Abstract
Abstract Experience of using the foamed cement technology for difficult lost circulation control at Perm Krai fields (Russia) was summarized. Properties of foamed cement material and results of its applications were shown. Effectiveness of the foamed cement technology for difficult lost circulation control was estimated. Geological factors, which decrease effectiveness of the foamed cement lost circulation control technology, were investigated. Different techniques of foaming base material were investigated and the optimal conditions for the application of these techniques were identified and described. The effect of applying spacers on the technology efficiency was analyzed. Oil-base mud environments were investigated especially. The foamed cement material is intended for a lost circulation control: –for rocks of any lithology;–for rocks with fractures and secondary cavities formed along fractures, with effective disclosure to 2 cm;–for the intensity loss of circulation to 100 m3/h;–for the low static level of the drilling fluid;–for BHST from 0 to 40 °C;–for the vertical depth of the lost circulation zone up to 3000 m; The foamed cement material is not intended for a lost circulation control in the high intensity flow of brine waters. Effectiveness of the foamed cement technology for lost circulation control is 80%. The density of the foamed cement material can be adjusted within a wide range, but some geological conditions require application of the same material without foaming. The optimal technique for foaming base cement material in the field is the ejecting pressurized air or nitrogen. The most efficiency of application the foamed cement lost circulation control technology is with using certain volumes special spacers before and after main material. The foamed cement material has several important advantages: adjustable density, energy of pressurized gas and adjustable thixotropy (time of coagulation structure formation).
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