Super-amphiphobic Janus particles suitable for chip carrying agent for oil base drilling fluid and preparation method and application thereof

A silicon dioxide and particle technology, which is applied in the field of oil and gas drilling, can solve the problems of harsh dissolving properties of chip-carrying agents, complex production process of oil-soluble polymers, and high cost, so as to promote continuous exploration and development, increase speed and clean wellbore The effect of efficiency

Active Publication Date: 2019-02-22
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the drilling process of extended-reach wells and complex wells, it is difficult for water-wet cuttings to migrate with oil-based drilling fluids to form a "cuttings bed", especially in soil-free oil-based drilling fluids with weak gel strength. Serious potential safety hazards are caused. Conventional methods such as "optimizing the rheological parameters of drilling fluid, increasing the displacement of mud pumps, and movable drilling tools" are difficult to solve the above problems. Drilling speed
[0003] At present, the cuttings-carrying agents for oil-based drilling fluids developed at home and abroad are mainly flow regulators that change the rheological properties of oil-based drilling fluids. Conventional flow regulators mainly include organic soils and polymers. Soil is a chip-carrying agent obtained by modifying bentonite with an organic modifier, but this kind of chip-carrying agent modifier has a large amount and high cost; polymers are mainly used to improve the rheology of drilling fluid performance, improve its viscosity-increasing and cutting effect, and achieve the effect of chip-carrying and speed-up, but this kind of chip-carrying agent has problems such as strict solubility requirements and complicated production process of oil-soluble polymers.

Method used

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  • Super-amphiphobic Janus particles suitable for chip carrying agent for oil base drilling fluid and preparation method and application thereof
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  • Super-amphiphobic Janus particles suitable for chip carrying agent for oil base drilling fluid and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0074] The second aspect of the present invention provides a method for preparing Janus particles of silica, the method comprising:

[0075] (1) Partial surface of silicon dioxide nanoparticles is protected;

[0076] (2) In the first solvent, carry out the first contact reaction between the protected silica nanoparticles and the silane shown in formula (1), and then remove the solvent to obtain part of the surface modification provided by the silane shown in formula (1). The silica nanoparticles of the first modifying group; the first solvent is a mixed solvent containing alcohol and water;

[0077] (3) exposing the remaining surface of the protected silica nanoparticles;

[0078] (4) In the second solvent, carry out the second contact reaction with the silane shown in the formula (2) to the silica nanoparticles exposed on the remaining surface to modify the formula (2) on at least part of the remaining surface of the silica nanoparticles ) The second modified group provided...

preparation example 1

[0116] (1) The molar ratio of the reactants tetraethylenepentamine: linoleic acid=1:2.2 (that is, the molar ratio of the amount of tetraethylenepentamine in terms of primary amine groups to the amount of linoleic acid is 1:1.1) Mix and stir at 250r / min for 40min, then adjust the pH value of the obtained mixture to 9, then react at 230°C for 3 hours, while using a water separator to separate water, and then cool to room temperature;

[0117] (2) the reaction product of step (1) is mixed with malonic acid (the molar ratio of the consumption of tetraethylenepentamine and the consumption of malonic acid is 1:0.6), then the pH value of the mixture obtained is adjusted to 8, Then, the reaction was stirred at 90° C. for 6 hours at a speed of 400 r / min to obtain emulsifier A1. According to infrared, hydrogen nuclear magnetic resonance and carbon spectrum analysis, the emulsifier A1 contains amide groups, unsaturated double bonds and carboxyl groups, and has a comb structure.

Embodiment 1

[0119] This example is used to illustrate the superamphiphobic Janus particles of silica of the present invention and the preparation method thereof.

[0120] (1) 1g of SiO 2 Add nanoparticles (500 nm in diameter) and 20 g of paraffin balls (0.05 mm in diameter) into 100 mL of didodecyldimethylammonium bromide aqueous solution (concentration: 1 mg / mL) and keep stirring at 75 °C 60min, then cooled to room temperature (about 25°C), and filtered with water to repeatedly rinse the paraffin balls on the filter cake;

[0121] (2) Add the paraffin balls obtained in step (1) to 50 mL of 2% by weight ethanol aqueous solution, and add 0.8 g of 3-aminopropyltriethoxysilane, react at 25 ° C for 48 h, and then filter, And repeatedly rinse the paraffin ball on the filter cake with water and ethanol;

[0122] (3) Add the paraffin ball obtained in step (2) into 200 mL of dichloromethane, dissolve the wax ball at 40 ° C, and collect SiO by centrifugation 2 Nanoparticles were rinsed with dic...

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Abstract

The invention relates to the field of oil and gas drilling, in particular to super-amphiphobic Janus particles suitable for a chip carrying agent for an oil base drilling fluid and a preparation method and an application thereof. The Janus particles are silicon dioxide nanoparticles with dissymmetric modification on surfaces, wherein the part of surfaces of the Janus particles are modified by a first modifying group provided by silane as shown in a formula (1) and the rest parts of surfaces of the Janus particles are modified by a second modifying group provided by silane as shown in a formula(2). By combining the particularity of Janus particle structure and the performance asymmetricity, the particles play bubbling and stabilizing roles in an emulsified oil base drilling fluid. An efficiently chip carrying oil base drilling fluid system formed by taking the super-amphiphobic Janus particles chip carrying agent as a core treatment agent improves the drilling speed and the well purification efficiency of a complex well, thereby further promoting continuous exploration and development of irregular oil and gas reservoirs. The formulae are as shown in the description.

Description

technical field [0001] The invention relates to the field of oil and gas drilling, in particular to superamphiphobic Janus particles of silicon dioxide suitable for a debris-carrying agent for oil-based drilling fluids, and a preparation method and application thereof. Background technique [0002] As my country's exploration and development are increasingly developed on the premise of deeper formations, higher requirements are put forward for drilling technology, and more stringent requirements are put forward for the performance of drilling fluids. In the drilling process of extended-reach wells and complex wells, it is difficult for water-wet cuttings to migrate with oil-based drilling fluids to form a "cuttings bed", especially in soil-free oil-based drilling fluids with weak gel strength. Serious potential safety hazards are caused. Conventional methods such as "optimizing the rheological parameters of drilling fluid, increasing the displacement of mud pumps, and movabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/32
CPCC09K8/32C09K2208/10C09K2208/12
Inventor 蒋官澄倪晓骁高德利伍贤柱马光长孙金声蒲晓林杨丽丽王腾达史赫
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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