A review of laboratory studies and theoretical analysis for the interaction mode between induced hydraulic fractures and pre-existing fractures

Hydraulic fracturing techniques have been widely used to create complex fracture network in unconventional reservoirs. The complexity of hydraulic fracture is significantly influenced by pre-existing fractures that widely exist in reservoirs. A better understanding of the interaction mode between induced hydraulic fractures and preexisting fractures is helpful to estimate the fracture complexity, stimulated reservoir volume, and completion efficiency. In the present study, a review is conducted on the induced hydraulic fracture behaviours and interaction processes in laboratory test and theoretical analysis. It includes the effects of a series of parameters on the fracture behaviours, interaction modes, and interaction mechanism. Advantages and drawbacks of several theoretical criteria are compared, which are widely used to study the interaction mechanism. The sensitivity analysis of geological condition and hydraulic fracturing parameters on the interaction mode is performed. Then, some important findings in laboratory used to optimize operations of fracture-stimulation in the field are discussed. Based on the literature review, promising studies are recommended, which may provide more profound insights into study of the interaction mode.

Automated summary

This study reviewed induced hydraulic fracture behaviors and interaction processes in laboratory tests and theoretical analysis. It explored the effects of various parameters on fracture behaviors, interaction modes, and mechanisms, compared different theoretical criteria, conducted sensitivity analysis on geological conditions and hydraulic fracturing parameters, and discussed important findings for optimizing fracture-stimulation operations in the field. Promising studies were recommended for further insights into the study of interaction modes based on the literature review.