Why Cement Fluid Loss Additives Are Necessary?

Now Fluid Loss Control Agents are recognized in the industry that the quality of cementing jobs has significantly improved. Indeed, it is generally clearly acknowledged that a lack of fluid loss control may be responsible for primary cementing failures, due to excessive density increase or annulus bridging and that formation invasion by cement filtrate may be deleterious to the production. With respect to squeeze-cementing, the problem is to adjust the level of fluid-loss to perforation size and formation nature. However, both for primary and remedial cementing very little have been written to justify the level of fluid loss control really required to achieve a good cement job. To address properly the quantitative evaluation of fluid loss limits compatible with successful cementing operations, two different stages have to be considered, first placement or dynamic stage and then waiting-on-cement or static stage. During the first stage, the slurry is flowing and eroding the cement cake which, after a short transient period, stops growing. In contrast, when the pumping is stopped the cake can grow freely.

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