In order to explore and exploit oil and natural gas deep in the strata, people must use a variety of drilling equipment and tools to drill through hard and complex formations, which is the main task of drilling. In order to meet the needs of the rapid development of China's petroleum industry, it is necessary to drill more wells, drill wells, and drill wells to double the drilling speed. To this end, while fully mobilizing the positive factors of people, we must also provide drilling workers with advanced and well-performing drilling equipment and tools to make full use of modern science and technology to serve oil drilling. Drilling equipment and tools include surface drilling equipment (oil rigs) as well as drill bits, drill strings, and the like.
The drilling jar is a downhole release tool that is connected to the drilling tool to perform drilling operations along with the drill string. It is usually connected between the drill collar and the drill pipe, or the upper part of the drill collar, or at the third drill pipe above the "neutralization point" of the drill string (ie. The part is not compressed or pulled after the drill collar is pressurized). In deep wells, offshore drilling, especially directional good drilling, drilling jars are often placed in the lower BHA, so that once the lower BHA is stuck, the drilling jar can be manipulated to release it by jarring up or down.
According to its principle, drilling jars can be divided into three types: mechanical type, hydraulic type and hydraulic-mechanical type. According to its function, it can be divided into three types: up drilling, down drilling and up-down type.