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- W7071907 abstract "Gas migration during cementing operations can be eliminated with optimal drilling practices and ultra-high filtrate loss drilling fluids or properly designed squeeze fluids. A method based on the flushed zone theory involves squeezing fluid into a potential gas-bearing formation to reduce the permeability to gas near the well bore. The process aims to suppress gas flow long enough for the cement to set. The process is accomplished in the following way: the well is drilled to a predetermined depth and all inhibited drilling fluids in the well are displaced by an appropriate squeeze fluid. The annulus is packed off and pressure is applied down the drill pipe. The volume of squeeze fluid pumped away is monitored, and the flush volume is estimated based on assumed permeability, porosity, and interval height. Once the squeeze fluid volume is pumped away, the remaining fluid is displaced back to surface with the original mud system. Drilling resumes, and the well is drilled to total depth, logged, and then abandoned or cased. As the hydrostatic pressure imposed by liquid cement decreases as a function of gel strength development, the altered permeability of adjacent gas-bearing intervals precludes gas movement into the setting cement. The concept behindmore » the flushed zone theory is basic: the gas is moved radially away from the well bore face, and because the formation's permeability to gas changes, the gas is kept away at least long enough to drill, log, and case the zone. Because the residual effects of reduced permeability to gas are unknown, cement permeability to gas in itself may play an important role in long-term solutions to controlling migrating gases through micro-annuli.« less" @default.
- W7071907 created "2016-06-24" @default.
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- W7071907 date "1993-08-16" @default.
- W7071907 modified "2023-09-26" @default.
- W7071907 title "Flushed zone process helps control gas migration in primary cementing" @default.
- W7071907 hasPublicationYear "1993" @default.
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