In well cementing operation,a certain amount of spacer needs to be pumped into the wellbore before injecting cement slurries.In offshore well cementing,the preparation of spacer requires heavy manual labor,and the labor intensity is quite high,resulting in low operation efficiency and poor control on the quantities of the spacer additives.To solve this problem,liquid additives are used to replace the solids additives in formulating the spacer,and the liquid additives are added through the additive addition system LAS.Using this technique,the traditional heavy physical labor in formulating a spacer is replaced with intelligent operation,the labor intensity is lowered,the efficiency of well cementing operation is increased,and the labor costs are reduced.A liquid spacer additive C-S70L is prepared through inverse emulsion polymerization.Using C-S70L as the core additive,a spacer suitable for injection using the LAS is formulated.This spacer can be used in temperature range of 20-120℃ and density range of 1.30-1.70 g/cm3.It has good suspending stability(no settling after hot rolling),a rheology that is easy to adjust,a fluid loss that is controllable and good compatibility.
Well cementingCompatibilitySettling stabilitySpacerLASInverse emulsion polymerization
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