摘要
为准确测量旋转钻井时的钻具姿态,提出了一种新的信号处理方法。测斜仪旋转时,垂直于其旋转轴方向加速度计的输出信号中重力加速度信号分量具有周期性特征,以及非周期性离心加速度分量频率低于重力加速度信号分量频率的特征,用高通或带通滤波将非周期性离心加速度分量分离;对于常规滤波方法无法滤除的通频带内振动信号,增加一个对置加速度计,采取不同隔振措施补偿振动信号,滤除通频带内的振动信号。仿真分析表明,测斜仪旋转时离心力作用所导致的测斜仪加速度信息失真可以被高通或带通滤波器有效滤除;与旋转频率耦合的一个振动信号可以分解为2个频率的振动信号;采取不同隔振措施的对置加速度计,可以对振动信号进行补偿,滤除通频带内的振动信号。台架试验也证实,增加一个对置加速度计,并采取隔振措施,可以补偿振动信号,滤除通频带内的振动信号。该处理方法为准确计算井斜角和工具面角等钻具姿态参数提供了技术手段。
To measure the drilling tool＇s posture while rotating and remove interference signals,a new signal processing method is presented in this paper. According to the periodical features of gravity accelera- tion component in the output signal of accelerator perpendicular to the rotation axis of inclinometer, and lower frequency feature of non-periodical centrifugal acceleration frequency than the former, the nowperi- odical centrifugal acceleration component is removed by a high-pass or band-pass filtering. An additional ac- celerometer with different vibration isolation was set opposite to one lateral accelerometer to eliminate the vibration noise within pass-hand which cannot be removed by conventional filter. Simulation analysis shows that centrifugal acceleration signal can be removed by high-pass or band-pass filtering, and it is also dis- closed that a periodic vibration noise coupled with rotation frequency can be divided into two different vi- bration frequency signals. Both simulation analysis and experimental tests show that two lateral accelerom- eters with different vibration isolation set opposite to each other can compensate and remove the vibration noise within pass-band,which provides a way for the accurate measurement of drilling tool＇s posture pa rameters such as inclination and tool-face angle.
出处
《石油钻探技术》
CAS
CSCD
北大核心
2013年第4期110-115,共6页
Petroleum Drilling Techniques
基金
国家科技重大专项"电磁波地质导向工具及远距离穿针技术与装备"(编号:2008ZX05036-004)
"旋转导向及随钻测录
酸性气层测试技术与装备"(编号:2011ZX05021-005)资助
关键词
测斜仪
旋转钻井
井斜角
滤波
干扰信号
inclinometer ~ rotary drilling ~ deviation angle ~ filtering ~ interference signal
