What is the Memory Logging?
Memory Logging often referred to as Memory Logging Tools or Memory Sub in the field of oil logging, are downhole tool units that integrate data acquisition, storage and battery power supply.
The core working mode is as follows: first, the measurement data is stored in the internal memory of the tool. After the tool is retrieved from the well, the data is read out through a dedicated interface and then processed and analyzed subsequently.
Features of Memory Logging
The main features of memory logging tools can be summarized in the following aspects:
◆ Cable-free operation (Core advantage)
Cable-Free Operation–there is no need to rely on bulky cable winches and cables, which greatly simplifies the operation equipment and reduces the difficulty and cost of deployment.
Suitable for Complex Well Conditions-it readily handles environments where wireline conveyance is ineffective or extremely risky, such as horizontal, extended-reach, and multilateral wells.
◆ High Reliability
Reduce Failure Points - Due to the elimination of thousands of meters of cables and complex cable connectors, the potential failure points of the system are greatly reduced.
High Temperature & High Pressure Resistance-The design focuses on the harsh downhole
environment (high temperature, high pressure, and strong vibration), and the core storage
units are usually specially reinforced, ensuring high data security.
◆ Limitations
Non-Real-Time Data - The biggest disadvantage is that data cannot be obtained in real time. Data can only be read after the tool is lifted out of the wellbore, and it cannot provide immediate feedback for drilling decisions like cable logging or real-time transmission while drilling.
A-One Oil Memory Logging
Application Range
Memory Logging technology, due to its unique advantages, is particularly widely applied in the following fields:
◆ Horizontal Wells & Unconventional Oil and Gas Development
In the development of shale gas, tight oil, etc., horizontal wells are widely used. It is the key tool for obtaining reservoir evaluation data.
◆ Offshore Drilling & Long Displacement Wells
The space on offshore platforms is limited and the daily operation cost is high. It is compact and highly efficient, making it particularly suitable for offshore operations. In long-displacement wells, cables are difficult to reach the target depth, and storage-based logging is almost the only option.
◆ Re-Examination of Old Wells & Casing Logging
For old Wells that have been casing, it can be lowered into the well through steel wires or tubing to re-evaluate the reservoir properties and provide a basis for production increase measures.
◆ Logging While Drilling
In logging while drilling, the Memory Logging is often used as a backup data recording unit. When the drilling fluid pulse transmission (real-time data transmission) is interrupted for any reason or the signal quality is poor, the storage short section records complete and high-precision data, ensuring the absolute accuracy of the data.
◆ Perforation & Coring Operations
It can be combined with a perforating gun or a coring tube to record the depth and formation parameters during the operation process, ensuring the operation accuracy.
Summary
In conclusion, the Memory Logging in oil logging is a revolutionary data acquisition tool. Through the design of cable-free and downhole data storage, it perfectly solves the logging problems of complex-structured Wells and greatly expands the application boundaries of logging technology.
The core value lies in the fact that it can still efficiently and reliably obtain high-quality underground formation data even when cables cannot be used or the risk and cost of using them are extremely high.
Despite the inherent shortcoming of non-real-time data, its significant advantages in enhancing operational efficiency, reducing operational risks and costs have made it an indispensable standard technical equipment in the modern petroleum industry, especially in unconventional and offshore oil and gas exploration and development. With the continuous advancement of battery technology and storage technology, its performance and application scope will be further expanded.
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