Zero-sewage discharge novel process for development of natural gas fields

A zero-discharge, natural gas technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as the inability to realize zero discharge of natural gas field sewage, and achieve stable treatment effects, The effect of high sewage reuse rate and wide application range

Active Publication Date: 2013-09-18
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of these can achieve zero discharge of sewage from natural gas field development, and the concentrated water and part of

Method used

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Examples

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Example Embodiment

[0017] A novel process for zero discharge of sewage from natural gas field development, including the following steps:

[0018] Step 1: Clean up and divert various sewage in the gas field

[0019] There are many types of sewage produced by the development of natural gas fields, and the pollutant composition of various sewage is different, and the pollution degree is also different. If the upstream sewage is not cleaned and separated, various types of sewage are mixed together, the water quality composition is more complicated, and the proportion of incoming water is unstable, resulting in large fluctuations in water quality, adding greater difficulties to the subsequent treatment process, and it is difficult to ensure the treatment effect.

[0020] Therefore, the zero-discharge combination process of natural gas field development requires first cleaning and diversion. According to the characteristics of various types of sewage water quality (such as pollutant composition, pollutant ...

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Abstract

The invention discloses a zero-sewage discharge novel process for development of natural gas fields. The zero-sewage discharge novel process comprises the following steps of: classifying sewage in a gas field into normal production sewage, domestic sewage, overhauling sewage, accident waste liquid, rainwater, production wastewater and gas field water, and collecting separately; next, guiding the normal production sewage, domestic sewage, overhauling sewage, accident waste liquid and initial rainwater to a biochemical treatment unit, guiding the production wastewater to an electrodialysis treatment unit and guiding the gas field water to a gas field water pretreatment unit; guiding all of up-to-standard sewage which is treated by the biochemical treatment unit previously and not completely recycled, concentrate generated after the treatment of the electrodialysis treatment unit and the gas field water treated by the gas field water pretreatment unit to an evaporative crystallization unit for advanced treatment; and after the quality of the water is up to the standard, recycling the water as make-up water for circulating cooling water or water for other production in the gas field, and separating out pollutants from the sewage in the form of crystalline salts, backfilling or recycling the crystalline salts, and finally, realizing zero discharge of the sewage.

Description

technical field [0001] The invention relates to the field of sewage treatment in the environmental protection technology, in particular to a novel process for zero discharge of sewage in the development of natural gas fields. Background technique [0002] The development of natural gas fields will produce a large amount of gas field water, production sewage, production wastewater and maintenance sewage. Gas field water is the formation water brought out from the gas well along with the natural gas during the gas production process and the condensed water produced by the separator due to the pressure change of the feed gas during the gas gathering and production process. Normal production wastewater refers to the production wastewater generated by the purification device during the natural gas purification process. The COD concentration is about 500mg / L. The main pollutants include methyldiethanolamine, sulfolane and triethylene glycol. Production wastewater refers to the se...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F9/10
Inventor 张永红蔡晓波连伟郭成华汤林班兴安童富良李静赵琼陈彰兵何蓉云杜通林肖芳汤晓勇曾彬曹乐季王海元甘永昌刘静何化杨洋李宇周宁陈国平李云龙肖华游凤英宋俊辉彭传丰符宇航刘昌辉蒋道利李波黄成王丹
Owner BC P INC CHINA NAT PETROLEUM CORP
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