Water use

Our goal is to conserve and rationally use water resources. KPO regulates the use of clean water through implementation of the set of measures for water resources conservation, and re-use of treated water, wherever possible.

In 2018, the total water consumption in the Company amounted to 515,141 m3, of which 420,777 m3 was the technical water and 94,364 m3 was the potable water.

KPO water consumption, 2016-2018

The source of water used by KPO for technical needs is Konchubai gully as specified in the Special Water Use Permit for industrial needs that sets water intake limits. In this case, KPO is a primary water user. The water intake from other sources, such as Zharsuat, Serebryakovskiy and Kigach water intake facilities, is ensured though contracts with potable water suppliers. In such cases, the Company is a secondary user.

Table below shows KPO’s water consumption broken down by sources.

KPO water consumption in 2016-2018 by sources, m3

No.

Source

Facility

Water quality

Consumption

2016

2017

2018

1

Zharsuat water intake facility

KOGCF

groundwater, potable

88,415 89,034 92,888
 

Domestic needs

    88,415 89,034 92,888

2

Serebryakovskiy water intake facility

Bolshoi Chagan OPS

groundwater, potable

1,670 1,656 1,476
 

Domestic needs

    1,165 931 980
 

Production needs

    505 725 496

3

Konchubai gully water pond

KOGCF

surface water, technical

374,956 445,591 417,232
 

Production needs

    374,956 445,591 417,232

4

Kigach water intake facility

Atyrau OPS

surface water, technical

3,898 2,183 3,545
 

Domestic needs

    1,053 1,054 933
 

Production needs

    2,845 1,129 2,612

Domestic water

The sources for KPO domestic water supply are Zharsuat water intake — at the Karachaganak field, Serebriakovskiy water intake — in the Bolshoi Chagan OPS, and Kigach water intake — at the Atyrau Terminal OPS. The water intake is ensured through contracts with potable water suppliers. In such cases, KPO is the secondary water user.

The potable water is used exclusively for domestic needs of the KPO facilities. At the Bolshoi Chagan OPS the potable water is supplied by the RSE KazVodKhoz WKO Branch and, due to absence of alternative sources of water supply, is used only to replenish the fire tanks for fire safety purposes.

In 2018, the volume of water consumption for KPО domestic needs totalled 94,801 m3, which was 4% higher compared to the water consumption in 2017 (91,019 m3).

Water is accounted at the facilities by means of water metering devices and is recorded in the logbooks according to the RoK primary accounting rules.

Technical water

The main source of water supply for technical needs in the Karachaganak field is a holding pond No.1 at the Konchubai gully. As per the Special Water Use Permit for water intake for industrial needs valid until 22.09.2020, the annual intake limit is 595,047 m3. The total volume of water intake from the Konchubai gully in 2018 amounted to 417,232 m3. In this case, KPO is the primary water user.

The Konchubai gully is not included in the list of local fishery water bodies, neither fed by ground water; it is replenished only during spring by melting snow and rainfalls.

The Kigach water intake facility supplies the Atyrau Terminal Oil Pumping Station (OPS) with technical water via the Astrakhan — Mangyshlak trunk pipeline, where it is used for domestic and technical purposes.

Reuse of treated wastewater

In order to reduce fresh water intake for such works and operations like drilling, making of drilling muds, watering of planted trees, dust suppression on roads and constructed sites, KPO uses treated domestic, industrial wastewater and storm runoffs. The wastewater is reused at the Company facilities in line with the 2018-2022 Operating Procedure.

The volume of treated technical water reused by KPO in 2018 amounted to 4.4 % of the technical water consumed from the Konchubai gully. Table below shows the KPO activities that utilize treated wastewater.

Reuse of treated wastewater in 2016-2018, m3

 

2016

2017

2018

The total volume of re-used treated wastewater, including:

48,023

50,476

18,241

For drilling and drilling mud preparation

30,655

32,130

8, 825

Irrigation, hydro tests, and replenishing of fire tanks

1,553

6,506

1,040

Dust suppression

15,815

11,840

8,376

In 2018, the Company reused 18,241 m3 of treated wastewater for technical needs, mostly for making drilling mud. Compared to 2017, the reuse of treated wastewater in 2018 was reduced due to one drilling rig operation shutdown and, accordingly, a decrease in wastewater use for the drilling needs.

Discharge of treated wastewater

KPO strives to optimize the use of clean water at the enterprise through implementation of a set of measures for water resources conservation, and re-use of treated water, wherever possible.

Once used for production or domestic needs, water obtains additional impurities that change its primary composition or physical properties, and it turns to wastewater. Water running from industrial facilities during atmospheric precipitation and water produced along with hydrocarbons are also considered as wastewater.

The table below shows the amount of contaminants discharged with wastewater in the period of 2016-2018.

Facility

Limit, tonnes

Actual, tonnes

2016

2017

2018

2016

2017

2018

KOGCF

57,272.71 57,274.87 76,796.183 17,094.78 32,930.47 42,277.12

Bolshoi Chagan OPS

3.66 3.66 3.66 0.99 1.23 1.72

Atyrau OPS

2.37 2.37 2.37 0.85 1.36 1.19

TOTAL:

57,278.74 57,280.9 76,802.213 17,096.62 32,933.06 42,280.03

KPO uses special man-made facilities for collecting treated domestic and industrial wastewater and storm runoffs shown in table below. These facilities exclude a possibility of contaminants soaking into the soil and reaching groundwater as well as allow collecting the treated wastewater for their re-use for technical needs, thereby reducing the fresh water intake.

KPO wastewater collection facilities

Formation water, produced with crude hydrocarbons, and process wastewater are treated and injected into the deep-lying formations of the KOGCF industrial wastewater burial sites 1 and 2. Wastewater injection is the international practice of disposing wastewater, avoiding the formation of salt-containing waste on the surface during the treatment. Due to the reliable water shutoff and soil properties, which are ideal for the injection of wastewater, the migration of wastewater into upper aquifers is ruled out.

Wastewater generated as a result of the KPO economic and production activities is not discharged into the natural water bodies.
Table below shows the KPO 2016-2018 discharge volumes indicating wastewater types and receiving facilities.

Total discharge volume with the indication of wastewater types and receiving facilities, m3

Receiving facility

Type of wastewater

2016

2017

2018

Holding ponds

Treated domestic wastewater

62,767

63,935

68,752

Wastewater subsurface disposal sites

Industrial wastewater, process and associated formation wastewater

413,399

582,400

663,706

Terrain of Bolshoi Chagan and Atyrau Terminal OPSs

Rainfall and snow melt wastewater

5,543

2,862

2,694

Total discharge volume

481,709

649,197

735,152

In 2018, the volume of discharged wastewater increased by 11.6% as compared to 2017. In 2018, the volume of injected industrial wastewater increased by 12.3% as compared to 2017. The increase in industrial wastewater results from the increase of formation water volume appeared because of the high water cut in producing wells. The increase in contaminants is due to both increase of formation water volume and high concentration of soluble salts in the associated water produced with hydrocarbons as well as in wastewater re-injected into the formation.KPO monitors the content of contaminants in generated and treated wastewater at its facilities, such as:

In 2018, the discharge of contaminants amounted to 42,280.03 tonnes, which was 1.3 times higher compared to 2017 — 32,933.06 tonnes. Of them, 39,695.33 tonnes were discharged within the MPD limits, while the excess discharge amounted to 2,584.70 tonnes. The excess discharge of contaminants results from the exceeded MPD concentration in the I quarter on ammonium nitrogen, sulphates and chlorides contained in domestic wastewater discharged into the holding ponds. The injected wastewater contained excessive MPD concentrations in Quarter 3 mainly on suspended solids in Polygon No.1.

The increased volume of industrial wastewater at the Industrial wastewater injection site 1 resulted in the exceeded annual MPD limits of suspended solids, oil products, hydrogen sulphide, aluminium, zinc, sulphates and chlorides, and in excessive discharges. As provided by the RoK Tax Legislation, the Company effected necessary payments for the exceeded discharges of contaminants.

In general, wastewater injection has no effect on the environmental components such as soil, flora and fauna, as wastewater is injected into effectively isolated deep horizons with high-mineralized groundwater that is not used for domestic and potable, balneological, process needs, irrigation or livestock farming. The industrial wastewater is pumped into the Permo-Triassic oversaline deposits. The depth of the wastewater subsurface disposal site № 1 is 2001 m, the depth of the wastewater subsurface disposal site № 2 — up to 2900 m.