Oil field visous crude sewage silicone-removing and cleaning process

Abstract

The oil field viscous crude sewage silicone-removing cleaning technological process is characterized by that in the course ore moving silicone it has no need of regulating pH value of sewage, the active magnesium oxide can be directly added into the pretreated sewage, and after the sewage is passed through the vortex reactor and reacted, the inorganic aluminium salt anjd organic floccultant can be added in the discharge water, then fed into sludge reactor, said sludge reactor can provide high-concentration sludge, and said sludge can be fully reacted with feeding water, then fed into precipitation clearing device to implement sludge and water separation so as to obtain silicone dioxide and treated water in which the suspended matter content is lower.

Description

Technical field: [0001] The invention relates to a purification technology for advanced treatment of oilfield heavy oil sewage, which belongs to the category of oilfield chemistry. Background technique: [0002] Oilfield production fluid contains a large amount of sewage (10-90%), which becomes oilfield production water after separation from crude oil. Produced water from heavy oil fields (ie, heavy oil sewage) is generally reused in steam injection boilers after advanced treatment. After advanced treatment, the silica content is required to be below 50mg / L. At present, the process of silica treatment for heavy oil sewage is usually to first adjust the pH value of the pretreated sewage (oil content less than 10mg / L, suspended solids less than 30mg / L) to 10.2-10.5, and then add magnesium oxide or magnesium chloride, Silica in sewage is removed after sedimentation and clarification in clarification tanks or sedimentation tanks. Calcium oxide or sodium hydroxide is generally...

AI Technical Summary

Problems solved by technology

This silicon removal technology mainly has the following disadvantages: (1) The sewage after treatment is in an unstable state, and it is very easy to scale. Once the control is not good, the follow-up treatment device will not be able to operate; Put in a lot of PH regulator, silicon remover (dosing amount is 15 times that of removing silicon dioxide), coagulant (total amount is 1000-2000mg / L), and on the other hand, a large amount of sludge will be produced after precipitation (dosage amount The bigger the sludge, the bigger the sludge output, which is generally 80% of the dosage), which brings great difficulties to the operation and management; (3) the chemical treatment cost of this process is relatively high, generally 30% of the operating cost; (4) the The process has strict requirements on the pretreatment of heavy oil sewage

Based on the above reasons, the current silicon removal system for heavy oil sewage is difficult to operate, which seriously restricts the development of advanced treatment and reuse technology for heavy oil sewage, and affects the further improvement of oil field production and economic benefits.

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