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Oil field commonly used anti-fouling agent

Post Time:2016-10-22 23:56:36 

The role of scale inhibitors: delay, reduce or inhibit scaling.

Most of the commonly used anti-fouling agent is to prevent the growth of scale crystals, that scale inhibitor must be in the water of small crystals just formed from the water when the work.
Inorganic phosphate
Trisodium phosphate (Na3PO4), tetrasodium pyrophosphate (Na4P2O7), sodium hexametaphosphate ((NaPO3) 6), sodium tripolyphosphate (Na5P3O10).
Features: Pharmacy price is low, anti-CaCO3 scale more effective. Easy hydrolysis of orthophosphate, and calcium ion reaction does not dissolve calcium phosphate; with water temperature, hydrolysis speed. The maximum operating temperature is 80 ℃.
Organic phosphoric acid and its salts
Aminotrimethylenephosphonic acid (ATMP), ethylenediaminetetramethylene phosphonic acid (EDTMP), sodium hydroxyethylidene diphosphate (HEDP).
Features: not easy to hydrolysis, low dosage, good anti-scaling effect, compatibility with other sewage treatment agent is better, the use of temperature up to 100 ℃ or more
Polyacrylic acid (PAA), polyacrylamide (PMA), polymaleic anhydride (HPMA), and the like. HPMA to prevent CaSO4, BaSO4 scale effect.
Complex compound

Several different effects of a single agent according to a certain percentage of mixing, as long as no reaction between each other, no offset, and play their own characteristics, can be compounded into compound use.

Selection and Evaluation of Scale Inhibitor
Evaluation of scale inhibitors
Using the laboratory test to determine the relative effect, with the scale inhibition rate P said.
Selection of Scale Inhibitor
The choice of scale inhibitor to consider the following factors:
Scale chemical composition: the main components of scale-like to find out the scale of the main ions, targeted selection of scale inhibitors, to achieve good scale inhibition effect.
Scaling severity: The effect of the scale inhibitor is affected by the degree of saturation. A small amount of scale, the scale inhibitor has a good effect, scaling speed is high, according to the structure of the severity of the scale inhibitor and dosage.
Compatibility with other sewage treatment agents: Whether the scale inhibitor reacts with other chemicals in the system (eg, fungicide, corrosion inhibitor, oxygen scavenger, etc.) to counteract the respective effects.
Temperature: With the temperature rise, the scale inhibitor effect is reduced. Each scale inhibitor has an upper temperature limit.
If an effective scale inhibitor has been selected, two criteria must be ensured:
(A) When the scale has just been formed in the water, the added scale inhibitor must be most effective in preventing further growth of the scale - the scale inhibitor must be added upstream of the problematic site.
(B) The scale inhibitor must be added continuously to the water, so as to prevent the growth of scale crystals precipitated from the water.
Note: Whether it is continuous injection of anti-fouling agent, or "intermittent treatment" method, should ensure that the system continuously adding anti-scaling agent

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