Critical liquid-carrying flow calculation method considering droplet deformation and multi-parameter influence

Abstract

The invention relates to a critical liquid-carrying flow calculation method considering droplet deformation and multi-parameter influence in the field of reasonable production allocation of gas reservoirs. The method solves the problem of deviation existing in judgment of gas well effusion at present, and mainly comprises the following steps: solving the maximum size parameter of ellipsoidal liquid drops based on the liquid drop breaking principle; based on the balance of gravity, a drag force and buoyancy borne by the liquid drops, acquiring a critical liquid-carrying flow velocity expression; considering the influence of the change of the incident flow area of the liquid drops due to deformation on drag coefficients and the influence of different pressures, temperatures and pipe diameters on parameters such as gas-liquid two-phase friction resistance, gas-liquid surface tension and the like, and establishing a critical liquid-carrying flow calculation model considering multiple parameters; and finally, solving the model by adopting a multi-parameter iteration mode to obtain the critical liquid-carrying flow of the gas well. The method has the advantages that the gas well effusionis accurately predicted, the influence of multiple parameters on the critical liquid carrying flow is considered, calculation is accurate, and use is convenient.

Description

technical field [0001] The patent of the present invention relates to a calculation method of critical liquid-carrying flow considering the influence of droplet deformation and multi-parameters, which belongs to the field of reasonable production allocation of gas reservoirs. Background technique [0002] Since most gas fields adopt depletion mining, as the production progresses, the formation energy decreases, which is not enough to bring out all the liquid produced in the wellbore, and the liquid accumulates at the bottom of the well, creating back pressure on the formation, further reducing the effective liquid-carrying energy. In severe cases, it may even cause well killing or gas well shutdown, which is the phenomenon of liquid accumulation in gas wells. Therefore, based on the principle of liquid carrying in gas wells, it is of great significance to study the calculation of critical liquid carrying flow rate, provide reference for reasonable production allocation of ga...

AI Technical Summary

Problems solved by technology

[0003] Nowadays, in the calculation of this flow rate, the key parameters of drag coefficient, friction coefficient and surface tension are all fixed values, but in practical applications, the well conditions are complex, and when the wellhead temperature, pressure and well diameter change, the calculation critical The key parameters of the liquid-carrying flow will change and are no longer fixed values

As a result, the critical liquid-carrying flow calculated by using a fixed value cannot accurately reflect the ability of the gas well to carry liquid normally, and there is a deviation in the judgment of the liquid accumulation in the gas well

This patent is to solve the problem that the deviation of the critical flow rate in the calculation of the current critical liquid-carrying flow rate cannot accurately judge the liquid accumulation situation of the gas well, so as to adapt to the gas wells with different production conditions, droplet deformation, drag coefficient, friction coefficient and surface tension. It will change with the change of temperature, pressure and tubing diameter, more accurately calculate the critical liquid-carrying flow rate of the gas well, and guide the reasonable production ratio of the gas well

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