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Stretchable slow-expansion acrylic resin as well as preparation process and application thereof

A technology of acrylic resin and preparation process, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of fast water absorption expansion rate, broken, unreachable, etc., achieve controllable expansion, change poor shear resistance Effect

Pending Publication Date: 2021-02-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the difficulty of mining continues to increase, polymer microspheres also show some problems, such as rapid water absorption and expansion, can only seal large pores, and are completely broken when they reach the formation under the action of strong shear force of the formation. , can not achieve the expected goal

Method used

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  • Stretchable slow-expansion acrylic resin as well as preparation process and application thereof
  • Stretchable slow-expansion acrylic resin as well as preparation process and application thereof
  • Stretchable slow-expansion acrylic resin as well as preparation process and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment provides a stretchable slow-swelling acrylic resin, which is obtained by free radical polymerization of polyacrylamide and linear polymer in aqueous solution.

[0039] In the stretchable slow-swelling acrylic resin provided by the present invention, the first cross-linked network formed by polyacrylamide and the second network of the linear polymer solution are polymerized by free radical aqueous solution to prepare a highly elastic and slow-swelled acrylic resin , to overcome the current conventional polyacrylamide, unstable, weak, anti-fatigue, poor shear resistance defects.

Embodiment 2

[0041] On the basis of Example 1, this example provides a stretchable slow-swelling acrylic resin, the mass percentage of the polyacrylamide is 17-36%, and the mass percentage of the linear polymer is 2-5% %, the balance is water.

[0042] Using polyacrylamide as the first cross-linked network and linear polymer as the second network, an interpenetrating network hydrogel is formed.

Embodiment 3

[0044] On the basis of Example 2, this example provides a stretchable slow-swelling acrylic resin, the mass percent of the polyacrylamide is 35.5%, the mass percent of the linear polymer is 5%, and the water is 59.5%.

[0045] In this example, polyacrylamide is obtained by crosslinking reaction of 20% acrylamide, 10% acrylic acid, 0.5% tetramethylethylenediamine crosslinking agent and 5% long carbon chain type functional association monomer. Acrylamide; the linear polymer is a mixture of carrageenan and xanthan gum with a mass ratio of 3:1.

[0046] The preparation process is as follows:

[0047] Step 1) Add the formulated amount of acrylamide, acrylic acid, tetramethylethylenediamine crosslinking agent, and long carbon chain functional associative monomer to some water to form a polyacrylamide solution as the first crosslinking network;

[0048]Step 2) Add the formulated amount of linear polymer to the remaining water at 80~100°C, place it on a magnetic stirrer and stir for...

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Abstract

The invention provides stretchable slow-expansion acrylic resin as well as a preparation process and application thereof. A first cross-linked network is formed by acrylamide / acrylic acid / functional monomers under the action of a cross-linking agent, and then linear macromolecules are introduced as a second network; the novel interpenetrating network water-absorbent resin is prepared through the acting force and the hydrophobic association effect between molecules. According to the novel interpenetrating network resin, the osmotic pressure difference between the inside and the outside of the resin is changed by introducing a shielding water absorption group, so that free water slowly passes through the resin, and good slow expansion performance is obtained. Through experimental tests, thetensile stress of the resin can reach 2-5 MPa, the water absorption rate is reduced from conventional 20 times / day to 2 times / day, the resin still shows good performance after free water expansion, the problems that an existing profile control agent expands too fast and is poor in shearing capacity when passing through a stratum are solved, and the resin can be used for deep profile control.

Description

technical field [0001] The invention belongs to the technical field of profile control and plugging in oil and gas fields, and in particular relates to a stretchable slow-swelling acrylic resin and its preparation process and application. Background technique [0002] At present, the high water content of water injection wells increases year by year after repeated water injection in most oilfields, and the formation pressure and energy are insufficient, which brings a lot of inconvenience to oilfield production. Studies have shown that conventional oil recovery methods can no longer meet the requirements, and how to efficiently improve oil recovery has become an urgent problem to be solved. [0003] Conventional profile control and water shutoff agents, such as the earliest monolithic jelly, have relatively high strength, but the function of the monolithic gel is seriously affected by the shearing of formation rocks and the dilution of formation water, and there is a problem...

Claims

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Application Information

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IPC IPC(8): C09K8/588C09K8/512C08F220/56C08F220/06
CPCC09K8/588C09K8/512C08F220/56C08F220/06
Inventor 宋昭杰杨海恩吕伟何治武郑力军易萍吴天江张荣朱家杰程辰
Owner PETROCHINA CO LTD
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