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A kind of preparation method of cross-linked acrylamide type profile control agent

A technology of acrylamide and profile control agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of pollution, poor temperature and salt resistance, etc., and achieve reduced production costs, good environmental protection, and good stability Effect

Active Publication Date: 2018-03-20
DAQING BEIHUA CHEM PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water plugging with polyacrylamide is still considered to be the most classic and commonly used technical method in oilfields, but its application is limited due to its poor temperature and salt resistance, easy degradation, and damage to formations to varying degrees. The emergence of a cross-linked polyacrylamide system has improved its temperature resistance and salt resistance to a certain extent. However, the inorganic cross-linking agents used such as potassium dichromate, aluminum citrate, various chromium salts and organic Cross-linking agents such as phenol, formaldehyde, thiourea, etc. have certain pollution to the environment and formation

Method used

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  • A kind of preparation method of cross-linked acrylamide type profile control agent
  • A kind of preparation method of cross-linked acrylamide type profile control agent
  • A kind of preparation method of cross-linked acrylamide type profile control agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of cross-linked acrylamide profile control agent, the preparation steps are as follows:

[0024] After 0.1g of chitosan is completely dissolved in 100mL of glacial acetic acid with a volume fraction of 2%, add 0.2g of potassium persulfate at 60°C and pass N 2 An inert environment is formed. After 10 minutes, 50 mL of a mixed solution of 10 g of acrylamide and 1 g of 2-acrylamido-2-methylpropanesulfonic acid is added, and radical polymerization is carried out to form the first product. Then, the product of the first step was placed at 110°C for nucleophilic addition reaction, and the reaction was conducted for 3 hours to obtain a polymer gel.

[0025] After purifying and drying the polymer gel profile control agent and the cross-linking agent chitosan, perform an infrared test to obtain an infrared spectrum, as attached figure 1 As shown, the results of the spectrogram analysis are shown in Table 1.

[0026] Table 1 Infrared spectrogram analysis results of ...

Embodiment 2

[0031] After 0.1 g of chitosan is completely dissolved in 100 mL of glacial acetic acid with a volume fraction of 2%, add 0.2 g of potassium persulfate-sodium sulfite (the molar ratio of the two is 1:1) at 50°C, and pass N 2 An inert environment is formed. After 10 minutes, 50 mL of a mixed solution of 10 g of acrylamide and 1 g of 2-acrylamido-2-methylpropanesulfonic acid is added, and radical polymerization is carried out to form the first product. Then, the product of the first step was placed at 110°C for nucleophilic addition reaction, and the reaction was conducted for 3 hours to obtain a polymer gel.

[0032] During the test, use NDJ-8S viscometer to measure the viscosity of the gel. figure 2 And image 3 As shown, the temperature resistance range is 100~140℃; the applicable coarse salt concentration range: 0~25×10 4 mg / L.

Embodiment 3

[0034] After 0.1g of chitosan is completely dissolved in 100mL of glacial acetic acid with a volume fraction of 2%, add 0.2g of potassium persulfate at 55°C and pass N 2 An inert environment is formed. After 10 minutes, 50 mL of a mixed solution of 10 g of acrylamide and 1 g of styrene sulfonic acid is added to carry out free radical polymerization to form the first step product. Then, the product of the first step was placed at 110°C for nucleophilic addition reaction, and the reaction was conducted for 3 hours to obtain a polymer gel.

[0035] During the test, use NDJ-8S viscometer to measure the viscosity of the gel. figure 2 And image 3 As shown, the temperature resistance range is 100~140℃; the applicable coarse salt concentration range: 0~25×10 4 mg / L.

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Abstract

The invention relates to a method for preparing a cross-linking acrylamide profile control agent. The method comprises the steps of completely dissolving a cross-linking agent through acid, adding an initiator, leading in N2, adding a mixed solution of acrylamide and sulfonyl-containing monomers, performing free radical polymerization reaction in the closed atmosphere of N2 to form a product, causing the product to undergo the nucleophilic addition reaction, and obtaining polymer gel. The method has the advantages that raw materials are extensive, easy to obtain and low in cost; the cross-linking acrylamide profile control agent has good environmental friendliness compared with frequently-used chromic salt and phenolic aldehyde and the like; the viscosity of a system, gelling time and the performances of gel after gelling are controlled through the changing of the concentration or reaction temperature of the monomers, the cross-linking agent and the initiator; when the environment temperature range is 100-140 DEG C, no obvious degradation occurs, and the viscosity retention rate is high; and when the coarse salt concentration range is 0-2.5*105 mg / L, the cross-linking acrylamide profile control agent can have good stability and is not subjected to gel breaking and precipitation.

Description

Technical field [0001] The invention relates to a preparation method of a cross-linked acrylamide profile control agent, which belongs to the field of oil field chemistry. Background technique [0002] In the 1970s, the appearance of polyacrylamide (PAM) created a new situation for chemical profile control and water shutoff technology. For more than 40 years, certain achievements have been made in profile control of water wells and water plugging of oil wells. Water plugging with polyacrylamide is still considered to be the most classic and most commonly used technical method in oilfields. However, its application is limited due to its poor temperature and salt resistance, easy degradation, and damage to the formation to varying degrees. The emergence of a kind of cross-linked polyacrylamide system has improved its temperature resistance and salt resistance to a certain extent. However, the inorganic cross-linking agents used such as potassium dichromate, aluminum citrate, vario...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/56C08F212/14C08F220/58C08G81/02C09K8/512
Inventor 杨隽王芬潘小杰徐黎刚闫霜姚棋
Owner DAQING BEIHUA CHEM PLANT
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