Oilfield chemistry

Sodium Gluconate as a New Environmentally Friendly Iron-Control Agent for Acidizing

This work introduces sodium gluconate as an efficient and environmentally friendly iron-chelating agent.

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Fig. 2: Iron concentration in the samples collected while neutralizing 5 and 10 wt% HCl loaded with 5,000 and 10,000 ppm iron (III), respectively, in the presence and the absence of 1:1 molar ratio of sodium gluconate.

Iron precipitation is a serious problem in acidizing treatments, causing formation permeability damage by restricting flow channels. Solutions have included buffers, reducing agents, and chelating agents. Experience has shown that chelating agents are the most effective; however, limitations of current chelating agents include poor stability at elevated temperatures, higher cost, low solubility in acidic medium, tendency to precipitate calcium products, and negative health and environmental effects. This work introduces sodium gluconate as an efficient and environmentally friendly iron-chelating agent.

Introduction

Corrosion is a major challenge in any acidizing treatment.

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