| 摘要 |
<p>A weighting agent composition for use in a cement slurry for downhole operations in a subterranean well, the composition comprising a finely divided solid weighting agent; and a dispersant comprising a sulphonic acid, salt or derivative thereof, the sulphonic acid having the general formula I: -[A(OSOO−M+)-B-A′(OSOO−M+)]n- (I) wherein A and A′are each an aromatic moiety; B is an aliphatic moiety; OSOO−M+ is a solubilising group consisting of sulphonic acid, a salt or derivative thereof; and n is an integer of at least 2. The composition is of particular use in formulating a cement slurry for use in a downhole cementing operation. There is also provided a method of preparing a finely divided weighting agent using the sulphonic acid of formula I, a cement formulation comprising the composition and a method of cementing a subterranean well.</p> |
