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在根据气井井口压力计算井底压力的方法中,平均温度、平均偏差系数计算方法把全井筒的温度,天然气偏差系数视为常数,从理论上来讲不够精确,而按Cullender-Smith方法计算时,是用简化梯形积分即辛卜生积分,比较繁琐。由于手算时,每次都要计算各种参数。文章从纯气柱井底压力的计算公式出发,严格地推导出一种新的表达式,并对式中积分给出精确的解析解,大大简化了计算步骤。
In the method of calculating bottom hole pressure based on wellhead pressure of gas well, the calculation method of average temperature and average deviation coefficient considers the temperature and natural gas deviation coefficient of the whole well as a constant, which is theoretically inaccurate. According to Cullender-Smith method, Is to use a simple trapezoidal integral that sibsheng points, more complicated. As the hand count, each time to calculate a variety of parameters. Based on the calculation formula of the bottom hole pressure of pure gas column, the article deduces a new expression strictly, and gives an accurate analytical solution of integral in the formula, which greatly simplifies the calculation steps.