Pjenocementne kaše u naftnoj industriji

In previous ten years foamed cements have been increasingly used, especially in cementing oil, gas and geothermal wells. Even more, they are being improved daily. Foamed cement is a cement system in which gaseous nitrogen, as the density-reducing medium, is incorporated directly into the base cement slurry to obtain an ultra-lightweight cement slurry. The generation of foamed cement in the field requires a source of gas (a liquid nitrogen vaporizing unit) and a surfactant to stabilize the foam. Properties of foamed cement, application, primary cementing methods, and equipment for preparing foam cement in the field are discussed in this paper