SSA-1™ agent (also called silica flour) is a powdered sand that helps oilwell cement maintain low permeability and high compressive strength under high-temperature conditions. SSA-1 agent is recommended for use in cementing wells where static temperatures exceed 230°F (110°C). Above this temperature, most cement compositions exhibit satisfactory compressive strength after the initial set, but will rapidly lose strength after continued exposure to high temperatures. SSA-1 agent helps prevent this problem by chemically reacting with the cement at high temperatures. SSA-1 agent has been widely used in thermal recovery wells in combination with refractory-type cements.
The greatest benefit of SSA-1 agent is its compatibility with various cementing materials and additives. SSA-1 agent is compatible with all cements as well as all commonly used retarders, friction reducers, low water-loss additives, and weighting and lost-circulation materials.
SSA-1 agent is mined and processed in the following two forms:
- In a minus 200-mesh powder for maximum reactivity in cement concentrations of normal weight
- In a selected particle-gradation design for densified cements where increased weights and maximum reactivity are required