Abstract: Water imbibition injection is an essential mechanism of the oil production in low permeability fracturing reservior. Reasonable water injection mode and injection parameters have instructive meaning in improving the development efficiency of low permeability fractured reservior. By a good number of experiments, the dynamic law of natural water imbibition injection and pressure-pulse water imbibition injection for Da'anzai low permeability fracturing reservior were obtained, which can provide theoretical and technical support for reasonable water imbibition injection mode of the reservior.

Key words: fracturing reservoir, water imbibition injection, experiment study