A Quantum Leap in Horizontal Gravel-Pack Technology

Abstract

Proposal Horizontal gravel packs typically employ heavy sand or ceramic gravels, laid down with un-gelled brines in the well-known alpha/beta wave sequence.As operators push the limits of horizontal open hole interval lengths, especially in low fracture gradient formations, it may become technically difficult or economically unfeasible to perform the gravel pack with conventional fluids and gravels. Ultra lightweight gravels allow significant reductions in pumping rate (to avoid fracturing the formation), without risking premature settling and screen-out, therefore, longer wells can be treated.Higher gravel concentrations can also be used, even at low pump rates, resulting in drastic reductions in fluid volumes and treatment time, which is critical in cost-intensive offshore applications.In certain instances, the alpha wave can be eliminated, and the well packed directly in the beta wave mode, from toe to heel. This paper summarizes the development and application of the ultra lightweight media and associated technologies for horizontal well gravel packing.Pioneering case histories will also be reviewed from the initial wells treated.