| abstract |
The present invention relates to the use of a block polymer as a filtrate control agent in a fluid injected under pressure into an oil rock, where: the fluid comprises solid particles and/or is contacted with solid particles within petroleum rock following its injection, the polymer comprising at least three blocks, including: - at least a first block which is adsorbed, preferably irreversibly, on at least part of the particles (p); and - at least one second block (B), of composition distinct from that of said first block, and of weight-average molecular mass greater than 10,000 g/mol and soluble in the fluid (F). - at least one third block of type (A) or type (B). |