Application and Practice of Geological Engineering Integrated Tight Oil Fracturing Technology in Jidong Oilfield

The tight oil reservoir of X5 fault block in Jidong oilfield is characterized by multi-thin and inter-bedded reservoir with poor physical property and strong heterogeneity. Vertical wells located in study area are facing production problems such as poor water injection efficiency, rapid decline and short stable production periods after fracturing, and well-controlled reserves are relatively low. Multi-staged horizontal well fracturing is an effective way to increase single well productivity. Therefore, research on geo-engineering integrated fracturing technology was carried out. First of all, a geo-engineering integrated fracturing design optimization process is proposed, the tight oil reservoirs were categorized into Class I, II and III and a differentiated parameters design chart for different reservoir quality was established considering both economic output and productivity. Moreover, a mudstone interlayer breakthrough fracturing experiment was innovatively proposed to maximize horizontal well productivity. Simulation research was carried out to explore the relationship between fracturing parameters and single well EUR, and also to study the effect of different proppant combinations on conductivity of fracture network. Laboratory experiments were conducted to evaluate different surfactant and fracturing fluid performance since displacement and imbibition played important roles in the recovery of tight oil reservoir. After series of simulation and laboratory experiments, the geo-engineering integrated tight oil fracturing technology was successfully applied in the development of X5 tight oil in Jidong Oilfield, and have provided valuable guidance for tight oil fracturing.