Phase-Controlled Well Flow Regulator for Steam Distribution
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Solution Overview
Problem
In subterranean well operations, thermal recovery techniques using steam often result in uneven temperature distribution along the wellbore, leading to 'hot spots' and 'cold spots' that hinder hydrocarbon recovery, as steam bypasses hydrocarbons and causes formation damage.
Innovation Solution
A phase-controlled well flow control device that regulates fluid flow based on the relationship between the phase of the fluid, pressure, and temperature, using an actuator with a variable volume chamber to ensure consistent phase change and distribution of steam, thereby optimizing hydrocarbon recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If steam is injected into the wellbore to heat the formation, then the viscosity of hydrocarbons decreases and recovery becomes easier, but the steam is not evenly distributed resulting in hot spots and cold spots
Solution Approach 1:
The flow control device segments the steam injection process by controlling flow at different depths through a valve mechanism. The valve can be positioned at different locations along the wellbore to divide the injection zone into multiple segments, allowing controlled distribution of steam to eliminate cold spots and achieve more uniform heating throughout the formation.
Solution Approach 2:
The flow control device incorporates a dynamic valve mechanism that can adjust its opening position based on downhole conditions. This dynamic adjustment allows the system to respond to varying temperature and pressure conditions, optimizing steam distribution patterns to prevent both hot spots and cold spots during different stages of the thermal recovery process.
2Productivity
If steam flow rate is increased to improve heating efficiency, then more hydrocarbons are mobilized, but steam breakthrough occurs and formation damage increases
Solution Approach 1:
The flow control device incorporates a feedback mechanism where the valve position is adjusted based on downhole temperature and pressure conditions. This feedback control allows the system to maintain optimal steam flow rates that maximize hydrocarbon recovery while preventing excessive flow that would cause steam breakthrough and formation damage. The valve responds to changing conditions in real-time to balance productivity and formation protection.
Solution Approach 2:
The device changes the flow control parameters dynamically by adjusting valve opening positions at different depths and times. This parameter adjustment allows optimization of steam flow characteristics to match formation conditions, enabling high recovery rates without exceeding the formation's capacity and causing breakthrough or damage.
3Temperature
If a flow control device is added to regulate steam distribution, then temperature distribution improves, but device complexity increases
Solution Approach 1:
The flow control device is designed to operate autonomously using downhole temperature and pressure conditions to control valve positioning. The device self-regulates steam flow distribution without requiring external control systems or complex mechanical actuation mechanisms, achieving improved temperature uniformity while keeping the device complexity manageable through passive 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
The solution ensures more consistent heat application to the formation, reduces formation damage, and improves hydrocarbon recovery by maintaining the fluid in a gaseous phase until production, ensuring efficient steam distribution and reducing steam breakthrough.
Implementation Method 1
an actuator with a substance in a chamber and configured so that a volume of the chamber varies to control actuation of the device, with the substance responding to the pressure and temperature of the fluid flowing through the device
Data Source
AI summary
Phase-controlled well flow control. A well system includes a flow control device which regulates flow of a fluid in the well system, the flow control device being responsive to both pressure and temperature in the well system to regulate flow of the fluid. A flow control device includes a flow regulator for regulating flow of a fluid through the flow control device, and an actuator which is operative to actuate the flow regulator in response to a predetermined relationship between a phase of the fluid and both pressure and temperature exposed to the actuator. A method of controlling a phase change of a fluid in a well system includes the steps of: flowing the fluid through a flow control device in the well system; and adjusting the flow control device in response to both pressure and temperature in the well system.