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Oil displacement method by injecting indigenous microorganism into sewage

A technology of original microorganisms and oil displacement method, which is applied in the field of oil displacement where sewage is injected into original microorganisms, can solve the problems of not maximizing the function of original microorganisms, few types of development, and decline in effect, so as to avoid strain variation and degradation, The effect of low cost and easy operation

Active Publication Date: 2007-07-11
PETROCHINA CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

In this method, because the bacteria come from outside the oil reservoir, the bacteria adapt to the reservoir conditions, natural variation, and the function of the bacteria over time, the effect is reduced, which is not only a worldwide problem, but also has not been solved. question
Although the original microbial oil recovery technology was developed earlier in Russia and other countries, due to the abundance of fresh water resources in these countries, the work is concentrated on fresh water injection reservoirs, and has not yet been carried out in sewage flooding reservoirs with almost zero dissolved oxygen content.
[0003] Some oilfields at home and abroad have applied or applied for patents for the technology of activating the original bacteria, but the culture system used is only the nitrogen source and phosphorus source of inorganic salts, or injecting syrup waste liquid, etc., and there is no development for the characteristics of the original bacteria. Low, the effect is good to activate the vegetative body of the original bacteria, and the effect of the original bacteria is not maximized

Method used

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  • Oil displacement method by injecting indigenous microorganism into sewage

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Firstly, investigate the microbes in the reservoir, and the quantity and metabolic performance of the microbes used in the survey should meet the requirements described in Table 1; secondly, within the range of geological parameters, the reservoir temperature should be less than 75°C, The optimal temperature range is 30-55°C; the salinity of the reservoir water is less than 50,000mg / L, and the hydrogen sulfide content in the reservoir water is less than 50mg / L; thirdly, according to the biochemical parameters of the microorganisms in the reservoir, determine the nutrients according to the amount of injected sewage The ratio is 0.45-1.40% for nitrogen source and phosphorus source, 0.1% for acetate and 0.01% for organic auxin yeast powder.

[0016] Air consumption is 10m per meter of oil layer 3 Air volume under standard conditions; Fourth, the replenishment of carbon sources depends on the remaining oil saturation of 1.5m near the reservoir water injection well being con...

Embodiment 2

[0021] The number of beneficial microorganisms in the sewage is lower than 10-10 3 pcs / mL, 8m flow back from the water injection well 3 liquid, and then take back effluent 5m 3 Fermented as a seed liquid at the temperature of the surface oil reservoir, the total amount of fermentation liquid is 6m 3 , ie 5m 3 seed liquid and 1m 3 Fermentation medium; fermentation medium by volume percentage 1m 3 Inorganic salt containing nitrogen and phosphorus is 0.2%, acetate is 0.3%, liquid paraffin is 1% and the rest is water; first, 1m 3 The prepared culture medium and fermenter were sterilized at 121°C for 30 minutes at 0.1MPa. When the temperature dropped to the oil reservoir temperature, the seed solution was added and fermented at the oil reservoir temperature. At the same time, the mixed solution was ventilated at 0.5m3 per minute. Ventilation, monitor the number of bacteria every 12 hours, until the number of bacteria reaches 3×10 8 per mL, the fermentation is over.

[0022] ...

Embodiment 3

[0024] Dagang Kongdian Oilfield was put into water injection development in February 1979. The reservoir of Guantao Formation is fluvial facies deposit with good reservoir physical properties (porosity 33%, permeability 1.878μm 2 ). The edge and bottom water in the oil field is developed, and about 40% of the wells have bottom water reservoirs. The underlying crude oil has a viscosity of 73mPa.s, a density of 0.9535, and an average water content of 94.4%. There is no replacement capacity. On the basis of analyzing reservoir conditions and biochemical parameters (Table 2), a scheme for periodically injecting aerated nutrient solution was formulated. The formula ratio of the nutrient solution was the same as in Example 1, and the carbon source was added. The method was the same as in Example 1, and the fermentation Original bacterium liquid, culture method is with embodiment 2.

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Abstract

The invention relates to an indigenous microorganism flooding method by injecting sewage for improving oil recovery. The well is selected, where the number of microorganism is not lower than 10-103 / mL; the methanogenic rate and the sulfate reduction rate satisfy demands of the lowest value of 0.2-3 mu gCH4 / L .D and the highest value of 15-20 mugCH4 / L .D; the temperature of sewage jetting oil reservoir with sulfate reduction bacteria, whose highest value is 103 / mL, is less than 30-75DEG C; water salinity in oil reservoir is less than 50000mg / L; the content of hydrogen sulfide in water of oil reservoir is less than 50mg / L in returned water of injecting water well and generated fluid in oil well. The concentration of nitrogen and phosphor in mixed air jetted in the injecting water well in period is 0.45-1. 40% nutrient solution. The concentration of dissolved oxygen added in sewage can achieve 2. 5-3. 5mg / L by fall oxygen method. Fermented fountainhead bacteria and the medium are supplied and the cell gross is improved. The carbon source is the crude oil under the ground or collected on the earth. Various microorganisms into oil reservoir by water injecting for a long time and applying the circumstance of oil reservoir are made use of to avoid the adaptable problem of microorganism and oil reservoir. The practical result shows it is the flooding technology, which can improve oil recovery and is provided with economy, effectivity and simple operation.

Description

technical field [0001] The invention relates to an oil displacement method in which the water injected during oil production is sewage discharged from crude oil wells, and the original microbes adapted to the oil reservoir environment can be brought into the oil reservoir in the water to enhance the oil recovery rate by injecting the original microbes into the sewage. technical background [0002] After flexible primary recovery and secondary oil recovery by water flooding, the oilfield has entered the stage of tertiary oil recovery using chemical agents. The tertiary oil recovery stage includes various chemical agents, chemical additives, thermal power and biotechnology oil recovery. Since Zobel, an American, applied for the first patent of microbial oil recovery technology in 1946, microbial oil recovery technology has been highly valued by the petroleum industry due to its low cost, easy operation, obvious effect and compliance with environmental protection requirements. ...

Claims

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Application Information

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IPC IPC(8): E21B43/22
Inventor 冯庆贤倪方天张淑琴王建强
Owner PETROCHINA CO LTD
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