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Treatment process for oilfield water comprehensive recovery

A treatment process, oilfield water technology, applied in the field of comprehensive recycling treatment process, can solve the problems of neglecting the comprehensive recycling of resources, etc., 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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  • Description
  • Claims
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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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  • Treatment process for oilfield water comprehensive recovery
  • Treatment process for oilfield water comprehensive recovery

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the embodiments and with reference to the accompanying drawings.

[0022] A treatment process for comprehensive recovery and utilization of oilfield water, which takes the following process steps:

[0023] (1), the oil field water passes through the sedimentation pond, and in the pond, add 120% of the theoretical amount of thenardite needed for calcium sulfate with the calcium ions in the oilfield water, stir evenly, and add sodium hydroxide to adjust pH=about 10 simultaneously, Shen Qing;

[0024] (2), the precipitate prepared in step (1) is produced calcium sulfate by centrifugal drying and dehydration;

[0025] (3), 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;

[0026] (4), the salt-...

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Abstract

The invention discloses a treatment process for oilfield water comprehensive recovery. The process comprises the following steps of: (1) passing oilfield water through a settling tank, adding mirabilite into the tank, uniformly stirring the solution, adding alkali into the solution to regulate the PH to be about 10 at the same time, and settling; (2) preparing calcium sulfate from sediments prepared in step (1) by centrifugal drying and dehydration; (3) introducing supernatants prepared in step (1) into a multi-effect evaporation tank to perform vacuum evaporation and prepare solid sodium chloride; (4) further heating and concentrating salt-producing mother liquor in step (3) by using a concentration tank to obtain concentrated halogen; (5) preparing potassium chloride by using the concentrated halogen; (6) preparing crude bromine by using the mother liquor from the potassium chloride preparation and rectifying the crude bromine to prepare bromine; and (7) recycling the water of which salts are extracted in step (1) to step (6) to use the water as industrial water. The process has the advantages of recycling useful resources from the oilfield water, such as an inorganic salt and the like, and greatly relieving water shortages in oil exploitation areas.

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): C02F9/04C01B7/09C01F11/46C01D3/04C02F103/10
Inventor 徐夷文秋红石教猛
Owner UNIVERSTAR SCI & TECH SHENZHEN
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