| 内容提要: |
Fluid loss additive (FLA), an important type of
admixture, was widely used in well cement to prevent mud filtrate entering the
formation. In this study, a novel sustained-release-type fluid loss additive
was synthesized by means of intercalation reaction between anionic type fluid
loss additive and calcium/aluminum type Layered Double Hydroxide (LDH). Through
the comparison experiment, it was found that in seawater mixing conditions,
this composite material with slow-release function could effectively improve
the controlling loss of water and retention fluidity performance of cement
slurries. Taken together, these advantages opened the possibility to conquer
the negative effect of metal salt ions present in seawater, therefore, this
hybrid materials might meet various practical demands of offshore well cement. |