| abstract |
The invention relates to the field of oil and gas drilling, in particular to a fluid loss reducer, a preparation method and application thereof, and a water-based drilling fluid and application thereof. The fluid loss reducer contains a structural unit represented by formula (1), a structural unit represented by formula (2) and a structural unit represented by formula (3), wherein, the structural unit represented by formula (1), the structural unit represented by formula ( The molar ratio of the structural unit shown in 2) to the structural unit shown in formula (3) is 1:0.1-0.6:0.2-1, and the weight average molecular weight of the fluid loss reducer is 150,000-900,000g/mol. By using the fluid loss reducer of the present invention in the water-based drilling fluid, the resulting water-based drilling fluid can have good temperature resistance and salt resistance, high plugging performance, and low fluid loss. |