Exploration and Practice of Volume Fracturing Technology of Shale Oil in Dagang Oilfield

Abstract

Based on the geological characteristics of the shale oil in the Kong 2 Member of the Cangdong Sag, Dagang Oilfield, and a large number of core experiments and numerical simulations, the displacement and single-stage liquid volume of the fracturing construction were simulated and optimized; in the stratigraphic shale and stratified mixed shale, the reverse mixing mode is adopted, that is, the gel is used for the rock-breaking seam, and then the low-concentration low-damage fracturing fluid system is used to form the complex seam net. Finally, the high-conductivity-producing area near the well is formed by the addition of sand and gel, forming a personalized horizontal well-cut volume fracturing technology in Dagang Oilfield. The application of this technology in shale oil shows that the output of horizontal well is stable after dense cutting volume fracturing, and industrial development can be realized. Microseismic and stable electric field monitoring confirmed the formation of complex network cracks, and achieved significant yield-increasing effects, providing a reference for the efficient exploration and development of China's continental shale oil.

Application of close cut volume fracturing in tight oil horizontal Wells

“…The proportion of slackwater was increased to 70%, and a large amount of liquid was injected into the formation to ensure that the formation energy was maintained. The maximum fracturing volume and support dose reached more than 4000m ³ and 2400m³ [5]. On this basis, the production of horizontal Wells in tight reservoirs has been effectively broken through after reconstruction treatment, and the stable production capacity has been continuously improved.…”