20 February 2022

This VCS is intended for gathering and transportation of low-pressure associated petroleum gas with inlet pressure close to the vacuum.

Since January 2017, the ENERGAS vacuum compressor stations have been ensuring the maximum possible rational use of low-pressure associated gas at the preliminary water removal unit No.3 (PWRU-3) of the Sovietskoye field of OJSC Tomskneft.



VCSs is made on the basis of screw oil-filled compressor. Process unit compresses APG 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. According to the project requirements, the vacuum CS operates at minimum capacity – 250 m3 / h. The gas flow rate is controlled by a two-level regulation system.

Issues that complicate the process of low-pressure APG compression are taken into account here. This is the need for additional associated gas purification, risk of condensate dropout inside the gas system, negative impact of very low inlet pressure, changes of the source gas characteristics. Therefore, technological problem of APG pumping is solved on the basis of a set of special 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 unit's block-module.



At the design stage, a theoretical model of gas behavior under certain conditions (temperature and pressure) was created through a detailed analysis of the component composition of the gas and calculations in special software. This model was used to determine the optimal parameters of temperature of oil and gas, which allow operating processes runs in the gas circuit of the VCS outside the condensation zone.

In the oil system of unit are used special lubricants with higher viscosity and high resistance to saturation from the heavy hydrocarbons. Taking into account the extremely low gas pressure at the suction, the compressor station is equipped with a system of quick-acting valves, which allows you to "cut off" intake pipeline from the trunk pipeline and to prevent release of oil from the oil system into inlet filter-scrubber (back draft).

VCS was designed and manufactured taking into account the climatic conditions of the region and is aimed for intensive operation. Special alloys and anti-corrosion materials were used in the production. It was performed redundancy of some components and assemblies. Block-modular unit is housed in its own all-weather shelter, is equipped with life support and safety systems as well as automated control system. Operation mode as part of PWRU-3 is uninterrupted with scheduled shutdowns for maintenance.

Since July 2015, the similar ENERGAS VCSs have been operating at three more Tomskneft facilities: PWRU-9 of Sovietskoye field, PWRU-4 and PWRU-5 of Vakhskoye field. In total, at the production sites of the enterprise, low-pressure APG is pumped by nine vacuum compressor stations.



REFERENCE:

The Sovietskoye oil field of Tomskneft is located on the border of the Tomsk Region and the Khanty-Mansi Autonomous Area of the Tyumen Region. The oldest and largest field in the Tomsk region is celebrating its 60th anniversary this year. The field remains one of the main assets of the company – production, geological and technical activities, and drilling of new wells are still being carried out here.

JSC Tomskneft VNK produces oil and gas at 32 licensed sites in the Tomsk Region and the Khanty-Mansi Autonomous Area, as well as at three sites of Rosneft Oil Company as an operator. Among the most significant fields are Nizhnevartovsk, Strezhevskoye, Vakhskoye, Luginetskoye, Olenye, Sovietskoye, Krapivinskoye, Dvurechenskoye, Igolsko-Talovoye, Pervomaiskoye.

Previous news

Back to the list

Next news