... Abstract Cement plays a vital role in maintaining the long term integrity of oil and gas wells by forming a robust and impermeable barrier and ensuring zonal isolation by restricting the flow of fluids between different geological zones. In-situ thermal stimulation methods such as SAGD place...

... radial fractures or debonding of the cement, thus potentially compromising the zonal isolation. Achieving zonal isolation within these shallow vertical and horizontal wells (90° and 2, 200 ft measured depth [MD]/1, 396 ft true vertical depth [TVD]) and avoiding water communication between zones...

... with zonal isolation required between the Thamama A and B. These wells were expected to exhibit a naturally corrosive environment (e.g. 56, 000 ppm of CO 2 ). To address these challenges, a fit-for-purpose cementing system, suitable for CO 2 and other corrosive fluids, was developed and successfully applied...

... wells that the stage tool in well Ashalchinskoye 241 was leaking on the slant side, potentially creating a surface event. The stage tool leak needed to be plugged off and eliminated. The proposed solution was to pump thermally stable cement with accelerator in two stages to assist in zonal isolation...

.... Various factors have to be considered to select the proper cement for zonal isolation of thermal recovery heavy-oil wells. First the cement should be flexible enough to withstand the stresses which occur when casing expands during the heating up of the well. To reduce these stresses, the cement thermal...