Coiled tubing originated from the allied "Pluto" during the Second World War in the 1940s. The plan is that the Allied Forces will lay a submarine oil pipeline across the English Channel between Britain and France, with a total length of nearly 49,000 mm. This oil pipeline consists of 23 pipelines, among which the inner diameter is 76. 2mm and butt welding. 1962, the first portable coiled tubing workover device was jointly developed by California Oil Company and Bowen Oil Tools Company. The outer diameter of coiled tubing used is 33. Mainly used for sand washing and well washing of oil and gas wells in the Gulf of Mexico. After the 30th anniversary of the birth of coiled tubing, its value was really recognized by people. By the 1990s, coiled tubing technology had developed by leaps and bounds. Coiled tubing operation device is known as "universal operation machine", which is widely used in workover, drilling, completion and logging of oil and gas fields, and runs through the whole process of oil and gas production. The development of coiled tubing equipment in the world is as follows: 1962, the world 1 coiled tubing equipment was born; There were about 200 sets in the mid-1970s. At 1993, there are about 56 1 set; 200 1 at the beginning of the year, about 850 sets; At the beginning of 2004, there were about 1050 sets, mainly distributed in North America, South America and Europe. 20 1 1 begins with 188 1, and there are 6 1 in China.