Case Study Tullow Ghana Improves Deepwater Zonal Isolation
CemFIT Shield cement system eliminates mud channeling in highly permeable sandstone reservoirs.
CemFIT Shield
Mud-sealing cement system
Improve cement bond logs and maximize zonal isolation
At the technical limits of drilling fluid removal, cement bond quality and hydraulic isolation can be compromised by leaving channels behind the casing. This is particularly problematic in wells where differential pressures may promote interzonal fluid communication.
To avoid these problems, the CemFIT Shield system interacts with any remaining NAF to reduce its mobility and the likelihood of communication along channels.
Use conventional equipment and designs
CemFIT Shield system is compatible with conventional cements, additives, equipment, and designs, enabling simple blending, mixing, and pumping for most field applications. It can be designed for densities from 12 to 18 lbm/galUS [1.44 to 2.16 g/cm3] and temperatures up to 340 degF [171 degC].
CemFIT Shield system improves zonal isolation by reacting with nonaqueous fluid (NAF) left in the well after cementing to limit its mobility and improve resistance to fluid flow in channels. Dynamic rheometry results indicate CemFIT Shield system significantly increases the yield point in the mud channel.
CemFIT Shield
Mud-sealing cement system
