Nitrogen-containing heterocyclic solid cross-linking agent, and preparation method and application thereof

A technology of cross-linking agent and nitrogen heterocycle is applied in the field of nitrogen-containing heterocyclic solid cross-linking agent and its preparation, which can solve the problems of low construction success rate, short gel-forming time, high biological toxicity, etc. The effect of adjustable rate, glue forming time and glue forming strength

Inactive Publication Date: 2018-02-02
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used metal ion cross-linking agent has a short gelation time and poor thermal stability, and its application range is limited to medium and low temperature oil reservoirs
The organic phenolic cross-linking agent has high biological toxicity, and it is easy to spontaneously polymerize when the liquid is mixed on the ground, and the construction success rate is low

Method used

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  • Nitrogen-containing heterocyclic solid cross-linking agent, and preparation method and application thereof
  • Nitrogen-containing heterocyclic solid cross-linking agent, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weigh 40g of 1,3,5-triazine-2,4,6-triamine, 40g of hexamethylenetetramine, and 20g of anhydrous sodium sulfite, mix the above materials thoroughly, and stir evenly to obtain a nitrogen-containing heterocyclic solid crosslinking agent.

[0044] The application of this nitrogen-containing heterocyclic solid crosslinking agent specifically comprises the following steps:

[0045] Add partially hydrolyzed polyacrylamide into water under rapid stirring conditions to obtain a polyacrylamide solution with a mass concentration of 0.2%, and mature it for 24 hours to obtain a mature solution; then add 0.2% nitrogen-containing heterocyclic solid cross-linking agent, and use acetic acid to adjust The pH of the system is 5-6, and the reaction base liquid is obtained after stirring evenly; the reaction base liquid is placed in an oven at 60°C and kept at a constant temperature until gelling to obtain the profile control agent. The gelling time is 5 days, and the gelling viscosity is ...

Embodiment 2

[0047]Weigh 44g of 1,3,5-triazine-2,4,6-triamine, 44g of hexamethylenetetramine, 8g of thiourea, and 4g of anhydrous sodium sulfite, mix the above materials thoroughly, and stir evenly to obtain the Nitrogen heterocyclic solid crosslinking agent.

[0048] The application of this nitrogen-containing heterocyclic solid crosslinking agent specifically comprises the following steps:

[0049] Add partially hydrolyzed polyacrylamide into water under rapid stirring conditions to obtain a polyacrylamide solution with a mass concentration of 0.3%, and mature it for 24 hours to obtain a mature solution; then add 0.3% nitrogen-containing heterocyclic solid cross-linking agent, and use acetic acid to adjust The pH of the system is 5-6, and the reaction base liquid is obtained after stirring evenly; the reaction base liquid is placed in an oven at 60°C and kept at a constant temperature until gelling to obtain the profile control agent. The gelling time is 3 days, and the gelling viscosit...

Embodiment 3

[0051] Weigh 42g of 1,3,5-triazine-2,4,6-triamine, 42g of hexamethylenetetramine, and 16g of anhydrous sodium sulfite, mix the above materials thoroughly, and stir evenly to obtain a nitrogen-containing heterocyclic solid crosslinking agent.

[0052] The application of this nitrogen-containing heterocyclic solid crosslinking agent specifically comprises the following steps:

[0053] Add partially hydrolyzed polyacrylamide into water under rapid stirring conditions to obtain a polyacrylamide solution with a mass concentration of 0.4%, and mature it for 24 hours to obtain a mature solution; then add 0.4% nitrogen-containing heterocyclic solid cross-linking agent, and use hydrochloric acid to adjust The pH of the system is 5-6, and the reaction base liquid is obtained after stirring evenly; the reaction base liquid is placed in an oven at 70°C and kept at a constant temperature until gelling to obtain a profile control agent. The gelling time is 2 days, and the gelling viscosity...

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Abstract

The invention discloses a nitrogen-containing heterocyclic solid cross-linking agent, and a preparation method and an application thereof, and belongs to the technical field of oilfield chemistry. Thecross-linking agent comprises, by mass, 40-45% of 1,3,5-triazine-2,4,6-triamine, 40-45% of hexamethylenetetramine and 10-20% of a stabilizer. When the cross-linking agent is used in the preparation of a cross-linked polymer gel profile control agent, the gelling temperature is 40-70 DEG C, the gelling time is controlled at 2-7 d, the final gel viscosity is up to 8000 mPa.s or more, the formed gelsystem is stable, and the 90 d strength retention rate of the gel is greater than 80%. The cross-linking agent can effectively adjust the water injection profile, realizes high-efficiency plugging ofa target layer and improves the oil recovery ratio.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a nitrogen-containing heterocyclic solid crosslinking agent and its preparation method and application. Background technique [0002] Oil well water production is a common problem in the process of oilfield development, especially in the middle and later stages of development. The injected water often seeps into the oil well along the high permeability layer, which seriously affects the water flooding development effect, reduces the oil recovery efficiency of the oilfield, and leads to a decline in the productivity of the oil well. In order to solve the above problems, the technology of water plugging and profile control in oil reservoirs has been paid attention to and developed in the development of oil and gas fields. Cross-linking agent is a chemical reagent commonly used in the process of water plugging and profile control in oilfields. It can react with polyacryla...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C09K8/512C09K8/88C08J3/24C08L33/26
CPCC09K8/512C08J3/24C08J2333/26C09K8/887
Inventor孙磊徐鸿志张贵清夏烨刘小攀郝志伟赵文娜王宇宾
OwnerBC P INC CHINA NAT PETROLEUM CORP