When elastic elongation occurs to the drilling string due to tension, the drilling jar can accumulate elastic energy to jar. It is a tool used to relieve the jamming of a drilling tool to make the drilling process safe.

The drilling jar is a downhole tool designed to deliver high-impact blows to free stuck drill strings during fishing and stuck pipe remediation operations. Manufactured in compliance with API Spec 7, this tool incorporates a mechanical or hydraulic delay mechanism that stores energy during tension or compression, then releases it suddenly to generate a powerful impact. Available in both upward and downward acting configurations, the drilling jar can be positioned anywhere in the bottomhole assembly to deliver impact forces precisely where needed. Precision-engineered internal components ensure consistent triggering and reliable performance under extreme downhole conditions.