Canadian Dip-in DAS (CanDiD) Project 2

The objective of the CanDiD-2 project was to acquire distributed acoustic sensing (DAS) data in a deviated wellbore during hydraulic fracturing operations in nearby horizontal wells, and thereby to characterize the subsurface strain and microseismicity that accompanied the growth of tensile fractures during well stimulation. The experiment took place in the Grande Prairie region of northwestern Alberta, Canada. As one of the first times that a temporary optical fibre was used for this purpose in Canada, a secondary technical aim of CanDiD-2 was to evaluate the effectiveness of a temporarily deployed fibre. The data were acquired using a DAS gauge length of 10m and a spatial sampling interval of 1m, with a temporal sample rate of 1 kHZ. A fibre optic monocable was deployed from the wireline truck and pumped to a depth of nearly 5000m into a deviated well. The raw strain-rate observations were acquired in a proprietary data format and have been converted to .hdf5 data format, which can be read using the open source package h5py (https://www.h5py.org).

CanDiD-2项目的目标在于获取在邻近水平井液压压裂作业过程中，偏离井筒内的分布式声学传感（DAS）数据，进而对伴随井刺激过程中拉伸裂缝生长的地下应变和微地震活动进行表征。该实验在加拿大艾伯塔省西北部的Grande Prairie地区进行。作为加拿大首次使用临时光纤进行此类目的的实验之一，CanDiD-2的次要技术目标在于评估临时部署的光纤的有效性。数据采集使用了10米的DAS量规长度和1米的时空采样间隔，以及1 kHz的时间样本率。一根光纤单缆从电缆车部署并泵送到接近5000米的偏离井中。原始应变率观测数据以专有格式获取，并已转换为.hdf5数据格式，该格式可由开源软件包h5py（https://www.h5py.org）读取。