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Nano-composite cross-linking agent for fracturing fluid and preparation method of nano-composite cross-linking agent

A nano-composite and cross-linking agent technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of complex liquid preparation and complex components, and achieve simple liquid preparation, simple preparation methods, and easy popularization and use Effect

Active Publication Date: 2021-06-15
延安坤旭石油工程技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a nano-composite cross-linking agent for fracturing fluid in view of the current problem of complex components and complex liquid preparation of the fracturing fluid cross-linking agent, which uses a chelating agent formed by chelating metal ions and nano-carbon quantum dots as a cross-linking agent , its composition is simple, the solution is simple

Method used

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  • Nano-composite cross-linking agent for fracturing fluid and preparation method of nano-composite cross-linking agent
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  • Nano-composite cross-linking agent for fracturing fluid and preparation method of nano-composite cross-linking agent

Examples

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Embodiment 1

[0024] In this example, a nanocomposite cross-linking agent for fracturing fluid was prepared, and its formula in terms of moles was: 5 mol of citric acid, 2.5 mol of diethylenetriamine, 5 mol of zirconium oxychloride, and 2000 mL of deionized water.

[0025] Its specific preparation method is:

[0026] Step 1: Weigh citric acid and diethylenetriamine according to the above formula, add them into deionized water, stir and mix to obtain a mixed solution; heat the mixed solution to 180°C, react for 8 hours, and the reaction is completed to obtain a liquid system of nano-carbon quantum dots ;

[0027] Step 2: Add zirconium oxychloride into the above liquid system according to the above formula, stir to dissolve the zirconium oxychloride completely, and react for 1.5 hours to obtain nano-crosslinking agent A.

Embodiment 2

[0029] In this example, a nanocomposite cross-linking agent for fracturing fluid was prepared, and its formula in terms of moles was: 5 mol of citric acid, 5 mol of ethylenediamine, 25 mol of zirconium oxychloride, and 2000 mL of deionized water.

[0030] Its specific preparation method is:

[0031] Step 1: Weigh citric acid and ethylenediamine according to the above formula, add them into deionized water, stir and mix to obtain a mixed solution; heat the mixed solution to 250° C., react for 4 hours, and the reaction is completed to obtain a liquid system of nano-carbon quantum dots;

[0032] Step 2: Add zirconium oxychloride into the above liquid system according to the above formula, stir to dissolve the zirconium oxychloride completely, and react for 3 hours to obtain nano-crosslinking agent B.

Embodiment 3

[0034] In this example, a nanocomposite cross-linking agent for fracturing fluid was prepared, and its formula in terms of moles was: 5 mol of citric acid, 4 mol of diethylenetriamine, 15 mol of zirconium oxychloride, and 2000 mL of deionized water.

[0035] Its specific preparation method is:

[0036] Step 1: Weigh citric acid and diethylenetriamine according to the above formula, add them into deionized water, stir and mix to obtain a mixed solution; heat the mixed solution to 200°C, react for 5 hours, and the reaction is completed to obtain a liquid system of nano-carbon quantum dots ;

[0037] Step 2: Add zirconium oxychloride into the above liquid system according to the above formula, stir to dissolve the zirconium oxychloride completely, and react for 2 hours to obtain nano-crosslinking agent C.

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Abstract

The invention discloses a nano-composite cross-linking agent for fracturing fluid and a preparation method of the nano-composite cross-linking agent, and relates to the technical field of fracturing fluid for oil and gas development. The cross-linking agent comprises a chelate synthesized by nano carbon quantum dots and metal ions. The invention further discloses the preparation method of the nano composite cross-linking agent for the fracturing fluid. The method comprises the following steps: step 1, preparing the nano carbon quantum dots; and step 2, adding inorganic salt of metal ions into the prepared nano carbon quantum dots, and performing reacting for 1.5-3 hours to obtain the nano cross-linking agent. The chelate formed by chelating the nano carbon quantum dots and the metal ions is adopted as the composite cross-linking agent, and the problems that existing fracturing fluid cross-linking agents are complex in component and complex in fluid preparation are solved. One carbon quantum dot of the cross-linking agent has a plurality of cross-linking points, so that more guanidine gum molecular chains can be cross-linked under the same addition amount; and the dispersity is better, and the carbon quantum dots have a reinforcing effect on the fracturing fluid, so that the guanidine gum fracturing fluid which is cross-linked by the cross-linking agent has a better temperature-resistant effect compared with existing cross-linking agents, and the temperature resistance can reach 180-200 DEG C.

Description

technical field [0001] The invention belongs to the technical field of fracturing fluid for oil and gas development, and in particular relates to a nanocomposite crosslinking agent for fracturing fluid and a preparation method thereof. Background technique [0002] Fracturing is an engineering process of oil and gas exploitation. It is a process of using pressure equipment to press a liquid with a certain viscosity into cracks in underground rocks under high pressure. The liquid with viscosity used in the fracturing process is pressure. fissure fluid. The fracturing fluid enters the formation rock under high pressure, causing the rock to break and cracks appear. Adding proppant materials to the fracturing fluid can support the opening state of the underground fractures, so that an obvious tension line is formed after the pumping of the fracturing fluid is stopped. Open rock fractures, improve the permeability of oil and gas layers, and increase the flow or production of oil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/685C09K8/905C09K8/887
Inventor 张太亮郑存川杨龙闫朝宗扶浩然
Owner 延安坤旭石油工程技术服务有限公司
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