16 August 2018

The ENERGAS vacuum compressor stations have passed a three-year milestone of efficient operation at the number of Tomskneft facilities: at the sites of preliminary water removal unit No.9 (PWRU-9) of Sovietskoye field, PWRU-4 and PWRU-5 of Vakhskoye field.



This process equipment provides here rational use of low-pressure APG in the maximum extent possible.

VCSs of screw type compress associated gas of the second separation stage from close to the vacuum pressure (0.001…0.01 MPa) to the gas pressure of the first separation stage (0.6 MPa) for transportation to the gas distribution station and gas compressor station (GCS) "Vakh".

According to the project requirements, the vacuum CSs operate at minimum capacity – 360 m3 / h. The gas flow rate is controlled by a two-level regulation system.

There are several main issues that make low-pressure APG compression process complicated: need for additional associated gas purification; risk of condensate dropout inside the gas system; negative impact of very low inlet pressure; changes of the gas composition; severe operating conditions.

Therefore, this technological task is solved by special projects – on the basis of a set of consistent engineering solutions.



In particular, the gas final purification at the compressor inlet is performed by a highly efficient two-stage filter-scrubber (with a system of automatic drainage) integrated in the process unit's block-module.

At the design stage, there were carried out a detailed analysis of the gas composition and calculations in special software that creates a theoretical model of the behavior of a gas under certain conditions (temperature and pressure). This made it possible to determine the optimal operating temperature parameters of oil and gas, for which compression processes runs out of the condensation zone.

In the oil system of units are used special lubricants with higher viscosity and high resistance to saturation from the heavy hydrocarbons.

Suction line is equipped with quick-acting valves with electric actuators and spring failsafe closing devices, that allows to cut off the compressor station gas circuit from the gas inlet pipeline.

VCSs were designed taking into account extreme operating conditions. Special alloys and anti-corrosion materials were used in the production. It was performed redundancy of some components and subassemblies of equipment.

Packaged VCSs are placed in separate weatherproof shelter; are equipped with life support systems and safety systems as well as automated control system. Operation mode as a part of facilities is continuous.

Since July 2017, the similar vacuum compressor station has been operating as a part of another one Tomskneft facility – PWRU-3 of Sovietskoye field.

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