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Microemulsion and preparation method and application thereof and treatment method of oil-containing drill cuttings

A technology of microemulsion and oil phase, which is used in earthwork drilling, chemical instruments and methods, preparation of detergent mixture compositions, etc., can solve the problems of expensive transportation, high requirements for incineration equipment, and influence, and save transportation. effect of cost

Active Publication Date: 2018-08-31
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the incineration method has high requirements on equipment, requires professional treatment plants to deal with, the transportation cost is expensive, and will produce polluting gases; the thermal distillation treatment efficiency is low, and there is also the problem of high transportation costs; microbial treatment methods (such as land cultivation methods) ) Although a higher oil removal rate can be obtained, the treatment time is long and a larger treatment site is required, and the treatment effect is easily affected by the environment (temperature, etc.)
In addition, although the drill cuttings reinjection technology used by some foreign companies can achieve real zero discharge, it not only requires very high technical requirements, but also this method may cause potential pollution to groundwater or oil layers, and is affected by formations and other reasons. All areas are suitable for cuttings reinjection

Method used

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preparation example Construction

[0027] According to the second aspect of the present invention, the present invention provides a preparation method of the microemulsion, the method comprising:

[0028] 1) Dissolve sodium chloride in water to obtain an aqueous solution of sodium chloride;

[0029] 2) Mixing the ionic surfactant, co-surfactant, and oil phase to obtain a mixed liquid;

[0030] 3) Mixing the sodium chloride aqueous solution with the mixed solution to obtain the microemulsion.

[0031] The mixing of step 2) and step 3) can be carried out under stirring conditions, and the stirring equipment can be a magnetic stirrer.

[0032] In order to further promote the uniform mixing of the ionic surfactant, co-surfactant and oil phase, preferably, step 2) includes: first mixing the ionic surfactant and co-surfactant uniformly, and then adding the The oil phase continues to be stirred until uniform.

[0033] In order to further avoid the stratification of the microemulsion, preferably, step 3) includes: first stirring...

Embodiment 1

[0042] This example is used to illustrate the microemulsion of the present invention and its preparation method.

[0043] (1) Prepare an aqueous sodium chloride solution with a concentration of 2.5% by weight;

[0044] (2) Mix 5 g of fatty alcohol polyoxyethylene ether sodium sulfate and 3 g of butyl propionate with a magnetic stirrer, and then add 2 g of 5# white oil and continue to stir until uniform to obtain a mixed solution;

[0045] (3) Take 20 g of sodium chloride aqueous solution and 10 g of the mixed solution, use a magnetic stirrer to stir until completely clear, and continue to stir for 1 hour to obtain a microemulsion.

Embodiment 2

[0047] This example is used to illustrate the microemulsion of the present invention and its preparation method.

[0048] (1) Prepare a sodium chloride aqueous solution with a concentration of 3.0% by weight;

[0049] (2) Mix 8 g of fatty alcohol polyoxyethylene ether sodium sulfate and 6 g of pentyl propionate with a magnetic stirrer, and then add 4 g of tetradecene and continue to stir until uniform to obtain a mixed solution;

[0050] (3) Take 25 g of sodium chloride aqueous solution and 13 g of the mixed solution, stir with a magnetic stirrer until it is completely clear, and continue to stir for 1 hour to obtain a microemulsion.

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Abstract

The invention relates to the field of petroleum engineering drilling, and discloses a microemulsion and a preparation method and application thereof and a treatment method of oil-containing drill cuttings. The microemulsion comprises 15 to 25% by weight of an ionic surfactant, 5 to 20% by weight of a co-surfactant, 1 to 2.5% by weight of sodium chloride, 5 to 10% by weight of an oil phase and 55 to 65% by weight of water, the ionic surfactant is selected from at least one of sodium lauryl ether sulfate, fatty alcohol polyoxyethylene ether sulfate, and sodium lauryl sulfate; and the co-surfactant is at least one selected from the group consisting of butyl lactate, butyl acetate, propyl acetate, and amyl propionate. The microemulsion has ultra-low interfacial tension between drilling fluid base oil, and can effectively reduce the oil content of the drill cuttings. In addition, the microemulsion has the characteristics of superconcentration, and can save its own transportation cost.

Description

Technical field [0001] The invention relates to the field of petroleum engineering drilling, in particular to a microemulsion, a preparation method and application thereof, and a treatment method of oil-containing drill cuttings. Background technique [0002] In recent years, with the decrease of easy-to-develop oil fields and the development of unconventional oil and gas reservoirs, drilling conditions have become very complicated, and the performance requirements for drilling fluids have also become higher and higher. Oil-based drilling fluids are more and more widely used because they have more outstanding performance than water-based drilling fluids. However, the biggest disadvantage of oil-based drilling fluids is environmental pollution. The main reason is that a large amount of Oily drill cuttings. Oil-bearing drill cuttings are a toxic substance with complex composition, strong stability, and difficult to handle. The oil content is 5-20% or even higher. If it is discharg...

Claims

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Application Information

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IPC IPC(8): C11D1/29C11D1/14C11D3/04C11D3/20C11D3/18C11D3/60C11D17/00E21B21/06E21B21/01
CPCE21B21/01E21B21/06C11D1/146C11D1/29C11D3/046C11D3/18C11D3/181C11D3/2093C11D17/0021C11D2111/10
Inventor 黄贤斌孙金声吕开河刘敬平
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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