An autonomous electric logger for hydraulic fracturing process

Downhole test data for hydraulic fracturing process is an important foundation of fracturing evaluation and technique improving. However, data acquiring and recording of fracturing process by downhole electric logger, which has a limited memory and a pre-configuring work programme according to a fracturing project, may lose many valuable records due to the difference between this programme and real fracturing operation process. In this paper, the pressure curve and its features of normal fracturing process has been analyzed. A method to distinguish distinct stages of fracturing process has been proposed by a simple logic estimating technique based on pressure and its gradient. An autonomously recording strategy has been given which can distinguish crucial stage and record data in a shorter period than normal. And a test under laboratory condition indicated the design was efficaciously.