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Drilling Engineering
Published in Nwanosike-Warren Quinta, Oil and Gas Engineering for Non-Engineers, 2022
The well is drilled to a depth just below where the reservoir is thought to be. A rotary rig can drill up to 1,000 feet per day. During the drilling process, well logging is carried out to get information about the rocks and fluids in the reservoir and surrounding rock layers.
Correlation of rock mass classification methods in Korean rock mass
Published in Wang Sijing, Fu Bingjun, Li Zhongkui, st Century, 2020
The application of seismic velocities in geotechnical survey are increasing in determining of in-situ dynamic elastic constants and rock mass classification, etc. One of the measuring the seismic velocities, acoustic logging in fluid-filled borehole have become an important technique in geotechnical application. White(1983) and Paillet and Cheng(1991) presented the most detailed discussion of the theory and interpretation of acoustic logging. The acoustic well-logging sondes that measures the formation velocities typically use sonic frequencies in the range of few tens of kilohertz. In the geotechnical survey using the small diameter borehole, however, reliable measurement of S-wave velocity is not always to be optimistic. We tried to correlate the P-wave velocity by sonic log with rock mass classification. Because any change in the structure and composition of well bore formation virtually induces some changes in the propagation characteristics of elastic waves, it is important to notice that velocities may be dependent on the lithology, porosity, pore fluid type, the stress state, the stress history of the rock, temperature, anisotropy, and so on.
Stratigraphy
Published in Dexter Perkins, Kevin R. Henke, Adam C. Simon, Lance D. Yarbrough, Earth Materials, 2019
Dexter Perkins, Kevin R. Henke, Adam C. Simon, Lance D. Yarbrough
We call the process of collecting geophysical data from boreholes logging, and it is accomplished using instruments of many different types. Figure 9.38 shows well logs for a well at Walakpa Bay in the National Petroleum Reserve of Alaska. The logs, collected by instruments lowered through a drill hole, show density, magnetism, electrical conductivity, and other properties that correlate with different kinds of rocks. Today, many oil companies put great reliance on well logging, because geophysical data can be efficiently gathered and yield a wide variety of information.
Logging evaluation of petrophysical facies based reservoir quality prediction method for the volcanic rocks in the deep depth of Nanpu Sag, China
Published in Petroleum Science and Technology, 2023
Qiuli Yin, Weibiao Xie, Guiwen Wang, Defang Liu
The available well logging suites comprise GR (natural gamma ray), SP (spontaneous potential), lateral resistivity log (RLLD, RLLS), DEN (bulk density), CNL (compensated neutron log), AC (sonic transit time), and Formation Micro Scanner Image logging (FMI). Standardization and normalization of conventional well logging are performed using multi-well histogram and crossplot displays. FMI data has been processed and quality checked through a Schlumberger standard workflow including inclinometry quality check, speed correction, array processing (pad image creation, image-based speed correction and button harmonization) and static/dynamic image creation (Nian et al. 2022). By correlating GR curves and image logs with cores, depth shift of the cores (related thin sections and SEM) is matched with well loggings. Both static and dynamic images deriving from FMI data represent conductive features of formation stratum by using color from light to dark.
Design of the equaliser with lower-order Chebyshev polynomial for bandwidth expansion of transmission channel of logging cable
Published in Australian Journal of Electrical and Electronics Engineering, 2018
Tao Liu, Libin Zhu, Xianhui Yang, Wenxiao Qiao
Petroleum is the mainstay of the modern industrial energy. The demand for petroleum has been growing up in the world. In the petroleum engineering, logging is also known as geophysical logging or well logging. It is the measuring method of geophysical parameters through the physical and other aspects characteristics of rock strata in electrochemistry, conductive, acoustic and radioactive. It is one of the important means to obtain the geological information and resource evaluation in the process of oil and gas field exploration and development. Therefore, the high speed transmission of well logging data has been always one of the research hot spots of petroleum engineering.