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Ternary compound oil drive water exit processing method

A technology of ternary compounding and processing method, applied in the field of environmental engineering, can solve problems such as public reporting of processing technology, and achieve the effect of resource utilization

Inactive Publication Date: 2009-01-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this kind of produced water, at present, there is no relevant mature and practical treatment technology public report

Method used

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  • Ternary compound oil drive water exit processing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take the effluent from the AP flooding production water settling tank of the Xingerzhong Experimental Station of the Fourth Oil Production Plant of Daqing Oilfield. The oil content is 106 mg / L, the suspended solid (SS) content is 156 mg / L, and the median diameter of oil droplets is 38 μm. Its pH is 9.6. Adjust its pH to 9 with dilute sulfuric acid, introduce the water in the pH adjustment tank into stirring tank 1, add 3.18mmol / L (moles / produced water volume) of magnesium sulfate (i.e. 3.18mmol / L magnesium ion), and stir Stir in tank 1 for 5 min. At this time, the pH of the produced water is 8.6, and the pH does not need to be further adjusted; The water in the mixing tank 3 is introduced into the stirring tank 3, and the aluminum sulfate (that is, 2.12mmol / L aluminum ion) of 1.06mmol / L (number of moles / produced water volume) is added, and the stirring reaction is carried out for 5min; after that, the water in the stirring tank 3 is introduced into the settling tank, st...

Embodiment 2

[0025] The produced water from the AP flooding production water settling tank of the Xingerzhong Experimental Station of the No. 4 Oil Production Plant of Daqing Oilfield was taken. The oil content was 380 mg / L, the suspended solid (SS) content was 556 mg / L, and the median diameter of oil droplets was 98 μm , its pH is 9.6, its pH is adjusted to 7 with dilute sulfuric acid, the water in the pH adjustment tank is introduced into stirring tank 1, the magnesium sulfate (being 38mmol / L magnesium ion of 38mmol / L (number of moles / production water volume)) ), stirring 10min, at this moment, the pH of produced water is 6.3; Add liquid caustic soda to adjust pH to 7; Stir for 10min; introduce the water in the stirring tank 2 into the stirring tank 3, add 15.2mmol / L (number of moles / volume of produced water) aluminum sulfate (that is, 30.4mmol / L aluminum ion), and stir for 10min; the water in the stirring tank 3 Introduce it into a settling tank and let it stand for 45 minutes. The oil ...

Embodiment 3

[0027]Take the produced water before the settling tank and the effluent water after the settling tank from the ASP flooding production water produced by the No. 4 Oil Production Plant of Daqing Oilfield Xingerzhong Test Station, and mix the two according to a certain ratio. The oil content is 218mg / L, and the suspended solids (SS) content It is 216mg / L, the median diameter of oil droplets is 42μm, and its pH is 9.6. Adjust its pH to 8 in the pH adjustment tank with dilute sulfuric acid; introduce the water in the pH adjustment tank into the stirring tank 1, add 10.9mmol / L (moles / produced water volume) of magnesium sulfate (i.e. 10.9mmol / L magnesium ions), stirring for 8min, at this time, the pH of the produced water is 7.3, and it is not necessary to adjust the pH; the outlet water in the stirring tank 1 is introduced into the stirring tank 2, and the humic acid of 650mg / L (quality / produced water volume) is added, and stirred for 8min; stirring The water from tank 2 is introdu...

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Abstract

The invention relates to a processing method of ternary combination flooding produced water in an oil field, which comprises: adjusting the pH value of the produced water to between 7 and 9, and adding magnesium salt, humic acid and aluminum salt step by step according to the oil content of the produced water, and the treatment time of each step is 5 to 10min.; and the pH value of water needs to be maintained between 7 and 9 in the processing step of adding magnesium salt and aluminum salt. The produced water is treated jointly by three steps of magnesium salt, humic acid and aluminum salt and then undergoes the settlement treatment, both the oil content and the suspended solid content of the produced water can be lower than 5mg / L, and the mid value of particle diameters of oil droplets can be lower than 2mu m, so as to reach the oil well re-injection water standard. The method is simple and low in running cost, and provides a feasible produced water processing means for oil fields adopting the ternary combination flooding oil extraction process.

Description

technical field [0001] The invention relates to a method for treating produced water of three-element compound flooding in an oil field, which is used for treating oily waste water produced in the oil recovery process of three-element compound flooding in an oil field. It belongs to the field of environmental engineering technology. Background technique [0002] With the prolongation of the exploitation time of some major oilfields in my country and the decline of crude oil reserves, the tertiary oil recovery technology for the purpose of enhancing crude oil recovery has been valued by relevant departments since the 1990s. to a rather large scale. The ASP flooding oil recovery technology is one of the tertiary oil recovery technologies, which is characterized in that chemical agents such as polymers, surfactants, and alkalis are injected into the oil well to increase the oil recovery rate of the oil well. At present, this technology was first applied in Daqing Oilfield beca...

Claims

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Application Information

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IPC IPC(8): C02F1/40C02F1/52
Inventor 朱南文车承丹寿宗奇查尔丁瑾肖佳沐
Owner SHANGHAI JIAO TONG UNIV