Abstract: During the exploitation of gas condensate reservoir, especially the low permeability reservoir, the condensate oil will come out when the pressure drops down to the dewpoint pressure, which will cause condensate block and decreases the well productivity, the situation will be worse if the water block exist. So there is significant value to solve these two problems. After investigating domestic and aboard literatures, authors of the paper designe a method of injecting methanol plug +N2(dry gas) puff & huff to decrease the condensate and water block to improve the well productivity. A new methanol/formation water/condensate gas system PVT phase behavior test is also carried out and injecting methanol plug +N2(dry gas) puff & huff experiment conducted, and the method is effectively applied to oil field.

Key words: gas condensate reservoir, condensate, water block, gas injection, methanol injection