The story
On 1 September 2003, BP and a group of Russian businessmen represented by the AAR Consortium (Alfa-Access-Renova) announced the creation of TNK-BP, a strategic partnership to jointly hold their oil assets in Russia and Ukraine. AAR contributed its holdings in TNK International, ONAKO, Sidanko, Rusia Petroleum (which held licenses for the Kovykta field and the Verkhnechonsk field), and the Rospan field in West Siberia (the New Urengoy and East Urengoy deposits). BP contributed its holdings in Sidanko, Rusia Petroleum, and its BP Moscow retail network. In January 2004, BP and AAR further agreed to incorporate AAR's 50% stake in Slavneft into TNK-BP. Slavneft, which has operations in Russia and Belarus, was previously owned jointly by AAR and Sibneft (now Gazprom Neft). The joint-venture was initially a 50-50 split, where both partners needed to agree on the course of future action.
In 2009, TNK-BP increased production to 1.69 million barrels per day (269×10^3 m3/d) of oil equivalent (excluding TNK-BP's share in Slavneft production) compared to 1.642 million barrels per day (261.1×10^3 m3/d) of oil equivalent produced in 2008. In 2009, TNK-BP's total proved reserves replacement ratio reached 329% according to PRMS methodology (formerly known as SPE). The average SEC LOF reserve replacement ratio over the past five years amounted to 139%.
On 18 October 2010, TNK-BP and BP reached an agreement for TNK-BP to acquire BP's upstream and pipeline assets in Vietnam and Venezuela for an overall price of $US1.8 billion.
In October 2011, the TNK-BP agreed to acquire a 45% stake in Amazon oil exploration blocks from Brazil's HRT Participaoes for $1 billion.
On 21 March 2013, Rosneft completed acquisition of TNK-BP.
From Wikipedia’s article on TNK-BP, shared under CC BY-SA 4.0.3