An Experimental Study on Improving the Liquid-carrying Capacity of Wellbore Gas by a Multi-stage Orifice

doi:10.11885/j.issn.1674-5086.2018.07.24.01

Abstract

Abstract: Liquid accumulation in the bottom hole of gas wells will affect the production process and lead to production stoppage in severe cases. Measures currently taken to drain bottom liquid include the adding of foaming agent, replacement of smalldiameter tubing, and nitrogen lift. These measures are play an important role in gas well production, but the wellbore structure that causes liquid backflow has not changed. Changing the conventional wellbore structure to suit for single-phase fluids could help reduce the backflow of liquid in a wellbore of gas-liquid two-phase flow and improve the liquid-carrying capacity. We propose a wellbore structure suitable for gas-liquid two-phase flow that has practical significance for improving gas well production. We design a multi-stage orifice device similar to the inverted funnel that is installed in the wellbore tube. Bottom hole gas is used as the kinetic energy. The orifice plate is designed to reduce or prevent liquid backflow so that the liquid passes through the multi-stage orifice plate and rises sequentially. A gas compressor is used to provide a gas source, and the effect of the addition of the orifice on the gas and foam carrying capacity at different gas flow rates is tested. When the multi-stage orifice device is added into the tube, it greatly improves the gas carrying capacity and the liquid discharging effect of the tube. It also reduces the liquid backflow and the critical value of the gas flow rate in the gas and foam drainage. The experiment proves that the method and principle of multi-stage orifice plate for gas well stimulation works well, improving the gas carrying capacity and the liquid-carrying effect of the foam as well as reducing the amount of foaming agent and residual liquid in the bottom hole.

Key words: drainage gas recovery, orifice-type gas-liquid atomization device, liquid-carrying capability, drainage velocity, foam drainage

CLC Number:

TE377

WANG Qiwei. An Experimental Study on Improving the Liquid-carrying Capacity of Wellbore Gas by a Multi-stage Orifice[J]. 西南石油大学学报(自然科学版), 2020, 42(1): 78-83.

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