What is the function of a derrick on an oil rig?

A derrick on an oil rig serves as a tall structure that supports the drilling equipment used to extract oil and gas from underground reservoirs. It provides the necessary height for the drilling apparatus, allowing for the insertion and removal of drill pipes and casings. Additionally, the derrick aids in the safe handling of heavy equipment and materials, ensuring efficient and safe drilling operations. Ultimately, it is a critical component for facilitating the drilling process in offshore and onshore oil extraction.