关键词: 开发技术政策, 低渗透, 气藏工程, 水平井, 大牛地气田, 鄂尔多斯盆地

Abstract: Daniudi gas field is a typical tight sandstone gas reservoir.The remaining non-produced reserves are charac-terized by poor quality, thin net pay thickness and poor vertical superimposition of pay zones.For these types of reservoirs, it is critical to optimize technical policy of horizontal well development and perfect gas reservoir engineering technique series.Empirical formula, dynamic performance analysis, numerical simulation and economic evaluation were used to optimize technical policies including productivity evaluation, single well design, well pattern and spacing and other aspects regarding horizontal well development.We defined the principles of strata series classification and selected mutiple methods of productivity evaluation.The study shows that the gas production should be proportionally 1/5~1/3 of open-flow capacity, and the lateral should be 1 000~1 200 meter long.The well trajectory should be perpendicular to the maximum principal stress and be located as close as possible to the center part of the reservoir.The fracturing design should refer to the quantitative calculation model.The well pattern should be staggered line-drive with a well spacing of 800~1 200 meter.The abandonment formation pressure should be 8 MPa.All these factors would finally yield a recovery factor of 40%.The optimized parameters have been applied to the Daniudi gas field, and they provided a strong technical foundation for the successful implementation of the development plan in this tight sandstone gas reservoir.

Key words: technical policy for development, low permeability, gas reservoir engineering, horizontal well, Daniudi gas field, Ordos Basin