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Treating method for desalting high-salt-content waste water in oil and gas field

A technology for high-salt wastewater, oil and gas fields, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The surrounding ecological environment, etc.

Inactive Publication Date: 2012-07-25
SICHUAN RENZHI PETROCHEMICAL TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limited self-purification ability of the river and the relatively long cycle, long-term enrichment will inevitably affect the surrounding ecological environment and cause environmental pollution
Especially the wastewater from oil and gas fields with high salinity is difficult to be effectively and thoroughly treated

Method used

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  • Treating method for desalting high-salt-content waste water in oil and gas field
  • Treating method for desalting high-salt-content waste water in oil and gas field
  • Treating method for desalting high-salt-content waste water in oil and gas field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Dosing per cubic meter of water according to the following formula: calcium hydroxide 0.8 kg, aluminum sulfate 2.5 kg, sodium carbonate 00.7 kg, polyacrylamide 0.002 kg, filter with a quartz sand filter and a precision filter in turn Afterwards, it is filtered with an ultrafiltration membrane, and then filtered with a reverse osmosis composite membrane. Treatment of water quality indicators such as figure 1 .

Embodiment 2

[0023] Embodiment 2: Treat the dosage of water per square meter according to the following formula: sodium hydroxide 0.6kg, polyaluminum chloride 1.9kg, sodium carbonate 0.9 kg, filter with quartz sand filter and precision filter successively and use ultrafiltration Membrane filtration, followed by reverse osmosis composite membrane filtration. Treatment of water quality indicators such as figure 2 .

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Abstract

The invention relates to a treating method for desalting high-salt-content waste water in an oil and gas field during exploration and transmission of oil and natural gas. The method comprises the following steps of: a, adding a hard water softener and a flocculant to waste water, wherein based on each stere of waste water, the addition amounts of the components are as follows: 0.5-0.9kg of hydroxide, 0.5-0.9kg of carbonate and 1.5-3.0kg of the flocculant; b, filtering the waste water by utilizing an ultra-filtration membrane, and filtering by sequentially utilizing a quartz sand filter and a fine filter; and c, carrying out a reverse osmosis desalination treatment on filtered water. According to the treating method for desalting the high-salt-content waste water in the oil and gas field, disclosed by the invention, through various forms and multi-level treatments, organic matters and soluble salt-type matters in water bodies of the oil and gas filed are effectively removed, and thus the chloride concentration of the high-salt-content waste water of the oil and gas field is less than 250mg / L, and other indexes of the high-salt-content waste water can meet first-level standard requirements of the Sewage Comprehensive Drainage Standard (GB8978-1996).

Description

technical field [0001] The invention relates to a treatment method for oil and gas field waste water in oil and natural gas exploration, production and transportation, in particular to a desalination treatment method for oil and gas field high-salt waste water. Background technique [0002] With the intensification of oil and gas exploration, the number of production and transportation wells is gradually increasing, and the amount of sewage is also increasing year by year. The most mature method for the treatment of wastewater generated in the process of oil and gas field production and transportation is chemical coagulation oxidation Conventional treatment methods cannot remove a large amount of soluble salts in wastewater well, and the amount of dosing is relatively large, resulting in high production costs and hidden dangers that threaten the surrounding ecological environment. At present, after the physical and chemical coagulation and oxidation treatment of the producti...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCY02A20/131
Inventor 卜文海姚兵袁海汪廷洪王官均王德龙
Owner SICHUAN RENZHI PETROCHEMICAL TECHNOLOGY CO LTD
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