Catalysis treatment method for oil field wastewater re-injection

A technology for oil field wastewater and catalytic treatment, applied in the direction of oxidized water/sewage treatment, etc., can solve the problems of high viscosity of sewage and difficult separation of oil and water, etc.

Inactive Publication Date: 2009-04-08
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the water produced by polymer flooding contains a considerable number of polymer molecules, the separated

Method used

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  • Catalysis treatment method for oil field wastewater re-injection
  • Catalysis treatment method for oil field wastewater re-injection
  • Catalysis treatment method for oil field wastewater re-injection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 Catalytic treatment experiment of oilfield wastewater under different gas-water ratios

[0022] In the catalytic reactor made of stainless steel, two partitions with micropores are placed in parallel, and two layers of 100ml catalysts of one or more oxides of Fe, Mn or Cu are filled respectively, and the water is fed intermittently by a water pump. 60°C, catalytic reaction time 10min, raw water after precipitation pretreatment water quality is volatile phenol 1.6mg / l, sulfide 4.7mg / l, SS 12.9mg / l and Fe 2+ 3.8mg / l, four different catalysts were used to further catalyze the wastewater under different gas-water ratios, and the results are listed in Table 1-Table 4.

[0023] Table 1. Catalytic treatment results of oilfield wastewater with different gas-water ratios by catalyst (FeMn)

[0024]

[0025] Table 2. Catalytic treatment results of oilfield wastewater with different gas-water ratios by catalyst (FeCu)

[0026]

[0027] Table 3. Catalytic treatmen...

Embodiment 2

[0032] Catalytic treatment experiment of oilfield wastewater under different aeration reaction time

[0033] In a heterogeneous catalytic reactor made of stainless steel, two partitions with micropores are placed in parallel, and two layers of 100ml catalysts of one or more oxides of Fe, Mn or Cu are filled respectively, and water is fed by a water pump. When the gas-water ratio is 0.5 / 1, the reaction temperature is 60°C, and the raw water is pretreated by precipitation, the water quality is 1.6mg / l of petroleum volatile phenol, 4.7mg / l of sulfide, 12.9mg / l of SS and Fe 2+ 3.8mg / l, four different catalysts were used for further catalytic treatment of wastewater under different aeration reaction times, and the results are listed in Table 5-Table 8.

[0034] Table 5. Catalytic treatment results of oilfield wastewater with different reaction times of catalyst (Fe Mn)

[0035]

[0036] Table 6. Catalytic treatment results of oilfield wastewater with different reaction times of...

Embodiment 3

[0042] Example 3 Comparison Experiment of Catalyst-Free Air Oxidation Treatment of Oilfield Wastewater

[0043]In a heterogeneous catalytic reactor made of stainless steel, two separators with micropores are placed in parallel. When no catalyst is loaded, water is fed by a water pump. The gas-water ratio is 0.5 / 1, the reaction time is 10 minutes, and the reaction temperature is 60 ℃, the quality of the raw water after precipitation pretreatment is 1.6mg / l volatile phenol, 4.7mg / l sulfide, 12.9mg / l SS and Fe 2+ 3.8mg / l, using no catalyst to further treat the wastewater, the results are listed in Table 9.

[0044] Table 9. Treatment results of oilfield wastewater by air oxidation with different aeration gas water ratios without catalyst

[0045]

[0046] From the above experimental results, it can be seen that the oilfield production wastewater is pretreated by sedimentation and then treated by air heterogeneous catalytic oxidation technology, and the effluent meets the requ...

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Abstract

The invention relates to the field of oil field waste water treatment and reinjection, in particular to the field of the catalytic treatment of the oil field polymer contained waste water reinjection. The catalyst used for the oil field waste water reinjection is one or a plurality of Fe oxide, Mn oxide or Cu oxide. The waste water firstly enters an aeration catalytic oxidation pond 1. A micropore aerator connected with an air compressor 4 is arranged on the bottom of the aeration catalytic oxidation pond 1; baffle plates with micropores are arranged above the aerator; and a catalyst layer is filled in each baffle plate. An aeration catalytic reaction is carried out through bottom aeration for 5 to 15 minutes in the aeration catalytic oxidation pond 1 in a gas water ratio of 0.3 to 1/1 at a temperature of between 40 and 65 DEG C. The outputted water is lifted into a catalytic reaction filter tank 2 by a water pump 5 for continuous catalytic oxidation and simultaneous filtration; and the water coming out of the pond 1 through the bottom enters a reinjection water tank 3. Two paralleled baffle plates with micropores are arranged in the catalytic reaction filter tank 2; each catalyst layer is filled in each baffle plate; the water feeding is carried out by the water pump; and the time of the catalytic reaction is 3 to 10 minutes. The catalytic reaction filter tank 2 is regularly backflushed by air and water for 1 to 2 times every day. The method has the advantages that the method has low running cost, no addition of a flocculant and a floating agent, and high practical application value; in addition, the air heterogeneous catalysis process has simple operation and moderate reaction conditions. The reaction is carried out at the normal temperature and normal pressure.

Description

technical field [0001] The invention relates to the field of oilfield wastewater treatment and reinjection, in particular to the field of catalytic treatment of oilfield wastewater containing polymers for reinjection. Background technique [0002] The produced wastewater produced in the process of petroleum exploitation mainly contains petroleum, volatile phenols, sulfides, Fe 2+ and other pollutants. It is difficult to use biochemical and other commonly used methods to control and meet the discharge standards, and new technical methods must be used to treat it. It is an effective way to solve this problem to make the treated oilfield sewage meet the requirements of polymer reinjection. At present, the treatment process for reinjecting produced water after treatment is mainly coagulation air flotation separation and fine filtration. Coagulation is to add a coagulant to the water to destroy the stable state of the colloidal particles in the water. Under certain hydraulic co...

Claims

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Application Information

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IPC IPC(8): C02F1/72
Inventor 肖羽堂
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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