Bitumen Froth Slug Injection for Coarse Solid Suspension
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Solution Overview
Problem
Froth pipelines face difficulties in transporting bitumen froth with high coarse solids content due to settling issues, leading to restricted flow and reduced production, as existing designs are not equipped to handle particles larger than 180 μm effectively.
Innovation Solution
Injecting a bitumen froth slug with a lower water content and/or temperature into the pipeline to prevent or remove stationary or sliding beds of coarse solids, creating high pressure gradients that suspend or clear the solids, thereby maintaining flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If froth pipeline operates at low velocities to transport bitumen froth, then energy consumption is reduced, but stationary/sliding beds of coarse solids form in the pipeline
Solution Approach 1:
The patent changes the physical parameters of the bitumen froth by adjusting temperature and/or water content to create a denser, more viscous slug that generates sufficient pressure gradient to suspend coarse solids at lower velocities, resolving the contradiction between energy efficiency and flow reliability
Solution Approach 2:
The patent implements periodic injection of modified bitumen froth slugs at intervals (e.g., every 4-24 hours) to periodically clear developing solid beds, allowing the system to operate at low velocities between slugs while maintaining long-term flow continuity
2Reliability
If froth pipeline velocity is increased to prevent coarse solids settling, then solid bed formation is prevented, but energy consumption increases and production costs rise
Solution Approach 1:
Instead of continuously increasing velocity, the patent changes froth parameters (temperature, water content) to create slugs with enhanced suspending capability, achieving flow reliability at lower average velocities and reduced energy consumption
Solution Approach 2:
The patent applies excessive action locally and periodically by injecting slugs with extreme parameter modifications (very low temperature and/or very low water content) only when needed, rather than maintaining excessive velocity continuously, thus reducing overall energy consumption
3Productivity
If conventional bitumen froth is used in the pipeline, then production throughput is maintained, but coarse solids settle and restrict flow
Solution Approach 1:
The patent segments the bitumen froth stream by injecting distinct slugs of modified froth (with different temperature and/or water content) into the continuous flow, creating discrete zones that perform the function of clearing solid beds without disrupting overall production throughput
Solution Approach 2:
The modified bitumen froth slug acts as an intermediary substance that temporarily changes the flow characteristics to suspend and clear coarse solids, then returns to normal operation, mediating between the conflicting requirements of throughput and flow continuity
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 method effectively prevents the formation or clears coarse solid beds within the pipeline, ensuring continuous production by creating localized high pressure gradients using reduced water content and temperature slugs, even in long-distance transport scenarios.
Implementation Method 1
creating high pressure gradients that suspend or clear the solids
Data Source
AI summary
A method for transporting a bitumen froth having coarse solids having a particle size>180 μm through a pipeline is provided comprising injecting into the pipeline a bitumen froth slug having a lower temperature or a lower water content or both that the bitumen froth.