为了准确计算实钻轨迹,提出了井眼轨迹模式定量识别方法,并进行实例分析。随钻测量数据可以提供井斜角、方位角以及工具面角的实测值,据此提出利用工具面角来识别井眼轨迹模式的技术思路。根据导向钻具的定向造斜机理建立了适用所有井眼轨迹的工具面角方程,结合各种井眼轨迹模型的特征参数便可计算工具面角理论值。评价工具面角理论值与实测值之间的误差,可优选出最符合实际的井眼轨迹模型。井眼轨迹模式识别提供了测斜计算方法的定量评价指标和选用依据,可避免主观和随意选用测斜计算方法等问题,从而能提高井眼轨迹的监测精度及可靠性。图1表1参17
In order to accurately calculate drilled trajectories, method of quantitatively recognizing borehole trajectory models was provided, and case analysis was conducted. Because the measurement-while-drilling data provide with measured values of tool-face angle besides inclination angle and azimuth angle, this paper presents the technological approach of recognizing borehole trajectory models based on tool-face angle. A universal tool-face angle equation was established based on the directional deflection mechanism of steerable drilling tools, and it can calculate the tool-face angles with characteristic parameters of various borehole trajectory models. Then, by evaluating the error between the theoretical value and the measured value of tool-face angle, the trajectory model most consistent with the actual well trajectory can be selected. The model recognition of borehole trajectory provides with the quantitative evaluation index and selection basis of survey calculation methods, which can avoid subjectively and randomly selecting the survey calculation method, and consequently improves the monitoring accuracy and reliability of borehole trajectory.
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