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.