be used in the oil and petrochemical industries, on the basis of storage of petroleum products, as well as for environmental monitoring of surface water sources.

A well-known sampler ZAO Ekros, designed for the environmental study of water bodies (RF Patent No. 2090856, IPC ⁷ : G01N 1/10, 1/14). The sampler descends into the water on the same cable with open inlet openings, into which water enters as it descends to a depth. This does not ensure sampling from a given depth.

Known GOST 2517-85, regulating the sampling of oil and oil products from the required depth of the tank. Samplers used in accordance with GOST (Figs. 3, 5, 6) have two communication lines (cables) that require two people to work synchronously.

The aim of the invention is to achieve sampling of a liquid from a given depth of capacity with one communication line, leading to a decrease in the complexity of the sampling process and a simultaneous increase in the representativeness of the selected sample. This goal is achieved in that the device for sampling deep fluid samples containing a hollow cylindrical chamber, a valve for fluid intake and a cable is configured so that a poppet type check valve is located in the lower part of the chamber, the upper part of the chamber is connected in series with a manometer through a flexible reinforced hose , gas meter, three-way valve and a cylinder with compressed inert gas.

A communication line in the form of a reinforced hose with a small bore has two functions: it fixes the body of the sampler at a given depth and is an inert gas conductor, which ensures that the chamber is filled with liquid at the required depth.

Figure 1 presents a General view of the sampling device, and figure 2 shows a horizontal section of the guide sleeve of the check valve.

The device consists of a chamber 1, a check valve 2, a flexible hose 3, a pressure gauge 4, a gas meter 5, a three-way valve 6 and a gas cylinder 7. The operation of the sampling device is based on the opening and closing of valve 2 using inert gas pressure forces and a hydrostatic liquid column when immersing the camera 1 to the required depth. It is also important that the hose 3 is reinforced with a strong mesh frame, due to this it can withstand excessive external and internal pressure. Such a hose does not stretch in length, so if it is tared in length, then it will simultaneously serve as a depth tape measure (metric).

An in-depth sampling device should be used in the following order. On the counter 5, the current gas reading V ₁ , the three-way valve 6 is fixed in the position in which the cylinder 7 is connected to the counter 5. The gas pressure in the chamber 1 with the help of the cylinder 7 and the pressure gauge 4 rises several atmospheres more than the pressure of the liquid column at a depth sampling. In this case, a certain volume of gas V _g will flow through the counter 5, and the meter reading will become equal to V ₁ -V _g (reverse flow and gas readout). The excess gas pressure created in chamber 1 will press the poppet valve itself against the opening of chamber 1, i.e. closes the check valve 2. On the hose 3, an empty and closed chamber 1, under its own weight, descends to a predetermined depth. The faucet 6 is smoothly shifted to the position connecting the hose 3 with atmospheric air. A gas in the volume V _g + V _k , where V _k is the internal volume of the chamber 1, will pass through the counter 5 by direct flow and readout. The gas volume V _k will begin to flow from the chamber 1 into the hose 3 and the counter 5 at the moment when the pressure of the liquid column exceeds the gas pressure in the chamber 1, and under the action of a differential pressure check valve 2 will open.

At the time of filling the chamber 1 with deep fluid, the reading of the counter 5 will be equal to V ₁ -V _g + (V _g + V _k ) = V ₁ + V _k . From these simple calculations, the purpose of counter 5 is obvious: to fix the moment of filling chamber 1 with deep fluid by passing gas displaced from chamber 1 with a volume of V _k through the gas meter.

For the safety of the selected deep liquid sample of volume V _k, it is necessary to close valve 2 again using the same compressed gas from cylinder 7 and valve 6. Chamber 1 is removed from the liquid, the pressure in it drops to atmospheric, and its contents are poured into a convenient dish for further study .

The use of a flexible reinforced hose, compressed gas and gas meter in the proposed device creates a new technical solution - the action of the check valve of chamber 1 is regulated at a distance by one person. The use of a gas meter gives another positive technical effect - the moment of filling the sampling chamber 1 with deep fluid is set visually by the gas meter 5 by adding to the initial current reading of the meter V _{1 the} internal volume of the chamber 1: V _to . This is important in deep wells and technological tanks during the descent and ascent of the sampling device through hatches of small diameter. Such hatches exclude the possibility of visual monitoring of fluid intake into the flexible hose 3 after filling chamber 1. Personnel using well-known designs of sampling devices are forced to judge the filling of the sampling chamber only by experience and viscosity characteristics of the deep fluid. Therefore, in order not to extract a half-empty sampler from the depth, personnel must wait for a time with a certain excess from the calculated one.

Thus, the inert gas from the cylinder 7 also performs two functions: it closes by the force of its pressure, opens the check valve 2 and transmits information about filling the chamber 1 with liquid.

In addition, the proposed device can be used for sampling of sludge and sediment in water bodies or technological deposits in containers. To do this, chamber 1 lowers to the bottom of the tank, the pressure in the chamber decreases sharply to atmospheric, and due to the pressure drop that has arisen, bottom sediments will enter chamber 1.

In the claimed device, there are several significant differences from known analogues:

1. A sample of deep fluid in a convenient mode is taken by one person without unnecessary manipulation.

2. The sampling time is reduced due to tight control of the sampling process and the elimination of time losses waiting for the estimated filling of the sampling chamber.

In our opinion, these positive differences will allow the claimed sampling device to find its application in various industries and in the field of environmental monitoring of water bodies.

Claims (1)

A device for sampling deep liquid samples containing a hollow chamber, a valve for fluid intake and a cable for lowering the chamber, characterized in that the poppet type check valve is located in the lower part of the chamber, and the upper part of the chamber is connected in series through a flexible reinforced hose to a manometer, gas meter , three-way valve and a cylinder with compressed inert gas.

Images