engleski

Temperature effect on rheological properties of formate based drill-in fluid

Formate-based fluids has been successfully used in over hunders HPHT well operations since they introduced in field practice. They have many advantages when compared with conventional HPHT drilling and completion fluids such as: minimal formation damage, maintenance of additve stability at high temperatures, reduced hydraulic flow resistance, low potential for differential sticking, naturally lubricating, low corrosion rates, biodegradability with little risk to the environment ect. Formate-based fluids can be applied in deep slim hole drilling, shale drilling, reservoir drilling, salt drilling and gas hydrate drilling. The laboratory testing was carried out to evaluate the rheological behavior of formatebased fluids as a function of temperature. Formate-based fluids were formulated using potassium formate brine, xanthan polymer, PAC, starch and calcium carbonate. Experimental results show that potassium formate improves the thermal stability of polymers.

potassium formate; formate-based fluids; high temperature; rheological properties; drilling

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