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Intelligent encapsulation acid and use method

An intelligent package and intelligent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of uncontrollable acidification effect, limited effective distance of acid pressure, etc. Strong directional effect

Active Publication Date: 2021-03-12
四川省帕提科斯能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the acid liquid system reacts too quickly in the formation in the acidification, acid fracturing, plugging removal and other oil and gas stimulation processes of the current oil and gas reservoirs. , leading to problems such as limited effective distance of acid fracturing and uncontrollable acidification effect, a new type of intelligent encapsulated acid is provided, which encapsulates the liquid acid and releases the acid liquid after the encapsulated acid reaches the target reservoir position, realizing Controllable acid reaction, increasing the effective distance of acid

Method used

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  • Intelligent encapsulation acid and use method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] figure 1 is a schematic diagram of the microstructure of the encapsulated acid. It can be seen that the encapsulated acid of the present invention has a core-shell structure, the core of which is a conventional acid solution, and a shell layer is wrapped on the surface of the conventional acid solution. The conversion of acid solution from liquid continuous phase to solid dispersed phase is realized.

Embodiment 2

[0027] A preparation method of hydrophobic fluoropolymer:

[0028] (1) take by weighing 8g styrene and 12g N-allyl trifluoroacetamide, join in the reaction vessel;

[0029] (2) in reaction vessel, add 40g toluene, stir;

[0030] (3) Pour N into the liquid surface 2 Deoxygenation for 20min;

[0031] (4) in reaction vessel, add 0.4g azobisisobutyronitrile, stir to obtain mixed solution;

[0032] (5) The mixed solution was reacted at 60°C for 12h, the toluene was distilled off under reduced pressure while hot, and cooled to room temperature;

[0033] (6) pulverizing, ball-milling, and sieving the obtained copolymer, and selecting the powder of 10-500 nm, which is styrene-N-allyl trifluoroacetamide copolymer, and the molecular structural formula is as follows:

[0034]

[0035] The wettability is the key to determining whether the hydrophobic particles can successfully encapsulate the liquid acid solution. Therefore, the wettability of the fluoropolymer powder prepared in t...

Embodiment 3

[0042] A preparation method of hydrophobic fluoropolymer:

[0043] (1) take by weighing 10g benzyl methacrylate and 10g N-allyl trifluoroacetamide, join in the reaction vessel;

[0044] (2) in reaction vessel, add 10g xylene, stir;

[0045] (3) Pour N into the liquid surface 2 Deoxygenation for 20min;

[0046] (4) in reaction vessel, add 1.0g benzoyl peroxide, stir to obtain mixed solution;

[0047] (5) react the mixed solution at 100°C for 4h, distill off the toluene under reduced pressure while hot, and cool to room temperature;

[0048] (6) the obtained copolymer is pulverized, ball-milled, sieved, and the polymer powder of 10-500 nm is selected, and the molecular structure formula is as follows:

[0049]

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Abstract

The invention discloses an intelligent encapsulation acid and a use method thereof, wherein the encapsulation acid is composed of a core material and a shell material wrapping the core material, and the core material is a liquid acid; the liquid acid is an acidic liquid used in the oilfield exploitation process; the shell layer material is hydrophobic nanoparticles with the size of 10-500 nm, andthe nanoparticles are one or a combination of at least two of fumed silica, polystyrene, poly(benzyl methacrylate) and a fluorine-containing polymer. The encapsulation acid is used in an oil and gas production increasing process including acidification, acid fracturing and plug removal of an oil and gas reservoir, and when the encapsulation acid is used, after the encapsulation acid is carried toa target position of a stratum by adopting a carrying fluid, the encapsulation acid releases liquid acid to react with the stratum after encountering a release agent. In the invention, the liquid acidis converted into powder, so that corrosion to a container and a pipeline during acidification construction is avoided, the liquid acid is released after the powder acid reaches a target stratum; when the liquid acid reacts with the stratum, the effective acidification distance can be greatly increased.

Description

technical field [0001] The invention relates to the technical field of oil and gas stimulation and transformation, in particular to an intelligent encapsulated acid for improving acidification effect in the fields of acidification and acid fracturing and a method for using the same. Background technique [0002] In recent years, with the bottleneck of conventional oil and gas exploration and development and the rapid development of science and technology, unconventional oil and gas resources have gradually become a new growth replacement point for oil and gas resources. Globally, carbonate reservoirs are widely distributed and have great reserves potential. However, due to the strong heterogeneity of carbonate reservoirs, complex geological conditions, and low productivity. Under normal circumstances, it is necessary to stimulate the reservoir to achieve the purpose of understanding the reservoir and increasing the reserve and production, and the more mature acidification a...

Claims

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Application Information

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IPC IPC(8): C09K8/72C09K8/74
CPCC09K8/725C09K8/74C09K2208/10
Inventor 周利华李骏吴明移何思源张渝苹郭玉杰邹瑞萍刘平礼
Owner 四川省帕提科斯能源科技有限公司
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