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Degradable temporary plugging ball suitable for underground fracturing operation and preparation method thereof

A temporary plugging ball and fracturing technology, applied in the field of degradable temporary plugging balls and their preparation, can solve the problems of secondary pollution of underground reservoirs, difficulty in dissolving, and difficulty in forming pressure-bearing strength, and achieve lasting and stable sealing and pressure-bearing function, good mechanical strength and toughness, and the effect of improving pressure stability

Active Publication Date: 2021-12-10
内蒙古浦景聚合材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in downhole fracturing operations in oil and gas fields, temporary plugging balls are usually used, and the existing temporary plugging balls are generally made of rubber, non-degradable plastics, alloys and other materials, but rubber or non-degradable plastics In actual application, the temporary plugging balls are often difficult to dissolve and easily get stuck in the blast hole, and it is difficult to return to the wellbore after the temporary plugging and fracturing construction is completed. Therefore, measures must be taken to drill or salvage them. Not only will it greatly increase operating costs and reduce production efficiency, but more liquid is usually used in the drilling and grinding process, which is likely to cause secondary pollution to underground reservoirs
In addition, although the temporary plugging ball made of alloy (for example, magnesium alloy) has high rigidity and high strength, it is selective to the dissolution environment and needs to be dissolved at a high ion concentration, and there will be residue after dissolution. It is easy to cause pollution to the underground reservoir; when encountering the irregular shape of the blasthole, due to the high rigidity of the alloy material, it is difficult to produce deformation suitable for the irregular shape of the blasthole, so that its sealing performance to the blasthole is poor, and it is difficult to form Stable bearing strength, which in turn affects the effect of temporary plugging and steering fracturing

Method used

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  • Degradable temporary plugging ball suitable for underground fracturing operation and preparation method thereof
  • Degradable temporary plugging ball suitable for underground fracturing operation and preparation method thereof
  • Degradable temporary plugging ball suitable for underground fracturing operation and preparation method thereof

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Experimental program
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Embodiment approach

[0070] As an embodiment, the antioxidant is selected from the group consisting of β-(3,5 di-tert-butyl-4-hydroxyphenyl) octadecyl propionate, 1,1,3 tris(2-methyl-4 Hydroxy-5-tert-butylphenyl)butane, 2,2'-methylenebis(4-ethyl-6-tert-butylphenol), 1,3,5-tris(3,5-tert-butyl-4- At least one of hydroxybenzyl)trimethylbenzene, 2,2'-methylenebis(4-methyl-6-tert-butylphenol) or 4,4'-di-tert-octyldiphenylamine.

[0071] As an embodiment, the heat stabilizer is an organic tin heat stabilizer, preferably dibutyltin maleate, dibutyltin dilaurate, dibutyltin laurate maleate, di-n-octyltin maleate, dilauric acid at least one of di-n-octyltin di-n-octyltin or bis(isooctylthioglycolate) di-n-octyltin.

[0072] As an embodiment, the anti-hydrolysis agent is bis(2,6-diisopropylphenyl)carbodiimide.

[0073] The preparation method of the degradable temporary blocking ball is as follows:

[0074] Step 1) Preparation of molten polyglycolic acid:

[0075] Step 1-1) Import the purified glycolide ...

Embodiment 1

[0104] The formulation components are detailed in the table below.

[0105] The modified zeolite used is prepared by the following method:

[0106] Step i): Add zeolite powder to NaOH solution with a concentration of 10wt%, stir in a water bath at 50°C for 60 minutes, and then separate the solid from the liquid to keep the solid, wash it with deionized water until it is neutral, and place it at 80°C ℃ drying in an oven for 8 hours to obtain pretreated zeolite powder;

[0107] Step ii): adding the pretreated zeolite powder to an ethanol solution containing γ-aminopropyltrimethoxysilane and 3-(2,3-epoxypropoxy)propylmethyldimethoxysilane (from anhydrous Mix ethanol and deionized water at a mass ratio of 1:5), stir in a water bath at 80°C for 2 hours to obtain a suspension, then transfer the suspension to an ultrasonic disperser, and use 400W ultrasonic at 35°C Treat for 2 hours, then centrifuge to retain the solid, wash with absolute ethanol several times, dry in an oven at 80...

Embodiment 2

[0110] The formulation components are detailed in the table below.

[0111] The modified zeolite used is prepared by the following method:

[0112] Step i): Add zeolite powder to NaOH solution with a concentration of 25wt%, stir in a water bath at 60°C for 20 minutes, centrifuge, keep the solid, wash with deionized water until neutral, and place at 80°C dried in a dry oven for 8 hours to obtain pretreated zeolite powder;

[0113] Step ii): adding the pretreated zeolite powder to an ethanol solution containing γ-aminopropyltrimethoxysilane and 3-(2,3-epoxypropoxy)propylmethyldimethoxysilane (from anhydrous Mix ethanol and deionized water at a mass ratio of 1:1), stir in a water bath at 90°C for 1 hour to obtain a suspension, then transfer the suspension to an ultrasonic disperser, and use a 600W ultrasonic wave at 60°C Treat for 1 hour, then centrifuge to retain the solid, wash with absolute ethanol for several times, dry in an oven at 100°C for 10 hours, and grind until 95% ...

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Abstract

The invention relates to a degradable temporary plugging ball suitable for underground fracturing operation. The degradable temporary plugging ball comprises the following raw material components in parts by weight: 70-90 parts of polyglycolic acid, 10-30 parts of a flexible degradable resin, 4-8 parts of a compatilizer, 2-5 parts of a plasticizer, 0.5-2 parts of a chain extender, 15-30 parts of a functional filler, 0.2-1.6 parts of an antioxidant, 2-4 parts of a heat stabilizer and 0.1-1 part of an anti-hydrolysis agent. Compared with the prior art, the polyglycolic acid and the flexible degradable resin are compounded, and the functional filler is supplemented, so that the material system has relatively high mechanical strength and certain flexibility, the heat-resistant stability of the material system can be effectively improved, and the prepared temporary plugging ball can still keep relatively stable plugging and pressure-bearing effects under a high-temperature condition, and has good degradability.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well exploitation, and in particular relates to a degradable temporary plugging ball suitable for downhole fracturing operations and a preparation method thereof. Background technique [0002] In recent years, with the continuous exploitation of oil and gas fields, the quality of reservoirs will decline year by year. For this reason, relevant oil and gas producers often use reservoir fracturing to improve the permeability of underground reservoirs, so as to continue to effectively extract from these underground reservoirs. Exploitation of oil and gas resources in the reservoir. At present, in downhole fracturing operations in oil and gas fields, temporary plugging balls are usually used, and the existing temporary plugging balls are generally made of rubber, non-degradable plastics, alloys and other materials, but rubber or non-degradable plastics In actual application, the temporary plugging...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/68C09K8/88C08G63/08C08G63/78C01B39/02B29D99/00B29B9/06
CPCC09K8/512C09K8/5086C09K8/685C09K8/887C09K8/885C08G63/08C08G63/78C01B39/026B29D99/0042B29B9/06
Inventor 黄维捷谭磊纪海霞
Owner 内蒙古浦景聚合材料科技有限公司
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