Acidizing

Stimulation The process of oil and gas stimulation enhances the yield and flow of hydrocarbons in old wells. This method involves the injection of various mineral acids, such as hydrochloric acid, hydrofluoric acid, sulfuric acid, or organic acids such as acetic acid and citric acid, to create new holes and channels within the oil well reservoir. These new pathways open the route for oil to reach the well chamber, thereby increasing production returns to the target value. This process is implemented in both types of water injection wells and production wells to boost production efficiency. From the point of view of the type of oil and gas reservoirs, by examining the available minerals, about 50% of the reservoir rocks are carbonate minerals (such as limestone, dolomite, etc.) and the remaining 50% are sandstones (such as quartz, feldspar, etc.). The two main methods used in the acidification process are:

1. Matrix acidizing

In this method, which is most employed in sandstone reservoirs to create channels and gaps in the structure of oil and gas reservoir formations, specific acids are injected into the well due to their corrosive properties and effective interaction with the formation. In this approach, the pump pressure remains lower than the pressure required creating cracks in the reservoir rock, and the primary voids are formed by the corrosive action of the acid.

2. hydraulic fracture acid

In this method, the pump pressure is adjusted based on the strength of the formation rock in the reservoir. The goal is to inject acid into the well at a pressure higher than the strength of the reservoir rock. As a result, the cracks and holes caused by pressure and acids will enhance the fluid flow rate in the well. Due to the global need for increased oil and gas extraction, the acid process is widely used in various oil field regions, including:

• The wells of the Zagros basin, including Khuzestan
• Wells in the Persian Gulf
• Gas wells
• Russia
• Kazakhstan
• Azerbaijan
• CIS
• Iraq (Erbil and Basra)
• Arab countries

When selecting the appropriate product, our experts Chemical Tasfyeh Co. consider several critical factors, including:

• The type of carbonate or silicate formation
• The specific acid used
• Acidification temperature (ranging from 200°F to 300°F)
• The well’s lifespan
• Acid concentration

At Chemical Tasfyeh Co, we have synthesized and formulated effective and safe materials to enhance performance and profits while ensuring a protected situation for our partner operators in the oil fields. In many stimulation programs (including hydraulic fracturing, and matrix acidizing), new holes and channels are created within the formation. As a result, oil flow increases through these channels. When oil and other hydrocarbons interact with acids, some undesirable byproducts and issues may occur. Common challenges include:

1. Corrosion, especially in high-temperature wells.
2. Accumulation of sludge, such as asphalt and wax.
3. Presence of iron ions.
4. Occurrence of H₂S gas.
5. Formation of oil-acid-water emulsions.

To address these issues, Chemical Tasfyeh Co. has developed a class of products carefully selected by experts to perform effectively under specific conditions for each type of reservoir rock and at temperatures ranging from 200°F to 300°F. These products include:

1. High-temperature oil well anti-corrosion agents (for temperatures between 200°F and 300°F).
2. Anti-sludge agents.
3. NON-emulsifiers.
4. H₂S scavengers.
5. Iron control/reducers.
6. Surfactants.