| abstract |
The invention provides a fluid loss agent and a preparation method and application thereof. The preparation method comprises the following steps: mixing polyether macromonomer, 2-acrylamido-2-methylpropanesulfonic acid, N,N-dimethylene Acrylamide, dibasic unsaturated carboxylic acid are mixed with water, and stirred to generate an aqueous monomer solution; adjust the pH of the aqueous monomer solution to 6-7, heat the aqueous monomer solution to 50-70 °C, add an aqueous initiator solution and The reaction is carried out for 2 to 5 hours to obtain the fluid loss reducer; the polyether macromonomer, 2-acrylamido-2-methylpropanesulfonic acid, N,N-dimethylacrylamide, divalent unsaturated carboxyl The mass ratio of the acid is (3-15):(35-90):(5-40):(2-10). The fluid loss agent of the invention can obviously improve the initial rheological properties of cement slurry and improve the early compressive strength of cement stone, thereby effectively improving the cementing quality of oil and gas wells when developing oil and gas wells. |