NOVELTY - The method involves positioning a screen assembly (14a) comprising a screen (14) and transport tubes inside a well when the transport tubes extend along length of the screen, where the transport tubes define exit ports (18). Well treatment fluid is pumped into the well, where the well treatment fluid comprises a carrier fluid and ultra-lightweight particulates with an apparent specific gravity (ASG) less than or equal to 2.45. The treatment fluid is made to flow through the ports in the transport tubes. A gravel pack comprising ultra-lightweight (ULW) particulates is formed onto the screen.    USE - Method for gravel packing a well e.g. horizontal well, deviated well, vertical well, oil well, gas well, geothermal well and open hole well (all claimed), for penetrating a sand formation.    ADVANTAGE - The method enables use of ULW particulates in multi-path screen gravel pack operations to reduce friction pressures in a work string across the formation, so that generation of bridges and incomplete gravel packs is minimized. The method enables the ULW particulates to be preferably used without a gel carrier, thus avoiding drawbacks associated with viscous carrier fluids. The method enables a need for gels, so that the fluid does not require breaker additives, thus eliminating a need for specialized blending and pumping equipment. The method enables increasing packing density and improving long term packing efficiency by use of neutral buoyant ULW particulate in the carrier fluid when the gravel pack does not have to be broken if packing operations are complete. The method enables the gels used to help keep conventional particulates to be suspended to cause up to 15% after-pack settling when the breaker is applied, so that initial packing efficiency is improved and the screen of the screen assembly is protected by using the well treatment fluids. The method enables eliminating a need for damaging polymer residues, thus reducing risk of near-wellbore damage and negative effects on production. The method enables the use of ULW particulates in the well treatment fluid to reduce friction pressures in the transport tubes and eliminate a need for the well treatment fluid to be viscous or require a presence of a viscosifying agent, so that formation damage is minimized.    DETAILED DESCRIPTION - The carrier fluid is fresh water or completion brines. The ultra-lightweight particulate is a natural product selected from chipped, ground or crushed nut shells, seed shells, fruit pits, processed wood, walnut, pecan, coconut, almond, ivory or brazil nuts, peach, plum, olive, cherry, oak, hickory, walnut, polar and mahogany. The ultra-lightweight particulate is beaded, cubic, cylindrical, bar-shaped, multi-faceted, irregular or tapered in shape.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a formation of an annular sand bridges in an open hole gravel pack operation using a well treatment fluid containing ULW particulates.    Screen (14)    Screen assemblies (14a-14c)    Exit ports of tubs (18)    Horizontal wellbore (20)    Sand formation (36)