Cementing Expander Agent is primarily composed of MgO and is produced using advanced rotary kiln calcination technology. This process compensates for the performance limitations of traditional calcium oxide and calcium sulfoaluminate-based expansion agents, significantly broadening the applicability of shrinkage-compensating concrete in oil well cementing. As a high-performance Cementing Expander Agent, it effectively controls concrete cracking by adapting to diverse downhole conditions, including variations in solid well slurry composition, formation temperatures, and age-dependent shrinkage. Based on the principle of shrinkage compensation and leveraging the tunable activity of lightly burned MgO, the expansion energy and timing are precisely engineered to counteract the structural shrinkage of cement under downhole conditions. This mechanism efficiently compensates for both thermal contraction and drying shrinkage, resulting in cement with superior crack resistance and low permeability.
This Cementing Expander Agent offers multiple advantages, including excellent chemical stability, low water requirement, and highly customizable expansion behavior. The key to its adjustable performance lies in the controlled activity of MgO, which is influenced by calcination temperature and duration. These parameters determine the microstructure and hydration activity of the product. Low-activity MgO expanders provide delayed expansion with subsequently rapid hydration rates, allowing the expansion process to be accurately controlled within 1000–1800 seconds. This makes it especially suitable for high-temperature and high-pressure cementing operations, ensuring reliable long-term zonal isolation.
Advantages:
• stable chemical products
• low water demand
• can designs adjustable properties.
Packaging:
25kg/bag
Performance of testing:
|
Item |
Specification |
|
Appearance |
Light yellow to brownish yellow |
|
MgO content,% |
≥90.00 |
|
Activity S(test under 30℃ |
1000-1800 |
|
Loss on ignition,% |
≤1.00 |
|
Rate of water content,% |
≤1.00 |
|
Fineness (0.315mm testing sieve left) |
≤5.00 |
|
Linear expansion rate,%(Expansion loop method,test under 80℃) |
≥1.00 |
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