Water Use and Water Discharge Management

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The company’s business is directly focused on water bodies. Three oil and gas producing platforms are installed in the sea of Okhotsk and are connected to onshore facilities through subsea pipelines. The shore pipelines of trans-Sakhalin pipeline system pass through nearly a thousand water bodies. The water that is inevitably polluted when used and which, therefore, should be purified and diverted, is used to support and sustain production facilities. The stormwater that is generated when it rains or snows or when the ice and snow melts should also be purified before it is discharged.

In accordance with legislative requirements, the company runs its water management business in accordance with authorization documents so as to:

  • use the surface areas of water bodies;

  • extract water from surface water bodies;

  • extract water from underground water bodies;

  • discharge sewage waters.

At the production stage, layer water saturated with oil and concomitant chemical compounds also comes to the surface of the soil, along with hydrocarbons. Such water is separated from oil and sand but is not discharged into the sea, instead, it is pumped back into the subsurface soil in order to maintain reservoir pressure. This is a common practice nowadays which is used by the global oil and gas companies, because the use of extremely complex energy intensive technologies is required for produced water treatment purposes.

The company has been keeping instrumental records of abstracted, discharged and disposed water so as to control the impact on water bodies. Constant visual observation of the sea surface has been performed from both the platforms themselves and support vessels across all offshore facilities. Such observations are required to detect accidental leakages and spills so as to take further quick actions.

The wastewaters that are generated at the company assets are divided into three categories: industrial waters, stormwaters, and domestic waters. Waste treatment facilities have been installed to clean wastewaters from pollutants so as to prevent harm to water bodies.

Wastewater quality control is performed before and after wastewater treatment through the waste treatment facilities, before wastewater is discharged to water bodies, and with the involvement of an independent accredited laboratory. Quality control is also performed to monitor the quality of water in water bodies into which the water is discharged and from which the water is extracted. The quality control results allow for further assessment of the effectiveness of waste treatment facilities, assessment of impacts on water bodies and analysis of their state.

The company’s performance in relation to water use is shown in the sustainable development reports.