Abstract: Changqing Oilfield’s tight oil production construction has a long history and a large scale, and it remains a key focus in oilfield production and construction, with new production capacity accounting for 36.6%. Targeting the geological characteristics of tight oil, with the goal of achieving the best adaptation between well patterns and fracture networks, an integrated geological engineering research approach is employed. Through methods such as numerical simulation, big data analysis, and field practice, fracturing optimization design is carried out, resulting in the formation of precise segmented fracturing technology for short horizontal wells with coiled tubing. The integrated technology package includes key technologies such as “optimization of fracturing timing, differential fracture design, precise fracture control, enhanced imbibition oil displacement, multi-stage temporary plugging within fractures, and directional perforation.” This technical model has been implemented in over 200 wells in the Changqing Oilfield’s tight oil reservoirs, significantly improving the degree of horizontal well fracture control and oil production. Microseismic monitoring results show that the degree of fracture control has increased from 60% to over 85%, and the initial production of a 100-meter horizontal section has increased from 1.5 t/d to 3.2 t/d. Single well production remains stable, reaching an annual production rate of 3.0 t/d, with overall good results. The fracturing key technologies developed from this research effectively support the efficient development of tight oil in the Ordos Basin and provide direction for the next phase of technical breakthroughs. The insights gained offer references and lessons for the large-scale and efficient development of similar oilfields in China.

Key words: Ordos Basin, Tight Oil Reservoir, Fracturing technology, Geoengineering integration, Waterflood development