RU2250128C2 - Separator for petroleum accounting devices - Google Patents

Abstract

FIELD: oil-producing industry; separators of petroleum accounting devices.

SUBSTANCE: the invention presents a separator for petroleum accounting devices, it is dealt with the field of oil-producing industry and may be used at boreholes, booster pumping stations and other facilities. The separator contains a horizontal container with an inlet connection pipe and an outlet connection pipe of production of boreholes. Inside the container there is a partition dividing it into two parts and an outflow shelf. The height of the partition is equal to the internal radius of the container and divides it into a measuring part and a technological part. The separator is supplied with the second partition installed in the technological part of the container with a clearance between its lower edge and the bottom of the container. The area of the cross-section of the clearance and the area of the cross-section between the two partitions is more than a cross-sectional area of the connecting pipe for withdrawal of petroleum. The technical result consists in improvement of quality of separation.

EFFECT: the invention ensures improvement of quality of petroleum separation.

3 cl, 1 dwg

Description

The invention relates to a device for the separation of crude oil in oil metering units and can be used in wells, booster pumping stations and other installations.

Known separator for oil metering systems, including tank, drain shelf. (Separator AGZU (Automated group metering units) of the “Sputnik-A” type).

The closest device of the same purpose to the claimed invention in terms of features is a separator, including a horizontal tank, inside which a partition is installed, dividing it into two parts, a drain shelf (ed. Certificate of the USSR No. 1318246, class B 01 D 19/00 , 1987) - adopted as a prototype.

The reasons that impede the achievement of the technical result indicated below taken as a prototype include the fact that the known separator has unstable separation conditions due to cyclical fluctuations in the liquid level and pressure, which worsens the separation conditions and promotes the entrainment of free gas bubbles by oil.

The technical result is an improvement in the quality of separation.

The specified technical result during the implementation of the invention is achieved by the fact that in the known separator, including a horizontal tank with inlet and outlet pipes of well products, inside which a partition is installed that separates it into two parts, a drain shelf, the height of the partition is equal to the inner radius of the tank and divides it into a measuring and technological parts, the separator is also equipped with a second partition installed in the technological part of the tank with a gap between its lower edge and the bottom of the tank, area section and whose cross-sectional area between two baffles larger cross sectional area of the nozzle for withdrawal of oil at 20-25%, and the height of the second partition wall is at least 1.1 times the inner radius of the container.

To reduce the resistance to liquid overflow from the separation part to the measuring one and to ensure a sufficient evaporation mirror in the separation part, the second partition has a clearance between the bottom of the tank and its lower edge, which is positioned so that the cross-sectional area between the two partitions at the level of the lower edge of the second partition is larger than the area the cross section of the pipe for oil output by 20-25%, and the height of the second partition is not less than 1.1 of the internal radius of the tank.

This embodiment of the separator provides stable separation conditions, almost complete gas evolution from oil.

The drawing shows a separator for oil metering installations - general view.

The separator includes a horizontal tank 1 with inlet and outlet nozzles of well products, inside of which a partition 2 is installed, the height of which is equal to the inner radius of the tank and divides it into technological 3 and measuring 4 parts, a drain shelf 5, a second partition 6 installed in the technological part of the tank with clearance between its lower edge and the bottom of the tank, the cross-sectional area of which and the cross-sectional area between the two partitions is greater than the cross-sectional area of the pipe for oil output by 20-25%, the height of the second burn subcontroller is at least 1.1 times the inner radius of the container. The separator also contains a level 7 regulator located in the measuring part of the tank, a shut-off valve 8, a meter 9 at the oil outlet, a differential pressure regulator 10, a spray catcher 11 installed on the gas outlet pipe.

The separator works as follows.

Well production enters the separator through the inlet pipe (see drawing) and flows down the inclined drain shelf 5 to the opposite end of the tank 1 and slowly flows through the technological (separation) part 3, in which the final separation occurs - gas bubbles are released.

The efficiency of the final separation depends on the residence time of the oil in the tank 1 (which in turn is determined by the volume of oil in the separation part 3 and the oil flow through the separator) and the size of the evaporation mirror (oil surface). The oil level in the separation part 3, therefore, the volume of oil in it, the residence time of the oil in the separator and the largest evaporation mirror are provided by the height of the partition 2 equal to the radius of the tank.

When the oil level in the separation part 3 reaches the upper edge of the partition 2, the oil begins to flow through the lumen and the upper edge of the partition 2 into the measuring part 4. Due to the height of the partition 6 is not less than 1.1 radius of the tank, from the separation part 3 to the measuring Part 4 flows only the lower layers of oil, completely freed from gas bubbles.

The liquid from the separation part is taken continuously or cyclically. When cyclic selection to achieve a given upper oil level in the measuring part 4 under the influence of the level 7 and differential pressure regulator 10 begins the selection of oil (gas extrusion, or pumping the pump) from the measuring part 4 through the counter 9 (metering unit of oil) to measure the volume and mass of oil. At the same time, the flow of oil from the separation part 3 to the measuring section 4 continues. The selection of oil is stopped when the predetermined lower level in the measuring section is reached under the influence of the level controller 7. Then, the filling of the measuring section starts again and the cycle repeats.

During the cyclic selection of oil from the separator, its separation part 3 always maintains the same level with the largest evaporation mirror, low speed, and maximum oil residence time in the separator.

Due to the most favorable conditions of separation and flowing into the measuring part 4 of the separator of the lower fully separated layers of oil from the separation part, the indication of free gas into the selected oil is excluded, and the accuracy of measuring the volume and mass of oil is increased.

Claims (3)

1. A separator for oil metering installations, including a horizontal tank, with inlet and outlet pipes for well products, inside which a partition is installed that separates it into two parts, a drain shelf, characterized in that the height of the partition is equal to the inner radius of the tank and divides it into a measuring and technological part, the separator is also equipped with a second partition installed in the technological part of the tank with a gap between its lower edge and the bottom of the tank. 2. The separator according to claim 1, characterized in that the cross-sectional area of the lumen and the cross-sectional area between the two partitions is greater than the cross-sectional area of the pipe for oil withdrawal by 20-25%. 3. The separator according to claims 1, 2, characterized in that the height of the second partition is not <1.1 of the internal radius of the tank.