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With the continuous development of oil extraction technology, oilfield drilling has become an important part of the oil industry. However, during the drilling process, foam problems often cause troubles to drilling work, such as reducing drilling efficiency, increasing operational risks, and destroying wellbore stability. Therefore, how to effectively control foam has become an urgent problem to be solved in the field of oilfield drilling.

The key roles of defoamers in oilfield drilling are:

- Inhibit foam generation, maintain liquid phase stability, and reduce the interference of foam on drilling operations.

- Control bubbles and foam in drilling fluid to improve drilling efficiency and wellbore stability.

- Improve drilling efficiency: Foam will increase the viscosity and density of drilling fluid, resulting in a decrease in drilling speed and an increase in energy consumption. Defoamers can effectively control foam generation and stability, reduce drilling fluid viscosity, and thus improve drilling efficiency.

- Reduce operational risks: Excessive foam will cause the drilling fluid to lose its lubrication and cooling functions, exacerbating drill bit wear and the risk of wellbore collapse. Defoamers can reduce the interference of foam on drilling operations and ensure the safety of the drilling process.

- Enhance wellbore stability: Excessive foam can easily cause wellbore instability, increase the risk of wellbore collapse and wellbore collapse. Defoamers can reduce foam generation and stabilize foam rupture, which helps improve wellbore stability.

- Save costs: The use of defoamers can improve drilling efficiency and operational safety, reduce drilling fluid consumption and related equipment wear, and thus reduce drilling costs.

The application of defoamers in oilfield drilling has significant advantages, but in actual applications, it is necessary to select the appropriate type and amount of defoamers according to the actual situation of the oilfield and the requirements of the drilling process, and strictly follow the product instructions for preparation and operation, so as to give full play to the effectiveness of defoamers and make greater contributions to the oilfield drilling industry.