Oil up $2 above $81 on China rates, possible OPEC move

* China cuts interest rates to help sagging economy * Venezuela willing to cut oil production, minister says * Market beginning to expect OPEC cut, analysts say (Updates detail, prices, comment; paragraphs 1, 4-6) By Christopher Johnson LONDON, Nov 21 (Reuters) - Brent crude oil rose more than $2 to above $81 a barrel on Friday after China cut interest rates and on speculation that OPEC could ...