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A kind of effervescent air-suspension proppant for slick water fracturing and preparation method thereof

A technology for hydraulic fracturing and proppant, which is applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problems of reducing reservoir conductivity, falling off of proppant aggregate, and failure of suspension, etc. Achieve the effect of increasing collision and contact probability, reducing screenout, and increasing dosage

Active Publication Date: 2021-03-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the surface coating of this proppant swells with water, it is easy to fall off with the proppant aggregate, resulting in suspension failure. On the other hand, the polymer coating in the formation will cause damage to the formation and reduce the conductivity of the reservoir.

Method used

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  • A kind of effervescent air-suspension proppant for slick water fracturing and preparation method thereof
  • A kind of effervescent air-suspension proppant for slick water fracturing and preparation method thereof
  • A kind of effervescent air-suspension proppant for slick water fracturing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In order to overcome the problems of the prior art, this embodiment provides a figure 1 The shown effervescent air-suspension proppant for slick water fracturing includes aggregate particles 1, the outer layer of the aggregate particles 1 is provided with an inner coating 2 and an outer coating 3, and the inner coating 2 is located at Between the outer layer of aggregate particles 1 and the outer layer 3 .

[0047] Further, the aggregate particles are quartz sand or ceramsite, with a particle size ranging from 0.125 mm to 2.0 mm.

[0048] Preferably, the aggregate particles are selected from quartz sand for fracturing or ceramsite for fracturing after processes including water washing or pickling, and grading, and the particle size ranges from 0.212 mm to 0.85 mm.

[0049] Preferably, the inner coating 2 is a hydrophobic and air-philic coating, and the hydrophobic and air-philic coating is prepared by curing a hydrophobic and air-philic emulsion.

[0050] Preferably, th...

Embodiment 2

[0054] On the basis of Example 1, this example provides the effervescent air-suspension proppant for slick water fracturing. The effervescent agent includes the following components: by mass percentage, 20-40% alkaline agent, 10-20% acidic agent, 1-10% binder, and the balance is absolute ethanol.

[0055] Further, the alkaline agent is carbonate or bicarbonate.

[0056] Preferably, the alkaline agent is one or a mixture of several of ammonium bicarbonate, potassium carbonate, sodium carbonate, potassium bicarbonate, sodium bicarbonate, and ammonium carbonate in any proportion.

[0057] More preferably, the alkaline agent is sodium bicarbonate or sodium carbonate.

[0058] The acidic agent is organic acid, acid anhydride or acid salt.

[0059] Preferably, the acidic agent is one or a mixture of several of oxalic acid, citric acid, maleic acid, sorbic acid, malic acid, gluconic acid, tartaric acid, and adipic acid in any proportion.

[0060] More preferably, the binder is a p...

Embodiment 3

[0071] On the basis of Example 1, this example provides the effervescent air-suspension proppant for slick water fracturing. The hydrophobic and air-friendly emulsion includes the following components: by mass percentage, 20-50% contains Fluorine polymer monomer, 5-25% polymer binder, 3-10% silane coupling agent, 3-10% surfactant, the balance is deionized water

[0072] Further, the fluorine-containing polymerizable monomer is fluorine-containing acrylate.

[0073] Preferably, the fluorine-containing acrylate is hexafluorobutyl acrylate, hexafluorobutyl methacrylate, tridecafluorooctyl methacrylate, dodecafluoroheptyl acrylate, dodecafluoroheptyl methacrylate, methyl One of trifluoroethyl acrylate.

[0074] More preferably, the fluorine-containing acrylate is dodecafluoroheptyl methacrylate.

[0075] The polymer binder is one of lauryl methacrylate, octadecyl methacrylate, hydroxypropyl acrylate, hydroxyethyl acrylate, and 2-(dimethylamino)ethyl methacrylate or Several mixt...

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Abstract

The invention provides an effervescent gas suspension proppant for slickwater fracturing. The effervescent gas suspension proppant comprises aggregate particles, wherein an inner coating and an outercoating are arranged on the outer layer of each aggregate particle, and the inner coating is located between the outer layer of each aggregate particle and the outer coating. An outer effervescent membrane can be subjected to a reaction rapidly in slickwater, self-generating bubbles are generated, and the generated self-generating bubbles can be effectively adsorbed on the surface of an inner membrane of the proppant, namely, the surface of the hydrophobic and aerophilic membrane, so that buoyancy of the proppant in the slickwater is improved, the proppant suspend in slickwater freely, and thepurpose of carrying sand by common cross-linking liquid is achieved.

Description

technical field [0001] The invention relates to the technical field of slick water fracturing, in particular to an effervescent air suspension proppant for slick water fracturing and a preparation method thereof. Background technique [0002] Unconventional oil and gas reservoirs are currently a hot field of oil and gas exploration and development at home and abroad, and slickwater fracturing technology is one of the ideal ways for efficient and economical development of unconventional oil and gas reservoirs. Compared with crosslinking fluid, slick water has the advantages of low cost, low viscosity, easy formation of complex network fractures, less damage to reservoirs, and easy flowback; however, the low viscosity of slick water will also cause proppant to enter the reservoir The post-settling is faster, the maximum sand concentration is limited, and the distribution of proppant is uneven. At present, in view of the problem that slick water is not easy to carry sand, rese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/80C08F220/22C08F220/18
CPCC08F220/22C09K8/805C08F220/18
Inventor 王历历李宪文丁里石华强李小玲刘晓瑞孟磊祖凯马占国沈磊史华
Owner PETROCHINA CO LTD
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