Chemically Modified Soluble Starches as Green Scale Inhibitors in Petroleum Production.

Area of Science:

• Materials Science
• Green Chemistry
• Petroleum Engineering

Background:

• Scale formation in petroleum facilities poses significant operational challenges.
• Traditional scale inhibitors can have environmental drawbacks.
• Developing sustainable and effective scale inhibitors is a priority for the industry.

Purpose of the Study:

• To investigate chemically modified starches as environmentally friendly scale inhibitors.
• To compare the efficacy of carboxymethyl starch and starch maleate against calcium carbonate scale.
• To evaluate the sustainability of the modification processes.

Main Methods:

• Soluble starch was modified via carboxymethylation and maleic anhydride esterification.
• Chemical modifications were confirmed using infrared spectroscopy and titration.
• Scale inhibition was assessed using tube-blocking tests, SEM, and XRD.

Main Results:

• Both modified starches significantly reduced calcium carbonate inhibition concentrations.
• Starch maleate showed superior performance (125 mg L⁻¹) compared to carboxymethyl starch (150 mg L⁻¹).
• Modified starches altered calcium carbonate crystal morphology and size, enhancing inhibition.

Conclusions:

• Chemically modified starches, particularly starch maleate, are effective green scale inhibitors.
• The maleic anhydride esterification route is a sustainable and efficient modification process.
• Modified starches show significant potential for scale control in petroleum operations.