Sampling while drilling

CDA Actuators in Downhole Tools

CDA Brushless Motor and Pump

The energy sector, particularly the downhole oil and gas industry, relies heavily on advanced technologies to improve productivity and efficiency, especially as drilling depths continue to increase. One such technology is brushless DC motor actuators, which offer several benefits over traditional actuators. While Brushless DC motors require commutation, gone are the brush blocks, brushes, and armature of the traditional brush motor that limit the life and reliability.  Brushless DC motor actuators are used in various applications in the energy sector, including downhole drilling, well intervention, and production control. This blog post will discuss the benefits of brushless DC motor actuators in the energy sector, focusing on downhole oil and gas applications.


Small Size

One of the key benefits of CDA’s brushless DC motor actuators is their small size. Due to the limitations of the drill diameter, downhole drilling and completions require compact equipment that can operate in harsh environments. CDA’s brushless DC motor actuators are ideal for these applications because of their inherent power density.  They can be easily integrated into downhole tools, and even flooded with oil, providing precise control and movement and sampling in confined environments.



Given the limited available space within a downhole tool, power density & efficiency are paramount.  CDA’s brushless DC actuators are highly power-dense by design, making them ideal for use in remote and isolated locations where power is limited. They require less energy to operate, reducing overall power consumption. Any reduction in power consumption addresses limited power resources and potentially leads to significant cost savings.  CDA’s power density also allows the downhole tool to go deeper and hotter without needing to increase the diameter of the tool.


Arguably, the most significant benefit of CDA’s brushless DC motor actuators is their reliability. The downhole environment is harsh, reaching higher temperatures, high pressures, and corrosive fluids. Traditional actuators can struggle to operate in these conditions, leading to increased maintenance and downtime. CDA’s brushless DC motor actuators are designed to operate in these harsh environments with robust materials and can even operate while flooded with oil. They are also less prone to wear and tear, reducing the need for maintenance and improving overall reliability.  CDA currently has downhole brushless motors that have been operating in tools for more than 10 years without needing a replacement!


CDA’s brushless DC motor actuators offer several benefits over traditional actuators, making them ideal for use in the downhole oil and gas industry. Their small size, power density, and reliability make them well-suited for downhole drilling, intervention, and production control. As the energy sector continues to evolve into new markets such as Geothermal, CDA’s brushless DC motor actuators will undoubtedly play an even more significant role in helping countries obtain energy independence by improving productivity, reducing maintenance costs, and ensuring the safety of workers and equipment in the downhole environment.

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