Abstract: With the great development of CBM exploration technology, it is significant to enhance gas production rate as well as reducing development cost. Hancheng Block is now the main part of productivity construction of PetroChina CBM Company Limited. However, with complicated geological conditions and difficulties of exploration in the Block, it is necessary to focus on the research of CBM production techniques, in order to make a scientific and reasonable production system, thereby increasing the gas production rate. Based on pilot production and analysis on the wells produced over one year in Hancheng Block, this paper found out the factors controlling CBM well extraction effect in the Block, such as the interlayer interference, extraction intensity, and braise blocking. Then some reasonable suggestions are proposed against the controlling factors: 1) to make good control of the fluid level reduction rate to ensure the bottom hole pressure reduced slowly and steadily; 2) to choose the best layers to decrease the degree of interlayer interference; 3) to avoid the braise from blocking the formation by applying special fracturing liquid and using appropriate production facilities.

Key words: Hancheng Block, quantified production, controlling factors, reasonable suggestions