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Chemical tracer agent for fracturing as well as preparation method and application thereof

A chemical tracer and tracer technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of large adsorption capacity and low detection degree

Pending Publication Date: 2021-05-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing chemical tracers have limitations due to their large adsorption on the formation surface and low detection.

Method used

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  • Chemical tracer agent for fracturing as well as preparation method and application thereof
  • Chemical tracer agent for fracturing as well as preparation method and application thereof
  • Chemical tracer agent for fracturing as well as preparation method and application thereof

Examples

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preparation example Construction

[0017] A preparation method of a chemical tracer for fracturing, using p-chlorofluoromethylbenzene as a starting material, comprising the steps of:

[0018] (1) Preparation of Fluoromethyl Benzene Grignard Reagent

[0019] In the presence of an initiator, p-chlorofluoromethylbenzene is subjected to Grignard reaction with magnesium scraps and anhydrous lithium chloride in a tetrahydrofuran solvent to obtain a fluoromethylbenzene Grignard reagent;

[0020] The initiator is iodine, methyl iodide, ethyl iodide or 1,2-dibromoethane;

[0021] Described p-chlorofluoromethylbenzene is p-chlorotrifluoromethylbenzene, p-chlorodifluoromethylbenzene or p-chloromonofluoromethylbenzene;

[0022] (2) Preparation of fluoromethyl benzoate

[0023] In a toluene solvent, the fluoromethyl benzine Grignard reagent is reacted with an electrophile to prepare fluoromethyl benzoate;

[0024] The electrophile is methyl chloroformate, ethyl chloroformate, dimethyl carbonate or diethyl carbonate;

[...

Embodiment approach

[0037] According to the present invention, a preferred embodiment is as follows:

[0038] A preparation method of a chemical tracer for fracturing, the steps are as follows:

[0039] (1) Preparation of Fluoromethyl Benzene Grignard Reagent

[0040] Add magnesium chips and anhydrous lithium chloride to a 250mL three-necked bottle, fill with nitrogen to remove oxygen in the bottle, slowly add p-chlorotrifluoromethylbenzene and Grignard reaction initiator fully mixed with tetrahydrofuran dropwise at 55°C, and react to After the magnesium chips are completely consumed, the heating is stopped, and the solution is cooled to room temperature to obtain a dark brown solution, that is, fluoromethylbenzene Grignard reagent;

[0041] (2) Preparation of fluoromethyl benzoate

[0042] Add electrophilic reagent and toluene into a 250mL three-necked flask, stir in an ice bath until fully mixed, slowly add fluoromethyl benzene Grignard reagent dropwise, react at 20 °C for 6 h, cool in a wate...

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Abstract

The invention relates to a chemical tracer for fracturing and a preparation method and application thereof. The chemical tracer agent is fluoromethyl benzoic acid. The preparation method of the chemical tracer takes p-chlorofluoromethyl benzene as an initial raw material, and comprises a preparation step of a fluoromethyl benzene Grignard reagent, a preparation step of fluoromethyl benzoate and a preparation step of fluoromethyl benzoic acid. The invention further provides application of p-fluoromethyl benzoic acid as a chemical tracer in oil exploitation, trace detection can be realized, and the detection precision is improved.

Description

technical field [0001] The invention relates to a chemical tracer for fracturing, a preparation method and application thereof, and belongs to the technical field of chemical tracers for petroleum exploitation. Background technique [0002] Tracer monitoring technology is one of the most widely used dynamic monitoring technologies in oil fields. The mechanism is that when the well is not shut in, the tracer enters the reservoir with the working fluid and carries the fluid out, so as to explain the connection between the injection and production wells, the sweeping parameters of the injected fluid, and the injection and production flow lines. With the development of technology, tracer monitoring technology has achieved remarkable results in the dynamic monitoring of fracturing process. By monitoring the production of tracers in the flowback fluid after fracturing, the tracer monitoring technology can evaluate the development of fracturing fractures, and then analyze the pros...

Claims

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Application Information

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IPC IPC(8): C07C63/70C07F3/02C07C67/343C07C69/76C07C51/09E21B47/11E21B43/26
CPCC07C63/70C07F3/02C07C67/343C07C51/09E21B43/26C07C69/76
Inventor 王彦玲孟令韬史文静兰金城蒋保洋许宁
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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