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Deep softening method of thick oil sewage

A heavy oil sewage and deep technology, applied in the field of oilfield sewage treatment, can solve the problems of filter fouling, high cost, and more chemicals in the silicon removal process, and achieve the effect of improving the uniformity coefficient and strengthening the hydrophilic and oleophobic properties

Active Publication Date: 2014-04-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the desiliconization process has problems such as excessive dosing, large amount of silica mud, high cost, and serious fouling of subsequent filters, and the reduction of silicon by all desiliconization processes cannot reach an order of magnitude reduction
Softening treatment mostly adopts strong acid resin and weak acid resin fixed bed softening process, and the removal of metal ions is not complete, and there are still metal ions with low concentration of ppm level in the water. Therefore, the traditional heavy oil sewage treatment process has residual silicon and Low concentrations of metal ions can still cause scaling problems in thermal recovery boilers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The present embodiment provides a kind of chelate adsorption resin, and it is prepared through the following steps:

[0046] Add 500mL of an aqueous solution (water phase) containing 2wt% gelatin and 15wt% sodium chloride into a 2L three-necked flask, stir, and control the stirring speed at 130rpm;

[0047] 100g acetoxystyrene, 16g divinylbenzene and 45g isobutanol are mixed to obtain an oil phase, then 1.0g benzoyl peroxide is added to the oil phase, and then added to the three-necked flask containing the water phase, the added At the same time, keep stirring. After the addition is completed, raise the temperature to 60°C and keep it warm for 8 hours, then raise the temperature to 85°C and keep it warm for 14 hours, then cool to room temperature to obtain polystyrene-based white balls, dry them after extraction or cleaning, and discharge;

[0048] Mix the dried polystyrene-based white ball with chloromethyl ether twice the mass of the polystyrene-based white ball at 10...

Embodiment 2

[0054] This embodiment provides a method for deep softening of heavy oil sewage, which includes the following specific steps:

[0055] Take 50L of heavy oil sewage after adjustment, coagulation sedimentation, dissolved air flotation, secondary filtration and primary macroporous weak acid treatment. The pH is 7.89, the temperature is 58°C, and the calcium, magnesium and iron ion concentrations are 211ppb and 73ppb respectively , 54ppb;

[0056] The chelating resin synthesized by 50mL embodiment 1 is placed in the adsorption column, and the heavy oily sewage after the treatment is passed through the adsorption column filled with the chelating resin synthesized by embodiment 1 under the flow velocity of 20BV / h, and the concentration of effluent is measured regularly , when the adsorption reaches the leakage point, stop the adsorption, and obtain deeply softened heavy oil sewage;

[0057] The hydrochloric acid that adopts concentration to be 1mol / L carries out desorption to above...

Embodiment 3

[0060] The present embodiment provides a kind of chelate adsorption resin, and it is prepared through the following steps:

[0061] Add 500mL of an aqueous solution (water phase) containing 3wt% gelatin and 20wt% sodium chloride into a 2L three-necked flask, stir, and control the stirring speed at 150rpm;

[0062] 100g acetoxystyrene, 20g divinylbenzene and 50g isobutanol are mixed to obtain an oil phase, then 1.0g benzoyl peroxide is added to the oil phase, and then added to the three-necked flask containing the water phase, the added At the same time, keep stirring. After the addition is completed, raise the temperature to 60°C and keep it warm for 10 hours, then raise the temperature to 90°C and keep it warm for 16 hours, then cool to room temperature to obtain polystyrene-based white balls, dry them after extraction or cleaning, and discharge;

[0063] Mix the dried polystyrene-based white ball with chloromethyl ether twice the mass of the polystyrene-based white ball at 1...

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Abstract

The invention relates to a deep softening method of thick oil sewage, which comprises the following steps: preterating thick oil sewage to remove impurities in the thick oil sewage, and carrying out preliminary softening treatment with a macroporous weak acid resin until the pH value of the thick oil sewage reaches 7-9 and the temperature reaches 57-80 DEG C; passing the pretreated thick oil sewage through an adsorption tower or adsorption column filled with a chelating resin at the flow rate of 20-30 BV / h to carry out adsorption treatment; and when the adsorption reaches the leakage point, obtaining the thick oil sewage subjected to deep softening. The method provided by the invention is a treatment process capable of efficiently softening thick oil sewage according to the water quality characteristic of the thick oil sewage; and the method provided by the invention can still be used repeatedly in a thermal recovery boiler without generating scales after saving the silicon removal system.

Description

technical field [0001] The invention relates to a deep softening method for heavy oil sewage, which belongs to the technical field of oilfield sewage treatment. Background technique [0002] Heavy oil development in oilfields mostly adopts steam huff and puff or steam flooding, which will inevitably produce a large amount of heavy oil wastewater, and with the change of heavy oil thermal recovery method and the increase of mining life, the amount of heavy oil wastewater produced will increase rapidly , its water quality components are complex and changeable, the water temperature is high, the viscosity is high, the oil-water density difference is small, the emulsification is serious, the biodegradability is poor, and the treatment is difficult. At the same time, the accumulation of salinity and silicon content in the heavy oil sewage during the repeated recycling process leads to fouling in the reuse boiler, which not only reduces the thermal efficiency of the boiler, but als...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/42
Inventor 蒋生健谢加才刘喜林范英才孙守国董滨曲金明郎成山
Owner PETROCHINA CO LTD
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