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Ultralow-density proppant and preparation method thereof

A technology of ultra-low density and proppant, which is applied in chemical instruments and methods, earthwork drilling, mining fluid, etc. It can solve the problems of low density of narrow branch joints and poor proppant laying effect, etc., and achieve easy heat transfer And control, improve filling efficiency, improve the effect of length

Active Publication Date: 2021-05-04
北京贝斯特佳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the density of quartz sand and ceramsite is relatively high, and the proppant laying effect is poor in the hydraulic fracturing process of conventional reservoirs; while the film-coated proppant has good adaptability in conventional reservoirs, However, in the fracturing process of unconventional reservoirs such as shale gas and coalbed methane, it cannot meet the low density requirements of narrow branch fractures.

Method used

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  • Ultralow-density proppant and preparation method thereof
  • Ultralow-density proppant and preparation method thereof
  • Ultralow-density proppant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052]S11, 130 kg of water is placed in a 500l synthetic kettle, warmed and constant to 80 ° C, under stirring conditions, sequentially add 15 kg of magnesium magnesium sulfate solution and 15 kg of sodium carbonate solution, and mix it, wherein the concentration of magnesium sulfate solution In 11%, the concentration of the sodium carbonate solution was 10%;

[0053]S12, 0.016 kg of styrene-maleic anhydride copolymer is sequentially added to the solution obtained in step S11 and 0.028 kg2,6-di-tert-butyl-4-methylphenol, mixed with mixed liquid phase after mixing;

[0054]S13, add density to the liquid phase to 0.4 kg / m30.96kg of hollow glass microbeads having a diameter of 0.31 mm;

[0055]S14, under stirring conditions, 32.00 kg of monomers (30.72 kg of styrene, 1.28 kg of divinylbenzene) were continued to step S13, while filled with nitrogen in the solution, after the air in the oil, close The synthetic kettle valve continues to be charged into the synthetic kettle to cause 0.6 MPa in t...

Embodiment 2

[0059]In Example 2 S21, S22, S25 were the same as in Example 1;

[0060]Among them, S23 is added to the liquid phase to 0.45 kg / m.3Hollow glass microbead 1.18kg in diameter is 0.31mm;

[0061]S24, under stirring conditions, 32.00 kg of styrene (29.44 kg of styrene, 2.56 kg of divinylbenzene) was continued to step S23, while filled with nitrogen in the solution, after the air in the oil, close The synthetic kettle valve continues to be charged into the synthetic kettle to cause 0.6 MPa in the synthetic kettle to obtain reaction liquid;

[0062]S26, sequentially separate, washing, dehydration, drying, and sieving the polymer product mixture, resulting in a medium intensity proppant 20 / 30 / m.

Embodiment 3

[0064]In Example 3 S31, S32, S35 were the same as in Example 1;

[0065]Where S33, the density is 0.5 kg / m into the liquid phase.3Hollow glass microbead 1.13kg in diameter is 0.3mm;

[0066]S34, under stirring conditions, 32.00 kg of monomer (26.88 kg of styrene, 5.12 kg of dizene) obtained in step S33, while filled with nitrogen in the solution, after the air in the kettle, close The synthetic kettle valve continues to be charged into the synthetic kettle to cause 0.6 MPa in the synthetic kettle to obtain reaction liquid;

[0067]S36, sequentially separate, washing, dehydration, drying, and sieved, resulting in high strength proppants 20 / 30 / h.

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Abstract

The invention relates to the technical field of oilfield development, in particular to an ultralow-density proppant and a preparation method thereof. The preparation method comprises the following steps that in a low-pressure reaction kettle, a dispersing agent and an antioxidant are evenly mixed with water, and a liquid phase is obtained; sequentially adding a core material and a monomer into the liquid phase under a stirring condition to obtain a reaction solution; raising the temperature of the reaction liquid and keeping constant temperature for suspension polymerization reaction to obtain the proppant; the core material is a hollow glass bead, and the monomer is an olefin compound. Compared with the preparation process of the film-coated proppant in the prior art, the preparation process of the proppant is simplified, the ultralow-density proppant with the specific gravity close to that of water is prepared, the proppant is suspended in fracturing fluid and can effectively support micro cracks at the front end of a crack, the filling efficiency of an artificial crack is improved, the yield increase of an oil well is further facilitated, especially in tight oil gas, after micro cracks are filled, the overall volume efficiency of oil reservoir fracturing can be greatly improved.

Description

Technical field[0001]The present invention relates to the field of oilfield development techniques, and more particularly to an ultra-low density proppant and a preparation method thereof.Background technique[0002]With the increasing routine energy of oil and natural gas, the unusual energy such as coalbed methane, shale gas is increasingly concerned, and the cost of fracturing, such as hydraulic fracturing is used to improve the development effect of underground energy.[0003]my country's low penetration, extensive osmotic oil and gas distribution is widely distributed, most low-permeable oil retainings do not have industrial oil and gas. Hydraulic fracturing technology is an important technique for low penetration, dermine gastrocus, shale oil, petroleum engineering, which is mainly to improve fluid from the formation to the flow capacity of the wellbore, and improve the oil and gas well productivity. Conventional fracturing techniques typically use a proppant to fill a crack, keep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/80
CPCC09K8/80
Inventor 石在虹
Owner 北京贝斯特佳科技有限公司
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