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Atomized acid shaft flow simulation platform for gas injection development of fracture-cavity type oil reservoir and working method thereof

A flow simulation, fracture-cavity type technology, applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problem of the effective action distance of acid fluid that affects the geometric size of wormholes, fluid rheology and acid rock reaction rate , affect the effective wormhole action distance and other issues, achieve excellent anti-clogging performance, good atomization effect, and improve the effect of atomization effect

Active Publication Date: 2020-04-17
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature change will inevitably affect the rheology of the liquid and the reaction rate of the acid rock, and finally affect the geometric size of the wormhole, the effective action distance of the acid solution, etc., thereby affecting the acidification effect
In addition, during the conventional acidification and acid injection construction, the construction friction is relatively high, which requires high construction equipment, which limits the construction displacement and affects the effective distance of worm holes

Method used

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  • Atomized acid shaft flow simulation platform for gas injection development of fracture-cavity type oil reservoir and working method thereof
  • Atomized acid shaft flow simulation platform for gas injection development of fracture-cavity type oil reservoir and working method thereof
  • Atomized acid shaft flow simulation platform for gas injection development of fracture-cavity type oil reservoir and working method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] An acid atomization-wellbore flow simulation platform for deep acidification of fracture-cavity reservoirs, such as figure 1 As shown, it includes gas system, liquid system, atomization generator, simulated wellbore flow device and acid atomization evaluation device.

[0043] The air circuit system includes an air compressor 1, an air throttle valve 2, and a gas pressure gauge 3. The air compressor provides gas with adjustable injection speed for the atomization generating device. The air throttle valve is used to control the gas injection speed, and the gas pressure gauge is used for Measure gas injection pressure.

[0044] The liquid system includes a high-pressure acid-resistant pump 4, a liquid pressure gauge 5, and a liquid throttle valve 6. The high-pressure acid-resistant pump provides acid liquid with adjustable injection speed for the double-flow Venturi atomization generator, and the liquid pressure gauge is used to measure the liquid injection pressure. , Th...

Embodiment 2

[0049] Set the initial gas flow rate to 1.0m 3 / h, the initial fluid injection rate is 40mL / min, by changing the gas-liquid ratio under different conditions, the atomization rate under this condition is calculated as shown in Table 1 below.

[0050] Table 1 Initial Experimental Data Recording Form

[0051]

[0052]

[0053] Use serial number 1 as the experimental control group, control variables, and change the liquid flow rate and gas flow rate respectively. Through the comparison of serial numbers 1, 4, and 7, it is found that when the liquid flow rate is kept constant at 40mL / min, the gas flow rate is changed to 0.5m 3 / min, 1m 3 / min, 2m 3 / min, with the increase of liquid-gas ratio, the atomization rate increased from 4.00% to 33.33%.

[0054] The atomization effect of the double-flow Venturi atomization generating device described in Table 1 is relatively low. Therefore, through the atomization principle of the Venturi tube, the atomization rate of the atomiza...

Embodiment 3

[0063] From Example 1, it can be seen that the atomization rate can be increased by changing the cross-sectional area of ​​acid liquid injection, but at the same time, the pressure of the acid liquid injection port is increased, which is likely to cause damage to the equipment. Therefore, the atomization rate cannot be improved only by reducing the cross-sectional area of ​​the acid liquid injection, but other methods should be selected to improve the atomization generating device. Embodiment 3 adopts a narrower and longer Venturi pipe, redesigns the acid liquid injection port, and improves the atomizing nozzle.

[0064] The improved double-flow Venturi atomization generating device is 120mm high, the gas inlet is 40mm high, the inner diameter is 20mm, the outer diameter is 32mm, the liquid inlet diameter is 8mm, the liquid outlet diameter is 0.5mm, and the total cross-sectional area is 1.57mm 2 , The length of the atomizing nozzle of the double-flow outlet is 53mm, and the in...

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Abstract

The invention discloses an atomized acid shaft flow simulation platform for gas injection development of a fracture-cavity type oil reservoir. The atomized acid shaft flow simulation platform mainly comprises a double-flow venturi atomization generation device, a shaft flow simulation device and an atomization evaluation device. The atomization generation device comprises an air path system, a liquid path system and an atomization generator; the airpath system comprises an air compressor, an air throttle valve and an air pressure gauge; the liquid path system comprises a high-pressure acid-proof pump, a liquid throttle valve and a liquid pressure gauge; the simulation wellbore is used for being connected with the double-flow venturi atomization generation device and comprises a vertical wellbore, a horizontal simulation stratum and an effusion collecting device. The observation system comprises a nano laser particle size analyzer. The invention also discloses a working method of the atomized acid shaft flow simulation platform for gas injection development of the fracture-cavity type oil reservoir. The simulation platform can be applied to an oil field site, the injection displacement is controlled through the air path system and the liquid path system, the high acid liquor atomization rate is kept according to site construction requirements, the acidification effect of the fracture-cavity type oil reservoir is improved and effective communication of the fracture-cavity type storage and collection unit bodies can be realized.

Description

technical field [0001] The invention relates to an atomized acid wellbore flow simulation device and a working method for gas injection to develop fracture-cavity oil reservoirs, and belongs to the technical field of oil and gas reservoir production enhancement measures. Background technique [0002] Acidizing can effectively remove the pollution and clogging of the reservoir near the wellbore, improve the connectivity between the wellbore and the reservoir, and restore or increase oil and gas production. It is the main technical measure for the development of low porosity and low permeability carbonate reservoirs today. In acidizing, according to different corrosion forms, the results of acid corrosion can be divided into surface corrosion, wormhole corrosion and uniform corrosion. The main factor affecting the dissolution morphology of carbonate rocks during the acidification process is H + Mass transfer velocity and surface reaction velocity. When the mass transfer rate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/27E21B43/16E21B47/00E21B49/00
CPCE21B43/26E21B43/168E21B47/00E21B49/00E21B49/008
Inventor 齐宁王一伟何龙苏徐航赵海洋王建海徐志鹏李艺恬杨潇韩子昭
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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