Abstract: Based on the principle and model of data envelope analysis (DEA), the single well production in Guang'an Block 2 of Xujiahe gas reservoir in Sichuan basin is evaluated, including the interwell lateral comparison, the static-dynamic reserves and production potentials prediction of each gas well, the effectiveness of DEA and the relations among gas wells. The results indicate that the DEAeffective wells are basically high-yielding wells; the wells with large potentials of static reserves are mostly mid-yielding wells; the wells with large potentials of dynamic reserves are mostly low-yielding wells; the wells with big production potentials are all of potentials in static and dynamic reserves. According to the productivity analysis of gas well of Xu-6 member in Guang'an gas field, most gas wells can be of higher tested gas productivity after sand fracturing.

Key words: Sichuan basin, Guang'an gas field, DEA model, Xujiahe gas pool, production potential