Hydraulic fracturing with proppants is a well-established technique to increase well productivity. However, uncontrolled mineral scale deposition within the proppant pack can result in reduced conductivity and fracture performance. An active scale-control strategy is required, especially in the presence of a waterflood. The full-length paper describes design criteria for porous, scale-inhibitor-impregnated proppants (SIIPs) for the North Sea.