The molecular design of emulsifiers for high temperature resistant oil-based drilling fluids is based on the following points:
The main chain adopts C-C single bond structure, because the average bond energy of C-c single bond is 347.3 kJ/mol, which is not suitable for high temperature degradation;
②Introduce hydration groups to adjust the HLB value of the emulsifier and enhance its emulsifying ability;
③ The cross-sectional diameter of the lipophilic group is larger than that of the hydrophilic group; the adsorption capacity on the oil-water interface is strong;
④Oligomeric amide non-ionic emulsifier, the molecule belongs to the trimer surfactant, is a trimer amide emulsifier, this organic amine surfactant can form clay-amine with organic soil The complex structure of the oil-based drilling fluid makes the prepared oil-based drilling fluid have excellent fluid loss wall-building performance, which is characterized by low high-temperature and high-pressure fluid loss;
Moreover, the complex structure of this clay-amine can enhance the gel strength of the system, thus giving the system Excellent rheological properties, characterized by low viscosity and high shear.
Due to its special molecular structure, when the high-performance emulsifier molecules gather and adsorb at the oil-water interface, there are in tramolecular interactions between alkyl chains and molecules formed by hydrogen bonds.
The interaction between them greatly improves its ability to construct and stabilize water-in-oil emulsions. In addition, the molecule is a non-ionic emulsifier and has good compatibility with other treatment agents.
Using the surfactant as the primary emulsifier and sodium dodecylbenzenesulfonate as the secondary emulsifier can better emulsify white oil and improve the stability of oil-based drilling fluid.
More High-performance emulsifier details, please contact Millennium Energy.
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