利用脉冲试井方法研究低渗透油藏的连通性

脉冲试井分析方法是研究油藏连通性的一种有效方法,并在中、高渗透油藏中得到了较好的应用,但不适宜于低渗透油田.针对低渗透油藏脉冲试井压力的反应特点,研制了新的脉冲试井理论图版,使理论图版的无因次时滞由小于1改进为大于1,并给出了相应的解释方法.对一个井组的实测资料进行了解释和分析,结果表明,新的脉冲试井理论图版可以满足低渗透油藏脉冲试井资料的解释要求,从而使脉冲试井方法不仅适用于中、高渗透油藏,而且适用于低渗透油藏,为定量评价低渗透油藏的连通性提供了一种有效的手段.

Study on connectivity of low-permeability reservoirs with pulse-testing method

The connectivity of a low_permeability reservoir has a significant effect on its development.The pulse_testing method has been applied widely in the medium_permeability and high_permeability reservoirs,but it is not favorable to study the communication features of the low_permeability reservoirs.Some new typical curves for the pulse_testing analysis are developed,and the analysis method is improved according to the response features of the pressures in the low_permeability reservoirs.The range of dimensionless time delay is extended from the value below 1.0 to over that.The practical data of the transient pressure acquired from a well group of Daqing Oilfield were interpreted with the new typical curves.The result shows that the new typical curves could meat the needs for interpreting the practical pulse_testing data of the low_permeability reservoirs.It is confirmed that the pulse_testing analysis is an available means for quantitatively evaluating the connectivity of the low_permeability reservoirs.