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Microbial enhanced oil recovery method

A microbial oil recovery and microbial technology, which is applied in chemical instruments and methods, production fluids, earthwork drilling, etc., can solve the problems of large adsorption loss of chemical agents, high cost, increased dissolution and injection equipment, etc., to improve the oil displacement effect. Effect

Inactive Publication Date: 2015-09-30
HAIMEN MINGYANG IND
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Problems solved by technology

At present, there is no patent report on the structural slug design of the microbial solution in the process of microbial injection into the reservoir when the microbial oil recovery field is applied; USP5163510 proposes the injection of H 2 o 2 , NaClO 3 , KClO 4 , NaNO 3 A method to increase the concentration of dissolved oxygen in reservoir water, but there are unfavorable factors such as high cost, special dissolution and injection equipment must be added, the compatibility of chemical agents and reservoir fluids must be ensured, and the adsorption loss of reservoir rocks to chemical agents is large.

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0018] The technical solutions of the present invention will be described in further detail below in conjunction with specific embodiments.

[0019] Inject the nutrient solution from the microbial injection well to the oil-bearing rock formation in a slug manner, with a volume concentration of 4%-10%, and a volume concentration of 20-30% of the total microbial solution volume. %-6%, the amount is 50-70% of the total microbial solution volume, the main body slug microbial solution and air, the volume concentration is 4%-8%, the volume concentration is 10-20% of the total microbial solution volume, the rear tail slug Microbial solution and air, close the microbial injection well for at least 3 days, preferably 3-15 days, then open the well to inject nutrient solution and water, and obtain crude oil (the concentration of microbial fermentation liquid is calculated as 100%) in the beneficial oil recovery well.

[0020] Wherein: the nutrient solution contains nutrients such as yeas...

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Abstract

The invention discloses a microbial enhanced oil recovery method. The method mainly includes the steps that microbes are injected into a well, a microbial solution with an oxygen source is injected into a petroliferous bed, then water is injected, crude oil is obtained through a beneficial production well, the microbial solution with the oxygen source is injected in a slug mode, a microbe injection well is closed for at least two days after the microbe solution is injected, then the well is opened and water is injected, and crude oil is obtained through the beneficial production well. The microbes are aerobic and / or facultative anaerobic bacteria. The activity of the microbes injected in an oil reservoir reaches a high level, performance of the microbes is played to the largest extent, and the oil displacement effect of the microbes is improved.

Description

technical field [0001] The invention relates to an improved method for microbial oil recovery. Background technique [0002] Research on microbial oil recovery began in the 1920s. Its main mechanism is to use microorganisms to degrade crude oil in oil reservoirs to reduce crude oil viscosity and improve crude oil fluidity; metabolize biosurfactants and organic solvents to improve oil washing efficiency; Medium growth, stripping oil film and other effects to improve oil recovery. Microbial oil recovery method is especially suitable for later oil recovery in oil fields. Due to the low cost, wide application range and simple construction, this technology has attracted great attention from the petroleum industry. [0003] The main factors affecting the effect of microbial oil recovery in microbial oil recovery include: the injection method of microorganisms, the supplement of nutrients and oxygen, and the control of microbial fermentation time in the reservoir. At present, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/582
Inventor 施勇
Owner HAIMEN MINGYANG IND
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