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Low-temperature expandable graphite for sealing channeling by steam injection in heavy oil reservoirs and its preparation method and application

A technology for expanded graphite and heavy oil reservoirs, applied in chemical instruments and methods, earthwork drilling, sealing/sealing, etc. Low construction cost, simple preparation method and good chemical stability

Active Publication Date: 2022-02-22
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 for sealing channeling by steam injection in heavy oil reservoirs and its preparation method and application
  • Low-temperature expandable graphite for sealing channeling by steam injection in heavy oil reservoirs and its preparation method and application
  • Low-temperature expandable graphite for sealing channeling by steam injection in heavy oil reservoirs and its preparation method and application

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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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PUM

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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 sealing channeling in heavy oil reservoirs, a preparation method and application thereof. The method for preparing low-temperature expandable graphite is characterized in that the method comprises: performing a contact reaction on a compound represented by formula (1), an oxidizing agent, an acid, an alkali metal salt and graphite. The low-temperature expandable graphite system has a high expansion rate and good thermal stability, and can be carried into the formation, and the graphite itself is flexible, which can improve the effect of steam sealing and increase the effective life of the sealing agent, reducing the processing cost. Realize efficient output of crude oil.

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 Patents(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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