Compound type 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 oil layers, and affecting foaming and foam stabilizing performance , to achieve the effect of broad market application prospects, strong fluidity and strong migration ability

Active Publication Date: 2017-08-01
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

Method used

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  • Compound type anti-gas-channeling agent for carbon-dioxide flooding
  • Compound type anti-gas-channeling agent for carbon-dioxide flooding
  • Compound type anti-gas-channeling agent for carbon-dioxide flooding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] This example provides a composite anti-gas channeling agent for carbon dioxide flooding, and its raw material composition 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 composite anti-gas channeling agent for carbon dioxide flooding in this example was tested for anti-gas channeling performance, and the injection pressure and the curve were 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] This example provides a composite anti-gas channeling agent for carbon dioxide flooding, and its raw material composition 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 composite anti-gas channeling agent for carbon dioxide flooding in this example was tested for anti-gas channeling performance, and the injection pressure and the curve were as follows: figure 2 shown. Table 8 shows the core plugging rate measurement table.

[0076] Table 8

[0077] Pore ​​volume / cm 3

Embodiment 3

[0079] This example provides a composite anti-gas channeling agent for carbon dioxide flooding, and its raw material composition 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 composite anti-gas channeling agent for carbon dioxide flooding in this example was tested for anti-gas channeling performance, and the injection pressure and the curve were as follows: image 3 shown. Table 11 shows the measurement table of core plugging rate.

[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 gas channeling prevention effect, high plugging ra...

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Abstract

The invention provides a compound type anti-gas-channeling agent for carbon-dioxide flooding. The compound type anti-gas-channeling agent for carbon-dioxide flooding is prepared from the following raw materials: polymer gel and precipitate base fluid; on the basis that the total mass of the polymer gel is 100%, the polymer gel is prepared from the following raw materials: 0.5-1% of polyacrylamide, 0.1-0.5% of an organic metal crosslinking agent, 0.5-2% of a resin crosslinking agent, 0.05-0.2% of a stabilizing agent and the balance of simulation formation water; on the basis that the total mass of the precipitate base fluid is 100%, the precipitate base fluid is prepared from the following raw materials: 2-15% of a precipitation solution and the balance of simulation formation water. The compound type anti-gas-channeling agent for carbon-dioxide flooding is good in anti-gas-channeling effect.

Description

technical field [0001] The invention relates to an anti-gas channeling agent, in particular to a composite type anti-gas channeling agent for carbon dioxide flooding, and belongs 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 recovery in low-permeability oilfield development. At the same time, it can also slow down the greenhouse effect caused by carbon dioxide. Therefore, carbon dioxide flooding technology has become an important global One of the oil recovery methods. [0003] However, in the process of carbon dioxide gas flooding, due to the influence of reservoir heterogeneity, mobility difference, density difference and other factors, the gas gradually forms a fingering phenomenon in the formation, which leads to the occurrence of gas channeling. The gas channeling phenomenon wi...

Claims

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Application Information

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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)
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