The invention relates to a water-soluble drag
reducer as well as a preparation method and application thereof. The preparation method is characterized by adding an emulsifier and
solvent oil to a reactor to form an
oil phase, adding a lipophilic
propenyl monomer to the
oil phase, dissolving a hydrophilic
propenyl monomer in water, regulating the pH value to 8-9 to form an aqueous phase, slowly dropping the aqueous phase into the
oil phase, carrying out emulsification while stirring, adding an initiator by times under the condition of introducing
nitrogen, reacting at 30 DEG C for 48 hours, cooling, adding a
polymerization inhibitor so as to obtain an inverse
microemulsion system, and mixing the prepared inverse
microemulsion system with a surfactant so as to obtain the water-soluble drag
reducer. The water-soluble drag
reducer is used in quick water
fracturing fluid to reduce the friction drag of pipelines, reduces the pump power, improves the sand-
carrying capacity of the construction fluid, is suitable for oil and gas exploitation of unconventional
low permeability reservoirs, has good dissolving property and obvious drag reduction effect which can reach 50-70% compared with that of the clear water, and is convenient to use.