This is purely haram as it is based on Fixed Return. Investment doesn;t guarantee fixed amount and who ever claims that the returns are fixed are faking and this cannot be halal. As per my little knowledge of investment, returns and schemes. There is no way to "double money" unless and untill it is purely based on cheating or some hot services sector business. Oil drilling is not a service sector business, thus there is no chance to get "double money" from there. Not to mention that drilling oil in Pakistan sounds more funnier.