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井斜测量
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The mechanical wireless inclinometer is an instrument which consists of mechanical and electric technology, surveying the inclination by precise mechanical device and transfering the information to surface by mud-pulse telemetry. The down hole apparatus have four units: survey unit, control device, hydraulic balance and damp unit, and pulser. Its principle is that the inclination information measuring by survey unit is transferred to the pulser through the control unit, then the pulser generate pulse signals....

The mechanical wireless inclinometer is an instrument which consists of mechanical and electric technology, surveying the inclination by precise mechanical device and transfering the information to surface by mud-pulse telemetry. The down hole apparatus have four units: survey unit, control device, hydraulic balance and damp unit, and pulser. Its principle is that the inclination information measuring by survey unit is transferred to the pulser through the control unit, then the pulser generate pulse signals. The pulse signals arc trandfered to the transducer fixed on standpipe by drilling fluid. The numbers of pulse signals indicate the inclination of well bore. It has many features and advantages, such as easy operating, save time, surveying while drillling and so on. The applications show that it can meet the requirement of drilling engineering for surveying drift of vertical wells. It is significant to increase the drilling speed and save costs by using the inclinometer.

机械式无线随钻测斜仪集机械、电子技术为一体,利用精密机械机构来测量井斜,利用钻井液脉冲技术向地面传输信息。井下仪器主要由井斜测量机构、控制机构、液压平衡和阻尼装置以及脉冲发生装置等组成。其工作原理为:通过精密的测量机构测得的井斜信息通过控制机构传递给脉冲信号发生装置后,通过钻井液传递给装在立管上的传感器,由电子记录仪记录的脉冲信号读出井斜角。机械式无线随钻测斜仪具有结构简单、操作方便、测量时间短、可随钻测量等特点。现场应用表明,机械式无线随钻测斜仪完全能够满足直井测斜的需要,对提高钻井速度、降低钻井成本等具有重要意义。

The dynamic measurement of hole inclination is one of the key techniques for the anti-deviation control of automatic vertical drilling.The key of this technique is to pick up information of hole inclination and corresponding direction of hole deflection using gravity accelerometer sensors during drilling.The dynamic measurement of hole inclination is more complex than the static measurement.The measured data may be distorted seriously under the vibration and rotation of drill string.However,the vibration noises...

The dynamic measurement of hole inclination is one of the key techniques for the anti-deviation control of automatic vertical drilling.The key of this technique is to pick up information of hole inclination and corresponding direction of hole deflection using gravity accelerometer sensors during drilling.The dynamic measurement of hole inclination is more complex than the static measurement.The measured data may be distorted seriously under the vibration and rotation of drill string.However,the vibration noises can be eliminated from the inclination measurement by low-pass filter.The centrifugal force caused by rotation of drilling tool will distort the accelerometer outputs,which can only be revised by rotation speed compensation.The methods for selecting low-pass filter and error compensation of accelerometer outputs were proposed and proved by experiments.

井斜动态测量是指在钻井过程中对井眼的井斜角、工具面角等物理量的实时检测和信息的提取,比静态测量复杂,钻具的振动和转动均会导致相应的井斜测量信号严重失真,但其中的振动信号可用低通滤波器滤除,而钻具转动对加速度计所产生的离心力导致的测量信号的失真,则必须通过诸如转速补偿之类的修正才能去除。低通滤波器可选用一定阶数和转折频率的巴特沃斯滤波器,而加速度计输出的转速补偿则须预先对加速度计进行标定。利用专门的实验装置对井斜动态测量的方法及其具体实现进行了有效的验证。

 
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