A microbial composite movable gel for oil field displacement and its preparation method and application

A technology for gelation and oil displacement, which is applied in chemical instruments and methods, earth-moving drilling, and drilling compositions, etc., can solve the problems of large amount of cross-linking agent used, large microbial influence, environmental pollution, etc., and achieves increased spread The effect of volume, good gelation and low usage

Active Publication Date: 2022-05-20
陕西中诺油气科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the chemical substance polyacrylamide is mostly used as the polymer in the movable gel, but it has problems such as salt sensitivity, chemical degradation, poor temperature resistance, easy formation of micelles to block the formation, and environmental pollution.
Although there are mobile gels based on biopolysaccharides in the prior art, and biopolysaccharides are xanthan gum, gellan gum, konjac gum, locust bean gum, tara gum, tapioca flour, and gum arabic, but in the formation of mobile gels At the same time, the amount of cross-linking agent used is large, and the current cross-linking agent mostly uses formaldehyde, glyoxal, Cr 3+ 、Ti 3+ 、Zr 4+ etc. These cross-linking agents not only damage the environment, but also a large amount of cross-linking agents have a greater impact on microorganisms

Method used

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  • A microbial composite movable gel for oil field displacement and its preparation method and application
  • A microbial composite movable gel for oil field displacement and its preparation method and application
  • A microbial composite movable gel for oil field displacement and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A movable gel for microbial gel composite flooding, the movable gel is made of the following raw materials in mass percentage:

[0058] Welan gum 0.25%;

[0059] Chitosan 0.05%;

[0060] Alginic acid 0.05%;

[0061] Borax 0.01%;

[0062] Acetic acid 0.025%;

[0063] Chromium acetate 0.075%;

[0064] The remainder is water.

[0065] Preparation methods, including:

[0066] At room temperature, disperse Welan gum and alginic acid in a part of water, and fully expand to obtain a mixed solution 1;

[0067] At room temperature, disperse chitosan and acetic acid in a part of water, fully dissolve to obtain mixed solution 2;

[0068] At room temperature, borax and chromium acetate were dispersed in the remaining water to obtain a mixed solution 3;

[0069] Fully mix the mixed solution 1, the mixed solution 2 and the mixed solution 3 to obtain a movable gel for oil displacement.

Embodiment 2

[0071] A movable gel for microbial gel composite flooding, the movable gel is made of the following raw materials in mass percentage:

[0072] Welan gum 0.4%;

[0073] Chitosan 0.06%;

[0074] Alginic acid 0.06%;

[0075] Borax 0.02%;

[0076] Acetic acid 0.03%;

[0077] Chromium acetate 0.04%;

[0078] The remainder is water.

[0079] The preparation method is the same as in Example 1.

Embodiment 3

[0081] A movable gel for microbial gel composite flooding, the movable gel is made of the following raw materials in mass percentage:

[0082] Welan gum 0.3%;

[0083] Chitosan 0.07%;

[0084] Alginic acid 0.07%;

[0085] Borax 0.04%;

[0086] Acetic acid 0.04%;

[0087] Chromium acetate 0.08%;

[0088] The remainder is water.

[0089] The preparation method is the same as in Example 1.

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Abstract

The invention relates to a movable gel for oil field microbial composite flooding and its preparation method and application. The movable gel is made of the following raw materials in mass percentage: 0.1% to 0.5% of Welan gum; 0.01% to chitosan 0.1%; alginic acid 0.01-0.1%; borax 0.01-0.05%; acetic acid 0.015-0.05%; cross-linking agent 0.05-0.1%; the rest is water. The cross-linking agent used in the movable gel of the present invention is low, can effectively reduce the impact on microorganisms and the environment, and has excellent coexistence between colloid and bacterial liquid, and has little viscosity loss when left for a long time at a certain concentration.

Description

technical field [0001] The invention relates to a microbial composite movable gel for oil flooding in an oil field, a preparation method and application thereof, and belongs to the technical field of oil field tertiary oil recovery. Background technique [0002] The information disclosed in this background section is only intended to increase some understanding of the general background of the present invention, and is not necessarily to be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Microbial oil recovery technology is to inject microorganisms and their nutrient sources into underground oil reservoir formations, so that microorganisms can live and reproduce in the oil layers. On the one hand, the direct effect of microorganisms on crude oil is used to improve the physical properties of crude oil and increase the fluidity of crude oil in formation pores. On the one ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C09K8/90E21B43/22C08J3/075C08L5/00C08L5/08C08L5/04C08K13/02C08K3/38C08K5/09C08K5/098
CPCC09K8/588C09K8/905C08J3/075E21B43/16C08J2305/00C08J2405/04C08J2405/08C08K13/02C08K2003/387C08K5/09C08K5/098Y02A20/204
Inventor 魏战胜胥中义王军初立国李志伟陈世栋王磊
Owner 陕西中诺油气科技有限公司
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