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The swelling of clay formation under fi ltrate infl uence is a major issue during drilling with water dispersive drilling fl uid. Formation swelling is a source of borehole’s nominal diameter decrease and may cause complications while drilling, e.g. drill string seizure. Excessive water volume, which is separating out of the mud to formation, may severely aff ect the strength of a rock’s bonding force. This may lead to borehole walls’ pouring cavern forming. Therefore, it causes diffi culties with borehole cleaning and cementing operations. In order to validate the practical utility of developed drilling fl uids for clay drilling, shale of Eocene age a swelling test was conducted. The test was performed in standard conditions [1] using a HPHT Linear Swell Meter.

Linear Swelling Test (LST) of clay formation under the influence of newly developed drilling fluids with the addition of cationic polymers