Nitrogen-assisted microbial system as well as preparation method and application thereof

A technology of microorganisms and functional microorganisms, applied in chemical instruments and methods, mining fluids, earth drilling and production, etc., can solve problems such as injection pressure differences, foam system composition not proposed, injection volume can not be effectively controlled, etc., to achieve input-output ratio High, good oil-increasing effect, long-term effect

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technique does not address the composition of the foam system
At the same time, the surface foaming system and the single nitrogen injection method are adopted, mainly due to the great difference between the original formation pressure and the injection pressure of the reservoir, the injection volume cannot be effectively controlled

Method used

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  • Nitrogen-assisted microbial system as well as preparation method and application thereof
  • Nitrogen-assisted microbial system as well as preparation method and application thereof

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Effect test

preparation example Construction

[0026] According to the second aspect of the present invention, the present invention discloses a method for preparing the above-mentioned nitrogen-assisted microbial system. The specific steps of the method are as follows:

[0027] (1) Mixing functional microorganisms, biosurfactants and biopolymers uniformly to obtain a mixture of biological compound systems;

[0028] (2) Simultaneously inject the above-mentioned biological complex system mixture pressurized by the plunger pump and the nitrogen gas pressurized by the gas booster pump into the ground foaming equipment to form a nitrogen-assisted microbial system.

[0029] Preferably, the boost pressure of the biological compound system mixture is greater than 5 MPa, and the boost pressure of the gas booster pump is greater than 5 MPa.

[0030] Preferably, the pressure resistance value of the floor foaming equipment is greater than 6MPa, and the temperature resistance value is greater than 100°C.

[0031] According to the thi...

Embodiment 1

[0046] (1) uniformly mix Geobacillus, rhamnolipid and biological polysaccharide according to the mass ratio of 1:0.10:0.05 to obtain the mixture of biological compound system;

[0047] (2) The above-mentioned biological complex system mixture pressurized to 6.5MPa by the plunger pump and the nitrogen gas pressurized to 7.5MPa by the gas booster pump are simultaneously injected into the ground foaming equipment to form nitrogen-assisted microbial system A.

[0048] The liquid-to-gas volume ratio of the biological complex system to nitrogen is 1:2.

Embodiment 2

[0050] (1) uniformly mixing Bacillus paralicheniformis, rhamnolipid and xanthan gum according to the mass ratio of 1:0.15:0.07 to obtain the mixture of the biological compound system;

[0051] (2) Simultaneously inject the above biological complex system mixture pressurized to 7.0MPa by the plunger pump and nitrogen gas pressurized to 8.0MPa by the gas booster pump into the ground foaming equipment to form the nitrogen-assisted microbial system B.

[0052] The liquid-to-gas volume ratio of the biological complex system to nitrogen is 1:3.

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Abstract

The invention belongs to the technical field of microbial oil recovery, and particularly relates to a nitrogen-assisted microbial system as well as a preparation method and application thereof. The system is composed of a biological compound system and nitrogen, and the biological compound system is composed of functional microorganisms, a biological surfactant and a biopolymer. The preparation method comprises the following specific steps: uniformly mixing functional microorganisms, a biosurfactant and a biopolymer to obtain a mixture of a biological compound system; and injecting the biological compound system mixture pressurized by the plunger pump and nitrogen pressurized by the gas booster pump into ground foaming equipment at the same time to form a nitrogen-assisted microbial system. The method has the advantages of being long in field test validity period, good in oil increasing effect and high in input-output ratio, the validity period is longer than 12 months, the average daily oil increasing amount of a single well is larger than 5 t, and the input-output ratio is larger than 1: 5.

Description

technical field [0001] The invention belongs to the technical field of microbial oil recovery, and in particular relates to a nitrogen-assisted microbial system and its preparation method and application. Background technique [0002] The water-flooding oil production technique is generally adopted, and after decades of intensive production, most oil fields have entered the middle and late stages of production. At this time, the richness of the remaining oil in the near-wellbore area is obviously reduced, and it is in the form of sporadic bulk dispersion. Single well huff and puff is one of the important measures to increase production and improve quality and efficiency in oilfields. Microbial single well huff and puff mainly achieves the purpose of increasing single well productivity by squeezing specific microbial systems and nutrient systems from the oil well casing into the formation, and then through the growth and metabolism of microorganisms and their products acting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/594C09K8/582C09K8/584C09K8/588C09K8/94E21B43/16E21B43/22
CPCC09K8/594C09K8/582C09K8/584C09K8/588C09K8/94E21B43/166
Inventor 曹嫣镔宋欣曹功泽林军章张吉星刘涛孙刚正巴燕胡婧谭晓明
Owner CHINA PETROLEUM & CHEM CORP
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