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Slime reducing agent suitable for heavy oil wells with different mineralization and application

A slime reducing agent and salinity technology, applied in the direction of microorganism-based methods, bacteria, wellbore/well components, etc., can solve the problems of inability to guarantee reproduction, metabolic ability, reproduction, and metabolic ability decline, and the difficulty of microorganisms in surviving , to achieve the effect of environmental protection technology selection, reducing the viscosity of heavy oil, increasing production and high efficiency

Active Publication Date: 2014-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a limitation of the first method is that when the reservoir environment is usually harsh, microorganisms are not easy to survive, and the bacteria are greatly affected by high temperature and high salinity of formation water.
Even if the strain can survive, its reproductive and metabolic capabilities will be greatly reduced, that is, it cannot guarantee the reproductive and metabolic capabilities under any conditions within the suitable survival range, and then play the role of oil recovery

Method used

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  • Slime reducing agent suitable for heavy oil wells with different mineralization and application
  • Slime reducing agent suitable for heavy oil wells with different mineralization and application
  • Slime reducing agent suitable for heavy oil wells with different mineralization and application

Examples

Experimental program
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Effect test

Embodiment 1

[0038] In this example, the viscosity-reducing bacteria agent suitable for heavy oil wells with different salinities is composed of Bacillus licheniformis (CGMCC 1.807), Bacillus subtilis (CGMCC 1.215) and Bacillus thuringiensis (CGMCC 1.2736), and all three strains are purchased From the China General Microorganism Culture Collection Management Center (CGMCC), the bacterial agent is a solid dry powder, and the three bacteria are stored separately, all using skim milk as a protective agent and carrier, and the mass ratio of the three bacterial dry powders is 1:1:1.

[0039] This embodiment is suitable for the application of viscosities reducing agents in heavy oil wells with different salinities in oil recovery, including the following steps:

[0040] (1) Activate each strain separately until the cell concentration of each strain reaches 1.5~5.7×10 8 Each bacterial solution (2L) was mixed in equal volumes, and then the compound bacterial solution was added to the fermentation ...

Embodiment 2

[0046] In this example, the viscosity-reducing bacteria agent suitable for heavy oil wells with different salinities is composed of Bacillus licheniformis (CGMCC1.807), Bacillus subtilis (CGMCC1.215) and Bacillus thuringiensis (CGMCC1.2736), three strains The bacteria were purchased from the China General Microorganism Culture Collection Management Center (CGMCC). The bacteria agent was in liquid state and stored separately. 8 individual / mL.

[0047] This embodiment is suitable for the application of viscosities reducing agents in heavy oil wells with different salinities in oil recovery, including the following steps:

[0048] (1) Take the equal volumes of the various bacterial strains and mix them, transfer the compound bacterial liquid to the fermenter, add the fermentation medium at a volume ratio of 1:5, ferment and cultivate at 35°C for 72 hours, and control the pH value at 6~ 8. There is no need to pass oxygen or air during the fermentation process. After the fermentat...

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Abstract

The invention discloses a slime reducing agent suitable for heavy oil wells with different mineralization and an application, which belongs to the oil field chemical technology field. The slime reducing agent is composed of Bacillus licheniformis, bacillus subtilis and bacillus thuringiensis, and is cultured for 24 hours under the condition that the temperature is 30-70 DEG C, pH value is 5-10, mineralization is 1000-120000mg / L, and the pressure is 0-30MPa, thalline concentration of each bacterial classification can reach 108-109 / Ml, and the breeding capability is strong. The slime reducing agent can degrade the crude oil heavy components, metabolize a biological surface active agent and biogas, so that crude oil viscosity is reduced, and then stable yield increase of the heavy oil wells can be ensured. According to the test, good yield increase effect can be achieved at on-site oil well under the condition that mineralization is 6000-83000mg / L, pH value is 7-8.6, and the temperature is 40-60 DEG C, daily oil production is increased by 24-83%, pump efficiency is increased by 4-10%, the crude oil viscosity is decreased by 50-65%, output liquid surface tension is decreased by 20%-30%, and the crude oil condensation point is decreased to 1-3 DEG C.

Description

technical field [0001] The invention specifically relates to a slime reducing agent suitable for heavy oil wells with different salinity, and the application of the viscosity reducing agent, belonging to the technical field of oil field chemistry. Background technique [0002] Microbial oil recovery or enhanced oil recovery technology is to use microorganisms to grow, metabolize and act on oil reservoirs to enhance the fluidity of crude oil inside the oil reservoir or near the well, and to increase the crude oil production of a single well or block. Compared with chemical technology, microbial technology has the advantages of sustainability, high efficiency, and environmental protection. Therefore, at present, major domestic oil fields are conducting research and application of microbial oil recovery technology, and have achieved good oil-increasing effects. According to the composition of substances injected into the reservoir, microbial oil recovery technology is divided i...

Claims

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Application Information

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IPC IPC(8): C12N1/20C09K8/582E21B43/22C12R1/10C12R1/125C12R1/07
Inventor 苗建生郝春雷王剑常国栋王晓东李飞鹏
Owner CHINA PETROLEUM & CHEM CORP
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