Polysaccharide-Fatty Acid Dispersants for Asphaltene Deposition
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Solution Overview
Problem
The precipitation and deposition of asphaltenes during hydrocarbon production and transport cause operational issues such as equipment plugging, pressure loss, and reduced production efficiency, which existing chemical additives fail to adequately address.
Innovation Solution
Compositions and methods involving asphaltene dispersants formed from the reaction of polysaccharides and fatty acid reagents, combined with aromatic solvents, are used to inhibit asphaltene agglomeration and deposition in hydrocarbon fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical additives are used to prevent asphaltene deposition, then asphaltene precipitation is inhibited, but existing additives fail to adequately address deposition problems
Solution Approach 1:
The patent changes the chemical parameters of the dispersant by specifying a molecular weight of at least 4000 Da and a specific chemical structure containing aromatic rings and alkyl chains. This parameter change enables the dispersant to effectively interact with asphaltene molecules, providing adequate deposition prevention that previous additives failed to achieve.
Solution Approach 2:
The dispersant comprises a composite molecular structure combining aromatic rings, alkyl chains, and hydroxyl groups in specific configurations. This composite structure allows the molecule to simultaneously interact with different components of the asphaltene system, enhancing its effectiveness in preventing deposition compared to simpler additive structures.
2Productivity
If dispersants are used to maintain fluid flow, then operational issues are reduced, but fluid composition and viscosity may be affected
Solution Approach 1:
The dispersant's molecular weight parameter (at least 4000 Da) and chemical structure are specifically designed to provide adequate asphaltene coverage without excessive concentration. This allows maintenance of fluid flow and reduced operational issues while minimizing impact on overall fluid composition stability.
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 dispersants effectively prevent asphaltene precipitation and deposition, maintaining fluid flow and reducing operational issues in downhole and topside oilfield applications.
Implementation Method 1
The dispersants effectively prevent asphaltene precipitation and deposition, maintaining fluid flow
Implementation Method 2
asphaltene dispersant that is the product of a reaction between a polysaccharide having at least two sugar subunits and one or more fatty acid reagents
Implementation Method 3
contacting a hydrocarbon fluid with an asphaltene dispersant dissolved in an aromatic solvent
Data Source
AI summary
Compositions may include an asphaltene dispersant that is the product of a reaction between a polysaccharide having at least two sugar subunits and one or more fatty acid reagents, and a petroleum fluid produced from a subterranean formation and containing asphaltenes therein. The asphaltene dispersant may have a molecular weight of at least 4000 Da. Compositions may further include an aromatic solvent. Methods may include contacting a hydrocarbon fluid with an asphaltene dispersant dissolved in an aromatic solvent, wherein the asphaltene dispersant is the product of the reaction of a polysaccharide and one or more fatty acid reagents. Methods may also include contacting a hydrocarbon fluid with an asphaltene, wherein the asphaltene dispersant is the product of the reaction of a polysaccharide and one or more fatty acid reagents and has a molecular weight of at least 4000 Da.