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Reversible crosslinking low-damage fracturing fluid thickening agent and production method thereof

A technology of thickening agent and fracturing fluid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., and can solve problems such as poor shear resistance, poor high temperature stability, and system instability

Inactive Publication Date: 2014-03-26
梁辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Guar gums are intolerant of residues, which are seriously clogged by adsorption, cannot be flowed back as soon as possible after the gel breaks and seriously damage the formation, have poor high temperature stability, poor shear resistance, and limited supply of raw materials
The problems of VES clean fracturing fluid are high cost, unstable system, and weak suspension ability: low viscosity and weak structure lead to low suspension ability and easy formation of sand plugging
Acrylamide polymers have poor resistance to temperature and shear, and are hydrolyzed and broken under high temperature conditions, losing the functions of fracturing for thickening, sand carrying, and fracture creation

Method used

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  • Reversible crosslinking low-damage fracturing fluid thickening agent and production method thereof
  • Reversible crosslinking low-damage fracturing fluid thickening agent and production method thereof
  • Reversible crosslinking low-damage fracturing fluid thickening agent and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The weight percent of each monomer and water: AM:NaAA:C 14 DMAAC::H 2 O=15:5:0.7:79.3.

[0031] Preparation of the solution: Add 79.3g of distilled water to a 500mL beaker, add 15g of monomer A, add 5g of monomer B, add 0.7g of monomer C, adjust the pH to 7.5 with sodium hydroxide, blow in nitrogen, and stir for 30 minutes to dissolve , Adjust the temperature to 10±1°C.

[0032] Polymerization of the solution: In the above state, add the initiator ammonium persulfate, sodium bisulfite, and azobisisobutyronitrile totaling 0.8g, stop blowing nitrogen 30 minutes after initiation and seal the polymerization kettle, and put it in a heat-preserving and airtight condition at 45 degrees down until the end of heating.

[0033] Post-processing of the product: granulate the polymerized colloid, dry it, crush it into 20-40 mesh, and code it as G-1 for testing.

Embodiment 2

[0035] The weight percent of each monomer and water: AM:NaAA:C 12 DMAAC:H 2 O H 2 O=10:6:0.5:83.5.

[0036] Preparation of the solution: Add 83.5g of distilled water to a 500mL beaker, add 10g of AM monomer, add 6g of NaAA monomer, add C 12 0.5g of DMAAC monomer, adjust the pH to 8.5 with sodium bicarbonate, blow in nitrogen gas, stir and dissolve for 30 minutes, and adjust the temperature to 10±1°C.

[0037] Polymerization of the solution: In the above state, add the initiator ammonium persulfate, sodium bisulfite, and azobisisobutyronitrile totaling 1g, stop blowing nitrogen 30 minutes after initiation and seal the polymerization kettle, and put it under the condition of heat preservation and airtightness at 45 degrees until the end of heating.

[0038] Post-processing of the product: granulate the polymerized colloid, dry it, and crush it into 20-40 mesh, numbered G-2, waiting for inspection.

Embodiment 3

[0040] The weight percent of each monomer and water: AM:NaAA:C 12 DMAAC:H 2 O=25:6:1:68.

[0041] Solution preparation: Add 68g of distilled water into a 500mL beaker, add 25g of AMA monomer, add 6g of NaAA monomer, add C 12 DMAAC monomer 1g, adjust the pH to 7.5 with sodium bicarbonate, blow in nitrogen gas, stir and dissolve for 30 minutes, and adjust the temperature to 10±1°C.

[0042] Polymerization of the solution: In the above state, add the initiator ammonium persulfate, sodium bisulfite, and azobisisobutyronitrile totaling 1.5g, stop blowing nitrogen 30 minutes after initiation and seal the polymerization kettle, and put it in a heat-preserving and airtight condition at 45 degrees down until the end of heating.

[0043] Post-processing of the product: granulate the polymerized colloid, dry it, crush it into 20-40 mesh, and code it as G-3 for testing.

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Abstract

The invention provides a strong sand-carrying fluid thickening agent which has a reversible crosslinking structure and is applied to water-base fracturing. The thickening agent has the advantages of one-high and two-low functional viscosity, easiness in breaking gel and returning, high salt resistance, high temperature resistance, low damage, no residue and the like. The invention also aims to provide a method for producing the thickening agent. The thickening agent is made by copolymerizing acrylamide (AM), sodium acrylate (NaAA) and allyl dodecyl dimethyl ammonium chloride (C(12-19)DMAAC) serving as a functional monomer, wherein the dodecyl-nonadecyl dially dimethyl ammonium serving as the functional monomer can be allyl dodecyl dimethyl ammonium chloride, tetradecyl dimethyl allyl ammonium chloride, hexadecyl dimethyl allyl ammonium chloride, octadecyl dimethyl allyl ammonium chloride or nonadecyl dimethyl allyl ammonium chloride.

Description

technical field [0001] The invention relates to a thickener for water-based fracturing fluid, especially a strong sand-carrying fluid with a reversible cross-linking structure and low damage, easy to break glue and flow back, resistant to salt and high temperature, low damage, clean and environmentally friendly Polymer thickener, and the production method of said thickener. Background technique [0002] How to efficiently increase the production of oil and gas wells has become the focus of scientific research. Fracturing fluid is the core technology for efficient production stimulation of oil and gas fields. The fracturing fluid used in fracturing must have high viscosity, high shear resistance, and strong sand-carrying properties. And the environmental protection characteristics of breaking glue and leaving no residue. High sand-carrying capacity for fracture creation. Only high sand-carrying ability can make the fracture reach the required width and depth. The reversible ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C08F220/56C08F220/06C08F226/04C08F4/40
CPCC09K8/68C08F220/56C09K8/882
Inventor 梁辉
Owner 梁辉
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