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High temperature-resistant acidic cross-linked polymer thickening agent, and preparation method and application thereof

A technology of cross-linked polymer and thickening agent, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of thermal stability, poor compatibility of salt-tolerant formation water, etc., and achieve good compatibility and low damage degree. , the effect of reducing core permeability

Active Publication Date: 2014-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyethylene oxide thickeners were developed abroad in the late 1990s, and polyvinylamine (VAM) water-soluble polymers such as polyvinyl formamide and polyvinyl acetamide were reported to be used as fracturing fluid thickeners , its main features are strong acid resistance, calcium salt resistance, and good temperature resistance, which can be used for acid fracturing at higher temperatures, but its thermal stability, salt resistance, and poor compatibility with formation water

Method used

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  • High temperature-resistant acidic cross-linked polymer thickening agent, and preparation method and application thereof
  • High temperature-resistant acidic cross-linked polymer thickening agent, and preparation method and application thereof
  • High temperature-resistant acidic cross-linked polymer thickening agent, and preparation method and application thereof

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Embodiment 1

[0044] The high temperature resistant acidic cross-linked polymer thickener in this embodiment consists of four monomers of acrylic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and sodium p-vinylbenzenesulfonate at a pH value of 6 aqueous solution copolymerization, wherein the mass ratio of 2-acrylamide-2-methylpropanesulfonic acid to sodium p-vinylbenzenesulfonate is 4:1, acrylic acid, acrylamide and 2-acrylamide-2 - The mass ratio of the mixture of methylpropanesulfonic acid and sodium p-vinylbenzenesulfonate is 1:8:2.

[0045] The preparation method of high temperature resistant acidic crosslinked polymer thickener in the present embodiment comprises the following steps:

[0046] (1) Solution preparation: Accurately take each monomer according to the mass ratio, add water to prepare a monomer solution with a concentration of 30%, stir and dissolve for 30 minutes, adjust the pH value of the solution to 6.5 under stirring conditions, and continue to stir and ma...

Embodiment 2

[0051] The high-temperature-resistant acidic cross-linked polymer thickener in this embodiment is composed of four monomers of acrylic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, and sodium p-propenylbenzenesulfonate at a pH value of 7 aqueous solution copolymerization, wherein the mass ratio of 2-acrylamide-2-methylpropanesulfonic acid to sodium p-propenylbenzenesulfonate is 5:1, acrylic acid, acrylamide and 2-acrylamide- The mass ratio of the mixture of 2-methylpropanesulfonic acid and sodium p-propenylbenzenesulfonate is 1.5:10:2.

[0052] The preparation method of high temperature resistant acidic crosslinked polymer thickener in the present embodiment comprises the following steps:

[0053] (1) Solution preparation: Accurately take each monomer according to the mass ratio, add water to prepare a monomer solution with a concentration of 25%, stir and dissolve for 30 minutes, adjust the pH value of the solution to 7 under stirring conditions, and continue t...

Embodiment 3

[0058] The high temperature resistant acidic cross-linked polymer thickener in this embodiment consists of four monomers of acrylic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and sodium p-vinylbenzenesulfonate at a pH value of 8 aqueous solution copolymerization, wherein the mass ratio of 2-acrylamide-2-methylpropanesulfonic acid to sodium p-vinylbenzenesulfonate is 8:1, acrylic acid, acrylamide and 2-acrylamide-2 - The mass ratio of the mixture of methylpropanesulfonic acid and sodium p-vinylbenzenesulfonate is 1:15:4.

[0059] The preparation method of high temperature resistant acidic crosslinked polymer thickener in the present embodiment comprises the following steps:

[0060] (1) Solution preparation: Accurately take each monomer according to the mass ratio, add water to prepare a monomer solution with a concentration of 40%, stir and dissolve for 30 minutes, adjust the pH value of the solution to 7 under stirring conditions, and continue to stir and mat...

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Abstract

The invention discloses a high temperature-resistant acidic cross-linked polymer thickening agent and a preparation method and application thereof, which belongs to the technical field of fracturing fluids used for oil field reservoir reconstruction. The thickening agent is a straight-chain low-molecular polymer which is formed by copolymerization of four monomers consisting of acrylic acid, acrylamide, 2-acrylamido-methylpropanesulfonate and p-alkenyl benzene sulfonate and is cross-linkable under an acidic condition; the thickening agent has the advantages of high sand-carrying performance, shearing resistance, easy dissolving, no pollution and little damage to a reservoir; since the thickening agent has a benzene ring structure, the thickening agent has high temperature resistance and is applicable to fracturing of high-temperature and strong base-sensitive strata. The preparation method for the high temperature-resistant acidic cross-linked low-molecular thickening agent is simple, has low cost and is applicable to large-scale production and application. A gel breaking system prepared from the thickening agent is jelly-like, does not suffer from precipitation and separation, has good compatibility and excellent sand-carrying performance and gel breaking performance and poses less damage to the reservoir.

Description

technical field [0001] The invention specifically relates to a high-temperature-resistant acidic cross-linked polymer thickener, and also relates to a preparation method and application of the thickener, and belongs to the technical field of fracturing fluid for oilfield reservoir reconstruction. Background technique [0002] The purpose of hydraulic fracturing is to form fractures with a certain size and conductivity in the formation through high-pressure injection of fracturing fluid. The water-based system is currently the most widely used fracturing fluid, which uses water as the dispersion medium and adds various Treatment agents, especially water-soluble polymers, form a working fluid with strong comprehensive properties required by the fracturing process. [0003] The water-based fracturing fluid thickener is mainly a synthetic polymer made of guar gum. Due to the large molecular weight of guar gum, which is about 2 million, the thickener contains relatively high resi...

Claims

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Application Information

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IPC IPC(8): C08F220/58C08F212/14C08F220/06C08F220/56C08F4/40C09K8/68
Inventor 刘欣刘洪涛贾跃立常李博李梦楠蒋尔梁解勇珍许连洁孙彬峰
Owner CHINA PETROLEUM & CHEM CORP
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