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本文导出压力指数法计算地层压力的公式,计算所用的资料,不需关井和测液面就可取得,只需两个流压和产量。经67口井的验证,符合率为87.6%。为地层压力资料测取很困难的泵抽井,提供了一个简便实用的方法。抽油机井的地层压力是一项很重要的资料,目前广泛采用液面恢复法计算。但这种方法不仅关井影响产量,而且频繁地测恢复液面,工作量很大。支[1]和文[2]提出用两种工作制度下的产量和流压计算地层压力,但园采油指数取的较粗糙,因而使计算结果误差较大。为了解决这个问题,笔者导出了压力指数法计算地层压力的公式,经67口井的计算对比,误差在2.5大气压以内的井占87.6%。
This paper derives the formula of pressure index method to calculate formation pressure, and calculates the data used. It can be obtained without shutting in wells and measuring the liquid surface, only two flow pressures and outputs are needed. After verification of 67 wells, the coincidence rate was 87.6%. It is a simple and practical way to find difficult pumping wells for formation pressure data. The formation pressure of pumping wells is a very important data, widely used liquid level recovery calculation. However, this method not only shut down the well and affect the output, but also frequently measures the level of liquid recovery, which requires a lot of work. In [1] and [2], it is proposed to calculate the formation pressure with the output and flow pressure under two working regimes, but the crude oil production index is relatively rough, which makes the calculation error larger. In order to solve this problem, the author derives the formula for calculating the formation pressure by the pressure index method. After 67 wells are calculated and compared, 87.6% of the wells have an error of 2.5 atm.