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Energy-saving and consumption-reducing method for supercritical water oxidation treatment of oil-based drilling cuttings in oil and gas fields

A technology of supercritical water oxidation and oil-based drilling cuttings, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve the problems of wasting water resources at the well site, large equipment wear, and inconvenient operation, etc. Achieve the effect of low cost, small equipment wear and convenient operation

Inactive Publication Date: 2018-12-11
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are two problems in the process of using supercritical water oxidation technology to directly process oil-based cuttings: one is that oil-based cuttings contain 50-85% solid particles, which will easily lead to large equipment wear and inconvenient operation; Second, the high-temperature fluid (300-600°C) discharged from the supercritical water oxidation reactor needs to be cooled by cooling water, which not only wastes water resources at the well site, but also causes waste of heat

Method used

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  • Energy-saving and consumption-reducing method for supercritical water oxidation treatment of oil-based drilling cuttings in oil and gas fields

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Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1 (laboratory scale)

[0023] Treatment object: Oil-based cuttings of a shale gas vertical well, with an oil content of 20.6% by mass.

[0024] The specific implementation steps are as follows: three immersion kettles are used in parallel for immersion. 1 kg of oil-based drilling cuttings is placed in the intermittent immersion kettle 2, the high-temperature and high-pressure water from the buffer tank 4 is reduced to 11MPa by the pressure reducing valve A3, and passes through the immersion kettle at a flow rate of 0.5 liters / hour. The average temperature is maintained at about 315°C. After 30 minutes, the immersion is completed and switched to another immersion tank 2; the organic wastewater generated by immersion is cooled by the cooler 1 to below 50°C, and the pressure is reduced by the pressure reducing valve B 6 to normal pressure and stored in the liquid storage tank 7; the high-pressure pump 8 pressurizes the organic wastewater in the liquid storage t...

Embodiment 2

[0025] Embodiment 2 (laboratory scale)

[0026] Treatment object: oil-based cuttings of a shale gas horizontal well, with an oil content of 13.2% by mass.

[0027]The specific implementation steps are: two immersion kettles are used in parallel for immersion. 3 kg of oil-based drilling cuttings are placed in the intermittent immersion kettle 2, and the high-temperature and high-pressure water from the buffer tank 4 is decompressed to 15MPa by the pressure reducing valve A3, and passes through the immersion kettle at a flow rate of 2 liters / hour. The average temperature is maintained at about 345°C. After 60 minutes, the immersion is completed and switched to another immersion tank 2; the organic wastewater generated by immersion is cooled by the cooler 1 to below 50°C, and decompressed by the pressure reducing valve B 6 to normal pressure and stored in the liquid storage tank 7; the high-pressure pump 8 pressurizes the organic wastewater in the liquid storage tank 7 to 26MPa,...

Embodiment 3

[0028] Embodiment 3 (laboratory scale)

[0029] Treatment object: oil-based cuttings of a shale gas horizontal well, with an oil content of 18.6% by mass.

[0030] The specific implementation steps are as follows: the leaching process in the leaching kettle is continuous. 3 kg of oil-based drill cuttings are placed in the intermittent immersion kettle 2, and the high-temperature and high-pressure water from the buffer tank 4 is decompressed to 1 MPa by the pressure reducing valve A3, and passes through the immersion kettle at a flow rate of 2 liters / hour, immersing The average temperature is maintained at about 50°C, and the leaching is completed after 200 minutes; the organic wastewater generated by leaching is cooled to below 50°C by the cooler 1, depressurized to normal pressure by the pressure reducing valve B6, and stored in the liquid storage tank 7 Inside; the high-pressure pump 8 pressurizes the organic wastewater in the liquid storage tank 7 to 30MPa, and after being...

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Abstract

The invention discloses an energy-saving and consumption-reducing method for supercritical water oxidation treatment of oil-based drilling cuttings in oil and gas fields, which comprises two parts: hot dipping of oil-based drilling cuttings and supercritical water oxidation of organic waste water. Firstly, the waste heat high-temperature fluid generated by supercritical water oxidation of organic waste water is used to elute the organic matter in the oil-based drilling cuttings in the immersion tank and transfer it to water to form organic waste water; the organic waste water is pressurized and preheated, and then mixed with the oxidant Enter the supercritical water oxidation reactor to completely oxidize and degrade the organic pollutants; the solid-liquid products are discharged from the slag outlet of the reactor, and the gas-liquid products are discharged from the upper outlet of the reactor through the buffer tank into the immersion tank to start the next cycle. The present invention does not introduce additional energy consumption, changes the treatment object from oil-based drilling cuttings to organic wastewater, reduces the difficulty of supercritical water oxidation treatment, reduces equipment wear caused by the presence of solid particles in oil-based drilling cuttings, and saves The cooling water required for cooling the high-temperature fluid is reduced, and the goal of energy saving and consumption reduction is achieved.

Description

technical field [0001] The invention relates to a treatment method for oil-based drilling cuttings in oil and gas fields, in particular to an energy-saving and consumption-reducing method for supercritical water oxidation treatment of oil-based drilling cuttings in oil and gas fields, and belongs to the technical field of chemical and environmental protection. Background technique [0002] Oil-based drilling cuttings are organic solid wastes caused by the use of oil-based drilling mud during the exploration and production of various oil and gas fields. Compared with other industrial solid wastes or wastewater, they have the characteristics of small output and far away from cities or people's residences. In the initial offshore drilling platforms and inland oil fields, most of them were abandoned in the sea or piled up on the spot. Since the 1970s, the hazards of drilling waste have gradually attracted attention. Especially after 2000, the impact of drilling cuttings on the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00B09B3/20
Inventor 陈忠徐愿坚姚光华陈则良陈鸿珍王光伟陈乔
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI