Side entry sub used in measurement while drilling in Oil and gas sector. The sensor and MWD components are fitted in the side entry sub and drilling in drilling process it is easy to operate without removing the joints of the connecting members. A side entry sub is a type of downhole tool used in the oil and gas industry during drilling operations. It is a short, threaded pipe fitting that is used to connect a tool or component to the side of the drill string, rather than the top or bottom.

The side entry sub is typically used to facilitate the installation or removal of downhole tools or components, such as logging tools, mud motors, or other drilling equipment. It provides a convenient point of entry to the drill string, allowing tools or components to be installed or removed without the need to disassemble the entire drill string.

Side entry subs come in various sizes and configurations, depending on the specific requirements of the drilling operation. They are typically made from high-strength materials, such as alloy steel, to withstand the high stresses and pressures of drilling operations.

Overall, the side entry sub is an essential component in the drilling process, as it enables the efficient and safe installation and removal of downhole tools and components, reducing the time and cost associated with drilling operations.