Pressure-Actuated Sliding Sleeves for Water Injector Well Zonal Isolation
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Solution Overview
Problem
Conventional completion techniques for water injector wells face challenges such as limited inner diameters, high complexity and expense, and insufficient sand control, leading to issues with zonal isolation and cross-flow prevention.
Innovation Solution
A completion system featuring a casing string with pressure-actuated sliding sleeves and flow control devices, which includes a pressure control valve, actuator mandrel, and injection pressure communication port to facilitate efficient liquid injection and fracture generation, while providing zonal isolation and preventing solids production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional completion techniques (frac packs, open hole gravel packs, stand alone screen completions) are used, then zonal isolation and sand control are provided, but inner diameter is limited and device complexity increases
Solution Approach 1:
The completion system divides the wellbore into discrete zonal sections using individually addressable sliding sleeves at different depths. Each sliding sleeve can be independently actuated to open or close, allowing selective injection into specific zones without requiring complex pre-installed structures. This segmentation enables sufficient inner diameter while maintaining zonal isolation capability.
Solution Approach 2:
The system employs dynamically controllable sliding sleeves that can transition between closed (isolating) and open (injecting) states based on operational requirements. This dynamic control allows the completion to adapt to different injection scenarios and maintain both large inner diameter and effective zonal isolation without requiring complex static structures.
2Reliability
If frac packs are used for zonal isolation, then zonal isolation is achieved, but expense and complexity increase
Solution Approach 1:
The sliding sleeves are designed to be actuated by injection pressure itself. When injection pressure reaches a certain threshold, it automatically opens the sliding sleeve without requiring external complex actuation systems. This self-service mechanism reduces completion system complexity while maintaining reliable zonal isolation control.
Solution Approach 2:
The system uses hydraulic pressure from the injection fluid to actuate the sliding sleeves. The injection pressure differential automatically controls the opening and closing of sleeves, eliminating the need for complex mechanical or electronic actuation systems. This hydraulic actuation provides reliable zonal isolation with reduced complexity.
3Reliability
If open hole gravel packs are used for zonal isolation, then zonal isolation is achieved, but expense increases due to high differential pressure requirements
Solution Approach 1:
The sliding sleeves are pre-installed in the casing string before cementing, positioned at desired depth intervals. This preliminary placement eliminates the need for expensive post-installation gravel packing operations and high differential pressure treatments. The sleeves are ready to provide zonal isolation immediately upon selective actuation, reducing overall completion cost.
Solution Approach 2:
The system changes the isolation mechanism from relying on high differential pressure across gravel packs to using mechanically controlled sliding sleeves that respond to lower pressure differentials. This parameter change in the isolation mechanism reduces the expense associated with achieving and maintaining zonal isolation.
4Reliability
If stand alone screen completions are used, then sand control is provided, but sand control effectiveness is insufficient
Solution Approach 1:
The system merges sand control screens with zonal isolation sliding sleeves into a single integrated component. The sliding sleeve structure incorporates screen material for sand control while maintaining the mechanical isolation function. This combination provides both sand control and zonal isolation without requiring separate stand-alone screen completions, improving effectiveness while managing complexity.
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 system achieves effective zonal isolation, allows for the deployment of flow control valves, and prevents cross-flow between zones, enhancing the efficiency and reliability of water injector well completions.
Implementation Method 1
The at least one sliding sleeve is pressure actuated
Implementation Method 2
inject liquid from the tubing bore to the formation and generate fractures in the formation
Implementation Method 3
The at least one sliding sleeve and casing are cemented in the wellbore
Data Source
AI summary
A system for completing water injection wells includes an injector well completion system. In an embodiment, an injector well completion system for liquid injection in a formation includes a casing string disposed in a wellbore having a tubing bore. The casing string includes a casing and a sliding sleeve. The sliding sleeve has a pressure control valve having open and closed positions, an actuator mandrel having a flow control device, and an injection pressure communication port. The open position of the pressure control valve actuates the actuator mandrel to align the flow control device and the injection pressure communication port to inject liquid from the tubing bore to the formation and generate fractures in the formation.