Nano microemulsion, and preparation method and application thereof

A nano-micro-emulsion and micro-emulsion technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of expansion and collapse of the well wall and the limitation of high temperature resistance of filtrate reducers, so as to prevent the collapse of the well wall. , Improve suspension stability and rock-carrying ability, good high temperature resistance

Active Publication Date: 2016-03-02
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a nano-microemulsion and its preparation method and application, which are used to overcome the limitations of the high temperature resistance of the fluid loss reducer in the prior art, and avoid the increase of the fluid loss when the temperature is higher than 200 ° C and cause the well wall The occurrence of problems such as expansion and collapse

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  • Nano microemulsion, and preparation method and application thereof
  • Nano microemulsion, and preparation method and application thereof
  • Nano microemulsion, and preparation method and application thereof

Examples

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Embodiment 1

[0039] 1. Modification of silicate

[0040] In a constant temperature water bath at 30°C, 50 parts by weight of kaolin with a particle size of 2.5 μm was added to 1.5 L of deionized water, controlled at a rotational speed of 500 r / min, and stirred evenly.

[0041] Nitrogen is fed into the system, and at 70°C, 45 parts by weight of the modifier aqueous solution is dropped into 40 parts by weight of the silicate solution, and the dropping rate of the modifier aqueous solution is controlled to be 10ml / min, and the manufacturing speed is 500r / min. After 16 h, the reaction was stopped. The reaction solution was filtered, and the filter cake was rinsed with water until the filtrate was washed with 0.1mol / LAgNO 3 After the solution detected no white precipitate, the filter cake was dried in a vacuum oven at 90° C. for 15 hours until constant weight, ground, and set aside. Wherein, the modifier aqueous solution includes cetyltrimethylammonium bromide, dioctadecyldimethylammonium bro...

Embodiment 2

[0052] 1. Modification of silicate

[0053] In a constant temperature water bath at 40°C, add 60 parts by weight of a mixture of montmorillonite and hydrotalcite with a particle size of 0.9 μm into 1.5 L of deionized water, control the rotation speed at 200 r / min, and stir evenly.

[0054] Nitrogen is fed into the system, and at 60°C, 60 parts by weight of the modifier aqueous solution is dropped into 60 parts by weight of the silicate solution, and the dropping rate of the modifier aqueous solution is controlled to be 8ml / min, and the manufacturing speed is 800r / min. After 16 h, the reaction was stopped. The reaction solution was filtered, and the filter cake was rinsed with water until the filtrate was washed with 0.1mol / LAgNO 3 After the solution detected no white precipitate, the filter cake was dried in a vacuum oven at 60° C. for 20 h until constant weight, ground, and set aside. Wherein, the modifier aqueous solution includes cetyltrimethylammonium bromide, dioctadecy...

Embodiment 3

[0063] 1. Modification of silicate

[0064] In a constant temperature water bath at 40°C, 60 parts by weight of layered silica with a particle size of 3.0 μm was added to 1.0 L of deionized water, controlled at a rotational speed of 400 r / min, and stirred evenly.

[0065] Nitrogen is fed into the system, and at 50°C, 20 parts by weight of the modifier aqueous solution is dropped into 50 parts by weight of the silicate solution, and the dropping rate of the modifier aqueous solution is controlled to be 12ml / min, and the rotational speed is controlled to be 800r / min. After 18 h, the reaction was stopped. The reaction solution was filtered, and the filter cake was rinsed with water until the filtrate was washed with 0.1mol / LAgNO 3 After the solution detected no white precipitate, the filter cake was dried in a vacuum oven at 70° C. for 30 h until constant weight, ground and set aside. Wherein, the modifier aqueous solution includes cetyl trimethyl ammonium bromide, tetradecyl t...

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Abstract

The invention provides a nano microemulsion, and a preparation method and an application thereof. The preparation method comprises the following steps: 1) mixing 20-40 parts by weight of a mixed monomer, 0.01-0.2 part by weight of a protective agent and 15-30 parts by weight of water, adding 0.05-0.5 part by weight of modified silicate with the interlamellar spacing of 2-4 nm, and thus obtaining a first mixed solution, wherein the mixed monomer at least comprises acrylamide, sodium allysulfonate and sodium styrenesulfonate; 2) adding 10-25 parts by weight of a surfactant to 15-50 parts by weight of a solvent, to obtain a second mixed solution; and 3) adding 8-12 parts by weight of the first mixed solution to 15-25 parts by weight of a second mixed solution, to obtain a microemulsion; and adding 0.4-2 parts by weight of an initiator aqueous solution to 40-200 parts by weight of the microemulsion, carrying out an oscillating reaction at the temperature of 40-70 DEG C, and thus obtaining the nano microemulsion. The nano microemulsion has a good effect on reducing filtration loss under high-temperature and high-salt conditions.

Description

technical field [0001] The invention relates to oil extraction technology, in particular to a nano microemulsion and its preparation method and application. Background technique [0002] With the increase of the world's energy demand and the development of drilling technology, the production of shallow buried oil and gas can no longer meet the actual demand, and deep and ultra-deep oil and gas have become an inevitable trend. However, deep and ultra-deep oil reservoirs are in a high temperature and high pressure environment. When the drilling fluid circulates in the well, it will be affected by the high temperature and high pressure of the formation, resulting in degradation, excessive water loss, invasion of formation pores or leakage, resulting in expansion and shrinkage of the wellbore. Adhesion to the wall or accumulation of cuttings, etc., resulting in major accidents such as drilling tool adhesion, increased migration resistance, pipe sticking and blowout accidents. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/56C08F228/02C08F212/14C09K8/035
Inventor 柯扬船白云峰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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