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Carbon dioxide foam stabilizer suitable for low-permeability oil deposit

A foam stabilizer and carbon dioxide technology, applied in the field of foam stabilizers, can solve the problems of affecting foam stability, unsatisfactory amplitude, poor shear resistance and high temperature resistance of polymers, etc. Good cut, cost-effective effect

Active Publication Date: 2010-01-06
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, conventional foam stabilizers are mainly polymers. The addition of polymers prolongs the half-life of foams to a certain extent, but the range is not ideal. At the same time, polymers have poor shear and high temperature resistance, which seriously affects the stability of foams. sex

Method used

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  • Carbon dioxide foam stabilizer suitable for low-permeability oil deposit
  • Carbon dioxide foam stabilizer suitable for low-permeability oil deposit
  • Carbon dioxide foam stabilizer suitable for low-permeability oil deposit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1, stirring method measure the foam stabilizing performance of foam stabilizer: in order to further strengthen the stability of foam, carried out foam stabilizer measurement experiment, whipping agent GP (sodium dodecylbenzene sulfonate) use mass concentration is 0.9 %, test environment PH=3, the mass concentration that foam stabilizer (by mass ratio 4:1:1 is made up of modified guar gum, hydroxyethyl cellulose, lauryl alcohol) uses is 0.6%, when measuring, 100ml Pour the prepared solution into a transparent measuring cup with a stirrer and scale, stir at high speed (3000 rpm) for 60s, record the foam volume and the time when half the liquid volume is separated from the foam and the time when the foam is reduced to half, the former Indicates foaming ability (foaming volume), and the latter two represent foam stability (half-life). The experimental results are shown in Table 1.

[0013] Foaming volume and half-life of foaming agent Table 1

[0014] ...

Embodiment 2

[0017] Implementation example 2, in the preferred experiment of foam stabilizer, draw through comparative analysis, modified guar gum, hydroxyethyl cellulose, lauryl alcohol are more effective after compounding, and the ratio of its mass is 4: 1: 1 works best. In the stabilizer concentration test, foaming agent GP (sodium dodecylbenzenesulfonate) use concentration is 0.9%, when test environment PH=3, foam stabilizer (represented by modified guar gum, hydroxyethyl cellulose , lauryl alcohol is formed by mass ratio 4: 1: 1) when the mass concentration is 0.6%, the comprehensive effect of all aspects is the best, and the experimental results are shown in figure 1 .

Embodiment 3

[0018] Example 3. Performance evaluation of the foam profile control system: The water samples of the No. 8 Oil Production Plant were taken, and the foam profile control system was prepared with the foam stabilizer of the present invention. The experimental results are shown in Table 2 below:

[0019] Comprehensive performance table of foam profile control agent Table 2

[0020]

[0021] The experimental results show that the foaming volume of the system reaches 400mL when the oil saturation reaches 60% in the clean water configuration and the sewage configuration, and the foam half-life reaches 83h, which shows that the system is not affected by salinity and oil saturation and is stable. The foam stabilization effect of the agent is very good.

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Abstract

The invention discloses a carbon dioxide foam stabilizer suitable for low-permeability oil deposit, which is prepared from modified guargum, hydroxyethyl cellulose and lauryl alcohol, wherein the mass ratio of the modified guargum to the hydroxyethyl cellulose to the lauryl alcohol is 4 to 1 to 1. The invention is used for enhancing the stability of carbon dioxide foams, thereby the carbon dioxide foam stabilizer can plug a test well gas channeling passage, improve gas suction and a liquid generating section plane, reduce the gas-oil ratio, solve the problem of gas channeling emerged from low-permeability oil deposit gas injection development and provide technical support for the low permeable oil deposit gas injection development.

Description

Technical field: [0001] The invention relates to a foam stabilizer in the field of oil recovery, in particular to a carbon dioxide foam stabilizer suitable for low-permeability oil reservoirs. Background technique: [0002] In recent years, most of the newly added reserves in Daqing peripheral oilfields belong to low-permeability and sensitive reservoirs, and water injection development is difficult or has no economic benefits. With the continuous rise of international oil prices, the use of CO injection 2 The oil displacement method can obtain better development effect. But due to CO 2 The viscosity is small, and the fingering phenomenon is more likely to occur than water, and the gas channeling phenomenon is serious after long-term injection. This problem can be blocked by carbon dioxide foam. At present, conventional foam stabilizers are mainly polymers. The addition of polymers prolongs the half-life of foams to a certain extent, but the range is not ideal. At the sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/594C09K8/588
Inventor 刘合周万富刘向斌王海静韩重莲
Owner PETROCHINA CO LTD
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