Stimulation Valve Ball Sealer Zone Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for stimulating hydrocarbon production, such as fracturing and acidizing, face challenges in controlling fluid flow and isolating zones effectively, leading to inefficiencies and increased costs due to the use of ball-drop valves and plugs, which can restrict hydrocarbon flow and require time-consuming operations like drilling out seats and plugs.
Innovation Solution
The use of stimulation valves with ball sealers that are pumped through the tubular assembly to shut off fluid flow by seating on ports, allowing for controlled fracturing and stimulation without the need for ball seats or plugs, enabling more precise control over fluid distribution and reducing the complexity of multi-stage fracturing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ball-drop valves and plugs are used to isolate zones during stimulation, then fluid flow control is achieved, but hydrocarbon flow is restricted and time-consuming operations like drilling out seats and plugs are required
Solution Approach 1:
The tubular assembly is divided into multiple isolated zones using expandable packers that can be deployed independently in each zone, allowing stimulation of one zone without affecting others while maintaining full hydrocarbon flow capability when packers are collapsed
Solution Approach 2:
The packers transition from a collapsed low-profile state during normal production (allowing unrestricted hydrocarbon flow) to an expanded state during stimulation operations (providing zone isolation), and can be re-collapsed afterward to restore full flow capability, making the system dynamically adaptable to operational needs
2Ease of operation
If ball-drop valves and plugs are used for multi-stage fracturing, then fluid distribution control is improved, but device complexity increases due to the need for ball seats and multiple plugs
Solution Approach 1:
The expandable packers serve multiple functions: they provide zone isolation during stimulation, act as flow diverters to control fluid distribution to different zones, and can be re-collapsed to restore full hydrocarbon flow, eliminating the need for separate ball-drop valves and plugs
Solution Approach 2:
The complex ball seat mechanisms and multiple plugs are extracted from the system and replaced with simpler expandable packers that achieve the same zone isolation and fluid control functions through radial expansion rather than axial ball-drop mechanisms
3Productivity
If drilling out ball seats and plugs is performed to restore flow, then hydrocarbon production is recovered, but time and operational costs increase
Solution Approach 1:
The packers are designed to be temporarily deployed for stimulation operations and then re-collapsed and discarded from the isolation function, allowing natural hydrocarbon flow to resume without requiring drilling out or removal operations, as the packers simply return to their collapsed state after serving their purpose
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 approach enhances the control over fluid flow and reduces the need for costly and time-consuming operations like drilling out ball seats, improving the efficiency and flexibility of hydrocarbon production stimulation by allowing for selective zone stimulation and easier well maintenance.
Implementation Method 1
The ball sealers are carried by the fluid into the conduit of the stimulation valve where the flow of the fluid through the ports causes the ball sealers to be received in the ports and shut off flow of the fluid through the ports
Implementation Method 2
introducing a plurality of the ball sealers into the fluid being pumped through the tubular assembly. The ball sealers are carried by the fluid into the conduit of the stimulation valve where the flow of the fluid through the ports causes the ball sealers to be received in the ports and shut off flow of the fluid through the ports
Data Source
AI summary
Methods of controlling flow into a formation through the use of a stimulation valve in a tubular assembly installed in a well. Fluid is pumped into the formation through one or more ports in the stimulation valve. The stimulation valve defines a conduit for flow of fluids through the stimulation valve. The ports are adapted to allow flow of fluids between the conduit and the exterior of the stimulation valve and to receive a ball sealer for shutting off flow of fluids through the ports. The ports then are closed by introducing a plurality of ball sealers into the fluid. The fluid carries the ball sealers into the valve where they seat on and shut off flow of the fluid through the ports.