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Method for recovering sandy oil-containing sludge

A recycling method, oil sludge technology, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as equipment corrosion, secondary environmental pollution, etc., and achieve the effect of solving discharge problems

Inactive Publication Date: 2010-06-16
新疆油田勘察设计研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN1526797A, application of extraction method to recover fuel oil from oily sludge, the patent uses a general-purpose extraction tower, when the oily sludge layering is slow, it needs to add 1% to 3% dilute acid to break the emulsion, which will cause equipment Corrosion and secondary pollution of the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, the sandy oily sludge recovery method is carried out according to the following steps: the extraction solvent and the sandy oily sludge in the oilfield are mixed in a volume ratio of 0.5:1 to 10:1 at a temperature of 10°C to 80°C. Mixing, the oil is dissolved in the extraction solvent to form a three-layer separation state, and then the extraction solvent layer, water layer and silt layer are separated from each other, and then the separated extraction solvent layer is obtained by distillation under normal pressure or reduced pressure to obtain oil and extraction. Solvent; Wherein, extraction solvent adopts 6 # Solvent oil, 120 # One or a mixture of solvent oil, aromatic hydrocarbons, condensate oil, and petroleum ether.

Embodiment 2

[0022] Example 2, the sandy oily sludge recovery method is carried out according to the following steps: the extraction solvent and the sandy oily sludge in the oil field are fully mixed at a volume ratio of 0.5:1 at a temperature of 10 ° C, and the oil is dissolved in the extraction solvent The three-layer separation state is formed in the middle, and then the extraction solvent layer, the water layer and the silt layer are separated from each other, and then the separated extraction solvent layer is obtained by distillation under normal pressure or reduced pressure to obtain oil and extraction solvent respectively; wherein, the extraction solvent adopts 6 # mineral spirits or 120 # Solvent oil.

Embodiment 3

[0023] Example 3, the sandy oily sludge recovery method is carried out according to the following steps: the extraction solvent and the sandy oily sludge in the oil field are fully mixed at a volume ratio of 1:1 at a temperature of 50 ° C, and the oil is dissolved in the extraction solvent The three-layer separation state is formed in the middle, and then the extraction solvent layer, the water layer and the silt layer are separated from each other, and then the separated extraction solvent layer is obtained by distillation under normal pressure or reduced pressure to obtain oil and extraction solvent respectively; wherein, the extraction solvent adopts 6 # mineral spirits or 120 # Solvent oil.

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Abstract

The invention belongs to the technical field of sludge treatment of oil fields and relates to a method for recovering sandy oil-containing sludge, which comprises the following steps: fully mixing extracting solvent with the sandy oil-containing sludge of the oil fields in a volume ratio of 0.5:1 at a temperature of between 10 and 80 DEG C to allow oil to dissolve in the extracting solvent to form a structure of three separated layers; then separating an extracting solvent layer, a water layer and a silt layer from one another; and performing distillation of the separated extracting solvent layer at an atmospheric pressure or reduced pressure to acquire oil and the extracting solvent respectively. The method can effectively extract and recover crude oil in the oil-containing sludge, and silt separated out reaches national stacking standards; the solvent can be recycled, and washing water can be sewage of the oil fields and can be recycled by electroflotation without causing secondary pollution, so that the oil and the water in the sandy oil-containing sludge of the oil fields can be recovered, and thus the original discarded resources are fully utilized, and the problem of discharging the sandy oil-containing sludge of the oil fields is solved effectively.

Description

technical field [0001] The invention relates to the technical field of oilfield sludge treatment, and relates to a method for recovering sandy oily sludge. Background technique [0002] The sources of sludge are mainly sandy oily sludge produced during crude oil extraction, sandy oily sludge produced during oil field gathering and transportation, and sandy oily sludge produced by refinery sewage treatment systems. In addition to crude oil, these sludges also contain formation sediment carried in the production fluid, flocs formed during the sewage treatment process of oilfield sewage treatment stations, pipeline corrosion products, heavy metal salts, paraffin wax, colloidal asphaltenes, etc., and A certain amount of moisture. [0003] The oily sludge produced in the process of crude oil extraction mainly comes from the surface treatment system. The oily sludge produced in the process of oil extraction sewage treatment, plus the flocs formed by the water purifying agent adde...

Claims

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Application Information

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IPC IPC(8): C02F11/00
Inventor 张学鲁杜文军杜庆华刘国良骆伟王爱军赵瑞玉曾玉群杨宴宾
Owner 新疆油田勘察设计研究院
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