A number of wells in the Sichuan Basin China have tested industrial gas flow pressure arising from shale Da’anzhai section Ziliujing Formation, revealing good exploration potential. Microfractures shales affect enrichment and preservation are important storage spaces seepage channels for gas. In order to increase productivity reduce risks associated with exploration, types, connectivity, propor...

Outcrop studies have revealed the presence of abundant cemented fractures in many low permeable formations. Recovered cores have also revealed the opening of some of these smaller size fractures on the wall surface of main hydraulic fractures. Furthermore, earlyproduction well-testing analysis in some of these cases provide estimates for hydraulically induced fracture surface areas which are mu...

Wavelet Transform was applied to Acoustic Emission (AE) signals from Scratch Tests (ST) on stainless steel samples with Cr and Ti nitride surface coatings obtained by PVD. The implementetion of the signal processing method was aimed at characterizing the coating failure stages and evaluating the quality of and the differences between both type of coatings. In previous work we had identified dif...

During carbon dioxide (CO2) injection process, overpressure within targeted reservoirs might occur because of changes in stress related to the CO2 pressure, which could lead to deformation of the surrounding rocks, including caprocks which are geological formations with low permeability overlying a CO2 storage reservoir. The understanding for impact of effective pressure (i.e., the difference b...

Aiming at the problem of quantifying composition complex fracture network and activation after fracturing, a model weak plane with prefabricated structure is established based on finite element method, global embedded cohesive zone (CZM), real shale outcrop. Considering influence fully coupled stress/fluid, effects azimuth, horizontal stress difference, fracturing fluid viscosity, injection rat...

Carbonate reservoirs develop many different types of microfractures that play an important role in increasing the effective reservoir space and permeability. Thus, qualitative quantitative characterisation effect on permeability rocks is essential. In this study, a method for evaluating impact microfracture parameters carbonate rock was proposed. Lattice Boltzmann simulations were carried two d...

The presence of nodular aggregates of woven bone situated on porotic trabeculae has been described in the patella in chondromalacia patellae (Darracott and Vernon-Roberts, 1971) and in the femoral head in osteoarthrosis and rheumatoid arthritis (Todd, Freeman, and Pirie, 1972). The distribution and microstructure of the nodular aggregates indicate that they may represent some form of new bone f...