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Recovering method for CO2 switch type solvent for treating oil-based drilling cuttings

A switch-type solvent and oil-based drilling cuttings technology, which is applied in the petroleum industry and the preparation of liquid hydrocarbon mixtures, etc., to achieve the effects of shortening the required time, low management costs, and improving water quality indicators

Active Publication Date: 2016-09-07
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the solvent is separated and recovered, oil-based drilling cuttings additives such as emulsifiers and fluid loss reducers have a protective effect on the colloids in the water. 2 Or air, heating and other physical methods are difficult to quickly and effectively achieve the separation of solvents

Method used

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  • Recovering method for CO2 switch type solvent for treating oil-based drilling cuttings
  • Recovering method for CO2 switch type solvent for treating oil-based drilling cuttings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Take a portion containing CO 2Add 2.1 g of solid sodium hydroxide to 42 g of the water phase of the switch-type solvent, stir and dissolve, and separate to obtain 6.25 g of the upper oil phase and the lower water phase. The water quality of the lower water phase is analyzed, see Table 1 for details.

Embodiment 2

[0031] Example 2: Take a portion containing CO 2 Add 4.2 g of solid sodium hydroxide to 42 g of the water phase of the switch-type solvent, stir and dissolve, and separate to obtain 8.75 g of the upper oil phase and the lower water phase. The water quality of the lower water phase is analyzed, see Table 1 for details.

Embodiment 3

[0032] Example 3: Take a portion containing CO 2 Add 2.1 g of solid calcium oxide to 42 g of the water phase of the switch-type solvent, stir and dissolve, and separate to obtain 4.38 g of the upper oil phase, the middle water phase, and the lower solid phase. The water quality of the middle water phase is analyzed, see Table 1 for details.

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PUM

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Abstract

The invention discloses a recovering method for CO2 switch type solvent for treating oil-based drilling cuttings. The recovering method includes the steps that solid sodium hydroxide is added into the water phase containing CO2 switch type solvent and stirred to be dissolved, and an upper layer oil phase and a lower water phase are separated; solid calcium oxide is added into the water phase obtained after separation and stirred to be dissolved, an upper layer oil phase, a middle layer water phase and a lower layer solid phase are separated out; the oil phase obtained through separation is the recovered CO2 switch type solvent. The time needed for recovering the solvent is greatly shortened, solvent recovering efficiency is effectively improved, quality of wastewater obtained after separation is improved well, and the recovering method can be used for pretreating organic amine wastewater.

Description

technical field [0001] The invention relates to a solvent recovery method, in particular to a CO 2 The invention discloses a method for recovering switch-type solvents, which belongs to the technical field of petrochemical high-oil-containing hazardous waste treatment. Background technique [0002] With the increasing development of unconventional energy such as shale gas and tight gas around the world, oil-based drilling fluid technology has become one of the key technologies for shale gas horizontal drilling. However, oil-based drilling cuttings will accumulate during the exploration and development of oil and gas resources. Because oil-based drilling cuttings contain pollutants such as petroleum hydrocarbons, heavy metals, and organic matter, they have been listed as national hazardous wastes (National Hazardous Waste List, HW08). [0003] If oil-based drilling cuttings are discharged directly without treatment, it will cause serious harm to the surrounding ecological e...

Claims

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Application Information

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IPC IPC(8): C10G1/04
CPCC10G1/045
Inventor 张太亮欧阳铖蔡丹
Owner SOUTHWEST PETROLEUM UNIV
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