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To understand the reasons for the size difference, we must understand the working principle of the gas lift. As the mainstream artificial lifting method, the core of gas lifting is to reduce the density of crude oil by injecting high-pressure gas into the oil well. However, the “thrust” required for different oil wells is very different: Shallow wells may only require small compressors, while ultra-deep wells require truck-like giant equipment. The gas lifting device used in a shallow oilfield in Karamay, Xinjiang, covers an area of less than 10 square meters; In the deep-sea oilfield in Bohai Bay, the volume of similar equipment is comparable to that of a container-the size difference is directly due to the precise adaptation of manual lifting to well conditions.