Oilfield Waste Water Purification Processing Technology And Its Effective Use Of Impact Studies, And Stability

Sixth, ninth area heavy oil reservoir in Keiamayi oil-field is the first reservoir exploited by thermal in our country. It produces 35000m3/d serious waste water because of limited water treatment technique. In these waste water, it contains 500-2000mg/l oil,307-4790mg/l COD, 58℃ water temperature. From 1984-2000, It had accumulate recovered 2400× 104t crude oil, and drained away 9200× 104m3 waste water? It leads to water and heat wasted, environmentpolluted, vegetation died, oil-field flooded and so on. The national environment conservation bureau Lists it as the biggest contaminative resource In inland oil-fields.The title of this paper is: "study to heavy oil waste water treatment technique and influence after effective used"o Carried out " Sixth, ninth area's heavy oil waste water treatment project". Treat 35000m3/d waste water. Waste water after treated Arrived oil-field inject water criterion, national second class drain away water criterion, boiler water, used for heavy oil thermal recovery,, criterion and realized waste water effectively used. It Save 1200× 104m3/d fresh water, 2920 × 104Nm3 gas, and recovered 4800 t/a aging oil.Only these three aspects 4119 hundred million Yuan saved every ten years. It also do good to environment conservation, oil-field enterprise image promote and realizes Chinese petroleum promise "Create the concord of energy and environment."This paper first analysis's heavy oil waste water's composition,, and studiesevery kind of factor influences water quality., Finding out suspending grains'surface Zeta electric potential is the key factor deciding purified effect. Make treated waste water property steadily by adjusting ionic composition in waste water, Formed oil-field waste water effectively purified and steadily treatedtechnique. Set up heavy oil waste water treatment project and realized researchobjection.Main research result as follow:First: Theory calculation result display: suspending grains' surface Zeta electric potential is the key factor influences purified result. Ionic composition in waste water decided the steady of waste water property. Bring up a technique way that purified waste water effectively and steadily: in order to improve purify effect,, we decline suspending grain's Surface Zeta electric potential by adding some decontaminant medicine?For controlling corrode, inhibiting evildoer, destroying germs' living condition and improving stability of treated Waste water, we change ionic composition by adding ionic adjustment medicine.,Second : study decontaminant medicine's influence to waste water suspend grain's surface Zata electric potential and ionic composition. Developed new kind of decontaminant medicine. Treated waste water arrived corresponding criterion. And confirmed theory calculation results and research thinking are rightoThird : Developed flow reactor, make decontaminant react as completely as possible, and capture most suspending substances. Improved waste water treatment effect.Fourth: carried out spot-experiment and industrial experiment toward heavy oil waste water. Treated Waste water quality arrived Xinjiang oil-field's injection water quality criterion, national second class drain away water criterion, and oil boiler supply water quality criterion. Set up and implemented "sixth. Ninth area heavy oil waste water treatment project". In 2001 primarily realized heavy oil waste water effectively used: 12000m3/d injected back into oil-field, 13000 m3/d used back as , thermal recovery inject gas, boiler water, the rest drain away without pollution, and attained "zero drain away" target of heavy oil waste water.Fifth: The luster year's production practice show treated heavy oil waste water arrived oil-field injection, and thermal recovery boiler water criterion, and confirmed have no damage to reservior and thermal recovery boiler.Sixth: researched three harmless way to process oil contended sludge.Got rid of the negative influence, caused by the only left of waste water treatment, to environment.Seventh: Adopt this technique, we...