Microemulsion and its preparation method and application and treatment method of oily drilling cuttings

A technology of microemulsion and degreasing agent, which is applied in the field of petroleum engineering drilling, can solve the problems of high transportation costs, impact, and high requirements for incineration equipment, and achieve the effect of saving transportation costs

Active Publication Date: 2020-09-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Microemulsion and its preparation method and application and treatment method of oily drilling cuttings
  • Microemulsion and its preparation method and application and treatment method of oily drilling cuttings

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preparation example Construction

[0027] According to the second aspect of the present invention, the present invention provides the preparation method of described microemulsion, this method comprises:

[0028] 1) Sodium chloride is dissolved in water to obtain an aqueous sodium chloride solution;

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

[0030] 3) mixing the aqueous sodium chloride 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, the co-surfactant and the oil phase, preferably, step 2) includes: first stirring the ionic surfactant and the co-surfactant, and then adding the The oil phase was continuously stirred until uniform.

[0033] In order to further avoid delamination of the microemulsion, preferably, step 3) i...

Embodiment 1

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

[0043] (1) configuration concentration is the sodium chloride aqueous solution of 2.5% by weight;

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

[0045] (3) Take 20 g of sodium chloride aqueous solution and 10 g of the mixed solution, stir with a magnetic stirrer until completely clear, and continue stirring for 1 h 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) configuration concentration is an aqueous sodium chloride solution of 3.0% by weight;

[0049] (2) Stir 8g fatty alcohol polyoxyethylene ether sodium sulfate and 6g amyl propionate evenly with a magnetic stirrer, then add 4g tetradecene and continue stirring 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 completely clear, and continue stirring for 1 h 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 for oily drilling cuttings. Background technique [0002] In recent years, with the reduction of easy-to-develop oil fields and the development of unconventional oil and gas reservoirs, drilling conditions have become very complex, 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 the pollution to the environment. The main reason is that a large amount of Oily drill cuttings. Oily drilling cuttings are a toxic substance with complex components, strong stability, and difficult to handle. The oil content is 5-20% or even higher. If they are disch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11D1/29C11D1/14C11D3/04C11D3/20C11D3/18C11D3/60C11D17/00E21B21/06E21B21/01
CPCC11D1/146C11D1/29C11D3/046C11D3/18C11D3/181C11D3/2093C11D11/0011C11D17/0021E21B21/01E21B21/06
Inventor 黄贤斌孙金声吕开河刘敬平
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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