High temperature resistant organic zirconium crosslinking agent and preparation method thereof, a fracturing fluid jelly and preparation method thereof

A zirconium crosslinking agent, high temperature resistant technology, applied in the field of oil drilling, can solve the problems affecting the performance of the crosslinking agent, fast crosslinking speed, low solubility, etc., to achieve delayed crosslinking performance, stable jelly performance, and good effect Effect

Active Publication Date: 2017-08-01
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Delayed crosslinking is mainly realized by ligands formed by polyols and borates, but ordinary complex ligands are less stable, and the coordination reaction itself is a reversible reaction, resulting in crosslinking too fast
③Poor stability
Due to the low solubility of borate in water, turbid precipitation occurs after standing for a long time, which affects the performance of the crosslinking agent

Method used

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  • High temperature resistant organic zirconium crosslinking agent and preparation method thereof, a fracturing fluid jelly and preparation method thereof
  • High temperature resistant organic zirconium crosslinking agent and preparation method thereof, a fracturing fluid jelly and preparation method thereof
  • High temperature resistant organic zirconium crosslinking agent and preparation method thereof, a fracturing fluid jelly and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The mass percentage of each reaction raw material is water: glycerol: zirconium oxychloride: sodium hydroxide: lactic acid: sodium gluconate: N, N ~ methylenebisacrylamide: butyl phosphate = 50:15:5: 15:5:3:2:5.

[0037] (1) First add water into the reactor, and adjust the temperature of the reactor to 55°C, then add the solvent glycerol while stirring, and stir for 0.5h;

[0038] (2) Keep the temperature of the reaction kettle constant, add zirconium oxychloride into the kettle, stir to make it fully dissolved in the solvent, add NaOH to adjust the pH value to 8, and hydrolyze for 1 hour;

[0039] (3) After all the raw materials in the reactor are dissolved, adjust the temperature of the reactor to 80°C, add ligand lactic acid, sodium gluconate and cross-linking agent N,N-methylenebisacrylamide into the solution, and stir until completely Dissolve and heat complexation reaction for 2.5h;

[0040] (4) Raise the temperature of the reaction kettle to 90° C., add the hig...

Embodiment 2

[0042] The mass ratio of each reaction raw material: water: ethylene glycol: zirconium tetrachloride: sodium hydroxide: triethanolamine: sodium gluconate: N, N ~ methylene bisacrylamide: butyl triester phosphate: potassium chloride is 40 :15:6:18:3:5:5:4:4.

[0043] (1) First add water to the reactor, and adjust the temperature of the reactor to 60°C, then add the solvent ethylene glycol while stirring, and stir for 1 hour;

[0044] (2) The temperature of the reaction kettle remains constant, and zirconium tetrachloride is added in the kettle, stirred to make it fully dissolved in the solvent, and NaOH is added to adjust the pH value to be 7.5, and the hydrolysis reaction is 0.5h;

[0045] (3) After all the raw materials in the reactor are dissolved, adjust the temperature of the reactor to 75°C, add the ligand triethanolamine, sodium gluconate and cross-linking agent N,N-methylenebisacrylamide into the solution, and stir until Dissolve completely, heat complexation reaction ...

Embodiment 3

[0048] The mass percent of each reaction raw material is water: mannitol: zirconium tetrachloride: sodium hydroxide: bishydroxyethylglycine: sodium gluconate: N, N-methylenebisacrylamide: sodium thiosulfate=45:15 :7:20:3:5:3:2.

[0049] (1) First add water into the reactor, and adjust the temperature of the reactor to 50°C, then add the solvent mannitol while stirring, and stir for 1 hour;

[0050] (2) The temperature of the reaction kettle remains constant, and zirconium tetrachloride is added in the kettle, stirred to make it be fully dissolved in the solvent, and NaOH is added to adjust the pH value to be 8.5, and the hydrolysis reaction is 0.5h;

[0051] (3) After all the raw materials in the reactor are dissolved, adjust the temperature of the reactor to 70°C, and add ligand bishydroxyethylglycine, sodium gluconate and cross-linking agent N,N-methylenebisacrylamide to the solution , stirred until completely dissolved, and heated for complexation reaction for 2.5h;

[00...

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Abstract

The invention discloses a high temperature resistant organic zirconium crosslinking agent and a preparation method thereof. The crosslinking agent is prepared from an inorganic zirconium salt 5%-10%, a polyhydric alcohol 5%-15%, sodium hydroxide 10%-20%, an organic ligand 5%-10%, a complex crosslinking agent 1%-5%, and a heat temperature stabilizer 1%-5% in a water solution. The invention also discloses a fracturing fluid gel prepared from the high temperature resistant organic zirconium crosslinking agent and its preparation method. The fracturing fluid gel is prepared from the high temperature resistant organic zirconium crosslinking agent 0.15%-0.45%, a polyacrylamide thickener 0.3%-0.6%, potassium chloride 0.5%-1%, a temperature stabilizer 0.1%-0.3%, a cleanup additive 0.8%-1.5% and an anti-swelling agent 1.5%-2% with water as a solvent. The high temperature resistant organic zirconium crosslinking agent is suitable for fracturing transformation of an oil reservoir with main characteristics of deep layer, high temperature and low permeability, not only can obviously improve temperature resistance and shearing resistance of a fracturing fluid gel system, but also has a crosslinking delaying performance. And the fracturing fluid gel formed by crosslinking at a temperature of 180-200 DEG C with the polyacrylamide is stable in gel performances, good in temperature resistance and shear resistance, good in hydraulic fracturing effect, and can meet fracturing operation requirements.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling, and in particular relates to a high-temperature-resistant organic zirconium crosslinking agent and a preparation method thereof, as well as a fracturing fluid jelly and a preparation method thereof. Background technique [0002] As early as the 1980s, the fracturing fluid jelly formulated with organic boron cross-linking agent had the characteristics of smooth flow, strong sand-carrying ability, good shear recovery, delayed cross-linking, easy on-site preparation, and low product price. Therefore, it has been widely used in hydraulic fracturing. [0003] However, in recent years, in the fracturing of reservoirs characterized by deep layers, high temperature, and low permeability, the disadvantages of organoboron crosslinking agents have gradually been exposed, mainly in three aspects: ① Poor temperature resistance. The temperature resistance of organoboron crosslinking agents used abr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/685C09K8/882C09K8/887C09K2208/12
Inventor 刘音牛增前常青何志勇
Owner BC P INC CHINA NAT PETROLEUM CORP
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