Research And Application Of Foam Cement Slurry System

More and more deep gas wells&long sealed section wells appeared in daqing Oilfield recentyears, the difficulty faced by the cementing is: Low-pressure layer is prone to loss; gas wells requirea higher anti-channeling properties of the slurry.Usually two methods will be taken: one is use the two stage cementing technology, another isuse floating bead low-density cement, so can to reduce the annulus pressure to solve the problem ofloss.But use the two stage cementing technology, it`s hard to decided where to set the stage collar,also there Exist hidden dangers when cementing; the density of floating bead low-density cement islimited; usually it`s between1.40-1.60g/cm3,the slurry strength is low, also Floating beads sourcesis restricted.In addition, in the two difficult of Leak-proof and anti-channeling, there is no effectivemethods, therefore, Foam-cement slurry research is taken.The content of this subject is through research of the foam slurry preparation technology、bubble stability technology，to determine the conventional density and low-density foam groutprogram.By the research of Regularity of slurry density Changes, research of Foam cement slurryproperties, combination of on-site construction environment and conditions, developed a foamcement slurry technology, to Guide the production practice.Through the study of this topic, Explore a set of foam-cementing slurries preparation andsupporting technology, adaptation of Daqing oil field application to meet the need for cementing.Use this results can effectively solve the loss and channeling problem, enhanced cementingquality and oil recovery, do great significance to improve oil field exploration and developmentefficiency, with the technology, has a positive role in promoting the development of cementingmarket at home and abroad.