Pilot Block System for Independent BOP Locking
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Solution Overview
Problem
Existing lock systems for blowout preventer (BOP) stacks lack efficient mechanisms to independently lock and unlock multiple BOPs in response to varying pressure conditions, which can lead to unintended movement or failure to secure the BOPs during drilling operations.
Innovation Solution
A lock system that includes a pilot block with pilot-operated check valves along the lock line, actuated via target pressure in the close line, allowing for independent locking and unlocking of BOPs by controlling the flow of hydraulic fluid through the lock and close lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lock system is used to secure BOPs, then safety and operational efficiency are improved, but the system complexity increases due to multiple lock lines and pressure control mechanisms
Solution Approach 1:
A pilot block is introduced as an intermediary component that receives pressure from the close line and uses it to control check valves on the lock line. This mediator allows the close line to indirectly control the lock mechanism, reducing the need for separate independent control systems while maintaining safety functionality.
Solution Approach 2:
The system uses hydraulic pressure transmitted through fluid lines (close line and lock line) to actuate the pilot block and check valves. This hydraulic mechanism enables remote control of the locking function without mechanical linkages, simplifying the physical structure while maintaining reliability.
2Adaptability or versatility
If pilot-operated check valves are used to control locking, then independent locking and unlocking of multiple BOPs is enabled, but the manufacturing complexity increases
Solution Approach 1:
The lock system is divided into modular components: a pilot block, check valves, lock lines, and close lines. Each component can be manufactured and tested independently, then assembled into the complete system. This segmentation facilitates easier manufacturing and assembly while enabling independent control of multiple BOPs.
Solution Approach 2:
The pilot block serves multiple functions: it receives pressure from the close line, controls check valves on the lock line, and enables or disables locking based on pressure conditions. This multi-functionality reduces the need for separate control mechanisms for each BOP, simplifying manufacturing while maintaining adaptability.
3Productivity
If pressure control mechanisms are added to actuate the pilot block, then responsive locking and unlocking is achieved, but the device complexity increases
Solution Approach 1:
The pilot block automatically responds to pressure changes in the close line without requiring external control signals. When pressure is applied to close the BOP, the pilot block self-actuates to control the check valves and lock mechanism. This self-service capability eliminates the need for additional control systems, improving operational efficiency while minimizing added complexity.
Solution Approach 2:
The system uses pressure feedback from the close line to control the locking mechanism. The pressure level in the close line directly influences the state of the pilot block and check valves, creating a feedback loop that automatically adjusts locking based on operational conditions, thereby improving productivity without requiring complex external control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively locks and unlocks BOPs in response to pressure conditions, ensuring the BOPs are securely maintained in their closed positions during drilling operations, thereby enhancing safety and operational efficiency.
Implementation Method 1
pilot-operated check valve across a lock line that fluidly couples a hydraulic fluid source to the lock actuator
Implementation Method 2
providing a locking flow of hydraulic fluid through a lock line and across the pilot block to adjust a lock member of a lock assembly
Data Source
AI summary
A lock system includes a lock assembly for a movable component, a lock line configured to apply pressure to actuate the lock assembly, and a close line configured to apply pressure to close the movable component. The lock system also includes a pilot block with a respective pilot-operated check valve along the lock line, wherein the pilot block is actuated via a respective target pressure in the close line.