PBTC (Phosphonobutane-1,2,4-Tricarboxylic Acid) is commonly used in the oil field for its scale and corrosion inhibiting properties. It finds various applications in oil production, drilling operations, and well treatment. Here are some common uses of PBTC in the oil field:
- Scale Inhibition: PBTC is added to water systems, such as injection water or production fluids, to prevent the formation of mineral scales. It effectively inhibits the precipitation and deposition of scales such as calcium carbonate, calcium sulfate, and barium sulfate, which can restrict fluid flow and reduce production efficiency. By controlling scale formation, PBTC helps maintain the productivity and longevity of oil wells, pipelines, and surface facilities.
- Corrosion Inhibition: PBTC acts as a corrosion inhibitor in oilfield systems. It forms a protective barrier on metal surfaces, reducing the rate of metal corrosion caused by corrosive agents in the fluid, such as oxygen, hydrogen sulfide, or carbon dioxide. By inhibiting corrosion, PBTC helps mitigate equipment damage, prolong the lifespan of infrastructure, and enhance safety in oilfield operations.
- Well Stimulation: PBTC can be used in well stimulation treatments, such as acidizing or hydraulic fracturing. It assists in preventing the precipitation of mineral scales during these processes by sequestering and dispersing metal ions present in the formation water or injected fluids. This helps maintain the permeability of the reservoir and improves hydrocarbon recovery.
- Pipeline Cleaning: PBTC is employed in pipeline cleaning operations to dissolve and remove scale deposits and iron oxide (rust) from the internal surfaces of pipelines. It acts as a chelating agent, binding with metal ions and facilitating their removal during the cleaning process. This aids in maintaining pipeline integrity, improving flow rates, and reducing the risk of blockages.
It’s important to note that the specific usage and concentration of PBTC in the oil field may vary depending on factors like the specific reservoir conditions, water chemistry, and operational requirements. Oilfield service companies and operators follow industry best practices, conduct compatibility tests, and ensure compliance with relevant regulations when incorporating PBTC into oilfield operations.