RU2564255C1 - Associated gas processing facility - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: upstream gas drying unit there is methanation unit equipped with water inlet line and coupled to the drying unit by water condensate delivery line and upstream the methanation unit there is absorbing stripping unit equipped with treated oil delivery line and unstable oil outlet line.

EFFECT: usage of the above invention allows reducing specific amount of metal and power consumption, reducing range of market products and increasing oil yield.

2 cl, 1 dwg

Description

The invention relates to a device for the preparation of associated petroleum gas and can be used in the oil and gas industry.

A known installation for the preparation of hydrocarbon gas [RU 2381822, publ. 02.20.2010, IPC B01D 53/04], which includes a gas compression unit with hydrocarbon condensate and water outlet lines connected to a gas adsorption drying unit, equipped with lines for supplying and discharging cooling gas, regeneration gas and dried gas, and regeneration and preparation units for waste gas regeneration, low-temperature gas processing unit and booster compressor.

Disadvantages of the known device is the complexity, high metal consumption and power consumption, large losses of hydrocarbons with C ₄₊ hydrocarbon condensate gas compression unit.

Closest to the technical nature of the proposed invention is a useful model of a complex preparation of gas and hydrocarbon condensate [RU 137211, publ. 02/10/2014, IPC B01D 53/00], including at least one compression, cooling and separation unit sequentially installed with compressed gas, hydrocarbon condensate and water outlets (lines), equipped with a condensate stabilization column, a gas dehydration unit with a drained outlet gas and gas regeneration and a low-temperature gas processing unit with drains of dried topped gas and a wide fraction of light hydrocarbons.

The disadvantages of this installation are the high metal consumption and energy consumption due to the installation of the unit with a low-temperature gas processing unit, including energy-consuming booster compressor station or refrigeration unit, as well as the production of a wide fraction of light hydrocarbons as a by-product for which there are often no economically feasible transportation solutions .

The task of the invention is to reduce the metal consumption and energy consumption of the installation (station), reduce the range of commercial products, increase the oil yield.

As a technical result is achieved:

- reducing the metal consumption and energy consumption of the station, as well as reducing the number of commercial products by equipping the unit with a methanation unit instead of a low-temperature gas processing unit and a condensate stabilization column,

- an increase in oil output at an oil treatment unit, which is a source of associated petroleum gas, by equipping the station with an absorption topping unit.

The specified technical result is achieved by the fact that in a known installation comprising at least one compression and cooling unit with a compressed gas exhaust line and a drying unit with drained gas and regeneration gas exhaust lines, a feature is that in front of the gas drying unit a methanation unit is installed, which is equipped with a water input line and connected to the drying unit with a water condensate supply line, and an absorption topping unit equipped with a line is installed in front of the methanation unit s prepared feed oil and volatile oil O.

Installing a methanation unit in front of the gas dehydration unit allows you to remove C ₃₊ hydrocarbons from gas and produce gas of the required quality without the use of equipment for low-temperature gas processing and stabilization of condensate. Methane can be carried out, for example, using the technology of soft catalytic steam reforming, due to the conversion of heavy hydrocarbons to methane and carbon dioxide by the reaction: C _n H _{2n + 2} + (0.5n-0.5) Н ₂ О = (0.75n + 0.25) CH ₄ + (0.25n-0.25) CO ₂ .

The installation of an absorption topping unit in front of the methanation unit allows the C ₅₊ hydrocarbons contained in the associated petroleum gas to be returned to the oil preparation stage and thereby increase the yield of the latter.

If it is necessary to increase the concentration of hydrocarbons in the prepared gas between the drying and methanation units, a block of adsorption, absorption or membrane gas after-treatment from impurities (carbon dioxide, hydrogen, etc.) is installed.

The station includes a compressor 1 (one compressor stage is conventionally shown) with a device for cooling and topping 2, a methanation unit 3, a drying unit 4 and, possibly, a gas after-treatment unit 5.

During the operation of the station, associated petroleum gas (I), purified from drip moisture and mechanical impurities, is mixed with regeneration gas (II), compressed by compressor 1, subjected to cooling and topping by absorption with prepared oil (III) supplied, for example, from the end separation stage , in device 2, from which unstable oil (IV) is removed, for example, to the second separation stage, and then fed to methanation unit 3, where, in the presence of water (V) and water condensate (VI), they are subjected to mild catalytic steam reforming. The resulting catalyzate (VII) is dried on block 4 to obtain dry stripped gas (VIII), condensate of water vapor (VI) and regeneration gas (II). At least part of the latter can be used for own needs, for example, as fuel gas (shown by a dotted line). If necessary, the catalyzate (VII) is additionally purified at block 5, for example, of carbon dioxide, and the impurity concentrate (IX), for example, exhaust gas, is used for own needs, for example, as a fuel component for compressor drive.

Thus, the present invention allows to reduce metal consumption and energy consumption, reduce the number of commercial products, increase the yield of oil and can be used in the oil and gas industry.

Claims (2)

1. The associated petroleum gas preparation station, comprising at least one compression and cooling unit in series with a compressed gas exhaust line and a drying unit with drained gas and regeneration gas exhaust lines, characterized in that a methanation unit is installed in front of the gas drying unit, which is equipped with water inlet line and connected to the drying unit with a water condensate supply line, and in front of the methanation unit, an absorption topping unit equipped with prepared oil supply lines and but unstable oil. 2. The associated petroleum gas preparation station according to claim 1, characterized in that a gas after-treatment unit is installed between the drying and methanation units.