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A composite anti-gas channeling agent for carbon dioxide flooding

A carbon dioxide and anti-gas channeling agent technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as reducing the contact efficiency of carbon dioxide and crude oil, increasing the water saturation of the oil layer, and affecting the performance of foaming and foam stabilization , to achieve broad market application prospects, strong fluidity, and enhanced effects

Active Publication Date: 2022-06-21
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Among them, water-air alternation technology and carbon dioxide foam sealing channeling technology are widely used, and some results have been achieved in mine applications. However, frequent alternate injection of water and air will increase the water saturation of the oil layer and reduce the contact efficiency of carbon dioxide and crude oil. , making it difficult to form a miscible zone, thus reducing the oil displacement efficiency
[0006] The foaming and stabilizing properties of the surfactants used in the carbon dioxide foam technology will be seriously affected under the condition of high temperature and high salinity. In addition, carbon dioxide has a large solubility in formation water, foam and gel, so the carbon dioxide molecules in the above The concentration diffusion in the system is very obvious, resulting in poor blocking effect of carbon dioxide foam, thickened foam, and gel sealing system on carbon dioxide
[0007] However, the precipitation system used in the chemical reaction has disadvantages such as poor injectivity and uncontrollable plugging position in low-permeability reservoirs.

Method used

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  • A composite anti-gas channeling agent for carbon dioxide flooding
  • A composite anti-gas channeling agent for carbon dioxide flooding
  • A composite anti-gas channeling agent for carbon dioxide flooding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] This embodiment provides a composite anti-gas channeling agent for carbon dioxide flooding, and the composition of its raw materials is shown in Table 3.

[0060] table 3

[0061]

[0062] The gel strength of the composite anti-gas channeling agent for carbon dioxide flooding in this example was evaluated, and the results are shown in Table 4.

[0063] Table 4

[0064] time / d 1 7 30 60 90 120 180 strength H H H H H H H

[0065] The anti-gas-channeling performance evaluation test was carried out on the composite anti-gas-channeling agent for carbon dioxide flooding in this embodiment. The injection pressure and the curve are as follows: figure 1 shown. The core plugging rate measurement table is shown in Table 5.

[0066] table 5

[0067] Pore ​​volume / cm 3

Embodiment 2

[0069] The present embodiment provides a composite anti-gas channeling agent for carbon dioxide flooding, the raw material composition of which is shown in Table 6.

[0070] Table 6

[0071]

[0072] The gel strength of the composite anti-gas channeling agent for carbon dioxide flooding in this example was evaluated, and the results are shown in Table 7.

[0073] Table 7

[0074] time / d 1 7 30 60 90 120 180 strength F G H H H H H

[0075] The anti-gas-channeling performance evaluation test was carried out on the composite anti-gas-channeling agent for carbon dioxide flooding in this embodiment. The injection pressure and the curve are as follows: figure 2 shown. The core plugging rate measurement table is shown in Table 8.

[0076] Table 8

[0077] Pore ​​volume / cm 3

Embodiment 3

[0079] The present embodiment provides a composite anti-gas channeling agent for carbon dioxide flooding, the raw material composition of which is shown in Table 9.

[0080] Table 9

[0081]

[0082] The gel strength of the composite anti-gas channeling agent for carbon dioxide flooding in this example was evaluated, and the results are shown in Table 10.

[0083] Table 10

[0084] time / d 1 7 30 60 90 120 180 strength G H H H H H H

[0085] The anti-gas-channeling performance evaluation test was carried out on the composite anti-gas-channeling agent for carbon dioxide flooding in this embodiment. The injection pressure and the curve are as follows: image 3 shown. The core plugging rate measurement table is shown in Table 11.

[0086] Table 11

[0087] Pore ​​volume / cm 3

[0088] The above examples illustrate that the composite anti-gas-channeling agent for carbon dioxide flooding of the present invention has good anti-gas-c...

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Abstract

The invention provides a composite anti-gas channeling agent for carbon dioxide flooding. The raw material composition of the composite anti-gas channeling agent for carbon dioxide flooding includes a polymer gelling agent and a precipitation base fluid; based on the total mass of the polymer gelling agent as 100%, the raw material composition of the polymer gelling agent includes 0.5% ‑1% polyacrylamide, 0.1%‑0.5% organometallic crosslinking agent, 0.5%‑2% resin crosslinking agent, 0.05%‑0.2% stabilizer and the rest simulated formation water; The total mass of the liquid is taken as 100%, and the raw material composition of the precipitation base liquid includes 2%-15% of the precipitation solution and the balance of simulated formation water. The composite anti-gas channeling agent for carbon dioxide flooding of the present invention has a good gas channeling preventing effect.

Description

technical field [0001] The invention relates to an anti-gas-channeling agent, in particular to a composite anti-gas-channeling agent for carbon dioxide flooding, belonging to the technical field of petroleum exploitation. Background technique [0002] Carbon dioxide flooding technology has the advantages of good injection performance, wide application range, low oil displacement cost, and significant enhanced oil recovery in the exploitation of low-permeability oilfields. At the same time, it can also slow down the greenhouse effect caused by carbon dioxide. One of the methods of oil recovery. [0003] However, in the process of carbon dioxide gas flooding, due to the influence of reservoir heterogeneity, poor mobility, density difference and other factors, the gas gradually forms a fingering phenomenon in the formation, which leads to the occurrence of gas channeling. The phenomenon of gas channeling will form an ineffective circulation of gas, resulting in a reduction in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/594
CPCC09K8/594
Inventor 郭继香谷峪张世岭陈冠儒郭瑞雪李玉宛
Owner CHINA UNIV OF PETROLEUM (BEIJING)