| The exploitation of oil field on-land has entered the anaphase in our country. Asthe widely use of polymers in recent years, the corrosion and scale problems in thesystem of injection sewage have become more and more serious. In order to reducethe losses caused by the scaling and corrosion, chemical dosing with suitableanti-corrosion and scale inhibitor seems to be easy and effective. However, the liquiddosing system also causes a lot of problems, such as the limited protect area,complex dosing process and management trouble. Therefore, the chemical dosing bymeans of a system which can be controlled remotely is the ideal scenario. This papermainly developed a kind of solid inhibitor which can solve all the problemsmentioned above.Static weight loss method was used to investigate the anti-corrosion performanceof imidazoline and static anti-scale method was used to investigate the scaleinhibition performance of PESA. Both the PESA and imidazoline were bought inlocal and the test results showed that the products we bought were qualified. ThenDesign Expert was used to optimize the ratio of PESA to imidazoline, with theresponse factors R1: scaling inhibition rate and R2: corrosion inhibition rate.The PVA hydrogel was chosen as the carrier of corrosion and scale inhibitors. Therecipe (in wt%) of the solid inhibitor was designed. The price of the solid inhibitorwas around9,863rmb/t, indicating its good economic benefit.Boric acid-iodine spectrophotometric method, ultraviolet spectrophotometry andstatic anti-CaCO3scale method were used to evaluate the releasing performance ofthe solid inhibitor.The static releasing test showed that the PVA-based imidazoline had a long releaseperiod (about100d). And the pattern of initial releasing stage fitted to zero orderrelease plot. The dynamic releasing test with the simulated dynamic device showedthe PVC based anti-corrosion and scale hydrogel had a good performance on releasing control, and it can be used in oil sewage system for long-term use. |
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