Preparation and Performance Evaluation of an Environmentally Friendly Lubricant for Water-based Drilling fluid

Abstract

With the increasing difficulty of exploration and development of oil and gas resources, the problems of high friction torque in long horizontal well section and high temperature in deep well are increasingly prominent, which put forward higher technical requirements for the lubricity, temperature resistance and environmental protection of drilling fluid lubricant. Traditional drilling fluid lubricants are difficult to meet the above technical requirements. Based on the optimization of modified vegetable oil, extreme pressure agent, surfactant, antioxidant and preparation conditions, an environmentally friendly drilling fluid lubricant SDGL-2 was developed. The evaluation results show that the lubricant SDGL-2 has fluorescence grade of 1~2, temperature resistance of 160 °C, good biodegradability and no toxicity. Its lubricity is better than that of common drilling fluid lubricants, and it is compatible with several common drilling fluids.