Study On Control The Relative Molecular Weight Of Green Water Treatment Agent Pesa And Relation Between Relative Molecular Weight And Its Properties

Polyepoxysuccinic acid is acknowledged green water treatment agent and new alternative in the world. It appears in recent years and its property of scale inhibition has been studied much more than other properties of PESA. It has been studied the relation between synthesis of polyepoxysuccinic acid and control of molecular weight ,the relation between molecular weight of PESA and its properties such as scale inhibition, corrosion inhibition and dispersion performance. The applications of PESA's scale inhibition property in several fields, so we use differert experiment methods to test the scale inhibition of PESA.In this study, effect of initiator, pH, temperature and time on products showed that different relative molecular weight were obtained by means of changing these factors.The standard method was used to study the connection between the scale inhibition and the relative molecular weight of PESA. It had been found that when the relative molecular weight changed, the properties changed also. When the relative molecular weight of PESA is in the range 800 to 1000, the scale inhibitions are best. When the relative molecular weight of PESA is lower than 700 or higher than 1000, the scale inhibition becomes worse. And inhibition of PESA for barium sulfate has been studied, the result show that when the relative molecular weight of PESA is in the range 700 to 850, the scale inhibitions are best, over 90%.Rotary coupon test has been used to study corrosion inhibition of PESA, it has been found that when PESA was used separately, it has some effect of preventing corrosion.The result show that when the relative molecular weight of PESA is in the range 750 to 1000, the corrosion inhibitions are best.Translucent rate and rotary viscosimeter method have been used to study the dispersion property of PESA. It has been found that PESA has excellent dispersion property to calcium carbonate and ferric oxide, and the best relative molecular weight range is 1000 to 1200.The green scale inhibitor polyepoxysuccinic acid's properties of scale inhibition to scale in the oil field were studied. The results indicate that PESA has excellent inhibitive effects to the poor solubility scales such as barium sulfate, calcium sulfate, strontium sulfate and to the calcium carbonate scale is normal. In order to solve the problem of different kind of scale in oilfield water system, we use a combination of PESA and PBTCA and AA/HPA as a water treatment agent add to the oilfield water system. The experiment results show that the complex scaling inhibitors can efficiently control the scale.