| 摘要 |
The present invention provides a phosphonate-containing polymer and use thereof and a phosphonate-containing polymer viscosity reducer for drilling fluid. The phosphonate-containing polymer comprises structural units expressed by formula (1), structural units expressed by formula (2), and structural units expressed by formula (3) and/or structural units expressed by formula (4), wherein, the ratio of the mole number of the structural units expressed by formula (1), mole number of the structural units expressed by formula (2), and total mole number of the structural units expressed by formula (3) and structural units expressed by formula (4) is 10-85:10-75:5-55. The phosphonate-containing polymer still has outstanding viscosity reducing effect after high-temperature aging when it is applied in brine drilling fluids and high-density drilling fluids.; |
| 主权项 |
1. A phosphonate-containing polymer, comprising structural units expressed by formula (1), structural units expressed by formula (2), and structural units expressed by formula (3) and/or structural units expressed by formula (4), wherein, a ratio of a mole number of the structural units expressed by formula (1), a mole number of the structural units expressed by formula (2), and a total mole number of the structural units expressed by formula (3) and structural units expressed by formula (4) is 10-85:10-75:5-55; wherein, R1 and R2 are H, R3 isR7 is H, C1-C5 linear or branched alkyl or —COOM3, R8 is H, C1-C5 linear or branched alkyl or —RCOOM4, R is C1-C3 linear or branched alkylidene, M1-M4 are H or an alkali metal element respectively, and R9 and R10 are a bond or C1-C3 linear or branched alkylidene respectively, and
wherein R4 and R5 are H, X and R6 are a bond, M1 is Na; or R4 and R5 are H, X is a bond, R6 isM1 is Na; or R4 and R5 are H, X is a bond, R6 is methylene, and M1 is Na. |
