Microstructural Evolution Study of Fe–Mn–Al–C Steels Through Variable Thermomechanical Treatments

Metallurgical and Materials Transactions A - The microstructural evolution of the two austenitic alloys Fe–20Mn–3Al–0.7C wt pct and Fe–20Mn–6Al–0.7C...     

核磁共振测井（CMR）的应用

核磁共振测井具有常规测井无法比拟的优越性。它可以直观，准确地提供储集层的孔隙度，渗透率，区分可动流体和束缚流体，反映储集层的孔隙结构，通过对某CMR核磁孔隙度，渗透率与岩心孔，渗资料的对比分析。建立了两者之间的对应关系，力求精细描述准确的储集层参数；以压汞实验为基础，研究了毛管压力资料与CMR核磁孔径分布曲线的关系，为应用T2谱反演毛管压力曲线奠定了基础；通过求解地层的束缚流体饱和度，结合电阻率测井。采用阿尔奇饱和度解释模型。进行了油（气）层的识别和含油（气）饱和度的计算。从而拓宽了核磁共振测井资料的应用范围，为油（气）层的评价提供了一种新的方法。     

Ozonation of Colored Groundwater Pilot-Scale and Full-Scale Experiences

Two different sources of highly colored groundwater in Southern California, USA, were evaluated to determine the effects of ozone and ozone-hydrogen peroxide oxidation on the water quality of treated groundwater. The water quality objectives were based on color reduction, trihalomethane formation potential (THMFP) reduction, and microbiological stability and regrowth potential of ozonated water in the distribution system, as indicated by the measurement of assimilable organic carbon (AOC). Ozone alone provided better color removal than ozone-hydrogen peroxide oxidation. Even though little overall decreases in dissolved organic carbon (DOC) concentration and THMFP were achieved, a great removal in ultraviolet (UV) absorbance was observed. Ozone oxidation substantially affected the biological stability of treated water as evidenced by the increase in AOC levels. A good correlation was found between AOC and some experimental parameters.     

A simple approach for the modeling of an ODS steel mechanical behavior in pilgering conditions

The optimization of the forming of ODS tubes is linked to the choice of an appropriated constitutive model for modeling the metal forming process. In the framework of a unified plastic constitutive theory, the strain-controlled cyclic characteristics of a ferritic ODS steel were analyzed and modeled with two different tests. The first test is a classical tension–compression test, and leads to cyclic softening at low to intermediate strain amplitudes. The second test consists in alternated uniaxial compressions along two perpendicular axes, and is selected based on the similarities with the loading path induced by the Fe–14Cr–1W–Ti ODS cladding tube pilgering process. This second test exhibits cyclic hardening at all tested strain amplitudes. Since variable strain amplitudes prevail in pilgering conditions, the parameters of the considered constitutive law were identified based on a loading sequence including strain amplitude changes. A proposed semi automated inverse analysis methodology is shown to efficiently provide optimal sets of parameters for the considered loading sequences. When compared to classical approaches, the model involves a reduced number of parameters, while keeping a good ability to capture stress changes induced by strain amplitude changes. Furthermore, the methodology only requires one test, which is an advantage when the amount of available material is limited. As two distinct sets of parameters were identified for the two considered tests, it is recommended to consider the loading path when modeling cold forming of the ODS steel.     

用分辨率匹配技术提高测井曲线垂直分辨率

在薄互层油藏测井数据处理和解释中,为获得较准确的储层参数,需要解决提高分辨率以及不同垂直分辨率测井曲线之间相互匹配的问题。本文给出了一种通过分辨率匹配提高分辨率的计算方法。高分辨率测井曲线降低分辨率使之与低分辨率测井曲线相匹配,可通过匹配线性滤波器很容易实现;而低分辨率测井曲线提高分辨率使之与高分辨率测井曲线相匹配,则不能采用简单的线性滤波方法。本文采用线性滤波和非线性回归相结合的匹配技术可以很好地解决这个问题。此适用于多种测井曲线,如侧向测井、感应测井、中子测井、密度测井和自然电位测井等曲线。