Membrane-method seawater desalination pretreatment system of offshore thickened oil thermal recovery steam-injection boiler

A technology for steam injection boiler and heavy oil thermal recovery, which is applied in seawater treatment, multi-stage water treatment, water/sewage treatment, etc. The effect of compact structure, strong impact resistance and stable water quality

Pending Publication Date: 2021-04-30
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention is aimed at the large content of sea cement and sand, large fluctuations in water quality, poor impact resistance of the existing pretreatment process centered on organic ultrafiltration membranes, low tolerance to suspended particles, organic matter, and microorganisms, and short service life. The water quality is stable, and the process before the organic ultrafiltration membrane enters the membrane is complicated, the process is long, and the floor area is large.

Method used

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  • Membrane-method seawater desalination pretreatment system of offshore thickened oil thermal recovery steam-injection boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: apply this technology at a certain platform in Bohai Sea. The average seawater temperature is 2.1°C, the average seawater turbidity is 105.6NTU, the average conductivity is 46000, and the average total dissolved solids (TDS) is 31.5g / L.

[0026] The membrane method seawater desalination pretreatment system of the offshore heavy oil thermal recovery steam injection boiler in this example, the processing steps are:

[0027] Sea water inflow 106.4m 3 / h, enter the settling tank and stay for 30 minutes to remove the sediment and large-size impurities in the seawater, and the water production is 104.27m 3 / h; the water produced in the settling tank is added with 0.55kg / h ferric chloride and 3kg / h chloramine through the pipeline mixer, and then enters the multi-media filter to remove flocs, and the water produced is 102.18m 3 / h; the produced water enters the ceramic ultrafiltration membrane system, the concentration ratio is 10, and the produced water volume ...

Embodiment 2

[0028] Embodiment 2: this technology is applied in a certain platform in Bohai Sea. The average seawater temperature is 13.5°C, the average seawater turbidity is 93.4NTU, the average conductivity is 45500, and the average total dissolved solids (TDS) is 32.1g / L.

[0029] The membrane method seawater desalination pretreatment system of the offshore heavy oil thermal recovery steam injection boiler in this example, the processing steps are:

[0030] Sea water inflow 105m 3 / h, enter the settling tank and stay for 30 minutes to remove the sediment and large-size impurities in the seawater, and the water production is 103m 3 / h; the water produced in the settling tank is added with 0.55kg / h ferric chloride and 3kg / h chloramine through the pipeline mixer, and then enters the multi-media filter to remove flocs, and the water produced is 101m 3 / h; the produced water enters the ceramic ultrafiltration membrane system, the concentration ratio is 10, and the produced water volume is ...

Embodiment 3

[0031] Embodiment 3: apply this technology at a certain platform in Bohai Sea. The average seawater temperature is 28.1°C, the average seawater turbidity is 81.4NTU, the average conductivity is 45300, and the average total dissolved solids (TDS) is 30.1g / L.

[0032] The membrane method seawater desalination pretreatment system of the offshore heavy oil thermal recovery steam injection boiler in this example, the processing steps are:

[0033] Sea water inflow 104m 3 / h, enter the settling tank and stay for 30 minutes to remove the sediment and large-size impurities in the seawater, and the water production is 102m 3 / h; the water produced in the settling tank is added with 0.55kg / h ferric chloride and 3kg / h chloramine through the pipeline mixer, and then enters the multi-media filter to remove flocs, and the water produced is 100m 3 / h; the produced water enters the ceramic ultrafiltration membrane system, the concentration ratio is 10, and the produced water volume is 90m ...

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Abstract

The invention discloses a membrane-method seawater desalination pretreatment system of an offshore thickened oil thermal recovery steam-injection boiler. The system comprises a settling tank, a pipeline mixer, a multi-medium filter and a ceramic ultrafiltration membrane system which are connected in sequence. According to the ceramic ultrafiltration membrane system, the filtering mode is cross-flow filtering, and the concentration multiple of concentrated water is 5-10. The membrane -method seawater desalination pretreatment system uses the ceramic ultrafiltration membrane as an ultrafiltration core membrane material, optimizes the pretreatment process, improves the seawater pretreatment effect and impact resistance, can better adapt to the fluctuation of seawater quality, simplifies the operation, and has the advantages of compact structure, high automation degree and small ground area, moreover, the quality of produced water is stable, the turbidity of the produced water is less than 1NTU, the SDI15 is less than 5, and the water inlet requirement of the reverse osmosis membrane is met.

Description

technical field [0001] The invention relates to the technical field of seawater desalination pretreatment, in particular to a membrane method seawater desalination pretreatment system used for steam injection boilers for thermal recovery of heavy oil at sea. Background technique [0002] Heavy oil accounts for a large proportion in my country's offshore oilfields, and more than 50% of crude oil production comes from heavy oil reservoirs. In recent years, with the discovery and verification of heavy oil reserves with poor grade and low production capacity in my country's offshore oil areas, how to effectively develop and utilize such resources will be an important basis for achieving offshore oil and gas production targets and sustainable production. By exploring the relevant research and application of offshore heavy oil thermal recovery, the results show that thermal recovery can significantly improve the heavy oil recovery rate and recovery rate. [0003] Offshore heavy o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/08
CPCC02F9/00C02F1/5281C02F2001/007C02F1/50C02F1/001C02F2301/08C02F1/444C02F1/56C02F1/5236C02F1/76C02F2103/08Y02A20/131
Inventor 陈赞刘宗园李阳于海斌王林江张树友田莉臧毅华郑秋红吴巍佟建超
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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