Centum

In oil and gas well cementing, Portland cement systems are designed for temperatures ranging from below freezing to 662 oF by adding various high-performing cement additives. In the presence of such additives, the cement can sustain pressures ranging from ambient to 30,000 psi in deep wells. Various additives are available on the market to enhance the properties of cement slurries and achieve successful placement between the casing and the geological formation, rapid compressive strength development, and adequate zonal isolation during the lifetime of a well. Performance additives are commonly added to cement formulations to disperse cement particles, modify the setting time under temperature and pressure conditions in the well, control filtration losses of the liquid from the cement slurry during and after placement, compensate for shrinkage of the cement, improve interfacial bonding between cement and casing, and control influx and migration of formation fluids into the cement column during setting.

Fluid loss control additives are also added to maintain a constant water/solid ratio in cement slurries downhole by controlling the rate of water loss to adjacent permeable zones and maintaining a suitable viscosity to prevent cement slurry loss. The filter loss may be static or dynamic, and if sufficient water is lost, the cement either produces non-strengthening filter cake-type deposits, or it may flash set. Typical fluid loss controllers are polyacrylamide, polyethyleneamines, carboxymethyl hydroxyethyl cellulose (CMHEC), and hydroxyethyl cellulose (HEC).

Fluid loss control additives are also used in well-cement compositions to reduce the fluid loss from the cement compositions to permeable formations or zones into or through which the cement compositions are pumped. In primary cementing, the loss of fluid, that is, water, to permeable subterranean formations or zones can result in premature gelation of the cement composition whereby bridging of the annular space between the permeable formation or zone and the pipe string being cemented therein prevents the cement composition from being placed over the entire length of the annulus. Centum scientists and engineers have been studying and researching the described issues, and to address such issues, we have developed the most effective cementing additive blend that offers ultimate performance during onshore and offshore drilling operations.

DuraSeal

DuraSeal is Centum’s latest innovation intended for onshore and offshore oil and gas well cementing operations. Our scientists and engineers have invested significant time in the lab test and evaluate performance offered by various commercially available additives intended for well-cementing. After years of research, development, and testing, we have formulated and engineered DuraSeal. This ultimate onshore and offshore well-cementing additive blend offers advanced-level cementing performance in challenging underground environments. DuraSeal is lab-tested and has proven its performance capacity. It is a blend of advanced additives and sustainable formulation. The selected ingredients for the formulation are readily and ultimately biodegradable, help to meet ESG targets, and do not contaminate underground ecosystems. Centum’s DuraSeal formulation is custom-engineered to meet specific well-cementing operations and helps significantly cut cementing operation costs.

Advantage:

Provide ultimate cement hydration performance during well-cementing operation.
Offer low and high-temperature workability during challenging cementing operations.
Completed cementing work can sustain above 30,000 psi well pressure.
Helps to maintain uniform workability throughout the cementing operations.
Helps to achieve rapid post-cementing compression strength.
Provide ultimate post-cementing zonal isolation.
Helps to prevent filtration loss at the formation during cementing work.
Offer minimum post-completion shrinkage.
Ultimate interfacial bonding between cement work and casing.
Helps to maintain a constant water/solid ratio throughout the cementing operation.
Prevent modification of the slurry properties and its rheology throughout the cementing operation.