Oil Saturation Boundary for Partial Oil and Partial Water Recognition in the Oil-Water Transition Zone

With the development of oilfield, the oil reserves in oil-water transition zone has become a significant part of comprehensive reserves gradually. Especially the partial oil layer of oil-water transition zone has potential exploitation. But how to identify partial oil layer has become a difficulty in the development planning of the oil-water transition zone. Over the years, there has been little research on the oil-water transition. The oil saturation boundaries for partial oil and partial water recognition are mainly studied in this paper. Two major approaches, theoretical calculation methods and cumulative probability curve have been applied to the study. That will provide the basis for further perforation development and dynamic adjustment.Key words: The oil-water transition zone; Partial oil layer; Oil saturation; Theoretical calculation methods; Cumulative probability curv

Precipitation Behavior and Microstructural Evolution of α Phase during Hot Deformation in a Novel β-Air-Cooled Metastable β-Type Ti-B12 Alloy

The precipitation behavior and microstructural evolution of α phase in a novel metastable β-type Ti alloy, Ti-10Mo-6Zr-4Sn-3Nb (wt.%), during isothermal compression are investigated in this study through the use of SEM (scanning electron microscope), TEM (transmission electron microscope) (HRTEM) (high-resolution transmission electron microscopy) and EBSD techniques. The results show that some finer α precipitates are randomly distributed within the β matrix during hot deformation. The morphological characteristics of α precipitates are distinctly different from those of α precipitates during the same solution-plus-aging treatment. The volume fraction of α precipitate gradually increases with increased true strain. A large proportion of precipitated α phases are prone to be precipitated at HAGBs (high-angle grain boundaries) and LAGBs (low-angle grain boundaries) during isothermal deformation. On the contrary, only a small amount of spherical α phases is precipitated within the β grain. The crystallographic orientation relationships for most spherical α precipitates formed at LAGBs and within the β grains are similar, whereas the crystallographic orientation relationships for α precipitates at grain boundaries are significantly different. The precipitation behavior of α phase in the Ti-B12 alloy during hot compression is considerably influenced by the density of dislocations