Reverse Circulation Well Tool Sleeve Valve
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Solution Overview
Problem
Conventional well circulation systems face challenges such as fluid loss, well kicks, and loss of circulation during drilling operations, which can lead to high pressure risks and inefficient drilling due to restricted flow rates and the need for heavy mud weights, and current solutions like drop-ball plugs are limited in flow control and require lengthy procedures.
Innovation Solution
A reverse circulation well tool with a flow crossover sub that includes a tubular housing with separate flow chambers and a sleeve valve, allowing selective control of fluid flow between the annulus and the drill string's central bore, utilizing hydraulic pressure to open and close flow ports and a sealing structure to manage fluid flow and pressure, enabling efficient drilling and well control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional circulation systems use heavy mud weights to prevent fluid loss and well kicks, then well control is improved, but drilling efficiency deteriorates due to high surface pump pressure requirements
Solution Approach 1:
The circulation system is segmented into multiple flow chambers (first flow chamber for annulus to central bore flow, second flow chamber for central bore to annulus flow) with separate control mechanisms. This allows independent control of different flow paths, enabling the system to maintain well control with lighter mud weights while improving drilling efficiency through optimized fluid circulation.
Solution Approach 2:
The system employs dynamically controllable sleeve valves that can switch between open and closed positions based on real-time well conditions. The sleeve valve in the first flow chamber controls annulus to central bore flow, while the sleeve valve in the second flow chamber controls central bore to annulus flow. This dynamic control allows the system to adapt to varying well conditions and optimize both well control and drilling efficiency.
2Reliability
If drop-ball plugs are used to control fluid flow, then well control capability is improved, but operational complexity increases due to lengthy procedures
Solution Approach 1:
The circulation system performs self-service through automatically actuating sleeve valves that respond to well conditions without requiring manual intervention or complex drop-ball procedures. The sleeve valves are positioned and controlled to automatically switch flow paths based on pressure differentials and well kick conditions, eliminating lengthy operational procedures while maintaining well control capability.
Solution Approach 2:
The system replaces the mechanical drop-ball plug mechanism with a hydraulic control system using sleeve valves actuated by fluid pressure differentials. This substitution eliminates the need for manual ball dropping and complex mechanical procedures, simplifying operation while maintaining or improving well control capability through hydraulic actuation.
3Stress or pressure
If conventional circulation systems use restricted flow rates to manage pressure, then pressure control is improved, but drilling productivity deteriorates
Solution Approach 1:
The circulation system divides the flow control into separate chambers with independent sleeve valves. The first flow chamber handles annulus to central bore flow with its own sleeve valve, while the second flow chamber handles central bore to annulus flow with its own sleeve valve. This segmentation allows optimized flow rates in each chamber, enabling better pressure control while maintaining high drilling productivity through efficient fluid circulation.
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 reverse circulation system enhances drilling efficiency by reducing surface pump pressure, allowing lighter mud weights, faster well control during kicks, and effective handling of severe loss circulation issues, while maintaining a physical barrier to fluid flow when pumps are off, thus improving drilling operations and reducing risks.
Implementation Method 1
selectively movable between a first, closed position and a second, open position in response to a fluid pressure in the first flow chamber or second flow chamber
Implementation Method 2
a sealing structure circumscribing a portion of the substantially tubular housing and including a sealing element, the sealing element configured to seal against a wellbore wall of the wellbore
Implementation Method 3
a biasing element between the sleeve valve and the tubular housing to bias the sleeve valve toward the first, closed position
Data Source
AI summary
A crossover sub includes a tubular housing connected to a drill string in a wellbore, a sealing structure to seal against a wellbore wall, and a sleeve valve disposed within the housing and movable between a closed position and an open position in response to a fluid pressure in a first flow chamber or second, separate flow chamber of the housing. The first flow chamber fluidly connects an upper annulus of the wellbore to a central bore of the drill string downhole of the crossover sub. The second flow chamber fluidly connects a central bore of the drill string uphole of the sealing structure to a lower annulus of the wellbore. The sleeve valve closes the second flow chamber in response to the sleeve valve being in the closed position, and opens the second flow chamber in response to the sleeve valve being in the open position.