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STYBCEM Toughness Anti-Gas Migration Cement Slurry
Introduction
The STYBCEM Toughness Anti-Gas Migration Cement Slurry System is developed to address the challenges of gas migration during the cementing of shale gas wells and the issues encountered during perforation fracturing in later production stages. This system exhibits excellent anti-gas migration properties, effectively preventing gas migration during cementing and waiting-on-cement time, ensuring safety and quality in cementing operations. The high toughness of the cement stone ensures stability and integrity of the cement sheath during enhanced oil recovery operations such as perforation and fracturing, preventing wellhead pressure issues and maintaining shale gas well productivity. The system provides good rheological properties, low fluid loss, adjustable thickening time, stable slurry, and compressive strength to meet cementing operation requirements under varied temperature conditions.
Key Features
Strong Anti-Gas Migration Capability: Effectively prevents gas migration in the cementing process.
High Toughness Cement Stone: Exhibits excellent mechanical properties for stability under operational stresses.
Low Fluid Loss and Short Thickening Transition Time: Ensures efficient cementing operations.
Suitable for Shale Gas Wells and Long Horizontal Sections: Excellent applicability in complex wellbore scenarios.
Applications
Shale Oil and Gas Wells, Long Horizontal Well Cementing: Ideal for cementing operations in shale formations and extended reach wells.
Active Oil and Gas Show Cementing Operations: Effective in wells with dynamic oil and gas shows.
Tight Oil and Gas Requiring Fracturing Completion: Suitable for cementing in conditions requiring enhanced recovery techniques.
System Additives
Fluid Loss Additive (FLO-S): Recommended dosage: 0.7–2% for solid types; 3–8% for liquid types.
Retarder (RET): Adjust dosage as required.
Dispersant (CF44L): Recommended dosage: 0.5–3% for solid types; 0.2–1.5% for liquid types.
Defoamer (DESL): Recommended dosage: 0.2–0.5% for liquid types.
Nano Anti-Gas Migration Agent (MC): Recommended dosage: 0.5–2% for liquid types.
Toughening Agent (GR66L): Recommended dosage: 5–10% for liquid types.
Key Additive Descriptions
Nano Anti-Gas Migration Agent MC
MC is a colloidal solution composed of nano metal oxides processed through pecialized techniques. These metal oxides, with diameters less than 5 nanometers and large specific surface areas, significantly bind the free water in the cement slurry gaps, enhancing stability, reducing permeability, and increasing cement stone strength. MC promotes cement hydration, accelerates C-S-H gel formation, and significantly reduces the timeframe for achieving cement stone strength, thus effectively performing the anti-gas migration function.
Functions:
Shortens the time required for cement slurry to gain strength.
Enhances the microstructure of the cement stone.
Increases the cement stone's gas migration prevention capability.
Toughening Agent GR66L
GR66L is a composite product of emulsion polymers, featuring small spherical polymer particles suspended in an emulsion. The polymer particles in the latex have diameters ranging from 0.05 to 0.5 μm. The latex solution forms a cementitious system with low fluid loss, good rheological properties, anti-gas migration capabilities, and high toughness. It is ideal for cementing small boreholes, sidetracks, and multilateral wells.
Functions:
Provides low fluid loss, good rheology, anti-gas migration, and high toughness.
Improves the microstructure and mechanical properties of the cement stone.
Compatible with density modifiers like microspheres, fly ash, ilmenite powder, and barite powder for various density requirements.
Suitable for use with fresh, seawater, and saline water slurries.
Retarder RET-M
RET-M is synthesized from organic chemical raw materials, ensuring non-toxicity, odorlessness, and no equipment corrosion. RET-M allows for precise adjustment of thickening time based on dosage, maintaining a linear relationship for ease of construction control. It is compatible with other cement additives and does not impair cement stone strength, making it suitable for operations under high salinity conditions.
Functions:
Adjusts cement slurry thickening time, with dosage directly affecting the duration.
Usable temperature range: 30 to 150°C.
Applicable in fresh, seawater, and saline water environments.
HITCEM Ultra-High Temperature Cement Slurry System
Introduction
The HITCEM Ultra-High Temperature Cement Slurry System has been developed in response to the challenging conditions associated with deeper and more complex geological formations encountered in ongoing oil and gas exploration. As drilling depths increase, so do formation temperature and pressure, rendering traditional cement additives and slurry systems ineffective for on-site applications. This system comprises a combination of polymers, high-temperature stabilizers, retarders, dispersants, anti-gas migration agents, and defoamers, suitable for operating temperatures ranging from 170 to 240°C. It features adjustable thickening times and high cement stone strength, ensuring robust performance in ultra-high temperature cementing operations.
Key Features
Suitability for Deep and Ultra-Deep Well Cementing: Specifically designed for challenging environments.
Temperature Resistance up to 240°C:Reliable performance under extreme conditions.
Cement Stone Stability at High Temperatures: Maintains structural integrity without strength degradation.
High Safety Standards for Ultra-High Temperature Cementing Operations: Ensures operational security.
Applications
Cementing for Deep and Ultra-Deep Wells: Suitable for the most challenging subsurface conditions.
High-Temperature Exploration Well Cementing: Optimized for wells in intense exploration settings.
System Additives
Fluid Loss Additive (FLO-S): Recommended dosage: 2–3% for solid types; 6–8% for liquid types.
High Temperature Retarder (RET-H): Adjust dosage as needed.
Dispersant (CF40L): Recommended dosage: 1–2.5% for solid types; 2–4% for liquid types.
Thermal Stabilizer (SA11S): Recommended dosage: 35–55%.
Defoamer (DESL): Recommended dosage: 0.5–1% for liquid types.
Enhancer (MX): Recommended dosage: 2–5% for liquid types.
Weighting Agent (CD-X): Hematite-based, adjustable density from 2.0 to 2.60 g/cm³
Key Additive Descriptions
Thermal Stabilizer SA11S
Under high-temperature conditions, the hydration products of silicate cement can undergo phase transformations, leading to structural damage and strength reduction in the cement stone. By incorporating SA11S, which is generally added at a rate of 35% and increases with temperature, this additive effectively inhibits strength degradation, ensuring the integrity of the cement sheath across various water types including fresh, seawater, and saline water.
Functions:
Inhibits cement stone strength degradation.
Enhances microstructure and mechanical properties.
Performs effectively with various water-mixing environments.
MX Enhancer
MX enhancer is a high-activity silica suspension processed through special techniques. The amorphous silica particles in MX are small and densely packed, restricting free water movement between cement particles, enhancing slurry stability, and reducing permeability. This promotes C-S-H gel formation, strengthening the cement stone's early and bonding strength, gas migration resistance, and corrosion fatigue performance, suitable in complex cementing assignments.
Functions:
Enhances early cement slurry strength.
Improves microstructure and mechanical properties.
Boosts gas migration resistance and corrosion resistance.
Operates well in diverse water environments.
High Temperature Retarder RET-H
RET-H is composed of a terpolymer of AA/MA/AMPS, non-toxic, odorless, and non-corrosive. RET-H offers adjustable thickening times, showing a linear relationship with dosage for precise control, without affecting cement stone strength. Wide applicability in highly mineralized settings, and compatible with varied cement types and water qualities.
Functions:
Adjusts slurry thickening time with a linear dosage relationship.
Suitable for temperatures from 170 to 240°C.
Performs well across multiple water environments.
Anti-Gas Migration Agent GR61L
GR61L is an emulsion polymer microsphere product conducive to temperatures up to 250°C. These polymer latex particles possess sizes of 5-15μm and, when incorporated into cement slurry, exhibit low fluid loss, high anti-gas migration, and high toughness, ideal for challenging wellbore situations.
Functions:
Features low fluid loss, good rheology, anti-gas migration, and high toughness.
Enhances microstructure and mechanical properties.
Compatible with density regulators for tailored slurry density preparation.
Suitable for diverse water environments in the slurry.