Abstract: A method of treating a subterranean formation at temperatures of at least 150° C. is disclosed. The method comprises introducing a pressurized fracturing liquid comprising proppants and solid channelants to create fractures in the subterranean formation, wherein the channelants comprise polylactic acid (PLA) solids derived from a blend of poly L-lactic acid (PLLA) and poly D-lactic acid (PDLA).

Abstract: A continuous spin-draw-winding process to prepare a drawn polyester yarn suitable for use in high-speed tires and run-flat tires having high energy to break in combination with a good dimensional stability, including extruding molten polyester through spinning holes in a spinneret to form a bundle of molten spun filaments, solidifying the spun filaments by a gaseous cooling medium, fixing the spinning speed of the solidified filaments at a first godet in the range of 4050 to 5000 m/min, drawing the solidified filaments at a draw ratio less than 1.75 to form drawn filaments. The drawn polyester yarn has a high amorphous orientation distribution, a high crystallinity and a coarse structure. Dipped cords including such polyester drawn yarns exhibit excellent dimensional stability at higher temperatures.