Abstract
On the Gamma ray reception study, this paper presents the heavy metal shielding method, which is using C type heavy metal to shield Sodium iodide scintillation crystal. By rotating the drilling tools to scan and detect the gamma ray which are around the borehole wall formation, On study of angle measurement study, base on accelerometers and fluxgate sensors to design the algorithm which can confirm the detecting instrument measurement window position; Moreover, the paper also presents the Rock formation identification method, which is using changing tendency and sequencing of high side and low side gamma to decide the position of the drilling tool. Field experiments showed that the tool can effectively identify the reservoir and rock formation.
Highlights
Natural gamma ray logging is one of the nuclear logging technique, and it can evaluate rock formation and identify lithology by detecting radiation gamma-ray intensity of different formations and lithology
On the Gamma ray reception study, this paper presents the heavy metal shielding method, which is using C type heavy metal to shield Sodium iodide scintillation crystal
By rotating the drilling tools to scan and detect the gamma ray which are around the borehole wall formation, On study of angle measurement study, base on accelerometers and fluxgate sensors to design the algorithm which can confirm the detecting instrument measurement window position; the paper presents the Rock formation identification method, which is using changing tendency and sequencing of high side and low side gamma to decide the position of the drilling tool
Summary
Natural gamma ray logging is one of the nuclear logging technique, and it can evaluate rock formation and identify lithology by detecting radiation gamma-ray intensity of different formations and lithology. Azimuth gamma ray logging tool makes technological innovation against conventional Gamma Ray logging tool’s non-direction. It detects gamma radioactivity of rock formations by two or more separate sensors in different directions, and decides drilling tool's position by rock formation identification method. This technique is suitable for directional wells, horizontal wells, extended reach wells and branch wells and other difficult. The existing azimuth gamma ray logging tools of domestic and overseas mainly take advantage of more than one detectors which are divided in perpendicular to the axial direction on the drill collar and processed separately [3] [4]. This paper proposed a new scheme which use only one gamma detector in a scanning way to measure azimuth gamma ray, and designed a tubular azimuth gamma ray logging tool
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