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Preparation method and application of medium/low-temperature environment-friendly crosslinking agent

A cross-linking agent, an environmentally friendly technology, used in chemical instruments and methods, drilling compositions, organic chemistry, etc., can solve the problems of weak gel strength, serious volatility, and large dosage, and achieve strong gel forming ability. , good stability, less oil layer pollution

Active Publication Date: 2017-11-21
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

Among them, the organic phenolic crosslinking agent is highly volatile, has great toxicity to the environment and operators, and has low responsiveness and large dosage; while the gel strength formed by the transition metal organic crosslinking agent and the polymer is relatively weak , less stable

Method used

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  • Preparation method and application of medium/low-temperature environment-friendly crosslinking agent
  • Preparation method and application of medium/low-temperature environment-friendly crosslinking agent

Examples

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preparation example Construction

[0026] The invention provides a method for preparing a medium-low temperature environment-friendly crosslinking agent, comprising:

[0027] Add the aldehyde solution in the reaction vessel, and adjust the pH value of the solution to within the range of 8-9;

[0028] Adding a stabilizer to the aldehyde solution, stirring evenly to obtain a mixed solution;

[0029] Adding melamine to the mixed solution to obtain a reaction system; wherein the weight ratios of the aldehyde solution, stabilizer and melamine are 20%-25%, 20%-25% and 50%-60% respectively;

[0030] The temperature of the reaction system is raised to 70°C-75°C, and the temperature is maintained at this temperature to fully react to obtain a reaction product, which is the medium-low temperature environment-friendly crosslinking agent.

[0031] It can be seen from the above that since the raw materials for the preparation of crosslinking agents in the present invention do not contain phenolic compounds, the use of mela...

Embodiment 1

[0055] Add 20 g of formaldehyde solution (concentration 37%) in the reaction vessel, and adjust the pH value of the solution to be about 8; add ethylene glycol 20 g to the formaldehyde solution, and stir to obtain a mixed solution; add melamine 60 g to the mixed solution , to obtain a reaction system; the reaction system was heated to 70° C., refluxed at this temperature for 6 hours, the reaction was stopped, and a light yellow liquid product was obtained after cooling, which was the medium-low temperature environmental protection crosslinking agent.

[0056] Configure a polyacrylamide aqueous solution with a mass fraction of 0.3%, adjust the pH of the solution to about 7, and age for 24 hours; then add the medium-low temperature environmental protection crosslinking agent prepared above, and the addition amount is 0.2% of the mass of the polyacrylamide aqueous solution. %, stirred for 10-15min until uniformly dispersed to obtain the base liquid; the base liquid was placed in a...

Embodiment 2

[0059] Add 25 g of formaldehyde solution (concentration 37%) in the reaction vessel, and adjust the pH value of the solution to be within the scope of about 9; add ethylene glycol 20 g to the formaldehyde solution, and stir to obtain a mixed solution; add 55 g of melamine was used to obtain a reaction system; the reaction system was heated to 75° C., refluxed at this temperature for 6 hours, and the reaction was stopped. After cooling, a slightly yellow liquid product was obtained, which was the medium-low temperature environmental protection crosslinking agent.

[0060] Configure a polyacrylamide aqueous solution with a mass fraction of 0.3%, and adjust the pH value of the solution to about 6.5 with 10% acetic acid in a mass concentration, and mature for 24 hours; 0.25% of the mass of polyacrylamide aqueous solution, stirred for 10-15 minutes until uniformly dispersed, to obtain base liquid; put the base liquid in a 40°C constant temperature box, and gel at constant temperatur...

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Abstract

The invention discloses a preparation method and application of a medium / low-temperature environment-friendly crosslinking agent, belonging to the technical field of oilfield chemistry. The preparation method of the crosslinking agent comprises the following steps: adding an aldehyde solution into a reaction vessel, and regulating the pH value of the solution to 8-9; adding a stabilizer, and performing uniform stirring; and finally, adding melamine, performing heating to 70-75 DEG C, and performing a sufficient reaction while keeping at such temperature, thereby obtaining the medium / low-temperature environment-friendly crosslinking agent, wherein the mass percents of the aldehyde solution, stabilizer and melamine are respectively 20-25%, 20-25% and 50-60%. When being used for preparing a crosslinked polymer gel profile control agent, the medium / low-temperature environment-friendly crosslinking agent prepared by the method can form a gel at 40-60 DEG C, and the gel formation time is controllable within the range of 12 hours to 7 days; the formed gel system is stable, and the gel viscosity can reach 8000 mPa.s or above; and the crosslinking agent is safe and nontoxic, has small pollution to the oil reservoir, and satisfies the requirements for safety and environment friendliness in the production process.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a preparation method and application of a medium-low temperature environment-friendly crosslinking agent. Background technique [0002] As my country's oilfield development enters a period of high water cut, most oilfields adopt the water injection development model. Improving the injection capacity and improving the development effect are urgent tasks in recent years. The chemical water plugging and profile control technology has wide applicability, low cost and flexible operation, and is the preferred method for oilfield production increase at the present stage. There are two main types of cross-linking systems developed in my country for water plugging and profile control: one is organic phenolic cross-linking agents that can interact with amide groups in water-soluble polymer molecules; the other is transition metal organic cross-linking agents. joint agent. Among...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C07D251/70
CPCC07D251/70C09K8/5083C09K8/512
Inventor 孙磊王宇宾徐鸿志张贵清夏烨刘小攀郝志伟赵文娜李玉泉
Owner BC P INC CHINA NAT PETROLEUM CORP
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