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The physical property of Chang 6 reservoir in Yanchang oilfield is poor, and the heterogeneity is strong. Multistage fracturing of horizontal wells is easy to form only one large horizontal fracture, but it is difficult to control the fracture height and length. The new mining method of “bow horizontal well + multistage horizontal joint” can effect...
Citations
... Distributed fiber sensors hold a remarkable position within the realm of fiber optic sensors, signifying a genuinely innovative milestone in scientific investigation (Gorshkov et al., 2022). Specialized fiber optic cables are deployed along the wellbore prior to hydraulic fracturing operations. ...
... Notably, vertical extension mapping via cross dipole method is crucial in hydraulic fracturing. It identifies water zone communication and aids multi-layer operations (Gao et al., 2023). Precise mapping optimizes oil/gas production from each zone and minimizes inter-layer communication risk. ...
... The reservoir sedimentary environment is relatively stable, and the technology for horizontal well development is relatively mature [54][55][56][57][58]. Compared with other countries, China's reservoir of terrigenous clastic rock sand bodies has stronger vertical and horizontal heterogeneity; thus, studying the fine sedimentary microfacies of horizontal wells is recommended [59][60][61]. The segmented microfacies description of a single horizontal well combined with vertical well data is essential for objectively characterizing different reservoir sand bodies. ...
The study of sedimentary microfacies of horizontal wells is important for improving oil recovery using horizontal well technology. Vertical well data alone do not provide accurate enough information to determine the sedimentary microfacies of horizontal wells. Therefore, a comprehensive method combining the data of both horizontal and vertical wells was established to identify sedimentary microfacies of horizontal wells and applied to a single horizontal well in the Daqing oilfield in China’s Songliao Basin. The results identified the study area as a delta sedimentary environment, mainly subdivided into four microfacies types: a distributary channel, the main overbank sand, the overbank sand, and an interdistributary bay. The criteria for identifying each sedimentary microfacies were established. Among them, the criteria for identifying distributary channels include a natural gamma value continuously less than 90 API; a resistivity value continuously greater than 11 Ω·m; a logging curve, which is typically bell-shaped or box-shaped with very high amplitude and amplitude difference; a mainly siltstone lithology; and a total hydrocarbon content (Tg) continuously greater than 3%. The variations in the two types of channel boundaries (narrowing of the channel boundary and reverse extension of the bifurcated channel boundary) were corrected. The research results can provide guidance for the efficient development of favorable reservoirs in oilfields using horizontal well technology.
