Dual-Pipe Steam Pipeline Preheating to Reduce Condensate
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Solution Overview
Problem
The cost and inefficiency of steam generation facilities, along with significant heat loss and condensate formation in long steam pipelines, reduce the economic viability of hydrocarbon recovery processes like SAGD, particularly when steam is delivered over distances exceeding 5 km.
Innovation Solution
A process involving a dual pipe system with cross-over pipes and valve arrangements is used to preheat sections of steam pipes, reducing condensate formation by alternating steam flow through parallel pipes to maintain steam quality and efficiency over long distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If steam is delivered over long distances through single pipelines, then steam generation facilities can serve remote reservoirs, but significant heat loss and condensate formation occur reducing efficiency
Solution Approach 1:
The single pipeline is divided into multiple segments with parallel piping. The system uses multiple pipe runs (first pipe, second pipe, third pipe) connected through cross-over pipes at intermediate points, creating segmented sections that can be independently heated and managed to reduce overall heat loss.
Solution Approach 2:
The system preheats pipeline sections before full steam flow is established. Steam is directed through specific pipe segments in a controlled sequence to warm them beforehand, preventing excessive condensate formation and heat loss when full operation begins.
2Productivity
If steam flow is maintained continuously through long pipelines, then steady steam delivery is achieved, but condensate formation and heat loss increase operational costs
Solution Approach 1:
The system implements periodic cycling of steam flow through different pipe segments. Valves alternately direct steam through first and second pipes, creating periodic heating cycles that prevent continuous condensate accumulation while maintaining overall steady delivery to the reservoir.
Solution Approach 2:
The system drains condensate from low points in the pipeline system and recovers it for return to the steam generation facility. This eliminates the harmful effect of condensate accumulation while recovering the water resource for reuse in steam production.
3Ease of manufacture
If existing steam generation facilities are utilized for multiple reservoirs, then capital costs are reduced, but steam quality degrades over extended transmission distances
Solution Approach 1:
The transmission system is segmented into multiple parallel pipe runs with cross-over connections. This segmentation allows the steam flow to be distributed and managed in sections, maintaining steam quality by preventing excessive heat loss in any single segment while utilizing existing generation facilities.
Solution Approach 2:
Pipeline sections are preheated before full steam delivery begins. This preliminary heating action ensures that when steam from existing facilities reaches distant reservoirs, the pipes are already warm enough to maintain steam quality and minimize condensate formation throughout the extended transmission distance.
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 method maintains steam quality and reduces condensate formation, minimizing operational costs and safety risks, thereby enhancing the economic viability of hydrocarbon recovery by utilizing existing steam generation facilities for multiple reservoirs.
Implementation Method 1
As the steam moves through the pipeline, it is cooled by the surrounding environment, which results in condensation of a portion of the steam into liquid water, also referred to as condensate
Implementation Method 2
heating a first section of a pipeline by directing steam through the first section of the pipeline
Implementation Method 3
directing steam along a first portion of the first pipe and back along a first portion of the second pipe to heat the first portion of the first pipe and the first portion of the second pipe
Data Source
AI summary
A process for providing steam from a steam source to a well located remote from the steam source, includes heating a first portion of a first pipe by directing steam along the first portion of the first pipe that extends along a first segment of a path between the steam source and the well, across a first cross-over pipe, and back to the steam source, along a first portion of a second pipe that extends along the first segment of the path. The process also includes heating a second portion of the first pipe by directing steam along the first portion and the second portion of the first pipe, across a second cross-over pipe, and back to the steam source along a second portion of the second pipe. The first pipe and the second pipe are utilized to transport steam to the well.