Summary Borehole seismic data from vertical seismic profiles (VSP) provide valuable information in different stages of reservoir evaluation. Land VSPs are generally acquired using a wireline-specific run involving a logging unit, a downhole geophone-based tool, and vibrator truck operating 10 hours to 1 day for typical zero-offset VSP surveys (ZOVSP). Nowadays, novel technologies, such as fiber optic cable, allow geoscientists to get VSP measurements while reducing logging times to minutes and reducing the environmental footprint of the operation. Distributed acoustic sensing (DAS) and electric hybrid logging cable allow borehole seismic information to be efficiently obtained over the entire well in a fraction of the time required by conventional methods. The land ZOVSP surveys discussed in this work were acquired while conveying various logging tools with a hybrid optical heptacable by Ecopetrol S.A. in Colombia onshore. In many of these jobs, data acquisition is carried out in areas close to communities, houses, or infrastructure that may be impacted by closing roads or by vibrations emitted by the seismic source. Also, high levels of noise for long periods could distress nearby inhabitants. The reduction of carbon footprint is a direct benefit when using this technology. Less operating time can reduce CO2 emissions over 90% in a VSP acquisition. ZOVSPs with conventional geophone technology were estimated to take in average 17 hours in wells with the profiles considered here. In contrast, with DAS on hybrid logging cable, this operation takes 1.5 hours, which immediately translates into a lower carbon emission footprint equating to an estimated 95% CO2 reduction per job.
Tópico:
Seismic Waves and Analysis
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FuenteSPE Latin American and Caribbean Petroleum Engineering Conference