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Process for treating oil field water

A technology for treating process and oilfield water, which is applied in the field of comprehensive recovery and utilization treatment process, can solve the problems of ignoring the comprehensive recovery and utilization of resources, and achieve the effect of alleviating the tension of water resources

Inactive Publication Date: 2012-06-27
UNIVERSTAR SCI & TECH SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional treatment method focuses on removing the oil, but ignores the comprehensive recycling of resources

Method used

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  • Process for treating oil field water
  • Process for treating oil field water

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Embodiment Construction

[0018] The present invention will be described in further detail below in conjunction with the embodiments and with reference to the accompanying drawings.

[0019] A kind of oil field water treatment process, take following process step:

[0020] (1), the oilfield water passes through the sedimentation tank, adds alkali to adjust the pH=9, and then settles;

[0021] (2), the supernatant liquid prepared by step (1) is passed into a three-effect evaporating tank for vacuum evaporation, and the sodium chloride crystals crystallized out in the evaporating tank are centrifuged and dried to obtain solid sodium chloride;

[0022] (3) Heat and concentrate the salt-making mother liquor in the previous step. When the concentration of the salt-making mother liquor is 8 to 9 times, the salt-making mother liquor is discharged into the concentrated brine tank, and heated by secondary steam to increase the salt-making mother liquor by 4 to 6 times. Baumé degree, this time is concentrated b...

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Abstract

The invention discloses a process for treating oil field water. The process comprises the following process steps of: (1) allowing the oil field water to pass through a settling tank, adding alkali into the settling tank to adjust the pH value to be about 9, and settling; (2) after settling, allowing the oil field water to enter a multiple-effect evaporating tank to perform vacuum evaporation to produce solid sodium chloride; (3) further heating and concentrating salt-making mother liquor in the last step by using a concentrating tank to form concentrated halogen; (4) producing bromine by using the concentrated halogen; (5) settling the bromine-making mother liquor in the last step to produce calcium chloride dihydrate; and (6) reclaiming water from which the salt is extracted by the steps from (1) to (5) and using the water as industrial water. The process has the advantages of reclaiming useful resources, such as inorganic salt and the like, in the oil field water and greatly relieving water shortage in petroleum extraction regions.

Description

technical field [0001] The invention relates to a sewage treatment process, in particular to a comprehensive recovery and utilization treatment process for oilfield water containing relatively high levels of sodium, calcium, chlorine, bromine, and sulfate radicals. Background technique [0002] Oilfield water is the groundwater directly connected with the oil (gas) layer. It forms a unified fluid system with oil (gas). Oilfield water in a broad sense refers to groundwater in oil (gas) field areas, including oil (gas) layer water and non-oil (gas) layer water. Oilfield water, like oil and gas, exists in the pores, caves and fractures of the reservoir. In an oil and gas reservoir, oil, gas and water are usually contained, which are differentiated by gravity, with gas on top, oil in the middle, and water on the bottom, forming oil-gas, oil-water and gas-water interfaces. According to the relative position of oil (gas) and water, oilfield water is divided into bottom water an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01D3/04C01B7/09C01F11/24C02F1/66C02F1/04
Inventor 徐夷文秋红石教猛
Owner UNIVERSTAR SCI & TECH SHENZHEN
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