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A kind of three-phase nanoemulsion with core-shell structure and its preparation method and application

A technology of nanoemulsion and core-shell structure, which is applied in the field of three-phase nanoemulsion and its preparation, can solve the problems of wellbore instability and lack of micro-crack formation, and achieve the prevention of formation collapse, wellbore instability and good lubricity Effect

Active Publication Date: 2020-05-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Various nanoemulsions currently developed have strong dispersibility, high emulsified film strength and high demulsification voltage, and have high stability under the conditions of high temperature, high pressure and high salt. Lack of effective plugging and suppression of micro-fractured formations, although the problem of drilling fluid lubricity has been solved, the problem of wellbore instability is still prominent

Method used

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  • A kind of three-phase nanoemulsion with core-shell structure and its preparation method and application
  • A kind of three-phase nanoemulsion with core-shell structure and its preparation method and application
  • A kind of three-phase nanoemulsion with core-shell structure and its preparation method and application

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Effect test

Embodiment 1

[0034] 20 g of sorbitan trioleate and 10 g of polyoxyethylene octylphenol ether were dissolved in 50 mL of methanol to obtain an oil phase. Slowly add 10g of 20% nano-silica aqueous solution into the oil phase, heat up to 50°C at a stirring speed of 100 rpm, and keep at this temperature for 6 minutes, so that the oil-in-water emulsion turns into light blue Transition body of oil core structure. Then 10g of 20% nano-silica aqueous solution, 20g of KCl and 50mL of water were uniformly mixed to obtain a water phase, and the transition body of the oil-core structure was added into the water phase to obtain a three-phase nanoemulsion with a core-shell structure.

Embodiment 2

[0036] 25 g of sorbitan trioleate and 5 g of polyoxyethylene octylphenol ether were dissolved in 50 mL of methanol to obtain an oil phase. Slowly add 10g of 40% nano-silica sodium hydroxide solution into the oil phase, heat up to 70°C at a stirring speed of 500 rpm, and keep at this temperature for 6 minutes to convert the oil-in-water emulsion into a light The transition body of the blue oil-core structure. Then 5g 40% nano-silica sodium hydroxide solution, 20g KCl and 50mL water were mixed uniformly to obtain an aqueous phase, and the transition body of the oil-core structure was added to the aqueous phase to obtain a three-phase phase with a core-shell structure nanoemulsion.

Embodiment 3

[0038] 15 g of sorbitan stearate and 15 g of polyoxyethylene sorbitan monooleate were dissolved in 50 mL of acetone to obtain an oil phase. Slowly add 10g of 40% nanometer calcium carbonate ethanol solution into the oil phase, heat up to 50°C at a stirring speed of 300 rpm, and keep at this temperature for 10 minutes, so that the oil-in-water emulsion turns into light blue Transition body of oil core structure. Then 10g 40% nano-calcium carbonate ethanol solution, 20g KNO 3 Mix evenly with 50mL of water to obtain a water phase, and add the transition body of the oil-core structure into the water phase to obtain a three-phase nanoemulsion with a core-shell structure.

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Abstract

The present invention provides a three-phase nanometer emulsion having a core-shell structure, wherein the three-phase nanometer emulsion comprises, by weight, 25 parts of water, 20-50 parts of an organic solvent, 1-20 parts of a nanometer core solution, 1-20 parts of a nonionic surfactant, 1-10 parts of an anionic surfactant, and 0-15 parts of an inorganic salt. The invention further provides a preparation method of the three-phase nanometer emulsion. The preparation method comprises: 1) dissolving a nonionic surfactant and an anionic surfactant in an organic solvent to obtain an oil phase; 2) adding a certain amount of a nanometer core solution to the oil phase obtained in the step 1), and carrying out constant temperature treatment to obtain a transition body having an oil core structure; and 3) mixing a certain amount of the nanometer core solution, an inorganic salt and water to obtain a water phase, and mixing the water phase and the transition body obtained in the step 2) to obtain the three-phase nanometer emulsion having the core-shell structure. The invention further relates to applications of the three-phase nanometer emulsion in the field of well drilling.

Description

technical field [0001] The invention relates to the field of petroleum drilling, in particular to a three-phase nanoemulsion with a core-shell structure and a preparation method and application thereof. Background technique [0002] At present, the main problems in deep well drilling at home and abroad are the wellbore instability in shale formations and the lubrication performance of drilling fluid in horizontal wells with long horizontal sections. At present, a series of studies have been carried out on drilling fluid lubricity and micro-fracture plugging according to the requirements of drilling speed, drill bit wear, wellbore stability and prevention of sticking accidents. By adding lubricants and plugging agents to the drilling fluid, the friction coefficient can be reduced and the plugging performance can be improved. However, these products have various problems in use, such as foaming, affecting the rheology of the drilling fluid, and the friction resistance is great...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03
CPCC09K8/03C09K2208/18C09K2208/34
Inventor 王西江李大奇何剑陈红壮
Owner CHINA PETROLEUM & CHEM CORP
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