Flapper Valve Tool Sliding Sleeve Mechanism
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Solution Overview
Problem
Traditional flapper valves used to prevent pressurized wellbore fluids from entering workstring tubing tend to wear out over time, necessitating a reliable method to maintain the flapper valve in an open position.
Innovation Solution
A downhole tool with a flapper valve assembly and sliding sleeves, where the sleeves can be shifted to interact with the flapper valve, using shear pins and pressure to control the flapper's position between open and closed states, preventing backflow or allowing fluid to flow by deforming to prevent further movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional flapper valves are used to prevent pressurized wellbore fluids from entering workstring tubing, then fluid backflow is prevented, but the flapper valve wears out after a period of use
Solution Approach 1:
The patent extracts the flapper valve from the workstring by placing it in a separate downhole tool that can be independently deployed and retrieved. This allows the flapper valve to be replaced without pulling the entire workstring, extending operational life while maintaining reliability
Solution Approach 2:
The downhole tool is designed to be deployed into the wellbore, perform its function of preventing backflow, and then retrieved or discarded after use. This allows the flapper valve mechanism to be recovered and replaced without affecting the permanent workstring infrastructure
2Productivity
If the flapper valve is maintained in an open position, then fluid flow is allowed, but control over backflow prevention is reduced
Solution Approach 1:
The flapper valve is designed to be dynamically controllable between open and closed positions through the mechanism described in the patent. This allows the system to adapt to different operational requirements, maintaining productivity when flow is needed while ensuring reliability when backflow prevention is critical
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 solution effectively maintains the flapper valve in a reliable open or closed position, preventing backflow or allowing fluid to flow, thereby extending the tool's operational life and maintaining fluid control within the wellbore.
Implementation Method 1
using shear pins and pressure to control the flapper's position between open and closed states
Implementation Method 2
allowing fluid to flow by deforming to prevent further movement
Data Source
AI summary
The present invention is related to a downhole tool having a flapper valve assembly for controlling the backflow of fluid into a tubing string. The downhole tool includes a first sleeve slidably disposable within at least a portion of the flapper valve assembly and the downhole tool. The downhole tool can also include a second sleeve slidably disposed within the downhole tool. The present invention is also related to a method of using the downhole tool. The method includes the step of positioning the downhole tool in a wellbore. Once the downhole tool is positioned in the wellbore, the first sleeve is shifted to interact with the flapper valve assembly.