Development and Field Test of Shock Absorber in Gas Drilling Tool

In order to effectively alleviate fatigue damage caused by frequent vibration in gas drilling,KPL229 type Drilling-Tool Absorber(DTA)has been developed according to the compressible and damping characteristics of silicone oil.The stress level caused by drilling tool shock has been reduced with the use of KPL229 type DTA through finite element analysis.The field test using KPL229 type DTA has shown that both torque and shock amplitude are reduced.The drilling time has shortened from 5-40 min/m to 5-9 min/m,the footage of single bit is improved,the bit is not worn seriously.The results of finite element analysis and field test show that using KPL229 type DTA can not only reduce the shock damage of drill stem,but also improve the rate of penetration in gas drilling,and improve the service life of drilling tools.Using KPL229 type DTA provides a new solution for the prevention of tool failure caused by shock in gas drilling.At the same time,the energy of vibration can be used to break rock.