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Method for removing organic pollutants in stratum by generating multi-element thermal fluid in situ

A multi-component thermal fluid and organic pollutant technology, applied in the field of formation organic pollutant removal, can solve problems such as increasing carbon emissions, and achieve the effects of improving permeability, improving heat utilization efficiency, and reducing the number of wells

Active Publication Date: 2022-02-18
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Exhaust gas from gas thermal desorption carries a lot of heat energy and increases carbon emissions

Method used

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  • Method for removing organic pollutants in stratum by generating multi-element thermal fluid in situ
  • Method for removing organic pollutants in stratum by generating multi-element thermal fluid in situ
  • Method for removing organic pollutants in stratum by generating multi-element thermal fluid in situ

Examples

Experimental program
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Effect test

Embodiment 1

[0068] Taking the chloroform asphalt contaminated soil block with higher boiling point as an example, the restoration method of the present invention is as follows.

[0069] Select a polluted soil plot with a length of about 20m, a width of 40m, a pollution thickness of about 7m, and a groundwater level of about 12-15m. The texture of the polluted area is mainly silt or fine silt, and the permeability coefficient is 0.5-5m / d.

[0070] Such as figure 1 As shown, in order to complete site restoration at low cost and high efficiency, a horizontal injection well with a length of 20 meters and a diameter of 25 cm is set in the middle of the site. Horizontal production wells are arranged on both sides of the site, the wells are 20 meters long and the diameter of the horizontal production wells is 17.8cm. The electric submersible pump is lowered into the horizontal production well or connected to the surface extraction pump. 18 observation wells are arranged in the middle of the si...

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Abstract

The invention discloses a method for removing organic pollutants in a stratum by generating multi-element thermal fluid in situ. The method comprises the following steps: 1) deploying a well pattern according to the size of a polluted area, wherein the well pattern comprises a horizontal injection well, a horizontal output well and a vertical observation well; 2) injecting fuel gas, pressurized combustion-supporting gas and water through the horizontal injection well, conducting electric ignition, and according to temperature feedback of a flame monitoring area, controlling injection of water and adjusting the temperature of the produced multi-element thermal fluid; 3) according to the underground combustion temperature of the horizontal injection well, the pressure in the horizontal injection well, a temperature in the horizontal output well, the temperature of the observation well, an underground vacuum degree and a target temperature acting on a repairing site, adjusting the injection amounts of the fuel gas, the pressurized combustion-supporting gas and the water; 4) allowing the horizontal output well to output an underground fluid containing organic pollutants in a negative pressure mode; and 5) treating the produced underground fluid containing the organic pollutants. According to the method, heat energy consumption and carbon emission can be greatly reduced, and a pollutant removal rate is increased.

Description

technical field [0001] The invention relates to the field of removing organic pollutants in formations, in particular to a method for generating multi-element thermal fluids in situ to remove organic pollutants in formations. Background technique [0002] Oil field operation areas, petrochemical plants, underground oil and gas depots, coking plants, coal-to-gas plants, and pesticide plants may discharge organic pollutants during production, storage, and transportation, including petroleum hydrocarbons, coal tar, creosote, Liquid organic pollutants including mineral oil, chlorinated organics, benzene series, polychlorinated biphenyls and solvents, and oil sludge. These organic pollutants seep into the ground, causing site pollution and endangering the ecological environment and human health. [0003] In-situ thermal desorption technology has been applied to the remediation of petroleum hydrocarbon organic pollution sites since the 1970s. Physicochemical properties, such as v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06
CPCB09C1/06B09C1/065B09C2101/00
Inventor 张胜飞李秀峦苟燕金瑞凤王红庄王伯军沈德煌张忠义
Owner PETROCHINA CO LTD
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