Ammonium persulfate is a commonly used oxidizing reagent in petroleum exploitation and oil & gas well operations. In recent years, its coarse-grained form has drawn growing attention from construction parties. It is not a simple upgraded or downsized version of conventional products, but a tailored option for specific working conditions. Therefore, the core question in selection is not "which is better", but "which better fits the on-site operating conditions". This question can be evaluated from three dimensions: dissolution & release rate, storage & transportation safety, and purity & impurity control.
Ⅰ. Dissolution and Release Rate
The primary consideration in selecting coarse-grained ammonium persulfate lies in its downhole release behavior, which is the most intuitive difference from conventional products.
Coarse-grained ammonium persulfate has larger particles and smaller specific surface area per unit mass, which reduces contact with water and results in a slower dissolution rate than conventional granules. This does not mean poor solubility: over time, it gradually dissolves in the wellbore and continuously releases active ingredients into the system. The "slowness" refers to the initial dissolution rate rather than the final dissolution degree.
This feature delivers unique value in high-temperature wells. Higher well temperature accelerates the dissolution and reaction of conventional granules, causing most reagents to be consumed in the upper section of the wellbore. By delaying partial dissolution, coarse-grained products allow more active reagents to migrate with fluids into deep subsurface fractures before release, thus improving downhole reagent utilization. To judge whether the release rate is appropriate, purchasers shall consider well temperature, well depth and the length of the action window: longer windows and higher well temperatures leave more room for sustained release; for short action windows, reassessment is required. Since dissolution rate is directly related to particle morphology, stable particle size distribution is particularly critical.
Fujian Zhanhua Chemical provides customized ammonium persulfate particles upon request: particle size range and coarse particle proportion can be negotiated according to the operator's process conditions to better match well conditions. For users, customized particle specifications avoid repeated on-site debugging of liquid preparation and feeding, and reduce parameter adjustments caused by morphological fluctuations.
Ⅱ. Storage & Transportation Stability and Operational Safety
After confirming the release rate, it is necessary to ensure stable and safe delivery of coarse-grained ammonium persulfate from ex-factory to feeding.
Ammonium persulfate is classified as a Class 5.1 oxidizing substance (UN 1444, Packing Group III). It shall be stored in dry, cool and ventilated environments, isolated from combustibles, reducing agents and acids. Particle morphology also affects hygroscopicity, caking tendency and dust generation: products with stable morphology are less prone to moisture-induced caking during long-distance transportation and open-air stacking, and reduce dust during feeding, enabling smoother on-site operations.
For projects with concentrated consumption, continuous and sufficient delivery is as important as safety. Supply capability is a core advantage of Zhanhua Chemical: with an annual ammonium persulfate capacity of 75,000 tons, continuous production ensures consistent indicators across batches. The company owns self-operated hazardous chemical warehouses and cooperates with professional logistics providers, enabling phased delivery as scheduled even during peak consumption periods and reducing on-site material waiting.
Ⅲ. Purity and Impurity Control
Regardless of working conditions, product specifications always serve as the fundamental guarantee for the release performance of coarse-grained ammonium persulfate.
Main content, moisture, and impurities such as iron and manganese directly affect dosing calculation and storage stability. Better batch consistency eliminates repeated adjustments to on-site liquid preparation and dosage. During selection, purchasers shall verify whether main content and impurity indicators meet requirements, whether particle size and coarse particle proportion remain stable, and request samples and COA (Certificate of Analysis) for validation.
In terms of specific indicators, the ex-factory standards for conventional ammonium persulfate from Zhanhua Chemical are as follows: main content ≥98.5%, iron ≤0.0005%, manganese ≤0.0001%, heavy metals (calculated as lead) ≤0.0010%, moisture ≤0.15%, with COA attached to each shipment. Purchasers can trace corresponding test data via batch numbers for recheck. The above indicators are enterprise ex-factory standards. Purchasers are advised to confirm with suppliers whether they meet the requirements of specific operating scenarios. For verification against general product standards, reference can be made to GB/T 26519.3-2021 Industrial Persulfates – Part 3: Ammonium Persulfate for Industrial Use.
Returning to the selection itself, the value of coarse-grained ammonium persulfate lies in stability: it achieves fuller migration and release at the cost of slightly slower dissolution rate, and guarantees storage, transportation and feeding with stable morphology and indicators. By comparing the three dimensions of dissolution rate, storage & transportation safety and purity control, and matching with specific well conditions, purchasers can make well-founded decisions on coarse-grained ammonium persulfate selection. With years of dedication to the persulfate sector, Fujian Zhanhua Chemical exports ammonium persulfate to Southeast Asia, South America, the Middle East, Africa and other regions. Supported by stable supply rhythm and quality control capability, it continuously provides reliable ammonium persulfate products for customers in oil & gas and various industrial fields.