Development and field application of corrosion and scale inhibitor for lower paleozoic gas wells
Due to the higher hydrogen sulfide,liquid salinity and carbon dioxide content in lower paleozoic gas wells,the corrosion and scaling are more serious than those in upper pa-leozoic.Through research,a set of lower paleozoic corrosion and scale inhibitor formula has been formed,which effectively improves the corrosion and scale inhibition effect of gas wells.According to the reasons of corrosion and scaling,27 groups of pharmaceutical evaluation and pharmaceutical screening optimization experiments were carried out,and a set of corro-sion and scale inhibitor formula in weak acidic environment was formed.The self-developed formula in simulated formation water,the corrosion inhibition rate can reach 95.0%,and the scale inhibition rate can reach 89.0%.In the field test of 1 well,the average concentration of scaling ion increased by 44.2%,and the average concentration of iron ion decreased by 69.3%,and the corrosion and scale inhibition effect was obvious.
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