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Preparation method of metal chelate and high-temperature polymer fracturing fluid

A technology of metal chelates and polymers, applied in the direction of 4/14 organic compounds without C-metal bonds, titanium organic compounds, drilling compositions, etc., to achieve the effect of low fluid loss

Active Publication Date: 2021-07-16
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The temperature resistance of this fracturing fluid can reach about 200°C, but it has no effect of delaying crosslinking

Method used

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  • Preparation method of metal chelate and high-temperature polymer fracturing fluid
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  • Preparation method of metal chelate and high-temperature polymer fracturing fluid

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[0033] The invention provides a kind of preparation method of metal chelate, comprises the following steps:

[0034] Perform chelation reaction of high-valent metal substances and ligand substances in water to obtain metal chelates;

[0035] The metal in the high-valent metal substance is zirconium and / or titanium, and the ligand substance includes a weak coordination substance and a strong coordination substance, the weak coordination substance is polyol and / or polyol amine, and the strong coordination substance The substances are organic acids and / or organic acid salts.

[0036] The metal chelate compound prepared by the invention can be used as a crosslinking agent, which is beneficial to improving the high temperature resistance of the fracturing fluid system, realizing delayed crosslinking under high temperature conditions, and effectively reducing pipeline friction.

[0037] In the embodiment of the present invention, the high-valent metal substance and the ligand subst...

Embodiment 1

[0062] Mix high-valent metal substances (zirconium acetate: titanium tetrachloride = 3:1 mass ratio), lactic acid, ethylene glycol, and triethanolamine in water at a mass ratio of 1:1.5:1:1.5, heat and react to obtain metal chelate compound cross-linking agent; the heating temperature is 50°C and the time is 0.5h, and the reaction temperature is 65°C and the time is 2h.

Embodiment 2

[0064] Mix high-valent metal substances (zirconium sulfate: titanium tetrachloride = 3:1 mass ratio), lactic acid, and triethanolamine in water at a mass ratio of 1:1.5:2, heat and react to obtain a metal chelate crosslinking agent; The heating temperature is 55° C. and the time is 0.5 h, and the reaction temperature is 75° C. and the time is 1.5 h.

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Abstract

The invention provides a preparation method of a metal chelate and a high-temperature polymer fracturing fluid, and the method comprises the following steps: carrying out chelation reaction on a high-valence metal substance and a ligand substance in water to obtain the metal chelate, wherein metal in the high-valence metal substance is zirconium and / or titanium, the ligand substance comprises a weak coordination substance and a strong coordination substance, the weak coordination substance is polyhydric alcohol and / or polyhydric alcohol amine, and the strong coordination substance is organic acid and / or organic acid salt. The high-temperature polymer fracturing fluid provided by the invention mainly comprises a polymer thickening agent, the metal chelate cross-linking agent, a cleanup additive, a clay stabilizer and a demulsifying agent, and can still realize the effect of delaying cross-linking under a high-temperature condition. The fracturing fluid has the advantages of high temperature resistance, shearing resistance, temperature control crosslinking, low friction resistance, low filtration loss and the like, is suitable for fracturing transformation of ultra-high-temperature deep well reservoirs, and solves the problems of high viscosity and high friction resistance of a tubular column temperature control fracturing fluid in ultra-deep and ultra-high-temperature well fracturing large-displacement construction.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir fracturing stimulation, in particular to a preparation method of a metal chelate and a high-temperature polymer fracturing fluid. Background technique [0002] In recent years, with the world's increasing demand for energy and the advancement of exploration technology, the development of oil and gas resources has continued to develop in depth. The reservoir faced by fracturing construction is getting deeper and deeper, and the reservoir temperature is getting higher and higher. With the increasing number of ultra-deep (>6000m) and ultra-high temperature (>200°C) wells, reservoir characteristics and fracturing process characteristics put forward higher requirements for fracturing fluid performance. The formation temperature is high, requiring the fracturing fluid to have excellent temperature resistance; the reservoir is buried deep, and the fracturing fluid can only reach the ...

Claims

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Application Information

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IPC IPC(8): C07F7/00C07F7/28C09K8/68C09K8/88
CPCC07F7/003C09K8/685C09K8/882C09K8/887
Inventor 范明福肖兵郭粉娟胡娅娅宋永芳邱伟
Owner 中石化石油工程技术服务有限公司
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