This description supports highly organized fast transfers in this karst aquifer and a highly connected fracture network.
Consequently, local migration paths may develop around storage caverns through the intricately connected fracture network, despite the presence of high pressurized water curtain.
The numerical analysis shows that the effect of a high differential stress is exacerbated by the presence of adversely connected fractures near the bore wall.
In this multiscale approach there exists one fracture function per network and local domain, and in the coarse scale problem there appears only one additional degree of freedom per connected fracture network.
When unfavorable conditions such as heavy-oil, large matrix size, high IFT, low matrix permeability, oil-wet matrix and poorly connected fracture network exist in an oil reservoir, additional support to enhance the matrix oil recovery is inevitable.
During each period of the aquifer test the extensometer, located in W-03 and 27.7 m from the pumping well, was anchored over 2-m-long sections of (1) a fracture in hydraulic communication with EX-1, (2) a fracture that is not hydraulically connected with EX-1, and (3) an unfractured portion of bedrock directly above the hydraulically connected fracture.
This may be due to the possible presence of well intersecting connected fractures.
The focus of this study is put on transient pressure simulation of interwell interference communicated by connecting fracture (i.e. fracture hit) during interference testing of wells with variable operating conditions.
Similar to the conventional double-porosity model, the fracture continuum is primarily responsible for the occurrence of global flow, while vuggy and matrix continua, providing storage space, are locally connected to each other and interacting with globally connecting fractures.
This study indicates that thermal stresses can greatly affect initiation and propagation of fractures and assist the communication between injection pressure and pore pressure in the rock formation; thermal fracturing can be considered as an effective method to connect fracture network, enhance weak zones and create more fractures.
The matrix system may contain a large number of small or isolated cavities, whereas vugs are larger cavities, indirectly connected to fractures through small fractures, microfractures or matrix.
