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Nitrogen foam gel profile control agent and preparation method and application thereof

A foam gel, nitrogen foam technology, applied in chemical instruments and methods, earthwork drilling, mining fluids, etc., can solve the problems of inability to form glue, unreachable temperature, inapplicability, etc., and achieve good membrane strength and blockage. Good effect and the effect of improving mining efficiency

Active Publication Date: 2018-06-26
PETROCHINA CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The nitrogen foam gel temporary plugging agent provided by the prior art cannot be gelled at 30°C-70°C because the temperature does not meet the conditions for cross-linking reaction, so it is not suitable for medium and low temperature oil reservoirs at 30°C-70°C

Method used

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  • Nitrogen foam gel profile control agent and preparation method and application thereof

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Effect test

preparation example Construction

[0031] In the second aspect, the embodiment of the present invention also provides a method for preparing the above-mentioned nitrogen foam gel temporary plugging agent, the method comprising:

[0032] According to the mass percentage of each component, add polyacrylamide, foaming agent, foam stabilizer, organic chromium crosslinking agent, and water into the reactor and stir evenly, then put the reactor in an oven and let it stand to obtain a gel , and finally feed nitrogen into the gel to obtain a nitrogen foam gel plugging regulator.

[0033] The preparation method of the above-mentioned nitrogen foam gel plugging agent is simple, and the obtained nitrogen foam gel plugging agent has a good plugging effect, can reduce the number of gas cones and steam channeling channels, can improve the extraction efficiency of crude oil, and can be popularized on a large scale use.

[0034] Each component can be dissolved in an appropriate amount of water before mixing and stirring evenly,...

Embodiment 1

[0049] In this example, the plugging effect of the nitrogen foam gel plugging modifier is evaluated. The specific test process is as follows: select a φ250×900 cemented core to conduct the air-tight physical model experiment, first fix the core in the middle of the cylinder, then inject air from the left end of the cylinder, and install a 10L transition container at the other end, and then connect the Air meter, read Q after ventilating at a rate of 20mL per minute for 3 minutes 1 Then inject 3 times the core volume of the mixed solution used to prepare the gel into the core, and then inject nitrogen gas with a volume ratio of 70:1 to the gel into the cylinder, and set the temperature at 40°C Stand still for 10h under certain conditions, inject air from the left end of the cylinder for 3 minutes, and read Q 2 Finally, calculate according to the following formula to obtain the plugging rate of the nitrogen foam gel plugging modifier:

[0050]

[0051] Among them, η is the ...

Embodiment 2

[0055] In this example, the plugging effect of the nitrogen foam gel plugging modifier is evaluated. The specific test process is the same as the process of obtaining the plugging rate of the nitrogen foam gel plugging agent in Example 1, the difference is that it is left standing at 50°C for 9 hours, and then injected into the cylinder with the gel The volume ratio of nitrogen is 80:1, and the mixed solution used to prepare the gel includes: 2kg polyacrylamide, 2kg chromium lactate, 0.5kg sodium alkylbenzene sulfonate, 1kg sodium carboxymethylcellulose, 94.5kg water.

[0056] The test results show that the plugging rate of the above-mentioned nitrogen foam gel plugging modifier is 88%. It can be seen that the nitrogen foam gel plugging agent provided by the embodiment of the present invention can be used to plug gas cones, steam channeling channels or fractures in medium and low temperature oil reservoirs at 30°C-70°C, so as to improve the recovery efficiency of crude oil an...

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Abstract

The invention discloses a nitrogen foam gel profile control agent and a preparation method and application thereof and belongs to the field of oilfield chemistry. The profile control agent comprises afoam gel skeleton and nitrogen gas distributed in the foam gel skeleton. The foam gel skeleton is obtained through feeding nitrogen gas into the gel. The gel is prepared from 1.5%-2.5% by mass of polyacrylamide, 0.3%-1% by mass of a foaming agent, 1%-3% by mass of a foam stabilizer, 1.5%-2.5% by mass of an organic chromium cross-linking agent and the balance of water through a cross-linking reaction. The foam stabilizer comprises sodium carboxymethyl cellulose or soluble starch. A volume ratio of the nitrogen gas to the foam gel skeleton is 70-95: 1. The profile control agent can seal and profile the medium and low temperature oil layers at 30 to 70 DEG C. The nitrogen foam gel skeleton has good membrane strength and good sealing effects and can greatly improve the mining efficiency of the crude oil.

Description

technical field [0001] The invention relates to the field of oil field chemistry, in particular to a nitrogen foam gel plugging regulator and its preparation method and application. Background technique [0002] With the deepening of oil field development, formation energy will continue to decrease, and the extraction of crude oil will decrease. Moreover, due to the incompatibility of oil and water, oil and gas in the oil layer, as well as the heterogeneity of the oil reservoir, the production between the reservoirs, in the reservoir, and on the plane of the reservoir is uneven, so that gas cones appear in the oil layer, or the adjacent oil wells There are steam channels between them, which makes the method of injecting water back into the oil well or adopting the steam huff and puff method cannot greatly improve the recovery efficiency of crude oil, and the interference of gas cones and steam channeling may also cause the oil well to fail to work normally. At present, nitr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/518E21B43/22
CPCC09K8/512C09K8/518E21B43/16
Inventor 苏娜谢刚谢娟李善维高孟祥曹瑞民肖云刘承炜唐建茹李梦瑶
Owner PETROCHINA CO LTD
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