页岩油体积压裂原位生成支撑剂材料研究进展

The complex fracture system formed by the volumetric fracturing of horizontal shale oil wells requires effective support to maximize the effect of volumetric fracturing. However, due to the high density and large particle size of the existing proppants, they are difficult to migrate to the distal end of the main fractures and the interior of the micro-fractures. In order to achieve the support of full-scale fractures in volumetric fracturing, researchers propose the technical idea of generating proppants through in-situ reaction of fracturing fluid and the rock, so that the proppants can go wherever the fracturing fluid goes. In this paper, two kinds of in-situ proppants generation methods under the stratum temperature and pressure are reviewed. One is the synthesis of inorganic mineral particle proppants by hydrothermal method, and the other is the formation of polymer particle proppants sensitive to temperature and pressure. Following the introduction of the methods and principles of in-situ proppant particle generation, the performance of in-situ proppants is compared with that of traditional proppants, and the application prospects of in-situ proppants generation is discussed. Using new fracturing fluid to form in situ proppants under stratum conditions may bring a new change to the whole oil and gas industry and even the energy field. It is hoped that the research towards in-situ proppants formation can attract more attention from researchers.