滤波稳定器适用性分析及试验评价

Applicability analysis and test evaluation of filter stabilizer

钻井过程中钻具的剧烈振动易引发MWD、LWD等精密仪器失效、钻头早期受损、钻具疲劳断裂等事故。重点分析深井、超深井井下工具振动影响因素,将安装滤波稳定器作为抑制钻柱振动冲击的主要措施,利用滤波稳定器核心组件弹性位移变化,实现钻柱轴向振动能量的吸收和释放,建立力学模型优选其安装位置,以便削减和过滤底部钻具组合的轴向和周向振动。现场井段应用滤波稳定器后的效果明显,保证了仪器信号的稳定传输、钻压和扭矩的有效传递,有效降低了钻柱黏滑效应,延长了钻头寿命,提高了机械钻速。

Severe vibration of drilling string during operation is likely to cause accidents including precision instrument(such as MWD and LWD)failure,early damage of drill bit,and drill string fatigue fracture.In this study,factors influencing downhole tool vibration in the deep and ultradeep well are analyzed,and the filter stabilizer is installed as the main measure to deal with drilling string vibration.Elastic displacement of core components in the filter stabilizer is utilized for axial vibration energy absorption and release of the drilling string.A mechanical model is built to select the installment location for the reduction and filtering of axial and circumferential vibration caused by bottom hole assembly.Obvious improvement is achieved after the application of filter stabilizer in field well sections,assuring stable transmission of instrument signals,and effective transfer of bit weight and torque.Besides,the stick-slip phenomenon of drill string can be reduced effectively,increasing drilling bit life and penetration rate.