气体钻井钻具减振器的研制及现场试验

为有效缓解气体钻井钻具频繁振动带来的钻具疲劳损坏,根据可压缩性硅油体积变形减振为主,硅油流过阻尼缝隙的阻尼减振为辅的研制思路,研制出了适用于气体钻井的KPL229型减振器。对加入KPL229型减振器钻具组合的有限元分析表明,加入KPL229型减振器后,钻具受到相同轴向冲击力作用的应力水平降低。现场试验表明,在气体钻井时,与未应用KPL229型减振器的井相比,扭矩不但得到降低,而且波动幅度很小;钻时由5~40 min/m降至5~9 min/m;单只钻头的进尺得到提高,其磨损程度降低。由有限元分析及现场试验结果可知,气体钻井时应用KPL229型减振器,不但可以降低振动对钻具的损伤,延长钻具的使用寿命,而且可以增强气体钻井的提速效果。KPL229型减振器为预防气体钻井时因振动造成的钻具失效或断裂提供了一种新的解决途径,同时可以利用振动能量辅助破岩。 

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.