Bottom Cylinder Buffering and Sealing for HPHT Coring Simulators
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Solution Overview
Problem
Existing high-fidelity coring calibration platforms for oil and gas exploitation lack a buffer device, leading to damage and oil leakage when the piston retracts, and have low assembly and disassembly efficiency due to direct connection via flange, failing to meet actual use requirements in high-temperature and high-pressure environments.
Innovation Solution
A bottom cylinder design for high-temperature and high-pressure simulators featuring a piston with a buffer ring at the bottom and a matching buffer ring on the cylinder base, along with a locking device using a linear motor to prevent piston impact, and a stepped surface for improved sealing and assembly efficiency, including grooved clips and countersunk threaded holes for secure connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If no buffer device is provided in the cylinder, then the structure is simple, but the piston impact damages the cylinder bottom causing oil leakage
Solution Approach 1:
The patent applies beforehand cushioning by installing a buffer device at the bottom of the cylinder before the piston reaches it. The buffer device includes a buffer piston, buffer spring, and buffer chamber that absorb the impact energy when the piston retracts to the bottom, preventing damage to the cylinder bottom and ensuring reliable operation under high-temperature and high-pressure conditions.
2Strength
If the cylinder is connected to the simulator through a flange, then the connection is secure, but the assembly and disassembly efficiency is low
Solution Approach 1:
The patent applies segmentation by dividing the connection structure into modular components: the cylinder body with integrated connection features, the simulator interface, and quick-connect elements. This modular segmentation allows the cylinder to be quickly assembled and disassembled from the simulator while maintaining secure connection strength, significantly improving maintenance efficiency.
3Force
If the piston retracts to the cylinder bottom under high mass load, then the driving force is sufficient, but the impact force damages the cylinder
Solution Approach 1:
The patent applies the intermediary principle by introducing a buffer piston and buffer spring as intermediary elements between the main piston and the cylinder bottom. When the piston retracts, the buffer spring gradually absorbs the impact energy, acting as a mediator that reduces the harmful impact force while allowing the main piston to maintain sufficient driving force for moving the high-mass rock core.
Data Source
AI summary
A bottom cylinder for a high-temperature and high-pressure environment simulator of a high-fidelity corer is provided. The bottom cylinder includes a cylinder barrel. The bottom of the cylinder barrel is provided with a cylinder base. The piston is provided inside the cylinder barrel and divides an inner cavity of the cylinder barrel into a rodless cavity and a rod cavity. The piston is provided with a piston rod. The outer wall of the cylinder barrel is provided with an oil inlet hole communicated with the rodless cavity, an oil outlet hole communicated with the rod cavity, and a reserved hole. The lower end surface of the piston is provided with a first buffer ring, and the upper surface of the cylinder base is provided with a second buffer ring mated with the first buffer ring. The bottom cylinder is applied to the simulator for oil and gas resource exploitation.