Diffusion coefficient analyzer

Abstract

The present invention provides a diffusion coefficient measuring instrument, in the concrete, it relates to a device for measuring rock diffusion coefficient. Said measuring instrument includes rock sample diffusion device, pressure balance device, pressure pump and vacuum pump. Said rock sample diffusion device, includes core chamber, rock sample sealing cover, diffusion chamber, plunger, plunger-pulling bar, end cover, regulating screw rod and fixing frame. Besides, said invention also provides the working principle of said diffusion coefficient measuring instrument.

Description

Technical field: [0001] The invention relates to an experimental device in oil and gas exploration, in particular to a device for measuring the rock diffusion coefficient. Background technique: [0002] The diffusion of natural gas underground is a common phenomenon. People have realized that the diffusion effect of natural gas in sedimentary rocks is very important. For oil and gas exploration, it is necessary to determine the diffusion coefficient of hydrocarbon gases in sedimentary rocks. To determine the diffusion coefficient, it is necessary to create a concentration difference between the two ends of the rock sample, and eliminate the pressure difference between the two ends of the rock sample to ensure that the measured diffusion result is caused by concentration diffusion, rather than the permeability caused by the pressure difference. Therefore, a special experimental device is required. [0003] In the prior art, the most representative and well-reported diffusion exper...

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Problems solved by technology

[0005] Although the measuring device of this structure is simple in structure and convenient to detect gas samples, the key core holder in the device has disadvantages: the core holder of this structure, after loading the rock sample saturated with water, In the process of vacuuming the diffusion chamber at both ends of the rock sample, the saturated water in the pores of the rock sample will be lost by at least 30%, even as much as 80%, which is very unfavorable for the diffusion experiment to simulate the formation conditions

The core device of these two technologies, the core holder, is like the patent No. 94224552.0. At the beginning of the experiment, the saturated water in the pores of the rock sample is seriously lost during the simultaneous vacuuming of the two diffusion chambers from both ends of the core holder.

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