Why Use Cement Pulsation?
Cement job design and field job execution may be perfect for a given well, but a physical process that normally occurs during the setting process may cause annular pressure, flow after cementing, and/or loss of zonal isolation. Cement gel strength development traditionally occurs shortly after the cement is put in place. Illustration of the reduction in hydrostatic head that can occur during the cement setting process. The cement, through its bond to the casing and the formation, begins to develop initial strength to support its weight. Because the result of this action is cumulative over the length of the cement column, a significant reduction in hydrostatic pressure may be experienced in deeper sections of the cement column as the cement moves through the transition phase. If the right field conditions are encountered, this loss of hydrostatic head can allow gas migration into the unset cement column. This may result in a channel to surface, or pressure on the annulus. The Cement Pul
