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 fe

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

Examples

Experimental program
Comparison scheme
Effect test

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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