Completion refers to the process of connecting the bottom of a wellbore and the oil reservoir in a certain structure after reaching the designed depth of the open hole well.

 Completion is the last important stage of drilling work and the beginning of oil production engineering, closely related to future oil production, water injection, and the development of the entire oil and gas field. The quality of oil well completion directly affects the production capacity and economic life of the oil well, and even relates to whether the entire oil field can be developed reasonably.