Mechanically Activated Bypass Valve for Downhole Fluid Diversion
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Solution Overview
Problem
Current bypass valve technologies for oil and gas well operations, such as dual circulation subs and PBL Multiple Activation Bypass Systems, have limitations including irreversible activation, ball capture issues, and time-consuming ball pumping processes, which hinder efficient fluid diversion around downhole tool strings.
Innovation Solution
A mechanically activated bypass valve apparatus (MABV) comprising a top sub, tubular housing, mandrel, mandrel nut, and spring, allowing fluid diversion by applying weight-on-bit to shear screws, enabling axial movement of the mandrel to open and close bypass ports without using balls, and incorporating a spring for shock absorption and consistent weight-on-bit application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dual circulation sub (DCS) is used to bypass flow, then flow can be diverted into the wellbore, but the device can only be activated once and cannot be deactivated
Solution Approach 1:
The bypass valve employs a dynamic mandrel assembly that can move between closed and open positions along the longitudinal axis. The mandrel is connected to a piston that responds to pressure differential across the bypass ports, enabling automatic opening when bypass pressure exceeds a threshold and closing when pressure equalizes, thus providing repeated activation and deactivation capability
Solution Approach 2:
The system incorporates pressure differential feedback through the piston mechanism. When bypass flow creates sufficient pressure differential, the piston moves to open the mandrel and bypass ports. When circulation through the tool string restores pressure balance, the spring returns the mandrel to closed position, providing automatic feedback-based control for repeated operations
2Adaptability or versatility
If a PBL Multiple Activation Bypass System is used, then repeated bypass activation is possible, but balls are captured in a basket preventing further ball circulation to lower devices
Solution Approach 1:
The invention removes the ball capture basket entirely from the system. Instead of capturing balls, the bypass valve uses pressure differential and spring force to automatically control mandrel position. This extraction of the ball-capturing function eliminates the obstruction to ball circulation while maintaining repeated bypass activation capability through pressure-based control
Solution Approach 2:
The system replaces the ball-activated mechanical control mechanism with a pressure-differential-based automatic control system. The piston responds to pressure forces rather than requiring physical ball impact, eliminating the need for ball capture and allowing free circulation of balls to lower activation devices
3Ease of operation
If balls are pumped through pipe or coiled tubing to activate bypass valve, then bypass function can be activated, but the process is very time consuming and costly
Solution Approach 1:
The bypass valve is designed to activate automatically through self-service pressure differential control. When bypass flow is established and pressure differential across the bypass ports exceeds the spring force on the piston, the mandrel automatically opens without requiring external ball activation. This eliminates time-consuming ball pumping operations while maintaining reliable bypass activation
Solution Approach 2:
The system uses hydraulic pressure differential across the bypass ports to drive the piston and mandrel assembly. The pressure forces from the fluid flow itself activate the bypass mechanism, eliminating the need for mechanical ball activation and significantly reducing activation time
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
Enables efficient fluid diversion around downhole tools, reduces operator effort, and prevents damage from stall conditions, while allowing for repeated activation and deactivation without ball interference, improving drilling consistency and reducing operational time.
Implementation Method 1
incorporating a spring for shock absorption and consistent weight-on-bit application
Implementation Method 2
applying weight-on-bit to shear screws, enabling axial movement of the mandrel
Data Source
AI summary
A mechanically activated bypass valve apparatus for allowing fluid being pumped through the pipe or coiled tubing string to be bypassed around a tool string and into the wellbore. Activation of the bypass valve is accomplished by applying weight-on-bit to the apparatus to shear a set of shear screws, allowing the mandrel to move axially relative to the tubular housing. Lowering the pipe string and setting down weigh on bit misaligns fluid bypass ports in the mandrel and housing, thus forcing fluid to continue to flow through the bore of the tool and to the toolstring below the bypass tool. Picking up on the pipe string aligns corresponding ports in the mandrel and housing and allows fluid to flow from the bore of the tool to the wellbore annulus, thus bypassing other tools downhole of the apparatus.