1. A CONTINUOUS METHOD OF CEMENTING WELLS, COMPRISING THE STEPS OF: (A) MIXING A PREDETERMINED AMOUNT OF A WATER SWELLING CLAY WITH A PREDETERMINED AMOUNT OF WATER IN A FIRST MIXING APPARATUS, THEREBY FORMING A CLAY-WATER SLURRY; (B) TRANSFERRING THE CLAY-WATER SLURRY SUBSTANTIALLY SIMULTANEOUSLY AS MIXED TO A SECOND MIXING APPARATUS; (C) MIXING A PREDETERMINED AMOUNT OF HYDRAULIC CEMENT WITH THE CLAY-WATER SLURRY SUBSTANTIALLY SIMULTANEOUSLY AS THE CLAY-WATER SLURRY ENTERS THE SECOND MIXING APPARATUS, THEREBY FORMING A CLAY-CEMENTWATER SLURRY; (D) PUMPING THE CLAY-CEMENT-WATER SLURRY DOWN A STRING OF PIPE IN A WELL BORE AND UP THE ANNULAR SPACE BETWEEN THE STRING OF PIPE AND THE WALLS OF THE WELL BORE; AND, (E) ALLOWING THE SLURRY TO SET.