Chemical Services
Chemical Services
BASIC Company considers the cementing additives and materials are significant for oil and gas wells. Chemicals are adjusted to improve cement systems, enabling them to carry long-term performance benefits for wells focus to the most challenging conditions such as wide-varying temperature changes, fluctuating formation pressures, and corrosive elements.
Additionally the chemical and mechanical performance of cement solutions are adjusted by blending and mixing in materials, chemicals and additives to remedy the specific challenges of each single well.
This wide selection of chemicals and additives allows the customization of any given slurry so that it is planned for the needs of each well.
Materials, chemicals and additives blended and mixing into slurries at planned concentrations can assist achieve effective zonal isolation by varying slurry performance properties such as.
Thickening time:
Monitoring TT for predicted temperature and pressure conditions.
Fluid loss:
Stopping fluid loss so that the cement slurry holds cement filtrate rather than losing it to the permeable formation in downhole temperature conditions.
Rheology:
Affect the rheology of the slurry: – the resistance to flow and – a decrease in the resistance to flow under pressure.
Free fluid:
Reducing free fluid or minimizing the volume of fluid that separates from suspended particles/solids and collects at the vertical surface on the top of a slurry column or on the high side of a horizontal or highly deviated wellbore.
Compressive Strength:
Succeeding best compressive Strength so that the cement sheath can elasticity stand up to the highest expected axial forces or crush loading exerted against it.
Slurry Density:
The density of the slurry required to resist the flow pressure from the formation without exceeding the fracture gradient of the same.
Slurry Stability:
Producing slurry stability through the uniform and consistent distribution of solids throughout the slurry.
Materials, Chemicals & Additives
Defoamers:
Defoamers (anti-foam additives) can control or prevent bubbling, foaming and air entrainment in cement slurries that may occur during the mixing process.
Dispersants:
The thinning effects of dispersants can support modify slurry rheology for easier mixing and placement. Adding dispersants can lower friction and lower pressure during pumping, enhance turbulent flow at reduced pumping rates, and allow operators to mix densified cement slurries.
Expansion/Bond Improving:
Special additives are available that can enhance the expansive properties of various cements. These additives work by way of crystalline growth or in-situ gas generation. Expansive cements expand slightly after the cement is set. This can help promote bonding integrity between cement and the casing and the formation for zonal isolation throughout the life of the well
Fluid Loss Additives:
The design properties of slurries are significantly influenced by the water content. Thus, slurries that lose water can also be subject to a loss or degradation of design properties.
Fluid loss additives support operators retain the key characteristics of their cement slurries, including viscosity, thickening time, density and compressive strength development.
Free Water Suspension:
Slurry performance can be enhanced with additives that control free water and prevent solids from settling. Free water and suspension additives can assist particles and solids in the slurry to remain suspended.
Latexes:
Gas migration can be adjusted with a cement system that includes latex, stabilizers and dispersants. These latex systems can reduce fluid loss, increase acid resistance, and improve high-temperature suspension properties. Additionally, latexes enhance tensile and flexural strengths of the cement sheath.
Retarders:
Cement setting times can be controlled with retarders. Cement retarders adjust the time when a slurry will set hard, keeping the slurry viscous and pumpable in expected wellbore temperatures and for the amount of time required to place the slurry. Retarders minimize the rate of cement hydration, acting in a manner opposite to that of accelerators.
Spacers and Flush:
One of the keys to positively achieving zonal isolation is preparing the wellbore to receive cement. This is done by using spacers to fully displace drilling fluid from the annulus and condition the casing and annular surface to accept a cement bond. Spacers and flushes are intended to displace drilling fluid from the annulus, leave the casing and formation water-wet (free of oil), and separate drilling fluids from the cement slurry.
Heavy Weight:
Fluid density is one of the main properties of any slurry designs, and directly affects the controlling of hydrostatic pressure of the fluid column. A cement slurry with a too low a density can cause in a kick or even a blowout due to hydrostatic pressure failing to overcome formation pore pressures. Though, a fluid with too high a density may result in damage to the formation if the hydrostatic pressure of the weighted fluid go above the fracture gradient, inducing fractures.
Lightweight:
Lightweight cement can be attained by injection of gas (foamed cement) or by adding low-specific-gravity microspheres or other enhancing additives.
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