Acid-Based Gas Hydrate Dissolving Solution for Pipeline Blockages
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Solution Overview
Problem
The formation of gas hydrates in pipelines during natural gas production poses a significant challenge due to their insolubility and crystalline structure, leading to blockages that can cause operational issues and safety concerns, particularly in low-temperature environments, and conventional methods using methanol are costly and pose safety risks.
Innovation Solution
A gas hydrate dissolving solution comprising sodium nitrite, ammonium chloride, a strong acid, and a weak organic acid is introduced into the pipeline to generate heat and dissolve gas hydrates, with the strong acid expediting reaction completion and the organic acid allowing for controlled heat generation to prevent premature heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If methanol is used to dissolve gas hydrates, then gas hydrate dissolution is achieved, but safety problems and costs increase
Solution Approach 1:
The patent replaces methanol with a disposable acid-based dissolving solution that can be injected into the pipeline, allowed to react and dissolve hydrates, and then flushed away. The solution components (acids, salts) are inexpensive and can be disposed of after use, eliminating the need for costly recovery and recycling of methanol while maintaining effective hydrate dissolution.
Solution Approach 2:
The patent changes the chemical parameters of the dissolving solution by using acid-based chemistry (HCl, H2SO4, HNO3) combined with specific salts (CaCl2, MgCl2, NaCl) in controlled concentrations and temperature ranges (0-100°C). This parameter change creates an alternative chemical mechanism for hydrate dissolution that avoids the safety issues of methanol while achieving the same technical effect.
2Reliability
If methanol is used to dissolve gas hydrates, then gas hydrate dissolution is achieved, but storage and logistics requirements increase
Solution Approach 1:
The acid-based solution is designed to be used in-situ and disposed of after a single use. The chemicals are inexpensive enough that large storage tanks for recycling and recovery are not needed. The solution is prepared, injected into the pipeline to dissolve hydrates, and then flushed away without requiring extensive storage infrastructure.
Solution Approach 2:
The patent extracts the water from the hydrate structure through acid-salt solution penetration and dissolution, separating the hydrate into its component parts (water, gas, and dissolved salts). This extraction mechanism eliminates the need for large volumes of methanol storage and recycling infrastructure that would be required to maintain a closed-loop system.
3Productivity
If strong acid is used in the dissolving solution, then reaction completion is accelerated, but heat generation becomes premature
Solution Approach 1:
The patent applies preliminary action by injecting the acid and salt solutions separately or in a controlled sequence. The salt solution may be injected first to begin the dissolution process, followed by the acid solution to accelerate completion. This staged approach allows the reaction to progress gradually rather than generating excessive heat immediately, preventing premature thermal effects while still achieving fast overall reaction completion.
Solution Approach 2:
The dissolving solution is segmented into multiple components (different acids and salts) that can be injected in separate stages or mixed in controlled proportions. This segmentation allows the reaction kinetics to be controlled - the salt solution initiates dissolution while the acid component accelerates it, distributing the heat generation over time rather than all at once, thus preventing premature overheating while maintaining high productivity.
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 dissolves gas hydrates, preventing blockages and reducing safety and logistical concerns associated with methanol use, while providing a cost-effective alternative for maintaining pipeline integrity.
Implementation Method 1
The gas hydrate dissolving solution described in this disclosure generates heat that is used to dissolve the gas hydrate
Data Source
AI summary
A method of dissolving a gas hydrate in a pipeline includes introducing a gas hydrate dissolving solution into the pipeline and allowing the gas hydrate dissolving solution to at least partially dissolve the gas hydrate in the pipeline. The gas hydrate dissolving solution includes a strong acid and a weak organic acid, and the strong acid expedites the reaction.