Difficulties and countermeasures for cementing technology of salle gas horizontal well

Abstract:Owing to the low porosity and permeability of shale gas reservoir, fracturing and other measures to increase production need to be taken to connect natural fractures, which require higher quality of cementing. The major challenge for cementing horizontal shale gas wells are analyzed in depth, which is the effect to cementing quality from the concentric degree of the casing down into the hole, effective displacement by oil-based drilling fluid, and large-scale fracturing. The countermeasures of improving the cementing quality for horizontal shale gas wells are proposed from the aspects of effective drifting, casing centering, floating casing cementing technique, high efficiency oil washing fluid, slurry system with elastic toughness. It provides a reference for cementing horizontal wells in shale gas reservoirs.