Optimization and Key Parameter Study of Pilot Test Area for Coal-Rock Gas Horizontal Well Development

This article conducts in-depth research on the optimization and key parameters of the pilot test area for the development of coal rock gas horizontal wells. The study first analyzed the geological profile of the Ordos Basin, clarifying that coal, rock, and gas resources are abundant and have enormous exploration potential. Subsequently, based on the characteristics of coal rock reservoirs, a key parameter table for evaluating coal rock gas favorable areas was established, and key parameters such as structural changes, coal seam thickness, reservoir cap combination, and surface gathering and transportation conditions were finely characterized through a combination of geological and seismic methods. On this basis, Nalinhe, Mizhi, and Suide were selected as pilot test areas to comprehensively cover the geological characteristics and landform of the 8 # coal seam in the Changqing gas area. The study also utilized numerical simulation and dynamic analysis methods to evaluate the single well indicators of horizontal wells, predict EUR at different horizontal section lengths, and design differentiated development supporting technologies. Finally, the study proposed an optimization plan for the development of coal rock gas horizontal wells, providing a scientific basis for improving single well EUR and gas well production, and having important guiding significance for promoting the scale and efficiency development of coal rock gas in the entire gas area.