Casing-Cement-Formation Sealing Integrity Evaluation Device

The evaluation device is divided into multiple independent functional modules: high-temperature autoclave module, high-pressure pumping module, temperature control module, pressure control module, and data acquisition module. Each module performs a specific function, allowing the complex system to be managed through modular components that can be independently optimized and maintained.

A computer control system serves as an intermediary that coordinates between various control modules (temperature control, pressure control, data acquisition) and the physical evaluation apparatus. This intermediary layer integrates multiple functions and enables automated control while maintaining system modularity.

The evaluation apparatus employs a nested structure where the cement ring sample is placed inside the casing, which is in turn placed inside the high-temperature autoclave. The high-pressure pumping system injects fluid into the annular space between the casing and autoclave wall. This nested arrangement maximizes space utilization and enables compact device design while maintaining all necessary evaluation functions.

The evaluation system utilizes the radial dimension by applying pressure through the annular space between the casing and autoclave wall, rather than requiring a large horizontal pressure application system. This dimensional approach allows compact design while achieving the necessary confining pressures for accurate evaluation.

The evaluation system dynamically adjusts temperature and pressure parameters through computer-controlled modules. The temperature control module can heat the autoclave to simulate high-temperature well conditions, while the pressure control module independently adjusts confining pressure and internal pressure. This dynamic control allows simulation of alternating and combined stress-temperature conditions that match actual wellbore environments, enhancing both adaptability and reliability.

The system employs independent control of multiple parameters: temperature (via heating system), confining pressure (via high-pressure pumping into annular space), and internal pressure (via pressure injection into the cement ring). By independently varying these parameters, the system can simulate various wellbore conditions including alternating temperature-pressure cycles, sustained high pressure, and thermal shock, thereby achieving both high adaptability and evaluation reliability.