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Multifunctional synergist for acidizing and fracturing as well as preparation method thereof

An acid fracturing, multi-functional technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as far poor comprehensive performance of liquids, and achieve the effects of low cost, improved overall performance, and reduced damage

Active Publication Date: 2014-03-26
四川省博仁达石油科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although most of the additives in the fracturing fluid and acid fluid system have relatively good single performance, due to the interference or synergistic effect between the performance of each single agent, such as drainage aiding effect, bactericidal effect, anti-swelling effect, etc., the overall performance of the liquid is lower. Far worse than the single agent performance of each additive

Method used

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  • Multifunctional synergist for acidizing and fracturing as well as preparation method thereof
  • Multifunctional synergist for acidizing and fracturing as well as preparation method thereof
  • Multifunctional synergist for acidizing and fracturing as well as preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: A multifunctional synergist for acidification fracturing, which is composed of the following raw materials in parts by weight: functional polymer compound: 30, fluorocarbon surfactant: 2, alkyl betaine: 6, iso Propanol: 37, water: 28.

[0022] The preparation method of the above-mentioned multifunctional synergist for acidizing fracturing, it comprises the following steps:

[0023] S1. Preparation of functional polymer compounds:

[0024] S11. Formation of secondary amine intermediate: Dilute secondary amine ethyleneimine with water, lower the solution temperature to 5°C, add 0.08% solution weight of dibenzoyl peroxide, and then add diethylamine dropwise. Keep the solution temperature at 10°C, heat the solution to 38°C and react for 4.8 hours after dropping, and generate a secondary amine intermediate; wherein, the weight ratio of ethyleneimine, water, and diethylamine is 1:2.6:1, so Described secondary amine is synthesized by dimethylamine and diethylam...

Embodiment 2

[0029] Embodiment 2: A multifunctional synergist for acidification fracturing, which is composed of the following raw materials in parts by weight: functional polymer compound: 50, silicon surfactant: 5, foaming agent: 10, solvent: 7 , water: 59.

[0030] The foaming agent is an alkyl glycoside surfactant and an alkyl diphenyl ether disulfonate, and the weight ratio is 3:1; the solvent is ethylene glycol and ethanol, and the weight ratio is 1:1.8.

[0031] The preparation method of the above-mentioned multifunctional synergist for acidizing fracturing, it comprises the following steps:

[0032] S1. Preparation of functional polymer compounds:

[0033] S11. Generation of secondary amine intermediate: Dilute ethyleneimine with water, lower the solution temperature to 10°C, add 0.12% solution weight catalyst, then drop dimethylamine, keep the solution temperature at 5°C during the dropwise addition, After the dropwise addition, the solution was heated to 42°C for 5.2 hours to g...

Embodiment 3

[0038] Embodiment 3: A multifunctional synergist for acidification fracturing, which is composed of the following raw materials in parts by weight: functional polymer compound: 38, special surfactant: 3, foaming agent: 7, solvent: 5 , water: 35.

[0039] The special surfactant is a fluorocarbon surfactant and a silicon surfactant, and the weight ratio is 5:2; the foaming agent is an alkyl betaine, an alkyl glycoside surfactant and an alkyl diphenyl ether diphenyl ether. Sulfonate, and the weight ratio is 1:3:1.5; the solvent is isopropanol, ethylene glycol and ethanol, and the weight ratio is 4:1.8:3.

[0040] The preparation method of the above-mentioned multifunctional synergist for acidizing fracturing, it comprises the following steps:

[0041] S1. Preparation of functional polymer compounds:

[0042]S11. Formation of secondary amine intermediate: Dilute ethyleneimine with water, lower the solution temperature to 7°C, add 0.1% solution weight catalyst, then drop diethyla...

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Abstract

The invention discloses a multifunctional synergist for acidizing and fracturing. The multifunctional synergist comprises raw materials in pars by weight as follows: 30-50 parts of a functional macromolecular compound, 2-5 parts of a special surfactant, 6-10 parts of a foaming agent, 3-7 parts of a solvent and 28-59 parts of water. A preparation method of the multifunctional synergist for acidizing and fracturing comprises the steps of preparation of the functional macromolecular compound, weighing and mixing. According to the multifunctional synergist for acidizing and fracturing, the performance of additives in acid liquor and fracturing fluid is regulated, so that the compatibility of the additives is strengthened, the fracturing liquid is better in rheological property, wettability and gel-breaking residue form, and the damage of the fracturing liquid is reduced; the synergist has good functions of sterilization, discharge assistance, foaming and clay swelling prevention; the preparation method for the multifunctional synergist for acidizing and fracturing has the advantages of simplicity in preparation, convenience in preparation, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and in particular relates to a multifunctional synergist used in the acidizing and fracturing process of oil wells and a preparation method thereof. Background technique [0002] Low-permeability tight oil and gas reservoirs have become the main body of oil and gas development in my country. Typical tight sandstone oil and gas reservoirs have the characteristics of low pore permeability, low oil and gas saturation, high clay content, high water saturation, poor pore throat configuration, and small radius. With the deterioration of the physical properties of the reservoir, the fracturing fluid entering the formation can easily cause damage to the reservoir permeability, blockage of the fracture wall, and damage to the fracturing fluid residue in the fracture, resulting in a decrease in conductivity; while for low-permeability tight gas reservoirs , when the fracturing fluid flowback is no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
CPCC09K8/602C09K8/725C09K8/74C09K2208/12
Inventor 张绍彬康毅杨延波唐朝均
Owner 四川省博仁达石油科技有限公司
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