an elastomer additive improving elastic properties of heavy weight oil well cement: a laboratory study

The use of elastomer additives to solve the problems in oil well cementing has been investigated inrecent years by several research groups in the petroleum industry. this study includes thelaboratory examination of the effect of elastomer additives on the physical properties of heavyweightoil well cement. in the research process, a candidate well is selected and the properties ofthe cement slurry used in a problematic section of the well are tested in the laboratory. then,elastomer additives are added as an elastic agent and the improvements in the cement slurry andstone properties are studied. this article discusses the problems associated with the conventionalheavy‐weight oil well cement used in the candidate well and reports the detail of theimprovements in cement properties obtained by adding an elastomer additive to the cement slurryformulation as an elastic agent. these properties include cement slurry rheological properties, freewater, fluid loss, thickening time, cement stone elasticity properties, and compressive strength. theelastomer additive increases the yield point and plastic viscosity, but it decreases the free waterand fluid loss of cement slurry. in addition, the cement stone compressive strength decreases;however, there is an optimum concentration of the elastomer additive at which the maximumcompressive strength is reached. moreover, the elasticity properties of the cement stone areimproved and a lower value for the young’s modulus and a higher value for the poisson’s ratio areachieved. the theories supporting the results are discussed in the discussion section. the results ofthis study can be used to optimize the cement slurry design in any given set of conditions