Tengizchevroil
A Kazakhstan-based oil joint venture that develops the Tengiz and Korolevskoye fields.
Last updated August 31, 2026
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Overview
Tengizchevroil LLP, commonly abbreviated as TCO, is a Kazakhstan-based oil joint venture formed in April 1993 after the government of Kazakhstan granted the consortium exclusive 40-year rights to develop the Tengiz and Korolevskoye oil fields in the north-eastern Caspian region. Tengiz is one of the world’s major oil fields and has been central to Kazakhstan’s emergence as a significant crude-oil-producing country. The venture began as a partnership between Chevron and Kazakhstan’s state oil company KazakhOil, the predecessor of KazMunayGas. It later expanded into a four-party ownership structure. ExxonMobil Kazakhstan Ventures acquired a 25% interest in 1996, while LukArco, a joint venture between Lukoil and Atlantic Richfield Company, acquired 5% in 1997. Following BP’s merger with ARCO, BP became involved indirectly through LukArco. BP subsequently sold its interest in LukArco to Lukoil in December 2009, leaving Lukoil as the sole owner of that 5% position. TCO’s principal business is the extraction, processing, and sale of crude oil from the Tengiz and Korolevskoye fields. Its output is connected to international export infrastructure, making the company strategically important both to Kazakhstan’s energy sector and to the global oil supply chain. In addition to crude oil, the operation produces associated natural gas and sulfur-related by-products as part of field processing, although crude oil remains the core commercial product. Production expanded substantially during the company’s operating history. TCO reported production of 24.2 million tonnes in 2013 and 27.1 million tonnes in 2014. The company reported production of approximately 30 million tonnes in 2019. These figures illustrate the scale reached by the venture, although they are historical production figures rather than a current operating forecast. TCO is also a major employer and local economic institution in western Kazakhstan. In 2019, the company was reported to employ around 4,000 people, approximately 95% of whom were residents of Kazakhstan. Its presence is concentrated around Atyrau and the Tengiz field, while its commercial reach extends through export channels serving international crude markets. The ownership structure combines international oil companies with Kazakhstan’s national energy company. Chevron is the controlling participant, ExxonMobil is the second-largest shareholder, KazMunayGas represents the Kazakh state’s interest, and Lukoil holds the remaining minority stake. TCO is therefore neither a listed public company nor a conventional consumer-facing brand; it is an operating energy venture established under a long-term field-development agreement. Its identity is closely associated with the Tengiz field, Kazakhstan’s petroleum industry, and the participation of major international oil companies.
History
Tengizchevroil was established in April 1993 when the government of Kazakhstan granted the newly formed joint venture exclusive 40-year rights to develop the Tengiz and Korolevskoye oil fields. The fields are located in the north-eastern reaches of the Caspian Sea region and became foundational assets in Kazakhstan’s post-Soviet petroleum industry. The original venture brought together Chevron and KazakhOil, Kazakhstan’s state oil company at the time. KazakhOil was later succeeded by KazMunayGas, which continues to represent the Kazakh state’s participation. The arrangement gave Chevron a leading role in developing Tengiz while preserving a direct national interest in the fields. TCO’s ownership broadened during 1996 and 1997. ExxonMobil Kazakhstan Ventures, an ExxonMobil subsidiary, acquired a 25% share in 1996. LukArco acquired a 5% interest in 1997. LukArco was a joint venture between Lukoil and Atlantic Richfield Company, commonly known as ARCO. This transformed TCO from a two-company partnership into a four-party international consortium. BP became indirectly involved in the structure after its merger with ARCO in 2000. BP held a 46% interest in LukArco, which in turn owned the 5% TCO position. This indirect participation did not replace the principal TCO ownership interests held by Chevron, ExxonMobil, and Kazakhstan’s national oil company. In December 2009, BP sold its interest in LukArco to Lukoil. Lukoil thereafter became the sole owner of LukArco and retained the consortium’s 5% TCO interest. The company’s central activity has been the large-scale development and operation of the Tengiz field, together with the Korolevskoye field. Its operations include producing and processing crude oil, handling associated gas, and managing by-products generated during petroleum processing. TCO’s output is marketed into international oil channels, giving the venture importance beyond its local operating area. Production expanded over time as field development and processing capacity grew. TCO reported output of 24.2 million tonnes in 2013 and 27.1 million tonnes in 2014. In 2019, it reported production of approximately 30 million tonnes. The company also reported approximately 4,000 employees in 2019, with about 95% being residents of Kazakhstan. These figures underscore TCO’s role as both a major industrial operator and a significant employer in the Atyrau region. The venture’s broader strategic context continued to evolve in the late 2010s. In 2019, BP expressed interest in renewed participation in Kazakhstan and signed a memorandum of understanding with KazMunayGas. In 2020, BP and KazMunayGas signed an agreement establishing a partnership to explore for hydrocarbons in Kazakhstan. These developments reflected renewed interest in Kazakhstan’s upstream resources, but they did not alter TCO’s reported ownership structure. Tengizchevroil remains an unlisted operating joint venture rather than a separately traded public corporation. Its brand is principally associated with the Tengiz field, Kazakhstan’s oil-export economy, and the collaboration of Chevron, ExxonMobil, KazMunayGas, and Lukoil.
- 2020
BP and KazMunayGas establish an exploration partnership
[1]BP and KazMunayGas sign an agreement to establish a partnership for hydrocarbon exploration in Kazakhstan.
- 2019
Production reaches approximately 30 million tonnes
[1]TCO reports approximately 30 million tonnes of production and around 4,000 employees.
- 2014
Reported production reaches 27.1 million tonnes
[1]TCO reports production of 27.1 million tonnes, compared with 24.2 million tonnes in the preceding reported period.
- 2009
Lukoil becomes sole owner of LukArco
[1]BP sells its interest in LukArco to Lukoil, which thereafter controls LukArco’s 5% TCO position.
- 2000
BP becomes indirectly involved through LukArco
[1]BP’s merger with ARCO gives it a 46% interest in LukArco and indirect exposure to LukArco’s TCO stake.
- 1997
LukArco acquires a minority interest
[1]LukArco, the Lukoil–ARCO joint venture, acquires a 5% TCO interest.
- 1996
ExxonMobil joins the consortium
[1]ExxonMobil Kazakhstan Ventures acquires a 25% interest in TCO.
- 1993
Tengizchevroil is formed
[1]Kazakhstan grants TCO exclusive 40-year rights to develop the Tengiz and Korolevskoye oil fields.
Products and positioning
A major Kazakhstan oil producer and strategic international joint venture focused on large-scale upstream production in the Caspian region.
Upstream oil production · 1993
Crude oil
Crude oil is TCO’s principal commercial product. It is extracted from the Tengiz and Korolevskoye fields, processed through the company’s field operations, and supplied into export channels serving international petroleum markets. Production growth has made TCO one of Kazakhstan’s most important oil-producing ventures.
Natural-gas production · 1993
Associated natural gas
Natural gas is produced alongside crude oil during field operations. It is an associated output of hydrocarbon extraction rather than the venture’s primary market identity. TCO’s gas handling and processing activities form part of the integrated operation supporting production from the Tengiz and Korolevskoye fields.
Oil-processing by-products · 1993
Sulfur and processing by-products
Sulfur and other processing-related by-products arise from the treatment of produced hydrocarbons. They are secondary to TCO’s crude-oil business but are part of the material flows associated with large-scale sour-crude production and processing.
Brand decisions
2009
Transfer BP’s indirect LukArco interest to LukoilM&ABackground
BP held an indirect interest in TCO through its post-merger ownership position in LukArco.
Action taken
BP sold its interest in LukArco to Lukoil.
Aftermath
Lukoil became the sole shareholder of LukArco and retained the 5% TCO interest.
1997
Add LukArco as a minority participantM&ABackground
The consortium continued to broaden its international ownership base.
Action taken
LukArco, a joint venture between Lukoil and ARCO, acquired a 5% TCO interest.
Aftermath
TCO reached the four-party ownership structure that later continued through changes in LukArco’s indirect ownership.
1996
Add ExxonMobil Kazakhstan Ventures to the consortiumM&ABackground
TCO’s original two-party structure was expanded to bring in another major international oil company.
Action taken
ExxonMobil Kazakhstan Ventures acquired a 25% interest in TCO.
Aftermath
ExxonMobil became the second-largest participant in the venture.
1993
Adopt a long-term field-development joint-venture structureStrategyBackground
Kazakhstan sought to develop the Tengiz and Korolevskoye fields with international technical and capital participation while retaining a national ownership interest.
Action taken
The government granted TCO exclusive 40-year development rights and established a partnership initially involving Chevron and KazakhOil.
Aftermath
The arrangement became the foundation for one of Kazakhstan’s largest oil-producing operations and later expanded to include ExxonMobil and Lukoil.
Sources2 sources
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