Research and application of side tracked hole （STH） pumping technology

Oil production is low by using the side tracked hole（STH）technology developed from sidetrack drilling in boreholes of old wells. Therefore, adjustable pumping methods are adopted to improve oil production. In view of the shortcomings of conventional pumping technologies that can only pump with a simple pipe string, an adjustable pumping tool that can meet the requirement of STH pumping is developed, which helps solve the difficulties of higher wellhead, low formation energy, relatively low liquid level, and difficult drainage of liquid of side tracked hole. Some idle STH with low production are used effectively. The tool has been applied to several wells so far. It is shown that the new tool can be tripped in, pulled out, preferable isolation, and long-standing resistance. Also the labor intensity of workers gets low, production efficiency is improved. It can be used further.