| abstract |
The present invention relates to a polymer particle, a manufacturing method therefor, and the use thereof as a well wall reinforcement material, etc. The polymer particle comprises a polyhydroxy polymer, water, and a cross-linked zwitterionic polymer, wherein, relative to 100 parts by weight of the polymer particle (on a dry basis), the content of the polyhydroxy polymer is 0.05-3 parts by weight. The polymer particle has a suitable particle size, can expand under heating conditions, and can have a low apparent viscosity without affecting the degree of expansion, the heat stability, the particle size, etc. |