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A pig is one of the devices used for mechanically cleaning pipes, and it has four main functions. First, pipeline cleaning, rust removal, drying, sealing, and purging. This application is mainly used in gas and liquid pipelines on land or at sea. Second, wax removal, scale removal, as well as water and dust removal from pipelines during oil field production. This function is primarily designed for use in oil pipelines or pipelines transporting a mixture of oil and gas. Third, the isolation of different media. It is used when it is necessary to isolate different fluids, in order to prevent them from mixing, causing contamination, or undergoing chemical reactions. Fourth, anti-corrosion coating inside the pipeline. This internal coating technology for pipes is a new technique aimed at removing scale and sediment from within pipes as well as providing corrosion protection for them; it has since evolved into an integrated technology that encompasses various fields such as transportation engineering, mechanics, electronics, and chemistry. Of course, these days pigging is also being used in lift oil production techniques; pigs are employed to prevent liquid from flowing back and to generate high-pressure gas, thereby increasing crude oil recovery rates. This article is reprinted from Jilin Province Zhaoxi Petroleum Technology Co., Ltd. http://www.jilinzhao*.com/