Method for recycling polymer-containing air flotation oil sludge

A sewage sludge and recycling technology, applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of occupying large cultivated land, soil, water body air pollution, etc., and solve the problem of environmental pollution Effect

Inactive Publication Date: 2014-03-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only occupies a large amount of cultivated land, but also pollutes the surrounding soil, water and air.

Method used

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  • Method for recycling polymer-containing air flotation oil sludge

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] A method for resource recovery and reuse of air-accumulating flotation sludge, the specific steps are as follows:

[0026] 1) Mix 500g of air-accumulated flotation sludge with 500ml of 20% hydrochloric acid solution and stir evenly after pressure filtration and dehydration to less than 80%, and let it stand;

[0027] 2) Set the mixture in step 1) for 24 hours to separate crude oil, aluminum-containing acid liquid and polymer. If the polymer and crude oil cannot be completely separated, use solvent extraction oil for extraction and separation. The solvent extraction oil is 6 # Solvent oil;

[0028] 3) The polymer separated in step 2) is used as an admixture for oil well cement after adjusting the pH value, drying, and pulverization, and the pH value is adjusted to 7 as an admixture for preparing oil well cement. The addition amount is 1%; wherein, The regulator used to adjust the pH value is a mixture of sodium hydroxide and sodium carbonate;

[0029] 4) Recycle and re...

Embodiment 2

[0031] A method for resource recovery and reuse of air-accumulating flotation sludge, the specific steps are as follows:

[0032] 1) Mix 500g of air-accumulating flotation sludge with 500ml of 30% hydrochloric acid solution after pressure filtration and dehydration, stir evenly, and let stand;

[0033] 2) Set the mixture in step 1) for 24 hours to separate crude oil, aluminum-containing acid liquid and polymer. If the polymer and crude oil cannot be completely separated, use solvent extraction oil for extraction and separation. The solvent extraction oil is mixed Aromatics;

[0034] 3) The polymer separated in step 2) is used as an admixture for oil well cement after adjusting the pH value, drying, and crushing; the added amount of the admixture for preparing oil well cement is 5% after adjusting the pH value to 9, wherein, The regulator used to adjust the pH value is a mixture of magnesium oxide and calcium oxide;

[0035] 4) Recycle and reuse the aluminum-containing acid s...

Embodiment 3

[0037] A method for resource recovery and reuse of air-accumulating flotation sludge, the specific steps are as follows:

[0038] 1) Mix 250 grams of air-accumulated flotation sludge with 800ml of 10% hydrochloric acid solution after pressure filtration and dehydration, stir evenly, and let stand;

[0039] 2) Set the mixture in step 1) for 24 hours to separate crude oil, aluminum-containing acid liquid and polymer. If the polymer and crude oil cannot be completely separated, use solvent extraction oil for extraction and separation. The solvent extraction oil is 6 # A mixture of solvent naphtha and mixed aromatics;

[0040] 3) The polymer separated in step 2) is used as an additive for fly ash pavement cement after adjusting the pH value, drying, and crushing; wherein, the regulator for adjusting the pH value is sodium hydroxide, magnesium oxide mixture;

[0041] 4) Recycle and reuse the aluminum-containing acid solution separated in step 2) in step 1), stop recycling until t...

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Abstract

The invention relates to treatment of oil sludge in oil fields and in particular relates to a method for recycling polymer-containing air flotation oil sludge. Through the method, a mutual effect between hydroxy-aluminium and a polymer is released due to an acid-soluble aluminum effect, and the thickness and stability of a water-in-oil emulsification colloidal particle interface membrane are reduced due to compression and curling effects on a double electric layer of the polymer of hydrogen ions, so that soluble aluminum, broken emulsion, the hydroxy-aluminium, the polymer and crude oil can be separated from one another; the separated crude oil is purified and then recycled; after the pH of the polymer is adjusted, the polymer is dried and crushed, and then can be taken as an additive of oil well cement; an acid solution with dissolved aluminum is taken as an aluminum source and applied to synthesis of aluminium polychlorid. Through the method, the environmental pollution caused by the polymer-containing air flotation oil sludge can be avoided, the crude oil can be recycled, the waste polymer and an aluminium-containing flocculating agent can be recycled, and the waste is changed into wealth.

Description

technical field [0001] The invention relates to the treatment of oily sludge in oilfields, in particular to a method for resource recovery and reuse of oily sludge containing air-accumulated floating sludge. Background technique [0002] The composition of oilfield oily sludge is very complex, mainly crude oil, machine impurities and water. However, in oil fields using polymer flooding and ASP flooding, the composition of oily sludge is more complex, which also contains a large amount of polymers and surfactants for oil flooding. [0003] With the development of my country's oilfields, the use of enhanced oil recovery methods such as polymer flooding and ASP flooding in the late stage of oilfield exploitation makes the produced fluid contain a relatively high concentration of polymers, which are produced during the treatment of polymer-containing sewage in the combined station. A large amount of polymer-containing oily sludge, especially the air-floated sludge produced by th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C10G1/00C01F7/56C04B22/12
Inventor 赵瑞玉朱成君王振波刘会娥李静朱晓菲罗贵林
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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