关键词: 镍铁渣, 固废支撑剂, 微粉处理技术, 复合型造粒包覆技术

Abstract: Under the trend of large-scale stimulated reservoir volume （SRV） fracturing，the cost of hydraulic fracturing proppants has already accounted for more than 50% of the total cost of fracturing materials. The cost of proppants for a single well has risen sharply. Nickel-iron slag is an industrial solid waste，which has a bulk density of 1.78 g/cm³，and a crushing rate of 21.8% at 52 MPa closure pressure. With adhesive agent，curing agent，modifier and other additives added，nickel-iron slag can be made into a new fracturing proppant with a bulk density of 1.62 g/cm³ and a crushing rate of 6.7% at 52 MPa closure pressure by applying multi-stage technologies for shaping，such as micro-powder processing，continuous grading granulation，and composite granulation coating. The new proppant made from solid waste not only adds an additional choice to the types of fracturing proppants，but also contributes to the control of environmental problem caused by industrial waste and the increase of its comprehensive utilization rate by breaking through the restriction of traditional hydraulic fracturing proppants to the efficient development of oil and gas fields.

Key words: nickel-iron slag, solid waste proppant, micro-powder processing technology, composite granulation coating technology