30 October 2013

At the site of Booster Pump Station No.2 (BPS-2) of Ety-Pur field of JSC Gazpromneft-Noyabrskneftegas, there are successfully completed 72-hour comprehensive testing of a system for recovery of associated petroleum gas of low oil separation stages.

It was also tested ENERGAS vacuum compressor station (VCS), which is the basis of this system.



In the course of testing, the VCS worked out in a routine mode, without any complaints. There has been checked the operability of process, compressor and electrical equipment and automated control system.

VCS performs compressing low-pressure (0.001 MPa) associated gas of the end stage. Compressed APG is injected into the gas transportation system under the pressure 0.7 MPa.

Vacuum CS is made on the basis of oil-filled screw compressor. The rated capacity of the unit is 1,500 m3 / h; gas flow is controlled by a special two-level regulation system.



VCS operates in an automatic mode. Local ACS is integrated with the upper level of APCS of BPS-2.

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 close to the vacuum; 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 unit's oil system 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.

VCS was designed taking into account extreme operating conditions (minimum air temperature – minus 59°C, average temperature of the coldest five-day period – minus 50.5°C). Special alloys and anti-corrosion materials were used in the production. It was performed redundancy of some components and subassemblies of equipment.



Vacuum CS is housed in its own all-weather enclosure; it is equipped with all necessary life support systems (heating, ventilation, and lighting) and safety systems (fire detection, gas detection, alarm, and fire fighting).

All the pre-start activities, including erection supervision, start-up and adjustment works, own and integrated testing of VCS were performed by the company ServicENERGAS (ENERGAS Group). The system for recovery of associated petroleum gas has been commissioned.

REFERENCE. Ety-Pur oil field located in the Yamal-Nenets Autonomous Area near the town Noyabrsk was discovered in 1982. Oil reserves are about 40 million tons; field development started in 2003. Here there is also registered one of the record indicators for the Western Siberia: in early 2007 it was registered gushing oil well with a daily oil rate of 400 tons of oil.

Gazpromneft-NNG is engaged in oil and gas production activities in the Yamal-Nenets and Khanty-Mansi Autonomous Areas. Since the establishment of the enterprise, more than 850 million tons of hydrocarbons in oil equivalent have been extracted. Taking into account the branch of Gazpromneft-Muravlenko, the company develops 28 fields.

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