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Thermo-chemical cleaning agent for polymer-containing oil sludge in oil field as well as preparation method and application thereof

A cleaning agent and oil-sludge technology, applied in chemical instruments and methods, detergent compositions, polymer surface active compounds, etc., can solve the problems of increasing the complexity of steps, complex reagents, and difficult handling

Inactive Publication Date: 2020-10-30
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent document CN108911447A discloses a compound treatment agent containing poly-oil sludge and its application method, but the reagents involved are too complicated, and may cause secondary pollution, and also increase the complexity of the steps, and the overall cost will increase accordingly
[0005] Moreover, due to the long-term accumulation and storage of polymer-containing sludge, crude oil, polymers and sediment are cross-linked with each other, and the sludge is solid, black, high in hardness, and high in viscosity, which is more difficult to handle than other ordinary sludge.
With reference to the disclosed cleaning agent containing poly oily sludge in Chinese patent CN110078327A, this kind of oily sludge cannot be well treated

Method used

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  • Thermo-chemical cleaning agent for polymer-containing oil sludge in oil field as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve sodium silicate: SP169: rhamnolipid in water at a mass ratio of 10:1:0.5, mix well to obtain a cleaning solution for later use; take 20g of poly-containing sludge (moisture content: 23%, oil content: 20% , solid content rate: 57%), added to a beaker containing 150mL of detergent solution, the mass content of detergent is 1.1%; heated in a water bath at 70°C, mechanically stirred at a stirring speed of 400rpm for 1h, stood for 30min, waited for oil, The water and sediment are layered, and the oil film is thicker on the surface, and the water phase is yellow and turbid; the upper layer of oil is scraped off, and the sediment is discharged after reaching the standard. For oil recovery, the recovery rate of crude oil can reach 93.75% by weighing, and the oil content of sludge can be reduced to 0.94%.

[0031] Such as figure 1As shown, comparing the oil sludge before and after treatment macroscopically, it can be seen that the oil sludge before treatment is black, ...

Embodiment 2

[0033] Dissolve sodium silicate: SP169: rhamnolipid in water at a mass ratio of 15:1:0.5, mix well to obtain a cleaning agent solution for later use; take 20g of poly-containing sludge (moisture content: 23%, oil content: 20% , solid content rate: 57%), added to a beaker containing 150mL of detergent solution, the mass content of detergent is 1.1%; heated in a water bath at 70°C, mechanically stirred at a stirring speed of 400rpm for 1h, stood for 30min, waited for oil, The water and sediment are layered, and the oil film is thicker on the surface, and the water phase is yellow and turbid; the upper layer of oil is scraped off, and the sediment is discharged after reaching the standard. For oil recovery, the recovery rate of crude oil can reach 92.58% by weighing, and the oil content of sludge can be reduced to 1.10%.

Embodiment 3

[0035] Dissolve sodium silicate: SP169: rhamnolipid in water at a mass ratio of 10:1:0.5, mix well to obtain a cleaning solution for later use; take 20g of poly-containing sludge (moisture content: 23%, oil content: 20% , solid content rate: 57%), added to a beaker containing 150mL of detergent solution, the mass content of detergent is 1.1%; heated in a water bath at 70°C, mechanically stirred at a stirring speed of 400rpm for 1h, stood for 30min, waited for oil, The water and sediment are layered, and the oil film is thicker on the surface, and the water phase is yellow and turbid; the upper layer of oil is scraped off, and the sediment is discharged after reaching the standard. For oil recovery, the recovery rate of crude oil can reach 93.75% by weighing, and the oil content of sludge can be reduced to 0.94%.

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Abstract

The invention discloses a thermo-chemical cleaning agent for polymer-containing oil sludge in an oil field as well as a preparation method and application thereof; the cleaning agent comprises a plurality of ionic cleaning agents and an alkaline builder, and a non-ionic cleaning agent is rhamnolipid, sophorolipid, AEO-9, EL100, SP169 or Tween 80; the alkaline builder is one or more of sodium silicate, sodium carbonate and sodium hydroxide. The preparation method of the cleaning agent comprises the steps: firstly, dissolving one or more alkaline builders in water to prepare a solution; and adding several non-ionic cleaning agents, and uniformly stirring to obtain the thermo-chemical cleaning agent for the polymer-containing oil sludge in the oil field. The interfacial tension of the oil sludge is greatly reduced, the surface wettability of a solid phase is changed, and residual oil can be helped to be removed from the solid phase; the alkaline builder plays a better dispersing role; thecomponents interact with one another, so that the use amount of the cleaning agent is reduced, and the recovery rate of crude oil is increased. The method for treating the polymer-containing oil sludge is simple to operate, low in cost and high in crude oil recovery rate, the oil content in the oil sludge can be reduced to 1%, and the national emission standard is achieved.

Description

technical field [0001] The invention relates to the technical field of oilfield oil sludge treatment, in particular to a thermochemical cleaning agent for oil sludge and its preparation method and application. Background technique [0002] In the process of oilfield exploitation, polymer flooding is an effective exploitation method in our country. When polymer enhances oil recovery, it will produce a large amount of polymer-containing oil sludge, which has the characteristics of high viscosity, fine particles and difficult dehydration. Because the existence of oil sludge will seriously affect the production, the content of suspended solids in the reinjection water will seriously exceed the standard, causing the formation to be blocked and the water absorption capacity of the oil phase to decrease significantly. If it is stacked in the open air, one will cause waste of crude oil contained in the oil sludge, and the other will cause pollution of soil, air and water resources....

Claims

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Application Information

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IPC IPC(8): C11D1/825C11D3/08C02F11/00C02F103/10
CPCC02F11/00C02F2103/10C11D1/008C11D1/66C11D1/662C11D1/825C11D3/08
Inventor 包木太逯志扬刘伟赵兰美孙晓军
Owner OCEAN UNIV OF CHINA
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