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Delivery-controllable and release-controllable nanocapsule gel breaker as well as preparation method and application thereof

A technology of nanocapsules and gel breakers, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., and can solve the problems of capsule slow-release time not being too long, reducing raw material usage, loss, etc.

Active Publication Date: 2021-07-06
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited contact surface, only monomers in contact with persulfate can undergo polymerization to form long-chain polymers, and only a thin polymer shell can be formed on the surface of persulfate
Most monomers cannot participate in the reaction and are lost
At the same time, part of the persulfate will be consumed during free radical polymerization, which greatly reduces the utilization rate of raw materials
The study also found that the low-thickness poly(styrene-acrylamide) or polypyrrole shell grown on the surface will lead to incomplete encapsulation of persulfate, so that the sustained release time of the capsule cannot be too long, and currently it can only reach 8 hours at most.

Method used

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  • Delivery-controllable and release-controllable nanocapsule gel breaker as well as preparation method and application thereof
  • Delivery-controllable and release-controllable nanocapsule gel breaker as well as preparation method and application thereof
  • Delivery-controllable and release-controllable nanocapsule gel breaker as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] A method for preparing a delivery and release controllable nanocapsule breaker, comprising the steps of:

[0070] (1) Preparation of nanocapsule gel breaker by emulsion evaporation

[0071] 1) Add 0.1g of ammonium persulfate to 0.5ml of water to prepare an aqueous solution of ammonium persulfate (inner water core), and dissolve 1.1g of polyglycolide in 10ml of dichloromethane to obtain a hydrophobic polymer oil phase ;

[0072] 2) Add 0.5ml of gel breaker aqueous phase solution into 5ml of hydrophobic polymer oil phase, add 0.05ml of Brij72, and emulsify with a high-speed stirring paddle at a stirring speed of 12000rpm for 5min to obtain an intermediate emulsion;

[0073] 3) Add the intermediate emulsion to 10ml 1wt% polyvinyl alcohol (PVA) solution, carry out secondary emulsification, form a microemulsion, stir (350rpm) at 55°C for 8 hours, separate the nanocapsule breaker from the oil phase, and wash , dried, and then secondarily dispersed in water to obtain a 2wt.%...

Embodiment 2

[0079] A method for preparing a delivery and release controllable nanocapsule breaker, comprising the steps of:

[0080] (1) Preparation of nanocapsule gel breaker by emulsion evaporation

[0081] 1) Add 0.1g of ammonium persulfate to 0.5ml of water to obtain an aqueous solution of ammonium persulfate (inner water core), and dissolve 0.9g of polycaprolactone in 10ml of dichloromethane to obtain a hydrophobic polymer oil phase ;

[0082] 2) Add 0.5ml of gel breaker aqueous phase solution into 5ml of hydrophobic polymer oil phase, add Tergitol NP-40.05ml and Brij L-4 0.05ml, use high-speed stirring paddle for emulsification, stirring speed 12000rpm, stirring time 5min, get intermediate emulsion;

[0083] 3) Add the intermediate emulsion to 10ml 1wt% polyvinyl alcohol (PVA) solution, perform secondary emulsification to form a microemulsion, stir (350rpm) at 50°C for 8 hours, separate the nanocapsule breaker from the oil phase, and wash , dried, and then secondarily dispersed i...

Embodiment 3

[0087] A method for preparing a delivery and release controllable nanocapsule breaker, comprising the steps of:

[0088] (1) Preparation of nanocapsule gel breaker by emulsion evaporation

[0089] 1) Add 0.3g of pectinase to 0.6ml of water to prepare a pectinase aqueous phase solution (inner water core), add 0.6g of polymethyl methacrylate (PMMA) to dissolve in 10ml of dichloromethane to obtain a hydrophobic polymer oil phase;

[0090] 2) Add 0.5ml of gel breaker aqueous phase solution into 5ml of hydrophobic polymer oil phase, add 0.1ml of Brij72, and emulsify with a high-speed stirring paddle (12000rpm, 5min) to obtain an intermediate emulsion;

[0091] 3) Add the intermediate emulsion into 20ml of hexane solution for secondary emulsification to form a microemulsion, stir (300rpm) at 50°C for 8 hours to evaporate, separate the nanocapsule breaker from the oil phase, wash, dry, and then dissolve in water Secondary dispersion to obtain 2wt.% nanocapsule dispersion;

[0092]...

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Abstract

The invention relates to a delivery-controllableand release-controllable nanocapsule gel breaker and a preparation method and application thereof. The nanocapsule gel breaker is prepared by performing microemulsion evaporation on a hydrophobic polymer wall material, a gel breaker, dichloromethane, a non-solvent oil phase or an external water phase and a surface modification material and then performing surface modification. The nanocapsule gel breaker is small in size, and the particle size is 50-500 nanometers; after entering a storage layer, the nanocapsule gel breaker can enter a micro-nano crack along with a fracturing fluid and release the gel breaker to help a thickening agent in the fracturing fluid to break the gel, to assist the laying of a proppant and to remove polymer residues, so the flow conductivity of the micro-nano crack is improved; and the nanocapsule gel breaker can be delivered and accurately released in micro-and-nano-scale cracks and pore channels, so the gel breaking time of the thickening agent in the fracturing fluid is delayed, the laying effect of the proppant is improved, and the flow conductivity of the micro-nano crack is improved.

Description

technical field [0001] The invention relates to a nanocapsule gel breaker with controllable delivery and release, a preparation method and application thereof, and belongs to the technical field of petroleum exploitation. Background technique [0002] The economical and effective development of low-permeability and tight oil reservoirs is a long-term and important task. Hydraulic fracturing is an important reservoir stimulation measure to improve the production of low-permeability and tight oil and gas fields, and the fracturing fluid used in the construction must completely break the gel after the proppant is laid in order to achieve a good production stimulation effect. If the gel is not completely broken and remains in the fracture or rock matrix, on the one hand, it will cause secondary damage to the formation, and on the other hand, the formed filter cake will reduce the conductivity of the fracture. [0003] The most commonly used fracturing fluid system is acrylamide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/70
CPCC09K8/706C09K2208/26
Inventor 蒲景阳罗明良战永平贾晓涵杨玉玲黄一格刘同浩吴金博
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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