3 November 2021

As part of the project for arrangement of the Kharasavey field of PJSC Gazprom, a power supply complex has been created here to provide electricity to construction sites. The operating company and the owner of the power supply complex is Allocation Hub LLC.

As the primary source of electric power, packaged gas-reciprocating power plants ROLT are used. GRPPs are made based on the engines of MWM TCG 2020 series (Caterpillar) with a unit capacity of 2.0 and 1.2 MW. The main consumer is a rotational camp for 5,000 people.



The generating facility will also use mobile automated gas-turbine power plants PAES-2500 with a capacity of 2.5 MW each. These PAESs are designed to supply electricity to hydraulic flushing units.

The fuel for power supply complex is natural gas produced at the field. Its design parameters on purity, temperature, pressure and flow are ensured by the ENERGAS fuel gas treatment facility (FGTF). The maximum capacity of the facility is 8,000 m3 / h, including: consumption for GRPP – 5,000 m3 / h, for PAES turbines – 3,000 m3 / h.

FGTF is a multifunctional complex of two modules operating in cascade scheme. Fuel gas treatment module No. 1 (FGTM-1) is made on an open frame and is intended for preliminary separation, filtration and pressure reduction of the incoming gas. FGTM-1 comprises the following process equipment:

- Separator-slugcatcher with a volume of 1 m3;
- Two-stage filter coalescer, purification rate is 99,9% for the particles larger than 5 microns;
- Gas condensate gathering and storage subassembly with 10 m3 underground tank;
- Reduction system (gas pressure at the inlet is 12.7 MPa, at the outlet is 5.45 MPa).



After the first stage of treatment, the fuel gas enters to module No. 2, where the its final purification, flow measurement, heating and additional pressure reduction take place. FGTM-2 is a block-box, that accommodate equipment for various purposes:

- Filtration system with coalescing elements, purification degree is 100% for the liquid fraction and 99.9% for solid particles larger than 3 microns;
- Condensate drainage subassembly with 5 m3 tank;
- Gas commercial metering unit, consisting of measuring and control lines with ultrasonic flow meters;
- Gas heating subassembly with a capacity of 500 kW based on a shell-and-tube heat exchanger;
- Four-line reduction system (gas pressure at the inlet is 5.45 MPa, at the outlet – 0.45 MPa for GRPP and 1.25 MPa for PAES);
- Outlet fuel quality control unit with measuring and analytical equipment.

FGTM-2 is equipped with life support systems and safety systems (fire detection, gas detection, alarm and fire fighting).



Process flow scheme of FGTM-2 includes a packaged boiler room (PBR) with a total useful thermal capacity of 0.6 MW. Integrated PBR prepares intermediate heat carrier for gas heating subassembly and consists of 2 water-heating boilers – working and standby. In addition to the main function, this equipment provides the own needs of the module No. 2 – the generated heat is used to heating its premises.

The boiler room is placed in a separate compartment docked with the main enclosure of the FGTM-2. It is equipped with engineering systems and its own gas supply (fuel treatment) unit with equipment for filtering, pressure reducing and metering of gas.



Fuel gas treatment facility was devised according to individual design and was manufactured taking into account the operating conditions, characteristics of the source gas (composition, quality, delivery volume, pressure, temperature), type and capacity of conjugated gas-consuming units, process tasks, and special project requirements.

FGTF is aimed for intensive operation mode and fully automated. The control system is made based on microprocessor technology, using modern software, switching equipment and communication channels and protocols.

The local ACS is integrated with the upper level of the APCS of power supply complex. It provides remote control of facility, automatic protections and alarm; monitors the process parameters and indoor gas hazard; handles the parameters of the workflows and emergency events; issues information to the operator panel.

The comprehensive commissioning of the FGTF (adjusting, own and integrated tests, training of the operating personnel) was carried out by the specialists of ServicENERGAS, a member of the ENERGAS Group.



REFERENCE:

The Kharasavey gas condensate field is located in the Yamal-Nenets Autonomous Area, mainly on the Yamal Peninsula and partially in the Kara Sea. By the size of gas reserves (2 trillion cubic meters), it belongs to the unique category.

In March 2019, Gazprom began full-scale development of the Cenomanian-Aptian deposits here. The start of production is scheduled for 2023. In the future, it is planned to develop deeper Neocom-Jurassic deposits. The field is being equipped by JSC Gazstroyprom, the sole contractor of Gazprom Group enterprises.

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