Balancing device with automatic pressure regulation

Abstract

The invention provides an automatic adjusting pressure balance apparatus which relates to a testing machine for testing the diffusion factor of the rock of the nature gas. The apparatus comprises: a computer, an air release valve, a pressure balance buffer which is parallel connected with the gas pipe and a micro-differential pressure cell. The pressure balance buffer comprises a liquid storage, a media liquid, an S-type elastic balance sheet, a flange end cap and a cap bolt. The invention is used in oil gas geological exploration test.

Description

Technical field: [0001] The invention relates to an experimental device for measuring the diffusion coefficient of natural gas in rocks, in particular to a device for automatically adjusting gas pressure balance. Background technique: [0002] Diffusion of natural gas in the ground is a common phenomenon. It has been recognized that the diffusion of natural gas in sedimentary rocks is very important, and it is necessary to measure the diffusion coefficient of gas in sedimentary rocks. To measure the diffusion coefficient, it is necessary to create a concentration difference at both ends of the rock sample, and at the same time eliminate the pressure difference at both ends of the rock sample, so as to ensure that the measured diffusion result is produced by the concentration diffusion, rather than the permeation effect caused by the pressure difference. Therefore, there are special requirements for the experimental equipment. [0003] In the prior art, the foreign represent...

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Problems solved by technology

[0006] The device with this structure has the following disadvantages: firstly, the degree of automation of the device is low. In the actual operation process, especially in the process of simultaneous inflation and pressure of the diffusion chamber at both ends of the rock sample, it is easy to generate a large instantaneous pressure. Although it is manually adjusted in time, the instantaneous and manual adjustment process that produces a large pressure difference will inevitably produce a certain instantaneous pressure difference for some rock samples, especially for some muddy loose dry samples that cannot be saturated with water. Penetration, which affects the authenticity of the initial diffusion experiment and the accuracy of the experimental results

[0008] The pressure balance system of this structure also has the following disadvantages: the pressure balance of the inflation process at both ends depends on the compression of the arc surface of the balance sheet at one end, and the force is transmitted through the liquid 226, forcing the arc surface of the balance sheet at the other end to elongate, that is The compression of the arc surface of one end of the balance plate increases the inflated volume, and the elongation of the arc surface of the other end balance plate reduces the inflation volume to achieve pressure balance. However, in fact, the result of this “pressure balance” always has to overcome the tension of the balance plate. The internal force during the deformation process, and the "internal force" is the pressure difference between the two ends, that is

The pressure balance system of this structure is similar to the above, and there are also shortcomings: the inflation process at both ends is automatically adjusted by bellows 306 and 308, contact switches 309 and 310, liquid 307, and deflation solenoid valves 303 and 304 Balanced pressure at both ends, the maximum pressure difference can reach 7000Pa

[0013] Therefore, the pressure balance system with the above structure, in the initial stage of the diffusion experiment, due to the objective existence of a large pressure difference (including the momentary large pressure difference during the process of adjusting the vent valve), is more or less harmful to rock samples, especially for The loose dry sample will permeate with a slight pressure difference, which affects the authenticity of the diffusion experiment and the accuracy of the measurement results

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