In the process of oil extraction, the polymer in the oil layer and solid particles and other substances carried by crude oil will, as time goes by,  gradually gather near wellbore area and block oil flow path, resulting in a smaller pore and poor near-wellbore area, and thereby lower oil production, and even lead to stop production. Using the long segment gun barrel deflagration fracturing technology that is unique to Tongyuan Oil Tools, the plugging problems at near-wellbore area in old wells will be solved and production restored.