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对非溶解气驱油田提出了一个计算自喷井井底流动压力的统计数学模型。该模型算法简便,只需要井口数据,因此特别适用于缺乏流体高压物性分析资料的油田使用。利用胜坨油田403个资料点计算的全部误差均在4％以下。根据六组文献数据计算对比表明,该模型有较广泛的适应性。分析了井口参数变化对井底流动压力的影响,确定了并口参数之间的统计关系;并由此导出了在一定工作制度下计算油井停喷压力的公式,对55个井口压力低于10大气压的资料点计算表明,这个公式精度更高。
A statistical mathematical model for calculating the pressure at the bottom of a jet from a well is proposed for the non-dissolved gas drive oilfield. The model algorithm is simple and requires only wellhead data and is therefore particularly suitable for use in oilfields that lack material properties for high-pressure fluid analysis. The total error calculated using 403 data points in Shengtuo Oilfield is below 4%. Comparisons of six groups of literature data show that the model has a wide range of adaptability. The influence of wellhead parameter variation on downhole flow pressure was analyzed and the statistical relationship between parallel port parameters was determined. Based on this, the formula for calculating stoppress pressure of well under a certain work system was derived. The pressure of 55 wellheads was lower than 10 atm The data point calculation shows that this formula is more accurate.