Deep purification method and device for oilfield produced water

A technology for deep purification and production of water, applied in chemical instruments and methods, oil/oily substance/float removal devices, mining wastewater treatment, etc. Effect, simple equipment, simple effect of separation process

Pending Publication Date: 2021-04-09
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method solves the shortcomings of short equipment operation period and incomplete removal of fine suspended solids and total oil in oilfield produced water in the existing process

Method used

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  • Deep purification method and device for oilfield produced water
  • Deep purification method and device for oilfield produced water
  • Deep purification method and device for oilfield produced water

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Effect test

Embodiment 1

[0074] An oilfield produced water treatment device with a processing capacity of 20 cubic meters per hour was built in an oilfield in Karamay, Xinjiang. The process technology of the present invention was used for experiments, and the air flotation tank, fluidized bed separator and fiber coalescer were used for treatment, mainly to remove oilfield produced water. The suspended solids and oils in it were analyzed by detecting the indicators at the outlets of different devices to investigate the purification effect of the experiment.

[0075] 1. Material properties and related parameters of oilfield produced water

[0076] The oilfield produced water is a liquid-solid two-phase mixture. The water contains fine particles and a large amount of oil substances; the content of suspended solids is 1512mg / L, and the content of oil substances is 1826mg / L. The main substances are organic compounds of alkanes and aromatic hydrocarbons. substance.

[0077] 2. Oilfield produced water deep ...

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Abstract

The invention relates to a deep purification method and device for oilfield produced water. The deep purification method for oilfield produced water comprises the following steps: (i) feeding the oilfield produced water having been conditioned by a chemical into an air floatation tank for preliminary treatment so as to remove floating oil and large-particle suspended matters in the oilfield produced water; (ii) feeding the oilfield produced water having been subjected to primary treatment into an intermediate water tank for pressure stabilizing treatment; (iii) feeding the oilfield produced water having been subjected to pressure stabilization into a fluidized-bed separator to remove fine particles and dispersed oil drops in the water; (iv) sending the oilfield produced water having been treated by the fluidized-bed separator to a fiber coalescer for deep purification so as to remove residual emulsified oil in the water; and (v) after the fluidized-bed separator has been operated for a period of time and a pressure difference reaches 0.3 MPa, mixing the oilfield produced water with air, and reversely feeding the formed mixture to regenerate a separation medium of the fluidized-bed separator. The invention further provides a deep purification device for the oilfield produced water.

Description

technical field [0001] The disclosure belongs to the technical field of refractory sewage treatment and reuse, and provides a deep purification method and device for oilfield produced water, which is suitable for removing fine suspended matter and oil in oilfield produced water. Specifically, the present disclosure provides a combined separation method and device for deep purification of oilfield produced water by combining fluidized bed separation technology and fiber coalescence technology. Background technique [0002] my country's oil and gas field water mainly includes surface water, groundwater and oil extraction wastewater. With the continuous increase of domestic oil recovery, many oil fields have entered the stage of high water-cut exploitation, and the comprehensive water cut of some oil fields even exceeds 90%. If the produced water is treated and used for reinjection, it can not only meet the increasing demand for water injection in the oil extraction process, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/10
CPCC02F9/00C02F1/24C02F1/40C02F1/56C02F1/66C02F2103/10
Inventor 吕文杰党志宏汪华林纪玉杰陈建琦马红鹏马世浩刘冰胡斌
Owner EAST CHINA UNIV OF SCI & TECH
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