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Supramolecular self-assembly clean fracturing fluid and preparation method thereof

A supramolecular self-assembly and cleaning fracturing fluid technology, applied in chemical instruments and methods, drilling compositions, bulk chemical production, etc., can solve problems such as formation permeability damage and impact on fracturing effects

Active Publication Date: 2021-11-02
SHANDONG GUANGHE FINE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Hydraulic fracturing is one of the important measures to increase oil and gas production. Commonly used water-based fracturing fluids include guanidine gel cross-linking system and acrylamide derivative polymer cross-linking system. After the cross-linked fracturing fluid system breaks, there is a certain residue , the residue has a certain damage to the formation permeability and affects the fracturing effect

Method used

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  • Supramolecular self-assembly clean fracturing fluid and preparation method thereof
  • Supramolecular self-assembly clean fracturing fluid and preparation method thereof
  • Supramolecular self-assembly clean fracturing fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] step 1)

[0039] In the three-necked flask with adjustable reflux fractionation column, add 87g (1mol) of MMA and 96g (0.4mol) of N-methyl, N-hydroxyethyl dodecylamine, then add 8g of p-toluenesulfonic acid and 0.2 g phenothiazine. The reaction was stirred and heated to reflux, the product methanol was separated from the top of the column, and MMA was refluxed into the reaction bottle. React for 3.5 hours, rectify and separate excess MMA, and then distill under reduced pressure to obtain product intermediate 1-1, N-fatty amine, N-methyl, N-ethyl acrylate

[0040] Step 2)

[0041] Add 28.3g of intermediate 1-1 (C12, 0.1mol) to the flask, add 75mL of isopropanol, add 40g (0.1mol) of 30% sodium chloroacetate aqueous solution dropwise in a water bath at 45°C, and control the reaction temperature not higher than 60 °C, after the addition is completed, slowly heat in a water bath to raise the temperature to 80-90 °C for 2 hours. After the reaction is completed, cool, filte...

Embodiment 2

[0049] step 1)

[0050] In the three-necked flask with adjustable reflux fractionation column, add 87g (1mol) of MMA and 107g (0.4mol) of N-methyl, N-hydroxyethyl tetradecylamine, then add 8g of p-toluenesulfonic acid and 0.2 gPhenothiazine. The reaction was stirred and heated to reflux, the product methanol was separated from the top of the column, and MMA was refluxed into the reaction bottle. React for 3.5 hours, rectify and separate excess MMA, and then distill under reduced pressure to obtain product intermediate 1-2.

[0051] Step 2)

[0052] Add 31.1g of intermediate (1-2) (C14, 0.1mol) to the flask, add 75mL of isopropanol, add 40g (0.1mol) of 30% sodium chloroacetate aqueous solution dropwise in a water bath at 45°C, and control the reaction temperature not to be high At 60°C, after the addition is completed, slowly heat in a water bath to raise the temperature to 80-90°C for 2 hours. After the reaction is completed, cool, filter out the salt, and evaporate the fil...

Embodiment 3

[0060] Take 9.9g of acrylamide, 5.4g of monomer 1-1, 20.7g of monomer 2-1, 7g of PVP, add 113g of water, stir to dissolve, add 44g of ammonium sulfate, blow nitrogen for 20 minutes under stirring, add 0.2g of V50 in a water bath at 50°C Initiator, polymerization reaction for 6 hours to obtain supramolecular self-assembled polymer emulsion 3.

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Abstract

The invention discloses a supramolecular self-assembly clean fracturing fluid and a preparation method thereof. The supramolecular self-assembly clean fracturing fluid comprises the following components in percentage by mass: 0.4-2.0% of a supramolecular self-assembly emulsion polymer and water, wherein the molecular structure of the supramolecular self-assembly emulsion polymer is shown in the description. Dication and amphoteric anions in the fracturing fluid structure have the function of forming a viscoelastic gel system by self-assembly winding in an aqueous solution, and the formed gel has high-temperature stability and salt resistance, can achieve the effects of temperature resistance, is degraded into a micromolecular surfactant without a cross-linking function after fracturing construction is finished, has discharge aiding performance, and realizes the characteristics of cleanness and no damage.

Description

technical field [0001] The invention relates to a supramolecular self-assembly clean fracturing fluid and a preparation method thereof, belonging to the technical fields of fine chemicals, oil and gas field development, and environmental protection. Background technique [0002] Hydraulic fracturing is one of the important measures to increase oil and gas production. Commonly used water-based fracturing fluids include guanidine cross-linking system and acrylamide derivative polymer cross-linking system. There are certain residues after the cross-linked fracturing fluid system is broken. , the residue has a certain damage to the formation permeability and affects the fracturing effect. With the development of science and technology, different clean fracturing fluids have been developed. (1) CN104694114A discloses a supramolecular polypolymer clean fracturing fluid, which is mainly composed of amphoteric surfactants, anionic polymers containing hydrophobic groups, and anionic ...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/34C09K8/68C09K8/88
CPCC08F220/56C09K8/68C09K8/882C08F220/34Y02P20/54
Inventor 裴玉彬李大军苏帅田波滕学伟位建成
Owner SHANDONG GUANGHE FINE CHEM CO LTD
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