罐子里面

Surface jar is a most effective tool for resolving stuck drill tool problem in downhole., the surface jar in operation can result in violent downward jarring force felt upon the stuck catch. Easy to operate, the tool can be easily adjusted in terms of its jarring strength. Unique in design, the bumper jar capable of performing non-stop down jarring operation can not only bear heavy load and strong torque but also withstand, owing to its excellent sealing property, mud circulation under high pump pressure. The application of the surface jar for consecutive years has shown that this tool is a most safe, reliable and effective releasing tool.