Low-temperature instant salt-resistant integrated water-based thickening agent for fracturing fluid and preparation method of thickening agent

A technology of thickening agent and fracturing fluid, which is applied in chemical instruments and methods, chemical industry, climate sustainability, etc. It can solve the problems of poor salt resistance, polluted formations, slow dissolution, etc., and achieves low cost and low formation pollution. Low, fast dissolution effect

Active Publication Date: 2021-12-03
陕西融森实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention overcomes the shortcomings of the emulsion type thickener solvent oil polluting the formation, poor salt resistance and slow dissolution, and realizes the characteristics of high performance, environmental protection and instant dissolution of the fracturing fluid

Method used

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  • Low-temperature instant salt-resistant integrated water-based thickening agent for fracturing fluid and preparation method of thickening agent
  • Low-temperature instant salt-resistant integrated water-based thickening agent for fracturing fluid and preparation method of thickening agent
  • Low-temperature instant salt-resistant integrated water-based thickening agent for fracturing fluid and preparation method of thickening agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of low-temperature instant salt-resistant integrated water-based thickener for fracturing fluid

[0033] (1) By adding an appropriate amount of distilled water, the total mass of the monomer is controlled at 17.5% AM, 7.5% AA, 3% ODAAC and 1% SMA hydrophobic functional monomer, 16% AMPS salt-tolerant monomer, 0.2% chelating agent EDTA , the total mass of the reaction system is 1000 g, and the solution is dissolved by magnetic stirring;

[0034] (2) Use 30% NaOH solution to adjust the pH of the system to 6.5;

[0035] (3) Lower the temperature in an ice-water bath, and when the system temperature drops to 2°C, add the monomer solution into a thermos;

[0036] (4) After passing the nitrogen for 40 minutes, add the initiator in an amount of 0.078% (calculated based on the total mass of the monomer) m((NH 4 ) 2 S 2 o 8 ):m(NaHSO 3 ):m(Vc):m(V 50 )=9:4:5:2, when the solution became viscous, the nitrogen flow was stopped, and after standing for 5 h, a white...

Embodiment 2

[0041] Preparation of low-temperature instant salt-resistant integrated water-based thickener for fracturing fluid

[0042] (1) By adding an appropriate amount of distilled water, the total mass of the monomer is controlled at 17.5% AM, 7.5% AA, 3% ODAAC and 1.5% SMA hydrophobic functional monomer, 25% AMPS salt-tolerant monomer, 0.2% chelating agent EDTA , the total mass of the reaction system is 1000g, and the solution is dissolved by magnetic stirring;

[0043] (2) Use 30% NaOH solution to adjust the pH of the system to 6.5;

[0044] (3) Lower the temperature in an ice-water bath, and when the system temperature drops to 2°C, add the monomer solution into a thermos;

[0045] (4) After passing the nitrogen for 40 minutes, add the initiator in an amount of 0.078% (calculated based on the total mass of the monomer) m((NH 4 ) 2 S 2 o 8 ):m(NaHSO 3 ):m(Vc):m(V 50 )=9:4:5:2, when the solution became viscous, the nitrogen flow was stopped, and after standing for 5 h, a whit...

Embodiment 3

[0054] Preparation of low-temperature instant salt-resistant integrated water-based thickener for fracturing fluid

[0055] (1) By adding an appropriate amount of distilled water, the total mass of the monomer is controlled at 17.5% AM, 7.5% AA, 3% ODAAC and 1% SMA hydrophobic functional monomer, 10% AMPS salt-tolerant monomer, 0.2% chelating agent EDTA , the total mass of the reaction system is 1000 g, and the solution is dissolved by magnetic stirring;

[0056] (2) Use 30% NaOH solution to adjust the pH of the system to 6.8;

[0057] (3) Lower the temperature in an ice-water bath, and when the system temperature drops to 2°C, add the monomer solution into a thermos;

[0058] (4) After passing the nitrogen for 40 minutes, add the initiator in an amount of 0.072% (calculated based on the total mass of the monomer) m((NH 4 ) 2 S 2 o 8 ):m(NaHSO 3 ):m(Vc):m(V 50 )=9:4:5:2, when the solution became viscous, the nitrogen flow was stopped, and after standing for 5 h, a white...

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Abstract

The invention discloses a low-temperature instant salt-resistant integrated water-based thickening agent for a fracturing fluid and a preparation method of the thickening agent. The preparation method comprises the following steps: with octadecyl dimethyl allyl ammonium chloride and octadecyl methacrylate as functional monomers, adding acrylamide, acrylic acid and a salt-resistant monomer, crushing salt-resistant hydrophobic associated polyacrylamide prepared by an aqueous solution polymerization method, uniformly mixing the crushed salt-resistant hydrophobic associated polyacrylamide with a dispersant and a dispersion stabilizer, adding a dispersoid and a dispersion aid, and conducting stirring at a high speed to obtain the low-temperature instant salt-resistant integrated water-based thickening agent for the fracturing fluid. The low-temperature instant salt-tolerant integrated water-based thickening agent for the fracturing fluid prepared by the invention has the characteristics of good salt tolerance, sand suspension, shear resistance and the like, is high in dissolving speed, strong in sand suspension capacity, good in salt tolerance, applicable to high-salinity water quality liquid preparation, capable of realizing on-site continuous mixing and real-time pump injection, capable of meeting the requirement of large-displacement construction, low in stratum pollution and low in cost.

Description

technical field [0001] The invention relates to a low-temperature instant salt-resistant integrated water-based thickener for fracturing fluid and a preparation method thereof, in particular to the technical field of enhanced oil recovery for oil and gas field development. Background technique [0002] With the increasing number of oilfield development and production, conventional oil and gas fields are gradually decreasing, and unconventional oil and gas reservoirs containing ultra-low permeability oil and gas reservoirs are becoming more and more important in energy supply around the world. At present, unconventional natural gas production in the United States accounts for more than 43% of current energy supply, while tight sandstone gas accounts for about 70% of unconventional natural gas production, and most of the reserves have not yet been developed. In the United States, 25-30% of the oil reserves that have become economically exploitable through fracturing. In order...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/88C08F220/56C08F220/06C08F226/02C08F220/18C08F220/58
CPCC09K8/68C09K8/882C08F220/56C08F220/585C08F220/06C08F226/02C08F220/1818Y02P20/10
Inventor 王磊范美玲赖小娟刘卫博文新刘永杨雯雯
Owner 陕西融森实业有限公司
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