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A kind of sulfonated residual oil modified bentonite foam stabilizer and preparation method thereof

A technology of sulfonated residue and bentonite, which is applied in the field of sulfonated residue modified bentonite foam stabilizer and its preparation, can solve problems such as prominent plane and vertical conflicts, poor reservoir development effect, etc., and achieve suspension improvement, Good balance between hydrophilic and lipophilic, good compatibility

Active Publication Date: 2020-05-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most oil reservoirs in my country have entered the stage of high water-cut development, and the water cut continues to rise. Due to the influence of natural fractures and artificial fractures, water injection rushes in one direction along the fractures. The development effect is getting worse

Method used

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  • A kind of sulfonated residual oil modified bentonite foam stabilizer and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0041] This embodiment has prepared a kind of sulfonated residual oil modified bentonite foam stabilizer, and the preparation steps are:

[0042] (1) At room temperature, put residual oil and bentonite (sodium-based bentonite) with a mass ratio of 1:1 in a beaker, then add solvent dichloromethane (the mass ratio of dichloromethane and residual oil is 1:1) to carry out Stir for 1h to obtain a mixture;

[0043] (2) After the solvent in the mixture is volatilized, the bentonite coated with residual oil is obtained;

[0044] (3) A three-necked flask equipped with a stirrer, a thermometer and a dropping funnel is fixed in a constant temperature water bath, and the bentonite coated with residual oil is added to the three-necked flask;

[0045] (4) At 20°C, slowly add concentrated sulfuric acid (the mass ratio of residual oil to concentrated sulfuric acid is 1:1) from the dropping funnel, and control the dropping rate to 1 drop / s;

[0046] (5) Continue stirring reaction after dropw...

Embodiment 2

[0051] This embodiment has prepared a kind of sulfonated residual oil modified bentonite foam stabilizer, and the preparation steps are:

[0052](1) At room temperature, put residual oil and bentonite (sodium-based bentonite) with a mass ratio of 2:1 in a beaker, then add solvent chloroform (the mass ratio of chloroform and residual oil is 1.5:1) to carry out Stir for 1h to obtain a mixture;

[0053] (2) After the solvent in the mixture is volatilized, the bentonite coated with residual oil is obtained;

[0054] (3) A three-necked flask equipped with a stirrer, a thermometer and a dropping funnel is fixed in a constant temperature water bath, and the bentonite coated with residual oil is added to the three-necked flask;

[0055] (4) At 30°C, slowly add concentrated sulfuric acid (the mass ratio of residual oil to concentrated sulfuric acid is 3:1) from the dropping funnel, and control the dropping rate to 1 drop / s;

[0056] (5) Continue stirring reaction after dropwise addit...

Embodiment 3

[0061] This embodiment has prepared a kind of sulfonated residual oil modified bentonite foam stabilizer, and the preparation steps are:

[0062] (1) At room temperature, put residual oil and bentonite (sodium bentonite) with a mass ratio of 3:1 in a beaker, then add solvent ethanol (the mass ratio of ethanol to residual oil is 1:1) and stir for 1.5h, get the mixture;

[0063] (2) After the solvent in the mixture is volatilized, the bentonite coated with residual oil is obtained;

[0064] (3) A three-necked flask equipped with a stirrer, a thermometer and a dropping funnel is fixed in a constant temperature water bath, and the bentonite coated with residual oil is added to the three-necked flask;

[0065] (4) At 40°C, slowly add concentrated sulfuric acid (the mass ratio of residual oil to concentrated sulfuric acid is 3:1) from the dropping funnel, and control the dropping rate to 1 drop / s;

[0066] (5) continue stirring reaction after dropwise addition, stop stirring after...

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Abstract

The invention provides a sulfonated resid modified bentonite foam stabilizer and a preparation method thereof. The preparation method comprises the following steps: mixing bentonite with resid in an organic solvent under stirring, after completion of mixing, and carrying out evaporation to remove the organic solvent so as to obtain resid coated bentonite; and subjecting the resid coated bentoniteto sulfonation treatment so as to obtain the sulfonated resid modified bentonite foam stabilizer. The foam stabilizer prepared by using the preparation method provided by the invention solves the problems of precipitation in a foam-concentrate fluid, poor foaming ability and short foam stabilizing time for conventional bentonite particles; and the foam stabilizer has the characteristics of good foam stability, temperature resistance, salt resistance and good compatibility with formation water, and can be applied to foam flooding for improving the recovery efficiency of crude oil in high-water-cut reservoirs.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a sulfonated residual oil modified bentonite foam stabilizer and a preparation method thereof. Background technique [0002] At present, most oil reservoirs in my country have entered the stage of high water-cut development, and the water cut continues to rise. Due to the influence of natural fractures and artificial fractures, water injection rushes in one direction along the fractures. The development effect is getting worse and worse. Foam flooding is an tertiary oil recovery technology that uses foam as the oil displacement medium. It combines the characteristics of polymer flooding to increase the swept volume, surfactant flooding to improve oil washing efficiency, and gas flooding to have high fluidity. It is an effective replacement technology for greatly increasing oil recovery after flooding. Since the foam is a thermodynamically unstable syst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58
CPCC09K8/58
Inventor 罗文利党辉邹新源范伟周新宇常志东李文宏黄丽张永强罗幼松
Owner PETROCHINA CO LTD