Medium-low molecular weight rigid tackifying polymer, and preparation method and applications thereof

A low molecular weight, polymer technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of increasing the cost of crude oil extraction, poor temperature resistance, salt resistance, and failure to use normally, and achieve good compatibility properties, good salt resistance, and high solution apparent viscosity

Active Publication Date: 2015-09-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for oil reservoirs with low permeability, ultra-high molecular weight hydrolyzed polyacrylamide is prone to structural plugging, and the injection pressure is close to the formation fracture pressure, so it cannot be used normally
Although medium and low molecular weight hydrolyzed polyacrylamide can meet the compatibility requirements of oil reservoirs, its thickening effect is small, and its temperature resistance and salt resistance are poor. economic effect

Method used

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  • Medium-low molecular weight rigid tackifying polymer, and preparation method and applications thereof
  • Medium-low molecular weight rigid tackifying polymer, and preparation method and applications thereof
  • Medium-low molecular weight rigid tackifying polymer, and preparation method and applications thereof

Examples

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Embodiment 1

[0036] This embodiment provides a kind of medium and low molecular weight rigid tackifying polymer, wherein, the polymer is made of acrylic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, 2-acrylamidoeicosylsulfonic acid Sodium acid four monomers are obtained by micellar radical polymerization.

[0037] The above-mentioned low and medium molecular weight rigid tackifying polymer is prepared through the following steps:

[0038] Put 0.02g sodium 2-acrylamidoeicosylsulfonate and 0.1g sodium dodecyl sulfate (SDS) in a 150mL beaker, add 23g distilled water, heat to 60°C, stir for 1-2 hours to reach a solution Transparent, completely dissolve 2-acrylamido eicosyl sodium sulfonate and sodium lauryl sulfate to obtain a uniform micellar solution;

[0039] Add 15g acrylamide (AM), 7g acrylic acid (AA), 5g 2-acrylamide-2-methylpropanesulfonic acid (AMPS) to 50g distilled water again, then add 7g anhydrous sodium carbonate (Na 2 CO 3 ), the pH value of the solution is adj...

Embodiment 2

[0043] This embodiment provides a kind of medium and low molecular weight rigid tackifying polymer, wherein, the polymer is made of acrylic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, 2-acrylamidoeicosylsulfonic acid Sodium acid four monomers are obtained by micellar radical polymerization.

[0044] The above-mentioned low and medium molecular weight rigid tackifying polymer is prepared through the following steps:

[0045] Put 0.12g sodium 2-acrylamido eicosylsulfonate and 0.4g sodium dodecyl sulfate (SDS) in a 150mL beaker, add 36g distilled water, heat to 60°C, and stir for 2-3 hours to reach a solution Transparent, completely dissolve 2-acrylamido eicosyl sodium sulfonate and sodium lauryl sulfate to obtain a uniform micellar solution;

[0046] Add 15g acrylamide (AM), 7g acrylic acid (AA), 5g 2-acrylamide-2-methylpropanesulfonic acid (AMPS) to 37g distilled water again, then add 7g anhydrous sodium carbonate (Na 2 CO 3 ), the pH value of the solution i...

Embodiment 3

[0050] This embodiment provides a kind of medium and low molecular weight rigid tackifying polymer, wherein, the polymer is made of acrylic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, 2-acrylamidoeicosylsulfonic acid Sodium acid four monomers are obtained by micellar radical polymerization.

[0051] The above-mentioned low and medium molecular weight rigid tackifying polymer is prepared through the following steps:

[0052] Put 1.2g sodium 2-acrylamidoeicosylsulfonate and 0.4g sodium dodecyl sulfate (SDS) in a 150mL beaker, add 36g distilled water, heat to 60°C, and stir for 2-3 hours to reach a solution Transparent, completely dissolve 2-acrylamido eicosyl sodium sulfonate and sodium lauryl sulfate to obtain a uniform micellar solution;

[0053] Add 15g acrylamide (AM), 7g acrylic acid (AA), 5g 2-acrylamide-2-methylpropanesulfonic acid (AMPS) to 37g distilled water again, then add 9g anhydrous sodium carbonate (Na 2 CO 3 ), the pH value of the solution is ...

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Abstract

The invention provides a medium-low molecular weight rigid tackifying polymer. The medium-low molecular weight rigid tackifying polymer is obtained via micelle free radical polymerization of four monomers, acrylic acid, acrylamide, 2-acrylamido-2-methylpropane sulfonic acid, 2-acrylamido sodium alkyl sulfonate, wherein alkyl carbon number of the 2-acrylamido sodium alkyl sulfonate ranges from 16 to 24, the structure of the 2-acrylamido sodium alkyl sulfonate is represented by a formula in the invention, and R in the formula is used for representing C<14-22>H<29-45>. The invention also provides a preparation method and applications of the medium-low molecular weight rigid tackifying polymer in low-permeability reservoir oil displacement operation. The medium-low molecular weight rigid tackifying polymer possesses excellent water solubility; molecular weight can be adjusted according to injection requirements of low permeability reservoirs; compatibility is excellent; molecular chain rigidity of the medium-low molecular weight rigid tackifying polymer is relatively high; the medium-low molecular weight rigid tackifying polymer possesses relatively high solution apparent viscosity under relatively high mineralization degree injected water configuration conditions, is excellent in tackability, and is capable of satisfying economic requirements of most oil fields on polymer flooding, and increasing petroleum reservoir exploitation benefits.

Description

technical field [0001] The invention provides a medium and low molecular weight rigid viscosifying polymer and its preparation method and application, especially relates to a kind of viscosifying polymer suitable for polymer flooding and composite oil flooding technology of low permeability reservoirs, which belongs to petroleum exploration technology field. Background technique [0002] Tertiary oil recovery technology has become one of the main measures to enhance oil recovery in China, and the polymer used in tertiary oil recovery is currently mainly polyacrylamide. Ultra-high molecular weight hydrolyzed polyacrylamide has a larger hydrodynamic volume in aqueous solution, and can achieve molecular chain entanglement at a lower concentration, providing higher thickening effect, so it is widely used as a polymer in tertiary oil recovery Oil repellant. However, for oil reservoirs with low permeability, ultra-high molecular weight hydrolyzed polyacrylamide is prone to struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/56C08F220/58C09K8/588
Inventor 朱卓岩陈国浩欧阳坚王凤王源源薛俊杰王超
Owner PETROCHINA CO LTD
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