RU2629344C1 - Associated oil gas compression plant - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: presented plant includes a compressor, a fractionator with dephlegmator and stripping sections, and is connected to oil preparation plant. In the course of plant operation, associated oil gas from oil preparation plant is compressed in the compressor and fed between the sections to the fractionator. A first part of prepared oil as absorbent is fed to the upper part of the dephlegmator, and a second part is supplied as coolant to the block of heat-mass-exchange elements of the dephlegmator section and after heating it is returned to the oil preparation plant. Compressed gas is discharged from the top of the fractionator, and condensate is discharged from its bottom to the oil preparation plant. Crude oil is supplied to the oil preparation plant, and water and prepared oil are taken out. In the distillation section, a part of the compressed gas is supplied as a heat carrier after the compressor.

EFFECT: reduction of losses of heavy components with compressed gas and increase in oil yield.

3 cl, 1 dwg

Description

The invention relates to devices for compressing multicomponent gases, in particular associated petroleum gas, and can be used in the oil and gas industry.

The compressor unit is known and widely used [Dronin A.P., Pugach I.A. The technology of separation of hydrocarbon gases. M .: Chemistry, 1976, p. 31], including a compressor, a refrigerator and a separator equipped with lines for the discharge of compressed gas and unstable condensate.

The disadvantages of the known installation are the loss of heavy components with compressed gas at low compression pressure and the loss of light components of gas with condensate at high compression pressure.

Closest to the technical nature of the claimed invention, a method of compressing gas [RU 2524790, publ. 08/10/2014, IPC F25J 3/00], carried out at a plant including a compressor, a stabilizer and a reflux condenser, equipped with heat and mass transfer elements located on the compressor supply line and the supply line of the mixture of chilled compress with stabilization gas, respectively, and equipped with the first - condensate discharge line, and the second - compressed gas.

The disadvantages of this installation are the large losses of heavy components with compressed gas due to the impossibility of deep cooling of the compressor during reflux due to the formation of gas hydrates at high compression pressure, which also leads to a decrease in oil yield. At low compression pressures, deep cooling of the compress is not used due to high capital costs.

The objective of the invention is to reduce the loss of heavy components with compressed gas and increase the yield of oil.

The technical result is to reduce the loss of heavy components with compressed gas by equipping the reflux condenser with the prepared oil supply lines as absorbent and refrigerant and increasing the oil yield by connecting the unit to the oil treatment unit with a condensate discharge line.

The technical result is achieved by the fact that in the proposed installation, which includes a compressor, a stabilizer located on the compressor supply line and equipped with a condensate discharge line, and a reflux condenser equipped with a condensate discharge line, equipped with heat and mass transfer elements, the feature is that the stabilizer and the reflux condenser are located in one the casing and form a column apparatus with a stripping section, the block of heat and mass transfer elements of which is connected to the compressed gas supply line from the compressor, and the reflux condenser a country equipped with inlet lines for the first part of the prepared oil as an absorbent and a second part of the prepared oil as a refrigerant, the unit being connected to an oil treatment unit equipped with water and prepared oil outlets, associated gas, condensate and heated second part supply lines prepared oil.

After the compressor, a refrigerator can be installed, which reduces the temperature of the condensate, and the supply line of the heated second part of the prepared oil can be connected to the output line of the prepared oil, which allows to increase its temperature.

The distant and reflux sections can be, for example, film mass transfer devices, and any devices of the corresponding purpose known from the prior art can be used as an oil treatment unit and compressor. The consumption of the first and second parts of the prepared oil depends on the chemical composition of oil and gas, temperature and pressure conditions of oil preparation and are calculated in each case separately.

Equipping the reflux section with the input lines of the first and second parts of the prepared oil as a refrigerant and absorbent allows the absorption of heavy gas components at a negative temperature gradient that arises along the height of the reflux condenser section due to heating of the lower part of the reflux condenser and cooling of the top part of the prepared oil, which creates optimal conditions for the absorption and fractionation of countercurrent flows of gas and oil, and can significantly reduce the loss of heavy components ENTOV compressed gas. The connection of the block of heat and mass transfer elements of the distillation section with the compressed gas supply line from the compressor allows the condensate to stabilize due to the heat of the compressed gas. The connection to the oil treatment unit allows to increase the oil yield due to the return of heavy gas components to the oil preparation stage.

The proposed installation includes a compressor 1, a fractionating apparatus 2 with a reflux condenser 3 and distant sections 4 and is connected to the oil treatment unit 5. During operation of the installation, associated petroleum gas coming through line 6 from installation 5 is compressed in the compressor 1 and fed into the apparatus 2 between sections 3 and 4. The first part of the prepared oil as an absorbent is supplied to the upper part of section 3 through line 7 from line 8, and its second part is fed through line 9 as a refrigerant to the block of heat and mass transfer elements of section 3 and after heating is returned to the mouth Line 5 or line 8 (indicated by a dotted line). Compressed gas is discharged from the top of apparatus 2 through line 10, and condensate is removed from the bottom of line 11 to unit 5 after stabilization in section 4 due to heating with a part of the compressed gas supplied from line 6. Crude oil is supplied to unit 5 through line 12, line 13 displays the separated water, and line 8 - prepared oil. The placement of the refrigerator on line 6 after the compressor is conditionally not shown.

Thus, the proposed installation can reduce the loss of heavy components with compressed gas, increase oil yield and can be used in the oil and gas industry.

Claims (3)

1. Associated petroleum gas compression unit, comprising a compressor, a stabilizer located on the compressor supply line and equipped with a condensate discharge line, and a reflux condenser equipped with a condensate discharge line, equipped with heat and mass transfer elements, characterized in that the stabilizer and the reflux condenser are placed in one housing and form a column apparatus with a distant section, the block of heat and mass transfer elements of which is connected to the compressed gas supply line from the compressor, and a reflux section, which is equipped input lines of the first part of the oil prepared as absorbent and the second part of the oil prepared as a refrigerant, wherein the plant is connected to the oil treatment plant, equipped with a water output line and the prepared oil supply lines associated gas, condensate and the heated second portion of the prepared oil. 2. Installation according to claim 1, characterized in that a refrigerator is installed after the compressor. 3. Installation according to claim 1, characterized in that the supply line of the heated second part of the prepared oil is connected to the output line of the prepared oil.

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