天然气工业2018，Vol.38Issue(5)：61-70,10.DOI:10.3787/j.issn.1000-0976.2018.05.007
页岩储层体积压裂复杂裂缝支撑剂的运移与展布规律
Migration and distribution of complex fracture proppant in shale reservoir volume fracturing
摘要
Abstract
In this paper, a large-scale experimental system was established to identify the migration and distribution laws of complex fracture proppant in shale reservoir volume fracturing. With this system, the effects of secondary fracture angle, fluid displacement, proppant concentration and size, fracturing fluid viscosity and other factors on the migration and distribution of proppant were tested, and the migration and distribution of proppant in primary/secondary fractures were analyzed. The following results were obtained. First, the fluid flow pattern in fractures transforms gradually from laminar flow into turbulent flow with the increase of fracture supporting height. Second, the migration modes of proppant in fractures mainly include suspended migration and gliding migration. Third, the distribution form of proppant in primary fractures before branching is related to secondary fracture angle, fluid displacement and proppant concentration and size, among which the fluid displacement is the most important factor. Fourth, the mass ratio of proppant in primary fractures after branching is proportional to the secondary fracture angle, fluid displacement, fracturing fluid viscosity and proppant concentration and size, and is inversely proportional to the flow ratio between secondary fractures and primary fractures. Fifth, the mass ratio of proppant in secondary fractures after branching is proportional to fluid displacement, fracturing fluid viscosity and flow ratio between secondary fractures and primary fractures, and is inversely proportional to secondary fracture angle and proppant concentration and size. Sixth, the angle at the leading edge of proppant bank in the primary fractures after branching is proportional to the proppant concentration and size and the flow ratio between secondary fractures and primary fractures, but is inversely proportional to secondary fracture angle, fluid displacement and fracturing fluid viscosity. Seventh, the angle at the leading edge of proppant bank in the secondary fractures after branching is proportional to the secondary fracture angle and the proppant concentration and size, but is inversely proportional to the fluid displacement, fracturing fluid viscosity and flow ratio between secondary fractures and primary fractures. In conclusion, the research results can provide a theoretical support for proppant optimization and program design of shale reservoir volume fracturing.关键词
页岩/储集层/体积压裂/复杂裂缝/支撑剂/运移与展布规律/实验室试验系统Key words
Shale/Reservoir/Volume fracturing/Complex fracture/Proppant/Migration and distribution/Experimental system引用本文复制引用
潘林华,张烨,程礼军,陆朝晖,康远波,贺培,董兵强..页岩储层体积压裂复杂裂缝支撑剂的运移与展布规律[J].天然气工业,2018,38(5):61-70,10.基金项目
国家自然科学基金青年科学基金项目"页岩水平井'多段分簇'压裂支撑剂分流与展布机理研究" (编号:51604050) （编号:51604050）
重庆市社会民生科技创新专项"页岩水平井'多段分簇'压裂支撑剂运移与展布评价仪器研发" (编号:cstc2016shmszx90003). （编号:cstc2016shmszx90003）
