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Inorganic membrane advanced treatment equipment for condensate oil sewage in offshore gas fields and its use method

An advanced treatment and inorganic membrane technology, applied in the direction of osmosis/dialysis water/sewage treatment, mining wastewater treatment, separation methods, etc., can solve problems such as high cost, complicated process, and reduce the content of organic biotoxic substances, so as to avoid costs The effect of high and simplified equipment structure

Active Publication Date: 2018-06-26
CHINA NAT OFFSHORE OIL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art. Based on the problems of the traditional gas field condensate oil sewage treatment method with complex flow, high cost, large equipment footprint, and water production that cannot meet the requirements, an inorganic membrane offshore water treatment method is provided. Gas field condensate oil sewage advanced treatment equipment, through inorganic membrane technology to carry out advanced treatment of condensate oil sewage treated by traditional methods, further reduce the oil content of sewage, and reduce the content of organic biotoxic substances; at the same time, while maintaining perfect equipment functions Simplify the equipment structure and provide convenience for the design, construction and arrangement of the equipment on the platform

Method used

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  • Inorganic membrane advanced treatment equipment for condensate oil sewage in offshore gas fields and its use method
  • Inorganic membrane advanced treatment equipment for condensate oil sewage in offshore gas fields and its use method

Examples

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Embodiment 1

[0024] Example 1: The raw water of the equipment is the outlet water of the air flotation separator on the offshore gas field platform, with an oil content of 50-120 mg / L and an organic biotoxic substance content of >90 mg / L. The membrane filtration unit is set as three uses and one standby, and the membrane element adopts an inorganic ceramic membrane with a pore size of 45nm. After the advanced treatment of the equipment, the oil content of the produced water is less than 25mg / L, which meets the sea discharge standard stipulated in the Class I sea area in GB 4914-2008, and the content of organic biotoxic substances is 9.5mg / L.

Embodiment 2

[0025] Example 2: The raw water of the equipment is the inlet water of the air flotation separator of the offshore gas field platform, the oil content is >550mg / L, and the content of organic biotoxic substances is >90mg / L. The membrane filtration unit is set as three-purpose and one-standby, and the membrane element adopts a hydrophilic inorganic ceramic-based functional membrane with a pore size of 45 nm and a surface modified by polymer hydrophilicity. After the advanced treatment of the equipment, the oil content of the produced water is 10-15mg / L, which meets the sea discharge standard stipulated in the Class I sea area in GB 4914-2008, and the content of organic biotoxic substances is 9.5mg / L.

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Abstract

The invention discloses an inorganic membrane advanced treatment device for submarine gas field gas condensate sewage. The inorganic membrane advanced treatment device is mainly composed of a raw water tank, a raw water pump, a plurality of groups of membrane filter units, a liquid discharging pump, a concentrated liquor recovering tank, a washing tank and a washing pump, wherein the raw water pipeline is connected with a concentrated liquor pipeline after being connected with the plurality of groups of membrane filter units in parallel; the concentrated liquor pipeline is respectively connected with the top of the raw water tank and the concentrated liquor recovering tank; a raw water inlet valve, a raw water outlet valve and a membrane filter unit bypass valve are respectively arranged between each group of membrane filter units and the raw water pipeline; the top of each group of membrane filter units is connected with a top discharging pipeline, and the top discharging pipeline is connected with the raw water tank and the washing tank. The invention also discloses an application method of the inorganic membrane advanced treatment device for the submarine gas field gas concentrate sewage. By adopting the inorganic membrane advanced treatment device, the gas concentrate sewage treatment effect can be guaranteed, the structure of the device is simplified, the treatment cost is reduced, and the gas concentrate with high additional value is recycled.

Description

Technical field: [0001] The invention belongs to membrane separation treatment technology for oily sewage, and in particular relates to an inorganic membrane advanced treatment equipment for condensate oily sewage in an offshore gas field and a method for using it. Background technique: [0002] According to incomplete statistics, the proven reserves of my country's offshore oil and gas reservoirs exceed 100 billion cubic meters. As my country's energy problems intensify, the scale of offshore oil and gas development will become larger and larger. Usually, dehydrating agents such as ethylene glycol are needed to remove water from natural gas in the process of deep-water gas recovery, and a large amount of condensate oil-containing sewage is generated during the regeneration and reuse of dehydrating agents. Condensate oil usually has shorter carbon chain and smaller molecular weight, and the treatment of sewage containing condensate oil is more difficult than other types of o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/08B01D65/02C02F1/44C02F1/40
CPCB01D61/08B01D65/02B01D2321/02C02F1/40C02F1/44C02F2103/10
Inventor 陈赞于海斌刘宗园高鹏罗超滕厚开来远陈子婧吴巍王楚宁郑秋红李孝国
Owner CHINA NAT OFFSHORE OIL CORP