PERFHEAL

WELLBORE FLUID ADDITIVES AS BLENDS CONTAINING LIGNOSULFONATES AND SIZED CARBONATES USED TO PREVENT DAMAGE TO PRODUCING ZONES OF OIL, GAS AND WATER WELLS BY INVADING FLUID OR FILTRATE IN THE WORKOVER, COMPLETION, DRILLING, FRACTURING AND PERFORATING OF SUCH WELLS USING FRESH WATER, SEA WATER, OR VARIOUS BRINES