Sand production experiment measuring device and sand production measuring method thereof

Abstract

The invention discloses a sand production experiment measuring device and a sand production measuring method.The core holder comprises a holder shell and a sleeve, a core is fixed to the inner side of the sleeve, a sealed annular cavity is formed between the periphery of the sleeve and the holder shell, and the annular cavity is communicated with a confining pressure applying pump; the clamp holder shell is provided with an air inlet and an air outlet which are communicated with the two ends of the sleeve respectively, the air inlet is sequentially and alternately communicated with a high-pressure air cylinder and a low-pressure air cylinder, the air outlet is communicated with a back-pressure valve used for adjusting displacement pressure difference, and the back-pressure valve is alternately communicated with a sand outlet pipeline and a gas flow meter. The sand outlet pipeline and the gas flow meter are respectively communicated with the high-pressure gas cylinder and the low-pressure gas cylinder, when the low-pressure gas drive is used for displacing the rock core, the gas pressure displacement basically has no influence on the sand outlet of the rock core, the pore of the rock core almost does not change any more, the rock core holder is connected to the low-pressure gas cylinder, the pressure difference is reduced, and the sand outlet of the rock core is ensured. The flow can reach the rated range of the gas flowmeter, and the accurate permeability is obtained.

Description

technical field [0001] The invention relates to the technical field of displacement experiments, in particular to a sand production experiment measurement device and a sand production measurement method thereof. Background technique [0002] In the process of gas reservoir development or injection and production of underground gas storage, sand production may occur in the reservoir, which will seriously affect the normal operation of production. In particular, the production mode of underground gas storage is special, which requires a large amount of gas to be injected and produced at a high speed in a short period of time. This requires that the gas storage must be developed safely, steadily and sustainably while meeting the seasonal emergency peak shaving. The production characteristics of gas storage will aggravate the risk of sand production in the reservoir. Efficient and long-term sand production prevention and control is an important technical guarantee for the long-t...

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Problems solved by technology

The patent document CN101915854A discloses a device and method for measuring the critical velocity of sand production in a gas well. The gas supply system provides different supply pressures for the simulation system simulating the production state of the gas well, and the inlet pressure, outlet pressure, gas flow rate and test are determined. The critical flow rate of sand production is obtained through the test results, and the critical flow rate of sand production is obtained in combination with the core size, thus forming a technology for determining the critical flow rate of sand production in field gas wells. However, the inlet pressure is always controlled by high pressure. When the core is displaced, in the process of measuring the flow rate, it is inevitable that the pressure will be too high, which will continue to affect the sand production, resulting in inaccurate gas flow measurement

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