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溢流关井水击压力的大小直接决定了现场是采用“软关井”、“半软关井”,还是“硬关井”的关井方式。从溢流关井实际情况出发,应用质量守恒原理、牛顿第二定律建立了气液两相流的溢流关井水击压力数学模型,采用基于特征线法的有限差分法求解数学模型,同时编制了相应的计算机程序并进行了实例计算。计算表明:①所建立的数学模型,适用于“软”、“半软”、“硬”关井的水击压力计算;②“硬关井”、“半软关井”、“软关井”井内水击压力逐渐减小;③井内压力波动由井口到井底逐渐减小,井内为气液两相流时产生的压力比单相流更小。为了便于油气田应用,建议在瞬态模型的稳态化方面开展进一步的研究。
The magnitude of the water hammer pressure of the overflow-shut-in well directly determines whether the site adopts the “soft-shut-in”, “semi-soft shut-in” or “hard shut-in” shut-in mode. Based on the actual situation of overflow well-closure, the mathematical model of the water hammer pressure of the overflow flow of the gas-liquid two-phase flow is established by applying the principle of conservation of mass and Newton’s second law. The finite difference method based on the characteristic line method is used to solve the mathematical model. Simultaneously Compiled the corresponding computer program and carried out an example calculation. The calculation shows that: ① The mathematical model established is suitable for the calculation of water hammer pressure of “soft”, “semi-soft” and “hard” shut-in wells; ② “hard shut-in”, “ ”The well water hammer pressure gradually decreases; ③ The pressure fluctuation in the well decreases from the wellhead to the bottom of the well, and the pressure generated by the gas-liquid two-phase flow in the well is smaller than the single-phase flow. In order to facilitate the application of oil and gas fields, further studies on the steady state of transient models are suggested.