| 摘要 |
<p>A fluid loss additive and method are shown for use in cementing oil and gas well bores which comprises the reaction product of a polyamine compound and a high molecular weight sulfonated polymer. The polyamine and high molecular weight sulfonated polymer are prereacted in solution and dried to form a dry product which can be added to the dry cement blend on the shelf or added to the mixing water during the formation of the cement slurry at the well site. The prereacted additive is effective to control fluid loss in cement slurries at 350.degree.F and higher.</p> |
