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Desalination method for offshore thickened oil thermal recovery production water

A technology for thermal recovery of heavy oil and production of water, which is applied in general water supply conservation, mining wastewater treatment, chemical instruments and methods, etc. The effect of normal operation

Pending Publication Date: 2021-01-15
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to develop a desalination method for the production water produced by thermal recovery of offshore heavy oil in view of the technical problem that the existing offshore heavy oil thermal recovery production water is difficult to process and reuse

Method used

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  • Desalination method for offshore thickened oil thermal recovery production water

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Effect test

Embodiment 1

[0044] The average temperature of the front-end pretreatment water is 32°C, the average oil content is 3.5mg / L, the average suspended solids content is 0.8mg / L, and the total hardness (calculated as calcium carbonate) is 100mg / L. The incoming water enters the preheater A (E-0101) from c1 through the feed pump (P-0101), and the concentrated liquid produced by the gas-liquid separator (V-0102) enters E-0101 from a1; the water produced after heat exchange Exit from d1, enter preheater B (E-0102) from c2, steam condensate water produced by the shell side of evaporator (E-0103) exit from a3, enter E-0102 from a2; after heat exchange, the production water enters from d2 At the same time, compressed air enters the gas distributor at the bottom of E-0103 from g3, the air is discharged from the gas distributor and mixed with the production water at the bottom, and enters the evaporation tube of E-0103 together ; A small amount of steam generated by the steam generator and a large amoun...

Embodiment 2

[0046] The average temperature of the front-end pretreatment water is 35°C, the average oil content is 2.5mg / L, the average suspended solid content is 0.75mg / L, and the total hardness (calculated as calcium carbonate) is 110mg / L. The incoming water enters the preheater A (E-0101) from c1 through the feed pump (P-0101), and the concentrated liquid produced by the gas-liquid separator (V-0102) enters E-0101 from a1; the water produced after heat exchange Exit from d1, enter preheater B (E-0102) from c2, steam condensate water produced by the shell side of evaporator (E-0103) exit from a3, enter E-0102 from a2; after heat exchange, the production water enters from d2 At the same time, compressed air enters the gas distributor at the bottom of E-0103 from g3, the air is discharged from the gas distributor and mixed with the production water at the bottom, and enters the evaporation tube of E-0103 together ; A small amount of steam generated by the steam generator and a large amoun...

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Abstract

The invention provides a desalination method for offshore thickened oil thermal recovery production water. Air is introduced into an evaporator, so that scaling of the wall of an evaporation pipe canbe effectively prevented, and the heat transfer efficiency can be improved; an air exhaust valve is additionally arranged on a gas-liquid separator, so that hot air in the steam can be exhausted, andnormal operation of a roots compressor is guaranteed; before entering the evaporator, the production water exchanges heat with high-temperature strong brine and steam condensate in two stages, so thatenergy recovery is realized to the greatest extent, and a large amount of energy consumption is reduced; compared with a reverse osmosis technology, the method has the advantages that the requirements on inlet water temperature and inlet water quality are low, and when the inlet water quality fluctuates greatly, the method can still operate normally; and the method is compact in structure, high in energy utilization rate, high in scaling resistance and high in heat transfer efficiency, and is more suitable for desalination application on a production platform for offshore thickened oil thermal recovery.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to the treatment of water produced by thermal recovery of heavy oil in the sea, in particular to a desalination method for water produced by thermal recovery of heavy oil in the sea. Background technique [0002] my country is rich in offshore heavy oil resources. According to preliminary screening of heavy oil thermal recovery standards, geological reserves meeting thermal recovery conditions are as high as 9.8×10 8 m 3 , where the viscosity of formation crude oil is greater than 450mPa·s, and the geological reserves that have to be developed by thermal recovery reach 6.9×10 8 m 3 . The water treatment methods for heavy oil thermal recovery production are as follows: [0003] ① Transfer to the thin oil block as an effective water injection source to reinject the oil layer. But this method can only be used partly, because thin oil blocks also produce oily sewage,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C02F1/02C02F103/10
CPCC02F1/041C02F1/042C02F1/02C02F2303/10C02F2103/10Y02A20/124
Inventor 吴巍张明王海燕臧毅华朱国金王春升盛春光尚超王楚宁赵晓明
Owner CHINA NAT OFFSHORE OIL CORP
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