Atomized liquid drop coalescence simulation method in whole shaft

A simulation method and technology in the wellbore, applied in design optimization/simulation, instrumentation, electrical digital data processing, etc., to achieve the effects of ensuring accuracy, improving calculation accuracy, and facilitating timely adjustment of the simulation range

Active Publication Date: 2021-07-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] At present, the research of most scholars mainly focuses on the stage of atomization and droplet injection, and there are few reports on the long-distance flow law and aggregation and fragmentation of atomized acid in the wellbore.

Method used

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  • Atomized liquid drop coalescence simulation method in whole shaft
  • Atomized liquid drop coalescence simulation method in whole shaft
  • Atomized liquid drop coalescence simulation method in whole shaft

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Embodiment 1

[0034] A method for merging and simulating atomized liquid droplets in a full wellbore, comprising the following steps:

[0035] S1: Through the atomization generator experiment, obtain the gas-liquid parameters corresponding to the optimal atomization rate under the experimental conditions, including the gas inlet flow rate v g , Liquid inlet velocity v l , gas-liquid volume ratio V, gas density ρ g , acid liquid density ρ l , gas viscosity μ g , acid viscosity μ l , injection pressure P 0 , inlet temperature T, droplet size D, surface tension σ. The parameters optimized by the experiment are used as the initial conditions of the numerical simulation, and the specific parameters are shown in Table 1.

[0036] Table 1 parameter setting table

[0037]

[0038]

[0039] S2: Based on the gas-liquid parameters in S1, the flow model and droplet size change model of the atomized acid in the wellbore are given; after the acid liquid and gas are atomized at the wellhead, ...

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Abstract

The invention relates to an atomized liquid drop coalescence simulation method in a whole shaft, and belongs to the technical field of shaft multiphase flow simulation, and the method comprises the following steps: S1, obtaining atomized acid flow initial parameters in the shaft based on an atomization generator experiment; S2, based on an Euler model and a group balance model, establishing a flow coalescence model of atomized acid in a shaft; S3, dividing the shaft into n sections, wherein the length of each section is b meters, and the width of each section is a meters, establishing a two-dimensional geometric model, encrypting grids near the shaft wall, inputting the initial parameters into the front b-meter shaft for calculation; S4, using a user-defined function to fit and compile the parameters of the outlet end of the first b meters, inputting the parameters into the b-2b well section, and extracting the parameters of the outlet end after calculation is completed; and S5, repeating the step S4 until the whole wellbore is calculated. The simulation of atomized acid flow coalescence in the whole shaft is completed through the steps S1 to S5, and the result is post-processed. The segmented continuous calculation method can simulate the particle size change and distribution state of liquid drops in a shaft of thousands of meters.

Description

technical field [0001] The invention relates to a method for merging and simulating atomized liquid droplets in a full wellbore, and belongs to the technical field of multiphase flow simulation in a wellbore. Background technique [0002] Fracture-vuggy reservoirs often develop many dissolved caves. When conventional acid is used for acidification, acid liquid will accumulate in large quantities, causing expansion of dissolved caves and termination of wormhole extension. This not only causes waste of acid liquid, but also makes it difficult to achieve the expected stimulation goals. As a new acidizing process, atomized acid penetrates the rock in the form of mist droplets after being injected into the formation, which can effectively communicate with discontinuous fracture-cavity reservoirs and avoid waste of acid solution. In order to achieve the acidizing effect, it is necessary to ensure that the atomized acid is in a state of gas-liquid dispersion at the bottom of the we...

Claims

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Application Information

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IPC IPC(8): G06F30/28G06F113/08G06F119/14
CPCG06F30/28G06F2113/08G06F2119/14
Inventor 齐宁杨潇苏徐航王一伟陈国彬韩子昭何龙王建海蒋平
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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