Subsea Manifold Scale Removal Using Geothermal Solution Heating
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Solution Overview
Problem
The inefficiency of scale removal treatments in subsea manifolds due to temperature loss from heat exchange with the seabed, leading to suboptimal complexation reactions and reduced treatment efficacy.
Innovation Solution
Utilizing geothermal heating of the exploration reservoir to elevate the temperature of the chemical removal solution to the optimal range for effective complexation reactions in the manifold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical removal solution is pumped into the manifold at ambient temperature, then the treatment can be applied, but the complexation reaction efficiency is reduced due to suboptimal temperature
Solution Approach 1:
The chemical removal solution is heated in advance before being pumped into the manifold, ensuring that the temperature is already optimal for the complexation reaction when it reaches the manifold. This preliminary heating action resolves the contradiction by preparing the solution in advance to avoid temperature-related efficiency losses during the actual treatment process.
Solution Approach 2:
The temperature parameter of the chemical removal solution is changed from ambient temperature to an optimal range (typically 40-60°C) through heating before injection. This parameter change enables the complexation reaction to proceed efficiently, resolving the contradiction between applying the treatment and maintaining optimal reaction conditions.
2Productivity
If the manifold is located deep in the seabed, then the production system can be positioned optimally, but heat exchange with the seabed causes temperature loss
Solution Approach 1:
The chemical solution is heated before injection into the manifold, compensating for the heat loss that will occur during transport through the seabed. This preliminary action ensures that the solution maintains sufficient temperature to drive the complexation reaction effectively, even after accounting for thermal energy loss to the seabed environment.
Solution Approach 2:
The heat exchange with the seabed, which normally causes temperature loss, is compensated by pre-heating the chemical solution. The thermal energy lost to the seabed is offset by the initial heating, converting the harmful heat loss into a manageable parameter that can be controlled through preliminary temperature adjustment.
3Speed
If the complexation reaction temperature is increased to improve reaction speed, then scale removal efficiency increases, but energy consumption increases
Solution Approach 1:
The temperature parameter is optimized to a specific range (40-60°C) that provides sufficient reaction speed while avoiding excessive energy consumption. This parameter optimization resolves the contradiction by finding the optimal balance point where the complexation reaction proceeds efficiently without requiring excessive thermal energy input.
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
Enhances the efficiency and speed of scale removal in subsea manifolds by ensuring the reaction temperature is maintained at an optimal level, reducing treatment time and increasing productivity.
Implementation Method 1
Utilizing geothermal heating of the exploration reservoir to elevate the temperature of the chemical removal solution to the optimal range for effective complexation reactions in the manifold
Implementation Method 2
chemical removal solution to be heated to a temperature that allows the complexation reactions to occur efficiently
Data Source
AI summary
During meeting for planning operations for scale removal and scale inhibitor squeeze treatment in wells, the possibility of the manifold being partially incrusted with scale raised considering the more critical mixture of water produced. The proposed solution is a method of treatment for removing scale from a manifold. Said method uses the geothermal heating of the exploration reservoir to heat a chemical removal solution (50). Heating is required to ensure the temperature is in a range that is also suitable for conducting the removal reaction, since the distance that the solution travels to the manifold (20) e the low temperature of the underwater environment make the reaction occur inefficiently, as in the case of pre-salt.