Annular Flow Control Device for SAGD Steam Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current flow control devices in wellbores often fail to deliver consistent heat flow and pressure distribution, leading to inefficient steam injection and production in subterranean formations, particularly in steam assisted gravity drainage (SAGD) operations, where steam and water distribution is uneven due to gravity and fluid properties.
Innovation Solution
The use of annular flow control devices with an inner and outer shroud, radially offset to create a channel that restricts fluid flow and maintains a consistent pressure drop, ensuring uniform distribution of steam and water along the wellbore, utilizing features like dimples, fluidic diodes, and porous media to enhance flow path length and pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If standard flow control devices are used to regulate steam injection, then injection rates can be controlled, but steam and water distribution becomes uneven along the wellbore due to gravity and fluid properties
Solution Approach 1:
The flow control device is divided into multiple flow channels (e.g., upper and lower flow channels) that are distributed around the circumference of the work string. Each channel independently controls fluid flow to specific zones, ensuring uniform distribution of steam and water along the wellbore length rather than concentrated injection at single points
Solution Approach 2:
Different portions of the flow control device have different properties - upper flow channels are positioned to deliver steam while lower flow channels deliver water, with each channel having specific flow restriction characteristics tailored to its location and function, creating locally optimized flow patterns that achieve overall uniformity
2Use of energy by moving object
If flow control devices expel steam at one point and water at another point, then gravity effects are utilized, but consistent heat flow and pressure distribution along the wellbore cannot be achieved
Solution Approach 1:
The device segments the flow into multiple channels distributed circumferentially and axially, with each channel maintaining similar pressure drops. This segmentation ensures that heat flow is delivered uniformly along the wellbore rather than concentrated at single injection points, achieving consistent thermal stimulation
Solution Approach 2:
The flow control device is designed to create equipotential conditions by ensuring that all flow channels experience similar pressure drops despite their different positions. This is achieved through careful design of flow restrictions in each channel to compensate for gravitational and frictional effects, resulting in uniform pressure distribution and heat flow delivery along the wellbore
3Ease of operation
If simple on/off valves or metered valves are used as gatekeepers, then injection rates can be regulated over a continuum, but the devices are non-discriminating for different types of fluids
Solution Approach 1:
Different flow channels are designed with different properties to discriminate between fluid types. Upper flow channels are positioned and dimensioned to preferentially pass steam, while lower flow channels are designed to preferentially pass water. This local differentiation allows the device to automatically separate and control different fluid types without complex valve mechanisms
Solution Approach 2:
The device segments fluid flow paths into distinct channels that are non-discriminating in terms of complexity but discriminating in terms of fluid type handling. Each channel is simple in structure but collectively they provide sophisticated fluid type discrimination and separate control, achieving versatility without sacrificing ease of operation
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 achieves uniform steam flow and pressure distribution, improving the efficiency of hydrocarbon recovery by ensuring consistent heat delivery and fluid distribution, thereby optimizing the injection and production processes in SAGD operations.
Implementation Method 1
configured to restrict a flow rate of a fluid
Implementation Method 2
channel being in fluid communication with at least one of the one or more flow ports and configured to restrict a flow rate
Data Source
AI summary
A flow control device includes an annular inner shroud coupled to a work string that defines one or more flow ports therein, and an annular outer shroud also coupled to the work string and radially offset from the inner shroud such that a channel is defined between at least a portion of the inner and outer shrouds. The channel is in fluid communication with at least one of the one or more flow ports and configured to restrict a flow rate of a fluid. The work string has a central axis and the inner and outer shrouds extend longitudinally within the work string.