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Evaluation of gas well productivity in low permeability gas reservoirs based on a modified back-pressure test method

机译:基于改进背压测试方法的低渗透气藏气井产能评价

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In view of the long pressure stabilization time of low permeability gas reservoirs, the traditional backpressure test was modified based on the idea of isochronal test in order to evaluate gas well productivity accurately. Firstly, carry out continuous well startup using 3–4 incremental working systems at the same time interval without the bottom-hole flowing pressure reaching stability; then carry out a prolonged test using a reasonable working system which requires both the bottom-hole flowing pressure and the production reaching stability; finally shut in the well to allow the pressure recover to formation pressure. If the isochronal test productivity calculation method is borrowed for the modified backpressure test, the drawdown pressure will be overestimated, and calculated productivity will be underestimated. The “process conversion-flowing pressure correction” was used to convert the test process into an isochronal test process, and the bottom-hole flowing pressure correction equation was deduced based on pressure superposition principle to solve the productivity calculation problem with this method. The example indicates that the modified backpressure test method can not only shorten the test time significantly and avoid frequent well startup and shut-in, but also can ensure the accuracy of productivity calculation.
机译:鉴于低渗透气藏的压力稳定时间长,基于等时试验的思想对传统的背压试验进行了修改,以准确评价气井产能。首先,在相同的时间间隔内使用3-4个增量工作系统进行连续的井启动,而井底流动压力不会达到稳定。然后使用合理的工作系统进行长时间的测试,该系统既需要井底流动压力,又要达到稳定的产量;最后关闭井,使压力恢复到地层压力。如果借用等时测试生产率计算方法进行改进的背压测试,则压降压力将被高估,而计算得出的生产率将被低估。通过“工艺转换-流动压力校正”将测试过程转换为等时测试过程,并根据压力叠加原理推导了井底流动压力校正方程,解决了该方法的产能计算难题。实例表明,改进的背压测试方法不仅可以大大缩短测试时间,避免频繁的井启动和关闭,而且可以保证生产效率的准确性。

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