| Abstract: | The function of drilling fluid includes the removal of the cuttings from the bore hole, the supporting of the hole wall, the cooling of the bit, and the maintenance of the hydrostatic equality with the formation pressure. The clay suspension preferred to employ these purposes possess adequate flow limits and gel strengths, the water retensivity however is insufficient. With the addition of carboxymethylcellulose the dispersion of clay in water and the water retensivity are improved. In the present publication, the influence of carboxymethylcellulose in clay-water and sodiumchlorid-saturated clay-water suspension on the rheological properties and the water retensivity are investigated. |
