Device and method for measuring fluid velocity slippage coefficient of seepage-free flow interface

Abstract

The invention relates to a device and method for measuring a fluid velocity slippage coefficient of a seepage-free flow interface. The device comprises a model housing, an artificial sandstone, a buffering partitioning plate, a water supply tank, a vacuum pump, a liquid trap, a camera, and a laser transmitter, wherein the artificial sandstone is disposed at the center of the interior of the model housing, the interior of the artificial sandstone is provided with a seepage channel, and a free flow channel is formed between the top of the artificial sandstone and a cavity of the model housing. The buffering partitioning plate achieves the buffering injection of fluid, and enables the injected fluid to move forwards uniformly. A laser Doppler speed measurer consists of the laser transmitter and a coordinate frame, and obtains the flow information of fluid in the free flow channel through laser detection. The device is simple in structure, is convenient to arrange, can precisely construct a speed slippage condition at a seepage-free flow coupling interface according to an experiment result, provides the technical basis and support for the coupling of the flowing of fluid in a pure fluid region and a porous dielectric region, and provides fundamental basis for the further flowing numerical simulation.

Description

technical field [0001] The invention belongs to the field of petroleum engineering, and in particular relates to a device and a method for measuring the fluid velocity slip coefficient at the seepage-free flow interface based on a laser Doppler velocimeter (LDA). Background technique [0002] Fracture-vuggy carbonate reservoirs have various types of storage space, large-scale caves, fractures, and bedrock pores coexist, and the range of scale changes is large, and the fluid flow in the reservoir is complex. The fluid flows freely, but in the bedrock and small-scale fractures, the fluid flows in the form of seepage, so this type of reservoir has the characteristics of seepage and free flow coupling. In the study of seepage-free flow coupling flow, it is found that the tangential component of the velocity in the free flow region on the interface is significantly larger than that in the porous medium region, so it is considered that the velocity is discontinuous at the macrosco...

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Problems solved by technology

However, limited by the experimental conditions at that time, it was impossible to measure the precise value of the fluid velocity on the interface

1997年,Advani[GupteS,AdvaniS.Flownearthepermeableboundaryofaporousmedium:AnexperimentalinvestigationusingLDA[J].Experimentsinfluids1997,22(5):408-422;GupteSK,AdvaniSG.Flownearthepermeableboundaryofanalignedfiberpreform:Anexperimentalinvestigationusinglaserdoppleranemometry[J].Polymercomposites1997,18(1):114-124]利用 Laser Doppler velocimetry (LDA) measured the slip velocity on the interface for the first time, but they did not conduct further research and calculation on the slip coefficient

Beavers[BeaversGS,SparrowEM,MagnusonRA.Experimentsoncoupledparallelflowsinachannelandaboundingporousmedium[J].JournalofBasicEngineering1970,92:843]、Richardson[RichardsonS.Amodelfortheboundaryconditionofaporousmaterial.Part2[J].JFluidMech1971,49(2):327-336]、Goyeau[GoyeauB,LhuillierD,GobinD ,VelardeM.Momentumtransportatafluid–porousinterface[J].InternationalJournalofHeatandMassTransfer2003,46(21):4071-4081] and others have done related research on how to determine the value of α, trying to establish a display expression, but so far there is no result, so the current value of α mainly rely on experiments to determine

[0004] The present invention determines the slip coefficient from an experimental point of view, which is more reliable and accurate, but there is no similar measurement experiment report in China at present

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