Development and Application of Real-Time Monitoring System for Direct Push Storage Logging

The existing direct push storage logging systems generally lack real-time monitoring capability for downhole tool status. The operation is essentially carried out in a “blind logging” state, making it impossible to accurately identify the location of a failure or the operational status of the tool in the event of sticking or blockage. This poses a risk of logging failure. To address this limitation, a measurement while drilling (MWD) system was integrated with the direct push storage logging tool, leading to the development of a direct push storage logging system with real-time monitoring capability. The system consists of a surface acquisition system, MWD tools, and a direct push storage logging tool. It employs 2PSK continuous drilling fluid pulse modulation and adaptive filtering signal extraction technology to achieve real-time uplink transmission of key parameters, including downhole tool communication status, operating voltage, current, and tension/compression load, etc. Field tests were conducted in four wells in the Tarim Oilfield, with a maximum well depth of 8771 m, a maximum downhole temperature of 178 °C, a maximum bottomhole pressure of 98 MPa, and a maximum operation duration of 66 h. During the logging operations, real-time monitoring of the logging tool status was successfully achieved, enabling accurate identification of tool sticking or blockage conditions. This provided a basis for on-site operational decision-making and significantly improved logging success rates and operational safety in complex wells. To address the current issue of low drilling fluid pulse transmission rates, it is recommended that future research focus on high-speed wireless transmission technology to further enrich the types of real-time monitoring data.