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Novel oilfield sewage disposal coagulant

An oilfield sewage and coagulant technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of substandard water quality, short residence time, harsh hydraulic conditions, etc. fast effect

Active Publication Date: 2008-12-17
PETROCHINA CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The hydraulic conditions of the process are harsh: the residence time of the sewage in the reaction tank is short, only 30-45min, and the rising speed of the water flow in the annular space is about 5mm / s. In addition, there are sometimes serious emulsification phenomena and large-scale fluctuations in the flow rate of the crude oil sewage and other factors, the use of commonly used water purification agents such as polyaluminum chloride (PAC) is likely to cause incomplete demulsification and flocs, and the water quality after treatment is not up to standard

Method used

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  • Novel oilfield sewage disposal coagulant
  • Novel oilfield sewage disposal coagulant
  • Novel oilfield sewage disposal coagulant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The weight percent composition of the coagulant is 20% of aluminum sulfate, 4% of zinc sulfate, 0.5% of polydimethyl diallyl ammonium chloride, and the rest is water. This formula is suitable for the purification treatment of general oilfield sewage, and the effect is stable. Table 1 shows the results of a field application test in a certain unit of Xinjiang Oilfield Company. After treatment, the suspended solids content, oil content, and concentration of the drug added to the water all decreased significantly (the dosage of the drug was calculated according to the effective content).

[0025] Table 1 Comparison of water quality in field application tests of different agents

[0026]

Embodiment 2

[0028] The weight percent composition of the coagulant is 10% of aluminum sulfate, 10% of zinc sulfate, 0.5% of polydimethyl diallyl ammonium chloride, and the rest is water. This formula is suitable for the purification treatment of oily sewage containing hydrogen sulfide (<10mg / L), and the effect is stable. Table 2 shows the results of the simulated test of produced water purification in a certain unit of Xinjiang Oilfield Company. The results show that, compared with polyaluminum chloride (PAC), the dosage concentration (the dosage of the dosage is calculated according to the effective content) is reduced. Under these conditions, the suspended matter content, oil content and oil content of the treated water are significantly reduced, and it also has desulfurization effect.

[0029] Table 2 Comparison of water quality in field simulation tests of different agents

[0030]

[0031]

Embodiment 3

[0033] The weight percent composition of the coagulant is 20% of aluminum sulfate, 2% of zinc sulfate, 0.2% of polydimethyl diallyl ammonium chloride, and the rest is water. This formula is suitable for purification treatment of heavy oily sewage with high temperature. Table 3 shows the evaluation results of this coagulant on the purification effect of heavy oil sewage in a certain unit of Xinjiang Oilfield Company. The results show that when the dosage of the new oilfield sewage coagulant exceeds 120mg / L, the water quality after treatment has little difference, and the suspended solids The content and oil content have been reduced to a very low level. Compared with polyaluminum chloride (PAC), the content of suspended solids in the treated water is obviously lower under the same dosing concentration.

[0034] Table 3 Comparison of purification effects of different agents on heavy oil sewage

[0035]

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Abstract

The invention provides a novel oil field sewage disposal coagulant and relates to the oil field sewage disposal agent. The weight percentage of the coagulant is as follows: 10 to 20 percent of aluminum sulphate, 2 to 10 percent of zinc sulphate, 0.2 to 0.5 percent of PDMDAAC and the rest is water. The coagulant is used for purifying sewage containing hydrogen sulfide and oil, and high-temperature thick-oil sewage. The preparation method is comprises the following steps: 10 to 20 percent of aluminum sulphate and 2 to 10 percent of zinc sulphate are added into water and after the aluminum sulphate and zinc sulphate are completely dissolved, the 0.2 to 0.5 percent of PDMDAAC is added, and then the mixed solution is stirred evenly to adjust the pH value to 3 to 4 to so as to obtain the coagulant. With the same purified water quantity, the oil and suspended matter in the purified water are reduced dramatically with the coagulant, and the formed flocs is thicker and the settlement speed is quicker, and the impact on the purified water quality by the water quantity fluctuation can be reduced to a certain extent.

Description

technical field [0001] The invention relates to an oilfield sewage treatment agent, in particular to a novel oilfield sewage treatment coagulant. Background technique [0002] Compared with urban domestic sewage, oilfield sewage has higher requirements on the performance of water purification agents due to the complexity of its components. [0003] CN200410021527.9 discloses a sulfuric acid type composite water purifying agent for sewage purification treatment, the formula is: 30-50% of aluminum sulfate, 35-65% of magnesium sulfate, and 15-35% of zinc sulfate. [0004] CN200310110619 discloses a coagulant for swimming pools, which is composed of aluminum sulfate, polyferric sulfate, ferrous sulfate, polyacrylamide and the like. [0005] Although the hydrolysis reaction of traditional aluminum and iron salt flocculants is extremely fast, when used to treat oilfield sewage with emulsification, the water purification effect is not ideal, and the long-term stability of water qu...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 黄连华严忠张茂盛陈玉萍刘清明
Owner PETROCHINA CO LTD
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