Crosslinking agent for polyacrylamide water plugging agent, and preparation method and application of crosslinking agent

A technology of polyacrylamide and cross-linking agent is applied in the field of cross-linking agent of polyacrylamide water blocking agent, which can solve the problems of fast gel formation, easy precipitation, poor viscoelasticity, etc. Coagulation phenomenon, good injection effect

Active Publication Date: 2019-12-20
石家庄市宝玮环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a polyacrylamide water blocking agent cross-linking agent to solve the problems of easy precipitation, too fast gelation speed and poor viscoelasticity when the gel formed by using the existing cross-linking agent is stored.

Method used

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  • Crosslinking agent for polyacrylamide water plugging agent, and preparation method and application of crosslinking agent
  • Crosslinking agent for polyacrylamide water plugging agent, and preparation method and application of crosslinking agent
  • Crosslinking agent for polyacrylamide water plugging agent, and preparation method and application of crosslinking agent

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preparation example Construction

[0024] A preparation method of a cross-linking agent of polyacrylamide water blocking agent, comprising the following steps:

[0025] S1, adding deionized water, chromium nicotinate complex, aluminum citrate, sodium carboxymethylcellulose and organic acid into the stirring reactor in sequence, and stirring and reacting at 80°C to 90°C for 6h to 9h; and

[0026] S2, adding an acidity regulator to the mixed solution after the stirring reaction in S1 to adjust to alkalinity to obtain a crosslinking agent product.

[0027] In S2, an acidity regulator is used to adjust the pH of the mixture to 7-8.

[0028] An application of the cross-linking agent in polyacrylamide water blocking agent, the mass ratio of the cross-linking agent to the polyacrylamide is 3-6:7-12.

Embodiment 1

[0030] Select raw materials by weight percentage

[0031]

[0032] Concrete preparation steps are:

[0033] (1) Deionized water, Cr 2 (C 6 h 4 NO 2 ) 3 Cl 3 , aluminum citrate, sodium carboxymethylcellulose, and malonic acid were sequentially added into the stirred reactor, and stirred and reacted at 80°C for 6h.

[0034] (2) Add ammonia water to the mixed solution after the stirring reaction in step (1), and adjust to 7 to obtain a crosslinking agent product.

[0035] Preparation of water blocking agent: select polyacrylamide with a molecular weight of 14 million (Japan Sanyo Chemical Company, industrial grade), take 4.5g of the above-mentioned polyacrylamide, add it to 1000mL water, stir to dissolve, and then add 1.6g of cross-linking agent to fully Stir to make a weak gel.

[0036] See Table 1 and Table 2 for the viscosity retention rate and gelation time of the weak gel. For storage stability of weak gels see figure 1 . Depend on figure 1 It can be seen that...

Embodiment 2

[0038] Select raw materials by weight percentage

[0039]

[0040] Concrete preparation steps are:

[0041] (1) Deionized water, Cr 2 (C 6 h 4 NO 2 ) 3 Cl 3 , aluminum citrate, sodium carboxymethylcellulose, and malonic acid were sequentially added into the stirred reactor, and stirred and reacted at 90°C for 9h.

[0042] (2) Add sodium carbonate aqueous solution to the mixed solution after the stirring reaction in step (1), and adjust to 8 to obtain a crosslinking agent product.

[0043]Preparation of water blocking agent: same as Example 1.

[0044] See Table 1 and Table 2 for the viscosity retention rate and gelation time of the weak gel.

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Abstract

The invention relates to a crosslinking agent for a polyacrylamide water plugging agent, and a preparation method and application of the crosslinking agent. The crosslinking agent comprises the following components in percentage by mass: 20-30% of a chromium nicotinate complex, 3-5% of aluminum citrate, 15-30% of organic acid, 0.03-0.06% of sodium carboxymethyl cellulose, 15-20% of an acidity regulator and 15-47% of deionized water. A weak gel formed by the cross-linking agent is not easily accumulated during storage, so that the gel forming time can be effectively delayed; and the formed weakgel has good viscoelasticity and water retention property, and also has good shear resistance, low filter volatility and good injectability.

Description

technical field [0001] The invention belongs to the field of chemical auxiliary agents, and in particular relates to a crosslinking agent of polyacrylamide water blocking agent, its preparation method and its application. Background technique [0002] my country's most important energy source is petroleum. In recent years, petroleum has not only occupied the first place in my country's total energy consumption, but its proportion has been rising continuously. At present, almost all oilfields in my country have entered the stage of tertiary oil recovery. As the oil production enters the middle and late stages, the water injection in the oil well makes the injection profile extremely uneven. In some blocks, the injected water breaks through rapidly along the high permeability layer, which makes the formation heterogeneity further. The expansion caused the oil well to produce a large amount of water, and the water content increased sharply. Water from oil wells has brought many...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512
CPCC09K8/5045C09K8/512C09K8/5083C09K8/5086
Inventor 王泓吴海霞翟朋达邢中平张宇田玉敏王奎涛
Owner 石家庄市宝玮环保科技有限公司
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