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Preparation method of underground self-crosslinking acrylamide polymer for deep formation profile control and flooding

An acrylamide and polymer technology, which is applied in the field of preparation of underground self-crosslinking acrylamide polymers, can solve the problems of unstable gel formation, poor deep effective blocking ability, difficult injection, etc., and achieves stable gel formation, The effect of high gel forming rate

Active Publication Date: 2020-08-04
大庆市新万通科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the low gelation rate and unstable gelation of the existing self-crosslinked polyacrylamide, it is not suitable for high salinity reservoir conditions. It has been crosslinked before injection, and it is difficult to inject and cannot enter low-permeability layers. It is effective in deep sealing Poor capacity and other problems, the present invention provides a method for preparing underground self-crosslinking acrylamide polymers for deep formation control and flooding

Method used

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  • Preparation method of underground self-crosslinking acrylamide polymer for deep formation profile control and flooding
  • Preparation method of underground self-crosslinking acrylamide polymer for deep formation profile control and flooding
  • Preparation method of underground self-crosslinking acrylamide polymer for deep formation profile control and flooding

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Embodiment 1

[0032] A method for preparing an underground self-crosslinking acrylamide polymer for deep formation control and flooding, comprising the following steps:

[0033] (1) Take polyacrylamide and add it to water, add sodium hydroxide to adjust the pH, add paraformaldehyde, modify the reaction with paraformaldehyde at room temperature, adjust the pH value to 6 to terminate the reaction, and generate a self-crosslinking functional group The polymer aqueous solution, the mass ratio of polyacrylamide and paraformaldehyde is: 1:1, the mass ratio of polyacrylamide and water is 1:99, the mass ratio of polyacrylamide: sodium hydroxide is: 10:1;

[0034] (2) Transport the polymer aqueous solution with self-crosslinking functional groups to the formation, then add oxalic acid, and carry out intermolecular crosslinking at the applied formation temperature to obtain self-crosslinking acrylamide polymers. The mass ratio of acrylamide is: 2:5.

Embodiment 2

[0036] The preparation method of the underground self-crosslinking type acrylamide polymer used for formation deep regulation and flooding described in Example 1, the difference is:

[0037] Step (1) The mass ratio of polyacrylamide: sodium hydroxide is 10:2.

Embodiment 3

[0039] The preparation method of the underground self-crosslinking type acrylamide polymer used for formation deep regulation and flooding described in Example 1, the difference is:

[0040] Step (1) The mass ratio of polyacrylamide to paraformaldehyde is 5:4.

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Abstract

The invention relates to a preparation method of an underground self-crosslinking acrylamide polymer for deep formation profile control. The method comprises the following steps: carrying out a modification reaction on an acrylamide polymer and a modifier in a water system environment under the condition that the pH value is 9-12 to generate a polymer aqueous solution with a self-crosslinking functional group, and conveying the polymer aqueous solution with the self-crosslinking functional group to a stratum, and then carrying out intermolecular crosslinking through the catalyst at the application stratum temperature; due to the fact that modification of the polymer is completed before on-site injection, the polymer aqueous solution with the self-crosslinking functional group is generated,the aqueous solution is easy to inject in a form of an aqueous solution and easily enters a low-permeability layer, and the influence of various factors of the application stratum on the gelling performance of the application stratum is reduced. Under the catalytic action of the catalyst under the condition of an oil reservoir, active functional groups on the modified polymer and hydroxymethyl groups or amido groups on different polymers are subjected to a cross-linking reaction, so that the system is gelatinized, the gelling rate is high, and the gelling performance is stable.

Description

Technical field: [0001] The invention relates to a method for preparing an underground self-crosslinking acrylamide polymer used for deep formation control and flooding, and belongs to the technical field of oil and gas field development. Background technique: [0002] With the development of oil extraction technology, especially the application of new technologies for enhanced oil recovery in recent years, polymer flooding technology occupies a very important position in the methods of enhanced oil recovery (EOR). Therefore, my country Polymer flooding technology has been widely used in major oil fields. In 2000, China's use of polymer flooding technology can increase crude oil production by more than 10 million tons. [0003] The common polymer oil displacement agent is polyacrylamide. Polyacrylamide (PAM) and its derivatives are the most important products in water-soluble oil displacement polymers, and have been widely used in tertiary oil recovery in oil fields. Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/00C08F120/56C08J3/24C09K8/508C09K8/588C08L33/26
CPCC08F8/28C08J3/24C09K8/5083C09K8/588C08J2333/26C08F120/56
Inventor 吴凤祥
Owner 大庆市新万通科技开发有限公司
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