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Biodegradable salt-resistant thickening system as well as preparation method and application thereof

A biodegradable and systematic technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as temperature resistance, poor salt resistance, formation damage, difficult to handle flowback fluid, etc., to achieve convenient and flexible use Compounding, damage reduction effects

Active Publication Date: 2021-07-30
四川川庆井下科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has problems such as relatively high amount of thickener (generally greater than 5wt%), relatively poor temperature resistance and salt resistance, so it is relatively less used in oil and gas fields.
The polymer-based slick water and linear gel fracturing system has the advantages of simple preparation, convenient application, and low cost of use. It has been widely used in the fracturing process of oil and gas fields, but the polymers used are difficult to break the gel completely. , and the molecular weight of the residual polymer after gel breaking is still relatively large, which will cause formation damage, and the flowback fluid is difficult to deal with, which brings great difficulties to the follow-up treatment of oil and gas field fracturing construction
[0004] It can be seen that it is difficult for the existing thickened products to be friendly to the formation while ensuring good temperature resistance and salt resistance

Method used

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  • Biodegradable salt-resistant thickening system as well as preparation method and application thereof
  • Biodegradable salt-resistant thickening system as well as preparation method and application thereof
  • Biodegradable salt-resistant thickening system as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Prepare the biodegradable salt-tolerant thickening system of the present invention:

[0057] 1.1 Preparation of biodegradable salt-tolerant polymer

[0058] Accurately weigh acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and vinyl acetate with a molar ratio of 38:20:2:40 and dissolve them in a certain amount of deionized water. The mass concentration of the monomers is 30%, and then placed in a 250mL three-neck flask, stirring constantly to dissolve it. The three-neck flask was placed in a constant temperature water bath, and N 2 And stirred for 0.5 hours until the solution was clear. Inject the initiator azobisisobutyronitrile (AIBN) with a syringe, and the amount of the initiator is 0.1% of the total mass of the monomers. The temperature was raised to 43°C, and the N 2 Stir continuously, seal the three-necked flask and place it for 6 hours, and finally obtain a transparent gel-like product, take it out and cut it into small pieces, purify it w...

Embodiment 2

[0066] Prepare the biodegradable salt-tolerant thickening system of the present invention:

[0067] 2.1 Preparation of biodegradable salt-tolerant polymer

[0068] Accurately weigh acrylamide, acrylic acid, carboxybetaine methacrylic acid and acrylate with a molar ratio of 47:15:3:35, dissolve them in a certain amount of deionized water, the mass concentration of the monomers is 20%, and then place in 250mL In a three-necked flask, stir continuously to dissolve it. The three-neck flask was placed in a constant temperature water bath, and N 2 And stirred for 0.5 hours until the solution was clear, cooled to 5°C and stabilized. The initiator ammonium persulfate / sodium bisulfite mixture is injected with a syringe, and the amount of the initiator is 0.05% of the total mass of the monomers. Maintain the temperature at 5°C and continue to feed N 2 Stir continuously, seal the three-necked flask and place it for 7 hours, and finally obtain a transparent gel-like product, take it o...

Embodiment 3

[0076] Prepare the biodegradable salt-tolerant thickening system of the present invention:

[0077] 3.1 Preparation of biodegradable salt-tolerant polymer

[0078] Accurately weigh acrylamide, acrylic acid, carboxybetaine methacrylic acid and maleic anhydride with a molar ratio of 63:10:2:25, dissolve them in a certain amount of deionized water, the mass concentration of the monomers is 40%, and then place In a 250mL three-neck flask, stir continuously to dissolve it. The three-neck flask was placed in a constant temperature water bath, and N 2 And stirred for 0.5 hours until the solution was clear, cooled to 10°C and stabilized. The initiator is the ammonium persulfate / sodium bisulfite mixed solution injected with a syringe, and the amount of the initiator is 0.07% of the total mass of the monomer. Maintain the temperature at 5°C and continue to feed N 2 Stir continuously, seal the three-neck flask and place it for 5 hours, and finally obtain a transparent gel-like produc...

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Abstract

The invention discloses a biodegradable salt-resistant thickening system and a preparation method and application thereof. A biodegradable polyacrylamide-based polymer is used in the thickening system, the biodegradable polyacrylamide-based polymer comprises a first monomer unit and a second monomer unit, wherein the first monomer is selected from one or more of acrylamide and amino-substituted acrylamide, and the second monomer is selected from one or more of maleic anhydride, vinyl acetate, epsilon-caprolactone, acrylic ester, vinyl acetoacetate, p-vinylaniline and acrylic acid. Compared with an existing fracturing system, the thickening system has good salt tolerance when applied to the fracturing system; the biodegradability is good, and the damage to the surrounding environment and the stratum permeability can be reduced; the viscosity can be formed in a short time during on-site preparation, the operation is simple, and the use is convenient; and flexible preparation of slick water and a linear glue solution can be realized by controlling the dosage, and the advantages of one agent with multiple purposes are achieved.

Description

technical field [0001] The invention relates to the field of acidizing fracturing agents, in particular to a biodegradable salt-tolerant thickening system and its preparation method and application. Background technique [0002] The application of hydraulic fracturing technology in oil fields began in the 1940s. After nearly 70 years of development, it has gradually become one of the important production stimulation measures to improve oil and gas well productivity and oil reservoir recovery. Especially in recent years, low-permeability reservoirs are faced with the situation of "low oil recovery rate, low recovery rate, low reserve production rate, and difficulty in energy replenishment". As the main technical means to improve the productivity of low-permeability reservoirs, hydraulic fracturing more attention. With the prolongation of oil and gas exploration and development, conventional oil and gas production continues to decline, and low-permeability and ultra-low-perme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F218/08C08F220/56C08F220/06C08F220/58C08F220/36C09K8/68C09K8/88
CPCC08F218/08C08F220/56C09K8/68C09K8/885C08F220/06C08F220/585C08F220/365C08F220/10
Inventor 王鹏祥李嘉孙亚东张晓虎吴越于世虎张祥枫陈星宇代清周怡
Owner 四川川庆井下科技有限公司
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