A novel polymer, poly(N1,N1-diallyl-N6,N6,N6-tripropylhexane-1,6-diaminium chloride (PTPHDC) was synthesized and tested as corrosion inhibitor for API X60 steel in 15 wt.% HCl solution at 25°C-90°C using Weight loss, electrochemical impedance spectroscopy, linear polarization resistance, potentiodynamic polarization and surface assessments. Results obtained showed that the polymer is an effective corrosion inhibitor for API X60 steel in an acidizing environment. Temperature increase from 25°C to 60°C favors the inhibition performance but performance slightly decline with temperature rise to 90°C. The inhibition efficiency of 100 ppm of the polymer was found to be 86.1, 90.2 and 87.5% at 25, 60 and 90°C respectively. The polymer acted as a mixed type corrosion inhibitor. The polymer performs better under hydrodynamic than in static conditions. The scanning electron microscopy (SEM) and atomic force microscopy (AFM) results are in good agreement with other experimental results and clearly show the effective performance of the polymer even at 90°C. Thermogravimetric analysis (TGA) and Fourier transformed infra-red spectroscopy (FTIR) results showed that the polymer before and after addition to the corrosive medium is stable. The polymer is thermally stable up to 214°C and its functional groups remain intact. The Polymer is a promising candidate for the formulation of an acidizing inhibitor.
Operators have used a variety of strategies to maximize oil well productivity. One such technology is matrix acidizing, which is intended to boost fluid output by improving the drainage efficiency of the reservoir rock surrounding the wellbore [1]. It comprises injecting a strong acid solution into an oil well in order to dissolve and remove formation damage caused by drilling and completion operations, as well as to establish new production paths in production formations [1]. Nonetheless, one of the issues related with well acidizing is corrosion of well tubings, which are mainly made of low carbon steels [2,3]. The corrosion inhibitor technology [3-6], which comprises the addition of corrosion inhibitors to the acid solution, is a practical, dependable, and corrosion mitigation strategy. The inhibitors must protect the tubings for at least 2 hours while the acid is pumped into the generating formation [4] and for up to 24 hours if the acid is utilized as a perforating fluid [4].
