Are copolymer scale inhibitors effective against calcium sulfate scale?

The performance of the two synthesized copolymer scale inhibitors against calcium sulfate scale was tested in accordance with the Performance Evaluation Method of Scale inhibitors for Oil Fields (SY/T 5673–93) in the petroleum and Natural gas industry standard of China.

Are scale inhibitors suitable for oil field applications?

This research presents a methodology for developing scale inhibitors suitable for oil field applications and furnishes theoretical underpinnings for the fabrication of efficient and eco-friendly scale inhibitors. Article subjects are automatically applied from the ACS Subject Taxonomy and describe the scientific concepts and themes of the article.

Does scale inhibitor affect calcium ion?

In addition the solubility of calcium sulfate is higher than carbonate, so only a low dose of scale inhibitor is needed. Therefore, when the amount of scale inhibitor is the same, the effect of scale inhibitor on calcium ion is reflected in the number of functional groups contained in the molecular chain.

Why are carboxylic acid scale inhibitors weak?

Although carboxylic acid scale inhibitors have excellent scale inhibition performance, carboxylic functional groups make the scale inhibitor weak acidic, which will form insoluble calcium gel with calcium ions in the water environment with high hardness, this is due to weak acidity of the inhibitor caused by -COOH.

Which scale inhibitor has the best scale inhibition efficiency?

In the optimum water environment, the scale inhibition efficiency of CaCO 3 scale and CaSO 4 scale reached 100%, BaSO 4 scale could reach 75% and SrSO 4 scale could reach 54%. P (ESA-AA-PTA) had better scale inhibition properties than the majority of commercially available oilfield scale inhibitors.

What are phosphate-containing scale inhibitors?

Phosphorus-containing scale inhibitors are mainly divided into inorganic phosphates and organic phosphonates. phosphate ions can chelate with calcium ions and adsorb on the active sites on the crystal surface, thus inhibiting crystal growth and slowing down the formation of calcium scale [ 9 ].