| abstract |
The invention belongs to the technical field of oilfield exploration and development, and in particular relates to a waterproof damage treatment agent and a preparation method and application thereof. The preparation method comprises: (1) ring-opening reaction of 2-alkyl-3-phenyl-acrylic acid and chloroalkyl ethylene oxide in solvent 1 to obtain mixture 1, removing solvent 1 from mixture 1, crystallization and drying to obtain Intermediate product; (2) the above-mentioned intermediate product and N,N-diethylethanolamine react in solvent 2 to obtain mixture 2, remove solvent 2 from mixture 2, crystallize and dry to obtain a waterproof damage treatment agent. The treatment agent has the characteristics of simple synthesis process, can be injected in coordination with fracturing fluid, does not affect the sand-carrying of fracturing fluid, and has the advantages of inhibiting clay expansion and preventing sensitive damage. Under the condition of 200mg/L concentration, the permeability retention rate of low-permeability water-sensitive reservoirs reaches more than 90%, and the clay anti-swelling rate is more than 85%. |