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Low-temperature expandable graphite suitable for steam injection channeling sealing of heavy oil reservoirs and preparation method and application of low-temperature expandable graphite

A technology for expanded graphite and heavy oil reservoirs, applied in chemical instruments and methods, earth drilling, sealing/isolation, etc., can solve problems such as poor sealing and channeling effects, high formation temperature, and short curing time, and achieve raw material And the effect of low construction cost, good chemical stability, and low construction risk

Active Publication Date: 2020-05-22
CHINA UNIV OF PETROLEUM (EAST CHINA) +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Jelly gels quickly under high temperature conditions and is prone to aging and dehydration, the plugging strength decreases, and it is difficult to achieve deep formation control
Moreover, the gelling fluid is sheared by the screen, perforation holes, and formation pores during the injection process, and the gelling performance also decreases.
The foam is unstable at high temperature, easy to defoam, and the sealing effect is affected
During steam flooding / steam huff and puff production, the formation temperature is high (150-350°C). If gel or foam sealing agent is to be used, the formation needs to be cold treated (well shut down for a long time or cold water injection), which is a waste of time. increase development costs
Inorganic rigid particles (ultrafine cement, clay, etc.) have poor injectability and migration in the formation, and are easy to deposit on the wellbore wall or near the wellbore during the injection process, and are sensitive to temperature, and the curing time is short at high temperatures. Therefore, a certain engineering risk is caused to the construction, and the sealing effect is not good.

Method used

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  • Low-temperature expandable graphite suitable for steam injection channeling sealing of heavy oil reservoirs and preparation method and application of low-temperature expandable graphite
  • Low-temperature expandable graphite suitable for steam injection channeling sealing of heavy oil reservoirs and preparation method and application of low-temperature expandable graphite
  • Low-temperature expandable graphite suitable for steam injection channeling sealing of heavy oil reservoirs and preparation method and application of low-temperature expandable graphite

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preparation example Construction

[0025] One aspect of the present invention provides a method for preparing low-temperature expandable graphite suitable for steam injection sealing channeling in heavy oil reservoirs, the method comprising: in an aqueous solvent, the compound represented by formula (1), oxidant, acid, Contact reaction between metal salt and graphite;

[0026] Formula 1)

[0027] L is a link or a C1-C4 alkylene group; M is hydrogen or a metal ion.

[0028] According to the present invention, by using the compound represented by formula (1) of the present invention, oxidizing agent, acid and alkali metal salt to treat graphite, graphite can be fully intercalated to obtain a highly expandable graphite system at a lower temperature, It should be understood that the compounds represented by formula (1), oxidants, acids and alkali metal salts in the present invention are intercalants for graphite.

[0029] According to the present invention, in order to make intercalants have a better coordinati...

Embodiment 1

[0060] This example is used to illustrate the low-temperature expandable graphite of the present invention and its preparation method.

[0061] (1) An aqueous solution containing sulfamic acid and potassium permanganate (the content of sulfamic acid is 5g, the content of potassium permanganate is 1g, and the amount of water is 30g) and 10g flake graphite (purchased from Qingdao Hengrunda Graphite Products Co., Ltd.’s 60-mesh flake graphite) was stirred and mixed for 5 minutes, then placed at 40° C. for ultrasonic reaction for 30 minutes, then taken out, and the reaction waste liquid was separated by suction filtration, and the remainder was graphite after the first contact reaction;

[0062] (2) the perchloric acid dispersion liquid containing sodium nitrate (sodium nitrate content is 4g; What perchloric acid adopts is that concentration is the concentrated perchloric acid of 72% by weight, and its consumption is 30g) with the graphite after the first contact reaction Stir and...

Embodiment 2

[0065] This example is used to illustrate the low-temperature expandable graphite of the present invention and its preparation method.

[0066] According to the method described in Example 1, the difference is that in step (1), in the aqueous solution containing sulfamic acid and potassium permanganate, the content of sulfamic acid is 8g, and the content of potassium permanganate is 2g, water The consumption is 25g; The finally obtained particle diameter is the expandable graphite G2 of 60.1 μ m; Wherein, step (3) process has also measured the variation curve of graphite particle diameter with shearing time under 20Hz colloid mill shearing condition, as Figure 4 shown.

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Abstract

The invention relates to the field of oilfield chemistry, in particular to low-temperature expandable graphite suitable for steam injection channeling sealing of heavy oil reservoirs and a preparationmethod and application of the low-temperature expandable graphite. The preparation method of the low-temperature expandable graphite is characterized by comprising the step of carrying out a contactreaction on a compound shown in a formula (1), an oxidant, acid, alkali metal salt and graphite. The low-temperature expandable graphite system has the advantages of being high in expansion rate, goodin thermal stability, capable of being carried into a stratum and flexible in graphite, the steam channeling sealing effect can be improved, the effective service life of a channeling sealing agent can be prolonged, the treatment cost can be reduced, and efficient production of crude oil can be achieved.

Description

technical field [0001] The invention relates to the field of oil field chemistry, in particular to a low-temperature expandable graphite for sealing channeling by steam injection in heavy oil reservoirs and a preparation method and application thereof. Background technique [0002] Thermal oil recovery is the main method used in heavy oil recovery, and steam flooding and steam stimulation are two commonly used thermal recovery methods. After long-term steam treatment in the formation, it is easy to form a dominant steam percolation channel, so that the injected steam can channel along this channel, the remaining oil cannot be effectively swept, and energy is wasted. Therefore, steam channeling is a problem that must be solved in the process of steam flooding / steam stimulation. [0003] At present, the channeling agents used for steam channeling mainly include high-temperature jelly, high-temperature foam and inorganic rigid particles. The jelly-type channeling agent functi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B33/12C01B32/225
CPCE21B43/24E21B33/12C01B32/225
Inventor 戴彩丽赵光谷成林范喜群宋清新单朝晖赵长喜赵文勋吕亚慧李琳
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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