水锤效应影响洗井效果的原理

Theory of Influences of Water Hammer Effect on Well Cleanout

摘要:

洗井工艺在水文勘探孔成井工艺中占有重要的地位。以封闭反压洗井为例，详细阐述了水锤效应的洗井原理，并通过相应的模型简化推算，得出了水锤效应所造成的水头差可达136 m，在理论上证明了水锤效应具有良好的洗井效果。最后，通过对水锤压强公式中变量的分析，提出了将泵的入水口置于封隔段最底端、提高泵量、减小封隔段长度等3种方法来优化水锤效应的洗井效果。

关键词:封闭反压洗井;水锤效应;水锤波

Abstract:

Cleanout service plays an important role in hydrological well completion. With an example of packed backpressure cleanout, well cleanout by water hammer effect is elaborated in this paper. It is showed that by the model simplification, the water head difference caused by water hammer effect can reach 136m; the good effect of well washing is proved in theory. Based on the analysis on variance in the water hammer pressure formula, 3 methods for well cleanout optimization by water hammer effect are put forward: put suction nozzle of pump at the bottom end of packed interval, increase the pump volume or shorten the length of packed interval.

Key words:packed backpressure cleanout; water hammer effect; water hammer wave