Azerbaijan's national oil company SOCAR is planning to invest $10 billion in Turkey's petrochemical firm Petkim in the next seven to eight years, SOCAR said Wednesday. "SOCAR invested $2.2 billion in Petkim between 2008-2014. We plan to invest $10 billion in the next 7-8 years," SOCAR president Rovnag Abdullayev was quoted by Azerbaijan Press-Release Agency, APA, as saying.