Microbial composite mobile gel for oil displacement of oil field as well as preparation method and application thereof

Abstract

The invention relates to mobile gel for oil field microorganism composite oil displacement as well as a preparation method and application of the mobile gel. The mobile gel is prepared from the following raw materials in percentage by mass: 0.1-0.5% of welan gum and the balance of water. 0.01 to 0.1 percent of chitosan; 0.01 to 0.1 percent of alginic acid; 0.01 to 0.05 percent of borax; 0.015%-0.05% of acetic acid; 0.05%-0.1% of a cross-linking agent; remaining water. The use amount of the cross-linking agent in the mobile gel is low, the influence on microorganisms and the environment can beeffectively reduced, the coexistence of the colloid and the bacterial liquid is excellent, and the viscosity loss is small after the mobile gel is placed 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 ...

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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

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