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Error analysis of well path survey calculation methods
CHEN Wei-qing, GUAN Zhi-chuan
(College of Petroleum Engineering in China University of Petroleum , Dongying 257061, Shandong Province, China)
Abstract:
By use of numerical method, a kind of reference curve could be constructed to analyze the error of well path survey calculation, and the reference conditions for error analysis of suney calculation were obtained. And on this basis,several usual survey calculation methods such as average angle method,corrected average angel method, balance tangent method, minimum curvature method and cord segment method were examined. The result indicates that these survey calculation methods errors have the similar error characteristics. The survey calculation error takes linear variation tendency with the variation of measure depth parameter. On the error diverse points plots, the dispersivity of the error is weak and prone to be the systematic error. Through the analysis of the relative large sample space, the result indicates that all survey calculation methods error could be expressed approximately by one uniform formula if undergoing comprehensive well trajectory's error analysis. The parameters of the uniform formula were calculated by means of the least square method.
Key words:  well path  survey calculation  error analysis  matching  least square method