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New underground control valve (control valve) to enhance underbalanced drilling
At the end of 2005, the underground control valve (control valve) of diameter 177.8mm underbalanced drilling developed by Xinjiang Petroleum Administration Drilling Technology Research Institute was first applied and successful in Guang'an 8 Well of Sichuan Oilfield. This is the kind of control valve (control valve) for the first time in the country. It marks another major technical breakthrough made by Xinjiang Bureau of Petroleum Administration in under-balanced drilling technology. In 2005, Xinjiang Petroleum Administration Drilling Technology Research Institute of scientific and technological personnel have overcome the diameter of 177.8 mm underbalanced drilling downhole control valve (control valve) structural design and processing and other technical difficulties in the indoor rigorous test, a lot of Sub-structure optimization, so that the parameters more scientific and reliable. Guang'an 8 wells with three open nitrogen underbalanced drilling. The downhole control valve (control valve) with a diameter of 177.8mm underbalanced drilling operated for 13 days in the well of Guang'an 8 well and finished 547 meters of drilling footage. The work was normal and the field application was completely successful. At present, the well is trial production and the ignition of the combustion pipe outlet is successful. The successful application of the downhole control valve (control valve) with a diameter of 177.8mm underbalanced drilling in Well Guang'a 8 marks that the Drilling Technology Research Institute of Xinjiang Petroleum Administration has owned full scale series of downhole control valves (control valves) for underbalanced drilling. At the same time, it also indicates that the technology of underbalanced drilling is being improved daily and the level of under-balanced drilling equipment in Xinjiang Bureau is significantly raised.