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Crosslinker for polyacrylamide water shutoff agent, and preparation method thereof

A technology of polyacrylamide and cross-linking agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of fast gelation speed, poor viscoelasticity, easy precipitation, etc., and achieve low fluid loss, good Injectability, the effect of delaying the gelation time

Inactive Publication Date: 2019-09-06
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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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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  • Crosslinker for polyacrylamide water shutoff agent, and preparation method thereof
  • Crosslinker for polyacrylamide water shutoff agent, and preparation method thereof
  • Crosslinker for polyacrylamide water shutoff agent, and preparation method thereof

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preparation example Construction

[0023] A preparation method of a cross-linking agent of polyacrylamide water blocking agent, comprising the following steps:

[0024] S1, adding deionized water, chromium nicotinate complex, aluminum citrate, sodium carboxymethylcellulose and organic acid into the stirring reactor in sequence, stirring and reacting at 80°C to 90°C for 6h to 9h; and

[0025] 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.

[0026] In S2, an acidity regulator is used to adjust the pH of the mixture to 7-8.

Embodiment 1

[0028] Select raw materials by weight percentage

[0029] Cr 2 (C 6 h 4 NO 2 ) 3 Cl 3 : 20%

[0030] Aluminum citrate: 5%

[0031] Malonic acid: 15%

[0032] Sodium carboxymethylcellulose: 0.03%

[0033] Ammonia water (0.14×10 -2 mol / L): 15%

[0034] Deionized water: 44.97%

[0035] Concrete preparation steps are:

[0036] (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.

[0037] (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.

[0038] Preparation of weak gel: select polyacrylamide with a molecular weight of 14 million (Japan Sanyo Chemical Company, industrial grade), and prepare a polyacrylamide mother solution with a concentration of 1000 mg / L. Take 350g of polyacrylamide mother liquor and 200g of cross-linki...

Embodiment 2

[0041] Select raw materials by weight percentage

[0042] Cr 2 (C 6 h 4 NO 2 ) 3 Cl 3 : 25%

[0043] Aluminum citrate: 4%

[0044] Malonic acid: 30%

[0045]Sodium carboxymethylcellulose: 0.06%

[0046] Sodium carbonate aqueous solution (0.16×10 -2 mol / L): 15.94%

[0047] Deionized water: 25%

[0048] Concrete preparation steps are:

[0049] (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.

[0050] (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.

[0051] The preparation of weak gel: with embodiment 1.

[0052] 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 crosslinker for a polyacrylamide water shutoff agent, and a preparation method thereof. The crosslinker comprises, by mass, 20-30% of a chromium nicotinate complex, 3-5% ofaluminum citrate, 15-30% of an organic acid, 0.03-0.06% of sodium carboxymethylcellulose, 15-20% of an acidity regulator and 15-47% of deionized water. A weak gel formed by using the crosslinker is not prone to coagulate during storage, and also has the advantages of effectiveness in delaying the gelation time, good viscoelasticity, good water retention, excellent shear resistance, low fluid lossand 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 and a preparation method thereof. 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 serious pr...

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 HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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