Thermal Load Automatic Valve for SAGD Steam Control

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Solution Overview

Problem

In downhole environments, such as SAGD systems, existing valve systems fail to efficiently manage fluid flow changes due to temperature variations, leading to reduced efficiency and steam breakthrough, which affects hydrocarbon production and distribution.

Innovation Solution

A thermal load-based automatic valve arrangement featuring a temperature-responsive actuator and closure member that automatically adjusts to prevent steam flow in the production direction while allowing flow in the presoak direction, using thermally expandable materials and specific geometries to ensure efficient operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If existing valve systems are used to manage fluid flow, then basic flow control is achieved, but efficiency is reduced and steam breakthrough occurs due to inability to respond to temperature variations

Engineering Contradiction:

Improvehydrocarbon production efficiencyVSAvoidsteam flow control reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The valve system utilizes temperature as a parameter change to automatically control flow direction. The thermal load on the actuator changes in response to steam temperature, triggering automatic valve adjustment to prevent steam breakthrough while maintaining hydrocarbon production efficiency.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces complex electronic control systems with a thermal-mechanical actuator system. The actuator responds directly to thermal load from steam temperature changes, mechanically adjusting the valve position without requiring external power or complex control electronics, thereby improving reliability in downhole environments.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Speed

If manual valve adjustment is used, then flow control is possible, but response time to temperature changes is delayed and operation complexity increases

Engineering Contradiction:

Improvevalve response speed to temperature changesVSAvoidvalve control system complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The valve system is self-regulating through the thermal-mechanical actuator that automatically responds to temperature changes. The actuator uses the thermal energy from the steam itself to drive the valve adjustment, eliminating the need for external control systems, sensors, or manual intervention, thus achieving fast response with minimal complexity.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The thermal-mechanical actuator serves as an intermediary between the steam temperature and the valve position. It translates thermal load changes directly into mechanical valve movement, providing a simple yet effective transmission mechanism that responds instantly to temperature variations without complex control logic.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If valves allow bidirectional flow, then fluid movement flexibility is maintained, but steam breakthrough in production direction cannot be prevented

Engineering Contradiction:

Improvefluid flow direction flexibilityVSAvoidsteam breakthrough in production direction

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The valve system dynamically adjusts its flow control characteristics based on real-time temperature conditions. During presoak operations, the valve allows bidirectional flow for flexibility, but when steam temperature rises and thermal load increases, the actuator automatically adjusts the valve to close the production direction while maintaining presoak capability, thus adapting to operational needs.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The valve design implements different flow control properties for different directions. The seating geometry and actuator positioning create asymmetric flow characteristics that preferentially block steam in the production direction while allowing flow in the presoak direction, providing localized quality control for each flow path.

Inventive Principle:

Principle #3Local quality

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 effectively reduces steam breakthrough, improves steam distribution, and maintains efficient hydrocarbon production by automatically adjusting valve positions based on fluid temperature, ensuring optimal flow conditions in both production and presoak directions.

Implementation Method 1

A thermal load based automatic valve arrangement including an actuator responsive to fluid temperature flowing through the arrangement

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentUS10557328B2Thermal load based automatic valve arrangement and method

Publication Date: 2020.02.11 BAKER HUGHES CO

AI summary

A thermal load based automatic valve arrangement including an actuator responsive to fluid temperature flowing through the arrangement, a closure member operably connected to the actuator, and a seat receptive to the closure member to prevent or restrict fluid flow through the arrangement in a first direction when actuated while still allowing fluid flow in a second direction. A method for controlling steam movement in a production string of a SAGD (Steam Assisted Gravity Drainage) installation including sensing with an actuator, temperature of fluid moving through a valve arrangement, automatically adjusting the valve arrangement pursuant to thermal load on the actuator.