RCD Locking Pin System for Bearing Assembly
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Solution Overview
Problem
The manual operation of ram mechanisms for locking and unlocking the bearing assembly in rotating control devices (RCDs) during drilling operations is hazardous and time-consuming, posing risks to operators and inefficiencies in the drilling process.
Innovation Solution
The implementation of a locking pin system with movable pins that automatically bias to a locked position using elastic components, allowing for hydraulic or pneumatic actuation to transition between locked and unlocked states, facilitating safe and efficient assembly and disassembly of the bearing assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ram mechanism with internal machine threads and a motor is used to lock the bearing assembly, then the locking function is achieved, but the operation becomes dangerous and time-consuming due to manual actuation requirements
Solution Approach 1:
The locking pin assembly is designed to automatically lock the bearing assembly into the RCD housing without requiring manual intervention. The system uses hydraulic or pneumatic pressure to actuate the locking pins, which then self-engage with the bearing assembly through cam surfaces and retention features, eliminating the need for operators to manually position or secure the locking mechanism
Solution Approach 2:
The patent replaces the traditional manual mechanical threading and locking system with a hydraulic or pneumatic actuation system. This substitution eliminates the need for operators to manually manipulate threaded rods and nuts, instead using fluid pressure to drive the locking pins into position and secure the bearing assembly through mechanical engagement features
2Reliability
If traditional locking mechanisms are used, then the bearing assembly can be secured, but the disassembly process becomes complex and time-consuming
Solution Approach 1:
The locking pin assembly incorporates movable pins that can dynamically transition between locked and unlocked positions. The pins are designed to be actuated by hydraulic or pneumatic pressure, allowing quick engagement and disengagement of the bearing assembly. The cam surfaces and retention features enable the pins to rapidly secure or release the bearing assembly without complex manual manipulation
Solution Approach 2:
The locking mechanism is divided into multiple independent locking pins distributed around the bearing assembly. Each pin can be actuated independently or simultaneously, allowing the system to secure the bearing assembly at multiple points. This segmentation enables parallel actuation, reducing the overall time required for locking and unlocking operations compared to a single centralized locking mechanism
3Device complexity
If manual operation of locking mechanisms is required, then the system structure can be simplified, but operator safety is compromised
Solution Approach 1:
The patent introduces hydraulic or pneumatic fluid pressure as an intermediary between the operator and the locking mechanism. Instead of operators directly manipulating the locking pins, they control the actuation through fluid pressure systems. This intermediary allows the operator to remotely and safely actuate the locking mechanism from a safe position, eliminating direct exposure to moving parts and heavy components
Solution Approach 2:
The locking pin assembly automatically positions and secures itself without requiring operator intervention during the locking process. The hydraulic or pneumatic actuation system drives the pins into position, and the cam surfaces and retention features automatically engage with the bearing assembly, eliminating the need for operators to manually position or secure the locking mechanism
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
This solution enhances safety by eliminating the need for manual operation, reduces operational time, and ensures proper alignment and locking of the bearing assembly, thereby improving drilling efficiency and extending the lifespan of components.
Implementation Method 1
a movable pin operable between a locked position that locks the bearing assembly to the housing, and an unlocked position that unlocks the bearing assembly from the housing
Data Source
AI summary
A rotating control device (RCD) for a drilling operation comprises a housing operable with a blowout preventer, and a bearing assembly operable to be received in the housing, and operable to receive a pipe of a drill string. The RCD comprises a plurality of locking pin assemblies supported by the housing. Each locking pin assembly can comprise a movable pin operable between a locked position that locks the bearing assembly to the housing, and an unlocked position that unlocks the bearing assembly from the housing. An RCD comprises an RCD housing coupled to a blowout preventer, and a bearing assembly received within the RCD housing and comprising a lower sealing element sleeve having a perimeter channel. The system comprises a plurality of locking pin assemblies supported by the RCD housing and operable between a locked position and an unlocked position. The movable pins can be automatically biased to the locked position by elastic elements upon removing fluid pressure from the housing. Associated systems and methods are provided.