Downhole Flow Control Assembly Sliding Sleeve and Ball Sealer
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Solution Overview
Problem
Current flow control assemblies for downhole operations in wells lack operational flexibility and are costly to install and remove, limiting their effectiveness in controlling fluid flows within and between the casing conduit and the subterranean formation.
Innovation Solution
The flow control assemblies include a housing with an injection conduit and a ball sealer seat, a sliding sleeve that transitions between configurations to control fluid flow, and a retention structure that allows the sleeve to change configurations based on pressure differential and the presence of an isolation ball, enabling selective isolation and fluid flow management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current flow control assemblies are used, then fluid flow control is provided, but operational flexibility is limited and installation/removal costs are high
Solution Approach 1:
The flow control assembly is divided into modular components including a setting tool with a ball sealer and a separate isolation tool with an isolation ball. This segmentation allows independent deployment and retrieval of each component, improving operational flexibility while reducing overall installation and removal costs compared to monolithic assemblies.
Solution Approach 2:
A ball sealer is introduced as an intermediary element that can be deployed through the injection conduit to seal off flow paths. This intermediary mechanism enables flexible flow control without requiring complex mechanical assemblies to be installed and removed, thereby reducing costs while maintaining adaptability.
2Reliability
If flow control assemblies are installed in casing conduit, then fluid flow control is achieved, but the assemblies are costly to install and remove
Solution Approach 1:
The ball sealer and isolation ball can be independently extracted and retrieved through the injection conduit after completing their sealing functions. This extraction capability eliminates the need to retrieve entire complex assemblies, significantly reducing removal costs while maintaining reliable fluid flow control throughout the operation.
Solution Approach 2:
The ball sealers and isolation balls are designed as simple, low-cost components that can be deployed and retrieved multiple times. These inexpensive elements replace costly complex mechanical assemblies, providing reliable flow control at reduced installation and removal costs.
3Ease of operation
If sliding sleeve transitions between configurations, then precise fluid flow control is achieved, but device complexity increases
Solution Approach 1:
The sliding sleeve is designed to dynamically transition between different configurations based on operational requirements. This dynamic adaptability allows precise control of fluid flow paths without requiring a completely complex mechanical structure, as the sleeve simply moves to predetermined positions rather than incorporating multiple moving parts.
Solution Approach 2:
The sliding sleeve serves multiple functions through its different configurations - it can control flow through the injection conduit, isolate different sections of the well, and work in conjunction with both the ball sealer and isolation ball. This multi-functionality reduces the need for separate specialized components, thereby controlling overall device complexity while achieving precise flow 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
This solution provides enhanced operational flexibility and cost-effectiveness by allowing precise control of fluid flows, improving the efficiency of downhole operations such as stimulation and isolation, while reducing installation and removal costs.
Implementation Method 1
a pressure differential across the isolation ball is greater than a threshold pressure differential
Implementation Method 2
a ball sealer to restrict fluid flow from the casing conduit through the injection conduit
Data Source
AI summary
Flow control assemblies comprise a housing that includes a housing body that defines a housing conduit, an injection conduit that extends through the housing body, and a ball sealer seat. The ball sealer seat defines a portion of the injection conduit, is defined on an inner surface of the housing, and is sized to receive a ball sealer to restrict fluid flow from the casing conduit through the injection conduit. The flow control assemblies further include a sliding sleeve that is located within the housing conduit and defines an isolation ball seat. The flow control assemblies also include a retention structure that is configured to retain the sliding sleeve in a first configuration and to selectively permit the sliding sleeve to transition from the first configuration to a second configuration.