... Abstract Logging-while-drilling (LWD) ultra-deep resistivity technology can explore the reservoir on a similar scale to seismic, so interpreted resistivity models can be combined with seismic sections to enable oil field operators to delineate pay zones better, improve reservoir understanding...

..., azimuthal EM LWD tools propagate EM fields in three dimensions with an ultra-deep depth of investigation (DOI). Robust inversion algorithms both one dimensional (1D) and three dimensional (3D) derive the position and resistivity of formations within the DOI from measurements induced by the propagated fields...

..., this process is difficult to do manually. To simplify this, inversion algorithms are deployed to represent EM logging while drilling (LWD) measurements as models reflecting the geology. Inversion results are not a direct measurement, therefore confidence in the results is critical. Real-time well placement...

... conveyed with the drilling bottom hole assembly as part of the LWD (logging while drilling) formation evaluation suite. While there are clear advantages of directly probing the formation fluids soon after drilling, there are also more challenges associated with the dynamic drilling environment. The FMWD...

...Introduction Abstract Production logging tools (PLTs) and formation testing, even in logging while drilling (LWD) conditions during underbalanced drilling, are key technologies for assessing the productivity potential of a gas well and therefore to maximize recovery. Gas bubble detection...

..., and permeability is required to identify the productive fractures and optimize production. In this paper, we discuss the first application of the latest Logging-While Drilling (LWD) high-resolution laterolog resistivity image in combination with LWD multi-pole sonic to provide comprehensive fracture...

... the applications envelope against specific objectives. A new logging-while-drilling (LWD) technology of pitch-catch (PC) ultrasonic is under development, that can also provide borehole images of compressional and shear slowness in anisotropic and / or heterogenous formations both in water and oil-based-mud...

... Abstract Deep directional resistivity LWD measurements have been shown to be sensitive to resistive transitions over a broad range of distances around the tool from tens to hundreds of feet. These detected transitional surfaces are primarily used to detect formation resistivity boundaries...

...LWD Image Interpretation Borehole images ( Figure-6 ) revealed that the studies interval was characterized by a sequence of deposition rich in sand and shaly sand. The absence of clear hemipelagic shale deposit posed a challenge in the identification of the structural dips. The average...

... dispersion computation. And subsequently, this method is extended to LWD cases ( Yang et al., 2011a ). The disadvantage of the "guidance- mismatch" method is that its cost function is very sensitive to noise and therefore it requires the input dispersion data to be noise-free, which clearly is not the case...

... pressure and target zone depth prediction. This paper will describe the different techniques applied in this field to optimize mud weight and accurate prediction of casing shoe position. Using real-time LWD and mud logging data, pore pressure was calculated and geomechanics model was updated while...

... and is fully consistent with the 1D and 2D inversion results in sections of lower complexity. The inversion is validated with a realistic 3D reservoir model and applied to field datasets from the North Sea, revealing complex 3D detail consistent with all the data. reservoir characterization lwd...

... Abstract This paper presents a novel borehole image compression algorithm for real-time (RT) logging while drilling (LWD). The compression scheme is designed to optimize the critical information required for RT decision making at low telemetry bandwidths. In the proposed algorithm we estimate...

... Abstract Obtaining high-resolution borehole images in oil-based mud (OBM) from logging-while-drilling (LWD) tools has been made possible through the recent development of ultrasonic imaging technologies. High-resolution acoustic impedance images enable reservoir evaluation through...

... Abstract Ultradeep resistivity logging-while-drilling (LWD) is now a routine service for real-time well landing,geosteering, and reservoir and fluid contact evaluation. Progressing beyond layered earth inversions to three-dimensional (3D) inversions helps improve real-time decisions to deliver...

... of the methods considered is validated by guided inversion for typical job stages (pre-well, real-time, post-well) and applications (landing, reservoir navigation, mapping). Inversion results for extra-deep logging-while-drilling (LWD) resistivity tools are usually shown as a multi-layer resistivity...

... Abstract The recent trend toward drilling horizontal wells with complicated geometries in complex reservoirs has led to operational challenges. While LWD logs are often well suited in these environments, circumstances such as very small wellbores, tool availability, and high costs sometimes...

... to multiple data driven answer products from downhole tools. Extra deep azimuthal resistivity logging while drilling (LWD) tools can detect boundaries up to 30 m away from the wellbore given optimal resistivity conditions. Combined with multicomponent inversion modelling (MCWD), the data acquired are used...

... Abstract In recent years, there has been a strong interest in evaluating casing to cement bond with an LWD sonic tool. In 2013, we presented an amplitude-based approach, similar to what is used with wireline tools with its potential and limitations. During this study, extensive modeling...

... shows that the ZX curves are most sensitive to the changes of bed azimuth. This is the reason why we call ZX measurements directional curves and use them for geosteering. Abstract Azimuthal resistivity logging-while-drilling (LWD) tools are widely used in geosteering because of their azimuthal...