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公开(公告)号：US5316091A
公开(公告)日：1994-05-31
申请号：US32799
申请日：1993-03-17
申请人： Marco Rasi , Mark W. Biegler , Eugene A. Sikirica
发明人： Marco Rasi , Mark W. Biegler , Eugene A. Sikirica
摘要： A method for determining a parameter by combination of engineering models and statistical analysis of drilling data in a data base to determine the frequency or probability of sticking of the drill string during drilling of wells at hole-angles from vertical to horizontal. The parameter can be used to decrease the probability of sticking of drill string during drilling a well and to minimize the cost of a well.
摘要翻译： 一种用于通过工程模型的组合和数据库中的钻井数据的统计分析来确定参数的方法，以确定钻井过程中钻井过程中从垂直向水平井的角度钻井时的频率或概率。 该参数可用于降低在钻井期间钻柱的粘附概率，并将井的成本降至最低。
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2.发明授权Method to combine statistical and engineering techniques for stuck pipe data analysis 失效组合统计和工程技术用于卡管数据分析的方法
公开(公告)号：US5508915A
公开(公告)日：1996-04-16
申请号：US492860
申请日：1995-06-20
申请人： Yuh-Hwang Tsao , William E. Kline , Michele M. Thomas , Eugene A. Sikirica , Albert T. Wang , Marco Rasi
发明人： Yuh-Hwang Tsao , William E. Kline , Michele M. Thomas , Eugene A. Sikirica , Albert T. Wang , Marco Rasi
摘要： The current invention is a method for modeling the probability of a drill string becoming stuck within a given time frame and a method for applying the model to a well being drilled to reduce the probability of sticking. The model is constructed by performing canonical discriminant analysis on engineering parameters derived from observations taken in historical wells and creating a canonical space with the resulting canonical functions. Posterior probabilities of sticking are then calculated from the historical observations and mapped into the canonical space. To apply the model to a particular well being drilled, the values of the previously derived engineering parameters are calculated from observations in the well being drilled, multiplied by their corresponding canonical coefficients, and summed to obtain a canonical point representation for drilling in that well. This canonical point representation is then mapped into the canonical space to obtain the probability of sticking. The probability of sticking is then compared to probabilities experienced in the past under similar drilling conditions. If the probability of sticking in the well being drilled is found to be higher than average historical probability, it can be reduced by implementing remedial measures that are suggested by simple inspection of the values of the engineering parameters.
摘要翻译： 本发明是一种用于建模钻柱在给定时间段内被卡住的可能性的方法，以及用于将模型应用于被钻井以减少粘附概率的方法。 该模型是通过对从历史井中观察得到的工程参数进行规范判别分析，并创建具有所得规范函数的规范空间来构建的。 然后从历史观察中计算出粘附的后验概率，并将其映射到规范空间中。 为了将模型应用到特定的钻井中，先前得到的工程参数的值是根据钻井中的观测值乘以其对应的规范系数计算得出的，以获得在井中进行钻井的规范点表示。 然后将该规范点表示法映射到规范空间中以获得粘贴的概率。 然后将粘附的概率与在过去类似的钻井条件下经历的概率进行比较。 如果发现钻井中粘附的概率高于平均历史概率，则可以通过简单检查工程参数的值来实施补救措施来减少。
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公开(公告)号：US5327984A
公开(公告)日：1994-07-12
申请号：US32808
申请日：1993-03-17
申请人： Marco Rasi , Eugene A. Sikirica
发明人： Marco Rasi , Eugene A. Sikirica
摘要： A method is provided, based on assigned drilling variables, for predicting the area of open region above a bed of cuttings resulting from drilling a high-angle well. The area of the bit used in drilling is compared with the area of the open region and drill pipe to determine a Hole-Cleaning Ratio. Occurrences of sticking of drill pipe or other drilling problems in prior-drilled wells are correlated with Hole Cleaning Ratio in those wells to determine a relationship for predicting risk of drilling problems in wells of interest. Risk factors so determined are used to modify conditions or equipment during drilling or to plan future wells.
摘要翻译： 提供了一种基于分配的钻井变量的方法，用于预测钻孔高角井所产生的切屑床上方的开放区域的面积。 将钻孔中使用的钻头区域与开放区域和钻杆的面积进行比较，以确定孔清洁率。 在钻井中发生钻杆的钻孔或其他钻井问题与这些井中的孔清除率相关，以确定预测井中钻井问题的风险的关系。 如此确定的危险因素用于在钻井过程中修改条件或设备，或者对未来的井进行规划。
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