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Oil-based drilling cuttings extract, extraction method of oil-based drilling cuttings

A technology for oil-based drilling cuttings and extraction liquid, applied in the field of oil-based drilling cuttings extraction and oil-based drilling cuttings extraction liquid, can solve the problems of environmental pollution, strict safety requirements and high cost

Active Publication Date: 2018-03-02
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chen Yonghong and others pointed out in the "Overview of Waste Oil-based Drilling Fluid Treatment Technology and Its Application Technology" published by Oilfield Environmental Protection Impurities that the extraction agents used in China are mainly organic solvents such as hexane, ethyl acetate or chlorinated hydrocarbons, emphasizing that organic The use of solvents brings defects such as polluting the environment, strict safety requirements, and high costs

Method used

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  • Oil-based drilling cuttings extract, extraction method of oil-based drilling cuttings

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Experimental program
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Effect test

Embodiment 1

[0048] 1.1 Put 1000g of oil-based drilling cuttings in an oilfield into a container with a stirring facility, add 1500g of the above-mentioned C1 oil-based drilling cuttings extract with a mass ratio of M1 under constant stirring at a speed of 200rpm, and stir for 3 minutes to obtain solid-liquid The mixture; the solid-liquid mixture was centrifuged at 2500 rpm for 5 minutes to obtain a liquid phase and a solid phase.

[0049] 1.2 Add methanol to the upper liquid phase obtained in 1.1. The mass of methanol is 1% of the mass of the liquid phase, and let stand for 3 minutes to obtain an oil phase and an aqueous phase. The separated aqueous phase can be directly used for the next round of oil-based drilling cuttings extraction, which can be reused 14 times.

Embodiment 2

[0051] 2.1 Put 1000g of oil-based drilling cuttings in an oilfield into a container with a stirring facility, add 2000g of the above-mentioned C5 oil-based drilling cuttings extract with a mass ratio of M3 under constant stirring at a speed of 300rpm, and stir for 5 minutes to obtain a solid-liquid mixture; the solid-liquid mixture was centrifuged at 3500 rpm for 10 min to obtain an upper liquid phase and a lower solid phase.

[0052] 2.2 Add ethanol to the upper liquid phase obtained in 2.1. The mass of ethanol is 1.5% of the mass of the liquid phase, and stand for 4 minutes to obtain an oil phase and an aqueous phase. The separated aqueous phase can be directly used for the next round of oil-based cuttings extraction, which can be reused 15 times.

Embodiment 3

[0054] 3.1 Put 1000g of oil-based drilling cuttings in an oilfield in a container with stirring facilities, and add 1600g of the above-mentioned C5 oil-based drilling cuttings extract with a mass ratio of M5 under constant stirring at a speed of 300rpm, and stir for 5 minutes to obtain solid-liquid The mixture; the solid-liquid mixture was centrifuged at 3000 rpm for 8 minutes to obtain a liquid phase and a solid phase.

[0055] 3.2 Add butanol to the liquid phase obtained in 3.1, the mass of butanol is 2% of the mass of the upper liquid phase, and let it stand for 5 minutes to obtain an oil phase and a water phase. The separated aqueous phase can be directly used for the next round of oil-based drilling cuttings extraction, which can be reused 16 times.

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Abstract

The invention provides an oil-based drilling cuttings extract and an extraction method for oil-based drilling cuttings. The oil-based drilling cuttings extract comprises: an ionic liquid, a co-extraction agent and water; a mixture of the ionic liquid, a co-extraction agent and water The mass ratio is (3-5):1:(8-10). Compared with the prior art, the present invention utilizes the extraction and penetration properties of the ionic liquid and the emulsification properties of the co-extractant to extract and enrich the petroleum components in the oil-based cuttings into the oil-based cuttings extract; and, As a green solvent, ionic liquid can eliminate environmental pollution and safety problems caused by the use of volatile organic solvents, and realize low-cost and harmless treatment of oily solid waste.

Description

technical field [0001] The invention belongs to the technical field of drilling solid waste treatment in the oil and natural gas industry, and in particular relates to an oil-based drilling cuttings extraction liquid and an extraction method for oil-based drilling cuttings. Background technique [0002] During the development of oil and gas fields, a large amount of oil-based drilling fluid cuttings (abbreviation: oil-based cuttings) produced are listed as national hazardous wastes because they contain petroleum, heavy metals and other pollutants, and must be treated. In the ocean, the concentrated reinjection formation treatment method is widely used, which is very costly, and the requirements for the reinjection formation are also very strict. Due to the limitation of the formation space, suitable formations have to be found frequently. Due to the protection of groundwater and other underground resources and the limitations of technology and cost, land drilling at home and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G1/04
Inventor 单海霞何焕杰马金位华王中华王芹吕跃滨
Owner 中石化石油工程技术服务有限公司
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