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Three-phase self-foaming water-plugging agent

A technology of water blocking agent and foaming agent, which is applied in the field of three-phase self-generated foam water blocking agent, which can solve the problems of poor foam stability, poor foaming effect, and low bubble efficiency, and achieve stable gel performance, convenient construction, and oil layer small damage effect

Active Publication Date: 2015-09-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main components of two-phase and three-phase foams are blowing agents and foam stabilizers. The preparation process is simple, but the foam stability is poor, and gas channeling is prone to occur.
Although the configuration of this method has uniform foam, it requires a lot of equipment, high cost, high friction, and high injection pressure; in addition, by injecting the foaming agent first and adopting the underground foaming method, the foaming efficiency is low and the foaming effect is poor

Method used

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  • Three-phase self-foaming water-plugging agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In this embodiment, a three-phase self-generating foam water blocking agent includes the following components: by mass percentage, solid particles 2.0%, foaming agent 0.2%, foam stabilizer 0.2%, crosslinking agent 0.02%, retarder 0.02%, gas generating agent 3%, dispersant 2.0%, PH regulator 0.1%, and the balance is water.

[0047] Wherein, the solid particles are attapulgite, the foaming agent is a mixture of sodium dodecylbenzenesulfonate and fatty alcohol polyoxyethylene ether sodium sulfate in a weight ratio of 1:3, and the foam stabilizer has an average molecular weight of 1 ~×10 6 The polyacrylamide, the crosslinking agent is potassium dichromate, the retarder is sodium thiosulfate, the gas generating agent is a mixture of ammonium dichromate and sodium sulfite in a weight ratio of 1:1, and the dispersant is calcium lignosulfonate. The pH regulator is sodium acetate.

Embodiment 2～9

[0049] Same as Example 1, the difference lies in: the mass percentage content of each component included in the water shutoff agent is different, and the balance is water, see Table 1 for details.

Embodiment 10-12

[0051] Same as Example 1, the difference is that the attapulgite as a solid particle is replaced by bentonite, the mass percentage content of each component included in the water shutoff agent is different, and the balance is water, see Table 1 for details.

[0052] Table 1

[0053]

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Abstract

The invention discloses a three-phase self-foaming water-plugging agent, and belongs to the field of petroleum chemistry. The provided water-plugging agent comprises the following components: solid particles, a foaming agent, a foam stabilizing agent, a crosslinking agent, a delaying agent, and a gas producing agent. Compared with the prior art, the provided water-plugging agent has the advantages of high foam quality and good stability, the gel crosslinking and gas production can be achieved at the same time, the water-plugging agent can tolerate high temperature, has a strong residue blocking performance and a long water-plugging period, and can achieve efficient plugging and depth profile control. Moreover, the preparation technology of the provided water-plugging agent is simple, the injection cost is low, and the water-plugging agent is safe and reliable, thus has a good market prospect and high economic value, and is especially suitable for the development of high temperature heavy oil steam stimulation wells.

Description

technical field [0001] The invention belongs to the field of petrochemistry, and in particular relates to a three-phase self-generating foam water blocking agent. Background technique [0002] Water production from oil and gas wells is a common problem in oilfield development, especially in the late stage of water injection development. Due to the heterogeneity of the formation, the water cut in the oilfield rises rapidly, the oil layer is flooded prematurely, and the production declines. At present, due to the nearly 40 years of water injection development in my country, major oil fields have entered a period of high water cut, and the efficiency of production and injection measures widely used under the original water injection conditions is getting lower and lower, and the water production has increased significantly, with poor economic benefits. With the continuous increase of water content, more and more attention is paid to the technology of profile control and water s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/518
CPCC09K8/512C09K8/518
Inventor 张大年赵梦云苏长明张汝生龙秋莲史爱萍张锁兵郑承纲
Owner CHINA PETROLEUM & CHEM CORP
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