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Sahle drilling

PETROFORM reduces hydrational stresses and maintains lower pore pressure in membrane efficient shales. The lower pore pressures in the shale’s surrounding of the wellbore result in stiffer and stronger boreholes.

To maintain borehole stability while drilling, an overbalanced pressure is kept in the wellbore. The potassium formate in PETROFORM additionally creates an osmotic outflow of pore fluid to lower shales pore pressure, minimises mud pressure penetration and reduces hydrational stress.

By this PETROFORM can create negative hydrational stress and strengthen even leaky North Sea shales.