连续管钻井定向器肋力矢量控制不确定性分析方法

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中图分类号：TE921 文献标识码：A DOI：10.12473/CPM.202407109

Abstract：In the process of coiled tubing（CT）directional driling，the downhole parameters have some uncertainties.To more accurately control the welbore trajectory to advance along the planned course，an uncertainty analysis method for rib force vector control of orientor at a certain confidence level was proposed.First， based on the theoryof vertical and horizontal bending beam，a 3D force modelof botomhole assembly（BHA）for CT driling was built.Second，combined with the spatial geometric relationship between the direction of orientor rib force vectorandtheorientationof tooface，the expressonof theorientorrib steering resultant-forcevector was determined.Third，based on the principle of minimum energy，acontrol scheme and variation lawof each rib force vector were established.Fourth，the probabilistic method was used to conduct statistical analysis on the random distribution stateand sensitivitydegree of the experimental parameters，derive the probability densityfunctionand cumulative probabilityfunctionof the2Drandom variablesof therib force vectors of theorientor，andobtainaconfidence nterval modelfor predicting therib force vectors at acertain confidence level.Finally，the proposed uncertaintyanalysis method fororientorrib force vector controlwas verifiedthrough field test.The testresults show that the weightonbitandtherandomnessofthe toolfaceorientationofNo.1ribare the mainfactorsaffcting theuncertainty of rib force vector control of CTdriling orientor.When therib force vector exceeds the uncertainty confidence interval proposed，the actual welbore trajectory deviates seriously from the planned course.When the rib force vector is within the confidence interval，theerrorbetween theactual wellore trajectoryand the planned course is very small.The research results guide the eficient implementation of welbore trajectory control in CT drilling.

Keywords： CT drilling；orientor;rib force;vector control;uncertainty；confidence interval

0 前言

连续管可内置光纤和电缆，避免了常规钻柱的数千次反复连接与拆卸，可以显著提高作业效率。（剩余8921字）