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Reversible Pickering emulsion, its preparation method and reversible high-temperature high-density drilling fluid

A technology of Pickering emulsion and drilling fluid, which is applied in the field of drilling fluid, and can solve the problems of complex preparation process, unknown, no specific description of surfactant, etc.

Active Publication Date: 2021-03-02
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this system has the following technical problems. First, the system configuration process needs to wash and dry the solid particles in the nano-silica dispersion system containing oily primary amines and tertiary amine surfactants, and then use them as emulsified agent is added to the system, the preparation process is complicated
Second, the nanoparticles were not characterized after drying, and it is unknown whether they are nanoscale
Third, the article does not specify the surfactant used, and the particles are only lipophilic nano-silica particles, which are highly dependent on the properties of the particles
Fifth, in this literature, only the lipophilic nano-silica modified by tertiary amine surfactants has the ability of acid contact and alkali contact, and has reversibility, while the lipophilic nanoparticles modified by primary amine products DUW-1 Although the initial water-in-oil emulsion can be prepared, but after the acid-catalyzed phase inversion is an oil-in-water emulsion, the effective alkali-catalyzed phase inversion is a water-in-oil emulsion, that is, it is not reversible

Method used

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  • Reversible Pickering emulsion, its preparation method and reversible high-temperature high-density drilling fluid
  • Reversible Pickering emulsion, its preparation method and reversible high-temperature high-density drilling fluid
  • Reversible Pickering emulsion, its preparation method and reversible high-temperature high-density drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0145] Step 1, in situ activation.

[0146] Take 100 parts by mass of 0# diesel oil as the oil phase, add 2 parts by mass of lipophilic nano-silica particles as nanoparticles, and use balls with a diameter of 5mm, 10mm or 20mm to mill in a polyethylene ball mill tank for 10~ Mix well for 20 minutes, then add 0.2 parts by mass of surfactant n-pentylamine, continue ball milling for 5-24 hours, stop until the gel strength is 1-2g / cm2, complete the in-situ activation of nanoparticles, and obtain weak gel state oil phase suspension.

[0147] Step two, emulsification.

[0148] Take the weak gel state oil phase suspension in step 1, slowly add 125 parts by mass of deionized water as the water phase, emulsify with a homogenizer, the diameter of the metal vibrating rod of the homogenizer is 10mm-50mm, and the length of the metal vibrating rod is 100mm ~450mm, the frequency is 10000~13500r / min, and the emulsification time is 5min~4h. After the emulsification is completed, cool down to...

Embodiment 8

[0153] Step one, in situ activation.

[0154] Take 60 parts by mass of 0# diesel oil as the oil phase, then add 0.2 parts by mass of surfactant diethylenetriamine, stir and mix by magnetic force, use a rotor with a diameter of 1 cm to 10 cm, and the power of the magnetic stirrer is 100W to 300W, and stir for 10 to 30min, then add 4 parts by mass of lipophilic nano-silica particles as nanoparticles, continue magnetic stirring for 12-24h, stop until the gel strength is 1-2g / cm2, complete the in-situ activation of nanoparticles, and obtain weak Gel-state oil phase suspension.

[0155] Step two, emulsification.

[0156] Take the weak gel state oil phase suspension in step 1, slowly add 40 parts by mass of deionized water as the water phase, stir and emulsify with a high-speed stirrer, the stirring speed is 8000-12000r / min, the emulsification time is 10-20min, emulsification After completion, the ice bath was cooled to room temperature to obtain a reversible Pickering emulsion. ...

Embodiment 9

[0158] Take 80 parts by mass of gas oil as the oil phase, add 2 parts by mass of lipophilic nano-magnesium dioxide particles as nanoparticles, use an ultrasonic cell crushing / vibration instrument, the diameter of the vibration head is 3mm, the working frequency is 20KHz / 10W, ultrasonic Disperse for 10-30 minutes, mix well, then add 0.4 parts by mass of amine-based surfactant N—(2-hydroxyethyl)ethylenediamine, continue ultrasonic dispersion for 12-24 hours, stop until the gel strength is 1-2 g / cm, The in-situ activation of the nanoparticles is completed to obtain a weakly gelled oil phase suspension.

[0159] Step two, emulsification.

[0160] Take the weak gel state oil phase suspension in step 1, slowly add 20 parts by mass of 0.5g / mL calcium chloride aqueous solution as the water phase emulsification, use an ultrasonic cell breaker / vibrator, the diameter of the vibration head is 3mm, and the working frequency is 20KHz / 10W , the emulsification time is 10-30min. After the emu...

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Abstract

The invention provides a reversible Pickering emulsion, and the reversible Pickering emulsion comprises an oil phase, an aqueous phase and a nanoparticle activated in situ by an amine surfactant or anamine derivative surfactant. The nanoparticle is a lipophilic, hydrophilic or amphiphilic nano oxide, and the amine surfactant is primary amine, secondary amine, tertiary amine surfactants or derivatives of the surfactants. The lipophilic nanoparticle is activated in situ by a short chain amine surfactant or a short chain amine derivative surfactant; the hydrophilic or amphiphilic nanoparticle isactivated in situ by a long chain amine surfactant or a long chain amine derivative surfactant. The invention further provides a drilling fluid comprising the emulsion. An enhancer for the drilling fluid is an amphiphilic hyperbranched polymer, the density of the prepared reversible high-temperature high-density drilling fluid is directly adjusted within 1.6g / cm<3> to 2.2g / cm<3>, and has the relatively excellent properties of rheological property, suspension stability, filter cake clearance, filter loss control, environmentally friendliness, and reversibility of a water-in-oil emulsion and anoil-in-water emulsion.

Description

technical field [0001] The invention belongs to the technical field of drilling fluid, and in particular relates to a reversible Pickering emulsion, a preparation method thereof and a reversible high-temperature and high-density drilling fluid. Background technique [0002] Reversible drilling fluid technology refers to the reversible phase transition of water-in-oil drilling fluid and oil-in-water drilling fluid under the action of external stimuli, which has both the advantages of oil-based drilling fluid and water-based drilling fluid, and realizes oil-based drilling Liquid recycling. It is intended to be used for drilling complex formations such as high-temperature deep wells and ultra-deep wells, deep-sea drilling, and unconventional oil and gas wells. Reversible drilling fluid technology is a new type of drilling fluid technology with great development prospects. It is mainly used to solve the difficulties in filter cake removal, poor cementing quality, difficult and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C09K8/28C09K8/36
CPCC09K8/032C09K8/035C09K8/265C09K8/28C09K8/36C09K2208/10
Inventor 刘鹭蒲晓林李方王贵任妍君
Owner SOUTHWEST PETROLEUM UNIV
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