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Low-temperature expandable graphite system for profile control and water plugging in deep reservoirs, its preparation method and application

A multi-component composite and expanded graphite technology, which is applied in the direction of graphite, chemical instruments and methods, carbon compounds, etc., can solve problems such as deep profile control and water shutoff in ultra-deep reservoirs, and achieve good compatibility, good compatibility, and preparation The effect of simple method

Active Publication Date: 2021-08-24
CHINA UNIV OF PETROLEUM (EAST CHINA) +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It cannot expand under the conditions of ultra-deep reservoirs, and it is difficult to realize deep profile control and water shutoff in ultra-deep reservoirs

Method used

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  • Low-temperature expandable graphite system for profile control and water plugging in deep reservoirs, its preparation method and application
  • Low-temperature expandable graphite system for profile control and water plugging in deep reservoirs, its preparation method and application
  • Low-temperature expandable graphite system for profile control and water plugging in deep reservoirs, its preparation method and application

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preparation example Construction

[0029] The second aspect of the present invention provides a method for preparing a multi-component composite intercalation low-temperature expandable graphite system, the method comprising: using the above composition for composite intercalation to intercalate graphite.

[0030] According to the present invention, intercalation treatment of graphite by using the above-mentioned composition for intercalation of element composite can make graphite have better expansion properties, etc., in order to obtain a low-temperature expandable graphite system with better water blocking performance, preferably, relative to 100 Graphite is used in an amount of 300-600 parts by weight, for example, 300-400 parts by weight, in terms of inorganic acid. Among them, the graphite is preferably flake graphite, especially flake graphite with a particle size of 100-180 μm.

[0031]Although graphite is treated with the composition for intercalation of the above-mentioned elemental composite intercal...

Embodiment 1

[0056] This example is used to illustrate the low-temperature expandable graphite system of the present invention and its preparation method.

[0057] (1) the nitric acid solution of the potassium permanganate of 300 weight parts (the weight ratio of potassium permanganate and nitric acid is 1:30; Nitric acid is 67 weight % concentrated nitric acid) and the natural flake graphite particle of 100 weight parts (purchased from Qingdao Graphite Co., Ltd. (natural flake graphite particles with a particle size of 150 μm) were stirred and mixed, and placed in an ultrasonic reaction at 30° C. for 45 minutes to obtain a pre-oxidized graphite system.

[0058] (2) the inorganic acid (the concentrated sulfuric acid and perchloric acid weight ratio of 400 weight parts is 1:3; The concentrated sulfuric acid concentration is 98% by weight; The concentration of perchloric acid is 72% by weight) joins in the pre-oxidized graphite system, Stir and react at 30°C for 80 minutes to obtain an inorg...

Embodiment 2

[0062] This example is used to illustrate the low-temperature expandable graphite system of the present invention and its preparation method.

[0063] According to the method described in embodiment 1, wherein, the difference is that the shearing conditions in step (4) include: jet mill parameters 40Hz, fan outlet 1.0, cyclic shearing for 3 minutes, to obtain a multi-component composite insert with an average particle size of 40 μm layer of low temperature expandable graphite system G1-2.

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Abstract

The invention relates to the field of oil field chemistry, in particular to a low-temperature expandable graphite system for profile control and water plugging in deep oil reservoirs, a multi-component composite intercalation system, a preparation method and application thereof. The low-temperature expandable graphite system of multi-component composite intercalation is obtained by intercalating graphite with a composition for multi-component composite intercalation, wherein the composition for multi-component composite intercalation contains inorganic acid, organic acid and intercalation enhancer, Wherein, the intercalation enhancer contains alkali metal halides and cationic surfactants. The graphite system can expand at 130-200°C, and has a salt tolerance of 100,000-300,000 mg / l. It has the characteristics of high expansion multiple and long-term stability, and can realize long-term profile control and water shutoff in ultra-deep reservoirs.

Description

technical field [0001] The invention relates to the field of oil field chemistry, in particular to a low-temperature expandable graphite system for profile control and water plugging in deep oil reservoirs, a multi-component composite intercalation system, a preparation method and application thereof. Background technique [0002] Deep oil and gas resources are an important replacement field for the development of oil and gas resources in the future. Water injection and gas injection are important measures for the development of such deep reservoirs, but long-term water injection or gas injection will increase the heterogeneity of the reservoir, and channeling is prone to occur, resulting in a rapid increase in water cut in oil wells and a decline in development level. Profile control and water shutoff in ultra-deep reservoirs is an important technology to improve the development effect of water injection or gas injection. Currently developed plugging agents such as polymer ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/22C09K8/506
CPCC09K8/506C09K2208/34C01B32/22C04B14/024C09K8/426C01B32/225C01P2004/61C01B32/23
Inventor 赵光戴彩丽吕亚慧由庆胡广杰何龙刘佳伟王森李亮孙宁
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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