pressure during implacement and during the subsequent fracturing treatment for the diverting agent to perform effectively it must be essentially inert to the carrier fluid and relatively stable during mixing and injection into the formation and it must remain bouyant throughout the injection process into the formation this means that the diverting agent must have a crush strength greater than the pressure applied during injection for example the glass and ceramic spheres used herein are types of inorganic 34 ballons 34 which can be crushed but generally have about 90 95 percent of original floaters in a given mass of diverting agent in the carrier fluid at atmospheric conditions and have a high percentage e g about 80 85 percent or more floaters after being subjected to a hydrostatic pressure of about 2000 pounds per square inch psi the amount of diverting agent present in the second fluid can be varied to convenience because of the low bulk density of the material it has been found convenient to blend the second fluid to contain from about 250 to about 1000 pounds of diverting agent for 1000 gallons of fluid total volume basis but higher loading levels could be used the second fluid requires increasing amounts of hydraulic horsepower to pump the fluid at any given.