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Microbial displaced fluid circulation and ground fermentation method and device

A microbial oil displacement and fluid production technology, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problem of supplementing nutrients and bacteria when nutrients are inappropriate, so as to reduce production costs and improve production efficiency. Bacterial concentration, easy operation and management

Active Publication Date: 2014-12-24
PETROCHINA CO LTD
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  • Description
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AI Technical Summary

Problems solved by technology

Although sewage reinjection can reinject the beneficial bacteria and residual nutrients produced into the formation, it is difficult to effectively replenish the microbial field in the formation due to the continuous consumption of nutrients and rely solely on sewage reinjection to supplement nutrients and bacteria in time. Proliferation, thereby interacting with crude oil to enhance oil recovery
Relying on the previous microflooding method to directly supplement nutrients to the formation, although the concentration of bacteria in the oil reservoir can be maintained, it is difficult to make the concentration of bacteria break through 10 6 pcs / ml

Method used

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  • Microbial displaced fluid circulation and ground fermentation method and device
  • Microbial displaced fluid circulation and ground fermentation method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The volume of the liquid distribution tank in the process flow is 25m 3 , the motor connected to the agitator in each liquid distribution tank is a three-phase asynchronous motor; the water control valve is a flange medium pressure valve with a nominal diameter of 50mm; the flowmeter adopts an electromagnetic flowmeter with a range of 0.125 to 6000m 3 / h; the pipeline is a PVC pipeline, with an inner diameter of 50mm, a back wall of 5mm, and a pressure of 5MPa;

[0030] The incoming water for microbial flooding and dispensing comes out of the sewage storage tank 17, passes through the main liquid inlet valve 1.9 and the liquid inlet pump 4.3 along the liquid distribution water pipeline 12, and enters the liquid distribution tank A2 through the water control valve A1.1 and the water control valve B1.2 .1 and dosing pool B2.2, according to the concentration of added nutrient solution, configure nutrient solution in dosing pool A2.1 and dosing pool B2.2; stir evenly with a...

Embodiment 2

[0032] Example 2 Microbial flooding production fluid circulation and surface fermentation method

[0033] Taking Baolige oilfield sewage reinjection system as an example, the oil well output fluid in this oilfield is separated from oil and water in the three-line separator, the dehydrated crude oil is exported, and the sewage is passed through the sewage settling tank, the secondary settling tank, the buffer tank, and the filtration tank. tank, secondary filter tank, and sewage storage tank to remove residual oil and suspended matter and reinject into the two fault blocks of the oil field. The whole sewage treatment time is 8-12h, the main residence time is in the sewage settling tank, and the treatment temperature is 45℃~50℃.

[0034] Before the implementation, the device process (embodiment 1) designed by the present invention is installed in parallel on the sewage treatment process of the combined station:

[0035] Liquid distribution system: liquid distribution pool volum...

Embodiment 3

[0047] Embodiment 3 indoor physical model experiment:

[0048] Artificial quartz sand filled core Φ2.5×100cm (core permeability 43.5×10 -3 μm 2 , porosity 31.8%, displacement pressure: 0.2~5.8MPa, displacement speed: 0.2ml / min).

[0049] The first is to establish a microbial field. After the oil-saturated core is cultivated in a 58°C constant temperature box for water flooding (formation water) to 85% water content, the bacterial solution and nutrient solution are injected to carry out microbial oil displacement, and the output is detected during the microbial displacement process. The bacterial concentration of the liquid and the change data of the recovery factor were collected, and the microbial flooding was stopped until the bacterial concentration of the produced liquid was stable, and the microbial field had been established in the formation at this time.

[0050] Secondly, carry out the simulation experiment of the surface fermentation process of microbial output liqu...

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Abstract

The invention relates to a microbial displaced fluid circulation and ground fermentation method and device. According to the method, foul water and nutrient are mixed in a preparation pool; prepared nutrient liquid is delivered to a fermentation tank in which produced liquid is stored; the nutrient in the fermentation tank quickly activates an effective microbial community in the produced liquid; fermentation liquor from the fermentation tank enters a secondary settling tank to settle at the temperature of 45 DEG C to 50 DEG C for 1-2h, and bacteria continue to grow and breed under such conditions; the fermentation liquor in the secondary settling tank is filtered by a primary filter and a secondary filter to remove residual oil in reinjection water; the fermentation liquor enters a foul water tank and is stored at the temperature of 40 DEG C to 45 DEG C for 1-2h; the fermentation liquor is injected into fault block wells. The method has the advantages that the effective microbial community in the produced fluid is activated, the concentration of bacteria is increased by 2-3 levels, growth of harmful microbial communities is inhibited, and viscosity of the crude oil is decreased by 31.9% under the microbial action.

Description

technical field [0001] The invention relates to a method for circulation and surface fermentation of microbial oil displacement output fluid and a device for circulation and fermentation. Background technique [0002] Microbial oil recovery technology is one of the technical means for tertiary oil recovery in domestic oilfields. The prerequisite for implementing microbial oil recovery is to establish a stable microbial field inside the oil reservoir. To keep microorganisms stable in the formation, they must be provided with sufficient growth space and nutrients. Domestic oilfield reservoir conditions generally use single well huff and puff or microbial flooding to directly inject nutrients and bacterial liquid into the formation to ensure the activity of the bacterial group, so that the concentration of bacterial cells in the reservoir formation is maintained at 10 5 ~10 6 A / ml or so. [0003] A stable microbial field has been established in each fault block reservoir of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22E21B43/40
Inventor 任付平吴刚游靖韩长胜裴亚托余吉良郑雅
Owner PETROCHINA CO LTD
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