There is rich natural gas resources in the Ordos Basin, where the concealed reservoirs with strong heterogeneity will be a great challenge for the gas development. During the "Eleventh Five-Year Plan" of the PetroChina Changqing Oilfield Company, the development pattern has been adjusted accordingly; technical difficulties have been tackled; cost-effective exploitation of low-permeability gas reservoirs has achieved success, and the key technical bottlenecks have been eased in improving the per-well productivity by horizontal well technology and stimulation measures for tight gas reservoirs. As a result, the Changqing gas zone has obtained its annual gas production capacity of over 20 billion m3, which realizes the economic and highly effective development of low-permeability gas reservoirs in the Ordos Basin. However, the Changqing Oilfield Company has more than one trillion m3 of non-producing gas reserves to be exploited in tight sand reservoirs with multiple thin layers and with a complex gas-water relationship. To achieve the cost-effective development of such difficult-to-produce gas reserves, we present our main goals of enhancing the EOR and per-well productivity and reducing the development cost and also point out that technical problems should be solved in five aspects: forecast of gas reservoirs with multiple thin beds, comprehensive identification between gas and water layers, the ROP improvement in horizontal wells and multi-stage fracture treatment, multi-layer reservoir stimulation by vertical wells, and EOR enhancement.
